Merge branch 'xuqianlin' of https://bdgit.educoder.net/poz2c78vw/read into xuqianlin

src/net/micode/notes/data/Contact.java

@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.data;
+
+import android.content.Context;
+import android.database.Cursor;
+import android.provider.ContactsContract.CommonDataKinds.Phone;
+import android.provider.ContactsContract.Data;
+import android.telephony.PhoneNumberUtils;
+import android.util.Log;
+
+import java.util.HashMap;
+
+public class Contact {
+    private static HashMap<String, String> sContactCache;
+    private static final String TAG = "Contact";
+
+    private static final String CALLER_ID_SELECTION = "PHONE_NUMBERS_EQUAL(" + Phone.NUMBER
+    + ",?) AND " + Data.MIMETYPE + "='" + Phone.CONTENT_ITEM_TYPE + "'"
+    + " AND " + Data.RAW_CONTACT_ID + " IN "
+            + "(SELECT raw_contact_id "
+            + " FROM phone_lookup"
+            + " WHERE min_match = '+')";
+
+    public static String getContact(Context context, String phoneNumber) {
+        if(sContactCache == null) {
+            sContactCache = new HashMap<String, String>();
+        }
+
+        if(sContactCache.containsKey(phoneNumber)) {
+            return sContactCache.get(phoneNumber);
+        }
+
+        String selection = CALLER_ID_SELECTION.replace("+",
+                PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));
+        Cursor cursor = context.getContentResolver().query(
+                Data.CONTENT_URI,
+                new String [] { Phone.DISPLAY_NAME },
+                selection,
+                new String[] { phoneNumber },
+                null);
+
+        if (cursor != null && cursor.moveToFirst()) {
+            try {
+                String name = cursor.getString(0);
+                sContactCache.put(phoneNumber, name);
+                return name;
+            } catch (IndexOutOfBoundsException e) {
+                Log.e(TAG, " Cursor get string error " + e.toString());
+                return null;
+            } finally {
+                cursor.close();
+            }
+        } else {
+            Log.d(TAG, "No contact matched with number:" + phoneNumber);
+            return null;
+        }
+    }
+}

src/net/micode/notes/data/Notes.java

@@ -0,0 +1,279 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.data;
+
+import android.net.Uri;
+public class Notes {
+    public static final String AUTHORITY = "micode_notes";
+    public static final String TAG = "Notes";
+    public static final int TYPE_NOTE     = 0;
+    public static final int TYPE_FOLDER   = 1;
+    public static final int TYPE_SYSTEM   = 2;
+
+    /**
+     * Following IDs are system folders' identifiers
+     * {@link Notes#ID_ROOT_FOLDER } is default folder
+     * {@link Notes#ID_TEMPARAY_FOLDER } is for notes belonging no folder
+     * {@link Notes#ID_CALL_RECORD_FOLDER} is to store call records
+     */
+    public static final int ID_ROOT_FOLDER = 0;
+    public static final int ID_TEMPARAY_FOLDER = -1;
+    public static final int ID_CALL_RECORD_FOLDER = -2;
+    public static final int ID_TRASH_FOLER = -3;
+
+    public static final String INTENT_EXTRA_ALERT_DATE = "net.micode.notes.alert_date";
+    public static final String INTENT_EXTRA_BACKGROUND_ID = "net.micode.notes.background_color_id";
+    public static final String INTENT_EXTRA_WIDGET_ID = "net.micode.notes.widget_id";
+    public static final String INTENT_EXTRA_WIDGET_TYPE = "net.micode.notes.widget_type";
+    public static final String INTENT_EXTRA_FOLDER_ID = "net.micode.notes.folder_id";
+    public static final String INTENT_EXTRA_CALL_DATE = "net.micode.notes.call_date";
+
+    public static final int TYPE_WIDGET_INVALIDE      = -1;
+    public static final int TYPE_WIDGET_2X            = 0;
+    public static final int TYPE_WIDGET_4X            = 1;
+
+    public static class DataConstants {
+        public static final String NOTE = TextNote.CONTENT_ITEM_TYPE;
+        public static final String CALL_NOTE = CallNote.CONTENT_ITEM_TYPE;
+    }
+
+    /**
+     * Uri to query all notes and folders
+     */
+    public static final Uri CONTENT_NOTE_URI = Uri.parse("content://" + AUTHORITY + "/note");
+
+    /**
+     * Uri to query data
+     */
+    public static final Uri CONTENT_DATA_URI = Uri.parse("content://" + AUTHORITY + "/data");
+
+    public interface NoteColumns {
+        /**
+         * The unique ID for a row
+         * <P> Type: INTEGER (long) </P>
+         */
+        public static final String ID = "_id";
+
+        /**
+         * The parent's id for note or folder
+         * <P> Type: INTEGER (long) </P>
+         */
+        public static final String PARENT_ID = "parent_id";
+
+        /**
+         * Created data for note or folder
+         * <P> Type: INTEGER (long) </P>
+         */
+        public static final String CREATED_DATE = "created_date";
+
+        /**
+         * Latest modified date
+         * <P> Type: INTEGER (long) </P>
+         */
+        public static final String MODIFIED_DATE = "modified_date";
+
+
+        /**
+         * Alert date
+         * <P> Type: INTEGER (long) </P>
+         */
+        public static final String ALERTED_DATE = "alert_date";
+
+        /**
+         * Folder's name or text content of note
+         * <P> Type: TEXT </P>
+         */
+        public static final String SNIPPET = "snippet";
+
+        /**
+         * Note's widget id
+         * <P> Type: INTEGER (long) </P>
+         */
+        public static final String WIDGET_ID = "widget_id";
+
+        /**
+         * Note's widget type
+         * <P> Type: INTEGER (long) </P>
+         */
+        public static final String WIDGET_TYPE = "widget_type";
+
+        /**
+         * Note's background color's id
+         * <P> Type: INTEGER (long) </P>
+         */
+        public static final String BG_COLOR_ID = "bg_color_id";
+
+        /**
+         * For text note, it doesn't has attachment, for multi-media
+         * note, it has at least one attachment
+         * <P> Type: INTEGER </P>
+         */
+        public static final String HAS_ATTACHMENT = "has_attachment";
+
+        /**
+         * Folder's count of notes
+         * <P> Type: INTEGER (long) </P>
+         */
+        public static final String NOTES_COUNT = "notes_count";
+
+        /**
+         * The file type: folder or note
+         * <P> Type: INTEGER </P>
+         */
+        public static final String TYPE = "type";
+
+        /**
+         * The last sync id
+         * <P> Type: INTEGER (long) </P>
+         */
+        public static final String SYNC_ID = "sync_id";
+
+        /**
+         * Sign to indicate local modified or not
+         * <P> Type: INTEGER </P>
+         */
+        public static final String LOCAL_MODIFIED = "local_modified";
+
+        /**
+         * Original parent id before moving into temporary folder
+         * <P> Type : INTEGER </P>
+         */
+        public static final String ORIGIN_PARENT_ID = "origin_parent_id";
+
+        /**
+         * The gtask id
+         * <P> Type : TEXT </P>
+         */
+        public static final String GTASK_ID = "gtask_id";
+
+        /**
+         * The version code
+         * <P> Type : INTEGER (long) </P>
+         */
+        public static final String VERSION = "version";
+    }
+
+    public interface DataColumns {
+        /**
+         * The unique ID for a row
+         * <P> Type: INTEGER (long) </P>
+         */
+        public static final String ID = "_id";
+
+        /**
+         * The MIME type of the item represented by this row.
+         * <P> Type: Text </P>
+         */
+        public static final String MIME_TYPE = "mime_type";
+
+        /**
+         * The reference id to note that this data belongs to
+         * <P> Type: INTEGER (long) </P>
+         */
+        public static final String NOTE_ID = "note_id";
+
+        /**
+         * Created data for note or folder
+         * <P> Type: INTEGER (long) </P>
+         */
+        public static final String CREATED_DATE = "created_date";
+
+        /**
+         * Latest modified date
+         * <P> Type: INTEGER (long) </P>
+         */
+        public static final String MODIFIED_DATE = "modified_date";
+
+        /**
+         * Data's content
+         * <P> Type: TEXT </P>
+         */
+        public static final String CONTENT = "content";
+
+
+        /**
+         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
+         * integer data type
+         * <P> Type: INTEGER </P>
+         */
+        public static final String DATA1 = "data1";
+
+        /**
+         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
+         * integer data type
+         * <P> Type: INTEGER </P>
+         */
+        public static final String DATA2 = "data2";
+
+        /**
+         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
+         * TEXT data type
+         * <P> Type: TEXT </P>
+         */
+        public static final String DATA3 = "data3";
+
+        /**
+         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
+         * TEXT data type
+         * <P> Type: TEXT </P>
+         */
+        public static final String DATA4 = "data4";
+
+        /**
+         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
+         * TEXT data type
+         * <P> Type: TEXT </P>
+         */
+        public static final String DATA5 = "data5";
+    }
+
+    public static final class TextNote implements DataColumns {
+        /**
+         * Mode to indicate the text in check list mode or not
+         * <P> Type: Integer 1:check list mode 0: normal mode </P>
+         */
+        public static final String MODE = DATA1;
+
+        public static final int MODE_CHECK_LIST = 1;
+
+        public static final String CONTENT_TYPE = "vnd.android.cursor.dir/text_note";
+
+        public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/text_note";
+
+        public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/text_note");
+    }
+
+    public static final class CallNote implements DataColumns {
+        /**
+         * Call date for this record
+         * <P> Type: INTEGER (long) </P>
+         */
+        public static final String CALL_DATE = DATA1;
+
+        /**
+         * Phone number for this record
+         * <P> Type: TEXT </P>
+         */
+        public static final String PHONE_NUMBER = DATA3;
+
+        public static final String CONTENT_TYPE = "vnd.android.cursor.dir/call_note";
+
+        public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/call_note";
+
+        public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/call_note");
+    }
+}

src/net/micode/notes/data/NotesDatabaseHelper.java

@@ -0,0 +1,362 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.data;
+
+import android.content.ContentValues;
+import android.content.Context;
+import android.database.sqlite.SQLiteDatabase;
+import android.database.sqlite.SQLiteOpenHelper;
+import android.util.Log;
+
+import net.micode.notes.data.Notes.DataColumns;
+import net.micode.notes.data.Notes.DataConstants;
+import net.micode.notes.data.Notes.NoteColumns;
+
+
+public class NotesDatabaseHelper extends SQLiteOpenHelper {
+    private static final String DB_NAME = "note.db";
+
+    private static final int DB_VERSION = 4;
+
+    public interface TABLE {
+        public static final String NOTE = "note";
+
+        public static final String DATA = "data";
+    }
+
+    private static final String TAG = "NotesDatabaseHelper";
+
+    private static NotesDatabaseHelper mInstance;
+
+    private static final String CREATE_NOTE_TABLE_SQL =
+        "CREATE TABLE " + TABLE.NOTE + "(" +
+            NoteColumns.ID + " INTEGER PRIMARY KEY," +
+            NoteColumns.PARENT_ID + " INTEGER NOT NULL DEFAULT 0," +
+            NoteColumns.ALERTED_DATE + " INTEGER NOT NULL DEFAULT 0," +
+            NoteColumns.BG_COLOR_ID + " INTEGER NOT NULL DEFAULT 0," +
+            NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
+            NoteColumns.HAS_ATTACHMENT + " INTEGER NOT NULL DEFAULT 0," +
+            NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
+            NoteColumns.NOTES_COUNT + " INTEGER NOT NULL DEFAULT 0," +
+            NoteColumns.SNIPPET + " TEXT NOT NULL DEFAULT ''," +
+            NoteColumns.TYPE + " INTEGER NOT NULL DEFAULT 0," +
+            NoteColumns.WIDGET_ID + " INTEGER NOT NULL DEFAULT 0," +
+            NoteColumns.WIDGET_TYPE + " INTEGER NOT NULL DEFAULT -1," +
+            NoteColumns.SYNC_ID + " INTEGER NOT NULL DEFAULT 0," +
+            NoteColumns.LOCAL_MODIFIED + " INTEGER NOT NULL DEFAULT 0," +
+            NoteColumns.ORIGIN_PARENT_ID + " INTEGER NOT NULL DEFAULT 0," +
+            NoteColumns.GTASK_ID + " TEXT NOT NULL DEFAULT ''," +
+            NoteColumns.VERSION + " INTEGER NOT NULL DEFAULT 0" +
+        ")";
+
+    private static final String CREATE_DATA_TABLE_SQL =
+        "CREATE TABLE " + TABLE.DATA + "(" +
+            DataColumns.ID + " INTEGER PRIMARY KEY," +
+            DataColumns.MIME_TYPE + " TEXT NOT NULL," +
+            DataColumns.NOTE_ID + " INTEGER NOT NULL DEFAULT 0," +
+            NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
+            NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
+            DataColumns.CONTENT + " TEXT NOT NULL DEFAULT ''," +
+            DataColumns.DATA1 + " INTEGER," +
+            DataColumns.DATA2 + " INTEGER," +
+            DataColumns.DATA3 + " TEXT NOT NULL DEFAULT ''," +
+            DataColumns.DATA4 + " TEXT NOT NULL DEFAULT ''," +
+            DataColumns.DATA5 + " TEXT NOT NULL DEFAULT ''" +
+        ")";
+
+    private static final String CREATE_DATA_NOTE_ID_INDEX_SQL =
+        "CREATE INDEX IF NOT EXISTS note_id_index ON " +
+        TABLE.DATA + "(" + DataColumns.NOTE_ID + ");";
+
+    /**
+     * Increase folder's note count when move note to the folder
+     */
+    private static final String NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER =
+        "CREATE TRIGGER increase_folder_count_on_update "+
+        " AFTER UPDATE OF " + NoteColumns.PARENT_ID + " ON " + TABLE.NOTE +
+        " BEGIN " +
+        "  UPDATE " + TABLE.NOTE +
+        "   SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" +
+        "  WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" +
+        " END";
+
+    /**
+     * Decrease folder's note count when move note from folder
+     */
+    private static final String NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER =
+        "CREATE TRIGGER decrease_folder_count_on_update " +
+        " AFTER UPDATE OF " + NoteColumns.PARENT_ID + " ON " + TABLE.NOTE +
+        " BEGIN " +
+        "  UPDATE " + TABLE.NOTE +
+        "   SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" +
+        "  WHERE " + NoteColumns.ID + "=old." + NoteColumns.PARENT_ID +
+        "  AND " + NoteColumns.NOTES_COUNT + ">0" + ";" +
+        " END";
+
+    /**
+     * Increase folder's note count when insert new note to the folder
+     */
+    private static final String NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER =
+        "CREATE TRIGGER increase_folder_count_on_insert " +
+        " AFTER INSERT ON " + TABLE.NOTE +
+        " BEGIN " +
+        "  UPDATE " + TABLE.NOTE +
+        "   SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" +
+        "  WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" +
+        " END";
+
+    /**
+     * Decrease folder's note count when delete note from the folder
+     */
+    private static final String NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER =
+        "CREATE TRIGGER decrease_folder_count_on_delete " +
+        " AFTER DELETE ON " + TABLE.NOTE +
+        " BEGIN " +
+        "  UPDATE " + TABLE.NOTE +
+        "   SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" +
+        "  WHERE " + NoteColumns.ID + "=old." + NoteColumns.PARENT_ID +
+        "  AND " + NoteColumns.NOTES_COUNT + ">0;" +
+        " END";
+
+    /**
+     * Update note's content when insert data with type {@link DataConstants#NOTE}
+     */
+    private static final String DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER =
+        "CREATE TRIGGER update_note_content_on_insert " +
+        " AFTER INSERT ON " + TABLE.DATA +
+        " WHEN new." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" +
+        " BEGIN" +
+        "  UPDATE " + TABLE.NOTE +
+        "   SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT +
+        "  WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" +
+        " END";
+
+    /**
+     * Update note's content when data with {@link DataConstants#NOTE} type has changed
+     */
+    private static final String DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER =
+        "CREATE TRIGGER update_note_content_on_update " +
+        " AFTER UPDATE ON " + TABLE.DATA +
+        " WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" +
+        " BEGIN" +
+        "  UPDATE " + TABLE.NOTE +
+        "   SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT +
+        "  WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" +
+        " END";
+
+    /**
+     * Update note's content when data with {@link DataConstants#NOTE} type has deleted
+     */
+    private static final String DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER =
+        "CREATE TRIGGER update_note_content_on_delete " +
+        " AFTER delete ON " + TABLE.DATA +
+        " WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" +
+        " BEGIN" +
+        "  UPDATE " + TABLE.NOTE +
+        "   SET " + NoteColumns.SNIPPET + "=''" +
+        "  WHERE " + NoteColumns.ID + "=old." + DataColumns.NOTE_ID + ";" +
+        " END";
+
+    /**
+     * Delete datas belong to note which has been deleted
+     */
+    private static final String NOTE_DELETE_DATA_ON_DELETE_TRIGGER =
+        "CREATE TRIGGER delete_data_on_delete " +
+        " AFTER DELETE ON " + TABLE.NOTE +
+        " BEGIN" +
+        "  DELETE FROM " + TABLE.DATA +
+        "   WHERE " + DataColumns.NOTE_ID + "=old." + NoteColumns.ID + ";" +
+        " END";
+
+    /**
+     * Delete notes belong to folder which has been deleted
+     */
+    private static final String FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER =
+        "CREATE TRIGGER folder_delete_notes_on_delete " +
+        " AFTER DELETE ON " + TABLE.NOTE +
+        " BEGIN" +
+        "  DELETE FROM " + TABLE.NOTE +
+        "   WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" +
+        " END";
+
+    /**
+     * Move notes belong to folder which has been moved to trash folder
+     */
+    private static final String FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER =
+        "CREATE TRIGGER folder_move_notes_on_trash " +
+        " AFTER UPDATE ON " + TABLE.NOTE +
+        " WHEN new." + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER +
+        " BEGIN" +
+        "  UPDATE " + TABLE.NOTE +
+        "   SET " + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER +
+        "  WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" +
+        " END";
+
+    public NotesDatabaseHelper(Context context) {
+        super(context, DB_NAME, null, DB_VERSION);
+    }
+
+    public void createNoteTable(SQLiteDatabase db) {
+        db.execSQL(CREATE_NOTE_TABLE_SQL);
+        reCreateNoteTableTriggers(db);
+        createSystemFolder(db);
+        Log.d(TAG, "note table has been created");
+    }
+
+    private void reCreateNoteTableTriggers(SQLiteDatabase db) {
+        db.execSQL("DROP TRIGGER IF EXISTS increase_folder_count_on_update");
+        db.execSQL("DROP TRIGGER IF EXISTS decrease_folder_count_on_update");
+        db.execSQL("DROP TRIGGER IF EXISTS decrease_folder_count_on_delete");
+        db.execSQL("DROP TRIGGER IF EXISTS delete_data_on_delete");
+        db.execSQL("DROP TRIGGER IF EXISTS increase_folder_count_on_insert");
+        db.execSQL("DROP TRIGGER IF EXISTS folder_delete_notes_on_delete");
+        db.execSQL("DROP TRIGGER IF EXISTS folder_move_notes_on_trash");
+
+        db.execSQL(NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER);
+        db.execSQL(NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER);
+        db.execSQL(NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER);
+        db.execSQL(NOTE_DELETE_DATA_ON_DELETE_TRIGGER);
+        db.execSQL(NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER);
+        db.execSQL(FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER);
+        db.execSQL(FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER);
+    }
+
+    private void createSystemFolder(SQLiteDatabase db) {
+        ContentValues values = new ContentValues();
+
+        /**
+         * call record foler for call notes
+         */
+        values.put(NoteColumns.ID, Notes.ID_CALL_RECORD_FOLDER);
+        values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
+        db.insert(TABLE.NOTE, null, values);
+
+        /**
+         * root folder which is default folder
+         */
+        values.clear();
+        values.put(NoteColumns.ID, Notes.ID_ROOT_FOLDER);
+        values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
+        db.insert(TABLE.NOTE, null, values);
+
+        /**
+         * temporary folder which is used for moving note
+         */
+        values.clear();
+        values.put(NoteColumns.ID, Notes.ID_TEMPARAY_FOLDER);
+        values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
+        db.insert(TABLE.NOTE, null, values);
+
+        /**
+         * create trash folder
+         */
+        values.clear();
+        values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);
+        values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
+        db.insert(TABLE.NOTE, null, values);
+    }
+
+    public void createDataTable(SQLiteDatabase db) {
+        db.execSQL(CREATE_DATA_TABLE_SQL);
+        reCreateDataTableTriggers(db);
+        db.execSQL(CREATE_DATA_NOTE_ID_INDEX_SQL);
+        Log.d(TAG, "data table has been created");
+    }
+
+    private void reCreateDataTableTriggers(SQLiteDatabase db) {
+        db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_insert");
+        db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_update");
+        db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_delete");
+
+        db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER);
+        db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER);
+        db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER);
+    }
+
+    static synchronized NotesDatabaseHelper getInstance(Context context) {
+        if (mInstance == null) {
+            mInstance = new NotesDatabaseHelper(context);
+        }
+        return mInstance;
+    }
+
+    @Override
+    public void onCreate(SQLiteDatabase db) {
+        createNoteTable(db);
+        createDataTable(db);
+    }
+
+    @Override
+    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
+        boolean reCreateTriggers = false;
+        boolean skipV2 = false;
+
+        if (oldVersion == 1) {
+            upgradeToV2(db);
+            skipV2 = true; // this upgrade including the upgrade from v2 to v3
+            oldVersion++;
+        }
+
+        if (oldVersion == 2 && !skipV2) {
+            upgradeToV3(db);
+            reCreateTriggers = true;
+            oldVersion++;
+        }
+
+        if (oldVersion == 3) {
+            upgradeToV4(db);
+            oldVersion++;
+        }
+
+        if (reCreateTriggers) {
+            reCreateNoteTableTriggers(db);
+            reCreateDataTableTriggers(db);
+        }
+
+        if (oldVersion != newVersion) {
+            throw new IllegalStateException("Upgrade notes database to version " + newVersion
+                    + "fails");
+        }
+    }
+
+    private void upgradeToV2(SQLiteDatabase db) {
+        db.execSQL("DROP TABLE IF EXISTS " + TABLE.NOTE);
+        db.execSQL("DROP TABLE IF EXISTS " + TABLE.DATA);
+        createNoteTable(db);
+        createDataTable(db);
+    }
+
+    private void upgradeToV3(SQLiteDatabase db) {
+        // drop unused triggers
+        db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_insert");
+        db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_delete");
+        db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_update");
+        // add a column for gtask id
+        db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.GTASK_ID
+                + " TEXT NOT NULL DEFAULT ''");
+        // add a trash system folder
+        ContentValues values = new ContentValues();
+        values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);
+        values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
+        db.insert(TABLE.NOTE, null, values);
+    }
+
+    private void upgradeToV4(SQLiteDatabase db) {
+        db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.VERSION
+                + " INTEGER NOT NULL DEFAULT 0");
+    }
+}

src/net/micode/notes/data/NotesProvider.java

@@ -0,0 +1,305 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.data;
+
+
+import android.app.SearchManager;
+import android.content.ContentProvider;
+import android.content.ContentUris;
+import android.content.ContentValues;
+import android.content.Intent;
+import android.content.UriMatcher;
+import android.database.Cursor;
+import android.database.sqlite.SQLiteDatabase;
+import android.net.Uri;
+import android.text.TextUtils;
+import android.util.Log;
+
+import net.micode.notes.R;
+import net.micode.notes.data.Notes.DataColumns;
+import net.micode.notes.data.Notes.NoteColumns;
+import net.micode.notes.data.NotesDatabaseHelper.TABLE;
+
+
+public class NotesProvider extends ContentProvider {
+    private static final UriMatcher mMatcher;
+
+    private NotesDatabaseHelper mHelper;
+
+    private static final String TAG = "NotesProvider";
+
+    private static final int URI_NOTE            = 1;
+    private static final int URI_NOTE_ITEM       = 2;
+    private static final int URI_DATA            = 3;
+    private static final int URI_DATA_ITEM       = 4;
+
+    private static final int URI_SEARCH          = 5;
+    private static final int URI_SEARCH_SUGGEST  = 6;
+
+    static {
+        mMatcher = new UriMatcher(UriMatcher.NO_MATCH);
+        mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE);
+        mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM);
+        mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA);
+        mMatcher.addURI(Notes.AUTHORITY, "data/#", URI_DATA_ITEM);
+        mMatcher.addURI(Notes.AUTHORITY, "search", URI_SEARCH);
+        mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY, URI_SEARCH_SUGGEST);
+        mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY + "/*", URI_SEARCH_SUGGEST);
+    }
+
+    /**
+     * x'0A' represents the '\n' character in sqlite. For title and content in the search result,
+     * we will trim '\n' and white space in order to show more information.
+     */
+    private static final String NOTES_SEARCH_PROJECTION = NoteColumns.ID + ","
+        + NoteColumns.ID + " AS " + SearchManager.SUGGEST_COLUMN_INTENT_EXTRA_DATA + ","
+        + "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_1 + ","
+        + "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_2 + ","
+        + R.drawable.search_result + " AS " + SearchManager.SUGGEST_COLUMN_ICON_1 + ","
+        + "'" + Intent.ACTION_VIEW + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_ACTION + ","
+        + "'" + Notes.TextNote.CONTENT_TYPE + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_DATA;
+
+    private static String NOTES_SNIPPET_SEARCH_QUERY = "SELECT " + NOTES_SEARCH_PROJECTION
+        + " FROM " + TABLE.NOTE
+        + " WHERE " + NoteColumns.SNIPPET + " LIKE ?"
+        + " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER
+        + " AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE;
+
+    @Override
+    public boolean onCreate() {
+        mHelper = NotesDatabaseHelper.getInstance(getContext());
+        return true;
+    }
+
+    @Override
+    public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
+            String sortOrder) {
+        Cursor c = null;
+        SQLiteDatabase db = mHelper.getReadableDatabase();
+        String id = null;
+        switch (mMatcher.match(uri)) {
+            case URI_NOTE:
+                c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null,
+                        sortOrder);
+                break;
+            case URI_NOTE_ITEM:
+                id = uri.getPathSegments().get(1);
+                c = db.query(TABLE.NOTE, projection, NoteColumns.ID + "=" + id
+                        + parseSelection(selection), selectionArgs, null, null, sortOrder);
+                break;
+            case URI_DATA:
+                c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null,
+                        sortOrder);
+                break;
+            case URI_DATA_ITEM:
+                id = uri.getPathSegments().get(1);
+                c = db.query(TABLE.DATA, projection, DataColumns.ID + "=" + id
+                        + parseSelection(selection), selectionArgs, null, null, sortOrder);
+                break;
+            case URI_SEARCH:
+            case URI_SEARCH_SUGGEST:
+                if (sortOrder != null || projection != null) {
+                    throw new IllegalArgumentException(
+                            "do not specify sortOrder, selection, selectionArgs, or projection" + "with this query");
+                }
+
+                String searchString = null;
+                if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) {
+                    if (uri.getPathSegments().size() > 1) {
+                        searchString = uri.getPathSegments().get(1);
+                    }
+                } else {
+                    searchString = uri.getQueryParameter("pattern");
+                }
+
+                if (TextUtils.isEmpty(searchString)) {
+                    return null;
+                }
+
+                try {
+                    searchString = String.format("%%%s%%", searchString);
+                    c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY,
+                            new String[] { searchString });
+                } catch (IllegalStateException ex) {
+                    Log.e(TAG, "got exception: " + ex.toString());
+                }
+                break;
+            default:
+                throw new IllegalArgumentException("Unknown URI " + uri);
+        }
+        if (c != null) {
+            c.setNotificationUri(getContext().getContentResolver(), uri);
+        }
+        return c;
+    }
+
+    @Override
+    public Uri insert(Uri uri, ContentValues values) {
+        SQLiteDatabase db = mHelper.getWritableDatabase();
+        long dataId = 0, noteId = 0, insertedId = 0;
+        switch (mMatcher.match(uri)) {
+            case URI_NOTE:
+                insertedId = noteId = db.insert(TABLE.NOTE, null, values);
+                break;
+            case URI_DATA:
+                if (values.containsKey(DataColumns.NOTE_ID)) {
+                    noteId = values.getAsLong(DataColumns.NOTE_ID);
+                } else {
+                    Log.d(TAG, "Wrong data format without note id:" + values.toString());
+                }
+                insertedId = dataId = db.insert(TABLE.DATA, null, values);
+                break;
+            default:
+                throw new IllegalArgumentException("Unknown URI " + uri);
+        }
+        // Notify the note uri
+        if (noteId > 0) {
+            getContext().getContentResolver().notifyChange(
+                    ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null);
+        }
+
+        // Notify the data uri
+        if (dataId > 0) {
+            getContext().getContentResolver().notifyChange(
+                    ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null);
+        }
+
+        return ContentUris.withAppendedId(uri, insertedId);
+    }
+
+    @Override
+    public int delete(Uri uri, String selection, String[] selectionArgs) {
+        int count = 0;
+        String id = null;
+        SQLiteDatabase db = mHelper.getWritableDatabase();
+        boolean deleteData = false;
+        switch (mMatcher.match(uri)) {
+            case URI_NOTE:
+                selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 ";
+                count = db.delete(TABLE.NOTE, selection, selectionArgs);
+                break;
+            case URI_NOTE_ITEM:
+                id = uri.getPathSegments().get(1);
+                /**
+                 * ID that smaller than 0 is system folder which is not allowed to
+                 * trash
+                 */
+                long noteId = Long.valueOf(id);
+                if (noteId <= 0) {
+                    break;
+                }
+                count = db.delete(TABLE.NOTE,
+                        NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
+                break;
+            case URI_DATA:
+                count = db.delete(TABLE.DATA, selection, selectionArgs);
+                deleteData = true;
+                break;
+            case URI_DATA_ITEM:
+                id = uri.getPathSegments().get(1);
+                count = db.delete(TABLE.DATA,
+                        DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
+                deleteData = true;
+                break;
+            default:
+                throw new IllegalArgumentException("Unknown URI " + uri);
+        }
+        if (count > 0) {
+            if (deleteData) {
+                getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
+            }
+            getContext().getContentResolver().notifyChange(uri, null);
+        }
+        return count;
+    }
+
+    @Override
+    public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
+        int count = 0;
+        String id = null;
+        SQLiteDatabase db = mHelper.getWritableDatabase();
+        boolean updateData = false;
+        switch (mMatcher.match(uri)) {
+            case URI_NOTE:
+                increaseNoteVersion(-1, selection, selectionArgs);
+                count = db.update(TABLE.NOTE, values, selection, selectionArgs);
+                break;
+            case URI_NOTE_ITEM:
+                id = uri.getPathSegments().get(1);
+                increaseNoteVersion(Long.valueOf(id), selection, selectionArgs);
+                count = db.update(TABLE.NOTE, values, NoteColumns.ID + "=" + id
+                        + parseSelection(selection), selectionArgs);
+                break;
+            case URI_DATA:
+                count = db.update(TABLE.DATA, values, selection, selectionArgs);
+                updateData = true;
+                break;
+            case URI_DATA_ITEM:
+                id = uri.getPathSegments().get(1);
+                count = db.update(TABLE.DATA, values, DataColumns.ID + "=" + id
+                        + parseSelection(selection), selectionArgs);
+                updateData = true;
+                break;
+            default:
+                throw new IllegalArgumentException("Unknown URI " + uri);
+        }
+
+        if (count > 0) {
+            if (updateData) {
+                getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
+            }
+            getContext().getContentResolver().notifyChange(uri, null);
+        }
+        return count;
+    }
+
+    private String parseSelection(String selection) {
+        return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : "");
+    }
+
+    private void increaseNoteVersion(long id, String selection, String[] selectionArgs) {
+        StringBuilder sql = new StringBuilder(120);
+        sql.append("UPDATE ");
+        sql.append(TABLE.NOTE);
+        sql.append(" SET ");
+        sql.append(NoteColumns.VERSION);
+        sql.append("=" + NoteColumns.VERSION + "+1 ");
+
+        if (id > 0 || !TextUtils.isEmpty(selection)) {
+            sql.append(" WHERE ");
+        }
+        if (id > 0) {
+            sql.append(NoteColumns.ID + "=" + String.valueOf(id));
+        }
+        if (!TextUtils.isEmpty(selection)) {
+            String selectString = id > 0 ? parseSelection(selection) : selection;
+            for (String args : selectionArgs) {
+                selectString = selectString.replaceFirst("\\?", args);
+            }
+            sql.append(selectString);
+        }
+
+        mHelper.getWritableDatabase().execSQL(sql.toString());
+    }
+
+    @Override
+    public String getType(Uri uri) {
+        // TODO Auto-generated method stub
+        return null;
+    }
+
+}

src/net/micode/notes/gtask/data/MetaData.java

@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.gtask.data;
+
+import android.database.Cursor;
+import android.util.Log;
+
+import net.micode.notes.tool.GTaskStringUtils;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+
+
+public class MetaData extends Task {
+    private final static String TAG = MetaData.class.getSimpleName();
+
+    private String mRelatedGid = null;
+
+    public void setMeta(String gid, JSONObject metaInfo) {
+        try {
+            metaInfo.put(GTaskStringUtils.META_HEAD_GTASK_ID, gid);
+        } catch (JSONException e) {
+            Log.e(TAG, "failed to put related gid");
+        }
+        setNotes(metaInfo.toString());
+        setName(GTaskStringUtils.META_NOTE_NAME);
+    }
+
+    public String getRelatedGid() {
+        return mRelatedGid;
+    }
+
+    @Override
+    public boolean isWorthSaving() {
+        return getNotes() != null;
+    }
+
+    @Override
+    public void setContentByRemoteJSON(JSONObject js) {
+        super.setContentByRemoteJSON(js);
+        if (getNotes() != null) {
+            try {
+                JSONObject metaInfo = new JSONObject(getNotes().trim());
+                mRelatedGid = metaInfo.getString(GTaskStringUtils.META_HEAD_GTASK_ID);
+            } catch (JSONException e) {
+                Log.w(TAG, "failed to get related gid");
+                mRelatedGid = null;
+            }
+        }
+    }
+
+    @Override
+    public void setContentByLocalJSON(JSONObject js) {
+        // this function should not be called
+        throw new IllegalAccessError("MetaData:setContentByLocalJSON should not be called");
+    }
+
+    @Override
+    public JSONObject getLocalJSONFromContent() {
+        throw new IllegalAccessError("MetaData:getLocalJSONFromContent should not be called");
+    }
+
+    @Override
+    public int getSyncAction(Cursor c) {
+        throw new IllegalAccessError("MetaData:getSyncAction should not be called");
+    }
+
+}

src/net/micode/notes/gtask/data/Node.java

@@ -0,0 +1,101 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.gtask.data;
+
+import android.database.Cursor;
+
+import org.json.JSONObject;
+
+public abstract class Node {
+    public static final int SYNC_ACTION_NONE = 0;
+
+    public static final int SYNC_ACTION_ADD_REMOTE = 1;
+
+    public static final int SYNC_ACTION_ADD_LOCAL = 2;
+
+    public static final int SYNC_ACTION_DEL_REMOTE = 3;
+
+    public static final int SYNC_ACTION_DEL_LOCAL = 4;
+
+    public static final int SYNC_ACTION_UPDATE_REMOTE = 5;
+
+    public static final int SYNC_ACTION_UPDATE_LOCAL = 6;
+
+    public static final int SYNC_ACTION_UPDATE_CONFLICT = 7;
+
+    public static final int SYNC_ACTION_ERROR = 8;
+
+    private String mGid;
+
+    private String mName;
+
+    private long mLastModified;
+
+    private boolean mDeleted;
+
+    public Node() {
+        mGid = null;
+        mName = "";
+        mLastModified = 0;
+        mDeleted = false;
+    }
+
+    public abstract JSONObject getCreateAction(int actionId);
+
+    public abstract JSONObject getUpdateAction(int actionId);
+
+    public abstract void setContentByRemoteJSON(JSONObject js);
+
+    public abstract void setContentByLocalJSON(JSONObject js);
+
+    public abstract JSONObject getLocalJSONFromContent();
+
+    public abstract int getSyncAction(Cursor c);
+
+    public void setGid(String gid) {
+        this.mGid = gid;
+    }
+
+    public void setName(String name) {
+        this.mName = name;
+    }
+
+    public void setLastModified(long lastModified) {
+        this.mLastModified = lastModified;
+    }
+
+    public void setDeleted(boolean deleted) {
+        this.mDeleted = deleted;
+    }
+
+    public String getGid() {
+        return this.mGid;
+    }
+
+    public String getName() {
+        return this.mName;
+    }
+
+    public long getLastModified() {
+        return this.mLastModified;
+    }
+
+    public boolean getDeleted() {
+        return this.mDeleted;
+    }
+
+}

src/net/micode/notes/gtask/data/SqlData.java

@@ -0,0 +1,189 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.gtask.data;
+
+import android.content.ContentResolver;
+import android.content.ContentUris;
+import android.content.ContentValues;
+import android.content.Context;
+import android.database.Cursor;
+import android.net.Uri;
+import android.util.Log;
+
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.DataColumns;
+import net.micode.notes.data.Notes.DataConstants;
+import net.micode.notes.data.Notes.NoteColumns;
+import net.micode.notes.data.NotesDatabaseHelper.TABLE;
+import net.micode.notes.gtask.exception.ActionFailureException;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+
+
+public class SqlData {
+    private static final String TAG = SqlData.class.getSimpleName();
+
+    private static final int INVALID_ID = -99999;
+
+    public static final String[] PROJECTION_DATA = new String[] {
+            DataColumns.ID, DataColumns.MIME_TYPE, DataColumns.CONTENT, DataColumns.DATA1,
+            DataColumns.DATA3
+    };
+
+    public static final int DATA_ID_COLUMN = 0;
+
+    public static final int DATA_MIME_TYPE_COLUMN = 1;
+
+    public static final int DATA_CONTENT_COLUMN = 2;
+
+    public static final int DATA_CONTENT_DATA_1_COLUMN = 3;
+
+    public static final int DATA_CONTENT_DATA_3_COLUMN = 4;
+
+    private ContentResolver mContentResolver;
+
+    private boolean mIsCreate;
+
+    private long mDataId;
+
+    private String mDataMimeType;
+
+    private String mDataContent;
+
+    private long mDataContentData1;
+
+    private String mDataContentData3;
+
+    private ContentValues mDiffDataValues;
+
+    public SqlData(Context context) {
+        mContentResolver = context.getContentResolver();
+        mIsCreate = true;
+        mDataId = INVALID_ID;
+        mDataMimeType = DataConstants.NOTE;
+        mDataContent = "";
+        mDataContentData1 = 0;
+        mDataContentData3 = "";
+        mDiffDataValues = new ContentValues();
+    }
+
+    public SqlData(Context context, Cursor c) {
+        mContentResolver = context.getContentResolver();
+        mIsCreate = false;
+        loadFromCursor(c);
+        mDiffDataValues = new ContentValues();
+    }
+
+    private void loadFromCursor(Cursor c) {
+        mDataId = c.getLong(DATA_ID_COLUMN);
+        mDataMimeType = c.getString(DATA_MIME_TYPE_COLUMN);
+        mDataContent = c.getString(DATA_CONTENT_COLUMN);
+        mDataContentData1 = c.getLong(DATA_CONTENT_DATA_1_COLUMN);
+        mDataContentData3 = c.getString(DATA_CONTENT_DATA_3_COLUMN);
+    }
+
+    public void setContent(JSONObject js) throws JSONException {
+        long dataId = js.has(DataColumns.ID) ? js.getLong(DataColumns.ID) : INVALID_ID;
+        if (mIsCreate || mDataId != dataId) {
+            mDiffDataValues.put(DataColumns.ID, dataId);
+        }
+        mDataId = dataId;
+
+        String dataMimeType = js.has(DataColumns.MIME_TYPE) ? js.getString(DataColumns.MIME_TYPE)
+                : DataConstants.NOTE;
+        if (mIsCreate || !mDataMimeType.equals(dataMimeType)) {
+            mDiffDataValues.put(DataColumns.MIME_TYPE, dataMimeType);
+        }
+        mDataMimeType = dataMimeType;
+
+        String dataContent = js.has(DataColumns.CONTENT) ? js.getString(DataColumns.CONTENT) : "";
+        if (mIsCreate || !mDataContent.equals(dataContent)) {
+            mDiffDataValues.put(DataColumns.CONTENT, dataContent);
+        }
+        mDataContent = dataContent;
+
+        long dataContentData1 = js.has(DataColumns.DATA1) ? js.getLong(DataColumns.DATA1) : 0;
+        if (mIsCreate || mDataContentData1 != dataContentData1) {
+            mDiffDataValues.put(DataColumns.DATA1, dataContentData1);
+        }
+        mDataContentData1 = dataContentData1;
+
+        String dataContentData3 = js.has(DataColumns.DATA3) ? js.getString(DataColumns.DATA3) : "";
+        if (mIsCreate || !mDataContentData3.equals(dataContentData3)) {
+            mDiffDataValues.put(DataColumns.DATA3, dataContentData3);
+        }
+        mDataContentData3 = dataContentData3;
+    }
+
+    public JSONObject getContent() throws JSONException {
+        if (mIsCreate) {
+            Log.e(TAG, "it seems that we haven't created this in database yet");
+            return null;
+        }
+        JSONObject js = new JSONObject();
+        js.put(DataColumns.ID, mDataId);
+        js.put(DataColumns.MIME_TYPE, mDataMimeType);
+        js.put(DataColumns.CONTENT, mDataContent);
+        js.put(DataColumns.DATA1, mDataContentData1);
+        js.put(DataColumns.DATA3, mDataContentData3);
+        return js;
+    }
+
+    public void commit(long noteId, boolean validateVersion, long version) {
+
+        if (mIsCreate) {
+            if (mDataId == INVALID_ID && mDiffDataValues.containsKey(DataColumns.ID)) {
+                mDiffDataValues.remove(DataColumns.ID);
+            }
+
+            mDiffDataValues.put(DataColumns.NOTE_ID, noteId);
+            Uri uri = mContentResolver.insert(Notes.CONTENT_DATA_URI, mDiffDataValues);
+            try {
+                mDataId = Long.valueOf(uri.getPathSegments().get(1));
+            } catch (NumberFormatException e) {
+                Log.e(TAG, "Get note id error :" + e.toString());
+                throw new ActionFailureException("create note failed");
+            }
+        } else {
+            if (mDiffDataValues.size() > 0) {
+                int result = 0;
+                if (!validateVersion) {
+                    result = mContentResolver.update(ContentUris.withAppendedId(
+                            Notes.CONTENT_DATA_URI, mDataId), mDiffDataValues, null, null);
+                } else {
+                    result = mContentResolver.update(ContentUris.withAppendedId(
+                            Notes.CONTENT_DATA_URI, mDataId), mDiffDataValues,
+                            " ? in (SELECT " + NoteColumns.ID + " FROM " + TABLE.NOTE
+                                    + " WHERE " + NoteColumns.VERSION + "=?)", new String[] {
+                                    String.valueOf(noteId), String.valueOf(version)
+                            });
+                }
+                if (result == 0) {
+                    Log.w(TAG, "there is no update. maybe user updates note when syncing");
+                }
+            }
+        }
+
+        mDiffDataValues.clear();
+        mIsCreate = false;
+    }
+
+    public long getId() {
+        return mDataId;
+    }
+}

src/net/micode/notes/gtask/data/SqlNote.java

@@ -0,0 +1,505 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.gtask.data;
+
+import android.appwidget.AppWidgetManager;
+import android.content.ContentResolver;
+import android.content.ContentValues;
+import android.content.Context;
+import android.database.Cursor;
+import android.net.Uri;
+import android.util.Log;
+
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.DataColumns;
+import net.micode.notes.data.Notes.NoteColumns;
+import net.micode.notes.gtask.exception.ActionFailureException;
+import net.micode.notes.tool.GTaskStringUtils;
+import net.micode.notes.tool.ResourceParser;
+
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.util.ArrayList;
+
+
+public class SqlNote {
+    private static final String TAG = SqlNote.class.getSimpleName();
+
+    private static final int INVALID_ID = -99999;
+
+    public static final String[] PROJECTION_NOTE = new String[] {
+            NoteColumns.ID, NoteColumns.ALERTED_DATE, NoteColumns.BG_COLOR_ID,
+            NoteColumns.CREATED_DATE, NoteColumns.HAS_ATTACHMENT, NoteColumns.MODIFIED_DATE,
+            NoteColumns.NOTES_COUNT, NoteColumns.PARENT_ID, NoteColumns.SNIPPET, NoteColumns.TYPE,
+            NoteColumns.WIDGET_ID, NoteColumns.WIDGET_TYPE, NoteColumns.SYNC_ID,
+            NoteColumns.LOCAL_MODIFIED, NoteColumns.ORIGIN_PARENT_ID, NoteColumns.GTASK_ID,
+            NoteColumns.VERSION
+    };
+
+    public static final int ID_COLUMN = 0;
+
+    public static final int ALERTED_DATE_COLUMN = 1;
+
+    public static final int BG_COLOR_ID_COLUMN = 2;
+
+    public static final int CREATED_DATE_COLUMN = 3;
+
+    public static final int HAS_ATTACHMENT_COLUMN = 4;
+
+    public static final int MODIFIED_DATE_COLUMN = 5;
+
+    public static final int NOTES_COUNT_COLUMN = 6;
+
+    public static final int PARENT_ID_COLUMN = 7;
+
+    public static final int SNIPPET_COLUMN = 8;
+
+    public static final int TYPE_COLUMN = 9;
+
+    public static final int WIDGET_ID_COLUMN = 10;
+
+    public static final int WIDGET_TYPE_COLUMN = 11;
+
+    public static final int SYNC_ID_COLUMN = 12;
+
+    public static final int LOCAL_MODIFIED_COLUMN = 13;
+
+    public static final int ORIGIN_PARENT_ID_COLUMN = 14;
+
+    public static final int GTASK_ID_COLUMN = 15;
+
+    public static final int VERSION_COLUMN = 16;
+
+    private Context mContext;
+
+    private ContentResolver mContentResolver;
+
+    private boolean mIsCreate;
+
+    private long mId;
+
+    private long mAlertDate;
+
+    private int mBgColorId;
+
+    private long mCreatedDate;
+
+    private int mHasAttachment;
+
+    private long mModifiedDate;
+
+    private long mParentId;
+
+    private String mSnippet;
+
+    private int mType;
+
+    private int mWidgetId;
+
+    private int mWidgetType;
+
+    private long mOriginParent;
+
+    private long mVersion;
+
+    private ContentValues mDiffNoteValues;
+
+    private ArrayList<SqlData> mDataList;
+
+    public SqlNote(Context context) {
+        mContext = context;
+        mContentResolver = context.getContentResolver();
+        mIsCreate = true;
+        mId = INVALID_ID;
+        mAlertDate = 0;
+        mBgColorId = ResourceParser.getDefaultBgId(context);
+        mCreatedDate = System.currentTimeMillis();
+        mHasAttachment = 0;
+        mModifiedDate = System.currentTimeMillis();
+        mParentId = 0;
+        mSnippet = "";
+        mType = Notes.TYPE_NOTE;
+        mWidgetId = AppWidgetManager.INVALID_APPWIDGET_ID;
+        mWidgetType = Notes.TYPE_WIDGET_INVALIDE;
+        mOriginParent = 0;
+        mVersion = 0;
+        mDiffNoteValues = new ContentValues();
+        mDataList = new ArrayList<SqlData>();
+    }
+
+    public SqlNote(Context context, Cursor c) {
+        mContext = context;
+        mContentResolver = context.getContentResolver();
+        mIsCreate = false;
+        loadFromCursor(c);
+        mDataList = new ArrayList<SqlData>();
+        if (mType == Notes.TYPE_NOTE)
+            loadDataContent();
+        mDiffNoteValues = new ContentValues();
+    }
+
+    public SqlNote(Context context, long id) {
+        mContext = context;
+        mContentResolver = context.getContentResolver();
+        mIsCreate = false;
+        loadFromCursor(id);
+        mDataList = new ArrayList<SqlData>();
+        if (mType == Notes.TYPE_NOTE)
+            loadDataContent();
+        mDiffNoteValues = new ContentValues();
+
+    }
+
+    private void loadFromCursor(long id) {
+        Cursor c = null;
+        try {
+            c = mContentResolver.query(Notes.CONTENT_NOTE_URI, PROJECTION_NOTE, "(_id=?)",
+                    new String[] {
+                        String.valueOf(id)
+                    }, null);
+            if (c != null) {
+                c.moveToNext();
+                loadFromCursor(c);
+            } else {
+                Log.w(TAG, "loadFromCursor: cursor = null");
+            }
+        } finally {
+            if (c != null)
+                c.close();
+        }
+    }
+
+    private void loadFromCursor(Cursor c) {
+        mId = c.getLong(ID_COLUMN);
+        mAlertDate = c.getLong(ALERTED_DATE_COLUMN);
+        mBgColorId = c.getInt(BG_COLOR_ID_COLUMN);
+        mCreatedDate = c.getLong(CREATED_DATE_COLUMN);
+        mHasAttachment = c.getInt(HAS_ATTACHMENT_COLUMN);
+        mModifiedDate = c.getLong(MODIFIED_DATE_COLUMN);
+        mParentId = c.getLong(PARENT_ID_COLUMN);
+        mSnippet = c.getString(SNIPPET_COLUMN);
+        mType = c.getInt(TYPE_COLUMN);
+        mWidgetId = c.getInt(WIDGET_ID_COLUMN);
+        mWidgetType = c.getInt(WIDGET_TYPE_COLUMN);
+        mVersion = c.getLong(VERSION_COLUMN);
+    }
+
+    private void loadDataContent() {
+        Cursor c = null;
+        mDataList.clear();
+        try {
+            c = mContentResolver.query(Notes.CONTENT_DATA_URI, SqlData.PROJECTION_DATA,
+                    "(note_id=?)", new String[] {
+                        String.valueOf(mId)
+                    }, null);
+            if (c != null) {
+                if (c.getCount() == 0) {
+                    Log.w(TAG, "it seems that the note has not data");
+                    return;
+                }
+                while (c.moveToNext()) {
+                    SqlData data = new SqlData(mContext, c);
+                    mDataList.add(data);
+                }
+            } else {
+                Log.w(TAG, "loadDataContent: cursor = null");
+            }
+        } finally {
+            if (c != null)
+                c.close();
+        }
+    }
+
+    public boolean setContent(JSONObject js) {
+        try {
+            JSONObject note = js.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
+            if (note.getInt(NoteColumns.TYPE) == Notes.TYPE_SYSTEM) {
+                Log.w(TAG, "cannot set system folder");
+            } else if (note.getInt(NoteColumns.TYPE) == Notes.TYPE_FOLDER) {
+                // for folder we can only update the snnipet and type
+                String snippet = note.has(NoteColumns.SNIPPET) ? note
+                        .getString(NoteColumns.SNIPPET) : "";
+                if (mIsCreate || !mSnippet.equals(snippet)) {
+                    mDiffNoteValues.put(NoteColumns.SNIPPET, snippet);
+                }
+                mSnippet = snippet;
+
+                int type = note.has(NoteColumns.TYPE) ? note.getInt(NoteColumns.TYPE)
+                        : Notes.TYPE_NOTE;
+                if (mIsCreate || mType != type) {
+                    mDiffNoteValues.put(NoteColumns.TYPE, type);
+                }
+                mType = type;
+            } else if (note.getInt(NoteColumns.TYPE) == Notes.TYPE_NOTE) {
+                JSONArray dataArray = js.getJSONArray(GTaskStringUtils.META_HEAD_DATA);
+                long id = note.has(NoteColumns.ID) ? note.getLong(NoteColumns.ID) : INVALID_ID;
+                if (mIsCreate || mId != id) {
+                    mDiffNoteValues.put(NoteColumns.ID, id);
+                }
+                mId = id;
+
+                long alertDate = note.has(NoteColumns.ALERTED_DATE) ? note
+                        .getLong(NoteColumns.ALERTED_DATE) : 0;
+                if (mIsCreate || mAlertDate != alertDate) {
+                    mDiffNoteValues.put(NoteColumns.ALERTED_DATE, alertDate);
+                }
+                mAlertDate = alertDate;
+
+                int bgColorId = note.has(NoteColumns.BG_COLOR_ID) ? note
+                        .getInt(NoteColumns.BG_COLOR_ID) : ResourceParser.getDefaultBgId(mContext);
+                if (mIsCreate || mBgColorId != bgColorId) {
+                    mDiffNoteValues.put(NoteColumns.BG_COLOR_ID, bgColorId);
+                }
+                mBgColorId = bgColorId;
+
+                long createDate = note.has(NoteColumns.CREATED_DATE) ? note
+                        .getLong(NoteColumns.CREATED_DATE) : System.currentTimeMillis();
+                if (mIsCreate || mCreatedDate != createDate) {
+                    mDiffNoteValues.put(NoteColumns.CREATED_DATE, createDate);
+                }
+                mCreatedDate = createDate;
+
+                int hasAttachment = note.has(NoteColumns.HAS_ATTACHMENT) ? note
+                        .getInt(NoteColumns.HAS_ATTACHMENT) : 0;
+                if (mIsCreate || mHasAttachment != hasAttachment) {
+                    mDiffNoteValues.put(NoteColumns.HAS_ATTACHMENT, hasAttachment);
+                }
+                mHasAttachment = hasAttachment;
+
+                long modifiedDate = note.has(NoteColumns.MODIFIED_DATE) ? note
+                        .getLong(NoteColumns.MODIFIED_DATE) : System.currentTimeMillis();
+                if (mIsCreate || mModifiedDate != modifiedDate) {
+                    mDiffNoteValues.put(NoteColumns.MODIFIED_DATE, modifiedDate);
+                }
+                mModifiedDate = modifiedDate;
+
+                long parentId = note.has(NoteColumns.PARENT_ID) ? note
+                        .getLong(NoteColumns.PARENT_ID) : 0;
+                if (mIsCreate || mParentId != parentId) {
+                    mDiffNoteValues.put(NoteColumns.PARENT_ID, parentId);
+                }
+                mParentId = parentId;
+
+                String snippet = note.has(NoteColumns.SNIPPET) ? note
+                        .getString(NoteColumns.SNIPPET) : "";
+                if (mIsCreate || !mSnippet.equals(snippet)) {
+                    mDiffNoteValues.put(NoteColumns.SNIPPET, snippet);
+                }
+                mSnippet = snippet;
+
+                int type = note.has(NoteColumns.TYPE) ? note.getInt(NoteColumns.TYPE)
+                        : Notes.TYPE_NOTE;
+                if (mIsCreate || mType != type) {
+                    mDiffNoteValues.put(NoteColumns.TYPE, type);
+                }
+                mType = type;
+
+                int widgetId = note.has(NoteColumns.WIDGET_ID) ? note.getInt(NoteColumns.WIDGET_ID)
+                        : AppWidgetManager.INVALID_APPWIDGET_ID;
+                if (mIsCreate || mWidgetId != widgetId) {
+                    mDiffNoteValues.put(NoteColumns.WIDGET_ID, widgetId);
+                }
+                mWidgetId = widgetId;
+
+                int widgetType = note.has(NoteColumns.WIDGET_TYPE) ? note
+                        .getInt(NoteColumns.WIDGET_TYPE) : Notes.TYPE_WIDGET_INVALIDE;
+                if (mIsCreate || mWidgetType != widgetType) {
+                    mDiffNoteValues.put(NoteColumns.WIDGET_TYPE, widgetType);
+                }
+                mWidgetType = widgetType;
+
+                long originParent = note.has(NoteColumns.ORIGIN_PARENT_ID) ? note
+                        .getLong(NoteColumns.ORIGIN_PARENT_ID) : 0;
+                if (mIsCreate || mOriginParent != originParent) {
+                    mDiffNoteValues.put(NoteColumns.ORIGIN_PARENT_ID, originParent);
+                }
+                mOriginParent = originParent;
+
+                for (int i = 0; i < dataArray.length(); i++) {
+                    JSONObject data = dataArray.getJSONObject(i);
+                    SqlData sqlData = null;
+                    if (data.has(DataColumns.ID)) {
+                        long dataId = data.getLong(DataColumns.ID);
+                        for (SqlData temp : mDataList) {
+                            if (dataId == temp.getId()) {
+                                sqlData = temp;
+                            }
+                        }
+                    }
+
+                    if (sqlData == null) {
+                        sqlData = new SqlData(mContext);
+                        mDataList.add(sqlData);
+                    }
+
+                    sqlData.setContent(data);
+                }
+            }
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            return false;
+        }
+        return true;
+    }
+
+    public JSONObject getContent() {
+        try {
+            JSONObject js = new JSONObject();
+
+            if (mIsCreate) {
+                Log.e(TAG, "it seems that we haven't created this in database yet");
+                return null;
+            }
+
+            JSONObject note = new JSONObject();
+            if (mType == Notes.TYPE_NOTE) {
+                note.put(NoteColumns.ID, mId);
+                note.put(NoteColumns.ALERTED_DATE, mAlertDate);
+                note.put(NoteColumns.BG_COLOR_ID, mBgColorId);
+                note.put(NoteColumns.CREATED_DATE, mCreatedDate);
+                note.put(NoteColumns.HAS_ATTACHMENT, mHasAttachment);
+                note.put(NoteColumns.MODIFIED_DATE, mModifiedDate);
+                note.put(NoteColumns.PARENT_ID, mParentId);
+                note.put(NoteColumns.SNIPPET, mSnippet);
+                note.put(NoteColumns.TYPE, mType);
+                note.put(NoteColumns.WIDGET_ID, mWidgetId);
+                note.put(NoteColumns.WIDGET_TYPE, mWidgetType);
+                note.put(NoteColumns.ORIGIN_PARENT_ID, mOriginParent);
+                js.put(GTaskStringUtils.META_HEAD_NOTE, note);
+
+                JSONArray dataArray = new JSONArray();
+                for (SqlData sqlData : mDataList) {
+                    JSONObject data = sqlData.getContent();
+                    if (data != null) {
+                        dataArray.put(data);
+                    }
+                }
+                js.put(GTaskStringUtils.META_HEAD_DATA, dataArray);
+            } else if (mType == Notes.TYPE_FOLDER || mType == Notes.TYPE_SYSTEM) {
+                note.put(NoteColumns.ID, mId);
+                note.put(NoteColumns.TYPE, mType);
+                note.put(NoteColumns.SNIPPET, mSnippet);
+                js.put(GTaskStringUtils.META_HEAD_NOTE, note);
+            }
+
+            return js;
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    public void setParentId(long id) {
+        mParentId = id;
+        mDiffNoteValues.put(NoteColumns.PARENT_ID, id);
+    }
+
+    public void setGtaskId(String gid) {
+        mDiffNoteValues.put(NoteColumns.GTASK_ID, gid);
+    }
+
+    public void setSyncId(long syncId) {
+        mDiffNoteValues.put(NoteColumns.SYNC_ID, syncId);
+    }
+
+    public void resetLocalModified() {
+        mDiffNoteValues.put(NoteColumns.LOCAL_MODIFIED, 0);
+    }
+
+    public long getId() {
+        return mId;
+    }
+
+    public long getParentId() {
+        return mParentId;
+    }
+
+    public String getSnippet() {
+        return mSnippet;
+    }
+
+    public boolean isNoteType() {
+        return mType == Notes.TYPE_NOTE;
+    }
+
+    public void commit(boolean validateVersion) {
+        if (mIsCreate) {
+            if (mId == INVALID_ID && mDiffNoteValues.containsKey(NoteColumns.ID)) {
+                mDiffNoteValues.remove(NoteColumns.ID);
+            }
+
+            Uri uri = mContentResolver.insert(Notes.CONTENT_NOTE_URI, mDiffNoteValues);
+            try {
+                mId = Long.valueOf(uri.getPathSegments().get(1));
+            } catch (NumberFormatException e) {
+                Log.e(TAG, "Get note id error :" + e.toString());
+                throw new ActionFailureException("create note failed");
+            }
+            if (mId == 0) {
+                throw new IllegalStateException("Create thread id failed");
+            }
+
+            if (mType == Notes.TYPE_NOTE) {
+                for (SqlData sqlData : mDataList) {
+                    sqlData.commit(mId, false, -1);
+                }
+            }
+        } else {
+            if (mId <= 0 && mId != Notes.ID_ROOT_FOLDER && mId != Notes.ID_CALL_RECORD_FOLDER) {
+                Log.e(TAG, "No such note");
+                throw new IllegalStateException("Try to update note with invalid id");
+            }
+            if (mDiffNoteValues.size() > 0) {
+                mVersion ++;
+                int result = 0;
+                if (!validateVersion) {
+                    result = mContentResolver.update(Notes.CONTENT_NOTE_URI, mDiffNoteValues, "("
+                            + NoteColumns.ID + "=?)", new String[] {
+                        String.valueOf(mId)
+                    });
+                } else {
+                    result = mContentResolver.update(Notes.CONTENT_NOTE_URI, mDiffNoteValues, "("
+                            + NoteColumns.ID + "=?) AND (" + NoteColumns.VERSION + "<=?)",
+                            new String[] {
+                                    String.valueOf(mId), String.valueOf(mVersion)
+                            });
+                }
+                if (result == 0) {
+                    Log.w(TAG, "there is no update. maybe user updates note when syncing");
+                }
+            }
+
+            if (mType == Notes.TYPE_NOTE) {
+                for (SqlData sqlData : mDataList) {
+                    sqlData.commit(mId, validateVersion, mVersion);
+                }
+            }
+        }
+
+        // refresh local info
+        loadFromCursor(mId);
+        if (mType == Notes.TYPE_NOTE)
+            loadDataContent();
+
+        mDiffNoteValues.clear();
+        mIsCreate = false;
+    }
+}

src/net/micode/notes/gtask/data/Task.java

@@ -0,0 +1,351 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.gtask.data;
+
+import android.database.Cursor;
+import android.text.TextUtils;
+import android.util.Log;
+
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.DataColumns;
+import net.micode.notes.data.Notes.DataConstants;
+import net.micode.notes.data.Notes.NoteColumns;
+import net.micode.notes.gtask.exception.ActionFailureException;
+import net.micode.notes.tool.GTaskStringUtils;
+
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+
+
+public class Task extends Node {
+    private static final String TAG = Task.class.getSimpleName();
+
+    private boolean mCompleted;
+
+    private String mNotes;
+
+    private JSONObject mMetaInfo;
+
+    private Task mPriorSibling;
+
+    private TaskList mParent;
+
+    public Task() {
+        super();
+        mCompleted = false;
+        mNotes = null;
+        mPriorSibling = null;
+        mParent = null;
+        mMetaInfo = null;
+    }
+
+    public JSONObject getCreateAction(int actionId) {
+        JSONObject js = new JSONObject();
+
+        try {
+            // action_type
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE,
+                    GTaskStringUtils.GTASK_JSON_ACTION_TYPE_CREATE);
+
+            // action_id
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, actionId);
+
+            // index
+            js.put(GTaskStringUtils.GTASK_JSON_INDEX, mParent.getChildTaskIndex(this));
+
+            // entity_delta
+            JSONObject entity = new JSONObject();
+            entity.put(GTaskStringUtils.GTASK_JSON_NAME, getName());
+            entity.put(GTaskStringUtils.GTASK_JSON_CREATOR_ID, "null");
+            entity.put(GTaskStringUtils.GTASK_JSON_ENTITY_TYPE,
+                    GTaskStringUtils.GTASK_JSON_TYPE_TASK);
+            if (getNotes() != null) {
+                entity.put(GTaskStringUtils.GTASK_JSON_NOTES, getNotes());
+            }
+            js.put(GTaskStringUtils.GTASK_JSON_ENTITY_DELTA, entity);
+
+            // parent_id
+            js.put(GTaskStringUtils.GTASK_JSON_PARENT_ID, mParent.getGid());
+
+            // dest_parent_type
+            js.put(GTaskStringUtils.GTASK_JSON_DEST_PARENT_TYPE,
+                    GTaskStringUtils.GTASK_JSON_TYPE_GROUP);
+
+            // list_id
+            js.put(GTaskStringUtils.GTASK_JSON_LIST_ID, mParent.getGid());
+
+            // prior_sibling_id
+            if (mPriorSibling != null) {
+                js.put(GTaskStringUtils.GTASK_JSON_PRIOR_SIBLING_ID, mPriorSibling.getGid());
+            }
+
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("fail to generate task-create jsonobject");
+        }
+
+        return js;
+    }
+
+    public JSONObject getUpdateAction(int actionId) {
+        JSONObject js = new JSONObject();
+
+        try {
+            // action_type
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE,
+                    GTaskStringUtils.GTASK_JSON_ACTION_TYPE_UPDATE);
+
+            // action_id
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, actionId);
+
+            // id
+            js.put(GTaskStringUtils.GTASK_JSON_ID, getGid());
+
+            // entity_delta
+            JSONObject entity = new JSONObject();
+            entity.put(GTaskStringUtils.GTASK_JSON_NAME, getName());
+            if (getNotes() != null) {
+                entity.put(GTaskStringUtils.GTASK_JSON_NOTES, getNotes());
+            }
+            entity.put(GTaskStringUtils.GTASK_JSON_DELETED, getDeleted());
+            js.put(GTaskStringUtils.GTASK_JSON_ENTITY_DELTA, entity);
+
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("fail to generate task-update jsonobject");
+        }
+
+        return js;
+    }
+
+    public void setContentByRemoteJSON(JSONObject js) {
+        if (js != null) {
+            try {
+                // id
+                if (js.has(GTaskStringUtils.GTASK_JSON_ID)) {
+                    setGid(js.getString(GTaskStringUtils.GTASK_JSON_ID));
+                }
+
+                // last_modified
+                if (js.has(GTaskStringUtils.GTASK_JSON_LAST_MODIFIED)) {
+                    setLastModified(js.getLong(GTaskStringUtils.GTASK_JSON_LAST_MODIFIED));
+                }
+
+                // name
+                if (js.has(GTaskStringUtils.GTASK_JSON_NAME)) {
+                    setName(js.getString(GTaskStringUtils.GTASK_JSON_NAME));
+                }
+
+                // notes
+                if (js.has(GTaskStringUtils.GTASK_JSON_NOTES)) {
+                    setNotes(js.getString(GTaskStringUtils.GTASK_JSON_NOTES));
+                }
+
+                // deleted
+                if (js.has(GTaskStringUtils.GTASK_JSON_DELETED)) {
+                    setDeleted(js.getBoolean(GTaskStringUtils.GTASK_JSON_DELETED));
+                }
+
+                // completed
+                if (js.has(GTaskStringUtils.GTASK_JSON_COMPLETED)) {
+                    setCompleted(js.getBoolean(GTaskStringUtils.GTASK_JSON_COMPLETED));
+                }
+            } catch (JSONException e) {
+                Log.e(TAG, e.toString());
+                e.printStackTrace();
+                throw new ActionFailureException("fail to get task content from jsonobject");
+            }
+        }
+    }
+
+    public void setContentByLocalJSON(JSONObject js) {
+        if (js == null || !js.has(GTaskStringUtils.META_HEAD_NOTE)
+                || !js.has(GTaskStringUtils.META_HEAD_DATA)) {
+            Log.w(TAG, "setContentByLocalJSON: nothing is avaiable");
+        }
+
+        try {
+            JSONObject note = js.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
+            JSONArray dataArray = js.getJSONArray(GTaskStringUtils.META_HEAD_DATA);
+
+            if (note.getInt(NoteColumns.TYPE) != Notes.TYPE_NOTE) {
+                Log.e(TAG, "invalid type");
+                return;
+            }
+
+            for (int i = 0; i < dataArray.length(); i++) {
+                JSONObject data = dataArray.getJSONObject(i);
+                if (TextUtils.equals(data.getString(DataColumns.MIME_TYPE), DataConstants.NOTE)) {
+                    setName(data.getString(DataColumns.CONTENT));
+                    break;
+                }
+            }
+
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+        }
+    }
+
+    public JSONObject getLocalJSONFromContent() {
+        String name = getName();
+        try {
+            if (mMetaInfo == null) {
+                // new task created from web
+                if (name == null) {
+                    Log.w(TAG, "the note seems to be an empty one");
+                    return null;
+                }
+
+                JSONObject js = new JSONObject();
+                JSONObject note = new JSONObject();
+                JSONArray dataArray = new JSONArray();
+                JSONObject data = new JSONObject();
+                data.put(DataColumns.CONTENT, name);
+                dataArray.put(data);
+                js.put(GTaskStringUtils.META_HEAD_DATA, dataArray);
+                note.put(NoteColumns.TYPE, Notes.TYPE_NOTE);
+                js.put(GTaskStringUtils.META_HEAD_NOTE, note);
+                return js;
+            } else {
+                // synced task
+                JSONObject note = mMetaInfo.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
+                JSONArray dataArray = mMetaInfo.getJSONArray(GTaskStringUtils.META_HEAD_DATA);
+
+                for (int i = 0; i < dataArray.length(); i++) {
+                    JSONObject data = dataArray.getJSONObject(i);
+                    if (TextUtils.equals(data.getString(DataColumns.MIME_TYPE), DataConstants.NOTE)) {
+                        data.put(DataColumns.CONTENT, getName());
+                        break;
+                    }
+                }
+
+                note.put(NoteColumns.TYPE, Notes.TYPE_NOTE);
+                return mMetaInfo;
+            }
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            return null;
+        }
+    }
+
+    public void setMetaInfo(MetaData metaData) {
+        if (metaData != null && metaData.getNotes() != null) {
+            try {
+                mMetaInfo = new JSONObject(metaData.getNotes());
+            } catch (JSONException e) {
+                Log.w(TAG, e.toString());
+                mMetaInfo = null;
+            }
+        }
+    }
+
+    public int getSyncAction(Cursor c) {
+        try {
+            JSONObject noteInfo = null;
+            if (mMetaInfo != null && mMetaInfo.has(GTaskStringUtils.META_HEAD_NOTE)) {
+                noteInfo = mMetaInfo.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
+            }
+
+            if (noteInfo == null) {
+                Log.w(TAG, "it seems that note meta has been deleted");
+                return SYNC_ACTION_UPDATE_REMOTE;
+            }
+
+            if (!noteInfo.has(NoteColumns.ID)) {
+                Log.w(TAG, "remote note id seems to be deleted");
+                return SYNC_ACTION_UPDATE_LOCAL;
+            }
+
+            // validate the note id now
+            if (c.getLong(SqlNote.ID_COLUMN) != noteInfo.getLong(NoteColumns.ID)) {
+                Log.w(TAG, "note id doesn't match");
+                return SYNC_ACTION_UPDATE_LOCAL;
+            }
+
+            if (c.getInt(SqlNote.LOCAL_MODIFIED_COLUMN) == 0) {
+                // there is no local update
+                if (c.getLong(SqlNote.SYNC_ID_COLUMN) == getLastModified()) {
+                    // no update both side
+                    return SYNC_ACTION_NONE;
+                } else {
+                    // apply remote to local
+                    return SYNC_ACTION_UPDATE_LOCAL;
+                }
+            } else {
+                // validate gtask id
+                if (!c.getString(SqlNote.GTASK_ID_COLUMN).equals(getGid())) {
+                    Log.e(TAG, "gtask id doesn't match");
+                    return SYNC_ACTION_ERROR;
+                }
+                if (c.getLong(SqlNote.SYNC_ID_COLUMN) == getLastModified()) {
+                    // local modification only
+                    return SYNC_ACTION_UPDATE_REMOTE;
+                } else {
+                    return SYNC_ACTION_UPDATE_CONFLICT;
+                }
+            }
+        } catch (Exception e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+        }
+
+        return SYNC_ACTION_ERROR;
+    }
+
+    public boolean isWorthSaving() {
+        return mMetaInfo != null || (getName() != null && getName().trim().length() > 0)
+                || (getNotes() != null && getNotes().trim().length() > 0);
+    }
+
+    public void setCompleted(boolean completed) {
+        this.mCompleted = completed;
+    }
+
+    public void setNotes(String notes) {
+        this.mNotes = notes;
+    }
+
+    public void setPriorSibling(Task priorSibling) {
+        this.mPriorSibling = priorSibling;
+    }
+
+    public void setParent(TaskList parent) {
+        this.mParent = parent;
+    }
+
+    public boolean getCompleted() {
+        return this.mCompleted;
+    }
+
+    public String getNotes() {
+        return this.mNotes;
+    }
+
+    public Task getPriorSibling() {
+        return this.mPriorSibling;
+    }
+
+    public TaskList getParent() {
+        return this.mParent;
+    }
+
+}

src/net/micode/notes/gtask/data/TaskList.java

@@ -0,0 +1,343 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.gtask.data;
+
+import android.database.Cursor;
+import android.util.Log;
+
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.NoteColumns;
+import net.micode.notes.gtask.exception.ActionFailureException;
+import net.micode.notes.tool.GTaskStringUtils;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.util.ArrayList;
+
+
+public class TaskList extends Node {
+    private static final String TAG = TaskList.class.getSimpleName();
+
+    private int mIndex;
+
+    private ArrayList<Task> mChildren;
+
+    public TaskList() {
+        super();
+        mChildren = new ArrayList<Task>();
+        mIndex = 1;
+    }
+
+    public JSONObject getCreateAction(int actionId) {
+        JSONObject js = new JSONObject();
+
+        try {
+            // action_type
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE,
+                    GTaskStringUtils.GTASK_JSON_ACTION_TYPE_CREATE);
+
+            // action_id
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, actionId);
+
+            // index
+            js.put(GTaskStringUtils.GTASK_JSON_INDEX, mIndex);
+
+            // entity_delta
+            JSONObject entity = new JSONObject();
+            entity.put(GTaskStringUtils.GTASK_JSON_NAME, getName());
+            entity.put(GTaskStringUtils.GTASK_JSON_CREATOR_ID, "null");
+            entity.put(GTaskStringUtils.GTASK_JSON_ENTITY_TYPE,
+                    GTaskStringUtils.GTASK_JSON_TYPE_GROUP);
+            js.put(GTaskStringUtils.GTASK_JSON_ENTITY_DELTA, entity);
+
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("fail to generate tasklist-create jsonobject");
+        }
+
+        return js;
+    }
+
+    public JSONObject getUpdateAction(int actionId) {
+        JSONObject js = new JSONObject();
+
+        try {
+            // action_type
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE,
+                    GTaskStringUtils.GTASK_JSON_ACTION_TYPE_UPDATE);
+
+            // action_id
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, actionId);
+
+            // id
+            js.put(GTaskStringUtils.GTASK_JSON_ID, getGid());
+
+            // entity_delta
+            JSONObject entity = new JSONObject();
+            entity.put(GTaskStringUtils.GTASK_JSON_NAME, getName());
+            entity.put(GTaskStringUtils.GTASK_JSON_DELETED, getDeleted());
+            js.put(GTaskStringUtils.GTASK_JSON_ENTITY_DELTA, entity);
+
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("fail to generate tasklist-update jsonobject");
+        }
+
+        return js;
+    }
+
+    public void setContentByRemoteJSON(JSONObject js) {
+        if (js != null) {
+            try {
+                // id
+                if (js.has(GTaskStringUtils.GTASK_JSON_ID)) {
+                    setGid(js.getString(GTaskStringUtils.GTASK_JSON_ID));
+                }
+
+                // last_modified
+                if (js.has(GTaskStringUtils.GTASK_JSON_LAST_MODIFIED)) {
+                    setLastModified(js.getLong(GTaskStringUtils.GTASK_JSON_LAST_MODIFIED));
+                }
+
+                // name
+                if (js.has(GTaskStringUtils.GTASK_JSON_NAME)) {
+                    setName(js.getString(GTaskStringUtils.GTASK_JSON_NAME));
+                }
+
+            } catch (JSONException e) {
+                Log.e(TAG, e.toString());
+                e.printStackTrace();
+                throw new ActionFailureException("fail to get tasklist content from jsonobject");
+            }
+        }
+    }
+
+    public void setContentByLocalJSON(JSONObject js) {
+        if (js == null || !js.has(GTaskStringUtils.META_HEAD_NOTE)) {
+            Log.w(TAG, "setContentByLocalJSON: nothing is avaiable");
+        }
+
+        try {
+            JSONObject folder = js.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
+
+            if (folder.getInt(NoteColumns.TYPE) == Notes.TYPE_FOLDER) {
+                String name = folder.getString(NoteColumns.SNIPPET);
+                setName(GTaskStringUtils.MIUI_FOLDER_PREFFIX + name);
+            } else if (folder.getInt(NoteColumns.TYPE) == Notes.TYPE_SYSTEM) {
+                if (folder.getLong(NoteColumns.ID) == Notes.ID_ROOT_FOLDER)
+                    setName(GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_DEFAULT);
+                else if (folder.getLong(NoteColumns.ID) == Notes.ID_CALL_RECORD_FOLDER)
+                    setName(GTaskStringUtils.MIUI_FOLDER_PREFFIX
+                            + GTaskStringUtils.FOLDER_CALL_NOTE);
+                else
+                    Log.e(TAG, "invalid system folder");
+            } else {
+                Log.e(TAG, "error type");
+            }
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+        }
+    }
+
+    public JSONObject getLocalJSONFromContent() {
+        try {
+            JSONObject js = new JSONObject();
+            JSONObject folder = new JSONObject();
+
+            String folderName = getName();
+            if (getName().startsWith(GTaskStringUtils.MIUI_FOLDER_PREFFIX))
+                folderName = folderName.substring(GTaskStringUtils.MIUI_FOLDER_PREFFIX.length(),
+                        folderName.length());
+            folder.put(NoteColumns.SNIPPET, folderName);
+            if (folderName.equals(GTaskStringUtils.FOLDER_DEFAULT)
+                    || folderName.equals(GTaskStringUtils.FOLDER_CALL_NOTE))
+                folder.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
+            else
+                folder.put(NoteColumns.TYPE, Notes.TYPE_FOLDER);
+
+            js.put(GTaskStringUtils.META_HEAD_NOTE, folder);
+
+            return js;
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            return null;
+        }
+    }
+
+    public int getSyncAction(Cursor c) {
+        try {
+            if (c.getInt(SqlNote.LOCAL_MODIFIED_COLUMN) == 0) {
+                // there is no local update
+                if (c.getLong(SqlNote.SYNC_ID_COLUMN) == getLastModified()) {
+                    // no update both side
+                    return SYNC_ACTION_NONE;
+                } else {
+                    // apply remote to local
+                    return SYNC_ACTION_UPDATE_LOCAL;
+                }
+            } else {
+                // validate gtask id
+                if (!c.getString(SqlNote.GTASK_ID_COLUMN).equals(getGid())) {
+                    Log.e(TAG, "gtask id doesn't match");
+                    return SYNC_ACTION_ERROR;
+                }
+                if (c.getLong(SqlNote.SYNC_ID_COLUMN) == getLastModified()) {
+                    // local modification only
+                    return SYNC_ACTION_UPDATE_REMOTE;
+                } else {
+                    // for folder conflicts, just apply local modification
+                    return SYNC_ACTION_UPDATE_REMOTE;
+                }
+            }
+        } catch (Exception e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+        }
+
+        return SYNC_ACTION_ERROR;
+    }
+
+    public int getChildTaskCount() {
+        return mChildren.size();
+    }
+
+    public boolean addChildTask(Task task) {
+        boolean ret = false;
+        if (task != null && !mChildren.contains(task)) {
+            ret = mChildren.add(task);
+            if (ret) {
+                // need to set prior sibling and parent
+                task.setPriorSibling(mChildren.isEmpty() ? null : mChildren
+                        .get(mChildren.size() - 1));
+                task.setParent(this);
+            }
+        }
+        return ret;
+    }
+
+    public boolean addChildTask(Task task, int index) {
+        if (index < 0 || index > mChildren.size()) {
+            Log.e(TAG, "add child task: invalid index");
+            return false;
+        }
+
+        int pos = mChildren.indexOf(task);
+        if (task != null && pos == -1) {
+            mChildren.add(index, task);
+
+            // update the task list
+            Task preTask = null;
+            Task afterTask = null;
+            if (index != 0)
+                preTask = mChildren.get(index - 1);
+            if (index != mChildren.size() - 1)
+                afterTask = mChildren.get(index + 1);
+
+            task.setPriorSibling(preTask);
+            if (afterTask != null)
+                afterTask.setPriorSibling(task);
+        }
+
+        return true;
+    }
+
+    public boolean removeChildTask(Task task) {
+        boolean ret = false;
+        int index = mChildren.indexOf(task);
+        if (index != -1) {
+            ret = mChildren.remove(task);
+
+            if (ret) {
+                // reset prior sibling and parent
+                task.setPriorSibling(null);
+                task.setParent(null);
+
+                // update the task list
+                if (index != mChildren.size()) {
+                    mChildren.get(index).setPriorSibling(
+                            index == 0 ? null : mChildren.get(index - 1));
+                }
+            }
+        }
+        return ret;
+    }
+
+    public boolean moveChildTask(Task task, int index) {
+
+        if (index < 0 || index >= mChildren.size()) {
+            Log.e(TAG, "move child task: invalid index");
+            return false;
+        }
+
+        int pos = mChildren.indexOf(task);
+        if (pos == -1) {
+            Log.e(TAG, "move child task: the task should in the list");
+            return false;
+        }
+
+        if (pos == index)
+            return true;
+        return (removeChildTask(task) && addChildTask(task, index));
+    }
+
+    public Task findChildTaskByGid(String gid) {
+        for (int i = 0; i < mChildren.size(); i++) {
+            Task t = mChildren.get(i);
+            if (t.getGid().equals(gid)) {
+                return t;
+            }
+        }
+        return null;
+    }
+
+    public int getChildTaskIndex(Task task) {
+        return mChildren.indexOf(task);
+    }
+
+    public Task getChildTaskByIndex(int index) {
+        if (index < 0 || index >= mChildren.size()) {
+            Log.e(TAG, "getTaskByIndex: invalid index");
+            return null;
+        }
+        return mChildren.get(index);
+    }
+
+    public Task getChilTaskByGid(String gid) {
+        for (Task task : mChildren) {
+            if (task.getGid().equals(gid))
+                return task;
+        }
+        return null;
+    }
+
+    public ArrayList<Task> getChildTaskList() {
+        return this.mChildren;
+    }
+
+    public void setIndex(int index) {
+        this.mIndex = index;
+    }
+
+    public int getIndex() {
+        return this.mIndex;
+    }
+}

src/net/micode/notes/gtask/exception/ActionFailureException.java

@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.gtask.exception;
+
+public class ActionFailureException extends RuntimeException {
+    private static final long serialVersionUID = 4425249765923293627L;
+
+    public ActionFailureException() {
+        super();
+    }
+
+    public ActionFailureException(String paramString) {
+        super(paramString);
+    }
+
+    public ActionFailureException(String paramString, Throwable paramThrowable) {
+        super(paramString, paramThrowable);
+    }
+}

src/net/micode/notes/gtask/exception/NetworkFailureException.java

@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.gtask.exception;
+
+public class NetworkFailureException extends Exception {
+    private static final long serialVersionUID = 2107610287180234136L;
+
+    public NetworkFailureException() {
+        super();
+    }
+
+    public NetworkFailureException(String paramString) {
+        super(paramString);
+    }
+
+    public NetworkFailureException(String paramString, Throwable paramThrowable) {
+        super(paramString, paramThrowable);
+    }
+}

src/net/micode/notes/gtask/remote/GTaskASyncTask.java

@@ -0,0 +1,123 @@
+
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.gtask.remote;
+
+import android.app.Notification;
+import android.app.NotificationManager;
+import android.app.PendingIntent;
+import android.content.Context;
+import android.content.Intent;
+import android.os.AsyncTask;
+
+import net.micode.notes.R;
+import net.micode.notes.ui.NotesListActivity;
+import net.micode.notes.ui.NotesPreferenceActivity;
+
+
+public class GTaskASyncTask extends AsyncTask<Void, String, Integer> {
+
+    private static int GTASK_SYNC_NOTIFICATION_ID = 5234235;
+
+    public interface OnCompleteListener {
+        void onComplete();
+    }
+
+    private Context mContext;
+
+    private NotificationManager mNotifiManager;
+
+    private GTaskManager mTaskManager;
+
+    private OnCompleteListener mOnCompleteListener;
+
+    public GTaskASyncTask(Context context, OnCompleteListener listener) {
+        mContext = context;
+        mOnCompleteListener = listener;
+        mNotifiManager = (NotificationManager) mContext
+                .getSystemService(Context.NOTIFICATION_SERVICE);
+        mTaskManager = GTaskManager.getInstance();
+    }
+
+    public void cancelSync() {
+        mTaskManager.cancelSync();
+    }
+
+    public void publishProgess(String message) {
+        publishProgress(new String[] {
+            message
+        });
+    }
+
+    private void showNotification(int tickerId, String content) {
+        Notification notification = new Notification(R.drawable.notification, mContext
+                .getString(tickerId), System.currentTimeMillis());
+        notification.defaults = Notification.DEFAULT_LIGHTS;
+        notification.flags = Notification.FLAG_AUTO_CANCEL;
+        PendingIntent pendingIntent;
+        if (tickerId != R.string.ticker_success) {
+            pendingIntent = PendingIntent.getActivity(mContext, 0, new Intent(mContext,
+                    NotesPreferenceActivity.class), 0);
+
+        } else {
+            pendingIntent = PendingIntent.getActivity(mContext, 0, new Intent(mContext,
+                    NotesListActivity.class), 0);
+        }
+        notification.setLatestEventInfo(mContext, mContext.getString(R.string.app_name), content,
+                pendingIntent);
+        mNotifiManager.notify(GTASK_SYNC_NOTIFICATION_ID, notification);
+    }
+
+    @Override
+    protected Integer doInBackground(Void... unused) {
+        publishProgess(mContext.getString(R.string.sync_progress_login, NotesPreferenceActivity
+                .getSyncAccountName(mContext)));
+        return mTaskManager.sync(mContext, this);
+    }
+
+    @Override
+    protected void onProgressUpdate(String... progress) {
+        showNotification(R.string.ticker_syncing, progress[0]);
+        if (mContext instanceof GTaskSyncService) {
+            ((GTaskSyncService) mContext).sendBroadcast(progress[0]);
+        }
+    }
+
+    @Override
+    protected void onPostExecute(Integer result) {
+        if (result == GTaskManager.STATE_SUCCESS) {
+            showNotification(R.string.ticker_success, mContext.getString(
+                    R.string.success_sync_account, mTaskManager.getSyncAccount()));
+            NotesPreferenceActivity.setLastSyncTime(mContext, System.currentTimeMillis());
+        } else if (result == GTaskManager.STATE_NETWORK_ERROR) {
+            showNotification(R.string.ticker_fail, mContext.getString(R.string.error_sync_network));
+        } else if (result == GTaskManager.STATE_INTERNAL_ERROR) {
+            showNotification(R.string.ticker_fail, mContext.getString(R.string.error_sync_internal));
+        } else if (result == GTaskManager.STATE_SYNC_CANCELLED) {
+            showNotification(R.string.ticker_cancel, mContext
+                    .getString(R.string.error_sync_cancelled));
+        }
+        if (mOnCompleteListener != null) {
+            new Thread(new Runnable() {
+
+                public void run() {
+                    mOnCompleteListener.onComplete();
+                }
+            }).start();
+        }
+    }
+}

src/net/micode/notes/gtask/remote/GTaskClient.java

@@ -0,0 +1,585 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.gtask.remote;
+
+import android.accounts.Account;
+import android.accounts.AccountManager;
+import android.accounts.AccountManagerFuture;
+import android.app.Activity;
+import android.os.Bundle;
+import android.text.TextUtils;
+import android.util.Log;
+
+import net.micode.notes.gtask.data.Node;
+import net.micode.notes.gtask.data.Task;
+import net.micode.notes.gtask.data.TaskList;
+import net.micode.notes.gtask.exception.ActionFailureException;
+import net.micode.notes.gtask.exception.NetworkFailureException;
+import net.micode.notes.tool.GTaskStringUtils;
+import net.micode.notes.ui.NotesPreferenceActivity;
+
+import org.apache.http.HttpEntity;
+import org.apache.http.HttpResponse;
+import org.apache.http.client.ClientProtocolException;
+import org.apache.http.client.entity.UrlEncodedFormEntity;
+import org.apache.http.client.methods.HttpGet;
+import org.apache.http.client.methods.HttpPost;
+import org.apache.http.cookie.Cookie;
+import org.apache.http.impl.client.BasicCookieStore;
+import org.apache.http.impl.client.DefaultHttpClient;
+import org.apache.http.message.BasicNameValuePair;
+import org.apache.http.params.BasicHttpParams;
+import org.apache.http.params.HttpConnectionParams;
+import org.apache.http.params.HttpParams;
+import org.apache.http.params.HttpProtocolParams;
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.zip.GZIPInputStream;
+import java.util.zip.Inflater;
+import java.util.zip.InflaterInputStream;
+
+
+public class GTaskClient {
+    private static final String TAG = GTaskClient.class.getSimpleName();
+
+    private static final String GTASK_URL = "https://mail.google.com/tasks/";
+
+    private static final String GTASK_GET_URL = "https://mail.google.com/tasks/ig";
+
+    private static final String GTASK_POST_URL = "https://mail.google.com/tasks/r/ig";
+
+    private static GTaskClient mInstance = null;
+
+    private DefaultHttpClient mHttpClient;
+
+    private String mGetUrl;
+
+    private String mPostUrl;
+
+    private long mClientVersion;
+
+    private boolean mLoggedin;
+
+    private long mLastLoginTime;
+
+    private int mActionId;
+
+    private Account mAccount;
+
+    private JSONArray mUpdateArray;
+
+    private GTaskClient() {
+        mHttpClient = null;
+        mGetUrl = GTASK_GET_URL;
+        mPostUrl = GTASK_POST_URL;
+        mClientVersion = -1;
+        mLoggedin = false;
+        mLastLoginTime = 0;
+        mActionId = 1;
+        mAccount = null;
+        mUpdateArray = null;
+    }
+
+    public static synchronized GTaskClient getInstance() {
+        if (mInstance == null) {
+            mInstance = new GTaskClient();
+        }
+        return mInstance;
+    }
+
+    public boolean login(Activity activity) {
+        // we suppose that the cookie would expire after 5 minutes
+        // then we need to re-login
+        final long interval = 1000 * 60 * 5;
+        if (mLastLoginTime + interval < System.currentTimeMillis()) {
+            mLoggedin = false;
+        }
+
+        // need to re-login after account switch
+        if (mLoggedin
+                && !TextUtils.equals(getSyncAccount().name, NotesPreferenceActivity
+                        .getSyncAccountName(activity))) {
+            mLoggedin = false;
+        }
+
+        if (mLoggedin) {
+            Log.d(TAG, "already logged in");
+            return true;
+        }
+
+        mLastLoginTime = System.currentTimeMillis();
+        String authToken = loginGoogleAccount(activity, false);
+        if (authToken == null) {
+            Log.e(TAG, "login google account failed");
+            return false;
+        }
+
+        // login with custom domain if necessary
+        if (!(mAccount.name.toLowerCase().endsWith("gmail.com") || mAccount.name.toLowerCase()
+                .endsWith("googlemail.com"))) {
+            StringBuilder url = new StringBuilder(GTASK_URL).append("a/");
+            int index = mAccount.name.indexOf('@') + 1;
+            String suffix = mAccount.name.substring(index);
+            url.append(suffix + "/");
+            mGetUrl = url.toString() + "ig";
+            mPostUrl = url.toString() + "r/ig";
+
+            if (tryToLoginGtask(activity, authToken)) {
+                mLoggedin = true;
+            }
+        }
+
+        // try to login with google official url
+        if (!mLoggedin) {
+            mGetUrl = GTASK_GET_URL;
+            mPostUrl = GTASK_POST_URL;
+            if (!tryToLoginGtask(activity, authToken)) {
+                return false;
+            }
+        }
+
+        mLoggedin = true;
+        return true;
+    }
+
+    private String loginGoogleAccount(Activity activity, boolean invalidateToken) {
+        String authToken;
+        AccountManager accountManager = AccountManager.get(activity);
+        Account[] accounts = accountManager.getAccountsByType("com.google");
+
+        if (accounts.length == 0) {
+            Log.e(TAG, "there is no available google account");
+            return null;
+        }
+
+        String accountName = NotesPreferenceActivity.getSyncAccountName(activity);
+        Account account = null;
+        for (Account a : accounts) {
+            if (a.name.equals(accountName)) {
+                account = a;
+                break;
+            }
+        }
+        if (account != null) {
+            mAccount = account;
+        } else {
+            Log.e(TAG, "unable to get an account with the same name in the settings");
+            return null;
+        }
+
+        // get the token now
+        AccountManagerFuture<Bundle> accountManagerFuture = accountManager.getAuthToken(account,
+                "goanna_mobile", null, activity, null, null);
+        try {
+            Bundle authTokenBundle = accountManagerFuture.getResult();
+            authToken = authTokenBundle.getString(AccountManager.KEY_AUTHTOKEN);
+            if (invalidateToken) {
+                accountManager.invalidateAuthToken("com.google", authToken);
+                loginGoogleAccount(activity, false);
+            }
+        } catch (Exception e) {
+            Log.e(TAG, "get auth token failed");
+            authToken = null;
+        }
+
+        return authToken;
+    }
+
+    private boolean tryToLoginGtask(Activity activity, String authToken) {
+        if (!loginGtask(authToken)) {
+            // maybe the auth token is out of date, now let's invalidate the
+            // token and try again
+            authToken = loginGoogleAccount(activity, true);
+            if (authToken == null) {
+                Log.e(TAG, "login google account failed");
+                return false;
+            }
+
+            if (!loginGtask(authToken)) {
+                Log.e(TAG, "login gtask failed");
+                return false;
+            }
+        }
+        return true;
+    }
+
+    private boolean loginGtask(String authToken) {
+        int timeoutConnection = 10000;
+        int timeoutSocket = 15000;
+        HttpParams httpParameters = new BasicHttpParams();
+        HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection);
+        HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket);
+        mHttpClient = new DefaultHttpClient(httpParameters);
+        BasicCookieStore localBasicCookieStore = new BasicCookieStore();
+        mHttpClient.setCookieStore(localBasicCookieStore);
+        HttpProtocolParams.setUseExpectContinue(mHttpClient.getParams(), false);
+
+        // login gtask
+        try {
+            String loginUrl = mGetUrl + "?auth=" + authToken;
+            HttpGet httpGet = new HttpGet(loginUrl);
+            HttpResponse response = null;
+            response = mHttpClient.execute(httpGet);
+
+            // get the cookie now
+            List<Cookie> cookies = mHttpClient.getCookieStore().getCookies();
+            boolean hasAuthCookie = false;
+            for (Cookie cookie : cookies) {
+                if (cookie.getName().contains("GTL")) {
+                    hasAuthCookie = true;
+                }
+            }
+            if (!hasAuthCookie) {
+                Log.w(TAG, "it seems that there is no auth cookie");
+            }
+
+            // get the client version
+            String resString = getResponseContent(response.getEntity());
+            String jsBegin = "_setup(";
+            String jsEnd = ")}</script>";
+            int begin = resString.indexOf(jsBegin);
+            int end = resString.lastIndexOf(jsEnd);
+            String jsString = null;
+            if (begin != -1 && end != -1 && begin < end) {
+                jsString = resString.substring(begin + jsBegin.length(), end);
+            }
+            JSONObject js = new JSONObject(jsString);
+            mClientVersion = js.getLong("v");
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            return false;
+        } catch (Exception e) {
+            // simply catch all exceptions
+            Log.e(TAG, "httpget gtask_url failed");
+            return false;
+        }
+
+        return true;
+    }
+
+    private int getActionId() {
+        return mActionId++;
+    }
+
+    private HttpPost createHttpPost() {
+        HttpPost httpPost = new HttpPost(mPostUrl);
+        httpPost.setHeader("Content-Type", "application/x-www-form-urlencoded;charset=utf-8");
+        httpPost.setHeader("AT", "1");
+        return httpPost;
+    }
+
+    private String getResponseContent(HttpEntity entity) throws IOException {
+        String contentEncoding = null;
+        if (entity.getContentEncoding() != null) {
+            contentEncoding = entity.getContentEncoding().getValue();
+            Log.d(TAG, "encoding: " + contentEncoding);
+        }
+
+        InputStream input = entity.getContent();
+        if (contentEncoding != null && contentEncoding.equalsIgnoreCase("gzip")) {
+            input = new GZIPInputStream(entity.getContent());
+        } else if (contentEncoding != null && contentEncoding.equalsIgnoreCase("deflate")) {
+            Inflater inflater = new Inflater(true);
+            input = new InflaterInputStream(entity.getContent(), inflater);
+        }
+
+        try {
+            InputStreamReader isr = new InputStreamReader(input);
+            BufferedReader br = new BufferedReader(isr);
+            StringBuilder sb = new StringBuilder();
+
+            while (true) {
+                String buff = br.readLine();
+                if (buff == null) {
+                    return sb.toString();
+                }
+                sb = sb.append(buff);
+            }
+        } finally {
+            input.close();
+        }
+    }
+
+    private JSONObject postRequest(JSONObject js) throws NetworkFailureException {
+        if (!mLoggedin) {
+            Log.e(TAG, "please login first");
+            throw new ActionFailureException("not logged in");
+        }
+
+        HttpPost httpPost = createHttpPost();
+        try {
+            LinkedList<BasicNameValuePair> list = new LinkedList<BasicNameValuePair>();
+            list.add(new BasicNameValuePair("r", js.toString()));
+            UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list, "UTF-8");
+            httpPost.setEntity(entity);
+
+            // execute the post
+            HttpResponse response = mHttpClient.execute(httpPost);
+            String jsString = getResponseContent(response.getEntity());
+            return new JSONObject(jsString);
+
+        } catch (ClientProtocolException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new NetworkFailureException("postRequest failed");
+        } catch (IOException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new NetworkFailureException("postRequest failed");
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("unable to convert response content to jsonobject");
+        } catch (Exception e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("error occurs when posting request");
+        }
+    }
+
+    public void createTask(Task task) throws NetworkFailureException {
+        commitUpdate();
+        try {
+            JSONObject jsPost = new JSONObject();
+            JSONArray actionList = new JSONArray();
+
+            // action_list
+            actionList.put(task.getCreateAction(getActionId()));
+            jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList);
+
+            // client_version
+            jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
+
+            // post
+            JSONObject jsResponse = postRequest(jsPost);
+            JSONObject jsResult = (JSONObject) jsResponse.getJSONArray(
+                    GTaskStringUtils.GTASK_JSON_RESULTS).get(0);
+            task.setGid(jsResult.getString(GTaskStringUtils.GTASK_JSON_NEW_ID));
+
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("create task: handing jsonobject failed");
+        }
+    }
+
+    public void createTaskList(TaskList tasklist) throws NetworkFailureException {
+        commitUpdate();
+        try {
+            JSONObject jsPost = new JSONObject();
+            JSONArray actionList = new JSONArray();
+
+            // action_list
+            actionList.put(tasklist.getCreateAction(getActionId()));
+            jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList);
+
+            // client version
+            jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
+
+            // post
+            JSONObject jsResponse = postRequest(jsPost);
+            JSONObject jsResult = (JSONObject) jsResponse.getJSONArray(
+                    GTaskStringUtils.GTASK_JSON_RESULTS).get(0);
+            tasklist.setGid(jsResult.getString(GTaskStringUtils.GTASK_JSON_NEW_ID));
+
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("create tasklist: handing jsonobject failed");
+        }
+    }
+
+    public void commitUpdate() throws NetworkFailureException {
+        if (mUpdateArray != null) {
+            try {
+                JSONObject jsPost = new JSONObject();
+
+                // action_list
+                jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, mUpdateArray);
+
+                // client_version
+                jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
+
+                postRequest(jsPost);
+                mUpdateArray = null;
+            } catch (JSONException e) {
+                Log.e(TAG, e.toString());
+                e.printStackTrace();
+                throw new ActionFailureException("commit update: handing jsonobject failed");
+            }
+        }
+    }
+
+    public void addUpdateNode(Node node) throws NetworkFailureException {
+        if (node != null) {
+            // too many update items may result in an error
+            // set max to 10 items
+            if (mUpdateArray != null && mUpdateArray.length() > 10) {
+                commitUpdate();
+            }
+
+            if (mUpdateArray == null)
+                mUpdateArray = new JSONArray();
+            mUpdateArray.put(node.getUpdateAction(getActionId()));
+        }
+    }
+
+    public void moveTask(Task task, TaskList preParent, TaskList curParent)
+            throws NetworkFailureException {
+        commitUpdate();
+        try {
+            JSONObject jsPost = new JSONObject();
+            JSONArray actionList = new JSONArray();
+            JSONObject action = new JSONObject();
+
+            // action_list
+            action.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE,
+                    GTaskStringUtils.GTASK_JSON_ACTION_TYPE_MOVE);
+            action.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, getActionId());
+            action.put(GTaskStringUtils.GTASK_JSON_ID, task.getGid());
+            if (preParent == curParent && task.getPriorSibling() != null) {
+                // put prioring_sibing_id only if moving within the tasklist and
+                // it is not the first one
+                action.put(GTaskStringUtils.GTASK_JSON_PRIOR_SIBLING_ID, task.getPriorSibling());
+            }
+            action.put(GTaskStringUtils.GTASK_JSON_SOURCE_LIST, preParent.getGid());
+            action.put(GTaskStringUtils.GTASK_JSON_DEST_PARENT, curParent.getGid());
+            if (preParent != curParent) {
+                // put the dest_list only if moving between tasklists
+                action.put(GTaskStringUtils.GTASK_JSON_DEST_LIST, curParent.getGid());
+            }
+            actionList.put(action);
+            jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList);
+
+            // client_version
+            jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
+
+            postRequest(jsPost);
+
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("move task: handing jsonobject failed");
+        }
+    }
+
+    public void deleteNode(Node node) throws NetworkFailureException {
+        commitUpdate();
+        try {
+            JSONObject jsPost = new JSONObject();
+            JSONArray actionList = new JSONArray();
+
+            // action_list
+            node.setDeleted(true);
+            actionList.put(node.getUpdateAction(getActionId()));
+            jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList);
+
+            // client_version
+            jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
+
+            postRequest(jsPost);
+            mUpdateArray = null;
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("delete node: handing jsonobject failed");
+        }
+    }
+
+    public JSONArray getTaskLists() throws NetworkFailureException {
+        if (!mLoggedin) {
+            Log.e(TAG, "please login first");
+            throw new ActionFailureException("not logged in");
+        }
+
+        try {
+            HttpGet httpGet = new HttpGet(mGetUrl);
+            HttpResponse response = null;
+            response = mHttpClient.execute(httpGet);
+
+            // get the task list
+            String resString = getResponseContent(response.getEntity());
+            String jsBegin = "_setup(";
+            String jsEnd = ")}</script>";
+            int begin = resString.indexOf(jsBegin);
+            int end = resString.lastIndexOf(jsEnd);
+            String jsString = null;
+            if (begin != -1 && end != -1 && begin < end) {
+                jsString = resString.substring(begin + jsBegin.length(), end);
+            }
+            JSONObject js = new JSONObject(jsString);
+            return js.getJSONObject("t").getJSONArray(GTaskStringUtils.GTASK_JSON_LISTS);
+        } catch (ClientProtocolException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new NetworkFailureException("gettasklists: httpget failed");
+        } catch (IOException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new NetworkFailureException("gettasklists: httpget failed");
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("get task lists: handing jasonobject failed");
+        }
+    }
+
+    public JSONArray getTaskList(String listGid) throws NetworkFailureException {
+        commitUpdate();
+        try {
+            JSONObject jsPost = new JSONObject();
+            JSONArray actionList = new JSONArray();
+            JSONObject action = new JSONObject();
+
+            // action_list
+            action.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE,
+                    GTaskStringUtils.GTASK_JSON_ACTION_TYPE_GETALL);
+            action.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, getActionId());
+            action.put(GTaskStringUtils.GTASK_JSON_LIST_ID, listGid);
+            action.put(GTaskStringUtils.GTASK_JSON_GET_DELETED, false);
+            actionList.put(action);
+            jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList);
+
+            // client_version
+            jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
+
+            JSONObject jsResponse = postRequest(jsPost);
+            return jsResponse.getJSONArray(GTaskStringUtils.GTASK_JSON_TASKS);
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("get task list: handing jsonobject failed");
+        }
+    }
+
+    public Account getSyncAccount() {
+        return mAccount;
+    }
+
+    public void resetUpdateArray() {
+        mUpdateArray = null;
+    }
+}

src/net/micode/notes/gtask/remote/GTaskManager.java

@@ -0,0 +1,800 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.gtask.remote;
+
+import android.app.Activity;
+import android.content.ContentResolver;
+import android.content.ContentUris;
+import android.content.ContentValues;
+import android.content.Context;
+import android.database.Cursor;
+import android.util.Log;
+
+import net.micode.notes.R;
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.DataColumns;
+import net.micode.notes.data.Notes.NoteColumns;
+import net.micode.notes.gtask.data.MetaData;
+import net.micode.notes.gtask.data.Node;
+import net.micode.notes.gtask.data.SqlNote;
+import net.micode.notes.gtask.data.Task;
+import net.micode.notes.gtask.data.TaskList;
+import net.micode.notes.gtask.exception.ActionFailureException;
+import net.micode.notes.gtask.exception.NetworkFailureException;
+import net.micode.notes.tool.DataUtils;
+import net.micode.notes.tool.GTaskStringUtils;
+
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.Map;
+
+
+public class GTaskManager {
+    private static final String TAG = GTaskManager.class.getSimpleName();
+
+    public static final int STATE_SUCCESS = 0;
+
+    public static final int STATE_NETWORK_ERROR = 1;
+
+    public static final int STATE_INTERNAL_ERROR = 2;
+
+    public static final int STATE_SYNC_IN_PROGRESS = 3;
+
+    public static final int STATE_SYNC_CANCELLED = 4;
+
+    private static GTaskManager mInstance = null;
+
+    private Activity mActivity;
+
+    private Context mContext;
+
+    private ContentResolver mContentResolver;
+
+    private boolean mSyncing;
+
+    private boolean mCancelled;
+
+    private HashMap<String, TaskList> mGTaskListHashMap;
+
+    private HashMap<String, Node> mGTaskHashMap;
+
+    private HashMap<String, MetaData> mMetaHashMap;
+
+    private TaskList mMetaList;
+
+    private HashSet<Long> mLocalDeleteIdMap;
+
+    private HashMap<String, Long> mGidToNid;
+
+    private HashMap<Long, String> mNidToGid;
+
+    private GTaskManager() {
+        mSyncing = false;
+        mCancelled = false;
+        mGTaskListHashMap = new HashMap<String, TaskList>();
+        mGTaskHashMap = new HashMap<String, Node>();
+        mMetaHashMap = new HashMap<String, MetaData>();
+        mMetaList = null;
+        mLocalDeleteIdMap = new HashSet<Long>();
+        mGidToNid = new HashMap<String, Long>();
+        mNidToGid = new HashMap<Long, String>();
+    }
+
+    public static synchronized GTaskManager getInstance() {
+        if (mInstance == null) {
+            mInstance = new GTaskManager();
+        }
+        return mInstance;
+    }
+
+    public synchronized void setActivityContext(Activity activity) {
+        // used for getting authtoken
+        mActivity = activity;
+    }
+
+    public int sync(Context context, GTaskASyncTask asyncTask) {
+        if (mSyncing) {
+            Log.d(TAG, "Sync is in progress");
+            return STATE_SYNC_IN_PROGRESS;
+        }
+        mContext = context;
+        mContentResolver = mContext.getContentResolver();
+        mSyncing = true;
+        mCancelled = false;
+        mGTaskListHashMap.clear();
+        mGTaskHashMap.clear();
+        mMetaHashMap.clear();
+        mLocalDeleteIdMap.clear();
+        mGidToNid.clear();
+        mNidToGid.clear();
+
+        try {
+            GTaskClient client = GTaskClient.getInstance();
+            client.resetUpdateArray();
+
+            // login google task
+            if (!mCancelled) {
+                if (!client.login(mActivity)) {
+                    throw new NetworkFailureException("login google task failed");
+                }
+            }
+
+            // get the task list from google
+            asyncTask.publishProgess(mContext.getString(R.string.sync_progress_init_list));
+            initGTaskList();
+
+            // do content sync work
+            asyncTask.publishProgess(mContext.getString(R.string.sync_progress_syncing));
+            syncContent();
+        } catch (NetworkFailureException e) {
+            Log.e(TAG, e.toString());
+            return STATE_NETWORK_ERROR;
+        } catch (ActionFailureException e) {
+            Log.e(TAG, e.toString());
+            return STATE_INTERNAL_ERROR;
+        } catch (Exception e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            return STATE_INTERNAL_ERROR;
+        } finally {
+            mGTaskListHashMap.clear();
+            mGTaskHashMap.clear();
+            mMetaHashMap.clear();
+            mLocalDeleteIdMap.clear();
+            mGidToNid.clear();
+            mNidToGid.clear();
+            mSyncing = false;
+        }
+
+        return mCancelled ? STATE_SYNC_CANCELLED : STATE_SUCCESS;
+    }
+
+    private void initGTaskList() throws NetworkFailureException {
+        if (mCancelled)
+            return;
+        GTaskClient client = GTaskClient.getInstance();
+        try {
+            JSONArray jsTaskLists = client.getTaskLists();
+
+            // init meta list first
+            mMetaList = null;
+            for (int i = 0; i < jsTaskLists.length(); i++) {
+                JSONObject object = jsTaskLists.getJSONObject(i);
+                String gid = object.getString(GTaskStringUtils.GTASK_JSON_ID);
+                String name = object.getString(GTaskStringUtils.GTASK_JSON_NAME);
+
+                if (name
+                        .equals(GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_META)) {
+                    mMetaList = new TaskList();
+                    mMetaList.setContentByRemoteJSON(object);
+
+                    // load meta data
+                    JSONArray jsMetas = client.getTaskList(gid);
+                    for (int j = 0; j < jsMetas.length(); j++) {
+                        object = (JSONObject) jsMetas.getJSONObject(j);
+                        MetaData metaData = new MetaData();
+                        metaData.setContentByRemoteJSON(object);
+                        if (metaData.isWorthSaving()) {
+                            mMetaList.addChildTask(metaData);
+                            if (metaData.getGid() != null) {
+                                mMetaHashMap.put(metaData.getRelatedGid(), metaData);
+                            }
+                        }
+                    }
+                }
+            }
+
+            // create meta list if not existed
+            if (mMetaList == null) {
+                mMetaList = new TaskList();
+                mMetaList.setName(GTaskStringUtils.MIUI_FOLDER_PREFFIX
+                        + GTaskStringUtils.FOLDER_META);
+                GTaskClient.getInstance().createTaskList(mMetaList);
+            }
+
+            // init task list
+            for (int i = 0; i < jsTaskLists.length(); i++) {
+                JSONObject object = jsTaskLists.getJSONObject(i);
+                String gid = object.getString(GTaskStringUtils.GTASK_JSON_ID);
+                String name = object.getString(GTaskStringUtils.GTASK_JSON_NAME);
+
+                if (name.startsWith(GTaskStringUtils.MIUI_FOLDER_PREFFIX)
+                        && !name.equals(GTaskStringUtils.MIUI_FOLDER_PREFFIX
+                                + GTaskStringUtils.FOLDER_META)) {
+                    TaskList tasklist = new TaskList();
+                    tasklist.setContentByRemoteJSON(object);
+                    mGTaskListHashMap.put(gid, tasklist);
+                    mGTaskHashMap.put(gid, tasklist);
+
+                    // load tasks
+                    JSONArray jsTasks = client.getTaskList(gid);
+                    for (int j = 0; j < jsTasks.length(); j++) {
+                        object = (JSONObject) jsTasks.getJSONObject(j);
+                        gid = object.getString(GTaskStringUtils.GTASK_JSON_ID);
+                        Task task = new Task();
+                        task.setContentByRemoteJSON(object);
+                        if (task.isWorthSaving()) {
+                            task.setMetaInfo(mMetaHashMap.get(gid));
+                            tasklist.addChildTask(task);
+                            mGTaskHashMap.put(gid, task);
+                        }
+                    }
+                }
+            }
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("initGTaskList: handing JSONObject failed");
+        }
+    }
+
+    private void syncContent() throws NetworkFailureException {
+        int syncType;
+        Cursor c = null;
+        String gid;
+        Node node;
+
+        mLocalDeleteIdMap.clear();
+
+        if (mCancelled) {
+            return;
+        }
+
+        // for local deleted note
+        try {
+            c = mContentResolver.query(Notes.CONTENT_NOTE_URI, SqlNote.PROJECTION_NOTE,
+                    "(type<>? AND parent_id=?)", new String[] {
+                            String.valueOf(Notes.TYPE_SYSTEM), String.valueOf(Notes.ID_TRASH_FOLER)
+                    }, null);
+            if (c != null) {
+                while (c.moveToNext()) {
+                    gid = c.getString(SqlNote.GTASK_ID_COLUMN);
+                    node = mGTaskHashMap.get(gid);
+                    if (node != null) {
+                        mGTaskHashMap.remove(gid);
+                        doContentSync(Node.SYNC_ACTION_DEL_REMOTE, node, c);
+                    }
+
+                    mLocalDeleteIdMap.add(c.getLong(SqlNote.ID_COLUMN));
+                }
+            } else {
+                Log.w(TAG, "failed to query trash folder");
+            }
+        } finally {
+            if (c != null) {
+                c.close();
+                c = null;
+            }
+        }
+
+        // sync folder first
+        syncFolder();
+
+        // for note existing in database
+        try {
+            c = mContentResolver.query(Notes.CONTENT_NOTE_URI, SqlNote.PROJECTION_NOTE,
+                    "(type=? AND parent_id<>?)", new String[] {
+                            String.valueOf(Notes.TYPE_NOTE), String.valueOf(Notes.ID_TRASH_FOLER)
+                    }, NoteColumns.TYPE + " DESC");
+            if (c != null) {
+                while (c.moveToNext()) {
+                    gid = c.getString(SqlNote.GTASK_ID_COLUMN);
+                    node = mGTaskHashMap.get(gid);
+                    if (node != null) {
+                        mGTaskHashMap.remove(gid);
+                        mGidToNid.put(gid, c.getLong(SqlNote.ID_COLUMN));
+                        mNidToGid.put(c.getLong(SqlNote.ID_COLUMN), gid);
+                        syncType = node.getSyncAction(c);
+                    } else {
+                        if (c.getString(SqlNote.GTASK_ID_COLUMN).trim().length() == 0) {
+                            // local add
+                            syncType = Node.SYNC_ACTION_ADD_REMOTE;
+                        } else {
+                            // remote delete
+                            syncType = Node.SYNC_ACTION_DEL_LOCAL;
+                        }
+                    }
+                    doContentSync(syncType, node, c);
+                }
+            } else {
+                Log.w(TAG, "failed to query existing note in database");
+            }
+
+        } finally {
+            if (c != null) {
+                c.close();
+                c = null;
+            }
+        }
+
+        // go through remaining items
+        Iterator<Map.Entry<String, Node>> iter = mGTaskHashMap.entrySet().iterator();
+        while (iter.hasNext()) {
+            Map.Entry<String, Node> entry = iter.next();
+            node = entry.getValue();
+            doContentSync(Node.SYNC_ACTION_ADD_LOCAL, node, null);
+        }
+
+        // mCancelled can be set by another thread, so we neet to check one by
+        // one
+        // clear local delete table
+        if (!mCancelled) {
+            if (!DataUtils.batchDeleteNotes(mContentResolver, mLocalDeleteIdMap)) {
+                throw new ActionFailureException("failed to batch-delete local deleted notes");
+            }
+        }
+
+        // refresh local sync id
+        if (!mCancelled) {
+            GTaskClient.getInstance().commitUpdate();
+            refreshLocalSyncId();
+        }
+
+    }
+
+    private void syncFolder() throws NetworkFailureException {
+        Cursor c = null;
+        String gid;
+        Node node;
+        int syncType;
+
+        if (mCancelled) {
+            return;
+        }
+
+        // for root folder
+        try {
+            c = mContentResolver.query(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI,
+                    Notes.ID_ROOT_FOLDER), SqlNote.PROJECTION_NOTE, null, null, null);
+            if (c != null) {
+                c.moveToNext();
+                gid = c.getString(SqlNote.GTASK_ID_COLUMN);
+                node = mGTaskHashMap.get(gid);
+                if (node != null) {
+                    mGTaskHashMap.remove(gid);
+                    mGidToNid.put(gid, (long) Notes.ID_ROOT_FOLDER);
+                    mNidToGid.put((long) Notes.ID_ROOT_FOLDER, gid);
+                    // for system folder, only update remote name if necessary
+                    if (!node.getName().equals(
+                            GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_DEFAULT))
+                        doContentSync(Node.SYNC_ACTION_UPDATE_REMOTE, node, c);
+                } else {
+                    doContentSync(Node.SYNC_ACTION_ADD_REMOTE, node, c);
+                }
+            } else {
+                Log.w(TAG, "failed to query root folder");
+            }
+        } finally {
+            if (c != null) {
+                c.close();
+                c = null;
+            }
+        }
+
+        // for call-note folder
+        try {
+            c = mContentResolver.query(Notes.CONTENT_NOTE_URI, SqlNote.PROJECTION_NOTE, "(_id=?)",
+                    new String[] {
+                        String.valueOf(Notes.ID_CALL_RECORD_FOLDER)
+                    }, null);
+            if (c != null) {
+                if (c.moveToNext()) {
+                    gid = c.getString(SqlNote.GTASK_ID_COLUMN);
+                    node = mGTaskHashMap.get(gid);
+                    if (node != null) {
+                        mGTaskHashMap.remove(gid);
+                        mGidToNid.put(gid, (long) Notes.ID_CALL_RECORD_FOLDER);
+                        mNidToGid.put((long) Notes.ID_CALL_RECORD_FOLDER, gid);
+                        // for system folder, only update remote name if
+                        // necessary
+                        if (!node.getName().equals(
+                                GTaskStringUtils.MIUI_FOLDER_PREFFIX
+                                        + GTaskStringUtils.FOLDER_CALL_NOTE))
+                            doContentSync(Node.SYNC_ACTION_UPDATE_REMOTE, node, c);
+                    } else {
+                        doContentSync(Node.SYNC_ACTION_ADD_REMOTE, node, c);
+                    }
+                }
+            } else {
+                Log.w(TAG, "failed to query call note folder");
+            }
+        } finally {
+            if (c != null) {
+                c.close();
+                c = null;
+            }
+        }
+
+        // for local existing folders
+        try {
+            c = mContentResolver.query(Notes.CONTENT_NOTE_URI, SqlNote.PROJECTION_NOTE,
+                    "(type=? AND parent_id<>?)", new String[] {
+                            String.valueOf(Notes.TYPE_FOLDER), String.valueOf(Notes.ID_TRASH_FOLER)
+                    }, NoteColumns.TYPE + " DESC");
+            if (c != null) {
+                while (c.moveToNext()) {
+                    gid = c.getString(SqlNote.GTASK_ID_COLUMN);
+                    node = mGTaskHashMap.get(gid);
+                    if (node != null) {
+                        mGTaskHashMap.remove(gid);
+                        mGidToNid.put(gid, c.getLong(SqlNote.ID_COLUMN));
+                        mNidToGid.put(c.getLong(SqlNote.ID_COLUMN), gid);
+                        syncType = node.getSyncAction(c);
+                    } else {
+                        if (c.getString(SqlNote.GTASK_ID_COLUMN).trim().length() == 0) {
+                            // local add
+                            syncType = Node.SYNC_ACTION_ADD_REMOTE;
+                        } else {
+                            // remote delete
+                            syncType = Node.SYNC_ACTION_DEL_LOCAL;
+                        }
+                    }
+                    doContentSync(syncType, node, c);
+                }
+            } else {
+                Log.w(TAG, "failed to query existing folder");
+            }
+        } finally {
+            if (c != null) {
+                c.close();
+                c = null;
+            }
+        }
+
+        // for remote add folders
+        Iterator<Map.Entry<String, TaskList>> iter = mGTaskListHashMap.entrySet().iterator();
+        while (iter.hasNext()) {
+            Map.Entry<String, TaskList> entry = iter.next();
+            gid = entry.getKey();
+            node = entry.getValue();
+            if (mGTaskHashMap.containsKey(gid)) {
+                mGTaskHashMap.remove(gid);
+                doContentSync(Node.SYNC_ACTION_ADD_LOCAL, node, null);
+            }
+        }
+
+        if (!mCancelled)
+            GTaskClient.getInstance().commitUpdate();
+    }
+
+    private void doContentSync(int syncType, Node node, Cursor c) throws NetworkFailureException {
+        if (mCancelled) {
+            return;
+        }
+
+        MetaData meta;
+        switch (syncType) {
+            case Node.SYNC_ACTION_ADD_LOCAL:
+                addLocalNode(node);
+                break;
+            case Node.SYNC_ACTION_ADD_REMOTE:
+                addRemoteNode(node, c);
+                break;
+            case Node.SYNC_ACTION_DEL_LOCAL:
+                meta = mMetaHashMap.get(c.getString(SqlNote.GTASK_ID_COLUMN));
+                if (meta != null) {
+                    GTaskClient.getInstance().deleteNode(meta);
+                }
+                mLocalDeleteIdMap.add(c.getLong(SqlNote.ID_COLUMN));
+                break;
+            case Node.SYNC_ACTION_DEL_REMOTE:
+                meta = mMetaHashMap.get(node.getGid());
+                if (meta != null) {
+                    GTaskClient.getInstance().deleteNode(meta);
+                }
+                GTaskClient.getInstance().deleteNode(node);
+                break;
+            case Node.SYNC_ACTION_UPDATE_LOCAL:
+                updateLocalNode(node, c);
+                break;
+            case Node.SYNC_ACTION_UPDATE_REMOTE:
+                updateRemoteNode(node, c);
+                break;
+            case Node.SYNC_ACTION_UPDATE_CONFLICT:
+                // merging both modifications maybe a good idea
+                // right now just use local update simply
+                updateRemoteNode(node, c);
+                break;
+            case Node.SYNC_ACTION_NONE:
+                break;
+            case Node.SYNC_ACTION_ERROR:
+            default:
+                throw new ActionFailureException("unkown sync action type");
+        }
+    }
+
+    private void addLocalNode(Node node) throws NetworkFailureException {
+        if (mCancelled) {
+            return;
+        }
+
+        SqlNote sqlNote;
+        if (node instanceof TaskList) {
+            if (node.getName().equals(
+                    GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_DEFAULT)) {
+                sqlNote = new SqlNote(mContext, Notes.ID_ROOT_FOLDER);
+            } else if (node.getName().equals(
+                    GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_CALL_NOTE)) {
+                sqlNote = new SqlNote(mContext, Notes.ID_CALL_RECORD_FOLDER);
+            } else {
+                sqlNote = new SqlNote(mContext);
+                sqlNote.setContent(node.getLocalJSONFromContent());
+                sqlNote.setParentId(Notes.ID_ROOT_FOLDER);
+            }
+        } else {
+            sqlNote = new SqlNote(mContext);
+            JSONObject js = node.getLocalJSONFromContent();
+            try {
+                if (js.has(GTaskStringUtils.META_HEAD_NOTE)) {
+                    JSONObject note = js.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
+                    if (note.has(NoteColumns.ID)) {
+                        long id = note.getLong(NoteColumns.ID);
+                        if (DataUtils.existInNoteDatabase(mContentResolver, id)) {
+                            // the id is not available, have to create a new one
+                            note.remove(NoteColumns.ID);
+                        }
+                    }
+                }
+
+                if (js.has(GTaskStringUtils.META_HEAD_DATA)) {
+                    JSONArray dataArray = js.getJSONArray(GTaskStringUtils.META_HEAD_DATA);
+                    for (int i = 0; i < dataArray.length(); i++) {
+                        JSONObject data = dataArray.getJSONObject(i);
+                        if (data.has(DataColumns.ID)) {
+                            long dataId = data.getLong(DataColumns.ID);
+                            if (DataUtils.existInDataDatabase(mContentResolver, dataId)) {
+                                // the data id is not available, have to create
+                                // a new one
+                                data.remove(DataColumns.ID);
+                            }
+                        }
+                    }
+
+                }
+            } catch (JSONException e) {
+                Log.w(TAG, e.toString());
+                e.printStackTrace();
+            }
+            sqlNote.setContent(js);
+
+            Long parentId = mGidToNid.get(((Task) node).getParent().getGid());
+            if (parentId == null) {
+                Log.e(TAG, "cannot find task's parent id locally");
+                throw new ActionFailureException("cannot add local node");
+            }
+            sqlNote.setParentId(parentId.longValue());
+        }
+
+        // create the local node
+        sqlNote.setGtaskId(node.getGid());
+        sqlNote.commit(false);
+
+        // update gid-nid mapping
+        mGidToNid.put(node.getGid(), sqlNote.getId());
+        mNidToGid.put(sqlNote.getId(), node.getGid());
+
+        // update meta
+        updateRemoteMeta(node.getGid(), sqlNote);
+    }
+
+    private void updateLocalNode(Node node, Cursor c) throws NetworkFailureException {
+        if (mCancelled) {
+            return;
+        }
+
+        SqlNote sqlNote;
+        // update the note locally
+        sqlNote = new SqlNote(mContext, c);
+        sqlNote.setContent(node.getLocalJSONFromContent());
+
+        Long parentId = (node instanceof Task) ? mGidToNid.get(((Task) node).getParent().getGid())
+                : new Long(Notes.ID_ROOT_FOLDER);
+        if (parentId == null) {
+            Log.e(TAG, "cannot find task's parent id locally");
+            throw new ActionFailureException("cannot update local node");
+        }
+        sqlNote.setParentId(parentId.longValue());
+        sqlNote.commit(true);
+
+        // update meta info
+        updateRemoteMeta(node.getGid(), sqlNote);
+    }
+
+    private void addRemoteNode(Node node, Cursor c) throws NetworkFailureException {
+        if (mCancelled) {
+            return;
+        }
+
+        SqlNote sqlNote = new SqlNote(mContext, c);
+        Node n;
+
+        // update remotely
+        if (sqlNote.isNoteType()) {
+            Task task = new Task();
+            task.setContentByLocalJSON(sqlNote.getContent());
+
+            String parentGid = mNidToGid.get(sqlNote.getParentId());
+            if (parentGid == null) {
+                Log.e(TAG, "cannot find task's parent tasklist");
+                throw new ActionFailureException("cannot add remote task");
+            }
+            mGTaskListHashMap.get(parentGid).addChildTask(task);
+
+            GTaskClient.getInstance().createTask(task);
+            n = (Node) task;
+
+            // add meta
+            updateRemoteMeta(task.getGid(), sqlNote);
+        } else {
+            TaskList tasklist = null;
+
+            // we need to skip folder if it has already existed
+            String folderName = GTaskStringUtils.MIUI_FOLDER_PREFFIX;
+            if (sqlNote.getId() == Notes.ID_ROOT_FOLDER)
+                folderName += GTaskStringUtils.FOLDER_DEFAULT;
+            else if (sqlNote.getId() == Notes.ID_CALL_RECORD_FOLDER)
+                folderName += GTaskStringUtils.FOLDER_CALL_NOTE;
+            else
+                folderName += sqlNote.getSnippet();
+
+            Iterator<Map.Entry<String, TaskList>> iter = mGTaskListHashMap.entrySet().iterator();
+            while (iter.hasNext()) {
+                Map.Entry<String, TaskList> entry = iter.next();
+                String gid = entry.getKey();
+                TaskList list = entry.getValue();
+
+                if (list.getName().equals(folderName)) {
+                    tasklist = list;
+                    if (mGTaskHashMap.containsKey(gid)) {
+                        mGTaskHashMap.remove(gid);
+                    }
+                    break;
+                }
+            }
+
+            // no match we can add now
+            if (tasklist == null) {
+                tasklist = new TaskList();
+                tasklist.setContentByLocalJSON(sqlNote.getContent());
+                GTaskClient.getInstance().createTaskList(tasklist);
+                mGTaskListHashMap.put(tasklist.getGid(), tasklist);
+            }
+            n = (Node) tasklist;
+        }
+
+        // update local note
+        sqlNote.setGtaskId(n.getGid());
+        sqlNote.commit(false);
+        sqlNote.resetLocalModified();
+        sqlNote.commit(true);
+
+        // gid-id mapping
+        mGidToNid.put(n.getGid(), sqlNote.getId());
+        mNidToGid.put(sqlNote.getId(), n.getGid());
+    }
+
+    private void updateRemoteNode(Node node, Cursor c) throws NetworkFailureException {
+        if (mCancelled) {
+            return;
+        }
+
+        SqlNote sqlNote = new SqlNote(mContext, c);
+
+        // update remotely
+        node.setContentByLocalJSON(sqlNote.getContent());
+        GTaskClient.getInstance().addUpdateNode(node);
+
+        // update meta
+        updateRemoteMeta(node.getGid(), sqlNote);
+
+        // move task if necessary
+        if (sqlNote.isNoteType()) {
+            Task task = (Task) node;
+            TaskList preParentList = task.getParent();
+
+            String curParentGid = mNidToGid.get(sqlNote.getParentId());
+            if (curParentGid == null) {
+                Log.e(TAG, "cannot find task's parent tasklist");
+                throw new ActionFailureException("cannot update remote task");
+            }
+            TaskList curParentList = mGTaskListHashMap.get(curParentGid);
+
+            if (preParentList != curParentList) {
+                preParentList.removeChildTask(task);
+                curParentList.addChildTask(task);
+                GTaskClient.getInstance().moveTask(task, preParentList, curParentList);
+            }
+        }
+
+        // clear local modified flag
+        sqlNote.resetLocalModified();
+        sqlNote.commit(true);
+    }
+
+    private void updateRemoteMeta(String gid, SqlNote sqlNote) throws NetworkFailureException {
+        if (sqlNote != null && sqlNote.isNoteType()) {
+            MetaData metaData = mMetaHashMap.get(gid);
+            if (metaData != null) {
+                metaData.setMeta(gid, sqlNote.getContent());
+                GTaskClient.getInstance().addUpdateNode(metaData);
+            } else {
+                metaData = new MetaData();
+                metaData.setMeta(gid, sqlNote.getContent());
+                mMetaList.addChildTask(metaData);
+                mMetaHashMap.put(gid, metaData);
+                GTaskClient.getInstance().createTask(metaData);
+            }
+        }
+    }
+
+    private void refreshLocalSyncId() throws NetworkFailureException {
+        if (mCancelled) {
+            return;
+        }
+
+        // get the latest gtask list
+        mGTaskHashMap.clear();
+        mGTaskListHashMap.clear();
+        mMetaHashMap.clear();
+        initGTaskList();
+
+        Cursor c = null;
+        try {
+            c = mContentResolver.query(Notes.CONTENT_NOTE_URI, SqlNote.PROJECTION_NOTE,
+                    "(type<>? AND parent_id<>?)", new String[] {
+                            String.valueOf(Notes.TYPE_SYSTEM), String.valueOf(Notes.ID_TRASH_FOLER)
+                    }, NoteColumns.TYPE + " DESC");
+            if (c != null) {
+                while (c.moveToNext()) {
+                    String gid = c.getString(SqlNote.GTASK_ID_COLUMN);
+                    Node node = mGTaskHashMap.get(gid);
+                    if (node != null) {
+                        mGTaskHashMap.remove(gid);
+                        ContentValues values = new ContentValues();
+                        values.put(NoteColumns.SYNC_ID, node.getLastModified());
+                        mContentResolver.update(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI,
+                                c.getLong(SqlNote.ID_COLUMN)), values, null, null);
+                    } else {
+                        Log.e(TAG, "something is missed");
+                        throw new ActionFailureException(
+                                "some local items don't have gid after sync");
+                    }
+                }
+            } else {
+                Log.w(TAG, "failed to query local note to refresh sync id");
+            }
+        } finally {
+            if (c != null) {
+                c.close();
+                c = null;
+            }
+        }
+    }
+
+    public String getSyncAccount() {
+        return GTaskClient.getInstance().getSyncAccount().name;
+    }
+
+    public void cancelSync() {
+        mCancelled = true;
+    }
+}

src/net/micode/notes/gtask/remote/GTaskSyncService.java

@@ -0,0 +1,128 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.gtask.remote;
+
+import android.app.Activity;
+import android.app.Service;
+import android.content.Context;
+import android.content.Intent;
+import android.os.Bundle;
+import android.os.IBinder;
+
+public class GTaskSyncService extends Service {
+    public final static String ACTION_STRING_NAME = "sync_action_type";
+
+    public final static int ACTION_START_SYNC = 0;
+
+    public final static int ACTION_CANCEL_SYNC = 1;
+
+    public final static int ACTION_INVALID = 2;
+
+    public final static String GTASK_SERVICE_BROADCAST_NAME = "net.micode.notes.gtask.remote.gtask_sync_service";
+
+    public final static String GTASK_SERVICE_BROADCAST_IS_SYNCING = "isSyncing";
+
+    public final static String GTASK_SERVICE_BROADCAST_PROGRESS_MSG = "progressMsg";
+
+    private static GTaskASyncTask mSyncTask = null;
+
+    private static String mSyncProgress = "";
+
+    private void startSync() {
+        if (mSyncTask == null) {
+            mSyncTask = new GTaskASyncTask(this, new GTaskASyncTask.OnCompleteListener() {
+                public void onComplete() {
+                    mSyncTask = null;
+                    sendBroadcast("");
+                    stopSelf();
+                }
+            });
+            sendBroadcast("");
+            mSyncTask.execute();
+        }
+    }
+
+    private void cancelSync() {
+        if (mSyncTask != null) {
+            mSyncTask.cancelSync();
+        }
+    }
+
+    @Override
+    public void onCreate() {
+        mSyncTask = null;
+    }
+
+    @Override
+    public int onStartCommand(Intent intent, int flags, int startId) {
+        Bundle bundle = intent.getExtras();
+        if (bundle != null && bundle.containsKey(ACTION_STRING_NAME)) {
+            switch (bundle.getInt(ACTION_STRING_NAME, ACTION_INVALID)) {
+                case ACTION_START_SYNC:
+                    startSync();
+                    break;
+                case ACTION_CANCEL_SYNC:
+                    cancelSync();
+                    break;
+                default:
+                    break;
+            }
+            return START_STICKY;
+        }
+        return super.onStartCommand(intent, flags, startId);
+    }
+
+    @Override
+    public void onLowMemory() {
+        if (mSyncTask != null) {
+            mSyncTask.cancelSync();
+        }
+    }
+
+    public IBinder onBind(Intent intent) {
+        return null;
+    }
+
+    public void sendBroadcast(String msg) {
+        mSyncProgress = msg;
+        Intent intent = new Intent(GTASK_SERVICE_BROADCAST_NAME);
+        intent.putExtra(GTASK_SERVICE_BROADCAST_IS_SYNCING, mSyncTask != null);
+        intent.putExtra(GTASK_SERVICE_BROADCAST_PROGRESS_MSG, msg);
+        sendBroadcast(intent);
+    }
+
+    public static void startSync(Activity activity) {
+        GTaskManager.getInstance().setActivityContext(activity);
+        Intent intent = new Intent(activity, GTaskSyncService.class);
+        intent.putExtra(GTaskSyncService.ACTION_STRING_NAME, GTaskSyncService.ACTION_START_SYNC);
+        activity.startService(intent);
+    }
+
+    public static void cancelSync(Context context) {
+        Intent intent = new Intent(context, GTaskSyncService.class);
+        intent.putExtra(GTaskSyncService.ACTION_STRING_NAME, GTaskSyncService.ACTION_CANCEL_SYNC);
+        context.startService(intent);
+    }
+
+    public static boolean isSyncing() {
+        return mSyncTask != null;
+    }
+
+    public static String getProgressString() {
+        return mSyncProgress;
+    }
+}

src/net/micode/notes/model/Note.java

@@ -0,0 +1,250 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0 
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// 定义了一个名为Note的类，用于处理便签数据
+
+package net.micode.notes.model;
+import android.content.ContentProviderOperation;
+import android.content.ContentProviderResult;
+import android.content.ContentUris;
+import android.content.ContentValues;
+import android.content.Context;
+import android.content.OperationApplicationException;
+import android.net.Uri;
+import android.os.RemoteException;
+import android.util.Log;
+
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.CallNote;
+import net.micode.notes.data.Notes.DataColumns;
+import net.micode.notes.data.Notes.NoteColumns;
+import net.micode.notes.data.Notes.TextNote;
+
+import java.util.ArrayList;
+
+public class Note {
+    private ContentValues mNoteDiffValues; // 用于存储便签数据变化的ContentValues对象
+    private NoteData mNoteData; // 用于存储便签数据的私有类NoteData的对象
+    private static final String TAG = "Note"; // 用于日志标记的TAG
+
+    /**
+     * Create a new note id for adding a new note to databases
+     */
+    public static synchronized long getNewNoteId(Context context, long folderId) {
+        // 创建一个新的便签ID，用于将新的便签添加到数据库中
+        ContentValues values = new ContentValues();
+        long createdTime = System.currentTimeMillis();
+        values.put(NoteColumns.CREATED_DATE, createdTime);
+        values.put(NoteColumns.MODIFIED_DATE, createdTime);
+        values.put(NoteColumns.TYPE, Notes.TYPE_NOTE);
+        values.put(NoteColumns.LOCAL_MODIFIED, 1);
+        values.put(NoteColumns.PARENT_ID, folderId);
+        Uri uri = context.getContentResolver().insert(Notes.CONTENT_NOTE_URI, values);
+
+        long noteId = 0;
+        try {
+            noteId = Long.valueOf(uri.getPathSegments().get(1));
+        } catch (NumberFormatException e) {
+            Log.e(TAG, "Get note id error :" + e.toString());
+            noteId = 0;
+        }
+        if (noteId == -1) {
+            throw new IllegalStateException("Wrong note id:" + noteId);
+        }
+        return noteId;
+    }
+
+    public Note() {
+        mNoteDiffValues = new ContentValues();
+        mNoteData = new NoteData();
+    }
+
+    public void setNoteValue(String key, String value) {
+        // 设置便签的值
+        mNoteDiffValues.put(key, value);
+        mNoteDiffValues.put(NoteColumns.LOCAL_MODIFIED, 1);
+        mNoteDiffValues.put(NoteColumns.MODIFIED_DATE, System.currentTimeMillis());
+    }
+
+    public void setTextData(String key, String value) {
+        // 设置文本数据
+        mNoteData.setTextData(key, value);
+    }
+
+    public void setTextDataId(long id) {
+        // 设置文本数据ID
+        mNoteData.setTextDataId(id);
+    }
+
+    public long getTextDataId() {
+        // 获取文本数据ID
+        return mNoteData.mTextDataId;
+    }
+
+    public void setCallDataId(long id) {
+        // 设置通话数据ID
+        mNoteData.setCallDataId(id);
+    }
+
+    public void setCallData(String key, String value) {
+        // 设置通话数据
+        mNoteData.setCallData(key, value);
+    }
+
+    public boolean isLocalModified() {
+        // 检查是否有本地修改
+        return mNoteDiffValues.size() > 0 || mNoteData.isLocalModified();
+    }
+
+    public boolean syncNote(Context context, long noteId) {
+        // 同步便签数据到数据库
+        if (noteId <= 0) {
+            throw new IllegalArgumentException("Wrong note id:" + noteId);
+        }
+
+        if (!isLocalModified()) {
+            return true;
+        }
+
+        // 更新便签数据
+        if (context.getContentResolver().update(
+                ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), mNoteDiffValues, null,
+                null) == 0) {
+            Log.e(TAG, "Update note error, should not happen");
+            // Do not return, fall through
+        }
+        mNoteDiffValues.clear();
+
+        // 更新便签数据信息
+        if (mNoteData.isLocalModified()
+                && (mNoteData.pushIntoContentResolver(context, noteId) == null)) {
+            return false;
+        }
+
+        return true;
+    }
+
+    private class NoteData {
+        private long mTextDataId;
+        private ContentValues mTextDataValues;
+        private long mCallDataId;
+        private ContentValues mCallDataValues;
+        private static final String TAG = "NoteData";
+
+        public NoteData() {
+            mTextDataValues = new ContentValues();
+            mCallDataValues = new ContentValues();
+            mTextDataId = 0;
+            mCallDataId = 0;
+        }
+
+        boolean isLocalModified() {
+            // 检查是否有本地修改
+            return mTextDataValues.size() > 0 || mCallDataValues.size() > 0;
+        }
+
+        void setTextDataId(long id) {
+            // 设置文本数据ID
+            if(id <= 0) {
+                throw new IllegalArgumentException("Text data id should larger than 0");
+            }
+            mTextDataId = id;
+        }
+
+        void setCallDataId(long id) {
+            // 设置通话数据ID
+            if (id <= 0) {
+                throw new IllegalArgumentException("Call data id should larger than 0");
+            }
+            mCallDataId = id;
+        }
+
+        void setCallData(String key, String value) {
+            // 设置通话数据
+            mCallDataValues.put(key, value);
+            mNoteDiffValues.put(NoteColumns.LOCAL_MODIFIED, 1);
+            mNoteDiffValues.put(NoteColumns.MODIFIED_DATE, System.currentTimeMillis());
+        }
+
+        void setTextData(String key, String value) {
+            // 设置文本数据
+            mTextDataValues.put(key, value);
+            mNoteDiffValues.put(NoteColumns.LOCAL_MODIFIED, 1);
+            mNoteDiffValues.put(NoteColumns.MODIFIED_DATE, System.currentTimeMillis());
+        }
+
+        Uri pushIntoContentResolver(Context context, long noteId) {
+            // 将便签数据推送到内容解析器
+            ArrayList<ContentProviderOperation> operationList = new ArrayList<ContentProviderOperation>();
+            ContentProviderOperation.Builder builder = null;
+
+            if(mTextDataValues.size() > 0) {
+                // 处理文本数据
+                mTextDataValues.put(DataColumns.NOTE_ID, noteId);
+                if (mTextDataId == 0) {
+                    // 插入新的文本数据
+                    Uri uri = context.getContentResolver().insert(Notes.CONTENT_DATA_URI,
+                            mTextDataValues);
+                    try {
+                        setTextDataId(Long.valueOf(uri.getPathSegments().get(1)));
+                    } catch (NumberFormatException e) {
+                        Log.e(TAG, "Insert new text data fail with noteId" + noteId);
+                        mTextDataValues.clear();
+                        return null;
+                    }
+                } else {
+                    // 更新文本数据
+                    builder = ContentProviderOperation.newUpdate(ContentUris.withAppendedId(
+                            Notes.CONTENT_DATA_URI, mTextDataId));
+                    builder.withValues(mTextDataValues);
+                    operationList.add(builder.build());
+                }
+                mTextDataValues.clear();
+            }
+
+            if(mCallDataValues.size() > 0) {
+                // 处理通话数据
+                mCallDataValues.put(DataColumns.NOTE_ID, noteId);
+                if (mCallDataId == 0) {
+                    // 插入新的通话数据
+                    Uri uri = context.getContentResolver().insert(Notes.CONTENT_DATA_URI,
+                            mCallDataValues);
+                    try {
+                        setCallDataId(Long.valueOf(uri.getPathSegments().get(1)));
+                    } catch (NumberFormatException e) {
+                        Log.e(TAG, "Insert new call data fail with noteId" + noteId);
+                        mCallDataValues.clear();
+                        return null;
+                    }
+                } else {
+                    // 更新通话数据
+                    builder = ContentProviderOperation.newUpdate(ContentUris.withAppendedId(
+                            Notes.CONTENT_DATA_URI, mCallDataId));
+                    builder.withValues(mCallDataValues);
+                    operationList.add(builder.build());
+                }
+                mCallDataValues.clear();
+            }
+
+            if (operationList.size() > 0) {
+                try {
+                    // 应用批量操作
+                    ContentProviderResult[] results = context.getContentResolver().applyBatch(
+                            Notes.AUTHORITY, operationList);
+                    return (results == null || results.length == 0 || results[0] == null) ? null
+                            : ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId);
+                } catch (RemoteException e) {
+                    Log.e(TAG, String.format("%s: %s", e.toString(),

src/net/micode/notes/model/WorkingNote.java

@@ -0,0 +1,368 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.model;
+
+import android.appwidget.AppWidgetManager;
+import android.content.ContentUris;
+import android.content.Context;
+import android.database.Cursor;
+import android.text.TextUtils;
+import android.util.Log;
+
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.CallNote;
+import net.micode.notes.data.Notes.DataColumns;
+import net.micode.notes.data.Notes.DataConstants;
+import net.micode.notes.data.Notes.NoteColumns;
+import net.micode.notes.data.Notes.TextNote;
+import net.micode.notes.tool.ResourceParser.NoteBgResources;
+
+
+public class WorkingNote {
+    // Note for the working note
+    private Note mNote;
+    // Note Id
+    private long mNoteId;
+    // Note content
+    private String mContent;
+    // Note mode
+    private int mMode;
+
+    private long mAlertDate;
+
+    private long mModifiedDate;
+
+    private int mBgColorId;
+
+    private int mWidgetId;
+
+    private int mWidgetType;
+
+    private long mFolderId;
+
+    private Context mContext;
+
+    private static final String TAG = "WorkingNote";
+
+    private boolean mIsDeleted;
+
+    private NoteSettingChangedListener mNoteSettingStatusListener;
+
+    public static final String[] DATA_PROJECTION = new String[] {
+            DataColumns.ID,
+            DataColumns.CONTENT,
+            DataColumns.MIME_TYPE,
+            DataColumns.DATA1,
+            DataColumns.DATA2,
+            DataColumns.DATA3,
+            DataColumns.DATA4,
+    };
+
+    public static final String[] NOTE_PROJECTION = new String[] {
+            NoteColumns.PARENT_ID,
+            NoteColumns.ALERTED_DATE,
+            NoteColumns.BG_COLOR_ID,
+            NoteColumns.WIDGET_ID,
+            NoteColumns.WIDGET_TYPE,
+            NoteColumns.MODIFIED_DATE
+    };
+
+    private static final int DATA_ID_COLUMN = 0;
+
+    private static final int DATA_CONTENT_COLUMN = 1;
+
+    private static final int DATA_MIME_TYPE_COLUMN = 2;
+
+    private static final int DATA_MODE_COLUMN = 3;
+
+    private static final int NOTE_PARENT_ID_COLUMN = 0;
+
+    private static final int NOTE_ALERTED_DATE_COLUMN = 1;
+
+    private static final int NOTE_BG_COLOR_ID_COLUMN = 2;
+
+    private static final int NOTE_WIDGET_ID_COLUMN = 3;
+
+    private static final int NOTE_WIDGET_TYPE_COLUMN = 4;
+
+    private static final int NOTE_MODIFIED_DATE_COLUMN = 5;
+
+    // New note construct
+    private WorkingNote(Context context, long folderId) {
+        mContext = context;
+        mAlertDate = 0;
+        mModifiedDate = System.currentTimeMillis();
+        mFolderId = folderId;
+        mNote = new Note();
+        mNoteId = 0;
+        mIsDeleted = false;
+        mMode = 0;
+        mWidgetType = Notes.TYPE_WIDGET_INVALIDE;
+    }
+
+    // Existing note construct
+    private WorkingNote(Context context, long noteId, long folderId) {
+        mContext = context;
+        mNoteId = noteId;
+        mFolderId = folderId;
+        mIsDeleted = false;
+        mNote = new Note();
+        loadNote();
+    }
+
+    private void loadNote() {
+        Cursor cursor = mContext.getContentResolver().query(
+                ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, mNoteId), NOTE_PROJECTION, null,
+                null, null);
+
+        if (cursor != null) {
+            if (cursor.moveToFirst()) {
+                mFolderId = cursor.getLong(NOTE_PARENT_ID_COLUMN);
+                mBgColorId = cursor.getInt(NOTE_BG_COLOR_ID_COLUMN);
+                mWidgetId = cursor.getInt(NOTE_WIDGET_ID_COLUMN);
+                mWidgetType = cursor.getInt(NOTE_WIDGET_TYPE_COLUMN);
+                mAlertDate = cursor.getLong(NOTE_ALERTED_DATE_COLUMN);
+                mModifiedDate = cursor.getLong(NOTE_MODIFIED_DATE_COLUMN);
+            }
+            cursor.close();
+        } else {
+            Log.e(TAG, "No note with id:" + mNoteId);
+            throw new IllegalArgumentException("Unable to find note with id " + mNoteId);
+        }
+        loadNoteData();
+    }
+
+    private void loadNoteData() {
+        Cursor cursor = mContext.getContentResolver().query(Notes.CONTENT_DATA_URI, DATA_PROJECTION,
+                DataColumns.NOTE_ID + "=?", new String[] {
+                    String.valueOf(mNoteId)
+                }, null);
+
+        if (cursor != null) {
+            if (cursor.moveToFirst()) {
+                do {
+                    String type = cursor.getString(DATA_MIME_TYPE_COLUMN);
+                    if (DataConstants.NOTE.equals(type)) {
+                        mContent = cursor.getString(DATA_CONTENT_COLUMN);
+                        mMode = cursor.getInt(DATA_MODE_COLUMN);
+                        mNote.setTextDataId(cursor.getLong(DATA_ID_COLUMN));
+                    } else if (DataConstants.CALL_NOTE.equals(type)) {
+                        mNote.setCallDataId(cursor.getLong(DATA_ID_COLUMN));
+                    } else {
+                        Log.d(TAG, "Wrong note type with type:" + type);
+                    }
+                } while (cursor.moveToNext());
+            }
+            cursor.close();
+        } else {
+            Log.e(TAG, "No data with id:" + mNoteId);
+            throw new IllegalArgumentException("Unable to find note's data with id " + mNoteId);
+        }
+    }
+
+    public static WorkingNote createEmptyNote(Context context, long folderId, int widgetId,
+            int widgetType, int defaultBgColorId) {
+        WorkingNote note = new WorkingNote(context, folderId);
+        note.setBgColorId(defaultBgColorId);
+        note.setWidgetId(widgetId);
+        note.setWidgetType(widgetType);
+        return note;
+    }
+
+    public static WorkingNote load(Context context, long id) {
+        return new WorkingNote(context, id, 0);
+    }
+
+    public synchronized boolean saveNote() {
+        if (isWorthSaving()) {
+            if (!existInDatabase()) {
+                if ((mNoteId = Note.getNewNoteId(mContext, mFolderId)) == 0) {
+                    Log.e(TAG, "Create new note fail with id:" + mNoteId);
+                    return false;
+                }
+            }
+
+            mNote.syncNote(mContext, mNoteId);
+
+            /**
+             * Update widget content if there exist any widget of this note
+             */
+            if (mWidgetId != AppWidgetManager.INVALID_APPWIDGET_ID
+                    && mWidgetType != Notes.TYPE_WIDGET_INVALIDE
+                    && mNoteSettingStatusListener != null) {
+                mNoteSettingStatusListener.onWidgetChanged();
+            }
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    public boolean existInDatabase() {
+        return mNoteId > 0;
+    }
+
+    private boolean isWorthSaving() {
+        if (mIsDeleted || (!existInDatabase() && TextUtils.isEmpty(mContent))
+                || (existInDatabase() && !mNote.isLocalModified())) {
+            return false;
+        } else {
+            return true;
+        }
+    }
+
+    public void setOnSettingStatusChangedListener(NoteSettingChangedListener l) {
+        mNoteSettingStatusListener = l;
+    }
+
+    public void setAlertDate(long date, boolean set) {
+        if (date != mAlertDate) {
+            mAlertDate = date;
+            mNote.setNoteValue(NoteColumns.ALERTED_DATE, String.valueOf(mAlertDate));
+        }
+        if (mNoteSettingStatusListener != null) {
+            mNoteSettingStatusListener.onClockAlertChanged(date, set);
+        }
+    }
+
+    public void markDeleted(boolean mark) {
+        mIsDeleted = mark;
+        if (mWidgetId != AppWidgetManager.INVALID_APPWIDGET_ID
+                && mWidgetType != Notes.TYPE_WIDGET_INVALIDE && mNoteSettingStatusListener != null) {
+                mNoteSettingStatusListener.onWidgetChanged();
+        }
+    }
+
+    public void setBgColorId(int id) {
+        if (id != mBgColorId) {
+            mBgColorId = id;
+            if (mNoteSettingStatusListener != null) {
+                mNoteSettingStatusListener.onBackgroundColorChanged();
+            }
+            mNote.setNoteValue(NoteColumns.BG_COLOR_ID, String.valueOf(id));
+        }
+    }
+
+    public void setCheckListMode(int mode) {
+        if (mMode != mode) {
+            if (mNoteSettingStatusListener != null) {
+                mNoteSettingStatusListener.onCheckListModeChanged(mMode, mode);
+            }
+            mMode = mode;
+            mNote.setTextData(TextNote.MODE, String.valueOf(mMode));
+        }
+    }
+
+    public void setWidgetType(int type) {
+        if (type != mWidgetType) {
+            mWidgetType = type;
+            mNote.setNoteValue(NoteColumns.WIDGET_TYPE, String.valueOf(mWidgetType));
+        }
+    }
+
+    public void setWidgetId(int id) {
+        if (id != mWidgetId) {
+            mWidgetId = id;
+            mNote.setNoteValue(NoteColumns.WIDGET_ID, String.valueOf(mWidgetId));
+        }
+    }
+
+    public void setWorkingText(String text) {
+        if (!TextUtils.equals(mContent, text)) {
+            mContent = text;
+            mNote.setTextData(DataColumns.CONTENT, mContent);
+        }
+    }
+
+    public void convertToCallNote(String phoneNumber, long callDate) {
+        mNote.setCallData(CallNote.CALL_DATE, String.valueOf(callDate));
+        mNote.setCallData(CallNote.PHONE_NUMBER, phoneNumber);
+        mNote.setNoteValue(NoteColumns.PARENT_ID, String.valueOf(Notes.ID_CALL_RECORD_FOLDER));
+    }
+
+    public boolean hasClockAlert() {
+        return (mAlertDate > 0 ? true : false);
+    }
+
+    public String getContent() {
+        return mContent;
+    }
+
+    public long getAlertDate() {
+        return mAlertDate;
+    }
+
+    public long getModifiedDate() {
+        return mModifiedDate;
+    }
+
+    public int getBgColorResId() {
+        return NoteBgResources.getNoteBgResource(mBgColorId);
+    }
+
+    public int getBgColorId() {
+        return mBgColorId;
+    }
+
+    public int getTitleBgResId() {
+        return NoteBgResources.getNoteTitleBgResource(mBgColorId);
+    }
+
+    public int getCheckListMode() {
+        return mMode;
+    }
+
+    public long getNoteId() {
+        return mNoteId;
+    }
+
+    public long getFolderId() {
+        return mFolderId;
+    }
+
+    public int getWidgetId() {
+        return mWidgetId;
+    }
+
+    public int getWidgetType() {
+        return mWidgetType;
+    }
+
+    public interface NoteSettingChangedListener {
+        /**
+         * Called when the background color of current note has just changed
+         */
+        void onBackgroundColorChanged();
+
+        /**
+         * Called when user set clock
+         */
+        void onClockAlertChanged(long date, boolean set);
+
+        /**
+         * Call when user create note from widget
+         */
+        void onWidgetChanged();
+
+        /**
+         * Call when switch between check list mode and normal mode
+         * @param oldMode is previous mode before change
+         * @param newMode is new mode
+         */
+        void onCheckListModeChanged(int oldMode, int newMode);
+    }
+}

src/net/micode/notes/tool/BackupUtils.java

@@ -0,0 +1,344 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.tool;
+
+import android.content.Context;
+import android.database.Cursor;
+import android.os.Environment;
+import android.text.TextUtils;
+import android.text.format.DateFormat;
+import android.util.Log;
+
+import net.micode.notes.R;
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.DataColumns;
+import net.micode.notes.data.Notes.DataConstants;
+import net.micode.notes.data.Notes.NoteColumns;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.PrintStream;
+
+
+public class BackupUtils {
+    private static final String TAG = "BackupUtils";
+    // Singleton stuff
+    private static BackupUtils sInstance;
+
+    public static synchronized BackupUtils getInstance(Context context) {
+        if (sInstance == null) {
+            sInstance = new BackupUtils(context);
+        }
+        return sInstance;
+    }
+
+    /**
+     * Following states are signs to represents backup or restore
+     * status
+     */
+    // Currently, the sdcard is not mounted
+    public static final int STATE_SD_CARD_UNMOUONTED           = 0;
+    // The backup file not exist
+    public static final int STATE_BACKUP_FILE_NOT_EXIST        = 1;
+    // The data is not well formated, may be changed by other programs
+    public static final int STATE_DATA_DESTROIED               = 2;
+    // Some run-time exception which causes restore or backup fails
+    public static final int STATE_SYSTEM_ERROR                 = 3;
+    // Backup or restore success
+    public static final int STATE_SUCCESS                      = 4;
+
+    private TextExport mTextExport;
+
+    private BackupUtils(Context context) {
+        mTextExport = new TextExport(context);
+    }
+
+    private static boolean externalStorageAvailable() {
+        return Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState());
+    }
+
+    public int exportToText() {
+        return mTextExport.exportToText();
+    }
+
+    public String getExportedTextFileName() {
+        return mTextExport.mFileName;
+    }
+
+    public String getExportedTextFileDir() {
+        return mTextExport.mFileDirectory;
+    }
+
+    private static class TextExport {
+        private static final String[] NOTE_PROJECTION = {
+                NoteColumns.ID,
+                NoteColumns.MODIFIED_DATE,
+                NoteColumns.SNIPPET,
+                NoteColumns.TYPE
+        };
+
+        private static final int NOTE_COLUMN_ID = 0;
+
+        private static final int NOTE_COLUMN_MODIFIED_DATE = 1;
+
+        private static final int NOTE_COLUMN_SNIPPET = 2;
+
+        private static final String[] DATA_PROJECTION = {
+                DataColumns.CONTENT,
+                DataColumns.MIME_TYPE,
+                DataColumns.DATA1,
+                DataColumns.DATA2,
+                DataColumns.DATA3,
+                DataColumns.DATA4,
+        };
+
+        private static final int DATA_COLUMN_CONTENT = 0;
+
+        private static final int DATA_COLUMN_MIME_TYPE = 1;
+
+        private static final int DATA_COLUMN_CALL_DATE = 2;
+
+        private static final int DATA_COLUMN_PHONE_NUMBER = 4;
+
+        private final String [] TEXT_FORMAT;
+        private static final int FORMAT_FOLDER_NAME          = 0;
+        private static final int FORMAT_NOTE_DATE            = 1;
+        private static final int FORMAT_NOTE_CONTENT         = 2;
+
+        private Context mContext;
+        private String mFileName;
+        private String mFileDirectory;
+
+        public TextExport(Context context) {
+            TEXT_FORMAT = context.getResources().getStringArray(R.array.format_for_exported_note);
+            mContext = context;
+            mFileName = "";
+            mFileDirectory = "";
+        }
+
+        private String getFormat(int id) {
+            return TEXT_FORMAT[id];
+        }
+
+        /**
+         * Export the folder identified by folder id to text
+         */
+        private void exportFolderToText(String folderId, PrintStream ps) {
+            // Query notes belong to this folder
+            Cursor notesCursor = mContext.getContentResolver().query(Notes.CONTENT_NOTE_URI,
+                    NOTE_PROJECTION, NoteColumns.PARENT_ID + "=?", new String[] {
+                        folderId
+                    }, null);
+
+            if (notesCursor != null) {
+                if (notesCursor.moveToFirst()) {
+                    do {
+                        // Print note's last modified date
+                        ps.println(String.format(getFormat(FORMAT_NOTE_DATE), DateFormat.format(
+                                mContext.getString(R.string.format_datetime_mdhm),
+                                notesCursor.getLong(NOTE_COLUMN_MODIFIED_DATE))));
+                        // Query data belong to this note
+                        String noteId = notesCursor.getString(NOTE_COLUMN_ID);
+                        exportNoteToText(noteId, ps);
+                    } while (notesCursor.moveToNext());
+                }
+                notesCursor.close();
+            }
+        }
+
+        /**
+         * Export note identified by id to a print stream
+         */
+        private void exportNoteToText(String noteId, PrintStream ps) {
+            Cursor dataCursor = mContext.getContentResolver().query(Notes.CONTENT_DATA_URI,
+                    DATA_PROJECTION, DataColumns.NOTE_ID + "=?", new String[] {
+                        noteId
+                    }, null);
+
+            if (dataCursor != null) {
+                if (dataCursor.moveToFirst()) {
+                    do {
+                        String mimeType = dataCursor.getString(DATA_COLUMN_MIME_TYPE);
+                        if (DataConstants.CALL_NOTE.equals(mimeType)) {
+                            // Print phone number
+                            String phoneNumber = dataCursor.getString(DATA_COLUMN_PHONE_NUMBER);
+                            long callDate = dataCursor.getLong(DATA_COLUMN_CALL_DATE);
+                            String location = dataCursor.getString(DATA_COLUMN_CONTENT);
+
+                            if (!TextUtils.isEmpty(phoneNumber)) {
+                                ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT),
+                                        phoneNumber));
+                            }
+                            // Print call date
+                            ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT), DateFormat
+                                    .format(mContext.getString(R.string.format_datetime_mdhm),
+                                            callDate)));
+                            // Print call attachment location
+                            if (!TextUtils.isEmpty(location)) {
+                                ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT),
+                                        location));
+                            }
+                        } else if (DataConstants.NOTE.equals(mimeType)) {
+                            String content = dataCursor.getString(DATA_COLUMN_CONTENT);
+                            if (!TextUtils.isEmpty(content)) {
+                                ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT),
+                                        content));
+                            }
+                        }
+                    } while (dataCursor.moveToNext());
+                }
+                dataCursor.close();
+            }
+            // print a line separator between note
+            try {
+                ps.write(new byte[] {
+                        Character.LINE_SEPARATOR, Character.LETTER_NUMBER
+                });
+            } catch (IOException e) {
+                Log.e(TAG, e.toString());
+            }
+        }
+
+        /**
+         * Note will be exported as text which is user readable
+         */
+        public int exportToText() {
+            if (!externalStorageAvailable()) {
+                Log.d(TAG, "Media was not mounted");
+                return STATE_SD_CARD_UNMOUONTED;
+            }
+
+            PrintStream ps = getExportToTextPrintStream();
+            if (ps == null) {
+                Log.e(TAG, "get print stream error");
+                return STATE_SYSTEM_ERROR;
+            }
+            // First export folder and its notes
+            Cursor folderCursor = mContext.getContentResolver().query(
+                    Notes.CONTENT_NOTE_URI,
+                    NOTE_PROJECTION,
+                    "(" + NoteColumns.TYPE + "=" + Notes.TYPE_FOLDER + " AND "
+                            + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER + ") OR "
+                            + NoteColumns.ID + "=" + Notes.ID_CALL_RECORD_FOLDER, null, null);
+
+            if (folderCursor != null) {
+                if (folderCursor.moveToFirst()) {
+                    do {
+                        // Print folder's name
+                        String folderName = "";
+                        if(folderCursor.getLong(NOTE_COLUMN_ID) == Notes.ID_CALL_RECORD_FOLDER) {
+                            folderName = mContext.getString(R.string.call_record_folder_name);
+                        } else {
+                            folderName = folderCursor.getString(NOTE_COLUMN_SNIPPET);
+                        }
+                        if (!TextUtils.isEmpty(folderName)) {
+                            ps.println(String.format(getFormat(FORMAT_FOLDER_NAME), folderName));
+                        }
+                        String folderId = folderCursor.getString(NOTE_COLUMN_ID);
+                        exportFolderToText(folderId, ps);
+                    } while (folderCursor.moveToNext());
+                }
+                folderCursor.close();
+            }
+
+            // Export notes in root's folder
+            Cursor noteCursor = mContext.getContentResolver().query(
+                    Notes.CONTENT_NOTE_URI,
+                    NOTE_PROJECTION,
+                    NoteColumns.TYPE + "=" + +Notes.TYPE_NOTE + " AND " + NoteColumns.PARENT_ID
+                            + "=0", null, null);
+
+            if (noteCursor != null) {
+                if (noteCursor.moveToFirst()) {
+                    do {
+                        ps.println(String.format(getFormat(FORMAT_NOTE_DATE), DateFormat.format(
+                                mContext.getString(R.string.format_datetime_mdhm),
+                                noteCursor.getLong(NOTE_COLUMN_MODIFIED_DATE))));
+                        // Query data belong to this note
+                        String noteId = noteCursor.getString(NOTE_COLUMN_ID);
+                        exportNoteToText(noteId, ps);
+                    } while (noteCursor.moveToNext());
+                }
+                noteCursor.close();
+            }
+            ps.close();
+
+            return STATE_SUCCESS;
+        }
+
+        /**
+         * Get a print stream pointed to the file {@generateExportedTextFile}
+         */
+        private PrintStream getExportToTextPrintStream() {
+            File file = generateFileMountedOnSDcard(mContext, R.string.file_path,
+                    R.string.file_name_txt_format);
+            if (file == null) {
+                Log.e(TAG, "create file to exported failed");
+                return null;
+            }
+            mFileName = file.getName();
+            mFileDirectory = mContext.getString(R.string.file_path);
+            PrintStream ps = null;
+            try {
+                FileOutputStream fos = new FileOutputStream(file);
+                ps = new PrintStream(fos);
+            } catch (FileNotFoundException e) {
+                e.printStackTrace();
+                return null;
+            } catch (NullPointerException e) {
+                e.printStackTrace();
+                return null;
+            }
+            return ps;
+        }
+    }
+
+    /**
+     * Generate the text file to store imported data
+     */
+    private static File generateFileMountedOnSDcard(Context context, int filePathResId, int fileNameFormatResId) {
+        StringBuilder sb = new StringBuilder();
+        sb.append(Environment.getExternalStorageDirectory());
+        sb.append(context.getString(filePathResId));
+        File filedir = new File(sb.toString());
+        sb.append(context.getString(
+                fileNameFormatResId,
+                DateFormat.format(context.getString(R.string.format_date_ymd),
+                        System.currentTimeMillis())));
+        File file = new File(sb.toString());
+
+        try {
+            if (!filedir.exists()) {
+                filedir.mkdir();
+            }
+            if (!file.exists()) {
+                file.createNewFile();
+            }
+            return file;
+        } catch (SecurityException e) {
+            e.printStackTrace();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+
+        return null;
+    }
+}
+
+

src/net/micode/notes/tool/DataUtils.java

@@ -0,0 +1,295 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.tool;
+
+import android.content.ContentProviderOperation;
+import android.content.ContentProviderResult;
+import android.content.ContentResolver;
+import android.content.ContentUris;
+import android.content.ContentValues;
+import android.content.OperationApplicationException;
+import android.database.Cursor;
+import android.os.RemoteException;
+import android.util.Log;
+
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.CallNote;
+import net.micode.notes.data.Notes.NoteColumns;
+import net.micode.notes.ui.NotesListAdapter.AppWidgetAttribute;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+
+
+public class DataUtils {
+    public static final String TAG = "DataUtils";
+    public static boolean batchDeleteNotes(ContentResolver resolver, HashSet<Long> ids) {
+        if (ids == null) {
+            Log.d(TAG, "the ids is null");
+            return true;
+        }
+        if (ids.size() == 0) {
+            Log.d(TAG, "no id is in the hashset");
+            return true;
+        }
+
+        ArrayList<ContentProviderOperation> operationList = new ArrayList<ContentProviderOperation>();
+        for (long id : ids) {
+            if(id == Notes.ID_ROOT_FOLDER) {
+                Log.e(TAG, "Don't delete system folder root");
+                continue;
+            }
+            ContentProviderOperation.Builder builder = ContentProviderOperation
+                    .newDelete(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id));
+            operationList.add(builder.build());
+        }
+        try {
+            ContentProviderResult[] results = resolver.applyBatch(Notes.AUTHORITY, operationList);
+            if (results == null || results.length == 0 || results[0] == null) {
+                Log.d(TAG, "delete notes failed, ids:" + ids.toString());
+                return false;
+            }
+            return true;
+        } catch (RemoteException e) {
+            Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));
+        } catch (OperationApplicationException e) {
+            Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));
+        }
+        return false;
+    }
+
+    public static void moveNoteToFoler(ContentResolver resolver, long id, long srcFolderId, long desFolderId) {
+        ContentValues values = new ContentValues();
+        values.put(NoteColumns.PARENT_ID, desFolderId);
+        values.put(NoteColumns.ORIGIN_PARENT_ID, srcFolderId);
+        values.put(NoteColumns.LOCAL_MODIFIED, 1);
+        resolver.update(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id), values, null, null);
+    }
+
+    public static boolean batchMoveToFolder(ContentResolver resolver, HashSet<Long> ids,
+            long folderId) {
+        if (ids == null) {
+            Log.d(TAG, "the ids is null");
+            return true;
+        }
+
+        ArrayList<ContentProviderOperation> operationList = new ArrayList<ContentProviderOperation>();
+        for (long id : ids) {
+            ContentProviderOperation.Builder builder = ContentProviderOperation
+                    .newUpdate(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id));
+            builder.withValue(NoteColumns.PARENT_ID, folderId);
+            builder.withValue(NoteColumns.LOCAL_MODIFIED, 1);
+            operationList.add(builder.build());
+        }
+
+        try {
+            ContentProviderResult[] results = resolver.applyBatch(Notes.AUTHORITY, operationList);
+            if (results == null || results.length == 0 || results[0] == null) {
+                Log.d(TAG, "delete notes failed, ids:" + ids.toString());
+                return false;
+            }
+            return true;
+        } catch (RemoteException e) {
+            Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));
+        } catch (OperationApplicationException e) {
+            Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));
+        }
+        return false;
+    }
+
+    /**
+     * Get the all folder count except system folders {@link Notes#TYPE_SYSTEM}}
+     */
+    public static int getUserFolderCount(ContentResolver resolver) {
+        Cursor cursor =resolver.query(Notes.CONTENT_NOTE_URI,
+                new String[] { "COUNT(*)" },
+                NoteColumns.TYPE + "=? AND " + NoteColumns.PARENT_ID + "<>?",
+                new String[] { String.valueOf(Notes.TYPE_FOLDER), String.valueOf(Notes.ID_TRASH_FOLER)},
+                null);
+
+        int count = 0;
+        if(cursor != null) {
+            if(cursor.moveToFirst()) {
+                try {
+                    count = cursor.getInt(0);
+                } catch (IndexOutOfBoundsException e) {
+                    Log.e(TAG, "get folder count failed:" + e.toString());
+                } finally {
+                    cursor.close();
+                }
+            }
+        }
+        return count;
+    }
+
+    public static boolean visibleInNoteDatabase(ContentResolver resolver, long noteId, int type) {
+        Cursor cursor = resolver.query(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId),
+                null,
+                NoteColumns.TYPE + "=? AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER,
+                new String [] {String.valueOf(type)},
+                null);
+
+        boolean exist = false;
+        if (cursor != null) {
+            if (cursor.getCount() > 0) {
+                exist = true;
+            }
+            cursor.close();
+        }
+        return exist;
+    }
+
+    public static boolean existInNoteDatabase(ContentResolver resolver, long noteId) {
+        Cursor cursor = resolver.query(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId),
+                null, null, null, null);
+
+        boolean exist = false;
+        if (cursor != null) {
+            if (cursor.getCount() > 0) {
+                exist = true;
+            }
+            cursor.close();
+        }
+        return exist;
+    }
+
+    public static boolean existInDataDatabase(ContentResolver resolver, long dataId) {
+        Cursor cursor = resolver.query(ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId),
+                null, null, null, null);
+
+        boolean exist = false;
+        if (cursor != null) {
+            if (cursor.getCount() > 0) {
+                exist = true;
+            }
+            cursor.close();
+        }
+        return exist;
+    }
+
+    public static boolean checkVisibleFolderName(ContentResolver resolver, String name) {
+        Cursor cursor = resolver.query(Notes.CONTENT_NOTE_URI, null,
+                NoteColumns.TYPE + "=" + Notes.TYPE_FOLDER +
+                " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER +
+                " AND " + NoteColumns.SNIPPET + "=?",
+                new String[] { name }, null);
+        boolean exist = false;
+        if(cursor != null) {
+            if(cursor.getCount() > 0) {
+                exist = true;
+            }
+            cursor.close();
+        }
+        return exist;
+    }
+
+    public static HashSet<AppWidgetAttribute> getFolderNoteWidget(ContentResolver resolver, long folderId) {
+        Cursor c = resolver.query(Notes.CONTENT_NOTE_URI,
+                new String[] { NoteColumns.WIDGET_ID, NoteColumns.WIDGET_TYPE },
+                NoteColumns.PARENT_ID + "=?",
+                new String[] { String.valueOf(folderId) },
+                null);
+
+        HashSet<AppWidgetAttribute> set = null;
+        if (c != null) {
+            if (c.moveToFirst()) {
+                set = new HashSet<AppWidgetAttribute>();
+                do {
+                    try {
+                        AppWidgetAttribute widget = new AppWidgetAttribute();
+                        widget.widgetId = c.getInt(0);
+                        widget.widgetType = c.getInt(1);
+                        set.add(widget);
+                    } catch (IndexOutOfBoundsException e) {
+                        Log.e(TAG, e.toString());
+                    }
+                } while (c.moveToNext());
+            }
+            c.close();
+        }
+        return set;
+    }
+
+    public static String getCallNumberByNoteId(ContentResolver resolver, long noteId) {
+        Cursor cursor = resolver.query(Notes.CONTENT_DATA_URI,
+                new String [] { CallNote.PHONE_NUMBER },
+                CallNote.NOTE_ID + "=? AND " + CallNote.MIME_TYPE + "=?",
+                new String [] { String.valueOf(noteId), CallNote.CONTENT_ITEM_TYPE },
+                null);
+
+        if (cursor != null && cursor.moveToFirst()) {
+            try {
+                return cursor.getString(0);
+            } catch (IndexOutOfBoundsException e) {
+                Log.e(TAG, "Get call number fails " + e.toString());
+            } finally {
+                cursor.close();
+            }
+        }
+        return "";
+    }
+
+    public static long getNoteIdByPhoneNumberAndCallDate(ContentResolver resolver, String phoneNumber, long callDate) {
+        Cursor cursor = resolver.query(Notes.CONTENT_DATA_URI,
+                new String [] { CallNote.NOTE_ID },
+                CallNote.CALL_DATE + "=? AND " + CallNote.MIME_TYPE + "=? AND PHONE_NUMBERS_EQUAL("
+                + CallNote.PHONE_NUMBER + ",?)",
+                new String [] { String.valueOf(callDate), CallNote.CONTENT_ITEM_TYPE, phoneNumber },
+                null);
+
+        if (cursor != null) {
+            if (cursor.moveToFirst()) {
+                try {
+                    return cursor.getLong(0);
+                } catch (IndexOutOfBoundsException e) {
+                    Log.e(TAG, "Get call note id fails " + e.toString());
+                }
+            }
+            cursor.close();
+        }
+        return 0;
+    }
+
+    public static String getSnippetById(ContentResolver resolver, long noteId) {
+        Cursor cursor = resolver.query(Notes.CONTENT_NOTE_URI,
+                new String [] { NoteColumns.SNIPPET },
+                NoteColumns.ID + "=?",
+                new String [] { String.valueOf(noteId)},
+                null);
+
+        if (cursor != null) {
+            String snippet = "";
+            if (cursor.moveToFirst()) {
+                snippet = cursor.getString(0);
+            }
+            cursor.close();
+            return snippet;
+        }
+        throw new IllegalArgumentException("Note is not found with id: " + noteId);
+    }
+
+    public static String getFormattedSnippet(String snippet) {
+        if (snippet != null) {
+            snippet = snippet.trim();
+            int index = snippet.indexOf('\n');
+            if (index != -1) {
+                snippet = snippet.substring(0, index);
+            }
+        }
+        return snippet;
+    }
+}

src/net/micode/notes/tool/GTaskStringUtils.java

@@ -0,0 +1,113 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.tool;
+
+public class GTaskStringUtils {
+
+    public final static String GTASK_JSON_ACTION_ID = "action_id";
+
+    public final static String GTASK_JSON_ACTION_LIST = "action_list";
+
+    public final static String GTASK_JSON_ACTION_TYPE = "action_type";
+
+    public final static String GTASK_JSON_ACTION_TYPE_CREATE = "create";
+
+    public final static String GTASK_JSON_ACTION_TYPE_GETALL = "get_all";
+
+    public final static String GTASK_JSON_ACTION_TYPE_MOVE = "move";
+
+    public final static String GTASK_JSON_ACTION_TYPE_UPDATE = "update";
+
+    public final static String GTASK_JSON_CREATOR_ID = "creator_id";
+
+    public final static String GTASK_JSON_CHILD_ENTITY = "child_entity";
+
+    public final static String GTASK_JSON_CLIENT_VERSION = "client_version";
+
+    public final static String GTASK_JSON_COMPLETED = "completed";
+
+    public final static String GTASK_JSON_CURRENT_LIST_ID = "current_list_id";
+
+    public final static String GTASK_JSON_DEFAULT_LIST_ID = "default_list_id";
+
+    public final static String GTASK_JSON_DELETED = "deleted";
+
+    public final static String GTASK_JSON_DEST_LIST = "dest_list";
+
+    public final static String GTASK_JSON_DEST_PARENT = "dest_parent";
+
+    public final static String GTASK_JSON_DEST_PARENT_TYPE = "dest_parent_type";
+
+    public final static String GTASK_JSON_ENTITY_DELTA = "entity_delta";
+
+    public final static String GTASK_JSON_ENTITY_TYPE = "entity_type";
+
+    public final static String GTASK_JSON_GET_DELETED = "get_deleted";
+
+    public final static String GTASK_JSON_ID = "id";
+
+    public final static String GTASK_JSON_INDEX = "index";
+
+    public final static String GTASK_JSON_LAST_MODIFIED = "last_modified";
+
+    public final static String GTASK_JSON_LATEST_SYNC_POINT = "latest_sync_point";
+
+    public final static String GTASK_JSON_LIST_ID = "list_id";
+
+    public final static String GTASK_JSON_LISTS = "lists";
+
+    public final static String GTASK_JSON_NAME = "name";
+
+    public final static String GTASK_JSON_NEW_ID = "new_id";
+
+    public final static String GTASK_JSON_NOTES = "notes";
+
+    public final static String GTASK_JSON_PARENT_ID = "parent_id";
+
+    public final static String GTASK_JSON_PRIOR_SIBLING_ID = "prior_sibling_id";
+
+    public final static String GTASK_JSON_RESULTS = "results";
+
+    public final static String GTASK_JSON_SOURCE_LIST = "source_list";
+
+    public final static String GTASK_JSON_TASKS = "tasks";
+
+    public final static String GTASK_JSON_TYPE = "type";
+
+    public final static String GTASK_JSON_TYPE_GROUP = "GROUP";
+
+    public final static String GTASK_JSON_TYPE_TASK = "TASK";
+
+    public final static String GTASK_JSON_USER = "user";
+
+    public final static String MIUI_FOLDER_PREFFIX = "[MIUI_Notes]";
+
+    public final static String FOLDER_DEFAULT = "Default";
+
+    public final static String FOLDER_CALL_NOTE = "Call_Note";
+
+    public final static String FOLDER_META = "METADATA";
+
+    public final static String META_HEAD_GTASK_ID = "meta_gid";
+
+    public final static String META_HEAD_NOTE = "meta_note";
+
+    public final static String META_HEAD_DATA = "meta_data";
+
+    public final static String META_NOTE_NAME = "[META INFO] DON'T UPDATE AND DELETE";
+
+}

src/net/micode/notes/tool/ResourceParser.java

@@ -0,0 +1,181 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.tool;
+
+import android.content.Context;
+import android.preference.PreferenceManager;
+
+import net.micode.notes.R;
+import net.micode.notes.ui.NotesPreferenceActivity;
+
+public class ResourceParser {
+
+    public static final int YELLOW           = 0;
+    public static final int BLUE             = 1;
+    public static final int WHITE            = 2;
+    public static final int GREEN            = 3;
+    public static final int RED              = 4;
+
+    public static final int BG_DEFAULT_COLOR = YELLOW;
+
+    public static final int TEXT_SMALL       = 0;
+    public static final int TEXT_MEDIUM      = 1;
+    public static final int TEXT_LARGE       = 2;
+    public static final int TEXT_SUPER       = 3;
+
+    public static final int BG_DEFAULT_FONT_SIZE = TEXT_MEDIUM;
+
+    public static class NoteBgResources {
+        private final static int [] BG_EDIT_RESOURCES = new int [] {
+            R.drawable.edit_yellow,
+            R.drawable.edit_blue,
+            R.drawable.edit_white,
+            R.drawable.edit_green,
+            R.drawable.edit_red
+        };
+
+        private final static int [] BG_EDIT_TITLE_RESOURCES = new int [] {
+            R.drawable.edit_title_yellow,
+            R.drawable.edit_title_blue,
+            R.drawable.edit_title_white,
+            R.drawable.edit_title_green,
+            R.drawable.edit_title_red
+        };
+
+        public static int getNoteBgResource(int id) {
+            return BG_EDIT_RESOURCES[id];
+        }
+
+        public static int getNoteTitleBgResource(int id) {
+            return BG_EDIT_TITLE_RESOURCES[id];
+        }
+    }
+
+    public static int getDefaultBgId(Context context) {
+        if (PreferenceManager.getDefaultSharedPreferences(context).getBoolean(
+                NotesPreferenceActivity.PREFERENCE_SET_BG_COLOR_KEY, false)) {
+            return (int) (Math.random() * NoteBgResources.BG_EDIT_RESOURCES.length);
+        } else {
+            return BG_DEFAULT_COLOR;
+        }
+    }
+
+    public static class NoteItemBgResources {
+        private final static int [] BG_FIRST_RESOURCES = new int [] {
+            R.drawable.list_yellow_up,
+            R.drawable.list_blue_up,
+            R.drawable.list_white_up,
+            R.drawable.list_green_up,
+            R.drawable.list_red_up
+        };
+
+        private final static int [] BG_NORMAL_RESOURCES = new int [] {
+            R.drawable.list_yellow_middle,
+            R.drawable.list_blue_middle,
+            R.drawable.list_white_middle,
+            R.drawable.list_green_middle,
+            R.drawable.list_red_middle
+        };
+
+        private final static int [] BG_LAST_RESOURCES = new int [] {
+            R.drawable.list_yellow_down,
+            R.drawable.list_blue_down,
+            R.drawable.list_white_down,
+            R.drawable.list_green_down,
+            R.drawable.list_red_down,
+        };
+
+        private final static int [] BG_SINGLE_RESOURCES = new int [] {
+            R.drawable.list_yellow_single,
+            R.drawable.list_blue_single,
+            R.drawable.list_white_single,
+            R.drawable.list_green_single,
+            R.drawable.list_red_single
+        };
+
+        public static int getNoteBgFirstRes(int id) {
+            return BG_FIRST_RESOURCES[id];
+        }
+
+        public static int getNoteBgLastRes(int id) {
+            return BG_LAST_RESOURCES[id];
+        }
+
+        public static int getNoteBgSingleRes(int id) {
+            return BG_SINGLE_RESOURCES[id];
+        }
+
+        public static int getNoteBgNormalRes(int id) {
+            return BG_NORMAL_RESOURCES[id];
+        }
+
+        public static int getFolderBgRes() {
+            return R.drawable.list_folder;
+        }
+    }
+
+    public static class WidgetBgResources {
+        private final static int [] BG_2X_RESOURCES = new int [] {
+            R.drawable.widget_2x_yellow,
+            R.drawable.widget_2x_blue,
+            R.drawable.widget_2x_white,
+            R.drawable.widget_2x_green,
+            R.drawable.widget_2x_red,
+        };
+
+        public static int getWidget2xBgResource(int id) {
+            return BG_2X_RESOURCES[id];
+        }
+
+        private final static int [] BG_4X_RESOURCES = new int [] {
+            R.drawable.widget_4x_yellow,
+            R.drawable.widget_4x_blue,
+            R.drawable.widget_4x_white,
+            R.drawable.widget_4x_green,
+            R.drawable.widget_4x_red
+        };
+
+        public static int getWidget4xBgResource(int id) {
+            return BG_4X_RESOURCES[id];
+        }
+    }
+
+    public static class TextAppearanceResources {
+        private final static int [] TEXTAPPEARANCE_RESOURCES = new int [] {
+            R.style.TextAppearanceNormal,
+            R.style.TextAppearanceMedium,
+            R.style.TextAppearanceLarge,
+            R.style.TextAppearanceSuper
+        };
+
+        public static int getTexAppearanceResource(int id) {
+            /**
+             * HACKME: Fix bug of store the resource id in shared preference.
+             * The id may larger than the length of resources, in this case,
+             * return the {@link ResourceParser#BG_DEFAULT_FONT_SIZE}
+             */
+            if (id >= TEXTAPPEARANCE_RESOURCES.length) {
+                return BG_DEFAULT_FONT_SIZE;
+            }
+            return TEXTAPPEARANCE_RESOURCES[id];
+        }
+
+        public static int getResourcesSize() {
+            return TEXTAPPEARANCE_RESOURCES.length;
+        }
+    }
+}

src/net/micode/notes/ui/AlarmAlertActivity-note.java

@@ -0,0 +1,176 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui;
+import android.app.Activity;
+import android.app.AlertDialog;
+// 导入Android的AlertDialog类, 用于显示警告对话框
+import android.content.Context;
+// 导入Android的Context类，提供应用环境的描述和访问应用资源等
+import android.content.DialogInterface;
+// 导入Android的DialogInterface类，表示对话框的接口
+import android.content.DialogInterface.OnClickListener;
+// 导入DialogInterface的OnClickListener接口，用于处理对话框按钮点击事件
+import android.content.DialogInterface.OnDismissListener;
+// 导入DialogInterface的OnDismissListener接口，用于处理对话框关闭事件
+import android.content.Intent;
+// 导入Android的Intent类，用于在应用组件之间传递信息
+import android.media.AudioManager;
+// 导入Android的AudioManager类，用于管理和控制音频设置
+import android.media.MediaPlayer;
+// 导入Android的MediaPlayer类，用于播放音频文件
+import android.media.RingtoneManager;
+// 导入Android的RingtoneManager类，用于获取系统默认铃声
+import android.net.Uri;
+// 导入Android的Uri类，用于表示统一资源标识符
+import android.os.Bundle;
+// 导入Android的Bundle类，用于传递Activity之间的状态及数据
+import android.os.PowerManager;
+// 导入Android的PowerManager类，用于管理设备的电源状态
+import android.provider.Settings;
+// 导入Android的Settings类，用于访问系统设置
+import android.view.Window;
+// 导入Android的Window类，表示一个窗口的抽象
+import android.view.WindowManager;
+// 导入Android的WindowManager类，用于管理和控制窗口的显示
+
+import net.micode.notes.R;
+// 导入应用程序的资源类，通常用于访问字符串、图像等资源
+import net.micode.notes.data.Notes;
+// 导入应用程序的Notes类，表示笔记的数据模型
+import net.micode.notes.tool.DataUtils;
+// 导入应用程序的DataUtils工具类，提供数据处理的实用方法
+
+import java.io.IOException;
+// 导入Java的IOException类，用于处理输入输出异常
+
+
+
+public class AlarmAlertActivity extends Activity implements OnClickListener, OnDismissListener {
+// 定义AlarmAlertActivity类，继承自Activity，并实现了OnClickListener和OnDismissListener接口
+
+    private long mNoteId; // 定义一个长整型变量mNoteId，用于存储笔记ID
+    private String mSnippet; // 定义一个字符串变量mSnippet，用于存储笔记摘要
+    private static final int SNIPPET_PREW_MAX_LEN = 60; // 定义常量SNIPPET_PREW_MAX_LEN，表示摘要最大长度
+    MediaPlayer mPlayer; // 定义一个MediaPlayer对象，用于播放音频
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState); // 调用父类的onCreate方法，执行Activity创建的基本操作
+        requestWindowFeature(Window.FEATURE_NO_TITLE); // 请求窗口特性，不显示标题
+
+        final Window win = getWindow(); // 获取当前窗口对象
+        win.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED); // 在锁屏状态下显示窗口
+
+        if (!isScreenOn()) { // 检查屏幕是否处于开启状态
+            win.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON // 保持屏幕常亮
+                    | WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON // 打开屏幕
+                    | WindowManager.LayoutParams.FLAG_ALLOW_LOCK_WHILE_SCREEN_ON // 允许锁定时屏幕常亮
+                    | WindowManager.LayoutParams.FLAG_LAYOUT_INSET_DECOR); // 添加装饰物
+        }
+
+        Intent intent = getIntent(); // 获取启动该Activity的Intent
+
+        try {
+            mNoteId = Long.valueOf(intent.getData().getPathSegments().get(1)); // 解析笔记ID
+            mSnippet = DataUtils.getSnippetById(this.getContentResolver(), mNoteId); // 从数据库获取笔记摘要
+            mSnippet = mSnippet.length() > SNIPPET_PREW_MAX_LEN ? mSnippet.substring(0, // 如果摘要超过最大长度，进行截断
+                    SNIPPET_PREW_MAX_LEN) + getResources().getString(R.string.notelist_string_info) // 添加信息提示
+                    : mSnippet; // 否则保持原样
+        } catch (IllegalArgumentException e) {
+            e.printStackTrace(); // 打印异常堆栈信息
+            return; // 发生异常时返回
+        }
+
+        mPlayer = new MediaPlayer(); // 创建MediaPlayer实例
+        if (DataUtils.visibleInNoteDatabase(getContentResolver(), mNoteId, Notes.TYPE_NOTE)) { // 检查笔记是否在数据库中可见
+            showActionDialog(); // 显示操作对话框
+            playAlarmSound(); // 播放闹钟声音
+        } else {
+            finish(); // 如果笔记不可见，则结束Activity
+        }
+    }
+
+    private boolean isScreenOn() {
+        PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE); // 获取电源管理器实例
+        return pm.isScreenOn(); // 返回屏幕是否开启的状态
+    }
+
+    private void playAlarmSound() { // 方法用于播放闹钟声音
+        Uri url = RingtoneManager.getActualDefaultRingtoneUri(this, RingtoneManager.TYPE_ALARM); // 获取系统默认闹钟铃声的URI
+
+        int silentModeStreams = Settings.System.getInt(getContentResolver(), // 检查静音模式影响的音频流
+                Settings.System.MODE_RINGER_STREAMS_AFFECTED, 0);
+
+        if ((silentModeStreams & (1 << AudioManager.STREAM_ALARM)) != 0) { // 如果静音模式影响闹钟流
+            mPlayer.setAudioStreamType(silentModeStreams); // 设置MediaPlayer的音频流类型
+        } else {
+            mPlayer.setAudioStreamType(AudioManager.STREAM_ALARM); // 否则设置为闹钟音频流类型
+        }
+        
+        try {
+            mPlayer.setDataSource(this, url); // 设置MediaPlayer的数据源为闹钟铃声
+            mPlayer.prepare(); // 准备MediaPlayer
+            mPlayer.setLooping(true); // 设置音频循环播放
+            mPlayer.start(); // 开始播放音频
+        } catch (IllegalArgumentException e) {
+            e.printStackTrace(); // 捕获并打印异常
+        } catch (SecurityException e) {
+            e.printStackTrace(); // 捕获并打印异常
+        } catch (IllegalStateException e) {
+            e.printStackTrace(); // 捕获并打印异常
+        } catch (IOException e) {
+            e.printStackTrace(); // 捕获并打印异常
+        }
+    }
+
+    private void showActionDialog() { // 方法用于显示操作对话框
+        AlertDialog.Builder dialog = new AlertDialog.Builder(this); // 创建AlertDialog构建器
+        dialog.setTitle(R.string.app_name); // 设置对话框标题为应用名
+        dialog.setMessage(mSnippet); // 设置对话框内容为笔记摘要
+        dialog.setPositiveButton(R.string.notealert_ok, this); // 设置“确认”按钮，并指定点击监听器
+        if (isScreenOn()) { // 如果屏幕处于开启状态
+            dialog.setNegativeButton(R.string.notealert_enter, this); // 设置“进入”按钮，并指定点击监听器
+        }
+        dialog.show().setOnDismissListener(this); // 显示对话框，并设置关闭监听器
+    }
+
+    public void onClick(DialogInterface dialog, int which) { // 点击对话框按钮的事件处理
+        switch (which) {
+            case DialogInterface.BUTTON_NEGATIVE: // 如果点击了“进入”按钮
+                Intent intent = new Intent(this, NoteEditActivity.class); // 创建Intent用于跳转到笔记编辑Activity
+                intent.setAction(Intent.ACTION_VIEW); // 设置Intent的操作为查看
+                intent.putExtra(Intent.EXTRA_UID, mNoteId); // 将笔记ID作为额外数据传递
+                startActivity(intent); // 启动新的Activity
+                break;
+            default:
+                break; // 默认情况无操作
+        }
+    }
+
+    public void onDismiss(DialogInterface dialog) { // 对话框关闭时的事件处理
+        stopAlarmSound(); // 停止闹钟音效
+        finish(); // 结束该Activity
+    }
+
+    private void stopAlarmSound() { // 方法用于停止播放闹钟声音
+        if (mPlayer != null) { // 检查MediaPlayer是否不为空
+            mPlayer.stop(); // 停止播放
+            mPlayer.release(); // 释放MediaPlayer资源
+            mPlayer = null; // 将MediaPlayer置为null
+        }
+    }
+}

src/net/micode/notes/ui/AlarmAlertActivity.java

@@ -0,0 +1,158 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui;
+
+import android.app.Activity;
+import android.app.AlertDialog;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.content.DialogInterface.OnClickListener;
+import android.content.DialogInterface.OnDismissListener;
+import android.content.Intent;
+import android.media.AudioManager;
+import android.media.MediaPlayer;
+import android.media.RingtoneManager;
+import android.net.Uri;
+import android.os.Bundle;
+import android.os.PowerManager;
+import android.provider.Settings;
+import android.view.Window;
+import android.view.WindowManager;
+
+import net.micode.notes.R;
+import net.micode.notes.data.Notes;
+import net.micode.notes.tool.DataUtils;
+
+import java.io.IOException;
+
+
+public class AlarmAlertActivity extends Activity implements OnClickListener, OnDismissListener {
+    private long mNoteId;
+    private String mSnippet;
+    private static final int SNIPPET_PREW_MAX_LEN = 60;
+    MediaPlayer mPlayer;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        requestWindowFeature(Window.FEATURE_NO_TITLE);
+
+        final Window win = getWindow();
+        win.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
+
+        if (!isScreenOn()) {
+            win.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
+                    | WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON
+                    | WindowManager.LayoutParams.FLAG_ALLOW_LOCK_WHILE_SCREEN_ON
+                    | WindowManager.LayoutParams.FLAG_LAYOUT_INSET_DECOR);
+        }
+
+        Intent intent = getIntent();
+
+        try {
+            mNoteId = Long.valueOf(intent.getData().getPathSegments().get(1));
+            mSnippet = DataUtils.getSnippetById(this.getContentResolver(), mNoteId);
+            mSnippet = mSnippet.length() > SNIPPET_PREW_MAX_LEN ? mSnippet.substring(0,
+                    SNIPPET_PREW_MAX_LEN) + getResources().getString(R.string.notelist_string_info)
+                    : mSnippet;
+        } catch (IllegalArgumentException e) {
+            e.printStackTrace();
+            return;
+        }
+
+        mPlayer = new MediaPlayer();
+        if (DataUtils.visibleInNoteDatabase(getContentResolver(), mNoteId, Notes.TYPE_NOTE)) {
+            showActionDialog();
+            playAlarmSound();
+        } else {
+            finish();
+        }
+    }
+
+    private boolean isScreenOn() {
+        PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
+        return pm.isScreenOn();
+    }
+
+    private void playAlarmSound() {
+        Uri url = RingtoneManager.getActualDefaultRingtoneUri(this, RingtoneManager.TYPE_ALARM);
+
+        int silentModeStreams = Settings.System.getInt(getContentResolver(),
+                Settings.System.MODE_RINGER_STREAMS_AFFECTED, 0);
+
+        if ((silentModeStreams & (1 << AudioManager.STREAM_ALARM)) != 0) {
+            mPlayer.setAudioStreamType(silentModeStreams);
+        } else {
+            mPlayer.setAudioStreamType(AudioManager.STREAM_ALARM);
+        }
+        try {
+            mPlayer.setDataSource(this, url);
+            mPlayer.prepare();
+            mPlayer.setLooping(true);
+            mPlayer.start();
+        } catch (IllegalArgumentException e) {
+            // TODO Auto-generated catch block
+            e.printStackTrace();
+        } catch (SecurityException e) {
+            // TODO Auto-generated catch block
+            e.printStackTrace();
+        } catch (IllegalStateException e) {
+            // TODO Auto-generated catch block
+            e.printStackTrace();
+        } catch (IOException e) {
+            // TODO Auto-generated catch block
+            e.printStackTrace();
+        }
+    }
+
+    private void showActionDialog() {
+        AlertDialog.Builder dialog = new AlertDialog.Builder(this);
+        dialog.setTitle(R.string.app_name);
+        dialog.setMessage(mSnippet);
+        dialog.setPositiveButton(R.string.notealert_ok, this);
+        if (isScreenOn()) {
+            dialog.setNegativeButton(R.string.notealert_enter, this);
+        }
+        dialog.show().setOnDismissListener(this);
+    }
+
+    public void onClick(DialogInterface dialog, int which) {
+        switch (which) {
+            case DialogInterface.BUTTON_NEGATIVE:
+                Intent intent = new Intent(this, NoteEditActivity.class);
+                intent.setAction(Intent.ACTION_VIEW);
+                intent.putExtra(Intent.EXTRA_UID, mNoteId);
+                startActivity(intent);
+                break;
+            default:
+                break;
+        }
+    }
+
+    public void onDismiss(DialogInterface dialog) {
+        stopAlarmSound();
+        finish();
+    }
+
+    private void stopAlarmSound() {
+        if (mPlayer != null) {
+            mPlayer.stop();
+            mPlayer.release();
+            mPlayer = null;
+        }
+    }
+}

src/net/micode/notes/ui/AlarmInitReceiver-note.java

@@ -0,0 +1,89 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui;
+// 定义当前类所属的包，通常用于组织代码并避免命名冲突
+
+import android.app.AlarmManager;
+// 导入Android的AlarmManager类，用于设置和管理闹钟
+import android.app.PendingIntent;
+// 导入Android的PendingIntent类，用于在Future时刻发送意图（Intent）
+import android.content.BroadcastReceiver;
+// 导入Android的BroadcastReceiver类，用于接收广播消息
+import android.content.ContentUris;
+// 导入Android的ContentUris类，用于处理内容提供者的URI
+import android.content.Context;
+// 导入Android的Context类，提供应用程序环境的描述
+import android.content.Intent;
+// 导入Android的Intent类，用于在应用组件之间传递信息
+import android.database.Cursor;
+// 导入Android的Cursor类，用于访问查询结果
+
+import net.micode.notes.data.Notes;
+// 导入应用程序的Notes类，表示笔记的数据模型
+import net.micode.notes.data.Notes.NoteColumns;
+// 导入Notes类中的列定义，用于表明笔记的数据库字段
+
+
+public class AlarmInitReceiver extends BroadcastReceiver {
+// 定义类 AlarmInitReceiver，继承自 BroadcastReceiver，用于处理广播接收
+
+    private static final String [] PROJECTION = new String [] {
+// 定义一个字符串数组 PROJECTION，指定要查询的列
+        NoteColumns.ID, // 笔记的 ID
+        NoteColumns.ALERTED_DATE // 笔记的提醒日期
+    };
+
+    private static final int COLUMN_ID                = 0; // 定义常量 COLUMN_ID，表示 ID 列的索引
+    private static final int COLUMN_ALERTED_DATE      = 1; // 定义常量 COLUMN_ALERTED_DATE，表示提醒日期列的索引
+
+    @Override
+    public void onReceive(Context context, Intent intent) {
+// 当接收到广播时调用此方法
+        long currentDate = System.currentTimeMillis(); // 获取当前时间的毫秒值
+        Cursor c = context.getContentResolver().query(Notes.CONTENT_NOTE_URI,
+// 通过内容解析器查询笔记内容提供者，获取光标
+                PROJECTION, // 指定要查询的列
+                NoteColumns.ALERTED_DATE + ">? AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE, // 查询条件：提醒日期大于当前时间且类型为笔记
+                new String[] { String.valueOf(currentDate) }, // 查询参数：当前时间的字符串形式
+                null);//查询时的排序参数，这里设置为 null，表示使用默认排序。
+
+        if (c != null) {
+//检查返回的 Cursor 是否为空，确保查询结果有效。
+            if (c.moveToFirst()) {
+//如果 Cursor 能移动到第一行，表示查询到有结果。
+                do {
+//开始循环处理每一行的查询结果。
+                    long alertDate = c.getLong(COLUMN_ALERTED_DATE);
+//获取当前行的提醒日期，并将其赋值给 alertDate 变量。
+                    Intent sender = new Intent(context, AlarmReceiver.class);
+//创建一个 Intent 对象，指定要发送到的接收者 AlarmReceiver。
+                    sender.setData(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, c.getLong(COLUMN_ID)));
+//设置 Intent 的数据为笔记的 URI，使用 ContentUris 类附加当前行的笔记 ID。
+                    PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, sender, 0);
+//创建一个 PendingIntent，用于将来发送广播，传递刚创建的 Intent。
+                    AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
+//获取系统的 AlarmManager 服务，以便设置闹钟。
+                    alarmManager.set(AlarmManager.RTC_WAKEUP, alertDate, pendingIntent);
+//使用 AlarmManager 设置一个闹钟，指定为 RTC_WAKEUP 模式，设置该闹钟的提醒时间为 alertDate，并关联到之前创建的 PendingIntent。
+                }while (c.moveToNext());
+//移动到 Cursor 中的下一行，继续处理下一条查询结果，直到没有更多行。
+            }
+            c.close();
+//关闭 Cursor，释放与其相关联的资源，防止内存泄漏。
+        }
+    }
+}

src/net/micode/notes/ui/AlarmInitReceiver.java

@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui;
+
+import android.app.AlarmManager;
+import android.app.PendingIntent;
+import android.content.BroadcastReceiver;
+import android.content.ContentUris;
+import android.content.Context;
+import android.content.Intent;
+import android.database.Cursor;
+
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.NoteColumns;
+
+
+public class AlarmInitReceiver extends BroadcastReceiver {
+
+    private static final String [] PROJECTION = new String [] {
+        NoteColumns.ID,
+        NoteColumns.ALERTED_DATE
+    };
+
+    private static final int COLUMN_ID                = 0;
+    private static final int COLUMN_ALERTED_DATE      = 1;
+
+    @Override
+    public void onReceive(Context context, Intent intent) {
+        long currentDate = System.currentTimeMillis();
+        Cursor c = context.getContentResolver().query(Notes.CONTENT_NOTE_URI,
+                PROJECTION,
+                NoteColumns.ALERTED_DATE + ">? AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE,
+                new String[] { String.valueOf(currentDate) },
+                null);
+
+        if (c != null) {
+            if (c.moveToFirst()) {
+                do {
+                    long alertDate = c.getLong(COLUMN_ALERTED_DATE);
+                    Intent sender = new Intent(context, AlarmReceiver.class);
+                    sender.setData(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, c.getLong(COLUMN_ID)));
+                    PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, sender, 0);
+                    AlarmManager alermManager = (AlarmManager) context
+                            .getSystemService(Context.ALARM_SERVICE);
+                    alermManager.set(AlarmManager.RTC_WAKEUP, alertDate, pendingIntent);
+                } while (c.moveToNext());
+            }
+            c.close();
+        }
+    }
+}

src/net/micode/notes/ui/AlarmReceiver-note.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui;
+
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+
+public class AlarmReceiver extends BroadcastReceiver {
+//声明一个公共类 AlarmReceiver，它继承自 BroadcastReceiver，用于处理接收到的广播。
+    @Override
+//注解，表明接下来的方法是对父类方法的重写。
+    public void onReceive(Context context, Intent intent) {
+//定义 onReceive 方法，当接收器接收到广播时会自动调用此方法。context: 提供调用应用环境的上下文信息。intent: 带有相关信息的 Intent，可以用来处理接收到的数据。
+    intent.setClass(context, AlarmAlertActivity.class);
+//将传入的 Intent 的目标类设置为 AlarmAlertActivity。这意味着当该 Intent 被处理时，会启动 AlarmAlertActivity 这个活动。
+    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+//为 Intent 添加标志 FLAG_ACTIVITY_NEW_TASK，表示要启动一个新的任务来运行这个活动。这通常用于在非活动上下文中启动活动。
+    context.startActivity(intent);
+//使用提供的上下文来启动指定的活动，即 AlarmAlertActivity。这会使应用程序的 UI 界面切换到闹钟提醒的活动。
+    }
+}

src/net/micode/notes/ui/AlarmReceiver.java

@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui;
+
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+
+public class AlarmReceiver extends BroadcastReceiver {
+    @Override
+    public void onReceive(Context context, Intent intent) {
+        intent.setClass(context, AlarmAlertActivity.class);
+        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+        context.startActivity(intent);
+    }
+}

src/net/micode/notes/ui/DateTimePicker-note.java

@@ -0,0 +1,520 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui; // 定义包名
+
+import java.text.DateFormatSymbols; // 导入日期格式符号类
+import java.util.Calendar; // 导入日历类
+
+import net.micode.notes.R; // 导入资源类
+
+import android.content.Context; // 导入上下文类
+import android.text.format.DateFormat; // 导入日期格式类
+import android.view.View; // 导入视图类
+import android.widget.FrameLayout; // 导入框架布局类
+import android.widget.NumberPicker; // 导入数字选择器类
+
+public class DateTimePicker extends FrameLayout { // 定义日期时间选择器类，继承自 FrameLayout
+
+    private static final boolean DEFAULT_ENABLE_STATE = true; // 默认启用状态为 true
+
+    private static final int HOURS_IN_HALF_DAY = 12; // 半天的小时数
+    private static final int HOURS_IN_ALL_DAY = 24; // 全天的小时数
+    private static final int DAYS_IN_ALL_WEEK = 7; // 一周的天数
+    private static final int DATE_SPINNER_MIN_VAL = 0; // 日期选择器的最小值
+    private static final int DATE_SPINNER_MAX_VAL = DAYS_IN_ALL_WEEK - 1; // 日期选择器的最大值
+    private static final int HOUR_SPINNER_MIN_VAL_24_HOUR_VIEW = 0; // 24小时制下小时选择器的最小值
+    private static final int HOUR_SPINNER_MAX_VAL_24_HOUR_VIEW = 23; // 24小时制下小时选择器的最大值
+    private static final int HOUR_SPINNER_MIN_VAL_12_HOUR_VIEW = 1; // 12小时制下小时选择器的最小值
+    private static final int HOUR_SPINNER_MAX_VAL_12_HOUR_VIEW = 12; // 12小时制下小时选择器的最大值
+    private static final int MINUT_SPINNER_MIN_VAL = 0; // 分钟选择器的最小值
+    private static final int MINUT_SPINNER_MAX_VAL = 59; // 分钟选择器的最大值
+    private static final int AMPM_SPINNER_MIN_VAL = 0; // AM/PM选择器的最小值
+    private static final int AMPM_SPINNER_MAX_VAL = 1; // AM/PM选择器的最大值
+
+    private final NumberPicker mDateSpinner; // 日期选择器
+    private final NumberPicker mHourSpinner; // 小时选择器
+    private final NumberPicker mMinuteSpinner; // 分钟选择器
+    private final NumberPicker mAmPmSpinner; // AM/PM选择器
+    private Calendar mDate; // 存储日期的日历对象
+
+    private String[] mDateDisplayValues = new String[DAYS_IN_ALL_WEEK]; // 用于存储日期显示值的数组
+
+    private boolean mIsAm; // 存储当前是否为 AM 的标志
+
+    private boolean mIs24HourView; // 存储当前是否为24小时制的标志
+
+    private boolean mIsEnabled = DEFAULT_ENABLE_STATE; // 存储当前启用状态
+
+    private boolean mInitialising; // 存储初始化状态的标志
+
+    private OnDateTimeChangedListener mOnDateTimeChangedListener; // 日期时间改变的监听器
+
+    // 日期选择器值变化的监听器
+    private NumberPicker.OnValueChangeListener mOnDateChangedListener = new NumberPicker.OnValueChangeListener() {
+        @Override
+        public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
+            mDate.add(Calendar.DAY_OF_YEAR, newVal - oldVal); // 更新日期
+            updateDateControl(); // 更新日期控制
+            onDateTimeChanged(); // 通知日期时间已更改
+        }
+    };
+
+    // 小时选择器值变化的监听器
+    private NumberPicker.OnValueChangeListener mOnHourChangedListener = new NumberPicker.OnValueChangeListener() {
+        @Override
+        public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
+            boolean isDateChanged = false; // 标记日期是否变化
+            Calendar cal = Calendar.getInstance(); // 获取当前日期的日历对象
+            if (!mIs24HourView) { // 如果是 12 小时制
+                if (!mIsAm && oldVal == HOURS_IN_HALF_DAY - 1 && newVal == HOURS_IN_HALF_DAY) { // 从 PM 切换到 AM
+                    cal.setTimeInMillis(mDate.getTimeInMillis());
+                    cal.add(Calendar.DAY_OF_YEAR, 1); // 日期加 1
+                    isDateChanged = true; // 标记日期变化
+                } else if (mIsAm && oldVal == HOURS_IN_HALF_DAY && newVal == HOURS_IN_HALF_DAY - 1) { // 从 AM 切换到 PM
+                    cal.setTimeInMillis(mDate.getTimeInMillis());
+                    cal.add(Calendar.DAY_OF_YEAR, -1); // 日期减 1
+                    isDateChanged = true; // 标记日期变化
+                }
+                if (oldVal == HOURS_IN_HALF_DAY - 1 && newVal == HOURS_IN_HALF_DAY ||
+                        oldVal == HOURS_IN_HALF_DAY && newVal == HOURS_IN_HALF_DAY - 1) {
+                    mIsAm = !mIsAm; // 切换 AM/PM 状态
+                    updateAmPmControl(); // 更新 AM/PM 控制
+                }
+            } else { // 如果是 24 小时制
+                if (oldVal == HOURS_IN_ALL_DAY - 1 && newVal == 0) { // 从 23 切换到 0
+                    cal.setTimeInMillis(mDate.getTimeInMillis());
+                    cal.add(Calendar.DAY_OF_YEAR, 1); // 日期加 1
+                    isDateChanged = true; // 标记日期变化
+                } else if (oldVal == 0 && newVal == HOURS_IN_ALL_DAY - 1) { // 从 0 切换到 23
+                    cal.setTimeInMillis(mDate.getTimeInMillis());
+                    cal.add(Calendar.DAY_OF_YEAR, -1); // 日期减 1
+                    isDateChanged = true; // 标记日期变化
+                }
+            }
+            // 设置小时
+            int newHour = mHourSpinner.getValue() % HOURS_IN_HALF_DAY + (mIsAm ? 0 : HOURS_IN_HALF_DAY);
+            mDate.set(Calendar.HOUR_OF_DAY, newHour); // 更新日历中的小时
+            onDateTimeChanged(); // 通知日期时间已更改
+            if (isDateChanged) { // 如果日期变化，则更新日期
+                setCurrentYear(cal.get(Calendar.YEAR));
+                setCurrentMonth(cal.get(Calendar.MONTH));
+                setCurrentDay(cal.get(Calendar.DAY_OF_MONTH));
+            }
+        }
+    };
+
+    // 分钟选择器值变化的监听器
+    private NumberPicker.OnValueChangeListener mOnMinuteChangedListener = new NumberPicker.OnValueChangeListener() {
+        @Override
+        public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
+            int minValue = mMinuteSpinner.getMinValue(); // 获取分钟选择器的最小值
+            int maxValue = mMinuteSpinner.getMaxValue(); // 获取分钟选择器的最大值
+            int offset = 0; // 记录偏移量
+            if (oldVal == maxValue && newVal == minValue) {
+                offset += 1; // 增加偏移量
+            } else if (oldVal == minValue && newVal == maxValue) {
+                offset -= 1; // 减少偏移量
+            }
+            if (offset != 0) { // 如果偏移量不为零
+                mDate.add(Calendar.HOUR_OF_DAY, offset); // 更新小时
+                mHourSpinner.setValue(getCurrentHour()); // 更新小时选择器的值
+                updateDateControl(); // 更新日期控制
+                int newHour = getCurrentHourOfDay(); // 获取当前小时
+                // 更新 AM/PM 状态
+                if (newHour >= HOURS_IN_HALF_DAY) {
+                    mIsAm = false; // 设为 PM
+                    updateAmPmControl(); // 更新 AM/PM 控制
+                } else {
+                    mIsAm = true; // 设为 AM
+                    updateAmPmControl(); // 更新 AM/PM 控制
+                }
+            }
+            mDate.set(Calendar.MINUTE, newVal); // 更新日历中的分钟
+            onDateTimeChanged(); // 通知日期时间已更改
+        }
+    };
+
+    // AM/PM 选择器值变化的监听器
+    private NumberPicker.OnValueChangeListener mOnAmPmChangedListener = new NumberPicker.OnValueChangeListener() {
+        @Override
+        public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
+            mIsAm = !mIsAm; // 切换 AM/PM 状态
+            // 根据 AM/PM 状态更新小时
+            if (mIsAm) {
+                mDate.add(Calendar.HOUR_OF_DAY, -HOURS_IN_HALF_DAY); // 如果为 AM，减去 12 小时
+            } else {
+                mDate.add(Calendar.HOUR_OF_DAY, HOURS_IN_HALF_DAY); // 如果为 PM，加上 12 小时
+            }
+            updateAmPmControl(); // 更新 AM/PM 控制
+            onDateTimeChanged(); // 通知日期时间已更改
+        }
+    };
+
+    // 定义日期时间改变的监听器接口
+    public interface OnDateTimeChangedListener {
+        void onDateTimeChanged(DateTimePicker view, int year, int month,
+                int dayOfMonth, int hourOfDay, int minute); // 方法签名
+    }
+
+    // 构造函数，使用当前时间作为参数
+    public DateTimePicker(Context context) {
+        this(context, System.currentTimeMillis()); // 调用重载构造函数
+    }
+
+    public DateTimePicker(Context context, long date) {
+        this(context, date, DateFormat.is24HourFormat(context)); // 调用重载构造函数，并根据上下文判断是否为 24 小时制
+    }
+
+    public DateTimePicker(Context context, long date, boolean is24HourView) {
+        super(context); // 调用父类构造函数
+        mDate = Calendar.getInstance(); // 初始化当前日期
+        mInitialising = true; // 标记当前处于初始化状态
+        mIsAm = getCurrentHourOfDay() >= HOURS_IN_HALF_DAY; // 根据当前小时判断是否为 AM
+        inflate(context, R.layout.datetime_picker, this); // 加载布局文件
+
+        // 初始化日期选择器
+        mDateSpinner = (NumberPicker) findViewById(R.id.date);
+        mDateSpinner.setMinValue(DATE_SPINNER_MIN_VAL); // 设置最小值
+        mDateSpinner.setMaxValue(DATE_SPINNER_MAX_VAL); // 设置最大值
+        mDateSpinner.setOnValueChangedListener(mOnDateChangedListener); // 设置值变化监听器
+
+        // 初始化小时选择器
+        mHourSpinner = (NumberPicker) findViewById(R.id.hour);
+        mHourSpinner.setOnValueChangedListener(mOnHourChangedListener); // 设置值变化监听器
+
+        // 初始化分钟选择器
+        mMinuteSpinner =  (NumberPicker) findViewById(R.id.minute);
+        mMinuteSpinner.setMinValue(MINUT_SPINNER_MIN_VAL); // 设置最小值
+        mMinuteSpinner.setMaxValue(MINUT_SPINNER_MAX_VAL); // 设置最大值
+        mMinuteSpinner.setOnLongPressUpdateInterval(100); // 设置长按更新间隔
+        mMinuteSpinner.setOnValueChangedListener(mOnMinuteChangedListener); // 设置值变化监听器
+
+        // 初始化 AM/PM 选择器
+        String[] stringsForAmPm = new DateFormatSymbols().getAmPmStrings(); // 获取 AM/PM 字符串
+        mAmPmSpinner = (NumberPicker) findViewById(R.id.amPm);
+        mAmPmSpinner.setMinValue(AMPM_SPINNER_MIN_VAL); // 设置最小值
+        mAmPmSpinner.setMaxValue(AMPM_SPINNER_MAX_VAL); // 设置最大值
+        mAmPmSpinner.setDisplayedValues(stringsForAmPm); // 设置显示值
+        mAmPmSpinner.setOnValueChangedListener(mOnAmPmChangedListener); // 设置值变化监听器
+
+        // 更新控件到初始状态
+        updateDateControl(); // 更新日期选择器状态
+        updateHourControl(); // 更新小时选择器状态
+        updateAmPmControl(); // 更新 AM/PM 选择器状态
+
+        set24HourView(is24HourView); // 设置是否使用 24 小时制
+
+        // 设置为当前时间
+        setCurrentDate(date); // 设置当前日期为传入的日期
+
+        setEnabled(isEnabled()); // 设置选择器的启用状态
+
+        // 设置内容描述
+        mInitialising = false; // 标记初始化完成
+    }
+
+    @Override
+    public void setEnabled(boolean enabled) { // 重写设置启用状态的方法
+        if (mIsEnabled == enabled) { // 如果当前状态与目标状态相同，则返回
+            return; 
+        }
+        super.setEnabled(enabled); // 调用父类的设置启用方法
+        // 设置各个选择器的启用状态
+        mDateSpinner.setEnabled(enabled); 
+        mMinuteSpinner.setEnabled(enabled); 
+        mHourSpinner.setEnabled(enabled); 
+        mAmPmSpinner.setEnabled(enabled); 
+        mIsEnabled = enabled; // 更新当前启用状态
+    }
+
+    @Override
+    public boolean isEnabled() { // 重写获取启用状态的方法
+        return mIsEnabled; // 返回当前启用状态
+    }
+
+    /**
+     * 获取当前日期的毫秒值
+     *
+     * @return 当前日期的毫秒值
+     */
+    public long getCurrentDateInTimeMillis() {
+        return mDate.getTimeInMillis(); // 返回当前日期的毫秒表示
+    }
+
+    /**
+     * 设置当前日期
+     *
+     * @param date 当前日期的毫秒值
+     */
+    public void setCurrentDate(long date) {
+        Calendar cal = Calendar.getInstance(); // 获取当前日期的日历对象
+        cal.setTimeInMillis(date); // 将毫秒值设置到日历中
+        // 设置当前日期的年、月、日、小时和分钟
+        setCurrentDate(cal.get(Calendar.YEAR), cal.get(Calendar.MONTH), cal.get(Calendar.DAY_OF_MONTH),
+                cal.get(Calendar.HOUR_OF_DAY), cal.get(Calendar.MINUTE));
+    }
+
+    /**
+     * 设置当前日期
+     *
+     * @param year 当前年份
+     * @param month 当前月份
+     * @param dayOfMonth 当前日
+     * @param hourOfDay 当前小时
+     * @param minute 当前分钟
+     */
+    public void setCurrentDate(int year, int month,
+            int dayOfMonth, int hourOfDay, int minute) {
+        setCurrentYear(year); // 设置当前年份
+        setCurrentMonth(month); // 设置当前月份
+        setCurrentDay(dayOfMonth); // 设置当前日期
+        setCurrentHour(hourOfDay); // 设置当前小时
+        setCurrentMinute(minute); // 设置当前分钟
+    }
+
+    /**
+     * 获取当前年份
+     *
+     * @return 当前年份
+     */
+    public int getCurrentYear() {
+        return mDate.get(Calendar.YEAR); // 返回当前年份
+    }
+
+    /**
+     * 设置当前年份
+     *
+     * @param year 当前年份
+     */
+    public void setCurrentYear(int year) {
+        if (!mInitialising && year == getCurrentYear()) { // 如果不在初始化并且当前年份未变化，则返回
+            return;
+        }
+        mDate.set(Calendar.YEAR, year); // 更新日历中的年份
+        updateDateControl(); // 更新日期选择器控制
+        onDateTimeChanged(); // 通知日期时间已更改
+    }
+
+    /**
+     * 获取当前月份
+     *
+     * @return 当前月份
+     */
+    public int getCurrentMonth() {
+        return mDate.get(Calendar.MONTH); // 返回当前月份
+    }
+
+    /**
+     * 设置当前月份
+     *
+     * @param month 当前月份
+     */
+    public void setCurrentMonth(int month) {
+        if (!mInitialising && month == getCurrentMonth()) { // 如果不在初始化且当前月份未变化，则返回
+            return;
+        }
+        mDate.set(Calendar.MONTH, month); // 更新日历中的月份
+        updateDateControl(); // 更新日期控制
+        onDateTimeChanged(); // 通知日期时间已更改
+    }
+
+    /**
+     * 获取当前日期
+     *
+     * @return 当前日期
+     */
+    public int getCurrentDay() {
+        return mDate.get(Calendar.DAY_OF_MONTH); // 返回当前日期
+    }
+
+    /**
+     * 设置当前日期
+     *
+     * @param dayOfMonth 当前日期
+     */
+    public void setCurrentDay(int dayOfMonth) {
+        if (!mInitialising && dayOfMonth == getCurrentDay()) { // 如果不在初始化且当前日期未变化，则返回
+            return;
+        }
+        mDate.set(Calendar.DAY_OF_MONTH, dayOfMonth); // 更新日历中的日期
+        updateDateControl(); // 更新日期控制
+        onDateTimeChanged(); // 通知日期时间已更改
+    }
+
+    /**
+     * 获取当前小时
+     *
+     * @return 以 24 小时制表示的当前小时
+     */
+    public int getCurrentHourOfDay() {
+        return mDate.get(Calendar.HOUR_OF_DAY); // 返回当前 24 小时制的小时
+    }
+
+    private int getCurrentHour() { // 获取当前小时
+        if (mIs24HourView){ // 如果是 24 小时制
+            return getCurrentHourOfDay(); // 返回 24 小时制的当前小时
+        } else {
+            int hour = getCurrentHourOfDay(); // 获取当前小时
+            // 转换为 12 小时制
+            if (hour > HOURS_IN_HALF_DAY) {
+                return hour - HOURS_IN_HALF_DAY; 
+            } else {
+                return hour == 0 ? HOURS_IN_HALF_DAY : hour; // 处理 0 点的情况
+            }
+        }
+    }
+
+    /**
+     * 设置当前小时
+     *
+     * @param hourOfDay 当前小时
+     */
+    public void setCurrentHour(int hourOfDay) {
+        if (!mInitialising && hourOfDay == getCurrentHourOfDay()) { // 如果不在初始化且当前小时未变化，则返回
+            return;
+        }
+        mDate.set(Calendar.HOUR_OF_DAY, hourOfDay); // 更新日历中的小时
+        if (!mIs24HourView) { // 如果不是 24 小时制
+            if (hourOfDay >= HOURS_IN_HALF_DAY) { // 如果属于 PM
+                mIsAm = false; // 设置为 PM
+                if (hourOfDay > HOURS_IN_HALF_DAY) { // 如果小时大于 12
+                    hourOfDay -= HOURS_IN_HALF_DAY; // 转换为 12 小时制
+                }
+            } else { // 如果属于 AM
+                mIsAm = true; // 设置为 AM
+                if (hourOfDay == 0) { // 如果是 0 点
+                    hourOfDay = HOURS_IN_HALF_DAY; // 转换为 12 点
+                }
+            }
+            updateAmPmControl(); // 更新 AM/PM 控制
+        }
+        mHourSpinner.setValue(hourOfDay); // 更新小时选择器的值
+        onDateTimeChanged(); // 通知日期时间已更改
+    }
+
+    /**
+     * 获取当前分钟
+     *
+     * @return 当前分钟
+     */
+    public int getCurrentMinute() {
+        return mDate.get(Calendar.MINUTE); // 返回当前分钟
+    }
+
+    /**
+     * 设置当前分钟
+     *
+     * @param minute 当前分钟
+     */
+    public void setCurrentMinute(int minute) {
+        if (!mInitialising && minute == getCurrentMinute()) { // 如果不在初始化且当前分钟未变化，则返回
+            return;
+        }
+        mMinuteSpinner.setValue(minute); // 更新分钟选择器的值
+        mDate.set(Calendar.MINUTE, minute); // 更新日历中的分钟
+        onDateTimeChanged(); // 通知日期时间已更改
+    }
+
+    /**
+     * @return 如果在 24 小时制下返回 true，否则返回 false。
+     */
+    public boolean is24HourView () {
+        return mIs24HourView; // 返回当前是否在 24 小时制
+    }
+
+    /**
+     * 设置是否使用 24 小时制或 AM/PM 模式。
+     *
+     * @param is24HourView true 为 24 小时制，false 为 AM/PM 模式。
+     */
+    public void set24HourView(boolean is24HourView) {
+        if (mIs24HourView == is24HourView) { // 如果当前状态与目标状态相同则返回
+            return;
+        }
+        mIs24HourView = is24HourView; // 更新当前模式
+        mAmPmSpinner.setVisibility(is24HourView ? View.GONE : View.VISIBLE); // 根据模式设置 AM/PM 选择器的可见性
+        int hour = getCurrentHourOfDay(); // 获取当前小时
+        updateHourControl(); // 更新小时选择器状态
+        setCurrentHour(hour); // 设置当前小时
+        updateAmPmControl(); // 更新 AM/PM 控制
+    }
+
+    private void updateDateControl() { // 更新日期选择器状态
+        Calendar cal = Calendar.getInstance(); // 获取当前日期的日历对象
+        cal.setTimeInMillis(mDate.getTimeInMillis()); // 设置日历时间为当前选择的日期
+        cal.add(Calendar.DAY_OF_YEAR, -DAYS_IN_ALL_WEEK / 2 - 1); // 更新为起始值
+        mDateSpinner.setDisplayedValues(null); // 清空日期选择器的显示值
+        for (int i = 0; i < DAYS_IN_ALL_WEEK; ++i) { // 遍历一周的每一天
+            cal.add(Calendar.DAY_OF_YEAR, 1); // 遍历到下一天
+            mDateDisplayValues[i] = (String) DateFormat.format("MM.dd EEEE", cal); // 格式化日期
+        }
+        mDateSpinner.setDisplayedValues(mDateDisplayValues); // 设置日期选择器显示的值
+        mDateSpinner.setValue(DAYS_IN_ALL_WEEK / 2); // 设置日期选择器的默认值为一周中间的值
+        mDateSpinner.invalidate(); // 刷新日期选择器
+    }
+
+    private void updateAmPmControl() { // 更新 AM/PM 选择器状态
+        if (mIs24HourView) { // 如果为 24 小时制
+            mAmPmSpinner.setVisibility(View.GONE); // 隐藏 AM/PM 选择器
+        } else {
+            int index = mIsAm ? Calendar.AM : Calendar.PM; // 根据 AM/PM 标志获取索引
+            mAmPmSpinner.setValue(index); // 设置 AM/PM 选择器的值
+            mAmPmSpinner.setVisibility(View.VISIBLE); // 显示 AM/PM 选择器
+        }
+    }
+
+    private void updateHourControl() { // 更新小时选择器状态
+        if (mIs24HourView) { // 如果为 24 小时制
+            mHourSpinner.setMinValue(HOUR_SPINNER_MIN_VAL_24_HOUR_VIEW); // 设置 24 小时制的最小值
+            mHourSpinner.setMaxValue(HOUR_SPINNER_MAX_VAL_24_HOUR_VIEW); // 设置 24 小时制的最大值
+        } else {
+            mHourSpinner.setMinValue(HOUR_SPINNER_MIN_VAL_12_HOUR_VIEW); // 设置 12 小时制的最小值
+            mHourSpinner.setMaxValue(HOUR_SPINNER_MAX_VAL_12_HOUR_VIEW); // 设置 12 小时制的最大值
+        }
+    }
+
+    /**
+     * 设置回调函数，用于指示“设置”按钮已被按下。
+     * @param callback 回调函数，如果为 null 则不执行任何操作
+     */
+    public void setOnDateTimeChangedListener(OnDateTimeChangedListener callback) {
+        mOnDateTimeChangedListener = callback; // 更新监听器
+    }
+
+    private void onDateTimeChanged() { // 日期时间更改的处理方法
+        if (mOnDateTimeChangedListener != null) { // 如果有设置的监听器
+            mOnDateTimeChangedListener.onDateTimeChanged(this, getCurrentYear(), // 调用监听器的方法，传递当前的日期和时间
+                    getCurrentMonth(), getCurrentDay(), getCurrentHourOfDay(), getCurrentMinute());
+        }
+    }
+}

src/net/micode/notes/ui/DateTimePicker.java

@@ -0,0 +1,485 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui;
+
+import java.text.DateFormatSymbols;
+import java.util.Calendar;
+
+import net.micode.notes.R;
+
+
+import android.content.Context;
+import android.text.format.DateFormat;
+import android.view.View;
+import android.widget.FrameLayout;
+import android.widget.NumberPicker;
+
+public class DateTimePicker extends FrameLayout {
+
+    private static final boolean DEFAULT_ENABLE_STATE = true;
+
+    private static final int HOURS_IN_HALF_DAY = 12;
+    private static final int HOURS_IN_ALL_DAY = 24;
+    private static final int DAYS_IN_ALL_WEEK = 7;
+    private static final int DATE_SPINNER_MIN_VAL = 0;
+    private static final int DATE_SPINNER_MAX_VAL = DAYS_IN_ALL_WEEK - 1;
+    private static final int HOUR_SPINNER_MIN_VAL_24_HOUR_VIEW = 0;
+    private static final int HOUR_SPINNER_MAX_VAL_24_HOUR_VIEW = 23;
+    private static final int HOUR_SPINNER_MIN_VAL_12_HOUR_VIEW = 1;
+    private static final int HOUR_SPINNER_MAX_VAL_12_HOUR_VIEW = 12;
+    private static final int MINUT_SPINNER_MIN_VAL = 0;
+    private static final int MINUT_SPINNER_MAX_VAL = 59;
+    private static final int AMPM_SPINNER_MIN_VAL = 0;
+    private static final int AMPM_SPINNER_MAX_VAL = 1;
+
+    private final NumberPicker mDateSpinner;
+    private final NumberPicker mHourSpinner;
+    private final NumberPicker mMinuteSpinner;
+    private final NumberPicker mAmPmSpinner;
+    private Calendar mDate;
+
+    private String[] mDateDisplayValues = new String[DAYS_IN_ALL_WEEK];
+
+    private boolean mIsAm;
+
+    private boolean mIs24HourView;
+
+    private boolean mIsEnabled = DEFAULT_ENABLE_STATE;
+
+    private boolean mInitialising;
+
+    private OnDateTimeChangedListener mOnDateTimeChangedListener;
+
+    private NumberPicker.OnValueChangeListener mOnDateChangedListener = new NumberPicker.OnValueChangeListener() {
+        @Override
+        public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
+            mDate.add(Calendar.DAY_OF_YEAR, newVal - oldVal);
+            updateDateControl();
+            onDateTimeChanged();
+        }
+    };
+
+    private NumberPicker.OnValueChangeListener mOnHourChangedListener = new NumberPicker.OnValueChangeListener() {
+        @Override
+        public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
+            boolean isDateChanged = false;
+            Calendar cal = Calendar.getInstance();
+            if (!mIs24HourView) {
+                if (!mIsAm && oldVal == HOURS_IN_HALF_DAY - 1 && newVal == HOURS_IN_HALF_DAY) {
+                    cal.setTimeInMillis(mDate.getTimeInMillis());
+                    cal.add(Calendar.DAY_OF_YEAR, 1);
+                    isDateChanged = true;
+                } else if (mIsAm && oldVal == HOURS_IN_HALF_DAY && newVal == HOURS_IN_HALF_DAY - 1) {
+                    cal.setTimeInMillis(mDate.getTimeInMillis());
+                    cal.add(Calendar.DAY_OF_YEAR, -1);
+                    isDateChanged = true;
+                }
+                if (oldVal == HOURS_IN_HALF_DAY - 1 && newVal == HOURS_IN_HALF_DAY ||
+                        oldVal == HOURS_IN_HALF_DAY && newVal == HOURS_IN_HALF_DAY - 1) {
+                    mIsAm = !mIsAm;
+                    updateAmPmControl();
+                }
+            } else {
+                if (oldVal == HOURS_IN_ALL_DAY - 1 && newVal == 0) {
+                    cal.setTimeInMillis(mDate.getTimeInMillis());
+                    cal.add(Calendar.DAY_OF_YEAR, 1);
+                    isDateChanged = true;
+                } else if (oldVal == 0 && newVal == HOURS_IN_ALL_DAY - 1) {
+                    cal.setTimeInMillis(mDate.getTimeInMillis());
+                    cal.add(Calendar.DAY_OF_YEAR, -1);
+                    isDateChanged = true;
+                }
+            }
+            int newHour = mHourSpinner.getValue() % HOURS_IN_HALF_DAY + (mIsAm ? 0 : HOURS_IN_HALF_DAY);
+            mDate.set(Calendar.HOUR_OF_DAY, newHour);
+            onDateTimeChanged();
+            if (isDateChanged) {
+                setCurrentYear(cal.get(Calendar.YEAR));
+                setCurrentMonth(cal.get(Calendar.MONTH));
+                setCurrentDay(cal.get(Calendar.DAY_OF_MONTH));
+            }
+        }
+    };
+
+    private NumberPicker.OnValueChangeListener mOnMinuteChangedListener = new NumberPicker.OnValueChangeListener() {
+        @Override
+        public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
+            int minValue = mMinuteSpinner.getMinValue();
+            int maxValue = mMinuteSpinner.getMaxValue();
+            int offset = 0;
+            if (oldVal == maxValue && newVal == minValue) {
+                offset += 1;
+            } else if (oldVal == minValue && newVal == maxValue) {
+                offset -= 1;
+            }
+            if (offset != 0) {
+                mDate.add(Calendar.HOUR_OF_DAY, offset);
+                mHourSpinner.setValue(getCurrentHour());
+                updateDateControl();
+                int newHour = getCurrentHourOfDay();
+                if (newHour >= HOURS_IN_HALF_DAY) {
+                    mIsAm = false;
+                    updateAmPmControl();
+                } else {
+                    mIsAm = true;
+                    updateAmPmControl();
+                }
+            }
+            mDate.set(Calendar.MINUTE, newVal);
+            onDateTimeChanged();
+        }
+    };
+
+    private NumberPicker.OnValueChangeListener mOnAmPmChangedListener = new NumberPicker.OnValueChangeListener() {
+        @Override
+        public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
+            mIsAm = !mIsAm;
+            if (mIsAm) {
+                mDate.add(Calendar.HOUR_OF_DAY, -HOURS_IN_HALF_DAY);
+            } else {
+                mDate.add(Calendar.HOUR_OF_DAY, HOURS_IN_HALF_DAY);
+            }
+            updateAmPmControl();
+            onDateTimeChanged();
+        }
+    };
+
+    public interface OnDateTimeChangedListener {
+        void onDateTimeChanged(DateTimePicker view, int year, int month,
+                int dayOfMonth, int hourOfDay, int minute);
+    }
+
+    public DateTimePicker(Context context) {
+        this(context, System.currentTimeMillis());
+    }
+
+    public DateTimePicker(Context context, long date) {
+        this(context, date, DateFormat.is24HourFormat(context));
+    }
+
+    public DateTimePicker(Context context, long date, boolean is24HourView) {
+        super(context);
+        mDate = Calendar.getInstance();
+        mInitialising = true;
+        mIsAm = getCurrentHourOfDay() >= HOURS_IN_HALF_DAY;
+        inflate(context, R.layout.datetime_picker, this);
+
+        mDateSpinner = (NumberPicker) findViewById(R.id.date);
+        mDateSpinner.setMinValue(DATE_SPINNER_MIN_VAL);
+        mDateSpinner.setMaxValue(DATE_SPINNER_MAX_VAL);
+        mDateSpinner.setOnValueChangedListener(mOnDateChangedListener);
+
+        mHourSpinner = (NumberPicker) findViewById(R.id.hour);
+        mHourSpinner.setOnValueChangedListener(mOnHourChangedListener);
+        mMinuteSpinner =  (NumberPicker) findViewById(R.id.minute);
+        mMinuteSpinner.setMinValue(MINUT_SPINNER_MIN_VAL);
+        mMinuteSpinner.setMaxValue(MINUT_SPINNER_MAX_VAL);
+        mMinuteSpinner.setOnLongPressUpdateInterval(100);
+        mMinuteSpinner.setOnValueChangedListener(mOnMinuteChangedListener);
+
+        String[] stringsForAmPm = new DateFormatSymbols().getAmPmStrings();
+        mAmPmSpinner = (NumberPicker) findViewById(R.id.amPm);
+        mAmPmSpinner.setMinValue(AMPM_SPINNER_MIN_VAL);
+        mAmPmSpinner.setMaxValue(AMPM_SPINNER_MAX_VAL);
+        mAmPmSpinner.setDisplayedValues(stringsForAmPm);
+        mAmPmSpinner.setOnValueChangedListener(mOnAmPmChangedListener);
+
+        // update controls to initial state
+        updateDateControl();
+        updateHourControl();
+        updateAmPmControl();
+
+        set24HourView(is24HourView);
+
+        // set to current time
+        setCurrentDate(date);
+
+        setEnabled(isEnabled());
+
+        // set the content descriptions
+        mInitialising = false;
+    }
+
+    @Override
+    public void setEnabled(boolean enabled) {
+        if (mIsEnabled == enabled) {
+            return;
+        }
+        super.setEnabled(enabled);
+        mDateSpinner.setEnabled(enabled);
+        mMinuteSpinner.setEnabled(enabled);
+        mHourSpinner.setEnabled(enabled);
+        mAmPmSpinner.setEnabled(enabled);
+        mIsEnabled = enabled;
+    }
+
+    @Override
+    public boolean isEnabled() {
+        return mIsEnabled;
+    }
+
+    /**
+     * Get the current date in millis
+     *
+     * @return the current date in millis
+     */
+    public long getCurrentDateInTimeMillis() {
+        return mDate.getTimeInMillis();
+    }
+
+    /**
+     * Set the current date
+     *
+     * @param date The current date in millis
+     */
+    public void setCurrentDate(long date) {
+        Calendar cal = Calendar.getInstance();
+        cal.setTimeInMillis(date);
+        setCurrentDate(cal.get(Calendar.YEAR), cal.get(Calendar.MONTH), cal.get(Calendar.DAY_OF_MONTH),
+                cal.get(Calendar.HOUR_OF_DAY), cal.get(Calendar.MINUTE));
+    }
+
+    /**
+     * Set the current date
+     *
+     * @param year The current year
+     * @param month The current month
+     * @param dayOfMonth The current dayOfMonth
+     * @param hourOfDay The current hourOfDay
+     * @param minute The current minute
+     */
+    public void setCurrentDate(int year, int month,
+            int dayOfMonth, int hourOfDay, int minute) {
+        setCurrentYear(year);
+        setCurrentMonth(month);
+        setCurrentDay(dayOfMonth);
+        setCurrentHour(hourOfDay);
+        setCurrentMinute(minute);
+    }
+
+    /**
+     * Get current year
+     *
+     * @return The current year
+     */
+    public int getCurrentYear() {
+        return mDate.get(Calendar.YEAR);
+    }
+
+    /**
+     * Set current year
+     *
+     * @param year The current year
+     */
+    public void setCurrentYear(int year) {
+        if (!mInitialising && year == getCurrentYear()) {
+            return;
+        }
+        mDate.set(Calendar.YEAR, year);
+        updateDateControl();
+        onDateTimeChanged();
+    }
+
+    /**
+     * Get current month in the year
+     *
+     * @return The current month in the year
+     */
+    public int getCurrentMonth() {
+        return mDate.get(Calendar.MONTH);
+    }
+
+    /**
+     * Set current month in the year
+     *
+     * @param month The month in the year
+     */
+    public void setCurrentMonth(int month) {
+        if (!mInitialising && month == getCurrentMonth()) {
+            return;
+        }
+        mDate.set(Calendar.MONTH, month);
+        updateDateControl();
+        onDateTimeChanged();
+    }
+
+    /**
+     * Get current day of the month
+     *
+     * @return The day of the month
+     */
+    public int getCurrentDay() {
+        return mDate.get(Calendar.DAY_OF_MONTH);
+    }
+
+    /**
+     * Set current day of the month
+     *
+     * @param dayOfMonth The day of the month
+     */
+    public void setCurrentDay(int dayOfMonth) {
+        if (!mInitialising && dayOfMonth == getCurrentDay()) {
+            return;
+        }
+        mDate.set(Calendar.DAY_OF_MONTH, dayOfMonth);
+        updateDateControl();
+        onDateTimeChanged();
+    }
+
+    /**
+     * Get current hour in 24 hour mode, in the range (0~23)
+     * @return The current hour in 24 hour mode
+     */
+    public int getCurrentHourOfDay() {
+        return mDate.get(Calendar.HOUR_OF_DAY);
+    }
+
+    private int getCurrentHour() {
+        if (mIs24HourView){
+            return getCurrentHourOfDay();
+        } else {
+            int hour = getCurrentHourOfDay();
+            if (hour > HOURS_IN_HALF_DAY) {
+                return hour - HOURS_IN_HALF_DAY;
+            } else {
+                return hour == 0 ? HOURS_IN_HALF_DAY : hour;
+            }
+        }
+    }
+
+    /**
+     * Set current hour in 24 hour mode, in the range (0~23)
+     *
+     * @param hourOfDay
+     */
+    public void setCurrentHour(int hourOfDay) {
+        if (!mInitialising && hourOfDay == getCurrentHourOfDay()) {
+            return;
+        }
+        mDate.set(Calendar.HOUR_OF_DAY, hourOfDay);
+        if (!mIs24HourView) {
+            if (hourOfDay >= HOURS_IN_HALF_DAY) {
+                mIsAm = false;
+                if (hourOfDay > HOURS_IN_HALF_DAY) {
+                    hourOfDay -= HOURS_IN_HALF_DAY;
+                }
+            } else {
+                mIsAm = true;
+                if (hourOfDay == 0) {
+                    hourOfDay = HOURS_IN_HALF_DAY;
+                }
+            }
+            updateAmPmControl();
+        }
+        mHourSpinner.setValue(hourOfDay);
+        onDateTimeChanged();
+    }
+
+    /**
+     * Get currentMinute
+     *
+     * @return The Current Minute
+     */
+    public int getCurrentMinute() {
+        return mDate.get(Calendar.MINUTE);
+    }
+
+    /**
+     * Set current minute
+     */
+    public void setCurrentMinute(int minute) {
+        if (!mInitialising && minute == getCurrentMinute()) {
+            return;
+        }
+        mMinuteSpinner.setValue(minute);
+        mDate.set(Calendar.MINUTE, minute);
+        onDateTimeChanged();
+    }
+
+    /**
+     * @return true if this is in 24 hour view else false.
+     */
+    public boolean is24HourView () {
+        return mIs24HourView;
+    }
+
+    /**
+     * Set whether in 24 hour or AM/PM mode.
+     *
+     * @param is24HourView True for 24 hour mode. False for AM/PM mode.
+     */
+    public void set24HourView(boolean is24HourView) {
+        if (mIs24HourView == is24HourView) {
+            return;
+        }
+        mIs24HourView = is24HourView;
+        mAmPmSpinner.setVisibility(is24HourView ? View.GONE : View.VISIBLE);
+        int hour = getCurrentHourOfDay();
+        updateHourControl();
+        setCurrentHour(hour);
+        updateAmPmControl();
+    }
+
+    private void updateDateControl() {
+        Calendar cal = Calendar.getInstance();
+        cal.setTimeInMillis(mDate.getTimeInMillis());
+        cal.add(Calendar.DAY_OF_YEAR, -DAYS_IN_ALL_WEEK / 2 - 1);
+        mDateSpinner.setDisplayedValues(null);
+        for (int i = 0; i < DAYS_IN_ALL_WEEK; ++i) {
+            cal.add(Calendar.DAY_OF_YEAR, 1);
+            mDateDisplayValues[i] = (String) DateFormat.format("MM.dd EEEE", cal);
+        }
+        mDateSpinner.setDisplayedValues(mDateDisplayValues);
+        mDateSpinner.setValue(DAYS_IN_ALL_WEEK / 2);
+        mDateSpinner.invalidate();
+    }
+
+    private void updateAmPmControl() {
+        if (mIs24HourView) {
+            mAmPmSpinner.setVisibility(View.GONE);
+        } else {
+            int index = mIsAm ? Calendar.AM : Calendar.PM;
+            mAmPmSpinner.setValue(index);
+            mAmPmSpinner.setVisibility(View.VISIBLE);
+        }
+    }
+
+    private void updateHourControl() {
+        if (mIs24HourView) {
+            mHourSpinner.setMinValue(HOUR_SPINNER_MIN_VAL_24_HOUR_VIEW);
+            mHourSpinner.setMaxValue(HOUR_SPINNER_MAX_VAL_24_HOUR_VIEW);
+        } else {
+            mHourSpinner.setMinValue(HOUR_SPINNER_MIN_VAL_12_HOUR_VIEW);
+            mHourSpinner.setMaxValue(HOUR_SPINNER_MAX_VAL_12_HOUR_VIEW);
+        }
+    }
+
+    /**
+     * Set the callback that indicates the 'Set' button has been pressed.
+     * @param callback the callback, if null will do nothing
+     */
+    public void setOnDateTimeChangedListener(OnDateTimeChangedListener callback) {
+        mOnDateTimeChangedListener = callback;
+    }
+
+    private void onDateTimeChanged() {
+        if (mOnDateTimeChangedListener != null) {
+            mOnDateTimeChangedListener.onDateTimeChanged(this, getCurrentYear(),
+                    getCurrentMonth(), getCurrentDay(), getCurrentHourOfDay(), getCurrentMinute());
+        }
+    }
+}

src/net/micode/notes/ui/DateTimePickerDialog-note.java

@@ -0,0 +1,95 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui; // 定义包名
+
+import java.util.Calendar; // 导入日历类
+
+import net.micode.notes.R; // 导入资源类
+import net.micode.notes.ui.DateTimePicker; // 导入日期时间选择器类
+import net.micode.notes.ui.DateTimePicker.OnDateTimeChangedListener; // 导入日期时间改变监听器接口
+
+import android.app.AlertDialog; // 导入警告对话框类
+import android.content.Context; // 导入上下文类
+import android.content.DialogInterface; // 导入对话框接口
+import android.content.DialogInterface.OnClickListener; // 导入点击监听器接口
+import android.text.format.DateFormat; // 导入日期格式类
+import android.text.format.DateUtils; // 导入日期工具类
+
+public class DateTimePickerDialog extends AlertDialog implements OnClickListener { // 定义日期时间选择对话框类，继承自 AlertDialog，并实现 OnClickListener 接口
+
+    private Calendar mDate = Calendar.getInstance(); // 初始化当前日期的日历对象
+    private boolean mIs24HourView; // 存储当前是否为 24 小时制的标志
+    private OnDateTimeSetListener mOnDateTimeSetListener; // 日期时间设置监听器
+    private DateTimePicker mDateTimePicker; // 日期时间选择器实例
+
+    // 定义日期时间设置监听器接口
+    public interface OnDateTimeSetListener {
+        void OnDateTimeSet(AlertDialog dialog, long date); // 日期时间设置方法签名
+    }
+
+    // 构造函数，接受上下文和日期参数
+    public DateTimePickerDialog(Context context, long date) {
+        super(context); // 调用父类构造函数
+        mDateTimePicker = new DateTimePicker(context); // 创建日期时间选择器实例
+        setView(mDateTimePicker); // 设置对话框视图为日期时间选择器
+        mDateTimePicker.setOnDateTimeChangedListener(new OnDateTimeChangedListener() { // 设置日期时间改变监听器
+            public void onDateTimeChanged(DateTimePicker view, int year, int month,
+                    int dayOfMonth, int hourOfDay, int minute) { // 当日期时间改变时调用
+                mDate.set(Calendar.YEAR, year); // 更新日历中的年份
+                mDate.set(Calendar.MONTH, month); // 更新日历中的月份
+                mDate.set(Calendar.DAY_OF_MONTH, dayOfMonth); // 更新日历中的日期
+                mDate.set(Calendar.HOUR_OF_DAY, hourOfDay); // 更新日历中的小时
+                mDate.set(Calendar.MINUTE, minute); // 更新日历中的分钟
+                updateTitle(mDate.getTimeInMillis()); // 更新对话框标题
+            }
+        });
+        mDate.setTimeInMillis(date); // 设置日历的时间为传入的日期
+        mDate.set(Calendar.SECOND, 0); // 将秒设置为 0
+        mDateTimePicker.setCurrentDate(mDate.getTimeInMillis()); // 设置日期时间选择器的当前日期
+        setButton(context.getString(R.string.datetime_dialog_ok), this); // 设置确定按钮
+        setButton2(context.getString(R.string.datetime_dialog_cancel), (OnClickListener)null); // 设置取消按钮
+        set24HourView(DateFormat.is24HourFormat(this.getContext())); // 设置是否使用 24 小时制
+        updateTitle(mDate.getTimeInMillis()); // 更新对话框标题
+    }
+
+    // 设置 24 小时制模式
+    public void set24HourView(boolean is24HourView) {
+        mIs24HourView = is24HourView; // 更新 24 小时制标志
+    }
+
+    // 设置日期时间设置监听器
+    public void setOnDateTimeSetListener(OnDateTimeSetListener callBack) {
+        mOnDateTimeSetListener = callBack; // 更新监听器
+    }
+
+    // 更新对话框标题
+    private void updateTitle(long date) {
+        int flag = // 设置日期时间格式标志
+            DateUtils.FORMAT_SHOW_YEAR | // 显示年份
+            DateUtils.FORMAT_SHOW_DATE | // 显示日期
+            DateUtils.FORMAT_SHOW_TIME; // 显示时间
+        flag |= mIs24HourView ? DateUtils.FORMAT_24HOUR : DateUtils.FORMAT_12HOUR; // 根据模式添加相应的标志
+        setTitle(DateUtils.formatDateTime(this.getContext(), date, flag)); // 设置对话框标题为格式化的日期时间
+    }
+
+    // 点击事件处理
+    public void onClick(DialogInterface arg0, int arg1) {
+        if (mOnDateTimeSetListener != null) { // 如果有设置的监听器
+            mOnDateTimeSetListener.OnDateTimeSet(this, mDate.getTimeInMillis()); // 调用监听器方法，传递当前日期
+        }
+    }
+}

src/net/micode/notes/ui/DateTimePickerDialog.java

@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui;
+
+import java.util.Calendar;
+
+import net.micode.notes.R;
+import net.micode.notes.ui.DateTimePicker;
+import net.micode.notes.ui.DateTimePicker.OnDateTimeChangedListener;
+
+import android.app.AlertDialog;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.content.DialogInterface.OnClickListener;
+import android.text.format.DateFormat;
+import android.text.format.DateUtils;
+
+public class DateTimePickerDialog extends AlertDialog implements OnClickListener {
+
+    private Calendar mDate = Calendar.getInstance();
+    private boolean mIs24HourView;
+    private OnDateTimeSetListener mOnDateTimeSetListener;
+    private DateTimePicker mDateTimePicker;
+
+    public interface OnDateTimeSetListener {
+        void OnDateTimeSet(AlertDialog dialog, long date);
+    }
+
+    public DateTimePickerDialog(Context context, long date) {
+        super(context);
+        mDateTimePicker = new DateTimePicker(context);
+        setView(mDateTimePicker);
+        mDateTimePicker.setOnDateTimeChangedListener(new OnDateTimeChangedListener() {
+            public void onDateTimeChanged(DateTimePicker view, int year, int month,
+                    int dayOfMonth, int hourOfDay, int minute) {
+                mDate.set(Calendar.YEAR, year);
+                mDate.set(Calendar.MONTH, month);
+                mDate.set(Calendar.DAY_OF_MONTH, dayOfMonth);
+                mDate.set(Calendar.HOUR_OF_DAY, hourOfDay);
+                mDate.set(Calendar.MINUTE, minute);
+                updateTitle(mDate.getTimeInMillis());
+            }
+        });
+        mDate.setTimeInMillis(date);
+        mDate.set(Calendar.SECOND, 0);
+        mDateTimePicker.setCurrentDate(mDate.getTimeInMillis());
+        setButton(context.getString(R.string.datetime_dialog_ok), this);
+        setButton2(context.getString(R.string.datetime_dialog_cancel), (OnClickListener)null);
+        set24HourView(DateFormat.is24HourFormat(this.getContext()));
+        updateTitle(mDate.getTimeInMillis());
+    }
+
+    public void set24HourView(boolean is24HourView) {
+        mIs24HourView = is24HourView;
+    }
+
+    public void setOnDateTimeSetListener(OnDateTimeSetListener callBack) {
+        mOnDateTimeSetListener = callBack;
+    }
+
+    private void updateTitle(long date) {
+        int flag =
+            DateUtils.FORMAT_SHOW_YEAR |
+            DateUtils.FORMAT_SHOW_DATE |
+            DateUtils.FORMAT_SHOW_TIME;
+        flag |= mIs24HourView ? DateUtils.FORMAT_24HOUR : DateUtils.FORMAT_24HOUR;
+        setTitle(DateUtils.formatDateTime(this.getContext(), date, flag));
+    }
+
+    public void onClick(DialogInterface arg0, int arg1) {
+        if (mOnDateTimeSetListener != null) {
+            mOnDateTimeSetListener.OnDateTimeSet(this, mDate.getTimeInMillis());
+        }
+    }
+
+}

src/net/micode/notes/ui/DropdownMenu-note.java

@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui; // 定义包名
+
+import android.content.Context; // 导入上下文类
+import android.view.Menu; // 导入菜单类
+import android.view.MenuItem; // 导入菜单项类
+import android.view.View; // 导入视图类
+import android.view.View.OnClickListener; // 导入点击监听器接口
+import android.widget.Button; // 导入按钮类
+import android.widget.PopupMenu; // 导入弹出菜单类
+import android.widget.PopupMenu.OnMenuItemClickListener; // 导入弹出菜单项点击监听器接口
+
+import net.micode.notes.R; // 导入资源类
+
+public class DropdownMenu { // 定义下拉菜单类
+    private Button mButton; // 存储按钮对象
+    private PopupMenu mPopupMenu; // 存储弹出菜单对象
+    private Menu mMenu; // 存储菜单对象
+
+    // 构造函数，接受上下文、按钮和菜单资源 ID
+    public DropdownMenu(Context context, Button button, int menuId) {
+        mButton = button; // 初始化按钮
+        mButton.setBackgroundResource(R.drawable.dropdown_icon); // 设置按钮背景为下拉图标
+        mPopupMenu = new PopupMenu(context, mButton); // 创建弹出菜单，依附于指定按钮
+        mMenu = mPopupMenu.getMenu(); // 获取弹出菜单的菜单对象
+        mPopupMenu.getMenuInflater().inflate(menuId, mMenu); // 将指定的菜单资源填充到菜单对象中
+        mButton.setOnClickListener(new OnClickListener() { // 设置按钮点击监听器
+            public void onClick(View v) {
+                mPopupMenu.show(); // 显示弹出菜单
+            }
+        });
+    }
+
+    // 设置下拉菜单项点击监听器
+    public void setOnDropdownMenuItemClickListener(OnMenuItemClickListener listener) {
+        if (mPopupMenu != null) { // 如果弹出菜单不为空
+            mPopupMenu.setOnMenuItemClickListener(listener); // 设置菜单项点击监听器
+        }
+    }
+
+    // 根据 ID 查找菜单项
+    public MenuItem findItem(int id) {
+        return mMenu.findItem(id); // 根据 ID 返回菜单项
+    }
+
+    // 设置按钮的标题
+    public void setTitle(CharSequence title) {
+        mButton.setText(title); // 更新按钮文本为给定的标题
+    }
+}

src/net/micode/notes/ui/DropdownMenu.java

@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui;
+
+import android.content.Context;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.widget.Button;
+import android.widget.PopupMenu;
+import android.widget.PopupMenu.OnMenuItemClickListener;
+
+import net.micode.notes.R;
+
+public class DropdownMenu {
+    private Button mButton;
+    private PopupMenu mPopupMenu;
+    private Menu mMenu;
+
+    public DropdownMenu(Context context, Button button, int menuId) {
+        mButton = button;
+        mButton.setBackgroundResource(R.drawable.dropdown_icon);
+        mPopupMenu = new PopupMenu(context, mButton);
+        mMenu = mPopupMenu.getMenu();
+        mPopupMenu.getMenuInflater().inflate(menuId, mMenu);
+        mButton.setOnClickListener(new OnClickListener() {
+            public void onClick(View v) {
+                mPopupMenu.show();
+            }
+        });
+    }
+
+    public void setOnDropdownMenuItemClickListener(OnMenuItemClickListener listener) {
+        if (mPopupMenu != null) {
+            mPopupMenu.setOnMenuItemClickListener(listener);
+        }
+    }
+
+    public MenuItem findItem(int id) {
+        return mMenu.findItem(id);
+    }
+
+    public void setTitle(CharSequence title) {
+        mButton.setText(title);
+    }
+}

src/net/micode/notes/ui/FoldersListAdapter-note.java

@@ -0,0 +1,88 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui; // 定义包名
+
+import android.content.Context; // 导入上下文类
+import android.database.Cursor; // 导入游标类
+import android.view.View; // 导入视图类
+import android.view.ViewGroup; // 导入视图组类
+import android.widget.CursorAdapter; // 导入游标适配器类
+import android.widget.LinearLayout; // 导入线性布局类
+import android.widget.TextView; // 导入文本视图类
+
+import net.micode.notes.R; // 导入资源类
+import net.micode.notes.data.Notes; // 导入笔记数据类
+import net.micode.notes.data.Notes.NoteColumns; // 导入笔记列类
+
+public class FoldersListAdapter extends CursorAdapter { // 定义文件夹列表适配器类，继承自 CursorAdapter
+    public static final String [] PROJECTION = { // 定义需要查询的字段数组
+        NoteColumns.ID, // 笔记 ID 列
+        NoteColumns.SNIPPET // 笔记摘要列
+    };
+
+    public static final int ID_COLUMN   = 0; // ID 列索引
+    public static final int NAME_COLUMN = 1; // 名称列索引
+
+    // 构造函数，接受上下文和游标作为参数
+    public FoldersListAdapter(Context context, Cursor c) {
+        super(context, c); // 调用父类构造函数
+        // TODO Auto-generated constructor stub
+    }
+
+    // 创建新的视图
+    @Override
+    public View newView(Context context, Cursor cursor, ViewGroup parent) {
+        return new FolderListItem(context); // 返回新的文件夹列表项视图
+    }
+
+    // 绑定视图与数据
+    @Override
+    public void bindView(View view, Context context, Cursor cursor) {
+        if (view instanceof FolderListItem) { // 如果视图是 FolderListItem 的实例
+            // 获取文件夹名称，判断是否为根文件夹
+            String folderName = (cursor.getLong(ID_COLUMN) == Notes.ID_ROOT_FOLDER) ? context
+                    .getString(R.string.menu_move_parent_folder) : cursor.getString(NAME_COLUMN);
+            ((FolderListItem) view).bind(folderName); // 绑定文件夹名称到视图
+        }
+    }
+
+    // 根据位置获取文件夹名称
+    public String getFolderName(Context context, int position) {
+        Cursor cursor = (Cursor) getItem(position); // 获取指定位置的游标
+        // 判断是否为根文件夹，返回相应的名称
+        return (cursor.getLong(ID_COLUMN) == Notes.ID_ROOT_FOLDER) ? context
+                .getString(R.string.menu_move_parent_folder) : cursor.getString(NAME_COLUMN);
+    }
+
+    // 内部类，表示文件夹列表项
+    private class FolderListItem extends LinearLayout { // 继承自 LinearLayout
+        private TextView mName; // 存储文件夹名称的文本视图
+
+        // 构造函数，接受上下文作为参数
+        public FolderListItem(Context context) {
+            super(context); // 调用父类构造函数
+            inflate(context, R.layout.folder_list_item, this); // 加载布局文件
+            mName = (TextView) findViewById(R.id.tv_folder_name); // 初始化文件夹名称文本视图
+        }
+
+        // 绑定文件夹名称到文本视图
+        public void bind(String name) {
+            mName.setText(name); // 设置文本视图的文本为文件夹名称
+        }
+    }
+
+}

src/net/micode/notes/ui/FoldersListAdapter.java

@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui;
+
+import android.content.Context;
+import android.database.Cursor;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.CursorAdapter;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+
+import net.micode.notes.R;
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.NoteColumns;
+
+
+public class FoldersListAdapter extends CursorAdapter {
+    public static final String [] PROJECTION = {
+        NoteColumns.ID,
+        NoteColumns.SNIPPET
+    };
+
+    public static final int ID_COLUMN   = 0;
+    public static final int NAME_COLUMN = 1;
+
+    public FoldersListAdapter(Context context, Cursor c) {
+        super(context, c);
+        // TODO Auto-generated constructor stub
+    }
+
+    @Override
+    public View newView(Context context, Cursor cursor, ViewGroup parent) {
+        return new FolderListItem(context);
+    }
+
+    @Override
+    public void bindView(View view, Context context, Cursor cursor) {
+        if (view instanceof FolderListItem) {
+            String folderName = (cursor.getLong(ID_COLUMN) == Notes.ID_ROOT_FOLDER) ? context
+                    .getString(R.string.menu_move_parent_folder) : cursor.getString(NAME_COLUMN);
+            ((FolderListItem) view).bind(folderName);
+        }
+    }
+
+    public String getFolderName(Context context, int position) {
+        Cursor cursor = (Cursor) getItem(position);
+        return (cursor.getLong(ID_COLUMN) == Notes.ID_ROOT_FOLDER) ? context
+                .getString(R.string.menu_move_parent_folder) : cursor.getString(NAME_COLUMN);
+    }
+
+    private class FolderListItem extends LinearLayout {
+        private TextView mName;
+
+        public FolderListItem(Context context) {
+            super(context);
+            inflate(context, R.layout.folder_list_item, this);
+            mName = (TextView) findViewById(R.id.tv_folder_name);
+        }
+
+        public void bind(String name) {
+            mName.setText(name);
+        }
+    }
+
+}

src/net/micode/notes/ui/NoteEditActivity-note.java

@@ -0,0 +1,865 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui; // 定义包名
+
+import android.app.Activity; // 导入Activity类
+import android.app.AlarmManager; // 导入AlarmManager类
+import android.app.AlertDialog; // 导入AlertDialog类
+import android.app.PendingIntent; // 导入PendingIntent类
+import android.app.SearchManager; // 导入SearchManager类
+import android.appwidget.AppWidgetManager; // 导入AppWidgetManager类
+import android.content.ContentUris; // 导入ContentUris类
+import android.content.Context; // 导入Context类
+import android.content.DialogInterface; // 导入DialogInterface类
+import android.content.Intent; // 导入Intent类
+import android.content.SharedPreferences; // 导入SharedPreferences类
+import android.graphics.Paint; // 导入Paint类
+import android.os.Bundle; // 导入Bundle类
+import android.preference.PreferenceManager; // 导入PreferenceManager类
+import android.text.Spannable; // 导入Spannable类
+import android.text.SpannableString; // 导入SpannableString类
+import android.text.TextUtils; // 导入TextUtils类
+import android.text.format.DateUtils; // 导入DateUtils类
+import android.text.style.BackgroundColorSpan; // 导入BackgroundColorSpan类
+import android.util.Log; // 导入Log类
+import android.view.LayoutInflater; // 导入LayoutInflater类
+import android.view.Menu; // 导入Menu类
+import android.view.MenuItem; // 导入MenuItem类
+import android.view.MotionEvent; // 导入MotionEvent类
+import android.view.View; // 导入View类
+import android.view.ViewGroup; // 导入ViewGroup类
+import android.view.WindowManager; // 导入WindowManager类
+import android.widget.CheckBox; // 导入CheckBox类
+import android.widget.CompoundButton; // 导入CompoundButton类
+import android.widget.EditText; // 导入EditText类
+import android.widget.ImageView; // 导入ImageView类
+import android.widget.LinearLayout; // 导入LinearLayout类
+import android.widget.TextView; // 导入TextView类
+import android.widget.Toast; // 导入Toast类
+
+import net.micode.notes.R; // 导入资源类
+import net.micode.notes.data.Notes; // 导入Notes数据类
+import net.micode.notes.data.Notes.TextNote; // 导入笔记文本类
+import net.micode.notes.model.WorkingNote; // 导入WorkingNote模型类
+import net.micode.notes.model.WorkingNote.NoteSettingChangedListener; // 导入设置改变监听器接口
+import net.micode.notes.tool.DataUtils; // 导入数据工具类
+import net.micode.notes.tool.ResourceParser; // 导入资源解析工具类
+import net.micode.notes.tool.ResourceParser.TextAppearanceResources; // 导入文本外观资源
+import net.micode.notes.ui.DateTimePickerDialog.OnDateTimeSetListener; // 导入日期时间设置监听器接口
+import net.micode.notes.ui.NoteEditText.OnTextViewChangeListener; // 导入文本视图变化监听器接口
+import net.micode.notes.widget.NoteWidgetProvider_2x; // 导入 2x 笔记小部件提供者
+import net.micode.notes.widget.NoteWidgetProvider_4x; // 导入 4x 笔记小部件提供者
+
+import java.util.HashMap; // 导入HashMap类
+import java.util.HashSet; // 导入HashSet类
+import java.util.Map; // 导入Map接口
+import java.util.regex.Matcher; // 导入Matcher类
+import java.util.regex.Pattern; // 导入Pattern类
+
+
+public class NoteEditActivity extends Activity implements OnClickListener, // 定义NoteEditActivity类，继承Activity并实现点击监听和其他接口
+        NoteSettingChangedListener, OnTextViewChangeListener {
+    private class HeadViewHolder { // 内部类用于存储头部视图的信息
+        public TextView tvModified; // 修改日期文本视图
+
+        public ImageView ivAlertIcon; // 警告图标
+
+        public TextView tvAlertDate; // 警告日期文本视图
+
+        public ImageView ibSetBgColor; // 设置背景颜色的图标按钮
+    }
+
+    private static final Map<Integer, Integer> sBgSelectorBtnsMap = new HashMap<Integer, Integer>(); // 背景选择按钮映射
+    static { // 静态初始化块
+        sBgSelectorBtnsMap.put(R.id.iv_bg_yellow, ResourceParser.YELLOW); // 添加背景颜色与按钮的映射
+        sBgSelectorBtnsMap.put(R.id.iv_bg_red, ResourceParser.RED);
+        sBgSelectorBtnsMap.put(R.id.iv_bg_blue, ResourceParser.BLUE);
+        sBgSelectorBtnsMap.put(R.id.iv_bg_green, ResourceParser.GREEN);
+        sBgSelectorBtnsMap.put(R.id.iv_bg_white, ResourceParser.WHITE);
+    }
+
+    private static final Map<Integer, Integer> sBgSelectorSelectionMap = new HashMap<Integer, Integer>(); // 背景选择颜色选中映射
+    static {
+        sBgSelectorSelectionMap.put(ResourceParser.YELLOW, R.id.iv_bg_yellow_select); // 添加背景颜色与选中状态按钮的映射
+        sBgSelectorSelectionMap.put(ResourceParser.RED, R.id.iv_bg_red_select);
+        sBgSelectorSelectionMap.put(ResourceParser.BLUE, R.id.iv_bg_blue_select);
+        sBgSelectorSelectionMap.put(ResourceParser.GREEN, R.id.iv_bg_green_select);
+        sBgSelectorSelectionMap.put(ResourceParser.WHITE, R.id.iv_bg_white_select);
+    }
+
+    private static final Map<Integer, Integer> sFontSizeBtnsMap = new HashMap<Integer, Integer>(); // 字体大小按钮映射
+    static {
+        sFontSizeBtnsMap.put(R.id.ll_font_large, ResourceParser.TEXT_LARGE); // 添加字体大小与按钮的映射
+        sFontSizeBtnsMap.put(R.id.ll_font_small, ResourceParser.TEXT_SMALL);
+        sFontSizeBtnsMap.put(R.id.ll_font_normal, ResourceParser.TEXT_MEDIUM);
+        sFontSizeBtnsMap.put(R.id.ll_font_super, ResourceParser.TEXT_SUPER);
+    }
+
+    private static final Map<Integer, Integer> sFontSelectorSelectionMap = new HashMap<Integer, Integer>(); // 字体选择器选中映射
+    static {
+        sFontSelectorSelectionMap.put(ResourceParser.TEXT_LARGE, R.id.iv_large_select); // 添加字体大小与选中状态按钮的映射
+        sFontSelectorSelectionMap.put(ResourceParser.TEXT_SMALL, R.id.iv_small_select);
+        sFontSelectorSelectionMap.put(ResourceParser.TEXT_MEDIUM, R.id.iv_medium_select);
+        sFontSelectorSelectionMap.put(ResourceParser.TEXT_SUPER, R.id.iv_super_select);
+    }
+
+    private static final String TAG = "NoteEditActivity"; // 定义日志 TAG
+
+    private HeadViewHolder mNoteHeaderHolder; // 头部视图持有者
+
+    private View mHeadViewPanel; // 头部视图面板
+
+    private View mNoteBgColorSelector; // 笔记背景颜色选择视图
+
+    private View mFontSizeSelector; // 字体大小选择视图
+
+    private EditText mNoteEditor; // 笔记编辑器
+
+    private View mNoteEditorPanel; // 笔记编辑器面板
+
+    private WorkingNote mWorkingNote; // 当前正在编辑的笔记
+
+    private SharedPreferences mSharedPrefs; // 共享偏好设置
+
+    private int mFontSizeId; // 当前字体大小 ID
+
+    private static final String PREFERENCE_FONT_SIZE = "pref_font_size"; // 字体大小偏好设置键
+
+    private static final int SHORTCUT_ICON_TITLE_MAX_LEN = 10; // 快捷方式图标标题最大长度
+
+    public static final String TAG_CHECKED = String.valueOf('\u221A'); // 完成标记
+    public static final String TAG_UNCHECKED = String.valueOf('\u25A1'); // 未完成标记
+
+    private LinearLayout mEditTextList; // 编辑文本列表
+
+    private String mUserQuery; // 用户查询字符串
+    private Pattern mPattern; // 正则表达式模式
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) { // Activity 创建时调用
+        super.onCreate(savedInstanceState);
+        this.setContentView(R.layout.note_edit); // 设置内容视图为笔记编辑布局
+
+        if (savedInstanceState == null && !initActivityState(getIntent())) { // 如果没有保存的状态且初始化失败
+            finish(); // 结束Activity
+            return; // 返回
+        }
+        initResources(); // 初始化资源
+    }
+
+    /**
+     * 当前Activity可能在内存不足时被系统杀死。当再次加载此Activity时，应该恢复之前的状态
+     */
+    @Override
+    protected void onRestoreInstanceState(Bundle savedInstanceState) { // 当Activity状态恢复时调用
+        super.onRestoreInstanceState(savedInstanceState);
+        if (savedInstanceState != null && savedInstanceState.containsKey(Intent.EXTRA_UID)) { // 如果包含特定的ID
+            Intent intent = new Intent(Intent.ACTION_VIEW); // 创建查看意图
+            intent.putExtra(Intent.EXTRA_UID, savedInstanceState.getLong(Intent.EXTRA_UID)); // 添加ID到意图中
+            if (!initActivityState(intent)) { // 初始化Activity状态，若失败
+                finish(); // 结束Activity
+                return;
+            }
+            Log.d(TAG, "Restoring from killed activity"); // 日志输出
+        }
+    }
+
+    private boolean initActivityState(Intent intent) { // 初始化Activity状态的方法
+        /**
+         * 如果用户指定了{@link Intent#ACTION_VIEW}但未提供ID，
+         * 则跳转到NotesListActivity
+         */
+        mWorkingNote = null; // 清空笔记对象
+        if (TextUtils.equals(Intent.ACTION_VIEW, intent.getAction())) { // 如果Intent的操作是查看
+            long noteId = intent.getLongExtra(Intent.EXTRA_UID, 0); // 获取笔记ID
+            mUserQuery = ""; // 初始化用户查询字符串
+
+            /**
+             * 从搜索结果开始
+             */
+            if (intent.hasExtra(SearchManager.EXTRA_DATA_KEY)) { // 如果Intent包含搜索数据
+                noteId = Long.parseLong(intent.getStringExtra(SearchManager.EXTRA_DATA_KEY)); // 获取数据关键字
+                mUserQuery = intent.getStringExtra(SearchManager.USER_QUERY); // 获取用户查询字符串
+            }
+
+            if (!DataUtils.visibleInNoteDatabase(getContentResolver(), noteId, Notes.TYPE_NOTE)) { // 检查笔记是否可见
+                Intent jump = new Intent(this, NotesListActivity.class); // 创建跳转Intent
+                startActivity(jump); // 启动跳转Activity
+                showToast(R.string.error_note_not_exist); // 显示笔记不存在的提示
+                finish(); // 结束此Activity
+                return false; // 返回false
+            } else {
+                mWorkingNote = WorkingNote.load(this, noteId); // 加载正在编辑的笔记
+                if (mWorkingNote == null) { // 如果加载失败
+                    Log.e(TAG, "load note failed with note id" + noteId); // 日志错误输出
+                    finish(); // 结束此Activity
+                    return false; // 返回false
+                }
+            }
+            getWindow().setSoftInputMode( // 设置窗口输入模式
+                    WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN
+                            | WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);
+        } else if(TextUtils.equals(Intent.ACTION_INSERT_OR_EDIT, intent.getAction())) { // 如果Intent的操作是插入或编辑
+            // 新建笔记
+            long folderId = intent.getLongExtra(Notes.INTENT_EXTRA_FOLDER_ID, 0); // 获取文件夹ID
+            int widgetId = intent.getIntExtra(Notes.INTENT_EXTRA_WIDGET_ID, // 获取小部件ID
+                    AppWidgetManager.INVALID_APPWIDGET_ID);
+            int widgetType = intent.getIntExtra(Notes.INTENT_EXTRA_WIDGET_TYPE, // 获取小部件类型
+                    Notes.TYPE_WIDGET_INVALIDE);
+            int bgResId = intent.getIntExtra(Notes.INTENT_EXTRA_BACKGROUND_ID, // 获取背景资源ID
+                    ResourceParser.getDefaultBgId(this)); 
+
+            // 解析通话记录笔记
+            String phoneNumber = intent.getStringExtra(Intent.EXTRA_PHONE_NUMBER); // 获取电话号码
+            long callDate = intent.getLongExtra(Notes.INTENT_EXTRA_CALL_DATE, 0); // 获取通话日期
+            if (callDate != 0 && phoneNumber != null) { // 如果通话日期有效且电话号码不为空
+                if (TextUtils.isEmpty(phoneNumber)) { // 如果电话号码为空
+                    Log.w(TAG, "The call record number is null");
+                }
+                long noteId = 0; // 初始化笔记ID
+                if ((noteId = DataUtils.getNoteIdByPhoneNumberAndCallDate(getContentResolver(), // 根据电话号码和日期获取笔记ID
+                        phoneNumber, callDate)) > 0) {
+                    mWorkingNote = WorkingNote.load(this, noteId); // 加载已存在通话记录的笔记
+                    if (mWorkingNote == null) { // 如果加载失败
+                        Log.e(TAG, "load call note failed with note id" + noteId); // 日志错误输出
+                        finish(); // 结束此Activity
+                        return false; // 返回false
+                    }
+                } else {
+                    mWorkingNote = WorkingNote.createEmptyNote(this, folderId, widgetId, // 创建新笔记
+                            widgetType, bgResId);
+                    mWorkingNote.convertToCallNote(phoneNumber, callDate); // 转换为通话记录笔记
+                }
+            } else {
+                mWorkingNote = WorkingNote.createEmptyNote(this, folderId, widgetId, widgetType,
+                        bgResId); // 创建空笔记
+            }
+
+            getWindow().setSoftInputMode( // 设置窗口输入模式
+                    WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE
+                            | WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE);
+        } else {
+            Log.e(TAG, "Intent not specified action, should not support"); // 日志错误输出
+            finish(); // 结束Activity
+            return false; // 返回false
+        }
+        mWorkingNote.setOnSettingStatusChangedListener(this); // 设置修改状态监听器
+        return true; // 返回true
+    }
+
+    @Override
+    protected void onResume() { // 当Activity恢复时调用
+        super.onResume();
+        initNoteScreen(); // 初始化笔记屏幕
+    }
+
+    private void initNoteScreen() { // 初始化笔记屏幕的方法
+        mNoteEditor.setTextAppearance(this, TextAppearanceResources // 设置文本编辑器的样式
+                .getTexAppearanceResource(mFontSizeId));
+        if (mWorkingNote.getCheckListMode() == TextNote.MODE_CHECK_LIST) { // 如果是检查列表模式
+            switchToListMode(mWorkingNote.getContent()); // 切换到列表模式
+        } else {
+            mNoteEditor.setText(getHighlightQueryResult(mWorkingNote.getContent(), mUserQuery)); // 获取并设置高亮显示的文本
+            mNoteEditor.setSelection(mNoteEditor.getText().length()); // 将光标移动到文本末尾
+        }
+        for (Integer id : sBgSelectorSelectionMap.keySet()) { // 遍历背景选择器选中状态映射
+            findViewById(sBgSelectorSelectionMap.get(id)).setVisibility(View.GONE); // 隐藏所有选中状态
+        }
+        mHeadViewPanel.setBackgroundResource(mWorkingNote.getTitleBgResId()); // 设置头部视图背景
+        mNoteEditorPanel.setBackgroundResource(mWorkingNote.getBgColorResId()); // 设置编辑器面板背景
+
+        mNoteHeaderHolder.tvModified.setText(DateUtils.formatDateTime(this, // 显示修改日期
+                mWorkingNote.getModifiedDate(), DateUtils.FORMAT_SHOW_DATE
+                        | DateUtils.FORMAT_NUMERIC_DATE | DateUtils.FORMAT_SHOW_TIME
+                        | DateUtils.FORMAT_SHOW_YEAR));
+
+        /**
+         * TODO: 增加设置警告的菜单。当前禁用它，因为DateTimePicker
+         * 还没有准备好
+         */
+        showAlertHeader(); // 显示警报头
+    }
+
+    private void showAlertHeader() { // 显示警报头的方法
+        if (mWorkingNote.hasClockAlert()) { // 如果笔记有 clock 警报
+            long time = System.currentTimeMillis(); // 获取当前时间
+            if (time > mWorkingNote.getAlertDate()) { // 如果当前时间晚于警报设置时间
+                mNoteHeaderHolder.tvAlertDate.setText(R.string.note_alert_expired); // 更新文本为警报过期
+            } else {
+                mNoteHeaderHolder.tvAlertDate.setText(DateUtils.getRelativeTimeSpanString( // 设置警报距离当前时间的相对时间
+                        mWorkingNote.getAlertDate(), time, DateUtils.MINUTE_IN_MILLIS));
+            }
+            mNoteHeaderHolder.tvAlertDate.setVisibility(View.VISIBLE); // 显示警报日期
+            mNoteHeaderHolder.ivAlertIcon.setVisibility(View.VISIBLE); // 显示警报图标
+        } else {
+            mNoteHeaderHolder.tvAlertDate.setVisibility(View.GONE); // 隐藏警报日期
+            mNoteHeaderHolder.ivAlertIcon.setVisibility(View.GONE); // 隐藏警报图标
+        }
+    }
+
+    @Override
+    protected void onNewIntent(Intent intent) { // 当有新的Intent传入时调用
+        super.onNewIntent(intent);
+        initActivityState(intent); // 初始化Activity状态
+    }
+
+    @Override
+    protected void onSaveInstanceState(Bundle outState) { // 当保存Instance状态时调用
+        super.onSaveInstanceState(outState);
+        /**
+         * 对于没有笔记ID的新增笔记，我们需要先保存它以生成ID。
+         * 如果当前编辑的笔记不值得保存，则没有ID，等于创建新笔记
+         */
+        if (!mWorkingNote.existInDatabase()) {
+            saveNote(); // 保存笔记
+        }
+        outState.putLong(Intent.EXTRA_UID, mWorkingNote.getNoteId()); // 保存笔记ID
+        Log.d(TAG, "Save working note id: " + mWorkingNote.getNoteId() + " onSaveInstanceState"); // 日志输出
+    }
+
+    @Override
+    public boolean dispatchTouchEvent(MotionEvent ev) { // 处理触摸事件
+        if (mNoteBgColorSelector.getVisibility() == View.VISIBLE // 检查背景颜色选择器的可见性
+                && !inRangeOfView(mNoteBgColorSelector, ev)) { // 如果触摸事件不在该视图范围内
+            mNoteBgColorSelector.setVisibility(View.GONE); // 隐藏背景选择器
+            return true; // 返回true，表示事件已处理
+        }
+
+        if (mFontSizeSelector.getVisibility() == View.VISIBLE // 检查字体大小选择器的可见性
+                && !inRangeOfView(mFontSizeSelector, ev)) { // 如果触摸事件不在该视图范围内
+            mFontSizeSelector.setVisibility(View.GONE); // 隐藏字体选择器
+            return true; // 返回true，表示事件已处理
+        }
+        return super.dispatchTouchEvent(ev); // 调用父类方法处理其他触摸事件
+    }
+
+    private boolean inRangeOfView(View view, MotionEvent ev) { // 检查触摸事件是否在视图范围内
+        int []location = new int[2];
+        view.getLocationOnScreen(location); // 获取视图在屏幕上的位置
+        int x = location[0]; // 获取x坐标
+        int y = location[1]; // 获取y坐标
+        if (ev.getX() < x // 如果触摸点x坐标小于视图左上角x坐标
+                || ev.getX() > (x + view.getWidth()) // 或者触摸点x坐标大于视图右下角x坐标
+                || ev.getY() < y // 或者触摸点y坐标小于视图左上角y坐标
+                || ev.getY() > (y + view.getHeight())) { // 或者触摸点y坐标大于视图右下角y坐标
+                    return false; // 返回false，表示不在范围内
+                }
+        return true; // 返回true，表示在范围内
+    }
+
+    private void initResources() { // 初始化资源的方法
+        mHeadViewPanel = findViewById(R.id.note_title); // 查找头部视图
+        mNoteHeaderHolder = new HeadViewHolder(); // 初始化头部视图持有者
+        mNoteHeaderHolder.tvModified = (TextView) findViewById(R.id.tv_modified_date); // 查找修改日期文本视图
+        mNoteHeaderHolder.ivAlertIcon = (ImageView) findViewById(R.id.iv_alert_icon); // 查找警告图标
+        mNoteHeaderHolder.tvAlertDate = (TextView) findViewById(R.id.tv_alert_date); // 查找警告日期文本视图
+        mNoteHeaderHolder.ibSetBgColor = (ImageView) findViewById(R.id.btn_set_bg_color); // 查找设置背景颜色的图标按钮
+        mNoteHeaderHolder.ibSetBgColor.setOnClickListener(this); // 设置背景颜色按钮的点击监听器
+        mNoteEditor = (EditText) findViewById(R.id.note_edit_view); // 查找笔记编辑器
+        mNoteEditorPanel = findViewById(R.id.sv_note_edit); // 查找笔记编辑器面板
+        mNoteBgColorSelector = findViewById(R.id.note_bg_color_selector); // 查找笔记背景颜色选择视图
+        for (int id : sBgSelectorBtnsMap.keySet()) { // 遍历背景选择按钮映射
+            ImageView iv = (ImageView) findViewById(id); // 查找每个背景按钮
+            iv.setOnClickListener(this); // 设置每个按钮的点击监听器
+        }
+
+        mFontSizeSelector = findViewById(R.id.font_size_selector); // 查找字体大小选择视图
+        for (int id : sFontSizeBtnsMap.keySet()) { // 遍历字体大小按钮映射
+            View view = findViewById(id); // 查找每个字体按钮
+            view.setOnClickListener(this); // 设置每个按钮的点击监听器
+        };
+        mSharedPrefs = PreferenceManager.getDefaultSharedPreferences(this); // 获取默认共享偏好设置
+        mFontSizeId = mSharedPrefs.getInt(PREFERENCE_FONT_SIZE, ResourceParser.BG_DEFAULT_FONT_SIZE); // 获取字体大小
+        /**
+         * HACKME: 修复共享偏好中存储资源ID的错误。
+         * ID可能大于资源长度，这种情况下
+         * 返回{@link ResourceParser#BG_DEFAULT_FONT_SIZE}
+         */
+        if(mFontSizeId >= TextAppearanceResources.getResourcesSize()) { // 如果字体大小超出范围
+            mFontSizeId = ResourceParser.BG_DEFAULT_FONT_SIZE; // 设置为默认字体大小
+        }
+        mEditTextList = (LinearLayout) findViewById(R.id.note_edit_list); // 查找笔记编辑列表
+    }
+
+    @Override
+    protected void onPause() { // 当Activity暂停时调用
+        super.onPause();
+        if(saveNote()) { // 保存笔记
+            Log.d(TAG, "Note data was saved with length:" + mWorkingNote.getContent().length()); // 日志输出
+        }
+        clearSettingState(); // 清空设置状态
+    }
+
+    private void updateWidget() { // 更新小部件的方法
+        Intent intent = new Intent(AppWidgetManager.ACTION_APPWIDGET_UPDATE); // 创建更新小部件的Intent
+        if (mWorkingNote.getWidgetType() == Notes.TYPE_WIDGET_2X) { // 如果小部件是2x类型
+            intent.setClass(this, NoteWidgetProvider_2x.class); // 设置类为2x小部件提供者
+        } else if (mWorkingNote.getWidgetType() == Notes.TYPE_WIDGET_4X) { // 如果小部件是4x类型
+            intent.setClass(this, NoteWidgetProvider_4x.class); // 设置类为4x小部件提供者
+        } else {
+            Log.e(TAG, "Unspported widget type"); // 日志错误输出，表示不支持的小部件类型
+            return; // 返回
+        }
+
+        intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, new int[] { // 将小部件ID附加到Intent中
+            mWorkingNote.getWidgetId()
+        });
+
+        sendBroadcast(intent); // 发送广播以更新小部件
+        setResult(RESULT_OK, intent); // 设置返回结果为确定
+    }
+
+    public void onClick(View v) { // 点击事件处理
+        int id = v.getId(); // 获取点击视图的ID
+        if (id == R.id.btn_set_bg_color) { // 如果点击的是设置背景颜色按钮
+            mNoteBgColorSelector.setVisibility(View.VISIBLE); // 显示背景颜色选择器
+            findViewById(sBgSelectorSelectionMap.get(mWorkingNote.getBgColorId())).setVisibility(
+                    View.VISIBLE); // 显示当前选中的背景颜色
+        } else if (sBgSelectorBtnsMap.containsKey(id)) { // 如果点击的是背景选择按钮
+            findViewById(sBgSelectorSelectionMap.get(mWorkingNote.getBgColorId())).setVisibility(
+                    View.GONE); // 隐藏当前选中的背景颜色
+            mWorkingNote.setBgColorId(sBgSelectorBtnsMap.get(id)); // 设置所选的背景颜色ID
+            mNoteBgColorSelector.setVisibility(View.GONE); // 隐藏背景颜色选择器
+        } else if (sFontSizeBtnsMap.containsKey(id)) { // 如果点击的是字体大小选择按钮
+            findViewById(sFontSelectorSelectionMap.get(mFontSizeId)).setVisibility(View.GONE); // 隐藏当前选中的字体大小
+            mFontSizeId = sFontSizeBtnsMap.get(id); // 设置所选的字体大小ID
+            mSharedPrefs.edit().putInt(PREFERENCE_FONT_SIZE, mFontSizeId).commit(); // 更新共享偏好设置
+            findViewById(sFontSelectorSelectionMap.get(mFontSizeId)).setVisibility(View.VISIBLE); // 显示新选中的字体大小
+            if (mWorkingNote.getCheckListMode() == TextNote.MODE_CHECK_LIST) { // 如果是检查列表模式
+                getWorkingText(); // 获取当前工作文本
+                switchToListMode(mWorkingNote.getContent()); // 切换到列表模式
+            } else {
+                mNoteEditor.setTextAppearance(this, // 更新笔记编辑器的文本外观
+                        TextAppearanceResources.getTexAppearanceResource(mFontSizeId));
+            }
+            mFontSizeSelector.setVisibility(View.GONE); // 隐藏字体大小选择器
+        }
+    }
+
+    @Override
+    public void onBackPressed() { // 当返回按钮按下时调用
+        if(clearSettingState()) { // 如果有设置状态需要清空
+            return; // 返回
+        }
+
+        saveNote(); // 保存笔记
+        super.onBackPressed(); // 调用父类返回方法
+    }
+
+    private boolean clearSettingState() { // 清空设置状态
+        if (mNoteBgColorSelector.getVisibility() == View.VISIBLE) { // 如果背景颜色选择器可见
+            mNoteBgColorSelector.setVisibility(View.GONE); // 隐藏它
+            return true; // 返回true，表示有状态被处理
+        } else if (mFontSizeSelector.getVisibility() == View.VISIBLE) { // 如果字体大小选择器可见
+            mFontSizeSelector.setVisibility(View.GONE); // 隐藏它
+            return true; // 返回true，表示有状态被处理
+        }
+        return false; // 返回false，表示没有状态被处理
+    }
+
+    public void onBackgroundColorChanged() { // 背景颜色变化时更新视图
+        findViewById(sBgSelectorSelectionMap.get(mWorkingNote.getBgColorId())).setVisibility(
+                View.VISIBLE); // 显示新选中的背景颜色
+        mNoteEditorPanel.setBackgroundResource(mWorkingNote.getBgColorResId()); // 更新编辑面板的背景颜色
+        mHeadViewPanel.setBackgroundResource(mWorkingNote.getTitleBgResId()); // 更新头部视图的背景颜色
+    }
+
+    @Override
+    public boolean onPrepareOptionsMenu(Menu menu) { // 准备选项菜单
+        if (isFinishing()) { // 如果Activity正在结束
+            return true; // 返回true，表示不处理菜单
+        }
+        clearSettingState(); // 清空设置状态
+        menu.clear(); // 清空菜单
+        if (mWorkingNote.getFolderId() == Notes.ID_CALL_RECORD_FOLDER) { // 如果笔记位于通话记录文件夹
+            getMenuInflater().inflate(R.menu.call_note_edit, menu); // 加载通话记录编辑菜单
+        } else {
+            getMenuInflater().inflate(R.menu.note_edit, menu); // 加载笔记编辑菜单
+        }
+        if (mWorkingNote.getCheckListMode() == TextNote.MODE_CHECK_LIST) { // 如果是检查列表模式
+            menu.findItem(R.id.menu_list_mode).setTitle(R.string.menu_normal_mode); // 将菜单选项标题设置为正常模式
+        } else {
+            menu.findItem(R.id.menu_list_mode).setTitle(R.string.menu_list_mode); // 将菜单选项标题设置为列表模式
+        }
+        if (mWorkingNote.hasClockAlert()) { // 如果有时钟提醒
+            menu.findItem(R.id.menu_alert).setVisible(false); // 隐藏提醒菜单项
+        } else {
+            menu.findItem(R.id.menu_delete_remind).setVisible(false); // 隐藏删除提醒菜单项
+        }
+        return true; // 返回true，表示菜单准备成功
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) { // 处理菜单项选择
+        switch (item.getItemId()) { // 根据菜单项的ID执行相应操作
+            case R.id.menu_new_note: // 新建笔记菜单项
+                createNewNote(); // 创建新笔记
+                break;
+            case R.id.menu_delete: // 删除菜单项
+                AlertDialog.Builder builder = new AlertDialog.Builder(this); // 创建删除确认对话框构建器
+                builder.setTitle(getString(R.string.alert_title_delete)); // 设置对话框标题
+                builder.setIcon(android.R.drawable.ic_dialog_alert); // 设置对话框图标
+                builder.setMessage(getString(R.string.alert_message_delete_note)); // 设置对话框消息
+                builder.setPositiveButton(android.R.string.ok, // 设置确认按钮
+                        new DialogInterface.OnClickListener() {
+                            public void onClick(DialogInterface dialog, int which) {
+                                deleteCurrentNote(); // 删除当前笔记
+                                finish(); // 结束Activity
+                            }
+                        });
+                builder.setNegativeButton(android.R.string.cancel, null); // 设置取消按钮
+                builder.show(); // 显示对话框
+                break;
+            case R.id.menu_font_size: // 字体大小菜单项
+                mFontSizeSelector.setVisibility(View.VISIBLE); // 显示字体大小选择器
+                findViewById(sFontSelectorSelectionMap.get(mFontSizeId)).setVisibility(View.VISIBLE); // 显示当前选中的字体大小
+                break;
+            case R.id.menu_list_mode: // 切换到列表模式的菜单项
+                mWorkingNote.setCheckListMode(mWorkingNote.getCheckListMode() == 0 ?
+                        TextNote.MODE_CHECK_LIST : 0); // 切换检查列表模式
+                break;
+            case R.id.menu_share: // 分享菜单项
+                getWorkingText(); // 获取当前工作文本
+                sendTo(this, mWorkingNote.getContent()); // 发送文本到其他应用
+                break;
+            case R.id.menu_send_to_desktop: // 发送到桌面菜单项
+                sendToDesktop(); // 发送到桌面
+                break;
+            case R.id.menu_alert: // 设置提醒菜单项
+                setReminder(); // 设置提醒
+                break;
+            case R.id.menu_delete_remind: // 删除提醒菜单项
+                mWorkingNote.setAlertDate(0, false); // 清除警报日期
+                break;
+            default: // 默认情况
+                break;
+        }
+        return true; // 返回true，表示菜单项处理成功
+    }
+
+    private void setReminder() { // 设置提醒的方法
+        DateTimePickerDialog d = new DateTimePickerDialog(this, System.currentTimeMillis()); // 创建日期时间选择对话框
+        d.setOnDateTimeSetListener(new OnDateTimeSetListener() { // 设置对话框的日期时间设置监听器
+            public void OnDateTimeSet(AlertDialog dialog, long date) {
+                mWorkingNote.setAlertDate(date, true); // 设置笔记的警报日期
+            }
+        });
+        d.show(); // 显示对话框
+    }
+
+    /**
+     * 分享笔记到支持{@link Intent#ACTION_SEND}动作和{@text/plain}类型的应用
+     */
+    private void sendTo(Context context, String info) { // 发送文本到其他应用的方法
+        Intent intent = new Intent(Intent.ACTION_SEND); // 创建发送意图
+        intent.putExtra(Intent.EXTRA_TEXT, info); // 添加文本内容
+        intent.setType("text/plain"); // 设置Mime类型为纯文本
+        context.startActivity(intent); // 启动分享Activity
+    }
+
+    private void createNewNote() { // 创建新笔记的方法
+        // 首先保存当前正在编辑的笔记
+        saveNote(); // 保存笔记
+
+        // 为安全起见，启动新的NoteEditActivity
+        finish(); // 结束当前Activity
+        Intent intent = new Intent(this, NoteEditActivity.class); // 创建新的Intent
+        intent.setAction(Intent.ACTION_INSERT_OR_EDIT); // 设置动作为插入或编辑
+        intent.putExtra(Notes.INTENT_EXTRA_FOLDER_ID, mWorkingNote.getFolderId()); // 传递当前文件夹ID
+        startActivity(intent); // 启动新Activity
+    }
+
+    private void deleteCurrentNote() { // 删除当前笔记的方法
+        if (mWorkingNote.existInDatabase()) { // 如果笔记在数据库中存在
+            HashSet<Long> ids = new HashSet<Long>(); // 创建ID集合
+            long id = mWorkingNote.getNoteId(); // 获取当前笔记ID
+            if (id != Notes.ID_ROOT_FOLDER) { // 如果ID不是根文件夹ID
+                ids.add(id); // 将ID添加到集合
+            } else {
+                Log.d(TAG, "Wrong note id, should not happen"); // 日志输出错误信息
+            }
+            if (!isSyncMode()) { // 如果不是同步模式
+                if (!DataUtils.batchDeleteNotes(getContentResolver(), ids)) { // 批量删除笔记
+                    Log.e(TAG, "Delete Note error"); // 日志输出错误信息
+                }
+            } else { // 如果是同步模式
+                if (!DataUtils.batchMoveToFolder(getContentResolver(), ids, Notes.ID_TRASH_FOLER)) { // 批量移动到回收站
+                    Log.e(TAG, "Move notes to trash folder error, should not happens"); // 日志输出错误信息
+                }
+            }
+        }
+        mWorkingNote.markDeleted(true); // 标记笔记为已删除
+    }
+
+    private boolean isSyncMode() { // 判断是否是同步模式的方法
+        return NotesPreferenceActivity.getSyncAccountName(this).trim().length() > 0; // 如果同步账户名称不为空则返回true
+    }
+
+    public void onClockAlertChanged(long date, boolean set) { // 时钟提醒变化时调用的方法
+        /**
+         * 用户可能会将时钟设置到未保存的笔记上，因此在设置警报时
+         * 我们应该首先保存笔记
+         */
+        if (!mWorkingNote.existInDatabase()) { // 如果笔记不存在于数据库中
+            saveNote(); // 保存笔记
+        }
+        if (mWorkingNote.getNoteId() > 0) { // 如果笔记ID有效
+            Intent intent = new Intent(this, AlarmReceiver.class); // 创建闹钟接收器的Intent
+            intent.setData(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, mWorkingNote.getNoteId())); // 设置数据URI
+            PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent, 0); // 创建PendingIntent
+            AlarmManager alarmManager = ((AlarmManager) getSystemService(ALARM_SERVICE)); // 获取AlarmManager实例
+            showAlertHeader(); // 显示警报头
+            if (!set) { // 如果不设置警报
+                alarmManager.cancel(pendingIntent); // 取消警报
+            } else {
+                alarmManager.set(AlarmManager.RTC_WAKEUP, date, pendingIntent); // 设置警报
+            }
+        } else { // 如果当前笔记没有ID
+            /**
+             * 用户输入为空（笔记不值得保存），没有笔记ID，提示用户输入内容
+             */
+            Log.e(TAG, "Clock alert setting error"); // 日志输出错误信息
+            showToast(R.string.error_note_empty_for_clock); // 显示错误提示
+        }
+    }
+
+    public void onWidgetChanged() { // 当小部件变化时调用
+        updateWidget(); // 更新小部件
+    }
+
+    public void onEditTextDelete(int index, String text) { // 处理编辑文本删除的事件
+        int childCount = mEditTextList.getChildCount(); // 获取子视图数量
+        if (childCount == 1) { // 如果只有一个子视图
+            return; // 返回
+        }
+
+        for (int i = index + 1; i < childCount; i++) { // 从删除的索引开始遍历
+            ((NoteEditText) mEditTextList.getChildAt(i).findViewById(R.id.et_edit_text)) // 更新List中的索引
+                    .setIndex(i - 1);
+        }
+
+        mEditTextList.removeViewAt(index); // 移除指定索引的子视图
+        NoteEditText edit = null; // 初始化家编辑文本
+        if(index == 0) { // 如果删除的是第一个视图
+            edit = (NoteEditText) mEditTextList.getChildAt(0).findViewById(
+                    R.id.et_edit_text);
+        } else {
+            edit = (NoteEditText) mEditTextList.getChildAt(index - 1).findViewById(
+                    R.id.et_edit_text);
+        }
+        int length = edit.length(); // 获取被选中文字的长度
+        edit.append(text); // 在文本框中追加文本
+        edit.requestFocus(); // 请求焦点
+        edit.setSelection(length); // 设置光标位置到文本末尾
+    }
+
+    public void onEditTextEnter(int index, String text) { // 处理编辑文本输入的事件
+        /**
+         * 不应发生，检查以进行调试
+         */
+        if (index > mEditTextList.getChildCount()) { // 如果索引超出边界
+            Log.e(TAG, "Index out of mEditTextList boundrary, should not happen"); // 日志输出错误信息
+        }
+
+        View view = getListItem(text, index); // 获取新的列表项视图
+        mEditTextList.addView(view, index); // 在指定索引添加新视图
+        NoteEditText edit = (NoteEditText) view.findViewById(R.id.et_edit_text); // 查找新的NoteEditText
+        edit.requestFocus(); // 请求焦点
+        edit.setSelection(0); // 设置光标位置到文本开始处
+        for (int i = index + 1; i < mEditTextList.getChildCount(); i++) { // 遍历后续子视图
+            ((NoteEditText) mEditTextList.getChildAt(i).findViewById(R.id.et_edit_text)) // 更新前面的索引
+                    .setIndex(i);
+        }
+    }
+
+    private void switchToListMode(String text) { // 切换到列表模式并更新内容
+        mEditTextList.removeAllViews(); // 移除所有子视图
+        String[] items = text.split("\n"); // 按行分割笔记内容
+        int index = 0; // 索引初始化
+        for (String item : items) { // 遍历每一行
+            if (!TextUtils.isEmpty(item)) { // 如果行不为空
+                mEditTextList.addView(getListItem(item, index), index); // 将新的项目添加到列表
+                index++; // 增加索引
+            }
+        }
+        mEditTextList.addView(getListItem("", index)); // 添加空项
+        mEditTextList.getChildAt(index).findViewById(R.id.et_edit_text).requestFocus(); // 请求光标焦点到新添加的文本框
+
+        mNoteEditor.setVisibility(View.GONE); // 隐藏笔记编辑器
+        mEditTextList.setVisibility(View.VISIBLE); // 显示编辑文本列表
+    }
+
+    private Spannable getHighlightQueryResult(String fullText, String userQuery) { // 获取高亮结果的方法
+        SpannableString spannable = new SpannableString(fullText == null ? "" : fullText); // 创建可变化文本
+        if (!TextUtils.isEmpty(userQuery)) { // 如果用户查询不为空
+            mPattern = Pattern.compile(userQuery); // 编译用户查询为正则表达式
+            Matcher m = mPattern.matcher(fullText); // 创建匹配器
+            int start = 0; // 起始位置初始化
+            while (m.find(start)) { // 查找匹配项
+                spannable.setSpan( // 设置高亮背景
+                        new BackgroundColorSpan(this.getResources().getColor(
+                                R.color.user_query_highlight)), m.start(), m.end(),
+                        Spannable.SPAN_INCLUSIVE_EXCLUSIVE);
+                start = m.end(); // 更新起始位置
+            }
+        }
+        return spannable; // 返回高亮信息
+    }
+
+    private View getListItem(String item, int index) { // 获取列表项视图的方法
+        View view = LayoutInflater.from(this).inflate(R.layout.note_edit_list_item, null); // 加载列表项布局
+        final NoteEditText edit = (NoteEditText) view.findViewById(R.id.et_edit_text); // 查找文本编辑视图
+        edit.setTextAppearance(this, TextAppearanceResources.getTexAppearanceResource(mFontSizeId)); // 设置文本外观
+        CheckBox cb = ((CheckBox) view.findViewById(R.id.cb_edit_item)); // 查找复选框视图
+        cb.setOnCheckedChangeListener(new OnCheckedChangeListener() { // 设置复选框勾选变化监听器
+            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { // 勾选变化时调用
+                if (isChecked) { // 如果被勾选
+                    edit.setPaintFlags(edit.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG); // 在文本上添加划线
+                } else { // 如果未勾选
+                    edit.setPaintFlags(Paint.ANTI_ALIAS_FLAG | Paint.DEV_KERN_TEXT_FLAG); // 去除划线
+                }
+            }
+        });
+
+        // 根据是否已勾选更新复选框和文本
+        if (item.startsWith(TAG_CHECKED)) { // 如果以已完成标记开头
+            cb.setChecked(true); // 设置复选框为勾选
+            edit.setPaintFlags(edit.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG); // 添加划线
+            item = item.substring(TAG_CHECKED.length(), item.length()).trim(); // 移除标记
+        } else if (item.startsWith(TAG_UNCHECKED)) { // 如果以未完成标记开头
+            cb.setChecked(false); // 设置复选框为未勾选
+            edit.setPaintFlags(Paint.ANTI_ALIAS_FLAG | Paint.DEV_KERN_TEXT_FLAG); // 去除划线
+            item = item.substring(TAG_UNCHECKED.length(), item.length()).trim(); // 移除标记
+        }
+
+        edit.setOnTextViewChangeListener(this); // 设置文本变化监听器
+        edit.setIndex(index); // 设置索引
+        edit.setText(getHighlightQueryResult(item, mUserQuery)); // 设置高亮显示的文本
+        return view; // 返回视图
+    }
+
+    public void onTextChange(int index, boolean hasText) { // 文本变化时调用
+        if (index >= mEditTextList.getChildCount()) { // 如果索引超出范围
+            Log.e(TAG, "Wrong index, should not happen"); // 日志输出错误
+            return; // 返回
+        }
+        if (hasText) { // 如果有文本
+            mEditTextList.getChildAt(index).findViewById(R.id.cb_edit_item).setVisibility(View.VISIBLE); // 显示复选框
+        } else { // 如果没有文本
+            mEditTextList.getChildAt(index).findViewById(R.id.cb_edit_item).setVisibility(View.GONE); // 隐藏复选框
+        }
+    }
+
+    public void onCheckListModeChanged(int oldMode, int newMode) { // 检查列表模式变化时调用
+        if (newMode == TextNote.MODE_CHECK_LIST) { // 如果新模式是检查列表
+            switchToListMode(mNoteEditor.getText().toString()); // 切换到列表模式
+        } else { // 否则
+            if (!getWorkingText()) { // 获取当前工作文本，并检查文本是否存在
+                mWorkingNote.setWorkingText(mWorkingNote.getContent().replace(TAG_UNCHECKED + " ", "")); // 设置工作文本
+            }
+            mNoteEditor.setText(getHighlightQueryResult(mWorkingNote.getContent(), mUserQuery)); // 设置高亮显示文本
+            mEditTextList.setVisibility(View.GONE); // 隐藏编辑文本列表
+            mNoteEditor.setVisibility(View.VISIBLE); // 显示笔记编辑器
+        }
+    }
+
+    private boolean getWorkingText() { // 获取当前工作文本并更新状态
+        boolean hasChecked = false; // 标记是否有勾选
+        if (mWorkingNote.getCheckListMode() == TextNote.MODE_CHECK_LIST) { // 如果是检查列表模式
+            StringBuilder sb = new StringBuilder(); // 创建字符串构建器
+            for (int i = 0; i < mEditTextList.getChildCount(); i++) { // 循环获取每个子视图
+                View view = mEditTextList.getChildAt(i); // 获取子视图
+                NoteEditText edit = (NoteEditText) view.findViewById(R.id.et_edit_text); // 获取文本编辑视图
+                if (!TextUtils.isEmpty(edit.getText())) { // 如果文本不为空
+                    if (((CheckBox) view.findViewById(R.id.cb_edit_item)).isChecked()) { // 如果复选框已勾选
+                        sb.append(TAG_CHECKED).append(" ").append(edit.getText()).append("\n"); // 添加勾选标记和文本
+                        hasChecked = true; // 更新已勾选标记
+                    } else {
+                        sb.append(TAG_UNCHECKED).append(" ").append(edit.getText()).append("\n"); // 添加未勾选标记和文本
+                    }
+                }
+            }
+            mWorkingNote.setWorkingText(sb.toString()); // 设置工作文本
+        } else {
+            mWorkingNote.setWorkingText(mNoteEditor.getText().toString()); // 设置工作文本为笔记编辑器文本
+        }
+        return hasChecked; // 返回是否有勾选
+    }
+
+    private boolean saveNote() { // 保存笔记的方法
+        getWorkingText(); // 获取当前工作文本
+        boolean saved = mWorkingNote.saveNote(); // 尝试保存笔记
+        if (saved) { // 如果保存成功
+            /**
+             * 当从列表视图到编辑视图时，有两种模式，一个是打开笔记
+             * 另一个是创建/编辑节点。打开节点需要在返回编辑视图时
+             * 记录原位置，而创建新节点则需要在列表顶部。
+             * 这段代码RESULT_OK用于标识创建/编辑状态
+             */
+            setResult(RESULT_OK); // 设置结果为成功
+        }
+        return saved; // 返回保存状态
+    }
+
+    private void sendToDesktop() { // 发送到桌面的方法
+        /**
+         * 在发送消息到主屏幕前，我们应确保当前
+         * 编辑的笔记存在于数据库中。因此，对于新笔记，先保存它
+         */
+        if (!mWorkingNote.existInDatabase()) { // 如果笔记在数据库中不存在
+            saveNote(); // 保存笔记
+        }
+
+        if (mWorkingNote.getNoteId() > 0) { // 如果笔记ID有效
+            Intent sender = new Intent(); // 创建发送意图
+            Intent shortcutIntent = new Intent(this, NoteEditActivity.class); // 创建快捷方式意图
+            shortcutIntent.setAction(Intent.ACTION_VIEW); // 设置快捷方式的操作为查看
+            shortcutIntent.putExtra(Intent.EXTRA_UID, mWorkingNote.getNoteId()); // 添加笔记ID到意图
+            sender.putExtra(Intent.EXTRA_SHORTCUT_INTENT, shortcutIntent); // 添加快捷方式目标意图
+            sender.putExtra(Intent.EXTRA_SHORTCUT_NAME, // 添加快捷方式名称
+                    makeShortcutIconTitle(mWorkingNote.getContent()));
+            sender.putExtra(Intent.EXTRA_SHORTCUT_ICON_RESOURCE, // 添加快捷方式图标资源
+                    Intent.ShortcutIconResource.fromContext(this, R.drawable.icon_app));
+            sender.putExtra("duplicate", true); // 设置重复属性为true
+            sender.setAction("com.android.launcher.action.INSTALL_SHORTCUT"); // 设置操作为安装快捷方式
+            showToast(R.string.info_note_enter_desktop); // 显示信息提示
+            sendBroadcast(sender); // 发送广播以安装快捷方式
+        } else { // 如果笔记不存在（例如，新笔记没有内容）
+            /**
+             * 如果用户没有输入任何内容（此笔记不值得保存），则没有笔记ID，
+             * 提醒用户应该输入内容
+             */
+            Log.e(TAG, "Send to desktop error"); // 日志输出错误信息
+            showToast(R.string.error_note_empty_for_send_to_desktop); // 显示错误提示
+        }
+    }
+
+    private String makeShortcutIconTitle(String content) { // 制作快捷方式图标标题的方法
+        content = content.replace(TAG_CHECKED, ""); // 移除已勾选标记
+        content = content.replace(TAG_UNCHECKED, ""); // 移除未勾选标记
+        return content.length() > SHORTCUT_ICON_TITLE_MAX_LEN ? content.substring(0, // 如果内容超过最大长度，则截断
+                SHORTCUT_ICON_TITLE_MAX_LEN) : content;
+    }
+
+    private void showToast(int resId) { // 显示提示消息的方法
+        showToast(resId, Toast.LENGTH_SHORT); // 默认短时间显示
+    }
+
+    private void showToast(int resId, int duration) { // 自定义显示提示消息的方法
+        Toast.makeText(this, resId, duration).show(); // 显示Toast消息
+    }
+}

src/net/micode/notes/ui/NoteEditActivity.java

@@ -0,0 +1,873 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui;
+
+import android.app.Activity;
+import android.app.AlarmManager;
+import android.app.AlertDialog;
+import android.app.PendingIntent;
+import android.app.SearchManager;
+import android.appwidget.AppWidgetManager;
+import android.content.ContentUris;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.content.Intent;
+import android.content.SharedPreferences;
+import android.graphics.Paint;
+import android.os.Bundle;
+import android.preference.PreferenceManager;
+import android.text.Spannable;
+import android.text.SpannableString;
+import android.text.TextUtils;
+import android.text.format.DateUtils;
+import android.text.style.BackgroundColorSpan;
+import android.util.Log;
+import android.view.LayoutInflater;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.view.MotionEvent;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.view.WindowManager;
+import android.widget.CheckBox;
+import android.widget.CompoundButton;
+import android.widget.CompoundButton.OnCheckedChangeListener;
+import android.widget.EditText;
+import android.widget.ImageView;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import net.micode.notes.R;
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.TextNote;
+import net.micode.notes.model.WorkingNote;
+import net.micode.notes.model.WorkingNote.NoteSettingChangedListener;
+import net.micode.notes.tool.DataUtils;
+import net.micode.notes.tool.ResourceParser;
+import net.micode.notes.tool.ResourceParser.TextAppearanceResources;
+import net.micode.notes.ui.DateTimePickerDialog.OnDateTimeSetListener;
+import net.micode.notes.ui.NoteEditText.OnTextViewChangeListener;
+import net.micode.notes.widget.NoteWidgetProvider_2x;
+import net.micode.notes.widget.NoteWidgetProvider_4x;
+
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+
+public class NoteEditActivity extends Activity implements OnClickListener,
+        NoteSettingChangedListener, OnTextViewChangeListener {
+    private class HeadViewHolder {
+        public TextView tvModified;
+
+        public ImageView ivAlertIcon;
+
+        public TextView tvAlertDate;
+
+        public ImageView ibSetBgColor;
+    }
+
+    private static final Map<Integer, Integer> sBgSelectorBtnsMap = new HashMap<Integer, Integer>();
+    static {
+        sBgSelectorBtnsMap.put(R.id.iv_bg_yellow, ResourceParser.YELLOW);
+        sBgSelectorBtnsMap.put(R.id.iv_bg_red, ResourceParser.RED);
+        sBgSelectorBtnsMap.put(R.id.iv_bg_blue, ResourceParser.BLUE);
+        sBgSelectorBtnsMap.put(R.id.iv_bg_green, ResourceParser.GREEN);
+        sBgSelectorBtnsMap.put(R.id.iv_bg_white, ResourceParser.WHITE);
+    }
+
+    private static final Map<Integer, Integer> sBgSelectorSelectionMap = new HashMap<Integer, Integer>();
+    static {
+        sBgSelectorSelectionMap.put(ResourceParser.YELLOW, R.id.iv_bg_yellow_select);
+        sBgSelectorSelectionMap.put(ResourceParser.RED, R.id.iv_bg_red_select);
+        sBgSelectorSelectionMap.put(ResourceParser.BLUE, R.id.iv_bg_blue_select);
+        sBgSelectorSelectionMap.put(ResourceParser.GREEN, R.id.iv_bg_green_select);
+        sBgSelectorSelectionMap.put(ResourceParser.WHITE, R.id.iv_bg_white_select);
+    }
+
+    private static final Map<Integer, Integer> sFontSizeBtnsMap = new HashMap<Integer, Integer>();
+    static {
+        sFontSizeBtnsMap.put(R.id.ll_font_large, ResourceParser.TEXT_LARGE);
+        sFontSizeBtnsMap.put(R.id.ll_font_small, ResourceParser.TEXT_SMALL);
+        sFontSizeBtnsMap.put(R.id.ll_font_normal, ResourceParser.TEXT_MEDIUM);
+        sFontSizeBtnsMap.put(R.id.ll_font_super, ResourceParser.TEXT_SUPER);
+    }
+
+    private static final Map<Integer, Integer> sFontSelectorSelectionMap = new HashMap<Integer, Integer>();
+    static {
+        sFontSelectorSelectionMap.put(ResourceParser.TEXT_LARGE, R.id.iv_large_select);
+        sFontSelectorSelectionMap.put(ResourceParser.TEXT_SMALL, R.id.iv_small_select);
+        sFontSelectorSelectionMap.put(ResourceParser.TEXT_MEDIUM, R.id.iv_medium_select);
+        sFontSelectorSelectionMap.put(ResourceParser.TEXT_SUPER, R.id.iv_super_select);
+    }
+
+    private static final String TAG = "NoteEditActivity";
+
+    private HeadViewHolder mNoteHeaderHolder;
+
+    private View mHeadViewPanel;
+
+    private View mNoteBgColorSelector;
+
+    private View mFontSizeSelector;
+
+    private EditText mNoteEditor;
+
+    private View mNoteEditorPanel;
+
+    private WorkingNote mWorkingNote;
+
+    private SharedPreferences mSharedPrefs;
+    private int mFontSizeId;
+
+    private static final String PREFERENCE_FONT_SIZE = "pref_font_size";
+
+    private static final int SHORTCUT_ICON_TITLE_MAX_LEN = 10;
+
+    public static final String TAG_CHECKED = String.valueOf('\u221A');
+    public static final String TAG_UNCHECKED = String.valueOf('\u25A1');
+
+    private LinearLayout mEditTextList;
+
+    private String mUserQuery;
+    private Pattern mPattern;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        this.setContentView(R.layout.note_edit);
+
+        if (savedInstanceState == null && !initActivityState(getIntent())) {
+            finish();
+            return;
+        }
+        initResources();
+    }
+
+    /**
+     * Current activity may be killed when the memory is low. Once it is killed, for another time
+     * user load this activity, we should restore the former state
+     */
+    @Override
+    protected void onRestoreInstanceState(Bundle savedInstanceState) {
+        super.onRestoreInstanceState(savedInstanceState);
+        if (savedInstanceState != null && savedInstanceState.containsKey(Intent.EXTRA_UID)) {
+            Intent intent = new Intent(Intent.ACTION_VIEW);
+            intent.putExtra(Intent.EXTRA_UID, savedInstanceState.getLong(Intent.EXTRA_UID));
+            if (!initActivityState(intent)) {
+                finish();
+                return;
+            }
+            Log.d(TAG, "Restoring from killed activity");
+        }
+    }
+
+    private boolean initActivityState(Intent intent) {
+        /**
+         * If the user specified the {@link Intent#ACTION_VIEW} but not provided with id,
+         * then jump to the NotesListActivity
+         */
+        mWorkingNote = null;
+        if (TextUtils.equals(Intent.ACTION_VIEW, intent.getAction())) {
+            long noteId = intent.getLongExtra(Intent.EXTRA_UID, 0);
+            mUserQuery = "";
+
+            /**
+             * Starting from the searched result
+             */
+            if (intent.hasExtra(SearchManager.EXTRA_DATA_KEY)) {
+                noteId = Long.parseLong(intent.getStringExtra(SearchManager.EXTRA_DATA_KEY));
+                mUserQuery = intent.getStringExtra(SearchManager.USER_QUERY);
+            }
+
+            if (!DataUtils.visibleInNoteDatabase(getContentResolver(), noteId, Notes.TYPE_NOTE)) {
+                Intent jump = new Intent(this, NotesListActivity.class);
+                startActivity(jump);
+                showToast(R.string.error_note_not_exist);
+                finish();
+                return false;
+            } else {
+                mWorkingNote = WorkingNote.load(this, noteId);
+                if (mWorkingNote == null) {
+                    Log.e(TAG, "load note failed with note id" + noteId);
+                    finish();
+                    return false;
+                }
+            }
+            getWindow().setSoftInputMode(
+                    WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN
+                            | WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);
+        } else if(TextUtils.equals(Intent.ACTION_INSERT_OR_EDIT, intent.getAction())) {
+            // New note
+            long folderId = intent.getLongExtra(Notes.INTENT_EXTRA_FOLDER_ID, 0);
+            int widgetId = intent.getIntExtra(Notes.INTENT_EXTRA_WIDGET_ID,
+                    AppWidgetManager.INVALID_APPWIDGET_ID);
+            int widgetType = intent.getIntExtra(Notes.INTENT_EXTRA_WIDGET_TYPE,
+                    Notes.TYPE_WIDGET_INVALIDE);
+            int bgResId = intent.getIntExtra(Notes.INTENT_EXTRA_BACKGROUND_ID,
+                    ResourceParser.getDefaultBgId(this));
+
+            // Parse call-record note
+            String phoneNumber = intent.getStringExtra(Intent.EXTRA_PHONE_NUMBER);
+            long callDate = intent.getLongExtra(Notes.INTENT_EXTRA_CALL_DATE, 0);
+            if (callDate != 0 && phoneNumber != null) {
+                if (TextUtils.isEmpty(phoneNumber)) {
+                    Log.w(TAG, "The call record number is null");
+                }
+                long noteId = 0;
+                if ((noteId = DataUtils.getNoteIdByPhoneNumberAndCallDate(getContentResolver(),
+                        phoneNumber, callDate)) > 0) {
+                    mWorkingNote = WorkingNote.load(this, noteId);
+                    if (mWorkingNote == null) {
+                        Log.e(TAG, "load call note failed with note id" + noteId);
+                        finish();
+                        return false;
+                    }
+                } else {
+                    mWorkingNote = WorkingNote.createEmptyNote(this, folderId, widgetId,
+                            widgetType, bgResId);
+                    mWorkingNote.convertToCallNote(phoneNumber, callDate);
+                }
+            } else {
+                mWorkingNote = WorkingNote.createEmptyNote(this, folderId, widgetId, widgetType,
+                        bgResId);
+            }
+
+            getWindow().setSoftInputMode(
+                    WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE
+                            | WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE);
+        } else {
+            Log.e(TAG, "Intent not specified action, should not support");
+            finish();
+            return false;
+        }
+        mWorkingNote.setOnSettingStatusChangedListener(this);
+        return true;
+    }
+
+    @Override
+    protected void onResume() {
+        super.onResume();
+        initNoteScreen();
+    }
+
+    private void initNoteScreen() {
+        mNoteEditor.setTextAppearance(this, TextAppearanceResources
+                .getTexAppearanceResource(mFontSizeId));
+        if (mWorkingNote.getCheckListMode() == TextNote.MODE_CHECK_LIST) {
+            switchToListMode(mWorkingNote.getContent());
+        } else {
+            mNoteEditor.setText(getHighlightQueryResult(mWorkingNote.getContent(), mUserQuery));
+            mNoteEditor.setSelection(mNoteEditor.getText().length());
+        }
+        for (Integer id : sBgSelectorSelectionMap.keySet()) {
+            findViewById(sBgSelectorSelectionMap.get(id)).setVisibility(View.GONE);
+        }
+        mHeadViewPanel.setBackgroundResource(mWorkingNote.getTitleBgResId());
+        mNoteEditorPanel.setBackgroundResource(mWorkingNote.getBgColorResId());
+
+        mNoteHeaderHolder.tvModified.setText(DateUtils.formatDateTime(this,
+                mWorkingNote.getModifiedDate(), DateUtils.FORMAT_SHOW_DATE
+                        | DateUtils.FORMAT_NUMERIC_DATE | DateUtils.FORMAT_SHOW_TIME
+                        | DateUtils.FORMAT_SHOW_YEAR));
+
+        /**
+         * TODO: Add the menu for setting alert. Currently disable it because the DateTimePicker
+         * is not ready
+         */
+        showAlertHeader();
+    }
+
+    private void showAlertHeader() {
+        if (mWorkingNote.hasClockAlert()) {
+            long time = System.currentTimeMillis();
+            if (time > mWorkingNote.getAlertDate()) {
+                mNoteHeaderHolder.tvAlertDate.setText(R.string.note_alert_expired);
+            } else {
+                mNoteHeaderHolder.tvAlertDate.setText(DateUtils.getRelativeTimeSpanString(
+                        mWorkingNote.getAlertDate(), time, DateUtils.MINUTE_IN_MILLIS));
+            }
+            mNoteHeaderHolder.tvAlertDate.setVisibility(View.VISIBLE);
+            mNoteHeaderHolder.ivAlertIcon.setVisibility(View.VISIBLE);
+        } else {
+            mNoteHeaderHolder.tvAlertDate.setVisibility(View.GONE);
+            mNoteHeaderHolder.ivAlertIcon.setVisibility(View.GONE);
+        };
+    }
+
+    @Override
+    protected void onNewIntent(Intent intent) {
+        super.onNewIntent(intent);
+        initActivityState(intent);
+    }
+
+    @Override
+    protected void onSaveInstanceState(Bundle outState) {
+        super.onSaveInstanceState(outState);
+        /**
+         * For new note without note id, we should firstly save it to
+         * generate a id. If the editing note is not worth saving, there
+         * is no id which is equivalent to create new note
+         */
+        if (!mWorkingNote.existInDatabase()) {
+            saveNote();
+        }
+        outState.putLong(Intent.EXTRA_UID, mWorkingNote.getNoteId());
+        Log.d(TAG, "Save working note id: " + mWorkingNote.getNoteId() + " onSaveInstanceState");
+    }
+
+    @Override
+    public boolean dispatchTouchEvent(MotionEvent ev) {
+        if (mNoteBgColorSelector.getVisibility() == View.VISIBLE
+                && !inRangeOfView(mNoteBgColorSelector, ev)) {
+            mNoteBgColorSelector.setVisibility(View.GONE);
+            return true;
+        }
+
+        if (mFontSizeSelector.getVisibility() == View.VISIBLE
+                && !inRangeOfView(mFontSizeSelector, ev)) {
+            mFontSizeSelector.setVisibility(View.GONE);
+            return true;
+        }
+        return super.dispatchTouchEvent(ev);
+    }
+
+    private boolean inRangeOfView(View view, MotionEvent ev) {
+        int []location = new int[2];
+        view.getLocationOnScreen(location);
+        int x = location[0];
+        int y = location[1];
+        if (ev.getX() < x
+                || ev.getX() > (x + view.getWidth())
+                || ev.getY() < y
+                || ev.getY() > (y + view.getHeight())) {
+                    return false;
+                }
+        return true;
+    }
+
+    private void initResources() {
+        mHeadViewPanel = findViewById(R.id.note_title);
+        mNoteHeaderHolder = new HeadViewHolder();
+        mNoteHeaderHolder.tvModified = (TextView) findViewById(R.id.tv_modified_date);
+        mNoteHeaderHolder.ivAlertIcon = (ImageView) findViewById(R.id.iv_alert_icon);
+        mNoteHeaderHolder.tvAlertDate = (TextView) findViewById(R.id.tv_alert_date);
+        mNoteHeaderHolder.ibSetBgColor = (ImageView) findViewById(R.id.btn_set_bg_color);
+        mNoteHeaderHolder.ibSetBgColor.setOnClickListener(this);
+        mNoteEditor = (EditText) findViewById(R.id.note_edit_view);
+        mNoteEditorPanel = findViewById(R.id.sv_note_edit);
+        mNoteBgColorSelector = findViewById(R.id.note_bg_color_selector);
+        for (int id : sBgSelectorBtnsMap.keySet()) {
+            ImageView iv = (ImageView) findViewById(id);
+            iv.setOnClickListener(this);
+        }
+
+        mFontSizeSelector = findViewById(R.id.font_size_selector);
+        for (int id : sFontSizeBtnsMap.keySet()) {
+            View view = findViewById(id);
+            view.setOnClickListener(this);
+        };
+        mSharedPrefs = PreferenceManager.getDefaultSharedPreferences(this);
+        mFontSizeId = mSharedPrefs.getInt(PREFERENCE_FONT_SIZE, ResourceParser.BG_DEFAULT_FONT_SIZE);
+        /**
+         * HACKME: Fix bug of store the resource id in shared preference.
+         * The id may larger than the length of resources, in this case,
+         * return the {@link ResourceParser#BG_DEFAULT_FONT_SIZE}
+         */
+        if(mFontSizeId >= TextAppearanceResources.getResourcesSize()) {
+            mFontSizeId = ResourceParser.BG_DEFAULT_FONT_SIZE;
+        }
+        mEditTextList = (LinearLayout) findViewById(R.id.note_edit_list);
+    }
+
+    @Override
+    protected void onPause() {
+        super.onPause();
+        if(saveNote()) {
+            Log.d(TAG, "Note data was saved with length:" + mWorkingNote.getContent().length());
+        }
+        clearSettingState();
+    }
+
+    private void updateWidget() {
+        Intent intent = new Intent(AppWidgetManager.ACTION_APPWIDGET_UPDATE);
+        if (mWorkingNote.getWidgetType() == Notes.TYPE_WIDGET_2X) {
+            intent.setClass(this, NoteWidgetProvider_2x.class);
+        } else if (mWorkingNote.getWidgetType() == Notes.TYPE_WIDGET_4X) {
+            intent.setClass(this, NoteWidgetProvider_4x.class);
+        } else {
+            Log.e(TAG, "Unspported widget type");
+            return;
+        }
+
+        intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, new int[] {
+            mWorkingNote.getWidgetId()
+        });
+
+        sendBroadcast(intent);
+        setResult(RESULT_OK, intent);
+    }
+
+    public void onClick(View v) {
+        int id = v.getId();
+        if (id == R.id.btn_set_bg_color) {
+            mNoteBgColorSelector.setVisibility(View.VISIBLE);
+            findViewById(sBgSelectorSelectionMap.get(mWorkingNote.getBgColorId())).setVisibility(
+                    -                    View.VISIBLE);
+        } else if (sBgSelectorBtnsMap.containsKey(id)) {
+            findViewById(sBgSelectorSelectionMap.get(mWorkingNote.getBgColorId())).setVisibility(
+                    View.GONE);
+            mWorkingNote.setBgColorId(sBgSelectorBtnsMap.get(id));
+            mNoteBgColorSelector.setVisibility(View.GONE);
+        } else if (sFontSizeBtnsMap.containsKey(id)) {
+            findViewById(sFontSelectorSelectionMap.get(mFontSizeId)).setVisibility(View.GONE);
+            mFontSizeId = sFontSizeBtnsMap.get(id);
+            mSharedPrefs.edit().putInt(PREFERENCE_FONT_SIZE, mFontSizeId).commit();
+            findViewById(sFontSelectorSelectionMap.get(mFontSizeId)).setVisibility(View.VISIBLE);
+            if (mWorkingNote.getCheckListMode() == TextNote.MODE_CHECK_LIST) {
+                getWorkingText();
+                switchToListMode(mWorkingNote.getContent());
+            } else {
+                mNoteEditor.setTextAppearance(this,
+                        TextAppearanceResources.getTexAppearanceResource(mFontSizeId));
+            }
+            mFontSizeSelector.setVisibility(View.GONE);
+        }
+    }
+
+    @Override
+    public void onBackPressed() {
+        if(clearSettingState()) {
+            return;
+        }
+
+        saveNote();
+        super.onBackPressed();
+    }
+
+    private boolean clearSettingState() {
+        if (mNoteBgColorSelector.getVisibility() == View.VISIBLE) {
+            mNoteBgColorSelector.setVisibility(View.GONE);
+            return true;
+        } else if (mFontSizeSelector.getVisibility() == View.VISIBLE) {
+            mFontSizeSelector.setVisibility(View.GONE);
+            return true;
+        }
+        return false;
+    }
+
+    public void onBackgroundColorChanged() {
+        findViewById(sBgSelectorSelectionMap.get(mWorkingNote.getBgColorId())).setVisibility(
+                View.VISIBLE);
+        mNoteEditorPanel.setBackgroundResource(mWorkingNote.getBgColorResId());
+        mHeadViewPanel.setBackgroundResource(mWorkingNote.getTitleBgResId());
+    }
+
+    @Override
+    public boolean onPrepareOptionsMenu(Menu menu) {
+        if (isFinishing()) {
+            return true;
+        }
+        clearSettingState();
+        menu.clear();
+        if (mWorkingNote.getFolderId() == Notes.ID_CALL_RECORD_FOLDER) {
+            getMenuInflater().inflate(R.menu.call_note_edit, menu);
+        } else {
+            getMenuInflater().inflate(R.menu.note_edit, menu);
+        }
+        if (mWorkingNote.getCheckListMode() == TextNote.MODE_CHECK_LIST) {
+            menu.findItem(R.id.menu_list_mode).setTitle(R.string.menu_normal_mode);
+        } else {
+            menu.findItem(R.id.menu_list_mode).setTitle(R.string.menu_list_mode);
+        }
+        if (mWorkingNote.hasClockAlert()) {
+            menu.findItem(R.id.menu_alert).setVisible(false);
+        } else {
+            menu.findItem(R.id.menu_delete_remind).setVisible(false);
+        }
+        return true;
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        switch (item.getItemId()) {
+            case R.id.menu_new_note:
+                createNewNote();
+                break;
+            case R.id.menu_delete:
+                AlertDialog.Builder builder = new AlertDialog.Builder(this);
+                builder.setTitle(getString(R.string.alert_title_delete));
+                builder.setIcon(android.R.drawable.ic_dialog_alert);
+                builder.setMessage(getString(R.string.alert_message_delete_note));
+                builder.setPositiveButton(android.R.string.ok,
+                        new DialogInterface.OnClickListener() {
+                            public void onClick(DialogInterface dialog, int which) {
+                                deleteCurrentNote();
+                                finish();
+                            }
+                        });
+                builder.setNegativeButton(android.R.string.cancel, null);
+                builder.show();
+                break;
+            case R.id.menu_font_size:
+                mFontSizeSelector.setVisibility(View.VISIBLE);
+                findViewById(sFontSelectorSelectionMap.get(mFontSizeId)).setVisibility(View.VISIBLE);
+                break;
+            case R.id.menu_list_mode:
+                mWorkingNote.setCheckListMode(mWorkingNote.getCheckListMode() == 0 ?
+                        TextNote.MODE_CHECK_LIST : 0);
+                break;
+            case R.id.menu_share:
+                getWorkingText();
+                sendTo(this, mWorkingNote.getContent());
+                break;
+            case R.id.menu_send_to_desktop:
+                sendToDesktop();
+                break;
+            case R.id.menu_alert:
+                setReminder();
+                break;
+            case R.id.menu_delete_remind:
+                mWorkingNote.setAlertDate(0, false);
+                break;
+            default:
+                break;
+        }
+        return true;
+    }
+
+    private void setReminder() {
+        DateTimePickerDialog d = new DateTimePickerDialog(this, System.currentTimeMillis());
+        d.setOnDateTimeSetListener(new OnDateTimeSetListener() {
+            public void OnDateTimeSet(AlertDialog dialog, long date) {
+                mWorkingNote.setAlertDate(date	, true);
+            }
+        });
+        d.show();
+    }
+
+    /**
+     * Share note to apps that support {@link Intent#ACTION_SEND} action
+     * and {@text/plain} type
+     */
+    private void sendTo(Context context, String info) {
+        Intent intent = new Intent(Intent.ACTION_SEND);
+        intent.putExtra(Intent.EXTRA_TEXT, info);
+        intent.setType("text/plain");
+        context.startActivity(intent);
+    }
+
+    private void createNewNote() {
+        // Firstly, save current editing notes
+        saveNote();
+
+        // For safety, start a new NoteEditActivity
+        finish();
+        Intent intent = new Intent(this, NoteEditActivity.class);
+        intent.setAction(Intent.ACTION_INSERT_OR_EDIT);
+        intent.putExtra(Notes.INTENT_EXTRA_FOLDER_ID, mWorkingNote.getFolderId());
+        startActivity(intent);
+    }
+
+    private void deleteCurrentNote() {
+        if (mWorkingNote.existInDatabase()) {
+            HashSet<Long> ids = new HashSet<Long>();
+            long id = mWorkingNote.getNoteId();
+            if (id != Notes.ID_ROOT_FOLDER) {
+                ids.add(id);
+            } else {
+                Log.d(TAG, "Wrong note id, should not happen");
+            }
+            if (!isSyncMode()) {
+                if (!DataUtils.batchDeleteNotes(getContentResolver(), ids)) {
+                    Log.e(TAG, "Delete Note error");
+                }
+            } else {
+                if (!DataUtils.batchMoveToFolder(getContentResolver(), ids, Notes.ID_TRASH_FOLER)) {
+                    Log.e(TAG, "Move notes to trash folder error, should not happens");
+                }
+            }
+        }
+        mWorkingNote.markDeleted(true);
+    }
+
+    private boolean isSyncMode() {
+        return NotesPreferenceActivity.getSyncAccountName(this).trim().length() > 0;
+    }
+
+    public void onClockAlertChanged(long date, boolean set) {
+        /**
+         * User could set clock to an unsaved note, so before setting the
+         * alert clock, we should save the note first
+         */
+        if (!mWorkingNote.existInDatabase()) {
+            saveNote();
+        }
+        if (mWorkingNote.getNoteId() > 0) {
+            Intent intent = new Intent(this, AlarmReceiver.class);
+            intent.setData(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, mWorkingNote.getNoteId()));
+            PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent, 0);
+            AlarmManager alarmManager = ((AlarmManager) getSystemService(ALARM_SERVICE));
+            showAlertHeader();
+            if(!set) {
+                alarmManager.cancel(pendingIntent);
+            } else {
+                alarmManager.set(AlarmManager.RTC_WAKEUP, date, pendingIntent);
+            }
+        } else {
+            /**
+             * There is the condition that user has input nothing (the note is
+             * not worthy saving), we have no note id, remind the user that he
+             * should input something
+             */
+            Log.e(TAG, "Clock alert setting error");
+            showToast(R.string.error_note_empty_for_clock);
+        }
+    }
+
+    public void onWidgetChanged() {
+        updateWidget();
+    }
+
+    public void onEditTextDelete(int index, String text) {
+        int childCount = mEditTextList.getChildCount();
+        if (childCount == 1) {
+            return;
+        }
+
+        for (int i = index + 1; i < childCount; i++) {
+            ((NoteEditText) mEditTextList.getChildAt(i).findViewById(R.id.et_edit_text))
+                    .setIndex(i - 1);
+        }
+
+        mEditTextList.removeViewAt(index);
+        NoteEditText edit = null;
+        if(index == 0) {
+            edit = (NoteEditText) mEditTextList.getChildAt(0).findViewById(
+                    R.id.et_edit_text);
+        } else {
+            edit = (NoteEditText) mEditTextList.getChildAt(index - 1).findViewById(
+                    R.id.et_edit_text);
+        }
+        int length = edit.length();
+        edit.append(text);
+        edit.requestFocus();
+        edit.setSelection(length);
+    }
+
+    public void onEditTextEnter(int index, String text) {
+        /**
+         * Should not happen, check for debug
+         */
+        if(index > mEditTextList.getChildCount()) {
+            Log.e(TAG, "Index out of mEditTextList boundrary, should not happen");
+        }
+
+        View view = getListItem(text, index);
+        mEditTextList.addView(view, index);
+        NoteEditText edit = (NoteEditText) view.findViewById(R.id.et_edit_text);
+        edit.requestFocus();
+        edit.setSelection(0);
+        for (int i = index + 1; i < mEditTextList.getChildCount(); i++) {
+            ((NoteEditText) mEditTextList.getChildAt(i).findViewById(R.id.et_edit_text))
+                    .setIndex(i);
+        }
+    }
+
+    private void switchToListMode(String text) {
+        mEditTextList.removeAllViews();
+        String[] items = text.split("\n");
+        int index = 0;
+        for (String item : items) {
+            if(!TextUtils.isEmpty(item)) {
+                mEditTextList.addView(getListItem(item, index));
+                index++;
+            }
+        }
+        mEditTextList.addView(getListItem("", index));
+        mEditTextList.getChildAt(index).findViewById(R.id.et_edit_text).requestFocus();
+
+        mNoteEditor.setVisibility(View.GONE);
+        mEditTextList.setVisibility(View.VISIBLE);
+    }
+
+    private Spannable getHighlightQueryResult(String fullText, String userQuery) {
+        SpannableString spannable = new SpannableString(fullText == null ? "" : fullText);
+        if (!TextUtils.isEmpty(userQuery)) {
+            mPattern = Pattern.compile(userQuery);
+            Matcher m = mPattern.matcher(fullText);
+            int start = 0;
+            while (m.find(start)) {
+                spannable.setSpan(
+                        new BackgroundColorSpan(this.getResources().getColor(
+                                R.color.user_query_highlight)), m.start(), m.end(),
+                        Spannable.SPAN_INCLUSIVE_EXCLUSIVE);
+                start = m.end();
+            }
+        }
+        return spannable;
+    }
+
+    private View getListItem(String item, int index) {
+        View view = LayoutInflater.from(this).inflate(R.layout.note_edit_list_item, null);
+        final NoteEditText edit = (NoteEditText) view.findViewById(R.id.et_edit_text);
+        edit.setTextAppearance(this, TextAppearanceResources.getTexAppearanceResource(mFontSizeId));
+        CheckBox cb = ((CheckBox) view.findViewById(R.id.cb_edit_item));
+        cb.setOnCheckedChangeListener(new OnCheckedChangeListener() {
+            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
+                if (isChecked) {
+                    edit.setPaintFlags(edit.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG);
+                } else {
+                    edit.setPaintFlags(Paint.ANTI_ALIAS_FLAG | Paint.DEV_KERN_TEXT_FLAG);
+                }
+            }
+        });
+
+        if (item.startsWith(TAG_CHECKED)) {
+            cb.setChecked(true);
+            edit.setPaintFlags(edit.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG);
+            item = item.substring(TAG_CHECKED.length(), item.length()).trim();
+        } else if (item.startsWith(TAG_UNCHECKED)) {
+            cb.setChecked(false);
+            edit.setPaintFlags(Paint.ANTI_ALIAS_FLAG | Paint.DEV_KERN_TEXT_FLAG);
+            item = item.substring(TAG_UNCHECKED.length(), item.length()).trim();
+        }
+
+        edit.setOnTextViewChangeListener(this);
+        edit.setIndex(index);
+        edit.setText(getHighlightQueryResult(item, mUserQuery));
+        return view;
+    }
+
+    public void onTextChange(int index, boolean hasText) {
+        if (index >= mEditTextList.getChildCount()) {
+            Log.e(TAG, "Wrong index, should not happen");
+            return;
+        }
+        if(hasText) {
+            mEditTextList.getChildAt(index).findViewById(R.id.cb_edit_item).setVisibility(View.VISIBLE);
+        } else {
+            mEditTextList.getChildAt(index).findViewById(R.id.cb_edit_item).setVisibility(View.GONE);
+        }
+    }
+
+    public void onCheckListModeChanged(int oldMode, int newMode) {
+        if (newMode == TextNote.MODE_CHECK_LIST) {
+            switchToListMode(mNoteEditor.getText().toString());
+        } else {
+            if (!getWorkingText()) {
+                mWorkingNote.setWorkingText(mWorkingNote.getContent().replace(TAG_UNCHECKED + " ",
+                        ""));
+            }
+            mNoteEditor.setText(getHighlightQueryResult(mWorkingNote.getContent(), mUserQuery));
+            mEditTextList.setVisibility(View.GONE);
+            mNoteEditor.setVisibility(View.VISIBLE);
+        }
+    }
+
+    private boolean getWorkingText() {
+        boolean hasChecked = false;
+        if (mWorkingNote.getCheckListMode() == TextNote.MODE_CHECK_LIST) {
+            StringBuilder sb = new StringBuilder();
+            for (int i = 0; i < mEditTextList.getChildCount(); i++) {
+                View view = mEditTextList.getChildAt(i);
+                NoteEditText edit = (NoteEditText) view.findViewById(R.id.et_edit_text);
+                if (!TextUtils.isEmpty(edit.getText())) {
+                    if (((CheckBox) view.findViewById(R.id.cb_edit_item)).isChecked()) {
+                        sb.append(TAG_CHECKED).append(" ").append(edit.getText()).append("\n");
+                        hasChecked = true;
+                    } else {
+                        sb.append(TAG_UNCHECKED).append(" ").append(edit.getText()).append("\n");
+                    }
+                }
+            }
+            mWorkingNote.setWorkingText(sb.toString());
+        } else {
+            mWorkingNote.setWorkingText(mNoteEditor.getText().toString());
+        }
+        return hasChecked;
+    }
+
+    private boolean saveNote() {
+        getWorkingText();
+        boolean saved = mWorkingNote.saveNote();
+        if (saved) {
+            /**
+             * There are two modes from List view to edit view, open one note,
+             * create/edit a node. Opening node requires to the original
+             * position in the list when back from edit view, while creating a
+             * new node requires to the top of the list. This code
+             * {@link #RESULT_OK} is used to identify the create/edit state
+             */
+            setResult(RESULT_OK);
+        }
+        return saved;
+    }
+
+    private void sendToDesktop() {
+        /**
+         * Before send message to home, we should make sure that current
+         * editing note is exists in databases. So, for new note, firstly
+         * save it
+         */
+        if (!mWorkingNote.existInDatabase()) {
+            saveNote();
+        }
+
+        if (mWorkingNote.getNoteId() > 0) {
+            Intent sender = new Intent();
+            Intent shortcutIntent = new Intent(this, NoteEditActivity.class);
+            shortcutIntent.setAction(Intent.ACTION_VIEW);
+            shortcutIntent.putExtra(Intent.EXTRA_UID, mWorkingNote.getNoteId());
+            sender.putExtra(Intent.EXTRA_SHORTCUT_INTENT, shortcutIntent);
+            sender.putExtra(Intent.EXTRA_SHORTCUT_NAME,
+                    makeShortcutIconTitle(mWorkingNote.getContent()));
+            sender.putExtra(Intent.EXTRA_SHORTCUT_ICON_RESOURCE,
+                    Intent.ShortcutIconResource.fromContext(this, R.drawable.icon_app));
+            sender.putExtra("duplicate", true);
+            sender.setAction("com.android.launcher.action.INSTALL_SHORTCUT");
+            showToast(R.string.info_note_enter_desktop);
+            sendBroadcast(sender);
+        } else {
+            /**
+             * There is the condition that user has input nothing (the note is
+             * not worthy saving), we have no note id, remind the user that he
+             * should input something
+             */
+            Log.e(TAG, "Send to desktop error");
+            showToast(R.string.error_note_empty_for_send_to_desktop);
+        }
+    }
+
+    private String makeShortcutIconTitle(String content) {
+        content = content.replace(TAG_CHECKED, "");
+        content = content.replace(TAG_UNCHECKED, "");
+        return content.length() > SHORTCUT_ICON_TITLE_MAX_LEN ? content.substring(0,
+                SHORTCUT_ICON_TITLE_MAX_LEN) : content;
+    }
+
+    private void showToast(int resId) {
+        showToast(resId, Toast.LENGTH_SHORT);
+    }
+
+    private void showToast(int resId, int duration) {
+        Toast.makeText(this, resId, duration).show();
+    }
+}

src/net/micode/notes/ui/NoteEditText-note.java

@@ -0,0 +1,214 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui; // 定义包名
+
+import android.content.Context; // 导入Context类
+import android.graphics.Rect; // 导入Rect类
+import android.text.Layout; // 导入Layout类
+import android.text.Selection; // 导入Selection类
+import android.text.Spanned; // 导入Spanned接口
+import android.text.TextUtils; // 导入TextUtils类
+import android.text.style.URLSpan; // 导入URLSpan类
+import android.util.AttributeSet; // 导入AttributeSet类
+import android.util.Log; // 导入Log类
+import android.view.ContextMenu; // 导入ContextMenu类
+import android.view.KeyEvent; // 导入KeyEvent类
+import android.view.MenuItem; // 导入MenuItem类
+import android.view.MenuItem.OnMenuItemClickListener; // 导入菜单项点击监听器接口
+import android.view.MotionEvent; // 导入MotionEvent类
+import android.widget.EditText; // 导入EditText类
+
+import net.micode.notes.R; // 导入资源类
+
+import java.util.HashMap; // 导入HashMap类
+import java.util.Map; // 导入Map接口
+
+public class NoteEditText extends EditText { // 定义NoteEditText类，继承自EditText
+    private static final String TAG = "NoteEditText"; // 日志TAG
+    private int mIndex; // 当前索引
+    private int mSelectionStartBeforeDelete; // 删除前的选择起始位置
+
+    private static final String SCHEME_TEL = "tel:"; // 电话链接前缀
+    private static final String SCHEME_HTTP = "http:"; // HTTP链接前缀
+    private static final String SCHEME_EMAIL = "mailto:"; // 邮件链接前缀
+
+    private static final Map<String, Integer> sSchemaActionResMap = new HashMap<String, Integer>(); // 链接方案动作资源映射
+    static { // 静态初始化块
+        sSchemaActionResMap.put(SCHEME_TEL, R.string.note_link_tel); // 电话链接
+        sSchemaActionResMap.put(SCHEME_HTTP, R.string.note_link_web); // HTTP链接
+        sSchemaActionResMap.put(SCHEME_EMAIL, R.string.note_link_email); // 邮件链接
+    }
+
+    /**
+     * 被{@link NoteEditActivity}调用以删除或添加编辑文本
+     */
+    public interface OnTextViewChangeListener { // 文本视图变化监听器接口
+        /**
+         * 当{@link KeyEvent#KEYCODE_DEL}发生且文本为空时删除当前编辑文本
+         */
+        void onEditTextDelete(int index, String text); // 删除事件
+
+        /**
+         * 当{@link KeyEvent#KEYCODE_ENTER}发生时，在当前编辑文本后添加编辑文本
+         */
+        void onEditTextEnter(int index, String text); // 添加事件
+
+        /**
+         * 文本变化时隐藏或显示项选项
+         */
+        void onTextChange(int index, boolean hasText); // 文本变化事件
+    }
+
+    private OnTextViewChangeListener mOnTextViewChangeListener; // 文本视图变化监听器
+
+    public NoteEditText(Context context) { // 构造函数
+        super(context, null); // 调用父类构造函数
+        mIndex = 0; // 初始化索引为0
+    }
+
+    public void setIndex(int index) { // 设置索引
+        mIndex = index; // 更新索引
+    }
+
+    public void setOnTextViewChangeListener(OnTextViewChangeListener listener) { // 设置文本视图变化监听器
+        mOnTextViewChangeListener = listener; // 更新监听器
+    }
+
+    public NoteEditText(Context context, AttributeSet attrs) { // 带属性的构造函数
+        super(context, attrs, android.R.attr.editTextStyle); // 调用父类构造函数
+    }
+
+    public NoteEditText(Context context, AttributeSet attrs, int defStyle) { // 带属性和样式的构造函数
+        super(context, attrs, defStyle); // 调用父类构造函数
+        // TODO Auto-generated constructor stub
+    }
+
+    @Override
+    public boolean onTouchEvent(MotionEvent event) { // 触摸事件处理
+        switch (event.getAction()) { // 处理触摸事件的不同动作
+            case MotionEvent.ACTION_DOWN: // 按下动作
+                int x = (int) event.getX(); // 获取触摸点的x坐标
+                int y = (int) event.getY(); // 获取触摸点的y坐标
+                x -= getTotalPaddingLeft(); // 减去左侧填充
+                y -= getTotalPaddingTop(); // 减去顶部填充
+                x += getScrollX(); // 添加水平滚动值
+                y += getScrollY(); // 添加垂直滚动值
+
+                Layout layout = getLayout(); // 获取布局
+                int line = layout.getLineForVertical(y); // 获取y坐标对应的行号
+                int off = layout.getOffsetForHorizontal(line, x); // 获取x坐标对应的偏移
+                Selection.setSelection(getText(), off); // 设置文本选择
+                break;
+        }
+
+        return super.onTouchEvent(event); // 调用父类的触摸事件处理
+    }
+
+    @Override
+    public boolean onKeyDown(int keyCode, KeyEvent event) { // 按键按下处理
+        switch (keyCode) { // 根据按键代码进行处理
+            case KeyEvent.KEYCODE_ENTER: // 回车键
+                if (mOnTextViewChangeListener != null) { // 如果设置了监听器
+                    return false; // 不处理
+                }
+                break;
+            case KeyEvent.KEYCODE_DEL: // 删除键
+                mSelectionStartBeforeDelete = getSelectionStart(); // 保存删除前的选择起始位置
+                break;
+            default:
+                break;
+        }
+        return super.onKeyDown(keyCode, event); // 调用父类的按键处理
+    }
+
+    @Override
+    public boolean onKeyUp(int keyCode, KeyEvent event) { // 按键松开处理
+        switch(keyCode) { // 根据按键代码进行处理
+            case KeyEvent.KEYCODE_DEL: // 删除键
+                if (mOnTextViewChangeListener != null) { // 如果设置了监听器
+                    if (0 == mSelectionStartBeforeDelete && mIndex != 0) { // 如果删除前选择位置为0且当前索引不为0
+                        mOnTextViewChangeListener.onEditTextDelete(mIndex, getText().toString()); // 通知删除
+                        return true; // 返回true，表示事件已处理
+                    }
+                } else {
+                    Log.d(TAG, "OnTextViewChangeListener was not seted"); // 日志输出
+                }
+                break;
+            case KeyEvent.KEYCODE_ENTER: // 回车键
+                if (mOnTextViewChangeListener != null) { // 如果设置了监听器
+                    int selectionStart = getSelectionStart(); // 获取当前选择位置
+                    String text = getText().subSequence(selectionStart, length()).toString(); // 获取当前输入文本
+                    setText(getText().subSequence(0, selectionStart)); // 更新文本，去掉输入的部分
+                    mOnTextViewChangeListener.onEditTextEnter(mIndex + 1, text); // 通知输入
+                } else {
+                    Log.d(TAG, "OnTextViewChangeListener was not seted"); // 日志输出
+                }
+                break;
+            default:
+                break;
+        }
+        return super.onKeyUp(keyCode, event); // 调用父类的按键处理
+    }
+
+    @Override
+    protected void onFocusChanged(boolean focused, int direction, Rect previouslyFocusedRect) { // 焦点变化时调用
+        if (mOnTextViewChangeListener != null) { // 如果设置了监听器
+            if (!focused && TextUtils.isEmpty(getText())) { // 如果失去焦点且文本为空
+                mOnTextViewChangeListener.onTextChange(mIndex, false); // 通知文本变化为无文本
+            } else {
+                mOnTextViewChangeListener.onTextChange(mIndex, true); // 通知文本变化为有文本
+            }
+        }
+        super.onFocusChanged(focused, direction, previouslyFocusedRect); // 调用父类的焦点变化处理
+    }
+
+    @Override
+    protected void onCreateContextMenu(ContextMenu menu) { // 创建上下文菜单
+        if (getText() instanceof Spanned) { // 如果文本是Spanned类型
+            int selStart = getSelectionStart(); // 获取选择起始位置
+            int selEnd = getSelectionEnd(); // 获取选择结束位置
+
+            int min = Math.min(selStart, selEnd); // 选择的最小位置
+            int max = Math.max(selStart, selEnd); // 选择的最大位置
+
+            final URLSpan[] urls = ((Spanned) getText()).getSpans(min, max, URLSpan.class); // 获取选中的URLSpan
+            if (urls.length == 1) { // 如果选中的URLSpan只有一个
+                int defaultResId = 0; // 初始化默认资源ID
+                for (String schema : sSchemaActionResMap.keySet()) { // 遍历链接方案映射
+                    if (urls[0].getURL().indexOf(schema) >= 0) { // 检查URL是否包含方案
+                        defaultResId = sSchemaActionResMap.get(schema); // 获取对应的资源ID
+                        break; // 跳出循环
+                    }
+                }
+
+                if (defaultResId == 0) { // 如果没有匹配的方案
+                    defaultResId = R.string.note_link_other; // 设置为其他链接
+                }
+
+                menu.add(0, 0, 0, defaultResId).setOnMenuItemClickListener( // 添加菜单项
+                        new OnMenuItemClickListener() {
+                            public boolean onMenuItemClick(MenuItem item) { // 菜单项点击事件
+                                // 触发网址点击的意图
+                                urls[0].onClick(NoteEditText.this); // 当点击URL时，调用其onClick方法
+                                return true; // 返回true，表示事件已处理
+                            }
+                        });
+            }
+        }
+        super.onCreateContextMenu(menu); // 调用父类的上下文菜单创建处理
+    }
+}

src/net/micode/notes/ui/NoteEditText.java

@@ -0,0 +1,217 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui;
+
+import android.content.Context;
+import android.graphics.Rect;
+import android.text.Layout;
+import android.text.Selection;
+import android.text.Spanned;
+import android.text.TextUtils;
+import android.text.style.URLSpan;
+import android.util.AttributeSet;
+import android.util.Log;
+import android.view.ContextMenu;
+import android.view.KeyEvent;
+import android.view.MenuItem;
+import android.view.MenuItem.OnMenuItemClickListener;
+import android.view.MotionEvent;
+import android.widget.EditText;
+
+import net.micode.notes.R;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class NoteEditText extends EditText {
+    private static final String TAG = "NoteEditText";
+    private int mIndex;
+    private int mSelectionStartBeforeDelete;
+
+    private static final String SCHEME_TEL = "tel:" ;
+    private static final String SCHEME_HTTP = "http:" ;
+    private static final String SCHEME_EMAIL = "mailto:" ;
+
+    private static final Map<String, Integer> sSchemaActionResMap = new HashMap<String, Integer>();
+    static {
+        sSchemaActionResMap.put(SCHEME_TEL, R.string.note_link_tel);
+        sSchemaActionResMap.put(SCHEME_HTTP, R.string.note_link_web);
+        sSchemaActionResMap.put(SCHEME_EMAIL, R.string.note_link_email);
+    }
+
+    /**
+     * Call by the {@link NoteEditActivity} to delete or add edit text
+     */
+    public interface OnTextViewChangeListener {
+        /**
+         * Delete current edit text when {@link KeyEvent#KEYCODE_DEL} happens
+         * and the text is null
+         */
+        void onEditTextDelete(int index, String text);
+
+        /**
+         * Add edit text after current edit text when {@link KeyEvent#KEYCODE_ENTER}
+         * happen
+         */
+        void onEditTextEnter(int index, String text);
+
+        /**
+         * Hide or show item option when text change
+         */
+        void onTextChange(int index, boolean hasText);
+    }
+
+    private OnTextViewChangeListener mOnTextViewChangeListener;
+
+    public NoteEditText(Context context) {
+        super(context, null);
+        mIndex = 0;
+    }
+
+    public void setIndex(int index) {
+        mIndex = index;
+    }
+
+    public void setOnTextViewChangeListener(OnTextViewChangeListener listener) {
+        mOnTextViewChangeListener = listener;
+    }
+
+    public NoteEditText(Context context, AttributeSet attrs) {
+        super(context, attrs, android.R.attr.editTextStyle);
+    }
+
+    public NoteEditText(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+        // TODO Auto-generated constructor stub
+    }
+
+    @Override
+    public boolean onTouchEvent(MotionEvent event) {
+        switch (event.getAction()) {
+            case MotionEvent.ACTION_DOWN:
+
+                int x = (int) event.getX();
+                int y = (int) event.getY();
+                x -= getTotalPaddingLeft();
+                y -= getTotalPaddingTop();
+                x += getScrollX();
+                y += getScrollY();
+
+                Layout layout = getLayout();
+                int line = layout.getLineForVertical(y);
+                int off = layout.getOffsetForHorizontal(line, x);
+                Selection.setSelection(getText(), off);
+                break;
+        }
+
+        return super.onTouchEvent(event);
+    }
+
+    @Override
+    public boolean onKeyDown(int keyCode, KeyEvent event) {
+        switch (keyCode) {
+            case KeyEvent.KEYCODE_ENTER:
+                if (mOnTextViewChangeListener != null) {
+                    return false;
+                }
+                break;
+            case KeyEvent.KEYCODE_DEL:
+                mSelectionStartBeforeDelete = getSelectionStart();
+                break;
+            default:
+                break;
+        }
+        return super.onKeyDown(keyCode, event);
+    }
+
+    @Override
+    public boolean onKeyUp(int keyCode, KeyEvent event) {
+        switch(keyCode) {
+            case KeyEvent.KEYCODE_DEL:
+                if (mOnTextViewChangeListener != null) {
+                    if (0 == mSelectionStartBeforeDelete && mIndex != 0) {
+                        mOnTextViewChangeListener.onEditTextDelete(mIndex, getText().toString());
+                        return true;
+                    }
+                } else {
+                    Log.d(TAG, "OnTextViewChangeListener was not seted");
+                }
+                break;
+            case KeyEvent.KEYCODE_ENTER:
+                if (mOnTextViewChangeListener != null) {
+                    int selectionStart = getSelectionStart();
+                    String text = getText().subSequence(selectionStart, length()).toString();
+                    setText(getText().subSequence(0, selectionStart));
+                    mOnTextViewChangeListener.onEditTextEnter(mIndex + 1, text);
+                } else {
+                    Log.d(TAG, "OnTextViewChangeListener was not seted");
+                }
+                break;
+            default:
+                break;
+        }
+        return super.onKeyUp(keyCode, event);
+    }
+
+    @Override
+    protected void onFocusChanged(boolean focused, int direction, Rect previouslyFocusedRect) {
+        if (mOnTextViewChangeListener != null) {
+            if (!focused && TextUtils.isEmpty(getText())) {
+                mOnTextViewChangeListener.onTextChange(mIndex, false);
+            } else {
+                mOnTextViewChangeListener.onTextChange(mIndex, true);
+            }
+        }
+        super.onFocusChanged(focused, direction, previouslyFocusedRect);
+    }
+
+    @Override
+    protected void onCreateContextMenu(ContextMenu menu) {
+        if (getText() instanceof Spanned) {
+            int selStart = getSelectionStart();
+            int selEnd = getSelectionEnd();
+
+            int min = Math.min(selStart, selEnd);
+            int max = Math.max(selStart, selEnd);
+
+            final URLSpan[] urls = ((Spanned) getText()).getSpans(min, max, URLSpan.class);
+            if (urls.length == 1) {
+                int defaultResId = 0;
+                for(String schema: sSchemaActionResMap.keySet()) {
+                    if(urls[0].getURL().indexOf(schema) >= 0) {
+                        defaultResId = sSchemaActionResMap.get(schema);
+                        break;
+                    }
+                }
+
+                if (defaultResId == 0) {
+                    defaultResId = R.string.note_link_other;
+                }
+
+                menu.add(0, 0, 0, defaultResId).setOnMenuItemClickListener(
+                        new OnMenuItemClickListener() {
+                            public boolean onMenuItemClick(MenuItem item) {
+                                // goto a new intent
+                                urls[0].onClick(NoteEditText.this);
+                                return true;
+                            }
+                        });
+            }
+        }
+        super.onCreateContextMenu(menu);
+    }
+}

src/net/micode/notes/ui/NoteItemData-note.java

@@ -0,0 +1,226 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui; // 定义包名
+
+import android.content.Context; // 导入Context类
+import android.database.Cursor; // 导入Cursor类
+import android.text.TextUtils; // 导入TextUtils类
+
+import net.micode.notes.data.Contact; // 导入Contact类
+import net.micode.notes.data.Notes; // 导入Notes类
+import net.micode.notes.data.Notes.NoteColumns; // 导入Notes列类
+import net.micode.notes.tool.DataUtils; // 导入数据工具类
+
+public class NoteItemData { // 定义笔记项数据类
+    static final String [] PROJECTION = new String [] { // 定义要查询的列数组
+        NoteColumns.ID, // 笔记ID列
+        NoteColumns.ALERTED_DATE, // 警报日期列
+        NoteColumns.BG_COLOR_ID, // 背景颜色ID列
+        NoteColumns.CREATED_DATE, // 创建日期列
+        NoteColumns.HAS_ATTACHMENT, // 是否有附件列
+        NoteColumns.MODIFIED_DATE, // 修改日期列
+        NoteColumns.NOTES_COUNT, // 笔记数量列
+        NoteColumns.PARENT_ID, // 父级ID列
+        NoteColumns.SNIPPET, // 摘要列
+        NoteColumns.TYPE, // 类型列
+        NoteColumns.WIDGET_ID, // 小部件ID列
+        NoteColumns.WIDGET_TYPE, // 小部件类型列
+    };
+
+    private static final int ID_COLUMN                    = 0; // ID列索引
+    private static final int ALERTED_DATE_COLUMN          = 1; // 警报日期列索引
+    private static final int BG_COLOR_ID_COLUMN           = 2; // 背景颜色ID列索引
+    private static final int CREATED_DATE_COLUMN          = 3; // 创建日期列索引
+    private static final int HAS_ATTACHMENT_COLUMN        = 4; // 附件列索引
+    private static final int MODIFIED_DATE_COLUMN         = 5; // 修改日期列索引
+    private static final int NOTES_COUNT_COLUMN           = 6; // 笔记数量列索引
+    private static final int PARENT_ID_COLUMN             = 7; // 父级ID列索引
+    private static final int SNIPPET_COLUMN               = 8; // 摘要列索引
+    private static final int TYPE_COLUMN                  = 9; // 类型列索引
+    private static final int WIDGET_ID_COLUMN             = 10; // 小部件ID列索引
+    private static final int WIDGET_TYPE_COLUMN           = 11; // 小部件类型列索引
+
+    private long mId; // 笔记ID
+    private long mAlertDate; // 警报日期
+    private int mBgColorId; // 背景颜色ID
+    private long mCreatedDate; // 创建日期
+    private boolean mHasAttachment; // 是否有附件
+    private long mModifiedDate; // 修改日期
+    private int mNotesCount; // 笔记数量
+    private long mParentId; // 父级ID
+    private String mSnippet; // 摘要
+    private int mType; // 笔记类型
+    private int mWidgetId; // 小部件ID
+    private int mWidgetType; // 小部件类型
+    private String mName; // 联系人名称
+    private String mPhoneNumber; // 联系电话号码
+
+    // 用于记录该笔记在列表中的位置信息
+    private boolean mIsLastItem; // 是否为最后一项
+    private boolean mIsFirstItem; // 是否为第一项
+    private boolean mIsOnlyOneItem; // 是否为唯一一项
+    private boolean mIsOneNoteFollowingFolder; // 是否为文件夹下唯一笔记
+    private boolean mIsMultiNotesFollowingFolder; // 是否有多个笔记在文件夹下
+
+    // 构造函数，接收上下文和游标作为参数
+    public NoteItemData(Context context, Cursor cursor) {
+        mId = cursor.getLong(ID_COLUMN); // 从游标中获取笔记ID
+        mAlertDate = cursor.getLong(ALERTED_DATE_COLUMN); // 从游标中获取警报日期
+        mBgColorId = cursor.getInt(BG_COLOR_ID_COLUMN); // 从游标中获取背景颜色ID
+        mCreatedDate = cursor.getLong(CREATED_DATE_COLUMN); // 从游标中获取创建日期
+        mHasAttachment = (cursor.getInt(HAS_ATTACHMENT_COLUMN) > 0) ? true : false; // 根据游标中的信息判断是否有附件
+        mModifiedDate = cursor.getLong(MODIFIED_DATE_COLUMN); // 从游标中获取修改日期
+        mNotesCount = cursor.getInt(NOTES_COUNT_COLUMN); // 从游标中获取笔记数量
+        mParentId = cursor.getLong(PARENT_ID_COLUMN); // 从游标中获取父级ID
+        mSnippet = cursor.getString(SNIPPET_COLUMN); // 从游标中获取摘要
+        mSnippet = mSnippet.replace(NoteEditActivity.TAG_CHECKED, "").replace( // 清除已勾选标记
+                NoteEditActivity.TAG_UNCHECKED, "");
+        mType = cursor.getInt(TYPE_COLUMN); // 从游标中获取笔记类型
+        mWidgetId = cursor.getInt(WIDGET_ID_COLUMN); // 从游标中获取小部件ID
+        mWidgetType = cursor.getInt(WIDGET_TYPE_COLUMN); // 从游标中获取小部件类型
+
+        mPhoneNumber = ""; // 初始化联系电话为空
+        if (mParentId == Notes.ID_CALL_RECORD_FOLDER) { // 如果父级ID为通话记录文件夹
+            mPhoneNumber = DataUtils.getCallNumberByNoteId(context.getContentResolver(), mId); // 根据笔记ID获取通话记录电话号码
+            if (!TextUtils.isEmpty(mPhoneNumber)) { // 如果电话号码不为空
+                mName = Contact.getContact(context, mPhoneNumber); // 获取联系人的名称
+                if (mName == null) { // 如果没有联系人名称
+                    mName = mPhoneNumber; // 将名称设置为电话号码
+                }
+            }
+        }
+
+        if (mName == null) { // 如果名称还是为null
+            mName = ""; // 设置为空字符串
+        }
+        checkPostion(cursor); // 检查位置信息
+    }
+
+    private void checkPostion(Cursor cursor) { // 检查当前项目在游标中的位置信息
+        mIsLastItem = cursor.isLast(); // 判断是否为最后一项
+        mIsFirstItem = cursor.isFirst(); // 判断是否为第一项
+        mIsOnlyOneItem = (cursor.getCount() == 1); // 判断是否为唯一一项
+        mIsMultiNotesFollowingFolder = false; // 初始化为false
+        mIsOneNoteFollowingFolder = false; // 初始化为false
+
+        if (mType == Notes.TYPE_NOTE && !mIsFirstItem) { // 如果当前类型为笔记且不是第一项
+            int position = cursor.getPosition(); // 获取当前游标位置
+            if (cursor.moveToPrevious()) { // 移动游标到上一项
+                // 如果上一项是文件夹或系统类型
+                if (cursor.getInt(TYPE_COLUMN) == Notes.TYPE_FOLDER
+                        || cursor.getInt(TYPE_COLUMN) == Notes.TYPE_SYSTEM) {
+                    if (cursor.getCount() > (position + 1)) { // 如果游标数量大于当前位置加1
+                        mIsMultiNotesFollowingFolder = true; // 模式是多个笔记在文件夹下
+                    } else {
+                        mIsOneNoteFollowingFolder = true; // 模式是唯一笔记在文件夹下
+                    }
+                }
+                if (!cursor.moveToNext()) { // 移动回当前游标位置失败
+                    throw new IllegalStateException("cursor move to previous but can't move back"); // 抛出异常
+                }
+            }
+        }
+    }
+
+    public boolean isOneFollowingFolder() { // 判断是否为唯一笔记在文件夹下
+        return mIsOneNoteFollowingFolder; // 返回结果
+    }
+
+    public boolean isMultiFollowingFolder() { // 判断是否有多个笔记在文件夹下
+        return mIsMultiNotesFollowingFolder; // 返回结果
+    }
+
+    public boolean isLast() { // 判断是否为最后一项
+        return mIsLastItem; // 返回结果
+    }
+
+    public String getCallName() { // 获取通话记录联系人名称
+        return mName; // 返回联系人名称
+    }
+
+    public boolean isFirst() { // 判断是否为第一项
+        return mIsFirstItem; // 返回结果
+    }
+
+    public boolean isSingle() { // 判断是否为唯一一项
+        return mIsOnlyOneItem; // 返回结果
+    }
+
+    public long getId() { // 获取笔记ID
+        return mId; // 返回笔记ID
+    }
+
+    public long getAlertDate() { // 获取警报日期
+        return mAlertDate; // 返回警报日期
+    }
+
+    public long getCreatedDate() { // 获取创建日期
+        return mCreatedDate; // 返回创建日期
+    }
+
+    public boolean hasAttachment() { // 判断是否有附件
+        return mHasAttachment; // 返回结果
+    }
+
+    public long getModifiedDate() { // 获取修改日期
+        return mModifiedDate; // 返回修改日期
+    }
+
+    public int getBgColorId() { // 获取背景颜色ID
+        return mBgColorId; // 返回背景颜色ID
+    }
+
+    public long getParentId() { // 获取父级ID
+        return mParentId; // 返回父级ID
+    }
+
+    public int getNotesCount() { // 获取笔记数量
+        return mNotesCount; // 返回笔记数量
+    }
+
+    public long getFolderId () { // 获取文件夹ID
+        return mParentId; // 返回父级ID
+    }
+
+    public int getType() { // 获取笔记类型
+        return mType; // 返回笔记类型
+    }
+
+    public int getWidgetType() { // 获取小部件类型
+        return mWidgetType; // 返回小部件类型
+    }
+
+    public int getWidgetId() { // 获取小部件ID
+        return mWidgetId; // 返回小部件ID
+    }
+
+    public String getSnippet() { // 获取摘要
+        return mSnippet; // 返回摘要
+    }
+
+    public boolean hasAlert() { // 判断是否有警报
+        return (mAlertDate > 0); // 根据警报日期判断
+    }
+
+    public boolean isCallRecord() { // 判断是否为通话记录笔记
+        return (mParentId == Notes.ID_CALL_RECORD_FOLDER && !TextUtils.isEmpty(mPhoneNumber)); // 如果父ID为通话记录且电话号码不为空
+    }
+
+    public static int getNoteType(Cursor cursor) { // 根据游标获取笔记类型
+        return cursor.getInt(TYPE_COLUMN); // 返回笔记类型
+    }
+}

src/net/micode/notes/ui/NoteItemData.java

@@ -0,0 +1,224 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui;
+
+import android.content.Context;
+import android.database.Cursor;
+import android.text.TextUtils;
+
+import net.micode.notes.data.Contact;
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.NoteColumns;
+import net.micode.notes.tool.DataUtils;
+
+
+public class NoteItemData {
+    static final String [] PROJECTION = new String [] {
+        NoteColumns.ID,
+        NoteColumns.ALERTED_DATE,
+        NoteColumns.BG_COLOR_ID,
+        NoteColumns.CREATED_DATE,
+        NoteColumns.HAS_ATTACHMENT,
+        NoteColumns.MODIFIED_DATE,
+        NoteColumns.NOTES_COUNT,
+        NoteColumns.PARENT_ID,
+        NoteColumns.SNIPPET,
+        NoteColumns.TYPE,
+        NoteColumns.WIDGET_ID,
+        NoteColumns.WIDGET_TYPE,
+    };
+
+    private static final int ID_COLUMN                    = 0;
+    private static final int ALERTED_DATE_COLUMN          = 1;
+    private static final int BG_COLOR_ID_COLUMN           = 2;
+    private static final int CREATED_DATE_COLUMN          = 3;
+    private static final int HAS_ATTACHMENT_COLUMN        = 4;
+    private static final int MODIFIED_DATE_COLUMN         = 5;
+    private static final int NOTES_COUNT_COLUMN           = 6;
+    private static final int PARENT_ID_COLUMN             = 7;
+    private static final int SNIPPET_COLUMN               = 8;
+    private static final int TYPE_COLUMN                  = 9;
+    private static final int WIDGET_ID_COLUMN             = 10;
+    private static final int WIDGET_TYPE_COLUMN           = 11;
+
+    private long mId;
+    private long mAlertDate;
+    private int mBgColorId;
+    private long mCreatedDate;
+    private boolean mHasAttachment;
+    private long mModifiedDate;
+    private int mNotesCount;
+    private long mParentId;
+    private String mSnippet;
+    private int mType;
+    private int mWidgetId;
+    private int mWidgetType;
+    private String mName;
+    private String mPhoneNumber;
+
+    private boolean mIsLastItem;
+    private boolean mIsFirstItem;
+    private boolean mIsOnlyOneItem;
+    private boolean mIsOneNoteFollowingFolder;
+    private boolean mIsMultiNotesFollowingFolder;
+
+    public NoteItemData(Context context, Cursor cursor) {
+        mId = cursor.getLong(ID_COLUMN);
+        mAlertDate = cursor.getLong(ALERTED_DATE_COLUMN);
+        mBgColorId = cursor.getInt(BG_COLOR_ID_COLUMN);
+        mCreatedDate = cursor.getLong(CREATED_DATE_COLUMN);
+        mHasAttachment = (cursor.getInt(HAS_ATTACHMENT_COLUMN) > 0) ? true : false;
+        mModifiedDate = cursor.getLong(MODIFIED_DATE_COLUMN);
+        mNotesCount = cursor.getInt(NOTES_COUNT_COLUMN);
+        mParentId = cursor.getLong(PARENT_ID_COLUMN);
+        mSnippet = cursor.getString(SNIPPET_COLUMN);
+        mSnippet = mSnippet.replace(NoteEditActivity.TAG_CHECKED, "").replace(
+                NoteEditActivity.TAG_UNCHECKED, "");
+        mType = cursor.getInt(TYPE_COLUMN);
+        mWidgetId = cursor.getInt(WIDGET_ID_COLUMN);
+        mWidgetType = cursor.getInt(WIDGET_TYPE_COLUMN);
+
+        mPhoneNumber = "";
+        if (mParentId == Notes.ID_CALL_RECORD_FOLDER) {
+            mPhoneNumber = DataUtils.getCallNumberByNoteId(context.getContentResolver(), mId);
+            if (!TextUtils.isEmpty(mPhoneNumber)) {
+                mName = Contact.getContact(context, mPhoneNumber);
+                if (mName == null) {
+                    mName = mPhoneNumber;
+                }
+            }
+        }
+
+        if (mName == null) {
+            mName = "";
+        }
+        checkPostion(cursor);
+    }
+
+    private void checkPostion(Cursor cursor) {
+        mIsLastItem = cursor.isLast() ? true : false;
+        mIsFirstItem = cursor.isFirst() ? true : false;
+        mIsOnlyOneItem = (cursor.getCount() == 1);
+        mIsMultiNotesFollowingFolder = false;
+        mIsOneNoteFollowingFolder = false;
+
+        if (mType == Notes.TYPE_NOTE && !mIsFirstItem) {
+            int position = cursor.getPosition();
+            if (cursor.moveToPrevious()) {
+                if (cursor.getInt(TYPE_COLUMN) == Notes.TYPE_FOLDER
+                        || cursor.getInt(TYPE_COLUMN) == Notes.TYPE_SYSTEM) {
+                    if (cursor.getCount() > (position + 1)) {
+                        mIsMultiNotesFollowingFolder = true;
+                    } else {
+                        mIsOneNoteFollowingFolder = true;
+                    }
+                }
+                if (!cursor.moveToNext()) {
+                    throw new IllegalStateException("cursor move to previous but can't move back");
+                }
+            }
+        }
+    }
+
+    public boolean isOneFollowingFolder() {
+        return mIsOneNoteFollowingFolder;
+    }
+
+    public boolean isMultiFollowingFolder() {
+        return mIsMultiNotesFollowingFolder;
+    }
+
+    public boolean isLast() {
+        return mIsLastItem;
+    }
+
+    public String getCallName() {
+        return mName;
+    }
+
+    public boolean isFirst() {
+        return mIsFirstItem;
+    }
+
+    public boolean isSingle() {
+        return mIsOnlyOneItem;
+    }
+
+    public long getId() {
+        return mId;
+    }
+
+    public long getAlertDate() {
+        return mAlertDate;
+    }
+
+    public long getCreatedDate() {
+        return mCreatedDate;
+    }
+
+    public boolean hasAttachment() {
+        return mHasAttachment;
+    }
+
+    public long getModifiedDate() {
+        return mModifiedDate;
+    }
+
+    public int getBgColorId() {
+        return mBgColorId;
+    }
+
+    public long getParentId() {
+        return mParentId;
+    }
+
+    public int getNotesCount() {
+        return mNotesCount;
+    }
+
+    public long getFolderId () {
+        return mParentId;
+    }
+
+    public int getType() {
+        return mType;
+    }
+
+    public int getWidgetType() {
+        return mWidgetType;
+    }
+
+    public int getWidgetId() {
+        return mWidgetId;
+    }
+
+    public String getSnippet() {
+        return mSnippet;
+    }
+
+    public boolean hasAlert() {
+        return (mAlertDate > 0);
+    }
+
+    public boolean isCallRecord() {
+        return (mParentId == Notes.ID_CALL_RECORD_FOLDER && !TextUtils.isEmpty(mPhoneNumber));
+    }
+
+    public static int getNoteType(Cursor cursor) {
+        return cursor.getInt(TYPE_COLUMN);
+    }
+}

src/net/micode/notes/ui/NotesListActivity-note.java

@@ -0,0 +1,949 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui; // 定义包名
+
+import android.app.Activity; // 导入Activity类
+import android.app.AlertDialog; // 导入AlertDialog类
+import android.app.Dialog; // 导入Dialog类
+import android.appwidget.AppWidgetManager; // 导入AppWidgetManager类
+import android.content.AsyncQueryHandler; // 导入AsyncQueryHandler类
+import android.content.ContentResolver; // 导入ContentResolver类
+import android.content.ContentValues; // 导入ContentValues类
+import android.content.Context; // 导入Context类
+import android.content.DialogInterface; // 导入DialogInterface类
+import android.content.Intent; // 导入Intent类
+import android.content.SharedPreferences; // 导入SharedPreferences类
+import android.database.Cursor; // 导入Cursor类
+import android.os.AsyncTask; // 导入AsyncTask类
+import android.os.Bundle; // 导入Bundle类
+import android.preference.PreferenceManager; // 导入PreferenceManager类
+import android.text.Editable; // 导入Editable接口
+import android.text.TextUtils; // 导入TextUtils类
+import android.text.TextWatcher; // 导入TextWatcher接口
+import android.util.Log; // 导入Log类
+import android.view.ActionMode; // 导入ActionMode类
+import android.view.ContextMenu; // 导入ContextMenu类
+import android.view.ContextMenu.ContextMenuInfo; // 导入上下文菜单信息类
+import android.view.Display; // 导入Display类
+import android.view.LayoutInflater; // 导入LayoutInflater类
+import android.view.Menu; // 导入Menu类
+import android.view.MenuItem; // 导入MenuItem类
+import android.view.MenuItem.OnMenuItemClickListener; // 导入菜单项点击监听器接口
+import android.view.MotionEvent; // 导入MotionEvent类
+import android.view.View; // 导入View类
+import android.view.View.OnClickListener; // 导入视图点击监听器接口
+import android.view.View.OnCreateContextMenuListener; // 导入创建上下文菜单监听器接口
+import android.view.View.OnTouchListener; // 导入触摸监听器接口
+import android.view.inputmethod.InputMethodManager; // 导入输入法管理器类
+import android.widget.AdapterView; // 导入AdapterView类
+import android.widget.AdapterView.OnItemClickListener; // 导入适配器视图项目点击监听器接口
+import android.widget.AdapterView.OnItemLongClickListener; // 导入适配器视图项目长按监听器接口
+import android.widget.Button; // 导入Button类
+import android.widget.EditText; // 导入EditText类
+import android.widget.ListView; // 导入ListView类
+import android.widget.PopupMenu; // 导入PopupMenu类
+import android.widget.TextView; // 导入TextView类
+import android.widget.Toast; // 导入Toast类
+
+import net.micode.notes.R; // 导入资源类
+import net.micode.notes.data.Notes; // 导入Notes数据类
+import net.micode.notes.data.Notes.NoteColumns; // 导入Notes列类
+import net.micode.notes.gtask.remote.GTaskSyncService; // 导入GTaskSyncService类
+import net.micode.notes.model.WorkingNote; // 导入WorkingNote模型类
+import net.micode.notes.tool.BackupUtils; // 导入BackupUtils工具类
+import net.micode.notes.tool.DataUtils; // 导入DataUtils工具类
+import net.micode.notes.tool.ResourceParser; // 导入ResourceParser解析工具类
+import net.micode.notes.ui.NotesListAdapter.AppWidgetAttribute; // 导入小部件属性类
+import net.micode.notes.widget.NoteWidgetProvider_2x; // 导入2x笔记小部件提供者
+import net.micode.notes.widget.NoteWidgetProvider_4x; // 导入4x笔记小部件提供者
+
+import java.io.BufferedReader; // 导入BufferedReader类
+import java.io.IOException; // 导入IOException类
+import java.io.InputStream; // 导入InputStream类
+import java.io.InputStreamReader; // 导入InputStreamReader类
+import java.util.HashSet; // 导入HashSet类
+
+public class NotesListActivity extends Activity implements OnClickListener, OnItemLongClickListener { // 定义NotesListActivity类，继承Activity并实现点击和长按监听接口
+    private static final int FOLDER_NOTE_LIST_QUERY_TOKEN = 0; // 文件夹笔记列表查询令牌
+
+    private static final int FOLDER_LIST_QUERY_TOKEN      = 1; // 文件夹列表查询令牌
+
+    private static final int MENU_FOLDER_DELETE = 0; // 文件夹删除菜单项ID
+
+    private static final int MENU_FOLDER_VIEW = 1; // 文件夹查看菜单项ID
+
+    private static final int MENU_FOLDER_CHANGE_NAME = 2; // 文件夹更名菜单项ID
+
+    private static final String PREFERENCE_ADD_INTRODUCTION = "net.micode.notes.introduction"; // 添加介绍的偏好设置键
+
+    private enum ListEditState { // 列表编辑状态枚举
+        NOTE_LIST, SUB_FOLDER, CALL_RECORD_FOLDER // 状态: 笔记列表、子文件夹、通话记录文件夹
+    };
+
+    private ListEditState mState; // 当前状态
+
+    private BackgroundQueryHandler mBackgroundQueryHandler; // 后台查询处理类
+
+    private NotesListAdapter mNotesListAdapter; // 笔记列表适配器
+
+    private ListView mNotesListView; // 笔记列表视图
+
+    private Button mAddNewNote; // 新增笔记按钮
+
+    private boolean mDispatch; // 是否分发事件的标志
+
+    private int mOriginY; // 事件起始Y坐标
+
+    private int mDispatchY; // 分发事件的Y坐标
+
+    private TextView mTitleBar; // 标题栏文本视图
+
+    private long mCurrentFolderId; // 当前文件夹ID
+
+    private ContentResolver mContentResolver; // 内容解析器
+
+    private ModeCallback mModeCallBack; // 模式回调
+
+    private static final String TAG = "NotesListActivity"; // 日志标签
+
+    public static final int NOTES_LISTVIEW_SCROLL_RATE = 30; // 笔记列表滚动速率
+
+    private NoteItemData mFocusNoteDataItem; // 当前聚焦的笔记数据项
+
+    private static final String NORMAL_SELECTION = NoteColumns.PARENT_ID + "=?"; // 正常查询条件
+
+    private static final String ROOT_FOLDER_SELECTION = "(" + NoteColumns.TYPE + "<>"
+            + Notes.TYPE_SYSTEM + " AND " + NoteColumns.PARENT_ID + "=?)" + " OR ("
+            + NoteColumns.ID + "=" + Notes.ID_CALL_RECORD_FOLDER + " AND "
+            + NoteColumns.NOTES_COUNT + ">0)"; // 根文件夹查询条件
+
+    private final static int REQUEST_CODE_OPEN_NODE = 102; // 打开节点请求代码
+    private final static int REQUEST_CODE_NEW_NODE  = 103; // 新增节点请求代码
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) { // 当Activity创建时调用
+        super.onCreate(savedInstanceState); // 调用父类的onCreate方法
+        setContentView(R.layout.note_list); // 设置内容视图为笔记列表布局
+        initResources(); // 初始化资源
+
+        /**
+         * 在用户首次使用此应用时插入介绍
+         */
+        setAppInfoFromRawRes(); // 从原始资源中设置应用信息
+    }
+
+    @Override
+    protected void onActivityResult(int requestCode, int resultCode, Intent data) { // 当Activity的结果回调时调用
+        if (resultCode == RESULT_OK
+                && (requestCode == REQUEST_CODE_OPEN_NODE || requestCode == REQUEST_CODE_NEW_NODE)) { // 如果结果成功且请求码是打开节点或新建节点
+            mNotesListAdapter.changeCursor(null); // 更新适配器的光标
+        } else {
+            super.onActivityResult(requestCode, resultCode, data); // 调用父类的onActivityResult方法
+        }
+    }
+
+    private void setAppInfoFromRawRes() { // 从原始资源设置应用信息
+        SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this); // 获取默认的共享偏好设置
+        if (!sp.getBoolean(PREFERENCE_ADD_INTRODUCTION, false)) { // 检查是否已经添加介绍
+            StringBuilder sb = new StringBuilder(); // 创建字符串构建器
+            InputStream in = null; // 初始化输入流
+            try {
+                 in = getResources().openRawResource(R.raw.introduction); // 打开原始资源文件
+                if (in != null) {
+                    InputStreamReader isr = new InputStreamReader(in); // 输入流读取器
+                    BufferedReader br = new BufferedReader(isr); // 缓冲读取器
+                    char [] buf = new char[1024]; // 创建字符缓冲区
+                    int len = 0; // 字符长度初始化
+                    while ((len = br.read(buf)) > 0) { // 逐行读取
+                        sb.append(buf, 0, len); // 将读取的内容追加到字符串构建器
+                    }
+                } else {
+                    Log.e(TAG, "Read introduction file error"); // 日志输出读取介绍文件错误
+                    return; // 返回
+                }
+            } catch (IOException e) { // 捕获IO异常
+                e.printStackTrace(); // 打印异常
+                return; // 返回
+            } finally { // 在finally中确保关闭输入流
+                if(in != null) { // 如果输入流不为空
+                    try {
+                        in.close(); // 关闭输入流
+                    } catch (IOException e) { // 捕获关闭过程中出现的IO异常
+                        e.printStackTrace(); // 打印异常
+                    }
+                }
+            }
+
+            WorkingNote note = WorkingNote.createEmptyNote(this, Notes.ID_ROOT_FOLDER, // 创建空笔记
+                    AppWidgetManager.INVALID_APPWIDGET_ID, Notes.TYPE_WIDGET_INVALIDE,
+                    ResourceParser.RED); // 使用红色背景
+            note.setWorkingText(sb.toString()); // 设置工作文本为读取的介绍内容
+            if (note.saveNote()) { // 如果保存成功
+                sp.edit().putBoolean(PREFERENCE_ADD_INTRODUCTION, true).commit(); // 更新共享偏好设置为已添加介绍
+            } else {
+                Log.e(TAG, "Save introduction note error"); // 日志输出保存介绍笔记错误
+                return; // 返回
+            }
+        }
+    }
+
+    @Override
+    protected void onStart() { // 当Activity启动时调用
+        super.onStart(); // 调用父类的onStart方法
+        startAsyncNotesListQuery(); // 启动异步笔记列表查询
+    }
+
+    private void initResources() { // 初始化资源的方法
+        mContentResolver = this.getContentResolver(); // 获取内容解析器
+        mBackgroundQueryHandler = new BackgroundQueryHandler(this.getContentResolver()); // 初始化后台查询处理器
+        mCurrentFolderId = Notes.ID_ROOT_FOLDER; // 初始化当前文件夹ID为根文件夹ID
+        mNotesListView = (ListView) findViewById(R.id.notes_list); // 查找笔记列表视图
+        mNotesListView.addFooterView(LayoutInflater.from(this).inflate(R.layout.note_list_footer, null), // 添加页脚视图
+                null, false);
+        mNotesListView.setOnItemClickListener(new OnListItemClickListener()); // 设置列表项点击监听器
+        mNotesListView.setOnItemLongClickListener(this); // 设置列表项长按监听器
+        mNotesListAdapter = new NotesListAdapter(this); // 创建笔记列表适配器
+        mNotesListView.setAdapter(mNotesListAdapter); // 将适配器设置到列表视图
+        mAddNewNote = (Button) findViewById(R.id.btn_new_note); // 查找新增笔记按钮
+        mAddNewNote.setOnClickListener(this); // 设置新增笔记按钮的点击监听器
+        mAddNewNote.setOnTouchListener(new NewNoteOnTouchListener()); // 设置新增笔记按钮的触摸监听器
+        mDispatch = false; // 初始化事件分发标志
+        mDispatchY = 0; // 初始化Y坐标
+        mOriginY = 0; // 初始化起始Y坐标
+        mTitleBar = (TextView) findViewById(R.id.tv_title_bar); // 查找标题栏文本视图
+        mState = ListEditState.NOTE_LIST; // 初始化为笔记列表状态
+        mModeCallBack = new ModeCallback(); // 初始化模式回调
+    }
+
+    private class ModeCallback implements ListView.MultiChoiceModeListener, OnMenuItemClickListener { // 定义模式回调类，处理多选择模式和菜单项点击
+        private DropdownMenu mDropDownMenu; // 下拉菜单
+        private ActionMode mActionMode; // 动作模式
+        private MenuItem mMoveMenu; // 移动菜单项
+
+        public boolean onCreateActionMode(ActionMode mode, Menu menu) { // 创建动作模式时调用
+            getMenuInflater().inflate(R.menu.note_list_options, menu); // 加载菜单
+            menu.findItem(R.id.delete).setOnMenuItemClickListener(this); // 设置删除菜单项的点击监听器
+            mMoveMenu = menu.findItem(R.id.move); // 查找移动菜单项
+            if (mFocusNoteDataItem.getParentId() == Notes.ID_CALL_RECORD_FOLDER // 判断当前笔记的父ID是否为通话记录文件夹
+                    || DataUtils.getUserFolderCount(mContentResolver) == 0) {
+                mMoveMenu.setVisible(false); // 若是，则隐藏移动菜单项
+            } else {
+                mMoveMenu.setVisible(true); // 否则，显示移动菜单项
+                mMoveMenu.setOnMenuItemClickListener(this); // 设置移动菜单项的点击监听器
+            }
+            mActionMode = mode; // 设置当前动作模式
+            mNotesListAdapter.setChoiceMode(true); // 启用适配器的选择模式
+            mNotesListView.setLongClickable(false); // 禁用列表长按
+            mAddNewNote.setVisibility(View.GONE); // 隐藏新增笔记按钮
+
+            View customView = LayoutInflater.from(NotesListActivity.this).inflate( // 创建自定义视图
+                    R.layout.note_list_dropdown_menu, null);
+            mode.setCustomView(customView); // 设置自定义视图
+            mDropDownMenu = new DropdownMenu(NotesListActivity.this, // 创建下拉菜单
+                    (Button) customView.findViewById(R.id.selection_menu),
+                    R.menu.note_list_dropdown);
+            mDropDownMenu.setOnDropdownMenuItemClickListener(new PopupMenu.OnMenuItemClickListener(){ // 设置下拉菜单项点击监听器
+                public boolean onMenuItemClick(MenuItem item) {
+                    mNotesListAdapter.selectAll(!mNotesListAdapter.isAllSelected()); // 切换全选状态
+                    updateMenu(); // 更新菜单
+                    return true; // 返回true，表示事件已处理
+                }
+
+            });
+            return true; // 返回true，表示创建成功
+        }
+
+        private void updateMenu() { // 更新菜单的方法
+            int selectedCount = mNotesListAdapter.getSelectedCount(); // 获取选中项数量
+            // 更新下拉菜单
+            String format = getResources().getString(R.string.menu_select_title, selectedCount); // 格式化标题
+            mDropDownMenu.setTitle(format); // 设置下拉菜单标题
+            MenuItem item = mDropDownMenu.findItem(R.id.action_select_all); // 查找全选菜单项
+            if (item != null) {
+                if (mNotesListAdapter.isAllSelected()) { // 如果全选状态为真
+                    item.setChecked(true); // 设置为已选中
+                    item.setTitle(R.string.menu_deselect_all); // 更新标题为取消全选
+                } else {
+                    item.setChecked(false); // 否则设置为未选中
+                    item.setTitle(R.string.menu_select_all); // 更新标题为全选
+                }
+            }
+        }
+
+        public boolean onPrepareActionMode(ActionMode mode, Menu menu) { // 准备动作模式时调用
+            return false; // 默认返回false，表示不改变菜单
+        }
+
+        public boolean onActionItemClicked(ActionMode mode, MenuItem item) { // 动作模式中菜单项点击事件
+            return false; // 默认返回false
+        }
+
+        public void onDestroyActionMode(ActionMode mode) { // 动作模式销毁时调用
+            mNotesListAdapter.setChoiceMode(false); // 关闭适配器选择模式
+            mNotesListView.setLongClickable(true); // 启用长按
+            mAddNewNote.setVisibility(View.VISIBLE); // 显示新增笔记按钮
+        }
+
+        public void finishActionMode() { // 结束动作模式
+            mActionMode.finish(); // 结束当前动作模式
+        }
+
+        public void onItemCheckedStateChanged(ActionMode mode, int position, long id, boolean checked) { // 选中状态变化时调用
+            mNotesListAdapter.setCheckedItem(position, checked); // 更新选中项状态
+            updateMenu(); // 更新菜单
+        }
+
+        public boolean onMenuItemClick(MenuItem item) { // 菜单项点击事件
+            if (mNotesListAdapter.getSelectedCount() == 0) { // 如果没有选中项
+                Toast.makeText(NotesListActivity.this, getString(R.string.menu_select_none), // 显示提示
+                        Toast.LENGTH_SHORT).show();
+                return true; // 返回true，表示事件已处理
+            }
+
+            switch (item.getItemId()) { // 根据菜单项ID处理事件
+                case R.id.delete: // 删除菜单项
+                    AlertDialog.Builder builder = new AlertDialog.Builder(NotesListActivity.this); // 创建删除确认对话框
+                    builder.setTitle(getString(R.string.alert_title_delete)); // 设置对话框标题
+                    builder.setIcon(android.R.drawable.ic_dialog_alert); // 设置对话框图标
+                    builder.setMessage(getString(R.string.alert_message_delete_notes, // 设置对话框消息
+                                             mNotesListAdapter.getSelectedCount()));
+                    builder.setPositiveButton(android.R.string.ok, // 点击确认按钮时的事件
+                                             new DialogInterface.OnClickListener() {
+                                                 public void onClick(DialogInterface dialog, int which) {
+                                                     batchDelete(); // 批量删除选中的笔记
+                                                 }
+                                             });
+                    builder.setNegativeButton(android.R.string.cancel, null); // 设置取消按钮
+                    builder.show(); // 显示对话框
+                    break;
+                case R.id.move: // 移动菜单项
+                    startQueryDestinationFolders(); // 查询可移动的文件夹
+                    break;
+                default:
+                    return false; // 默认返回false，表示未处理
+            }
+            return true; // 返回true，表示菜单项已处理
+        }
+    }
+
+    private class NewNoteOnTouchListener implements OnTouchListener { // 新增笔记按钮的触摸监听器
+
+        public boolean onTouch(View v, MotionEvent event) { // 触摸事件处理
+            switch (event.getAction()) { // 根据触摸事件类型进行处理
+                case MotionEvent.ACTION_DOWN: { // 按下事件
+                    Display display = getWindowManager().getDefaultDisplay(); // 获取窗口显示
+                    int screenHeight = display.getHeight(); // 获取屏幕高度
+                    int newNoteViewHeight = mAddNewNote.getHeight(); // 获取新增笔记按钮的高度
+                    int start = screenHeight - newNoteViewHeight; // 计算按钮起始位置
+                    int eventY = start + (int) event.getY(); // 事件Y坐标
+                    /**
+                     * 减去标题栏高度
+                     */
+                    if (mState == ListEditState.SUB_FOLDER) { // 如果当前状态为子文件夹
+                        eventY -= mTitleBar.getHeight(); // 在Y坐标上减去标题栏高度
+                        start -= mTitleBar.getHeight();
+                    }
+                    /**
+                     * HACKME: 当点击“新增笔记”按钮的透明部分时，将事件分发给
+                     * 后面的列表视图。此按钮的透明部分可以用公式y=-0.12x+94(
+                     * 单位:像素)表示，并且这条线就是按钮的顶部。
+                     * 坐标基于“新增笔记”按钮的左边界。94表示透明部分的最大高度。
+                     * 注意，如果按钮的背景变化，这个公式也会变化。这是非常糟糕的，只是为了
+                     * UI设计师的强烈要求。
+                     */
+                    if (event.getY() < (event.getX() * (-0.12) + 94)) { // 如果触摸点在透明区域
+                        View view = mNotesListView.getChildAt(mNotesListView.getChildCount() - 1 // 获取列表最后一个子视图
+                                - mNotesListView.getFooterViewsCount());
+                        if (view != null && view.getBottom() > start // 检查触摸点是否在列表最底部的范围内
+                                && (view.getTop() < (start + 94))) {
+                            mOriginY = (int) event.getY(); // 记录触摸事件的Y坐标
+                            mDispatchY = eventY; // 更新分发Y坐标
+                            event.setLocation(event.getX(), mDispatchY); // 设置触摸事件位置
+                            mDispatch = true; // 将分发标志设置为true
+                            return mNotesListView.dispatchTouchEvent(event); // 将事件分发给列表视图
+                        }
+                    }
+                    break;
+                }
+                case MotionEvent.ACTION_MOVE: { // 移动事件
+                    if (mDispatch) { // 如果分发标志为true
+                        mDispatchY += (int) event.getY() - mOriginY; // 更新分发Y坐标
+                        event.setLocation(event.getX(), mDispatchY); // 设置触摸事件位置
+                        return mNotesListView.dispatchTouchEvent(event); // 将事件分发给列表视图
+                    }
+                    break;
+                }
+                default: { // 默认事件处理
+                    if (mDispatch) { // 如果分发标志为true
+                        event.setLocation(event.getX(), mDispatchY); // 设置触摸事件位置
+                        mDispatch = false; // 重置分发标志
+                        return mNotesListView.dispatchTouchEvent(event); // 将事件分发给列表视图
+                    }
+                    break;
+                }
+            }
+            return false; // 返回false，表示未处理
+        }
+
+    };
+
+    private void startAsyncNotesListQuery() { // 启动异步笔记列表查询的方法
+        String selection = (mCurrentFolderId == Notes.ID_ROOT_FOLDER) ? ROOT_FOLDER_SELECTION // 根据当前文件夹ID选择查询条件
+                : NORMAL_SELECTION;
+        mBackgroundQueryHandler.startQuery(FOLDER_NOTE_LIST_QUERY_TOKEN, // 启动查询
+                null,
+                Notes.CONTENT_NOTE_URI, // 查询URI
+                NoteItemData.PROJECTION, // 查询的列
+                selection, // 查询条件
+                new String[] { // 查询参数
+                        String.valueOf(mCurrentFolderId)
+                },
+                NoteColumns.TYPE + " DESC," + NoteColumns.MODIFIED_DATE + " DESC"); // 排序条件
+    }
+
+    private final class BackgroundQueryHandler extends AsyncQueryHandler { // 定义后台查询处理器类
+        public BackgroundQueryHandler(ContentResolver contentResolver) {
+            super(contentResolver); // 调用父类构造函数
+        }
+
+        @Override
+        protected void onQueryComplete(int token, Object cookie, Cursor cursor) { // 查询完成时调用
+            switch (token) { // 根据查询令牌处理
+                case FOLDER_NOTE_LIST_QUERY_TOKEN:
+                    mNotesListAdapter.changeCursor(cursor); // 更新适配器的光标
+                    break;
+                case FOLDER_LIST_QUERY_TOKEN:
+                    if (cursor != null && cursor.getCount() > 0) { // 如果游标不为空且有结果
+                        showFolderListMenu(cursor); // 显示文件夹列表菜单
+                    } else {
+                        Log.e(TAG, "Query folder failed"); // 日志错误输出
+                    }
+                    break;
+                default:
+                    return; // 默认返回
+            }
+        }
+    }
+
+    private void showFolderListMenu(Cursor cursor) { // 显示文件夹列表菜单的方法
+        AlertDialog.Builder builder = new AlertDialog.Builder(NotesListActivity.this); // 创建对话框构建器
+        builder.setTitle(R.string.menu_title_select_folder); // 设置对话框标题
+        final FoldersListAdapter adapter = new FoldersListAdapter(this, cursor); // 创建文件夹列表适配器
+        builder.setAdapter(adapter, new DialogInterface.OnClickListener() { // 设置适配器和点击监听器
+            public void onClick(DialogInterface dialog, int which) { // 对话框项目点击事件
+                DataUtils.batchMoveToFolder(mContentResolver, // 批量移动已选笔记到目标文件夹
+                        mNotesListAdapter.getSelectedItemIds(), adapter.getItemId(which));
+                Toast.makeText( // 显示成功提示
+                        NotesListActivity.this,
+                        getString(R.string.format_move_notes_to_folder,
+                                mNotesListAdapter.getSelectedCount(),
+                                adapter.getFolderName(NotesListActivity.this, which)),
+                        Toast.LENGTH_SHORT).show();
+                mModeCallBack.finishActionMode(); // 结束模式回调
+            }
+        });
+        builder.show(); // 显示对话框
+    }
+
+    private void createNewNote() { // 创建新笔记的方法
+        Intent intent = new Intent(this, NoteEditActivity.class); // 创建意图
+        intent.setAction(Intent.ACTION_INSERT_OR_EDIT); // 设置操作为插入或编辑
+        intent.putExtra(Notes.INTENT_EXTRA_FOLDER_ID, mCurrentFolderId); // 添加当前文件夹ID到意图
+        this.startActivityForResult(intent, REQUEST_CODE_NEW_NODE); // 启动新Activity并请求结果
+    }
+
+    private void batchDelete() { // 批量删除的方法
+        new AsyncTask<Void, Void, HashSet<AppWidgetAttribute>>() { // 创建异步任务
+            protected HashSet<AppWidgetAttribute> doInBackground(Void... unused) { // 背景线程执行的任务
+                HashSet<AppWidgetAttribute> widgets = mNotesListAdapter.getSelectedWidget(); // 获取已选中的小部件
+                if (!isSyncMode()) { // 如果不在同步模式
+                    // 不在同步模式时，直接删除笔记
+                    if (DataUtils.batchDeleteNotes(mContentResolver, mNotesListAdapter
+                            .getSelectedItemIds())) {
+                    } else {
+                        Log.e(TAG, "Delete Note error"); // 日志输出删除笔记错误
+                    }
+                } else { // 在同步模式
+                    // 在同步模式下，将删除的笔记移动到回收站文件夹
+                    if (!DataUtils.batchMoveToFolder(mContentResolver, mNotesListAdapter
+                            .getSelectedItemIds(), Notes.ID_TRASH_FOLER)) { // 移动到回收站
+                        Log.e(TAG, "Move notes to trash folder error, should not happens"); // 日志输出错误信息
+                    }
+                }
+                return widgets; // 返回小部件集合
+            }
+
+            @Override
+            protected void onPostExecute(HashSet<AppWidgetAttribute> widgets) { // 任务完成后调用
+                if (widgets != null) { // 如果小部件不为空
+                    for (AppWidgetAttribute widget : widgets) { // 遍历小部件集合
+                        if (widget.widgetId != AppWidgetManager.INVALID_APPWIDGET_ID // 检查小部件ID是否有效
+                                && widget.widgetType != Notes.TYPE_WIDGET_INVALIDE) { // 检查小部件类型是否有效
+                            updateWidget(widget.widgetId, widget.widgetType); // 更新小部件
+                        }
+                    }
+                }
+                mModeCallBack.finishActionMode(); // 结束模式回调
+            }
+        }.execute(); // 执行异步任务
+    }
+
+    private void deleteFolder(long folderId) { // 删除指定文件夹的方法
+        if (folderId == Notes.ID_ROOT_FOLDER) { // 如果是根文件夹ID
+            Log.e(TAG, "Wrong folder id, should not happen " + folderId); // 日志错误输出
+            return; // 返回
+        }
+
+        HashSet<Long> ids = new HashSet<Long>(); // 创建ID集合
+        ids.add(folderId); // 将文件夹ID添加到集合
+        HashSet<AppWidgetAttribute> widgets = DataUtils.getFolderNoteWidget(mContentResolver,
+                folderId); // 获取该文件夹相关的小部件
+        if (!isSyncMode()) { // 如果不在同步模式
+            // 如果不在同步模式，直接删除文件夹
+            DataUtils.batchDeleteNotes(mContentResolver, ids); // 批量删除笔记
+        } else { // 在同步模式
+            // 在同步模式下，将删除的文件夹移动到回收站
+            DataUtils.batchMoveToFolder(mContentResolver, ids, Notes.ID_TRASH_FOLER);
+        }
+        if (widgets != null) { // 如果小部件不为空
+            for (AppWidgetAttribute widget : widgets) { // 遍历小部件集合
+                if (widget.widgetId != AppWidgetManager.INVALID_APPWIDGET_ID // 检查小部件ID是否有效
+                        && widget.widgetType != Notes.TYPE_WIDGET_INVALIDE) { // 检查小部件类型是否有效
+                    updateWidget(widget.widgetId, widget.widgetType); // 更新小部件
+                }
+            }
+        }
+    }
+
+    private void openNode(NoteItemData data) { // 打开指定笔记的方法
+        Intent intent = new Intent(this, NoteEditActivity.class); // 创建打开笔记的意图
+        intent.setAction(Intent.ACTION_VIEW); // 设置操作为查看
+        intent.putExtra(Intent.EXTRA_UID, data.getId()); // 添加笔记ID到意图
+        this.startActivityForResult(intent, REQUEST_CODE_OPEN_NODE); // 启动笔记编辑Activity并请求结果
+    }
+
+    private void openFolder(NoteItemData data) { // 打开指定文件夹的方法
+        mCurrentFolderId = data.getId(); // 设置当前文件夹ID
+        startAsyncNotesListQuery(); // 启动异步笔记列表查询
+        if (data.getId() == Notes.ID_CALL_RECORD_FOLDER) { // 如果是通话记录文件夹
+            mState = ListEditState.CALL_RECORD_FOLDER; // 更新状态为通话记录
+            mAddNewNote.setVisibility(View.GONE); // 隐藏新增笔记按钮
+        } else {
+            mState = ListEditState.SUB_FOLDER; // 更新状态为子文件夹
+        }
+        if (data.getId() == Notes.ID_CALL_RECORD_FOLDER) { // 如果是通话记录文件夹
+            mTitleBar.setText(R.string.call_record_folder_name); // 设置标题为通话记录文件夹名称
+        } else {
+            mTitleBar.setText(data.getSnippet()); // 设置标题为文件夹的摘要
+        }
+        mTitleBar.setVisibility(View.VISIBLE); // 显示标题栏
+    }
+
+    public void onClick(View v) { // 按钮点击处理
+        switch (v.getId()) { // 根据视图ID处理不同的点击事件
+            case R.id.btn_new_note: // 新增笔记按钮
+                createNewNote(); // 创建新笔记
+                break;
+            default:
+                break; // 默认情况下不处理
+        }
+    }
+
+    private void showSoftInput() { // 显示软输入法的方法
+        InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE); // 获取输入法管理器
+        if (inputMethodManager != null) { // 如果输入法管理器不为null
+            inputMethodManager.toggleSoftInput(InputMethodManager.SHOW_FORCED, 0); // 切换软输入法显示
+        }
+    }
+
+    private void hideSoftInput(View view) { // 隐藏软输入法的方法
+        InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE); // 获取输入法管理器
+        inputMethodManager.hideSoftInputFromWindow(view.getWindowToken(), 0); // 隐藏软输入法
+    }
+
+    private void showCreateOrModifyFolderDialog(final boolean create) { // 显示创建或修改文件夹对话框的方法
+        final AlertDialog.Builder builder = new AlertDialog.Builder(this); // 创建对话框构建器
+        View view = LayoutInflater.from(this).inflate(R.layout.dialog_edit_text, null); // 加载对话框布局
+        final EditText etName = (EditText) view.findViewById(R.id.et_foler_name); // 获取文件夹名称输入框
+        showSoftInput(); // 显示软输入法
+        if (!create) { // 如果是修改操作
+            if (mFocusNoteDataItem != null) { // 如果当前聚焦的笔记数据项不为null
+                etName.setText(mFocusNoteDataItem.getSnippet()); // 设置输入框文本为当前笔记摘要
+                builder.setTitle(getString(R.string.menu_folder_change_name)); // 设置对话框标题为修改名称
+            } else {
+                Log.e(TAG, "The long click data item is null"); // 日志输出错误信息
+                return; // 返回
+            }
+        } else {
+            etName.setText(""); // 清空输入框
+            builder.setTitle(this.getString(R.string.menu_create_folder)); // 设置对话框标题为创建文件夹
+        }
+
+        builder.setPositiveButton(android.R.string.ok, null); // 设置确认按钮
+        builder.setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() { // 设置取消按钮
+            public void onClick(DialogInterface dialog, int which) {
+                hideSoftInput(etName); // 隐藏软输入法
+            }
+        });
+
+        final Dialog dialog = builder.setView(view).show(); // 显示对话框
+        final Button positive = (Button)dialog.findViewById(android.R.id.button1); // 获取确认按钮
+        positive.setOnClickListener(new OnClickListener() { // 设置确认按钮的点击事件
+            public void onClick(View v) {
+                hideSoftInput(etName); // 隐藏软输入法
+                String name = etName.getText().toString(); // 获取输入框文本
+                if (DataUtils.checkVisibleFolderName(mContentResolver, name)) { // 检查文件夹名称是否存在
+                    Toast.makeText(NotesListActivity.this, getString(R.string.folder_exist, name),
+                            Toast.LENGTH_LONG).show(); // 显示文件夹已存在的提示
+                    etName.setSelection(0, etName.length()); // 设置焦点到输入框
+                    return; // 返回
+                }
+                if (!create) { // 如果是修改文件夹名称
+                    if (!TextUtils.isEmpty(name)) { // 如果输入框不为空
+                        ContentValues values = new ContentValues(); // 创建ContentValues
+                        values.put(NoteColumns.SNIPPET, name); // 添加名称
+                        values.put(NoteColumns.TYPE, Notes.TYPE_FOLDER); // 添加类型
+                        values.put(NoteColumns.LOCAL_MODIFIED, 1); // 标记为本地修改
+                        mContentResolver.update(Notes.CONTENT_NOTE_URI, values, NoteColumns.ID // 更新文件夹信息
+                                + "=?", new String[] {
+                            String.valueOf(mFocusNoteDataItem.getId()) // 用当前文件夹ID更新
+                        });
+                    }
+                } else if (!TextUtils.isEmpty(name)) { // 如果是创建新文件夹且输入框不为空
+                    ContentValues values = new ContentValues(); // 创建ContentValues
+                    values.put(NoteColumns.SNIPPET, name); // 添加文件夹名称
+                    values.put(NoteColumns.TYPE, Notes.TYPE_FOLDER); // 设置类型为文件夹
+                    mContentResolver.insert(Notes.CONTENT_NOTE_URI, values); // 插入新文件夹到数据库
+                }
+                dialog.dismiss(); // 关闭对话框
+            }
+        });
+
+        if (TextUtils.isEmpty(etName.getText())) { // 如果输入框没有内容
+            positive.setEnabled(false); // 禁用确认按钮
+        }
+        /**
+         * 当名称编辑框为空时，禁用确认按钮
+         */
+        etName.addTextChangedListener(new TextWatcher() { // 添加文本变化监听器
+            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
+                // 不处理
+            }
+
+            public void onTextChanged(CharSequence s, int start, int before, int count) { // 文本变化时调用
+                if (TextUtils.isEmpty(etName.getText())) { // 如果输入框为空
+                    positive.setEnabled(false); // 禁用确认按钮
+                } else {
+                    positive.setEnabled(true); // 否则启用确认按钮
+                }
+            }
+
+            public void afterTextChanged(Editable s) {
+                // 不处理
+            }
+        });
+    }
+
+    @Override
+    public void onBackPressed() { // 当按下返回按钮时调用
+        switch (mState) { // 根据当前状态处理
+            case SUB_FOLDER: // 如果为子文件夹状态
+                mCurrentFolderId = Notes.ID_ROOT_FOLDER; // 设置当前文件夹ID为根文件夹ID
+                mState = ListEditState.NOTE_LIST; // 更新状态为笔记列表
+                startAsyncNotesListQuery(); // 启动异步笔记列表查询
+                mTitleBar.setVisibility(View.GONE); // 隐藏标题栏
+                break;
+            case CALL_RECORD_FOLDER: // 如果为通话记录文件夹状态
+                mCurrentFolderId = Notes.ID_ROOT_FOLDER; // 设置当前文件夹ID为根文件夹ID
+                mState = ListEditState.NOTE_LIST; // 更新状态为笔记列表
+                mAddNewNote.setVisibility(View.VISIBLE); // 显示新增笔记按钮
+                mTitleBar.setVisibility(View.GONE); // 隐藏标题栏
+                startAsyncNotesListQuery(); // 启动异步笔记列表查询
+                break;
+            case NOTE_LIST: // 如果为笔记列表状态
+                super.onBackPressed(); // 调用父类返回
+                break;
+            default:
+                break; // 默认情况不处理
+        }
+    }
+
+    private void updateWidget(int appWidgetId, int appWidgetType) { // 更新小部件的方法
+        Intent intent = new Intent(AppWidgetManager.ACTION_APPWIDGET_UPDATE); // 创建更新小部件的Intent
+        if (appWidgetType == Notes.TYPE_WIDGET_2X) { // 如果小部件类型为2x
+            intent.setClass(this, NoteWidgetProvider_2x.class); // 设置为2x小部件提供者
+        } else if (appWidgetType == Notes.TYPE_WIDGET_4X) { // 如果小部件类型为4x
+            intent.setClass(this, NoteWidgetProvider_4x.class); // 设置为4x小部件提供者
+        } else {
+            Log.e(TAG, "Unspported widget type"); // 日志输出不支持的小部件类型
+            return; // 返回
+        }
+
+        intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, new int[] { // 将小部件ID放入Intent中
+            appWidgetId
+        });
+
+        sendBroadcast(intent); // 发送广播以更新小部件
+        setResult(RESULT_OK, intent); // 设置结果为成功
+    }
+
+    private final OnCreateContextMenuListener mFolderOnCreateContextMenuListener = new OnCreateContextMenuListener() { // 创建文件夹上下文菜单的监听器
+        public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) { // 创建上下文菜单时调用
+            if (mFocusNoteDataItem != null) { // 如果当前聚焦的笔记数据项不为null
+                menu.setHeaderTitle(mFocusNoteDataItem.getSnippet()); // 设置菜单标题为当前笔记摘要
+                menu.add(0, MENU_FOLDER_VIEW, 0, R.string.menu_folder_view); // 添加查看文件夹菜单项
+                menu.add(0, MENU_FOLDER_DELETE, 0, R.string.menu_folder_delete); // 添加删除文件夹菜单项
+                menu.add(0, MENU_FOLDER_CHANGE_NAME, 0, R.string.menu_folder_change_name); // 添加更改文件夹名称菜单项
+            }
+        }
+    };
+
+    @Override
+    public void onContextMenuClosed(Menu menu) { // 当上下文菜单关闭时调用
+        if (mNotesListView != null) { // 如果笔记列表视图不为空
+            mNotesListView.setOnCreateContextMenuListener(null); // 清除上下文菜单创建监听器
+        }
+        super.onContextMenuClosed(menu); // 调用父类的处理方法
+    }
+
+    @Override
+    public boolean onContextItemSelected(MenuItem item) { // 当上下文菜单项被选中时调用
+        if (mFocusNoteDataItem == null) { // 如果当前聚焦的笔记数据项为空
+            Log.e(TAG, "The long click data item is null"); // 日志输出错误信息
+            return false; // 返回false
+        }
+        switch (item.getItemId()) { // 根据菜单项ID处理操作
+            case MENU_FOLDER_VIEW: // 查看文件夹菜单项
+                openFolder(mFocusNoteDataItem); // 打开文件夹
+                break;
+            case MENU_FOLDER_DELETE: // 删除文件夹菜单项
+                AlertDialog.Builder builder = new AlertDialog.Builder(this); // 创建删除确认对话框
+                builder.setTitle(getString(R.string.alert_title_delete)); // 设置对话框标题
+                builder.setIcon(android.R.drawable.ic_dialog_alert); // 设置对话框图标
+                builder.setMessage(getString(R.string.alert_message_delete_folder)); // 设置对话框消息
+                builder.setPositiveButton(android.R.string.ok, // 设置确认按钮
+                        new DialogInterface.OnClickListener() {
+                            public void onClick(DialogInterface dialog, int which) {
+                                deleteFolder(mFocusNoteDataItem.getId()); // 删除当前聚焦的文件夹
+                            }
+                        });
+                builder.setNegativeButton(android.R.string.cancel, null); // 设置取消按钮
+                builder.show(); // 显示对话框
+                break;
+            case MENU_FOLDER_CHANGE_NAME: // 更改文件夹名称菜单项
+                showCreateOrModifyFolderDialog(false); // 显示修改文件夹对话框
+                break;
+            default:
+                break; // 默认不处理
+        }
+
+        return true; // 返回true，表示操作已处理
+    }
+
+    @Override
+    public boolean onPrepareOptionsMenu(Menu menu) { // 准备选项菜单时调用
+        menu.clear(); // 清空菜单
+        if (mState == ListEditState.NOTE_LIST) { // 如果当前状态是笔记列表
+            getMenuInflater().inflate(R.menu.note_list, menu); // 加载笔记列表菜单
+            // 设置同步或取消同步
+            menu.findItem(R.id.menu_sync).setTitle(
+                    GTaskSyncService.isSyncing() ? R.string.menu_sync_cancel : R.string.menu_sync);
+        } else if (mState == ListEditState.SUB_FOLDER) { // 如果当前状态是子文件夹
+            getMenuInflater().inflate(R.menu.sub_folder, menu); // 加载子文件夹菜单
+        } else if (mState == ListEditState.CALL_RECORD_FOLDER) { // 如果当前状态是通话记录文件夹
+            getMenuInflater().inflate(R.menu.call_record_folder, menu); // 加载通话记录文件夹菜单
+        } else {
+            Log.e(TAG, "Wrong state:" + mState); // 日志输出错误状态
+        }
+        return true; // 返回true，表示菜单准备成功
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) { // 处理选项菜单项选择的事件
+        switch (item.getItemId()) { // 根据菜单项的ID执行相应操作
+            case R.id.menu_new_folder: { // 新建文件夹菜单项
+                showCreateOrModifyFolderDialog(true); // 显示创建文件夹对话框
+                break;
+            }
+            case R.id.menu_export_text: { // 导出文本菜单项
+                exportNoteToText(); // 导出笔记为文本
+                break;
+            }
+            case R.id.menu_sync: { // 同步菜单项
+                if (isSyncMode()) { // 如果是同步模式
+                    if (TextUtils.equals(item.getTitle(), getString(R.string.menu_sync))) { // 如果菜单标题为同步
+                        GTaskSyncService.startSync(this); // 启动同步服务
+                    } else {
+                        GTaskSyncService.cancelSync(this); // 取消同步
+                    }
+                } else {
+                    startPreferenceActivity(); // 启动设置Activity
+                }
+                break;
+            }
+            case R.id.menu_setting: { // 设置菜单项
+                startPreferenceActivity(); // 启动设置Activity
+                break;
+            }
+            case R.id.menu_new_note: { // 新建笔记菜单项
+                createNewNote(); // 创建新笔记
+                break;
+            }
+            case R.id.menu_search: // 搜索菜单项
+                onSearchRequested(); // 请求搜索
+                break;
+            default:
+                break; // 默认不处理
+        }
+        return true; // 返回true，表示菜单项已处理
+    }
+
+    @Override
+    public boolean onSearchRequested() { // 当搜索请求时被调用
+        startSearch(null, false, null /* appData */, false); // 启动搜索
+        return true; // 返回true，表示事件已处理
+    }
+
+    private void exportNoteToText() { // 导出笔记为文本的方法
+        final BackupUtils backup = BackupUtils.getInstance(NotesListActivity.this); // 获取备份工具实例
+        new AsyncTask<Void, Void, Integer>() { // 创建异步任务
+
+            @Override
+            protected Integer doInBackground(Void... unused) { // 在后台执行的任务
+                return backup.exportToText(); // 调用导出方法
+            }
+
+            @Override
+            protected void onPostExecute(Integer result) { // 任务执行完毕后调用
+                if (result == BackupUtils.STATE_SD_CARD_UNMOUONTED) { // 如果SD卡未挂载
+                    AlertDialog.Builder builder = new AlertDialog.Builder(NotesListActivity.this); // 创建警告对话框
+                    builder.setTitle(NotesListActivity.this
+                            .getString(R.string.failed_sdcard_export)); // 设置对话框标题
+                    builder.setMessage(NotesListActivity.this
+                            .getString(R.string.error_sdcard_unmounted)); // 设置对话框消息
+                    builder.setPositiveButton(android.R.string.ok, null); // 设置确认按钮
+                    builder.show(); // 显示对话框
+                } else if (result == BackupUtils.STATE_SUCCESS) { // 如果导出成功
+                    AlertDialog.Builder builder = new AlertDialog.Builder(NotesListActivity.this); // 创建成功对话框
+                    builder.setTitle(NotesListActivity.this
+                            .getString(R.string.success_sdcard_export)); // 设置标题
+                    builder.setMessage(NotesListActivity.this.getString(
+                            R.string.format_exported_file_location, backup
+                                    .getExportedTextFileName(), backup.getExportedTextFileDir())); // 设置导出文件位置消息
+                    builder.setPositiveButton(android.R.string.ok, null); // 设置确认按钮
+                    builder.show(); // 显示对话框
+                } else if (result == BackupUtils.STATE_SYSTEM_ERROR) { // 如果系统错误
+                    AlertDialog.Builder builder = new AlertDialog.Builder(NotesListActivity.this); // 创建错误对话框
+                    builder.setTitle(NotesListActivity.this
+                            .getString(R.string.failed_sdcard_export)); // 设置标题
+                    builder.setMessage(NotesListActivity.this
+                            .getString(R.string.error_sdcard_export)); // 设置消息
+                    builder.setPositiveButton(android.R.string.ok, null); // 设置确认按钮
+                    builder.show(); // 显示对话框
+                }
+            }
+
+        }.execute(); // 执行异步任务
+    }
+
+    private boolean isSyncMode() { // 判断是否在同步模式的方法
+        return NotesPreferenceActivity.getSyncAccountName(this).trim().length() > 0; // 如果同步账户名称不为空则返回true
+    }
+
+    private void startPreferenceActivity() { // 启动设置Activity的方法
+        Activity from = getParent() != null ? getParent() : this; // 获取父Activity，如果没有则使用当前Activity
+        Intent intent = new Intent(from, NotesPreferenceActivity.class); // 创建意图
+        from.startActivityIfNeeded(intent, -1); // 启动设置Activity
+    }
+
+    private class OnListItemClickListener implements OnItemClickListener { // 定义内部类 OnListItemClickListener，实现列表项点击监听器
+
+    public void onItemClick(AdapterView<?> parent, View view, int position, long id) { // 处理点击事件
+        if (view instanceof NotesListItem) { // 检查点击的视图是否为 NotesListItem 实例
+            NoteItemData item = ((NotesListItem) view).getItemData(); // 获取点击的项数据
+
+            if (mNotesListAdapter.isInChoiceMode()) { // 如果适配器处于选择模式
+                if (item.getType() == Notes.TYPE_NOTE) { // 如果点击的项是笔记类型
+                    position = position - mNotesListView.getHeaderViewsCount(); // 调整位置，以考虑头部视图的数量
+                    mModeCallBack.onItemCheckedStateChanged(null, position, id, // 通知模式回调选中状态变化
+                            !mNotesListAdapter.isSelectedItem(position)); // 设置选中状态为相反
+                }
+                return; // 返回，不再处理其他情况
+            }
+
+            switch (mState) { // 根据当前状态处理不同的逻辑
+                case NOTE_LIST: // 笔记列表状态
+                    if (item.getType() == Notes.TYPE_FOLDER // 如果为文件夹类型
+                            || item.getType() == Notes.TYPE_SYSTEM) { // 或者是系统类型
+                        openFolder(item); // 打开文件夹
+                    } else if (item.getType() == Notes.TYPE_NOTE) { // 如果是笔记类型
+                        openNode(item); // 打开笔记
+                    } else {
+                        Log.e(TAG, "Wrong note type in NOTE_LIST"); // 日志输出错误信息
+                    }
+                    break;
+                case SUB_FOLDER: // 子文件夹状态
+                case CALL_RECORD_FOLDER: // 通话记录文件夹状态
+                    if (item.getType() == Notes.TYPE_NOTE) { // 如果是笔记类型
+                        openNode(item); // 打开笔记
+                    } else {
+                        Log.e(TAG, "Wrong note type in SUB_FOLDER"); // 日志输出错误信息
+                    }
+                    break;
+                default: // 默认情况
+                    break;
+            }
+        }
+    }
+
+}
+
+private void startQueryDestinationFolders() { // 启动查询目标文件夹的方法
+    // 定义选择条件，选择类型为文件夹的项且父ID不等于当前文件夹ID，且ID不等于通话记录文件夹ID 
+    String selection = NoteColumns.TYPE + "=? AND " + NoteColumns.PARENT_ID + "<>? AND " + NoteColumns.ID + "<>?";
+    selection = (mState == ListEditState.NOTE_LIST) ? selection : // 如果当前状态是笔记列表
+        "(" + selection + ") OR (" + NoteColumns.ID + "=" + Notes.ID_ROOT_FOLDER + ")"; // 否则也查询根文件夹
+
+    mBackgroundQueryHandler.startQuery(FOLDER_LIST_QUERY_TOKEN, // 启动异步查询
+            null,
+            Notes.CONTENT_NOTE_URI, // 查询的URI
+            FoldersListAdapter.PROJECTION, // 查询的列
+            selection, // 查询条件
+            new String[] { // 查询参数
+                String.valueOf(Notes.TYPE_FOLDER), // 当前选择的文件夹
+                String.valueOf(Notes.ID_TRASH_FOLER), // 回收站文件夹ID
+                String.valueOf(mCurrentFolderId) // 当前文件夹ID
+            },
+            NoteColumns.MODIFIED_DATE + " DESC"); // 按修改日期降序排序
+}
+
+public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) { // 处理长按事件
+    if (view instanceof NotesListItem) { // 如果视图是 NotesListItem 实例
+        mFocusNoteDataItem = ((NotesListItem) view).getItemData(); // 获取当前聚焦的笔记数据项
+        if (mFocusNoteDataItem.getType() == Notes.TYPE_NOTE && !mNotesListAdapter.isInChoiceMode()) { // 如果为笔记类型且不在选择模式
+            if (mNotesListView.startActionMode(mModeCallBack) != null) { // 启动动作模式
+                mModeCallBack.onItemCheckedStateChanged(null, position, id, true); // 通知选中项
+                mNotesListView.performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); // 执行触觉反馈
+            } else {
+                Log.e(TAG, "startActionMode fails"); // 日志输出错误信息
+            }
+        } else if (mFocusNoteDataItem.getType() == Notes.TYPE_FOLDER) { // 如果为文件夹类型
+            mNotesListView.setOnCreateContextMenuListener(mFolderOnCreateContextMenuListener); // 设置上下文菜单监听器
+        }
+    }
+    return false; // 返回false，表示未处理
+}

src/net/micode/notes/ui/NotesListActivity.java

@@ -0,0 +1,954 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui;
+
+import android.app.Activity;
+import android.app.AlertDialog;
+import android.app.Dialog;
+import android.appwidget.AppWidgetManager;
+import android.content.AsyncQueryHandler;
+import android.content.ContentResolver;
+import android.content.ContentValues;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.content.Intent;
+import android.content.SharedPreferences;
+import android.database.Cursor;
+import android.os.AsyncTask;
+import android.os.Bundle;
+import android.preference.PreferenceManager;
+import android.text.Editable;
+import android.text.TextUtils;
+import android.text.TextWatcher;
+import android.util.Log;
+import android.view.ActionMode;
+import android.view.ContextMenu;
+import android.view.ContextMenu.ContextMenuInfo;
+import android.view.Display;
+import android.view.HapticFeedbackConstants;
+import android.view.LayoutInflater;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.view.MenuItem.OnMenuItemClickListener;
+import android.view.MotionEvent;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.view.View.OnCreateContextMenuListener;
+import android.view.View.OnTouchListener;
+import android.view.inputmethod.InputMethodManager;
+import android.widget.AdapterView;
+import android.widget.AdapterView.OnItemClickListener;
+import android.widget.AdapterView.OnItemLongClickListener;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.ListView;
+import android.widget.PopupMenu;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import net.micode.notes.R;
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.NoteColumns;
+import net.micode.notes.gtask.remote.GTaskSyncService;
+import net.micode.notes.model.WorkingNote;
+import net.micode.notes.tool.BackupUtils;
+import net.micode.notes.tool.DataUtils;
+import net.micode.notes.tool.ResourceParser;
+import net.micode.notes.ui.NotesListAdapter.AppWidgetAttribute;
+import net.micode.notes.widget.NoteWidgetProvider_2x;
+import net.micode.notes.widget.NoteWidgetProvider_4x;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.util.HashSet;
+
+public class NotesListActivity extends Activity implements OnClickListener, OnItemLongClickListener {
+    private static final int FOLDER_NOTE_LIST_QUERY_TOKEN = 0;
+
+    private static final int FOLDER_LIST_QUERY_TOKEN      = 1;
+
+    private static final int MENU_FOLDER_DELETE = 0;
+
+    private static final int MENU_FOLDER_VIEW = 1;
+
+    private static final int MENU_FOLDER_CHANGE_NAME = 2;
+
+    private static final String PREFERENCE_ADD_INTRODUCTION = "net.micode.notes.introduction";
+
+    private enum ListEditState {
+        NOTE_LIST, SUB_FOLDER, CALL_RECORD_FOLDER
+    };
+
+    private ListEditState mState;
+
+    private BackgroundQueryHandler mBackgroundQueryHandler;
+
+    private NotesListAdapter mNotesListAdapter;
+
+    private ListView mNotesListView;
+
+    private Button mAddNewNote;
+
+    private boolean mDispatch;
+
+    private int mOriginY;
+
+    private int mDispatchY;
+
+    private TextView mTitleBar;
+
+    private long mCurrentFolderId;
+
+    private ContentResolver mContentResolver;
+
+    private ModeCallback mModeCallBack;
+
+    private static final String TAG = "NotesListActivity";
+
+    public static final int NOTES_LISTVIEW_SCROLL_RATE = 30;
+
+    private NoteItemData mFocusNoteDataItem;
+
+    private static final String NORMAL_SELECTION = NoteColumns.PARENT_ID + "=?";
+
+    private static final String ROOT_FOLDER_SELECTION = "(" + NoteColumns.TYPE + "<>"
+            + Notes.TYPE_SYSTEM + " AND " + NoteColumns.PARENT_ID + "=?)" + " OR ("
+            + NoteColumns.ID + "=" + Notes.ID_CALL_RECORD_FOLDER + " AND "
+            + NoteColumns.NOTES_COUNT + ">0)";
+
+    private final static int REQUEST_CODE_OPEN_NODE = 102;
+    private final static int REQUEST_CODE_NEW_NODE  = 103;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.note_list);
+        initResources();
+
+        /**
+         * Insert an introduction when user firstly use this application
+         */
+        setAppInfoFromRawRes();
+    }
+
+    @Override
+    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
+        if (resultCode == RESULT_OK
+                && (requestCode == REQUEST_CODE_OPEN_NODE || requestCode == REQUEST_CODE_NEW_NODE)) {
+            mNotesListAdapter.changeCursor(null);
+        } else {
+            super.onActivityResult(requestCode, resultCode, data);
+        }
+    }
+
+    private void setAppInfoFromRawRes() {
+        SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
+        if (!sp.getBoolean(PREFERENCE_ADD_INTRODUCTION, false)) {
+            StringBuilder sb = new StringBuilder();
+            InputStream in = null;
+            try {
+                 in = getResources().openRawResource(R.raw.introduction);
+                if (in != null) {
+                    InputStreamReader isr = new InputStreamReader(in);
+                    BufferedReader br = new BufferedReader(isr);
+                    char [] buf = new char[1024];
+                    int len = 0;
+                    while ((len = br.read(buf)) > 0) {
+                        sb.append(buf, 0, len);
+                    }
+                } else {
+                    Log.e(TAG, "Read introduction file error");
+                    return;
+                }
+            } catch (IOException e) {
+                e.printStackTrace();
+                return;
+            } finally {
+                if(in != null) {
+                    try {
+                        in.close();
+                    } catch (IOException e) {
+                        // TODO Auto-generated catch block
+                        e.printStackTrace();
+                    }
+                }
+            }
+
+            WorkingNote note = WorkingNote.createEmptyNote(this, Notes.ID_ROOT_FOLDER,
+                    AppWidgetManager.INVALID_APPWIDGET_ID, Notes.TYPE_WIDGET_INVALIDE,
+                    ResourceParser.RED);
+            note.setWorkingText(sb.toString());
+            if (note.saveNote()) {
+                sp.edit().putBoolean(PREFERENCE_ADD_INTRODUCTION, true).commit();
+            } else {
+                Log.e(TAG, "Save introduction note error");
+                return;
+            }
+        }
+    }
+
+    @Override
+    protected void onStart() {
+        super.onStart();
+        startAsyncNotesListQuery();
+    }
+
+    private void initResources() {
+        mContentResolver = this.getContentResolver();
+        mBackgroundQueryHandler = new BackgroundQueryHandler(this.getContentResolver());
+        mCurrentFolderId = Notes.ID_ROOT_FOLDER;
+        mNotesListView = (ListView) findViewById(R.id.notes_list);
+        mNotesListView.addFooterView(LayoutInflater.from(this).inflate(R.layout.note_list_footer, null),
+                null, false);
+        mNotesListView.setOnItemClickListener(new OnListItemClickListener());
+        mNotesListView.setOnItemLongClickListener(this);
+        mNotesListAdapter = new NotesListAdapter(this);
+        mNotesListView.setAdapter(mNotesListAdapter);
+        mAddNewNote = (Button) findViewById(R.id.btn_new_note);
+        mAddNewNote.setOnClickListener(this);
+        mAddNewNote.setOnTouchListener(new NewNoteOnTouchListener());
+        mDispatch = false;
+        mDispatchY = 0;
+        mOriginY = 0;
+        mTitleBar = (TextView) findViewById(R.id.tv_title_bar);
+        mState = ListEditState.NOTE_LIST;
+        mModeCallBack = new ModeCallback();
+    }
+
+    private class ModeCallback implements ListView.MultiChoiceModeListener, OnMenuItemClickListener {
+        private DropdownMenu mDropDownMenu;
+        private ActionMode mActionMode;
+        private MenuItem mMoveMenu;
+
+        public boolean onCreateActionMode(ActionMode mode, Menu menu) {
+            getMenuInflater().inflate(R.menu.note_list_options, menu);
+            menu.findItem(R.id.delete).setOnMenuItemClickListener(this);
+            mMoveMenu = menu.findItem(R.id.move);
+            if (mFocusNoteDataItem.getParentId() == Notes.ID_CALL_RECORD_FOLDER
+                    || DataUtils.getUserFolderCount(mContentResolver) == 0) {
+                mMoveMenu.setVisible(false);
+            } else {
+                mMoveMenu.setVisible(true);
+                mMoveMenu.setOnMenuItemClickListener(this);
+            }
+            mActionMode = mode;
+            mNotesListAdapter.setChoiceMode(true);
+            mNotesListView.setLongClickable(false);
+            mAddNewNote.setVisibility(View.GONE);
+
+            View customView = LayoutInflater.from(NotesListActivity.this).inflate(
+                    R.layout.note_list_dropdown_menu, null);
+            mode.setCustomView(customView);
+            mDropDownMenu = new DropdownMenu(NotesListActivity.this,
+                    (Button) customView.findViewById(R.id.selection_menu),
+                    R.menu.note_list_dropdown);
+            mDropDownMenu.setOnDropdownMenuItemClickListener(new PopupMenu.OnMenuItemClickListener(){
+                public boolean onMenuItemClick(MenuItem item) {
+                    mNotesListAdapter.selectAll(!mNotesListAdapter.isAllSelected());
+                    updateMenu();
+                    return true;
+                }
+
+            });
+            return true;
+        }
+
+        private void updateMenu() {
+            int selectedCount = mNotesListAdapter.getSelectedCount();
+            // Update dropdown menu
+            String format = getResources().getString(R.string.menu_select_title, selectedCount);
+            mDropDownMenu.setTitle(format);
+            MenuItem item = mDropDownMenu.findItem(R.id.action_select_all);
+            if (item != null) {
+                if (mNotesListAdapter.isAllSelected()) {
+                    item.setChecked(true);
+                    item.setTitle(R.string.menu_deselect_all);
+                } else {
+                    item.setChecked(false);
+                    item.setTitle(R.string.menu_select_all);
+                }
+            }
+        }
+
+        public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
+            // TODO Auto-generated method stub
+            return false;
+        }
+
+        public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
+            // TODO Auto-generated method stub
+            return false;
+        }
+
+        public void onDestroyActionMode(ActionMode mode) {
+            mNotesListAdapter.setChoiceMode(false);
+            mNotesListView.setLongClickable(true);
+            mAddNewNote.setVisibility(View.VISIBLE);
+        }
+
+        public void finishActionMode() {
+            mActionMode.finish();
+        }
+
+        public void onItemCheckedStateChanged(ActionMode mode, int position, long id,
+                boolean checked) {
+            mNotesListAdapter.setCheckedItem(position, checked);
+            updateMenu();
+        }
+
+        public boolean onMenuItemClick(MenuItem item) {
+            if (mNotesListAdapter.getSelectedCount() == 0) {
+                Toast.makeText(NotesListActivity.this, getString(R.string.menu_select_none),
+                        Toast.LENGTH_SHORT).show();
+                return true;
+            }
+
+            switch (item.getItemId()) {
+                case R.id.delete:
+                    AlertDialog.Builder builder = new AlertDialog.Builder(NotesListActivity.this);
+                    builder.setTitle(getString(R.string.alert_title_delete));
+                    builder.setIcon(android.R.drawable.ic_dialog_alert);
+                    builder.setMessage(getString(R.string.alert_message_delete_notes,
+                                             mNotesListAdapter.getSelectedCount()));
+                    builder.setPositiveButton(android.R.string.ok,
+                                             new DialogInterface.OnClickListener() {
+                                                 public void onClick(DialogInterface dialog,
+                                                         int which) {
+                                                     batchDelete();
+                                                 }
+                                             });
+                    builder.setNegativeButton(android.R.string.cancel, null);
+                    builder.show();
+                    break;
+                case R.id.move:
+                    startQueryDestinationFolders();
+                    break;
+                default:
+                    return false;
+            }
+            return true;
+        }
+    }
+
+    private class NewNoteOnTouchListener implements OnTouchListener {
+
+        public boolean onTouch(View v, MotionEvent event) {
+            switch (event.getAction()) {
+                case MotionEvent.ACTION_DOWN: {
+                    Display display = getWindowManager().getDefaultDisplay();
+                    int screenHeight = display.getHeight();
+                    int newNoteViewHeight = mAddNewNote.getHeight();
+                    int start = screenHeight - newNoteViewHeight;
+                    int eventY = start + (int) event.getY();
+                    /**
+                     * Minus TitleBar's height
+                     */
+                    if (mState == ListEditState.SUB_FOLDER) {
+                        eventY -= mTitleBar.getHeight();
+                        start -= mTitleBar.getHeight();
+                    }
+                    /**
+                     * HACKME:When click the transparent part of "New Note" button, dispatch
+                     * the event to the list view behind this button. The transparent part of
+                     * "New Note" button could be expressed by formula y=-0.12x+94（Unit:pixel）
+                     * and the line top of the button. The coordinate based on left of the "New
+                     * Note" button. The 94 represents maximum height of the transparent part.
+                     * Notice that, if the background of the button changes, the formula should
+                     * also change. This is very bad, just for the UI designer's strong requirement.
+                     */
+                    if (event.getY() < (event.getX() * (-0.12) + 94)) {
+                        View view = mNotesListView.getChildAt(mNotesListView.getChildCount() - 1
+                                - mNotesListView.getFooterViewsCount());
+                        if (view != null && view.getBottom() > start
+                                && (view.getTop() < (start + 94))) {
+                            mOriginY = (int) event.getY();
+                            mDispatchY = eventY;
+                            event.setLocation(event.getX(), mDispatchY);
+                            mDispatch = true;
+                            return mNotesListView.dispatchTouchEvent(event);
+                        }
+                    }
+                    break;
+                }
+                case MotionEvent.ACTION_MOVE: {
+                    if (mDispatch) {
+                        mDispatchY += (int) event.getY() - mOriginY;
+                        event.setLocation(event.getX(), mDispatchY);
+                        return mNotesListView.dispatchTouchEvent(event);
+                    }
+                    break;
+                }
+                default: {
+                    if (mDispatch) {
+                        event.setLocation(event.getX(), mDispatchY);
+                        mDispatch = false;
+                        return mNotesListView.dispatchTouchEvent(event);
+                    }
+                    break;
+                }
+            }
+            return false;
+        }
+
+    };
+
+    private void startAsyncNotesListQuery() {
+        String selection = (mCurrentFolderId == Notes.ID_ROOT_FOLDER) ? ROOT_FOLDER_SELECTION
+                : NORMAL_SELECTION;
+        mBackgroundQueryHandler.startQuery(FOLDER_NOTE_LIST_QUERY_TOKEN, null,
+                Notes.CONTENT_NOTE_URI, NoteItemData.PROJECTION, selection, new String[] {
+                    String.valueOf(mCurrentFolderId)
+                }, NoteColumns.TYPE + " DESC," + NoteColumns.MODIFIED_DATE + " DESC");
+    }
+
+    private final class BackgroundQueryHandler extends AsyncQueryHandler {
+        public BackgroundQueryHandler(ContentResolver contentResolver) {
+            super(contentResolver);
+        }
+
+        @Override
+        protected void onQueryComplete(int token, Object cookie, Cursor cursor) {
+            switch (token) {
+                case FOLDER_NOTE_LIST_QUERY_TOKEN:
+                    mNotesListAdapter.changeCursor(cursor);
+                    break;
+                case FOLDER_LIST_QUERY_TOKEN:
+                    if (cursor != null && cursor.getCount() > 0) {
+                        showFolderListMenu(cursor);
+                    } else {
+                        Log.e(TAG, "Query folder failed");
+                    }
+                    break;
+                default:
+                    return;
+            }
+        }
+    }
+
+    private void showFolderListMenu(Cursor cursor) {
+        AlertDialog.Builder builder = new AlertDialog.Builder(NotesListActivity.this);
+        builder.setTitle(R.string.menu_title_select_folder);
+        final FoldersListAdapter adapter = new FoldersListAdapter(this, cursor);
+        builder.setAdapter(adapter, new DialogInterface.OnClickListener() {
+
+            public void onClick(DialogInterface dialog, int which) {
+                DataUtils.batchMoveToFolder(mContentResolver,
+                        mNotesListAdapter.getSelectedItemIds(), adapter.getItemId(which));
+                Toast.makeText(
+                        NotesListActivity.this,
+                        getString(R.string.format_move_notes_to_folder,
+                                mNotesListAdapter.getSelectedCount(),
+                                adapter.getFolderName(NotesListActivity.this, which)),
+                        Toast.LENGTH_SHORT).show();
+                mModeCallBack.finishActionMode();
+            }
+        });
+        builder.show();
+    }
+
+    private void createNewNote() {
+        Intent intent = new Intent(this, NoteEditActivity.class);
+        intent.setAction(Intent.ACTION_INSERT_OR_EDIT);
+        intent.putExtra(Notes.INTENT_EXTRA_FOLDER_ID, mCurrentFolderId);
+        this.startActivityForResult(intent, REQUEST_CODE_NEW_NODE);
+    }
+
+    private void batchDelete() {
+        new AsyncTask<Void, Void, HashSet<AppWidgetAttribute>>() {
+            protected HashSet<AppWidgetAttribute> doInBackground(Void... unused) {
+                HashSet<AppWidgetAttribute> widgets = mNotesListAdapter.getSelectedWidget();
+                if (!isSyncMode()) {
+                    // if not synced, delete notes directly
+                    if (DataUtils.batchDeleteNotes(mContentResolver, mNotesListAdapter
+                            .getSelectedItemIds())) {
+                    } else {
+                        Log.e(TAG, "Delete notes error, should not happens");
+                    }
+                } else {
+                    // in sync mode, we'll move the deleted note into the trash
+                    // folder
+                    if (!DataUtils.batchMoveToFolder(mContentResolver, mNotesListAdapter
+                            .getSelectedItemIds(), Notes.ID_TRASH_FOLER)) {
+                        Log.e(TAG, "Move notes to trash folder error, should not happens");
+                    }
+                }
+                return widgets;
+            }
+
+            @Override
+            protected void onPostExecute(HashSet<AppWidgetAttribute> widgets) {
+                if (widgets != null) {
+                    for (AppWidgetAttribute widget : widgets) {
+                        if (widget.widgetId != AppWidgetManager.INVALID_APPWIDGET_ID
+                                && widget.widgetType != Notes.TYPE_WIDGET_INVALIDE) {
+                            updateWidget(widget.widgetId, widget.widgetType);
+                        }
+                    }
+                }
+                mModeCallBack.finishActionMode();
+            }
+        }.execute();
+    }
+
+    private void deleteFolder(long folderId) {
+        if (folderId == Notes.ID_ROOT_FOLDER) {
+            Log.e(TAG, "Wrong folder id, should not happen " + folderId);
+            return;
+        }
+
+        HashSet<Long> ids = new HashSet<Long>();
+        ids.add(folderId);
+        HashSet<AppWidgetAttribute> widgets = DataUtils.getFolderNoteWidget(mContentResolver,
+                folderId);
+        if (!isSyncMode()) {
+            // if not synced, delete folder directly
+            DataUtils.batchDeleteNotes(mContentResolver, ids);
+        } else {
+            // in sync mode, we'll move the deleted folder into the trash folder
+            DataUtils.batchMoveToFolder(mContentResolver, ids, Notes.ID_TRASH_FOLER);
+        }
+        if (widgets != null) {
+            for (AppWidgetAttribute widget : widgets) {
+                if (widget.widgetId != AppWidgetManager.INVALID_APPWIDGET_ID
+                        && widget.widgetType != Notes.TYPE_WIDGET_INVALIDE) {
+                    updateWidget(widget.widgetId, widget.widgetType);
+                }
+            }
+        }
+    }
+
+    private void openNode(NoteItemData data) {
+        Intent intent = new Intent(this, NoteEditActivity.class);
+        intent.setAction(Intent.ACTION_VIEW);
+        intent.putExtra(Intent.EXTRA_UID, data.getId());
+        this.startActivityForResult(intent, REQUEST_CODE_OPEN_NODE);
+    }
+
+    private void openFolder(NoteItemData data) {
+        mCurrentFolderId = data.getId();
+        startAsyncNotesListQuery();
+        if (data.getId() == Notes.ID_CALL_RECORD_FOLDER) {
+            mState = ListEditState.CALL_RECORD_FOLDER;
+            mAddNewNote.setVisibility(View.GONE);
+        } else {
+            mState = ListEditState.SUB_FOLDER;
+        }
+        if (data.getId() == Notes.ID_CALL_RECORD_FOLDER) {
+            mTitleBar.setText(R.string.call_record_folder_name);
+        } else {
+            mTitleBar.setText(data.getSnippet());
+        }
+        mTitleBar.setVisibility(View.VISIBLE);
+    }
+
+    public void onClick(View v) {
+        switch (v.getId()) {
+            case R.id.btn_new_note:
+                createNewNote();
+                break;
+            default:
+                break;
+        }
+    }
+
+    private void showSoftInput() {
+        InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
+        if (inputMethodManager != null) {
+            inputMethodManager.toggleSoftInput(InputMethodManager.SHOW_FORCED, 0);
+        }
+    }
+
+    private void hideSoftInput(View view) {
+        InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
+        inputMethodManager.hideSoftInputFromWindow(view.getWindowToken(), 0);
+    }
+
+    private void showCreateOrModifyFolderDialog(final boolean create) {
+        final AlertDialog.Builder builder = new AlertDialog.Builder(this);
+        View view = LayoutInflater.from(this).inflate(R.layout.dialog_edit_text, null);
+        final EditText etName = (EditText) view.findViewById(R.id.et_foler_name);
+        showSoftInput();
+        if (!create) {
+            if (mFocusNoteDataItem != null) {
+                etName.setText(mFocusNoteDataItem.getSnippet());
+                builder.setTitle(getString(R.string.menu_folder_change_name));
+            } else {
+                Log.e(TAG, "The long click data item is null");
+                return;
+            }
+        } else {
+            etName.setText("");
+            builder.setTitle(this.getString(R.string.menu_create_folder));
+        }
+
+        builder.setPositiveButton(android.R.string.ok, null);
+        builder.setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() {
+            public void onClick(DialogInterface dialog, int which) {
+                hideSoftInput(etName);
+            }
+        });
+
+        final Dialog dialog = builder.setView(view).show();
+        final Button positive = (Button)dialog.findViewById(android.R.id.button1);
+        positive.setOnClickListener(new OnClickListener() {
+            public void onClick(View v) {
+                hideSoftInput(etName);
+                String name = etName.getText().toString();
+                if (DataUtils.checkVisibleFolderName(mContentResolver, name)) {
+                    Toast.makeText(NotesListActivity.this, getString(R.string.folder_exist, name),
+                            Toast.LENGTH_LONG).show();
+                    etName.setSelection(0, etName.length());
+                    return;
+                }
+                if (!create) {
+                    if (!TextUtils.isEmpty(name)) {
+                        ContentValues values = new ContentValues();
+                        values.put(NoteColumns.SNIPPET, name);
+                        values.put(NoteColumns.TYPE, Notes.TYPE_FOLDER);
+                        values.put(NoteColumns.LOCAL_MODIFIED, 1);
+                        mContentResolver.update(Notes.CONTENT_NOTE_URI, values, NoteColumns.ID
+                                + "=?", new String[] {
+                            String.valueOf(mFocusNoteDataItem.getId())
+                        });
+                    }
+                } else if (!TextUtils.isEmpty(name)) {
+                    ContentValues values = new ContentValues();
+                    values.put(NoteColumns.SNIPPET, name);
+                    values.put(NoteColumns.TYPE, Notes.TYPE_FOLDER);
+                    mContentResolver.insert(Notes.CONTENT_NOTE_URI, values);
+                }
+                dialog.dismiss();
+            }
+        });
+
+        if (TextUtils.isEmpty(etName.getText())) {
+            positive.setEnabled(false);
+        }
+        /**
+         * When the name edit text is null, disable the positive button
+         */
+        etName.addTextChangedListener(new TextWatcher() {
+            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
+                // TODO Auto-generated method stub
+
+            }
+
+            public void onTextChanged(CharSequence s, int start, int before, int count) {
+                if (TextUtils.isEmpty(etName.getText())) {
+                    positive.setEnabled(false);
+                } else {
+                    positive.setEnabled(true);
+                }
+            }
+
+            public void afterTextChanged(Editable s) {
+                // TODO Auto-generated method stub
+
+            }
+        });
+    }
+
+    @Override
+    public void onBackPressed() {
+        switch (mState) {
+            case SUB_FOLDER:
+                mCurrentFolderId = Notes.ID_ROOT_FOLDER;
+                mState = ListEditState.NOTE_LIST;
+                startAsyncNotesListQuery();
+                mTitleBar.setVisibility(View.GONE);
+                break;
+            case CALL_RECORD_FOLDER:
+                mCurrentFolderId = Notes.ID_ROOT_FOLDER;
+                mState = ListEditState.NOTE_LIST;
+                mAddNewNote.setVisibility(View.VISIBLE);
+                mTitleBar.setVisibility(View.GONE);
+                startAsyncNotesListQuery();
+                break;
+            case NOTE_LIST:
+                super.onBackPressed();
+                break;
+            default:
+                break;
+        }
+    }
+
+    private void updateWidget(int appWidgetId, int appWidgetType) {
+        Intent intent = new Intent(AppWidgetManager.ACTION_APPWIDGET_UPDATE);
+        if (appWidgetType == Notes.TYPE_WIDGET_2X) {
+            intent.setClass(this, NoteWidgetProvider_2x.class);
+        } else if (appWidgetType == Notes.TYPE_WIDGET_4X) {
+            intent.setClass(this, NoteWidgetProvider_4x.class);
+        } else {
+            Log.e(TAG, "Unspported widget type");
+            return;
+        }
+
+        intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, new int[] {
+            appWidgetId
+        });
+
+        sendBroadcast(intent);
+        setResult(RESULT_OK, intent);
+    }
+
+    private final OnCreateContextMenuListener mFolderOnCreateContextMenuListener = new OnCreateContextMenuListener() {
+        public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {
+            if (mFocusNoteDataItem != null) {
+                menu.setHeaderTitle(mFocusNoteDataItem.getSnippet());
+                menu.add(0, MENU_FOLDER_VIEW, 0, R.string.menu_folder_view);
+                menu.add(0, MENU_FOLDER_DELETE, 0, R.string.menu_folder_delete);
+                menu.add(0, MENU_FOLDER_CHANGE_NAME, 0, R.string.menu_folder_change_name);
+            }
+        }
+    };
+
+    @Override
+    public void onContextMenuClosed(Menu menu) {
+        if (mNotesListView != null) {
+            mNotesListView.setOnCreateContextMenuListener(null);
+        }
+        super.onContextMenuClosed(menu);
+    }
+
+    @Override
+    public boolean onContextItemSelected(MenuItem item) {
+        if (mFocusNoteDataItem == null) {
+            Log.e(TAG, "The long click data item is null");
+            return false;
+        }
+        switch (item.getItemId()) {
+            case MENU_FOLDER_VIEW:
+                openFolder(mFocusNoteDataItem);
+                break;
+            case MENU_FOLDER_DELETE:
+                AlertDialog.Builder builder = new AlertDialog.Builder(this);
+                builder.setTitle(getString(R.string.alert_title_delete));
+                builder.setIcon(android.R.drawable.ic_dialog_alert);
+                builder.setMessage(getString(R.string.alert_message_delete_folder));
+                builder.setPositiveButton(android.R.string.ok,
+                        new DialogInterface.OnClickListener() {
+                            public void onClick(DialogInterface dialog, int which) {
+                                deleteFolder(mFocusNoteDataItem.getId());
+                            }
+                        });
+                builder.setNegativeButton(android.R.string.cancel, null);
+                builder.show();
+                break;
+            case MENU_FOLDER_CHANGE_NAME:
+                showCreateOrModifyFolderDialog(false);
+                break;
+            default:
+                break;
+        }
+
+        return true;
+    }
+
+    @Override
+    public boolean onPrepareOptionsMenu(Menu menu) {
+        menu.clear();
+        if (mState == ListEditState.NOTE_LIST) {
+            getMenuInflater().inflate(R.menu.note_list, menu);
+            // set sync or sync_cancel
+            menu.findItem(R.id.menu_sync).setTitle(
+                    GTaskSyncService.isSyncing() ? R.string.menu_sync_cancel : R.string.menu_sync);
+        } else if (mState == ListEditState.SUB_FOLDER) {
+            getMenuInflater().inflate(R.menu.sub_folder, menu);
+        } else if (mState == ListEditState.CALL_RECORD_FOLDER) {
+            getMenuInflater().inflate(R.menu.call_record_folder, menu);
+        } else {
+            Log.e(TAG, "Wrong state:" + mState);
+        }
+        return true;
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        switch (item.getItemId()) {
+            case R.id.menu_new_folder: {
+                showCreateOrModifyFolderDialog(true);
+                break;
+            }
+            case R.id.menu_export_text: {
+                exportNoteToText();
+                break;
+            }
+            case R.id.menu_sync: {
+                if (isSyncMode()) {
+                    if (TextUtils.equals(item.getTitle(), getString(R.string.menu_sync))) {
+                        GTaskSyncService.startSync(this);
+                    } else {
+                        GTaskSyncService.cancelSync(this);
+                    }
+                } else {
+                    startPreferenceActivity();
+                }
+                break;
+            }
+            case R.id.menu_setting: {
+                startPreferenceActivity();
+                break;
+            }
+            case R.id.menu_new_note: {
+                createNewNote();
+                break;
+            }
+            case R.id.menu_search:
+                onSearchRequested();
+                break;
+            default:
+                break;
+        }
+        return true;
+    }
+
+    @Override
+    public boolean onSearchRequested() {
+        startSearch(null, false, null /* appData */, false);
+        return true;
+    }
+
+    private void exportNoteToText() {
+        final BackupUtils backup = BackupUtils.getInstance(NotesListActivity.this);
+        new AsyncTask<Void, Void, Integer>() {
+
+            @Override
+            protected Integer doInBackground(Void... unused) {
+                return backup.exportToText();
+            }
+
+            @Override
+            protected void onPostExecute(Integer result) {
+                if (result == BackupUtils.STATE_SD_CARD_UNMOUONTED) {
+                    AlertDialog.Builder builder = new AlertDialog.Builder(NotesListActivity.this);
+                    builder.setTitle(NotesListActivity.this
+                            .getString(R.string.failed_sdcard_export));
+                    builder.setMessage(NotesListActivity.this
+                            .getString(R.string.error_sdcard_unmounted));
+                    builder.setPositiveButton(android.R.string.ok, null);
+                    builder.show();
+                } else if (result == BackupUtils.STATE_SUCCESS) {
+                    AlertDialog.Builder builder = new AlertDialog.Builder(NotesListActivity.this);
+                    builder.setTitle(NotesListActivity.this
+                            .getString(R.string.success_sdcard_export));
+                    builder.setMessage(NotesListActivity.this.getString(
+                            R.string.format_exported_file_location, backup
+                                    .getExportedTextFileName(), backup.getExportedTextFileDir()));
+                    builder.setPositiveButton(android.R.string.ok, null);
+                    builder.show();
+                } else if (result == BackupUtils.STATE_SYSTEM_ERROR) {
+                    AlertDialog.Builder builder = new AlertDialog.Builder(NotesListActivity.this);
+                    builder.setTitle(NotesListActivity.this
+                            .getString(R.string.failed_sdcard_export));
+                    builder.setMessage(NotesListActivity.this
+                            .getString(R.string.error_sdcard_export));
+                    builder.setPositiveButton(android.R.string.ok, null);
+                    builder.show();
+                }
+            }
+
+        }.execute();
+    }
+
+    private boolean isSyncMode() {
+        return NotesPreferenceActivity.getSyncAccountName(this).trim().length() > 0;
+    }
+
+    private void startPreferenceActivity() {
+        Activity from = getParent() != null ? getParent() : this;
+        Intent intent = new Intent(from, NotesPreferenceActivity.class);
+        from.startActivityIfNeeded(intent, -1);
+    }
+
+    private class OnListItemClickListener implements OnItemClickListener {
+
+        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
+            if (view instanceof NotesListItem) {
+                NoteItemData item = ((NotesListItem) view).getItemData();
+                if (mNotesListAdapter.isInChoiceMode()) {
+                    if (item.getType() == Notes.TYPE_NOTE) {
+                        position = position - mNotesListView.getHeaderViewsCount();
+                        mModeCallBack.onItemCheckedStateChanged(null, position, id,
+                                !mNotesListAdapter.isSelectedItem(position));
+                    }
+                    return;
+                }
+
+                switch (mState) {
+                    case NOTE_LIST:
+                        if (item.getType() == Notes.TYPE_FOLDER
+                                || item.getType() == Notes.TYPE_SYSTEM) {
+                            openFolder(item);
+                        } else if (item.getType() == Notes.TYPE_NOTE) {
+                            openNode(item);
+                        } else {
+                            Log.e(TAG, "Wrong note type in NOTE_LIST");
+                        }
+                        break;
+                    case SUB_FOLDER:
+                    case CALL_RECORD_FOLDER:
+                        if (item.getType() == Notes.TYPE_NOTE) {
+                            openNode(item);
+                        } else {
+                            Log.e(TAG, "Wrong note type in SUB_FOLDER");
+                        }
+                        break;
+                    default:
+                        break;
+                }
+            }
+        }
+
+    }
+
+    private void startQueryDestinationFolders() {
+        String selection = NoteColumns.TYPE + "=? AND " + NoteColumns.PARENT_ID + "<>? AND " + NoteColumns.ID + "<>?";
+        selection = (mState == ListEditState.NOTE_LIST) ? selection:
+            "(" + selection + ") OR (" + NoteColumns.ID + "=" + Notes.ID_ROOT_FOLDER + ")";
+
+        mBackgroundQueryHandler.startQuery(FOLDER_LIST_QUERY_TOKEN,
+                null,
+                Notes.CONTENT_NOTE_URI,
+                FoldersListAdapter.PROJECTION,
+                selection,
+                new String[] {
+                        String.valueOf(Notes.TYPE_FOLDER),
+                        String.valueOf(Notes.ID_TRASH_FOLER),
+                        String.valueOf(mCurrentFolderId)
+                },
+                NoteColumns.MODIFIED_DATE + " DESC");
+    }
+
+    public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
+        if (view instanceof NotesListItem) {
+            mFocusNoteDataItem = ((NotesListItem) view).getItemData();
+            if (mFocusNoteDataItem.getType() == Notes.TYPE_NOTE && !mNotesListAdapter.isInChoiceMode()) {
+                if (mNotesListView.startActionMode(mModeCallBack) != null) {
+                    mModeCallBack.onItemCheckedStateChanged(null, position, id, true);
+                    mNotesListView.performHapticFeedback(HapticFeedbackConstants.LONG_PRESS);
+                } else {
+                    Log.e(TAG, "startActionMode fails");
+                }
+            } else if (mFocusNoteDataItem.getType() == Notes.TYPE_FOLDER) {
+                mNotesListView.setOnCreateContextMenuListener(mFolderOnCreateContextMenuListener);
+            }
+        }
+        return false;
+    }
+}

src/net/micode/notes/ui/NotesListAdapter-note.java

@@ -0,0 +1,182 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui; // 定义包名
+
+import android.content.Context; // 导入Context类
+import android.database.Cursor; // 导入Cursor类
+import android.util.Log; // 导入Log类
+import android.view.View; // 导入View类
+import android.view.ViewGroup; // 导入ViewGroup类
+import android.widget.CursorAdapter; // 导入CursorAdapter类
+
+import net.micode.notes.data.Notes; // 导入Notes数据类
+
+import java.util.Collection; // 导入Collection接口
+import java.util.HashMap; // 导入HashMap类
+import java.util.HashSet; // 导入HashSet类
+import java.util.Iterator; // 导入Iterator接口
+
+public class NotesListAdapter extends CursorAdapter { // 定义 NotesListAdapter 类，继承自 CursorAdapter
+    private static final String TAG = "NotesListAdapter"; // 日志标签
+
+    private Context mContext; // 上下文
+    private HashMap<Integer, Boolean> mSelectedIndex; // 用于记录选择状态的哈希映射
+    private int mNotesCount; // 笔记数量
+    private boolean mChoiceMode; // 选择模式标志
+
+    public static class AppWidgetAttribute { // 定义内部类 AppWidgetAttribute，用于存储小部件的属性
+        public int widgetId; // 小部件ID
+        public int widgetType; // 小部件类型
+    };
+
+    public NotesListAdapter(Context context) { // 构造函数
+        super(context, null); // 调用父类构造函数
+        mSelectedIndex = new HashMap<Integer, Boolean>(); // 初始化选择索引映射
+        mContext = context; // 设置上下文
+        mNotesCount = 0; // 初始化笔记数量为0
+    }
+
+    @Override
+    public View newView(Context context, Cursor cursor, ViewGroup parent) { // 创建新视图的方法
+        return new NotesListItem(context); // 返回新的NotesListItem实例
+    }
+
+    @Override
+    public void bindView(View view, Context context, Cursor cursor) { // 绑定视图与数据的方法
+        if (view instanceof NotesListItem) { // 检查视图类型
+            NoteItemData itemData = new NoteItemData(context, cursor); // 创建NoteItemData对象
+            ((NotesListItem) view).bind(context, itemData, mChoiceMode, // 绑定数据到视图
+                    isSelectedItem(cursor.getPosition())); // 传递当前项是否被选中的状态
+        }
+    }
+
+    public void setCheckedItem(final int position, final boolean checked) { // 设置某项的选择状态
+        mSelectedIndex.put(position, checked); // 更新选择状态
+        notifyDataSetChanged(); // 通知数据变化，更新视图
+    }
+
+    public boolean isInChoiceMode() { // 判断是否处于选择模式
+        return mChoiceMode; // 返回选择模式状态
+    }
+
+    public void setChoiceMode(boolean mode) { // 设置选择模式
+        mSelectedIndex.clear(); // 清除之前的选择状态
+        mChoiceMode = mode; // 更新选择模式状态
+    }
+
+    public void selectAll(boolean checked) { // 全选或取消全选的方法
+        Cursor cursor = getCursor(); // 获取当前游标
+        for (int i = 0; i < getCount(); i++) { // 遍历所有项
+            if (cursor.moveToPosition(i)) { // 移动游标到指定位置
+                if (NoteItemData.getNoteType(cursor) == Notes.TYPE_NOTE) { // 如果项的类型为笔记
+                    setCheckedItem(i, checked); // 设置选择状态
+                }
+            }
+        }
+    }
+
+    public HashSet<Long> getSelectedItemIds() { // 获取选中项ID集合
+        HashSet<Long> itemSet = new HashSet<Long>(); // 创建ID集合
+        for (Integer position : mSelectedIndex.keySet()) { // 遍历选择索引
+            if (mSelectedIndex.get(position) == true) { // 如果该项被选中
+                Long id = getItemId(position); // 获取对应的ID
+                if (id == Notes.ID_ROOT_FOLDER) { // 如果是根文件夹ID
+                    Log.d(TAG, "Wrong item id, should not happen"); // 日志输出错误信息
+                } else {
+                    itemSet.add(id); // 添加ID到集合
+                }
+            }
+        }
+
+        return itemSet; // 返回ID集合
+    }
+
+    public HashSet<AppWidgetAttribute> getSelectedWidget() { // 获取选中小部件的方法
+        HashSet<AppWidgetAttribute> itemSet = new HashSet<AppWidgetAttribute>(); // 创建小部件属性集合
+        for (Integer position : mSelectedIndex.keySet()) { // 遍历选择索引
+            if (mSelectedIndex.get(position) == true) { // 如果该项被选中
+                Cursor c = (Cursor) getItem(position); // 获取相应游标
+                if (c != null) { // 如果游标不为空
+                    AppWidgetAttribute widget = new AppWidgetAttribute(); // 创建小部件属性对象
+                    NoteItemData item = new NoteItemData(mContext, c); // 创建笔记数据项
+                    widget.widgetId = item.getWidgetId(); // 获取小部件ID
+                    widget.widgetType = item.getWidgetType(); // 获取小部件类型
+                    itemSet.add(widget); // 将小部件属性添加到集合
+                    // 不要在这里关闭游标，只有适配器可以关闭它
+                } else {
+                    Log.e(TAG, "Invalid cursor"); // 日志输出错误信息
+                    return null; // 返回null
+                }
+            }
+        }
+        return itemSet; // 返回小部件属性集合
+    }
+
+    public int getSelectedCount() { // 获取选中项数量的方法
+        Collection<Boolean> values = mSelectedIndex.values(); // 获取所有选择状态
+        if (null == values) { // 如果值为空
+            return 0; // 返回0
+        }
+        Iterator<Boolean> iter = values.iterator(); // 创建迭代器
+        int count = 0; // 初始化计数器
+        while (iter.hasNext()) { // 遍历选择状态
+            if (true == iter.next()) { // 如果选中
+                count++; // 增加计数
+            }
+        }
+        return count; // 返回选中数量
+    }
+
+    public boolean isAllSelected() { // 判断是否全部选中
+        int checkedCount = getSelectedCount(); // 获取已选中项数量
+        return (checkedCount != 0 && checkedCount == mNotesCount); // 如果已选数量不为0并且与总数量相等，返回true
+    }
+
+    public boolean isSelectedItem(final int position) { // 判断指定项是否被选中
+        if (null == mSelectedIndex.get(position)) { // 如果没有该项的选择状态
+            return false; // 返回false
+        }
+        return mSelectedIndex.get(position); // 返回该项的选择状态
+    }
+
+    @Override
+    protected void onContentChanged() { // 当内容发生变化时调用
+        super.onContentChanged(); // 调用父类方法
+        calcNotesCount(); // 计算笔记数量
+    }
+
+    @Override
+    public void changeCursor(Cursor cursor) { // 更改游标的方法
+        super.changeCursor(cursor); // 调用父类方法
+        calcNotesCount(); // 计算笔记数量
+    }
+
+    private void calcNotesCount() { // 计算笔记数量的方法
+        mNotesCount = 0; // 初始化数量
+        for (int i = 0; i < getCount(); i++) { // 遍历所有项目
+            Cursor c = (Cursor) getItem(i); // 获取当前项目的游标
+            if (c != null) { // 如果游标不为空
+                if (NoteItemData.getNoteType(c) == Notes.TYPE_NOTE) { // 如果游标类型为笔记
+                    mNotesCount++; // 增加计数
+                }
+            } else {
+                Log.e(TAG, "Invalid cursor"); // 日志输出错误信息
+                return; // 返回
+            }
+        }
+    }
+}

src/net/micode/notes/ui/NotesListAdapter.java

@@ -0,0 +1,184 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui;
+
+import android.content.Context;
+import android.database.Cursor;
+import android.util.Log;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.CursorAdapter;
+
+import net.micode.notes.data.Notes;
+
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Iterator;
+
+
+public class NotesListAdapter extends CursorAdapter {
+    private static final String TAG = "NotesListAdapter";
+    private Context mContext;
+    private HashMap<Integer, Boolean> mSelectedIndex;
+    private int mNotesCount;
+    private boolean mChoiceMode;
+
+    public static class AppWidgetAttribute {
+        public int widgetId;
+        public int widgetType;
+    };
+
+    public NotesListAdapter(Context context) {
+        super(context, null);
+        mSelectedIndex = new HashMap<Integer, Boolean>();
+        mContext = context;
+        mNotesCount = 0;
+    }
+
+    @Override
+    public View newView(Context context, Cursor cursor, ViewGroup parent) {
+        return new NotesListItem(context);
+    }
+
+    @Override
+    public void bindView(View view, Context context, Cursor cursor) {
+        if (view instanceof NotesListItem) {
+            NoteItemData itemData = new NoteItemData(context, cursor);
+            ((NotesListItem) view).bind(context, itemData, mChoiceMode,
+                    isSelectedItem(cursor.getPosition()));
+        }
+    }
+
+    public void setCheckedItem(final int position, final boolean checked) {
+        mSelectedIndex.put(position, checked);
+        notifyDataSetChanged();
+    }
+
+    public boolean isInChoiceMode() {
+        return mChoiceMode;
+    }
+
+    public void setChoiceMode(boolean mode) {
+        mSelectedIndex.clear();
+        mChoiceMode = mode;
+    }
+
+    public void selectAll(boolean checked) {
+        Cursor cursor = getCursor();
+        for (int i = 0; i < getCount(); i++) {
+            if (cursor.moveToPosition(i)) {
+                if (NoteItemData.getNoteType(cursor) == Notes.TYPE_NOTE) {
+                    setCheckedItem(i, checked);
+                }
+            }
+        }
+    }
+
+    public HashSet<Long> getSelectedItemIds() {
+        HashSet<Long> itemSet = new HashSet<Long>();
+        for (Integer position : mSelectedIndex.keySet()) {
+            if (mSelectedIndex.get(position) == true) {
+                Long id = getItemId(position);
+                if (id == Notes.ID_ROOT_FOLDER) {
+                    Log.d(TAG, "Wrong item id, should not happen");
+                } else {
+                    itemSet.add(id);
+                }
+            }
+        }
+
+        return itemSet;
+    }
+
+    public HashSet<AppWidgetAttribute> getSelectedWidget() {
+        HashSet<AppWidgetAttribute> itemSet = new HashSet<AppWidgetAttribute>();
+        for (Integer position : mSelectedIndex.keySet()) {
+            if (mSelectedIndex.get(position) == true) {
+                Cursor c = (Cursor) getItem(position);
+                if (c != null) {
+                    AppWidgetAttribute widget = new AppWidgetAttribute();
+                    NoteItemData item = new NoteItemData(mContext, c);
+                    widget.widgetId = item.getWidgetId();
+                    widget.widgetType = item.getWidgetType();
+                    itemSet.add(widget);
+                    /**
+                     * Don't close cursor here, only the adapter could close it
+                     */
+                } else {
+                    Log.e(TAG, "Invalid cursor");
+                    return null;
+                }
+            }
+        }
+        return itemSet;
+    }
+
+    public int getSelectedCount() {
+        Collection<Boolean> values = mSelectedIndex.values();
+        if (null == values) {
+            return 0;
+        }
+        Iterator<Boolean> iter = values.iterator();
+        int count = 0;
+        while (iter.hasNext()) {
+            if (true == iter.next()) {
+                count++;
+            }
+        }
+        return count;
+    }
+
+    public boolean isAllSelected() {
+        int checkedCount = getSelectedCount();
+        return (checkedCount != 0 && checkedCount == mNotesCount);
+    }
+
+    public boolean isSelectedItem(final int position) {
+        if (null == mSelectedIndex.get(position)) {
+            return false;
+        }
+        return mSelectedIndex.get(position);
+    }
+
+    @Override
+    protected void onContentChanged() {
+        super.onContentChanged();
+        calcNotesCount();
+    }
+
+    @Override
+    public void changeCursor(Cursor cursor) {
+        super.changeCursor(cursor);
+        calcNotesCount();
+    }
+
+    private void calcNotesCount() {
+        mNotesCount = 0;
+        for (int i = 0; i < getCount(); i++) {
+            Cursor c = (Cursor) getItem(i);
+            if (c != null) {
+                if (NoteItemData.getNoteType(c) == Notes.TYPE_NOTE) {
+                    mNotesCount++;
+                }
+            } else {
+                Log.e(TAG, "Invalid cursor");
+                return;
+            }
+        }
+    }
+}

src/net/micode/notes/ui/NotesListItem-note.java

@@ -0,0 +1,121 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui; // 定义包名
+
+import android.content.Context; // 导入Context类
+import android.text.format.DateUtils; // 导入DateUtils类
+import android.view.View; // 导入View类
+import android.widget.CheckBox; // 导入CheckBox类
+import android.widget.ImageView; // 导入ImageView类
+import android.widget.LinearLayout; // 导入LinearLayout类
+import android.widget.TextView; // 导入TextView类
+
+import net.micode.notes.R; // 导入资源类
+import net.micode.notes.data.Notes; // 导入Notes数据类
+import net.micode.notes.tool.DataUtils; // 导入数据工具类
+import net.micode.notes.tool.ResourceParser.NoteItemBgResources; // 导入背景资源解析工具类
+
+public class NotesListItem extends LinearLayout { // 定义NotesListItem类，继承自LinearLayout
+    private ImageView mAlert; // 警报图标
+    private TextView mTitle; // 笔记标题文本视图
+    private TextView mTime; // 笔记时间文本视图
+    private TextView mCallName; // 通话记录名称文本视图
+    private NoteItemData mItemData; // 当前笔记数据项
+    private CheckBox mCheckBox; // 复选框
+
+    public NotesListItem(Context context) { // 构造函数
+        super(context); // 调用父类构造函数
+        inflate(context, R.layout.note_item, this); // 加载布局文件
+        mAlert = (ImageView) findViewById(R.id.iv_alert_icon); // 查找警报图标
+        mTitle = (TextView) findViewById(R.id.tv_title); // 查找笔记标题文本视图
+        mTime = (TextView) findViewById(R.id.tv_time); // 查找笔记时间文本视图
+        mCallName = (TextView) findViewById(R.id.tv_name); // 查找通话记录名称文本视图
+        mCheckBox = (CheckBox) findViewById(android.R.id.checkbox); // 查找复选框
+    }
+
+    public void bind(Context context, NoteItemData data, boolean choiceMode, boolean checked) { // 绑定视图与数据的方法
+        if (choiceMode && data.getType() == Notes.TYPE_NOTE) { // 如果在选择模式且项数据类型为笔记
+            mCheckBox.setVisibility(View.VISIBLE); // 显示复选框
+            mCheckBox.setChecked(checked); // 设置复选框的选中状态
+        } else {
+            mCheckBox.setVisibility(View.GONE); // 隐藏复选框
+        }
+
+        mItemData = data; // 赋值笔记数据项
+        if (data.getId() == Notes.ID_CALL_RECORD_FOLDER) { // 如果是通话记录文件夹
+            mCallName.setVisibility(View.GONE); // 隐藏通话记录名称
+            mAlert.setVisibility(View.VISIBLE); // 显示警报图标
+            mTitle.setTextAppearance(context, R.style.TextAppearancePrimaryItem); // 设置标题文本外观
+            mTitle.setText(context.getString(R.string.call_record_folder_name) // 设置标题文本
+                    + context.getString(R.string.format_folder_files_count, data.getNotesCount())); // 显示通话记录文件夹名称和数量
+            mAlert.setImageResource(R.drawable.call_record); // 设置警报图标为通话记录图标
+        } else if (data.getParentId() == Notes.ID_CALL_RECORD_FOLDER) { // 如果父级ID为通话记录文件夹
+            mCallName.setVisibility(View.VISIBLE); // 显示通话记录名称
+            mCallName.setText(data.getCallName()); // 设置通话记录名称文本
+            mTitle.setTextAppearance(context,R.style.TextAppearanceSecondaryItem); // 设置标题文本外观为次要样式
+            mTitle.setText(DataUtils.getFormattedSnippet(data.getSnippet())); // 设置标题文本为摘要
+            if (data.hasAlert()) { // 如果有警报
+                mAlert.setImageResource(R.drawable.clock); // 设置警报图标为时钟
+                mAlert.setVisibility(View.VISIBLE); // 显示警报图标
+            } else {
+                mAlert.setVisibility(View.GONE); // 隐藏警报图标
+            }
+        } else { // 如果不是通话记录文件夹
+            mCallName.setVisibility(View.GONE); // 隐藏通话记录名称
+            mTitle.setTextAppearance(context, R.style.TextAppearancePrimaryItem); // 设置标题文本外观为主要样式
+
+            if (data.getType() == Notes.TYPE_FOLDER) { // 如果数据类型为文件夹
+                mTitle.setText(data.getSnippet() // 设置标题为文件夹摘要和文件夹中的笔记数量
+                        + context.getString(R.string.format_folder_files_count,
+                                data.getNotesCount()));
+                mAlert.setVisibility(View.GONE); // 隐藏警报图标
+            } else { // 如果是笔记类型
+                mTitle.setText(DataUtils.getFormattedSnippet(data.getSnippet())); // 设置标题为摘要
+                if (data.hasAlert()) { // 如果有警报
+                    mAlert.setImageResource(R.drawable.clock); // 设置警报图标为时钟
+                    mAlert.setVisibility(View.VISIBLE); // 显示警报图标
+                } else {
+                    mAlert.setVisibility(View.GONE); // 隐藏警报图标
+                }
+            }
+        }
+        mTime.setText(DateUtils.getRelativeTimeSpanString(data.getModifiedDate())); // 设置文本视图为相对时间格式的修改日期
+
+        setBackground(data); // 设置背景
+    }
+
+    private void setBackground(NoteItemData data) { // 设置背景的方法
+        int id = data.getBgColorId(); // 获取背景颜色ID
+        if (data.getType() == Notes.TYPE_NOTE) { // 如果是笔记类型
+            if (data.isSingle() || data.isOneFollowingFolder()) { // 如果是唯一笔记或文件夹下唯一笔记
+                setBackgroundResource(NoteItemBgResources.getNoteBgSingleRes(id)); // 设置为单个笔记的背景资源
+            } else if (data.isLast()) { // 如果为最后一项
+                setBackgroundResource(NoteItemBgResources.getNoteBgLastRes(id)); // 设置为最后一项的背景资源
+            } else if (data.isFirst() || data.isMultiFollowingFolder()) { // 如果为第一项或多个笔记在文件夹下
+                setBackgroundResource(NoteItemBgResources.getNoteBgFirstRes(id)); // 设置为第一项的背景资源
+            } else {
+                setBackgroundResource(NoteItemBgResources.getNoteBgNormalRes(id)); // 设置为正常背景资源
+            }
+        } else { // 如果不是笔记类型
+            setBackgroundResource(NoteItemBgResources.getFolderBgRes()); // 设置为文件夹背景资源
+        }
+    }
+
+    public NoteItemData getItemData() { // 获取当前笔记项数据
+        return mItemData; // 返回笔记项数据
+    }
+}

src/net/micode/notes/ui/NotesListItem.java

@@ -0,0 +1,122 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui;
+
+import android.content.Context;
+import android.text.format.DateUtils;
+import android.view.View;
+import android.widget.CheckBox;
+import android.widget.ImageView;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+
+import net.micode.notes.R;
+import net.micode.notes.data.Notes;
+import net.micode.notes.tool.DataUtils;
+import net.micode.notes.tool.ResourceParser.NoteItemBgResources;
+
+
+public class NotesListItem extends LinearLayout {
+    private ImageView mAlert;
+    private TextView mTitle;
+    private TextView mTime;
+    private TextView mCallName;
+    private NoteItemData mItemData;
+    private CheckBox mCheckBox;
+
+    public NotesListItem(Context context) {
+        super(context);
+        inflate(context, R.layout.note_item, this);
+        mAlert = (ImageView) findViewById(R.id.iv_alert_icon);
+        mTitle = (TextView) findViewById(R.id.tv_title);
+        mTime = (TextView) findViewById(R.id.tv_time);
+        mCallName = (TextView) findViewById(R.id.tv_name);
+        mCheckBox = (CheckBox) findViewById(android.R.id.checkbox);
+    }
+
+    public void bind(Context context, NoteItemData data, boolean choiceMode, boolean checked) {
+        if (choiceMode && data.getType() == Notes.TYPE_NOTE) {
+            mCheckBox.setVisibility(View.VISIBLE);
+            mCheckBox.setChecked(checked);
+        } else {
+            mCheckBox.setVisibility(View.GONE);
+        }
+
+        mItemData = data;
+        if (data.getId() == Notes.ID_CALL_RECORD_FOLDER) {
+            mCallName.setVisibility(View.GONE);
+            mAlert.setVisibility(View.VISIBLE);
+            mTitle.setTextAppearance(context, R.style.TextAppearancePrimaryItem);
+            mTitle.setText(context.getString(R.string.call_record_folder_name)
+                    + context.getString(R.string.format_folder_files_count, data.getNotesCount()));
+            mAlert.setImageResource(R.drawable.call_record);
+        } else if (data.getParentId() == Notes.ID_CALL_RECORD_FOLDER) {
+            mCallName.setVisibility(View.VISIBLE);
+            mCallName.setText(data.getCallName());
+            mTitle.setTextAppearance(context,R.style.TextAppearanceSecondaryItem);
+            mTitle.setText(DataUtils.getFormattedSnippet(data.getSnippet()));
+            if (data.hasAlert()) {
+                mAlert.setImageResource(R.drawable.clock);
+                mAlert.setVisibility(View.VISIBLE);
+            } else {
+                mAlert.setVisibility(View.GONE);
+            }
+        } else {
+            mCallName.setVisibility(View.GONE);
+            mTitle.setTextAppearance(context, R.style.TextAppearancePrimaryItem);
+
+            if (data.getType() == Notes.TYPE_FOLDER) {
+                mTitle.setText(data.getSnippet()
+                        + context.getString(R.string.format_folder_files_count,
+                                data.getNotesCount()));
+                mAlert.setVisibility(View.GONE);
+            } else {
+                mTitle.setText(DataUtils.getFormattedSnippet(data.getSnippet()));
+                if (data.hasAlert()) {
+                    mAlert.setImageResource(R.drawable.clock);
+                    mAlert.setVisibility(View.VISIBLE);
+                } else {
+                    mAlert.setVisibility(View.GONE);
+                }
+            }
+        }
+        mTime.setText(DateUtils.getRelativeTimeSpanString(data.getModifiedDate()));
+
+        setBackground(data);
+    }
+
+    private void setBackground(NoteItemData data) {
+        int id = data.getBgColorId();
+        if (data.getType() == Notes.TYPE_NOTE) {
+            if (data.isSingle() || data.isOneFollowingFolder()) {
+                setBackgroundResource(NoteItemBgResources.getNoteBgSingleRes(id));
+            } else if (data.isLast()) {
+                setBackgroundResource(NoteItemBgResources.getNoteBgLastRes(id));
+            } else if (data.isFirst() || data.isMultiFollowingFolder()) {
+                setBackgroundResource(NoteItemBgResources.getNoteBgFirstRes(id));
+            } else {
+                setBackgroundResource(NoteItemBgResources.getNoteBgNormalRes(id));
+            }
+        } else {
+            setBackgroundResource(NoteItemBgResources.getFolderBgRes());
+        }
+    }
+
+    public NoteItemData getItemData() {
+        return mItemData;
+    }
+}

src/net/micode/notes/ui/NotesPreferenceActivity-note.java

@@ -0,0 +1,528 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui;
+// 指定当前类的包名，属于net.micode.notes.ui的模块。
+import android.accounts.Account;
+// 导入Android账户类，用于获取和管理用户账户。
+import android.accounts.AccountManager;
+// 导入Android账户管理器类，负责账户的操作。
+import android.app.ActionBar;
+// 导入Android的ActionBar类，用于支持应用显示顶部的导航栏。
+import android.app.AlertDialog;
+// 导入Android的AlertDialog类，用于创建对话框。
+import android.content.BroadcastReceiver;
+// 导入Android的BroadcastReceiver类，用于接收广播。
+import android.content.ContentValues;
+// 导入Android的ContentValues类，用于存储数据库中待插入或更新的值。
+import android.content.Context;
+// 导入Android的Context类，用于访问应用程序的环境信息。
+import android.content.DialogInterface;
+// 导入Android的DialogInterface类，用于处理对话框响应的接口。
+import android.content.Intent;
+// 导入Android的Intent类，用于在组件之间传递信息。
+import android.content.IntentFilter;
+// 导入Android的IntentFilter类，用于定义接收特定广播的过滤条件。
+import android.content.SharedPreferences;
+// 导入Android的SharedPreferences类，用于访问应用程序的持久化偏好设置。
+import android.os.Bundle;
+// 导入Android的Bundle类，用于保存活动状态信息。
+import android.preference.Preference;
+// 导入Android的Preference类，表示持久化的偏好设置。
+import android.preference.Preference.OnPreferenceClickListener;
+// 导入Android的OnPreferenceClickListener接口，用于处理偏好设置项的点击事件。
+import android.preference.PreferenceActivity;
+// 导入Android的PreferenceActivity类，用于显示偏好设置界面。
+import android.preference.PreferenceCategory;
+// 导入Android的PreferenceCategory类，表示一组相关的偏好设置。
+import android.text.TextUtils;
+// 导入Android的TextUtils工具类，提供字符串处理方法。
+import android.text.format.DateFormat;
+// 导入Android的DateFormat类，用于日期格式化。
+import android.view.LayoutInflater;
+// 导入Android的LayoutInflater类，用于将XML布局文件转换为View对象。
+import android.view.Menu;
+// 导入Android的Menu类，用于创建菜单。
+import android.view.MenuItem;
+// 导入Android的MenuItem类，表示菜单中的各个项。
+import android.view.View;
+// 导入Android的View类，表示视觉组件。
+import android.widget.Button;
+// 导入Android的Button类，表示按钮组件。
+import android.widget.TextView;
+// 导入Android的TextView类，表示文本视图组件。
+import android.widget.Toast;
+// 导入Android的Toast类，用于显示短暂的消息。
+import net.micode.notes.R;
+// 导入自定义资源文件R，用于获取应用内的资源（如字符串、布局等）。
+import net.micode.notes.data.Notes;
+// 导入笔记数据相关的类。
+import net.micode.notes.data.Notes.NoteColumns;
+// 导入笔记数据的列定义。
+import net.micode.notes.gtask.remote.GTaskSyncService;
+// 导入GTask同步服务，用于管理数据同步过程。
+public class NotesPreferenceActivity extends PreferenceActivity {
+// 定义一个名为NotesPreferenceActivity的公共类，继承自PreferenceActivity
+// 这是用于管理笔记应用的偏好设置界面。
+    public static final String PREFERENCE_NAME = "notes_preferences";
+// 声明偏好设置文件的名称常量。
+    public static final String PREFERENCE_SYNC_ACCOUNT_NAME = "pref_key_account_name";
+// 声明用于存储同步账户名称的偏好键的常量。
+    public static final String PREFERENCE_LAST_SYNC_TIME = "pref_last_sync_time";
+// 声明用于存储最后同步时间的偏好键的常量。
+    public static final String PREFERENCE_SET_BG_COLOR_KEY = "pref_key_bg_random_appear";
+// 声明用于存储背景颜色随机出现选项的偏好键的常量。
+    private static final String PREFERENCE_SYNC_ACCOUNT_KEY = "pref_sync_account_key";
+// 声明用于存储同步账户的偏好键的常量。
+    private static final String AUTHORITIES_FILTER_KEY = "authorities";
+// 声明用于过滤账户权限的键的常量。
+    private PreferenceCategory mAccountCategory;
+// 声明变量，表示账户类别的偏好设置。
+    private GTaskReceiver mReceiver;
+// 声明广播接收器变量，用于接收和处理同步相关的广播。
+    private Account[] mOriAccounts;
+// 声明变量，存储原始账户信息的数组。
+    private boolean mHasAddedAccount;
+// 声明布尔变量，用于标识用户是否已经添加了新账户。
+    @Override
+    protected void onCreate(Bundle icicle) {
+    // 重写onCreate方法，当活动被创建时调用。
+        super.onCreate(icicle);
+        // 调用父类的onCreate方法。
+
+        /* using the app icon for navigation */
+        getActionBar().setDisplayHomeAsUpEnabled(true);
+        // 设置ActionBar支持返回导航（向上导航）。
+        addPreferencesFromResource(R.xml.preferences);
+        // 从XML资源文件加载应用的偏好设置。
+        mAccountCategory = (PreferenceCategory) findPreference(PREFERENCE_SYNC_ACCOUNT_KEY);
+        // 找到并初始化用于显示账户的偏好设置类别。
+        mReceiver = new GTaskReceiver();
+        // 创建GTaskReceiver的实例，处理同步相关的广播。
+        IntentFilter filter = new IntentFilter();
+        // 创建意图过滤器，用于注册监听特定的广播。
+        filter.addAction(GTaskSyncService.GTASK_SERVICE_BROADCAST_NAME);
+        // 为过滤器添加要监听的广播动作，即GTask服务的广播。
+        registerReceiver(mReceiver, filter);
+        // 注册接收器，开始监听同步服务的广播。
+        mOriAccounts = null;
+        // 初始化原始账户数组为空。
+        View header = LayoutInflater.from(this).inflate(R.layout.settings_header, null);
+        // 从XML文件加载设置界面的表头视图。
+        getListView().addHeaderView(header, null, true);
+        // 将表头添加到偏好设置列表视图中。
+    }
+    @Override
+    protected void onResume() {
+    super.onResume();
+    // 生命周期方法：当活动恢复时调用。
+
+        // need to set sync account automatically if user has added a new account
+        if (mHasAddedAccount) {
+            // 如果用户添加了新账户，则自动设置同步账户。
+            Account[] accounts = getGoogleAccounts();
+            // 获取当前Google账户列表。
+            if (mOriAccounts != null && accounts.length > mOriAccounts.length) {
+                // 如果原始账户不为空且新账户数量大于原账户数量
+                for (Account accountNew : accounts) {
+                    // 遍历新账户。
+                    boolean found = false;
+                    // 标识是否找到匹配账户。
+
+                    for (Account accountOld : mOriAccounts) {
+                        // 遍历原始账户。
+                        if (TextUtils.equals(accountOld.name, accountNew.name)) {
+                            // 如果找到了相同的账户名。
+                            found = true;
+                            break;
+                        }
+                    }
+                    if (!found) {
+                        // 如果没有找到相同的账户。
+                        setSyncAccount(accountNew.name);
+                        // 设置新账户为同步账户。
+                        break;
+                    }
+                }
+            }
+        }
+
+        refreshUI();
+        // 刷新用户界面以显示最新的账户和状态信息。
+    }
+    @Override
+    protected void onDestroy() {
+        if (mReceiver != null) {
+            unregisterReceiver(mReceiver);
+            // 如果接收器不为空，取消注册，以避免内存泄漏。
+        }
+        super.onDestroy();
+        // 调用父类的onDestroy方法。
+    }
+    private void loadAccountPreference() {
+    // 加载账户偏好设置的方法。
+        mAccountCategory.removeAll();
+        // 移除账户类别中的所有偏好设置项。
+
+        Preference accountPref = new Preference(this);
+        // 创建新的偏好设置项，用于显示账户信息。
+        final String defaultAccount = getSyncAccountName(this);
+        // 获取当前同步账户的名称。
+        
+        accountPref.setTitle(getString(R.string.preferences_account_title));
+        // 设置偏好设置项的标题。
+        accountPref.setSummary(getString(R.string.preferences_account_summary));
+        // 设置偏好设置项的摘要描述。
+        accountPref.setOnPreferenceClickListener(new OnPreferenceClickListener() {
+            public boolean onPreferenceClick(Preference preference) {
+                if (!GTaskSyncService.isSyncing()) {
+                    // 如果当前没有进行同步操作。
+                    if (TextUtils.isEmpty(defaultAccount)) {
+                        // 如果当前没有默认账户。
+                        showSelectAccountAlertDialog();
+                        // 显示选择账户的对话框。
+                    } else {
+                        // 如果已有默认账户。
+                        showChangeAccountConfirmAlertDialog();
+                        // 显示更改账户的确认对话框。
+                    }
+                } else {
+                    Toast.makeText(NotesPreferenceActivity.this,
+                            R.string.preferences_toast_cannot_change_account, Toast.LENGTH_SHORT)
+                            .show();
+                    // 提示用户正在同步时无法更改账户。
+                }
+                return true; // 表示事件已处理。
+            }
+        });
+
+        mAccountCategory.addPreference(accountPref);
+        // 将创建的账户偏好设置项添加到账户类别中。
+
+    }
+    private void loadSyncButton() {
+        // 加载同步按钮的方法。
+        Button syncButton = (Button) findViewById(R.id.preference_sync_button);
+        // 获取用于同步的按钮实例。
+        TextView lastSyncTimeView = (TextView) findViewById(R.id.prefenerece_sync_status_textview);
+        // 获取用于显示最后同步时间的文本视图。
+
+        // set button state
+        if (GTaskSyncService.isSyncing()) {
+            // 如果当前正在进行同步。
+            syncButton.setText(getString(R.string.preferences_button_sync_cancel));
+            // 设置按钮文本为“取消同步”。
+            syncButton.setOnClickListener(new View.OnClickListener() {
+                public void onClick(View v) {
+                    GTaskSyncService.cancelSync(NotesPreferenceActivity.this);
+                    // 点击按钮时取消正在进行的同步。
+                }
+            });
+        } else {
+            syncButton.setText(getString(R.string.preferences_button_sync_immediately));
+            // 设置按钮文本为“立即同步”。
+            syncButton.setOnClickListener(new View.OnClickListener() {
+                public void onClick(View v) {
+                    GTaskSyncService.startSync(NotesPreferenceActivity.this);
+                    // 点击按钮时开始同步。
+                }
+            });
+        }
+        
+        syncButton.setEnabled(!TextUtils.isEmpty(getSyncAccountName(this)));
+        // 如果同步账户不为空，则启用按钮。
+
+        // set last sync time
+        if (GTaskSyncService.isSyncing()) {
+            // 如果正在同步。
+            lastSyncTimeView.setText(GTaskSyncService.getProgressString());
+            // 设置文本视图的文本为当前同步的进度信息。
+            lastSyncTimeView.setVisibility(View.VISIBLE);
+        } else {
+            long lastSyncTime = getLastSyncTime(this);
+            // 获取最后同步时间。
+            if (lastSyncTime != 0) {
+                lastSyncTimeView.setText(getString(R.string.preferences_last_sync_time,
+                        DateFormat.format(getString(R.string.preferences_last_sync_time_format),
+                                lastSyncTime)));
+                // 设置文本视图的文本为最后同步的时间格式化字符串。
+                lastSyncTimeView.setVisibility(View.VISIBLE);
+            } else {
+                lastSyncTimeView.setVisibility(View.GONE);
+                // 如果没有最后同步时间，则隐藏文本视图。
+            }
+        }
+    }
+    private void refreshUI() {
+        // 刷新用户界面的方法。
+        loadAccountPreference();
+        // 重新加载账户偏好设置项。
+        loadSyncButton();
+        // 重新加载同步按钮。
+    }
+    private void showSelectAccountAlertDialog() {
+        // 显示选择账户的对话框的方法。
+        AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);
+        // 创建对话框构建器。
+
+        View titleView = LayoutInflater.from(this).inflate(R.layout.account_dialog_title, null);
+        // 从XML布局文件加载自定义对话框标题视图。
+        TextView titleTextView = (TextView) titleView.findViewById(R.id.account_dialog_title);
+        titleTextView.setText(getString(R.string.preferences_dialog_select_account_title));
+        // 设置对话框标题的文本。
+        TextView subtitleTextView = (TextView) titleView.findViewById(R.id.account_dialog_subtitle);
+        subtitleTextView.setText(getString(R.string.preferences_dialog_select_account_tips));
+        // 设置对话框副标题的文本。
+
+        dialogBuilder.setCustomTitle(titleView);
+        // 设置对话框的自定义标题。
+        dialogBuilder.setPositiveButton(null, null);
+        // 设置正面按钮为空，因后续不需要使用。
+
+        Account[] accounts = getGoogleAccounts();
+        // 获取所有Google账户。
+        String defAccount = getSyncAccountName(this);
+        // 获取当前同步账户的名称。
+
+        mOriAccounts = accounts;
+        // 存储原始账户。
+        mHasAddedAccount = false;
+        // 重置添加账户的标记。
+
+        if (accounts.length > 0) {
+            // 如果有可用账户。
+            CharSequence[] items = new CharSequence[accounts.length];
+            // 创建可选账户名称的字符序列数组。
+            final CharSequence[] itemMapping = items;
+            int checkedItem = -1;
+            // 记录当前选中账户的索引。
+            int index = 0;
+            for (Account account : accounts) {
+                if (TextUtils.equals(account.name, defAccount)) {
+                    checkedItem = index;
+                    // 如果当前账户是同步账户，则记录索引。
+                }
+                items[index++] = account.name;
+                // 将账户名称添加到字符序列数组。
+            }
+            dialogBuilder.setSingleChoiceItems(items, checkedItem,
+                    new DialogInterface.OnClickListener() {
+                        public void onClick(DialogInterface dialog, int which) {
+                            setSyncAccount(itemMapping[which].toString());
+                            // 设置选中的账户作为同步账户。
+                            dialog.dismiss();
+                            // 关闭对话框。
+                            refreshUI();
+                            // 刷新用户界面以更新账户信息。
+                        }
+                    });
+        }
+
+        View addAccountView = LayoutInflater.from(this).inflate(R.layout.add_account_text, null);
+        // 加载添加账户的视图。
+        dialogBuilder.setView(addAccountView);
+        // 将添加账户视图设置为对话框内容。
+
+        final AlertDialog dialog = dialogBuilder.show();
+        // 显示对话框。
+
+        addAccountView.setOnClickListener(new View.OnClickListener() {
+            public void onClick(View v) {
+                mHasAddedAccount = true;
+                // 设置标记为账户已被添加。
+                Intent intent = new Intent("android.settings.ADD_ACCOUNT_SETTINGS");
+                // 创建意图以跳转到添加账户设置界面。
+                intent.putExtra(AUTHORITIES_FILTER_KEY, new String[] {
+                    "gmail-ls"
+                });
+                // 设置过滤器以限制账户类型为 GMail。
+                startActivityForResult(intent, -1);
+                // 启动账户添加设置界面。
+                dialog.dismiss();
+                // 关闭对话框。
+            }
+        });
+    }
+    private void showChangeAccountConfirmAlertDialog() {
+        // 显示更改账户确认对话框的方法。
+        AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);
+        // 创建对话框构建器。
+
+        View titleView = LayoutInflater.from(this).inflate(R.layout.account_dialog_title, null);
+        // 从布局中加载自定义标题视图。
+        TextView titleTextView = (TextView) titleView.findViewById(R.id.account_dialog_title);
+        titleTextView.setText(getString(R.string.preferences_dialog_change_account_title,
+                getSyncAccountName(this)));
+        // 设置更改账户的标题。
+        TextView subtitleTextView = (TextView) titleView.findViewById(R.id.account_dialog_subtitle);
+        subtitleTextView.setText(getString(R.string.preferences_dialog_change_account_warn_msg));
+        // 设置警告消息的副标题。
+
+        dialogBuilder.setCustomTitle(titleView);
+        // 设置对话框的自定义标题。
+
+        CharSequence[] menuItemArray = new CharSequence[] {
+                getString(R.string.preferences_menu_change_account),
+                getString(R.string.preferences_menu_remove_account),
+                getString(R.string.preferences_menu_cancel)
+        };
+        // 定义菜单项数组，包含更改账户、移除账户和取消选项。
+
+        dialogBuilder.setItems(menuItemArray, new DialogInterface.OnClickListener() {
+            public void onClick(DialogInterface dialog, int which) {
+                if (which == 0) {
+                    showSelectAccountAlertDialog();
+                    // 如果选择更改账户，显示选择账户对话框。
+                } else if (which == 1) {
+                    removeSyncAccount();
+                    // 如果选择移除账户，调用移除账户方法。
+                    refreshUI();
+                    // 刷新UI以更新信息。
+                }
+            }
+        });
+        dialogBuilder.show();
+        // 显示对话框。
+    }
+    private Account[] getGoogleAccounts() {
+        AccountManager accountManager = AccountManager.get(this);
+        // 获取账户管理器实例。
+        return accountManager.getAccountsByType("com.google");
+        // 返回Google账户类型的账户数组。
+    }
+    private void setSyncAccount(String account) {
+        if (!getSyncAccountName(this).equals(account)) {
+            // 如果未选择到相同的账户。
+            SharedPreferences settings = getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);
+            // 获取偏好设置实例。
+            SharedPreferences.Editor editor = settings.edit();
+            // 获取编辑器，以便存储偏好值。
+            if (account != null) {
+                editor.putString(PREFERENCE_SYNC_ACCOUNT_NAME, account);
+                // 如果账户不为空，存储账户名。
+            } else {
+                editor.putString(PREFERENCE_SYNC_ACCOUNT_NAME, "");
+                // 如果账户为空，存储空字符串。
+            }
+            editor.commit();
+            // 提交编辑器的更改。
+
+            // clean up last sync time
+            setLastSyncTime(this, 0);
+            // 清除最后同步时间。
+
+            // clean up local gtask related info
+            new Thread(new Runnable() {
+                public void run() {
+                    ContentValues values = new ContentValues();
+                    values.put(NoteColumns.GTASK_ID, "");
+                    values.put(NoteColumns.SYNC_ID, 0);
+                    // 清空GTASK相关数据。
+                    getContentResolver().update(Notes.CONTENT_NOTE_URI, values, null, null);
+                    // 更新笔记中的相关内容。
+                }
+            }).start();
+
+            Toast.makeText(NotesPreferenceActivity.this,
+                    getString(R.string.preferences_toast_success_set_accout, account),
+                    Toast.LENGTH_SHORT).show();
+            // 显示成功设置账户的提示。
+        }
+    }
+    private void removeSyncAccount() {
+        SharedPreferences settings = getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);
+        // 获取偏好设置实例。
+        SharedPreferences.Editor editor = settings.edit();
+        // 获取编辑器。
+        if (settings.contains(PREFERENCE_SYNC_ACCOUNT_NAME)) {
+            editor.remove(PREFERENCE_SYNC_ACCOUNT_NAME);
+            // 如果偏好设置中包含同步账户名，移除它。
+        }
+        if (settings.contains(PREFERENCE_LAST_SYNC_TIME)) {
+            editor.remove(PREFERENCE_LAST_SYNC_TIME);
+            // 如果偏好设置中包含最后同步时间，移除它。
+        }
+        editor.commit();
+        // 提交编辑器的更改。
+
+        // clean up local gtask related info
+        new Thread(new Runnable() {
+            public void run() {
+                ContentValues values = new ContentValues();
+                values.put(NoteColumns.GTASK_ID, "");
+                values.put(NoteColumns.SYNC_ID, 0);
+                // 清空GTASK相关数据。
+                getContentResolver().update(Notes.CONTENT_NOTE_URI, values, null, null);
+                // 更新笔记中相关内容。
+            }
+        }).start();
+    }
+    public static String getSyncAccountName(Context context) {
+        SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME,
+                Context.MODE_PRIVATE);
+        // 获取偏好设置实例。
+        return settings.getString(PREFERENCE_SYNC_ACCOUNT_NAME, "");
+        // 返回当前同步账户名称，默认为空字符串。
+    }
+    public static void setLastSyncTime(Context context, long time) {
+        SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME,
+                Context.MODE_PRIVATE);
+        // 获取偏好设置实例。
+        SharedPreferences.Editor editor = settings.edit();
+        editor.putLong(PREFERENCE_LAST_SYNC_TIME, time);
+        // 存储最后同步时间。
+        editor.commit();
+        // 提交编辑器的更改。
+    }
+    public static long getLastSyncTime(Context context) {
+        SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME,
+                Context.MODE_PRIVATE);
+        // 获取偏好设置实例。
+        return settings.getLong(PREFERENCE_LAST_SYNC_TIME, 0);
+        // 返回最后同步时间，默认为0。
+    }
+    private class GTaskReceiver extends BroadcastReceiver {
+        // 定义GTaskReceiver类，用于接收同步服务的广播。
+
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            // 当接收到广播时调用。
+            refreshUI();
+            // 刷新UI以显示最新信息。
+            if (intent.getBooleanExtra(GTaskSyncService.GTASK_SERVICE_BROADCAST_IS_SYNCING, false)) {
+                TextView syncStatus = (TextView) findViewById(R.id.prefenerece_sync_status_textview);
+                // 获取显示同步状态的文本视图。
+                syncStatus.setText(intent
+                        .getStringExtra(GTaskSyncService.GTASK_SERVICE_BROADCAST_PROGRESS_MSG));
+                // 设置文本视图内容为同步进度信息。
+            }
+        }
+    }
+    public boolean onOptionsItemSelected(MenuItem item) {
+        switch (item.getItemId()) {
+            case android.R.id.home:
+                Intent intent = new Intent(this, NotesListActivity.class);
+                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
+                // 创建意图，跳转到笔记列表活动，并清除栈中的其它活动。
+                startActivity(intent);
+                // 启动活动。
+                return true;
+            default:
+                return false;
+            // 如果不是默认情形，返回false。
+        }
+    }
+}

src/net/micode/notes/ui/NotesPreferenceActivity.java

@@ -0,0 +1,388 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui;
+
+import android.accounts.Account;
+import android.accounts.AccountManager;
+import android.app.ActionBar;
+import android.app.AlertDialog;
+import android.content.BroadcastReceiver;
+import android.content.ContentValues;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.content.SharedPreferences;
+import android.os.Bundle;
+import android.preference.Preference;
+import android.preference.Preference.OnPreferenceClickListener;
+import android.preference.PreferenceActivity;
+import android.preference.PreferenceCategory;
+import android.text.TextUtils;
+import android.text.format.DateFormat;
+import android.view.LayoutInflater;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.view.View;
+import android.widget.Button;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import net.micode.notes.R;
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.NoteColumns;
+import net.micode.notes.gtask.remote.GTaskSyncService;
+
+
+public class NotesPreferenceActivity extends PreferenceActivity {
+    public static final String PREFERENCE_NAME = "notes_preferences";
+
+    public static final String PREFERENCE_SYNC_ACCOUNT_NAME = "pref_key_account_name";
+
+    public static final String PREFERENCE_LAST_SYNC_TIME = "pref_last_sync_time";
+
+    public static final String PREFERENCE_SET_BG_COLOR_KEY = "pref_key_bg_random_appear";
+
+    private static final String PREFERENCE_SYNC_ACCOUNT_KEY = "pref_sync_account_key";
+
+    private static final String AUTHORITIES_FILTER_KEY = "authorities";
+
+    private PreferenceCategory mAccountCategory;
+
+    private GTaskReceiver mReceiver;
+
+    private Account[] mOriAccounts;
+
+    private boolean mHasAddedAccount;
+
+    @Override
+    protected void onCreate(Bundle icicle) {
+        super.onCreate(icicle);
+
+        /* using the app icon for navigation */
+        getActionBar().setDisplayHomeAsUpEnabled(true);
+
+        addPreferencesFromResource(R.xml.preferences);
+        mAccountCategory = (PreferenceCategory) findPreference(PREFERENCE_SYNC_ACCOUNT_KEY);
+        mReceiver = new GTaskReceiver();
+        IntentFilter filter = new IntentFilter();
+        filter.addAction(GTaskSyncService.GTASK_SERVICE_BROADCAST_NAME);
+        registerReceiver(mReceiver, filter);
+
+        mOriAccounts = null;
+        View header = LayoutInflater.from(this).inflate(R.layout.settings_header, null);
+        getListView().addHeaderView(header, null, true);
+    }
+
+    @Override
+    protected void onResume() {
+        super.onResume();
+
+        // need to set sync account automatically if user has added a new
+        // account
+        if (mHasAddedAccount) {
+            Account[] accounts = getGoogleAccounts();
+            if (mOriAccounts != null && accounts.length > mOriAccounts.length) {
+                for (Account accountNew : accounts) {
+                    boolean found = false;
+                    for (Account accountOld : mOriAccounts) {
+                        if (TextUtils.equals(accountOld.name, accountNew.name)) {
+                            found = true;
+                            break;
+                        }
+                    }
+                    if (!found) {
+                        setSyncAccount(accountNew.name);
+                        break;
+                    }
+                }
+            }
+        }
+
+        refreshUI();
+    }
+
+    @Override
+    protected void onDestroy() {
+        if (mReceiver != null) {
+            unregisterReceiver(mReceiver);
+        }
+        super.onDestroy();
+    }
+
+    private void loadAccountPreference() {
+        mAccountCategory.removeAll();
+
+        Preference accountPref = new Preference(this);
+        final String defaultAccount = getSyncAccountName(this);
+        accountPref.setTitle(getString(R.string.preferences_account_title));
+        accountPref.setSummary(getString(R.string.preferences_account_summary));
+        accountPref.setOnPreferenceClickListener(new OnPreferenceClickListener() {
+            public boolean onPreferenceClick(Preference preference) {
+                if (!GTaskSyncService.isSyncing()) {
+                    if (TextUtils.isEmpty(defaultAccount)) {
+                        // the first time to set account
+                        showSelectAccountAlertDialog();
+                    } else {
+                        // if the account has already been set, we need to promp
+                        // user about the risk
+                        showChangeAccountConfirmAlertDialog();
+                    }
+                } else {
+                    Toast.makeText(NotesPreferenceActivity.this,
+                            R.string.preferences_toast_cannot_change_account, Toast.LENGTH_SHORT)
+                            .show();
+                }
+                return true;
+            }
+        });
+
+        mAccountCategory.addPreference(accountPref);
+    }
+
+    private void loadSyncButton() {
+        Button syncButton = (Button) findViewById(R.id.preference_sync_button);
+        TextView lastSyncTimeView = (TextView) findViewById(R.id.prefenerece_sync_status_textview);
+
+        // set button state
+        if (GTaskSyncService.isSyncing()) {
+            syncButton.setText(getString(R.string.preferences_button_sync_cancel));
+            syncButton.setOnClickListener(new View.OnClickListener() {
+                public void onClick(View v) {
+                    GTaskSyncService.cancelSync(NotesPreferenceActivity.this);
+                }
+            });
+        } else {
+            syncButton.setText(getString(R.string.preferences_button_sync_immediately));
+            syncButton.setOnClickListener(new View.OnClickListener() {
+                public void onClick(View v) {
+                    GTaskSyncService.startSync(NotesPreferenceActivity.this);
+                }
+            });
+        }
+        syncButton.setEnabled(!TextUtils.isEmpty(getSyncAccountName(this)));
+
+        // set last sync time
+        if (GTaskSyncService.isSyncing()) {
+            lastSyncTimeView.setText(GTaskSyncService.getProgressString());
+            lastSyncTimeView.setVisibility(View.VISIBLE);
+        } else {
+            long lastSyncTime = getLastSyncTime(this);
+            if (lastSyncTime != 0) {
+                lastSyncTimeView.setText(getString(R.string.preferences_last_sync_time,
+                        DateFormat.format(getString(R.string.preferences_last_sync_time_format),
+                                lastSyncTime)));
+                lastSyncTimeView.setVisibility(View.VISIBLE);
+            } else {
+                lastSyncTimeView.setVisibility(View.GONE);
+            }
+        }
+    }
+
+    private void refreshUI() {
+        loadAccountPreference();
+        loadSyncButton();
+    }
+
+    private void showSelectAccountAlertDialog() {
+        AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);
+
+        View titleView = LayoutInflater.from(this).inflate(R.layout.account_dialog_title, null);
+        TextView titleTextView = (TextView) titleView.findViewById(R.id.account_dialog_title);
+        titleTextView.setText(getString(R.string.preferences_dialog_select_account_title));
+        TextView subtitleTextView = (TextView) titleView.findViewById(R.id.account_dialog_subtitle);
+        subtitleTextView.setText(getString(R.string.preferences_dialog_select_account_tips));
+
+        dialogBuilder.setCustomTitle(titleView);
+        dialogBuilder.setPositiveButton(null, null);
+
+        Account[] accounts = getGoogleAccounts();
+        String defAccount = getSyncAccountName(this);
+
+        mOriAccounts = accounts;
+        mHasAddedAccount = false;
+
+        if (accounts.length > 0) {
+            CharSequence[] items = new CharSequence[accounts.length];
+            final CharSequence[] itemMapping = items;
+            int checkedItem = -1;
+            int index = 0;
+            for (Account account : accounts) {
+                if (TextUtils.equals(account.name, defAccount)) {
+                    checkedItem = index;
+                }
+                items[index++] = account.name;
+            }
+            dialogBuilder.setSingleChoiceItems(items, checkedItem,
+                    new DialogInterface.OnClickListener() {
+                        public void onClick(DialogInterface dialog, int which) {
+                            setSyncAccount(itemMapping[which].toString());
+                            dialog.dismiss();
+                            refreshUI();
+                        }
+                    });
+        }
+
+        View addAccountView = LayoutInflater.from(this).inflate(R.layout.add_account_text, null);
+        dialogBuilder.setView(addAccountView);
+
+        final AlertDialog dialog = dialogBuilder.show();
+        addAccountView.setOnClickListener(new View.OnClickListener() {
+            public void onClick(View v) {
+                mHasAddedAccount = true;
+                Intent intent = new Intent("android.settings.ADD_ACCOUNT_SETTINGS");
+                intent.putExtra(AUTHORITIES_FILTER_KEY, new String[] {
+                    "gmail-ls"
+                });
+                startActivityForResult(intent, -1);
+                dialog.dismiss();
+            }
+        });
+    }
+
+    private void showChangeAccountConfirmAlertDialog() {
+        AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);
+
+        View titleView = LayoutInflater.from(this).inflate(R.layout.account_dialog_title, null);
+        TextView titleTextView = (TextView) titleView.findViewById(R.id.account_dialog_title);
+        titleTextView.setText(getString(R.string.preferences_dialog_change_account_title,
+                getSyncAccountName(this)));
+        TextView subtitleTextView = (TextView) titleView.findViewById(R.id.account_dialog_subtitle);
+        subtitleTextView.setText(getString(R.string.preferences_dialog_change_account_warn_msg));
+        dialogBuilder.setCustomTitle(titleView);
+
+        CharSequence[] menuItemArray = new CharSequence[] {
+                getString(R.string.preferences_menu_change_account),
+                getString(R.string.preferences_menu_remove_account),
+                getString(R.string.preferences_menu_cancel)
+        };
+        dialogBuilder.setItems(menuItemArray, new DialogInterface.OnClickListener() {
+            public void onClick(DialogInterface dialog, int which) {
+                if (which == 0) {
+                    showSelectAccountAlertDialog();
+                } else if (which == 1) {
+                    removeSyncAccount();
+                    refreshUI();
+                }
+            }
+        });
+        dialogBuilder.show();
+    }
+
+    private Account[] getGoogleAccounts() {
+        AccountManager accountManager = AccountManager.get(this);
+        return accountManager.getAccountsByType("com.google");
+    }
+
+    private void setSyncAccount(String account) {
+        if (!getSyncAccountName(this).equals(account)) {
+            SharedPreferences settings = getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);
+            SharedPreferences.Editor editor = settings.edit();
+            if (account != null) {
+                editor.putString(PREFERENCE_SYNC_ACCOUNT_NAME, account);
+            } else {
+                editor.putString(PREFERENCE_SYNC_ACCOUNT_NAME, "");
+            }
+            editor.commit();
+
+            // clean up last sync time
+            setLastSyncTime(this, 0);
+
+            // clean up local gtask related info
+            new Thread(new Runnable() {
+                public void run() {
+                    ContentValues values = new ContentValues();
+                    values.put(NoteColumns.GTASK_ID, "");
+                    values.put(NoteColumns.SYNC_ID, 0);
+                    getContentResolver().update(Notes.CONTENT_NOTE_URI, values, null, null);
+                }
+            }).start();
+
+            Toast.makeText(NotesPreferenceActivity.this,
+                    getString(R.string.preferences_toast_success_set_accout, account),
+                    Toast.LENGTH_SHORT).show();
+        }
+    }
+
+    private void removeSyncAccount() {
+        SharedPreferences settings = getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);
+        SharedPreferences.Editor editor = settings.edit();
+        if (settings.contains(PREFERENCE_SYNC_ACCOUNT_NAME)) {
+            editor.remove(PREFERENCE_SYNC_ACCOUNT_NAME);
+        }
+        if (settings.contains(PREFERENCE_LAST_SYNC_TIME)) {
+            editor.remove(PREFERENCE_LAST_SYNC_TIME);
+        }
+        editor.commit();
+
+        // clean up local gtask related info
+        new Thread(new Runnable() {
+            public void run() {
+                ContentValues values = new ContentValues();
+                values.put(NoteColumns.GTASK_ID, "");
+                values.put(NoteColumns.SYNC_ID, 0);
+                getContentResolver().update(Notes.CONTENT_NOTE_URI, values, null, null);
+            }
+        }).start();
+    }
+
+    public static String getSyncAccountName(Context context) {
+        SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME,
+                Context.MODE_PRIVATE);
+        return settings.getString(PREFERENCE_SYNC_ACCOUNT_NAME, "");
+    }
+
+    public static void setLastSyncTime(Context context, long time) {
+        SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME,
+                Context.MODE_PRIVATE);
+        SharedPreferences.Editor editor = settings.edit();
+        editor.putLong(PREFERENCE_LAST_SYNC_TIME, time);
+        editor.commit();
+    }
+
+    public static long getLastSyncTime(Context context) {
+        SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME,
+                Context.MODE_PRIVATE);
+        return settings.getLong(PREFERENCE_LAST_SYNC_TIME, 0);
+    }
+
+    private class GTaskReceiver extends BroadcastReceiver {
+
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            refreshUI();
+            if (intent.getBooleanExtra(GTaskSyncService.GTASK_SERVICE_BROADCAST_IS_SYNCING, false)) {
+                TextView syncStatus = (TextView) findViewById(R.id.prefenerece_sync_status_textview);
+                syncStatus.setText(intent
+                        .getStringExtra(GTaskSyncService.GTASK_SERVICE_BROADCAST_PROGRESS_MSG));
+            }
+
+        }
+    }
+
+    public boolean onOptionsItemSelected(MenuItem item) {
+        switch (item.getItemId()) {
+            case android.R.id.home:
+                Intent intent = new Intent(this, NotesListActivity.class);
+                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
+                startActivity(intent);
+                return true;
+            default:
+                return false;
+        }
+    }
+}

src/net/micode/notes/widget/NoteWidgetProvider.java

@@ -0,0 +1,132 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.widget;
+import android.app.PendingIntent;
+import android.appwidget.AppWidgetManager;
+import android.appwidget.AppWidgetProvider;
+import android.content.ContentValues;
+import android.content.Context;
+import android.content.Intent;
+import android.database.Cursor;
+import android.util.Log;
+import android.widget.RemoteViews;
+
+import net.micode.notes.R;
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.NoteColumns;
+import net.micode.notes.tool.ResourceParser;
+import net.micode.notes.ui.NoteEditActivity;
+import net.micode.notes.ui.NotesListActivity;
+
+public abstract class NoteWidgetProvider extends AppWidgetProvider {
+    public static final String [] PROJECTION = new String [] {
+        NoteColumns.ID,
+        NoteColumns.BG_COLOR_ID,
+        NoteColumns.SNIPPET
+    };
+
+    public static final int COLUMN_ID           = 0;
+    public static final int COLUMN_BG_COLOR_ID  = 1;
+    public static final int COLUMN_SNIPPET      = 2;
+
+    private static final String TAG = "NoteWidgetProvider";
+
+    @Override
+    public void onDeleted(Context context, int[] appWidgetIds) {
+        ContentValues values = new ContentValues();
+        values.put(NoteColumns.WIDGET_ID, AppWidgetManager.INVALID_APPWIDGET_ID);
+        for (int i = 0; i < appWidgetIds.length; i++) {
+            context.getContentResolver().update(Notes.CONTENT_NOTE_URI,
+                    values,
+                    NoteColumns.WIDGET_ID + "=?",
+                    new String[] { String.valueOf(appWidgetIds[i])});
+        }
+    }
+
+    private Cursor getNoteWidgetInfo(Context context, int widgetId) {
+        return context.getContentResolver().query(Notes.CONTENT_NOTE_URI,
+                PROJECTION,
+                NoteColumns.WIDGET_ID + "=? AND " + NoteColumns.PARENT_ID + "<>?",
+                new String[] { String.valueOf(widgetId), String.valueOf(Notes.ID_TRASH_FOLER) },
+                null);
+    }
+
+    protected void update(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
+        update(context, appWidgetManager, appWidgetIds, false);
+    }
+
+    private void update(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds,
+            boolean privacyMode) {
+        for (int i = 0; i < appWidgetIds.length; i++) {
+            if (appWidgetIds[i] != AppWidgetManager.INVALID_APPWIDGET_ID) {
+                int bgId = ResourceParser.getDefaultBgId(context);
+                String snippet = "";
+                Intent intent = new Intent(context, NoteEditActivity.class);
+                intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
+                intent.putExtra(Notes.INTENT_EXTRA_WIDGET_ID, appWidgetIds[i]);
+                intent.putExtra(Notes.INTENT_EXTRA_WIDGET_TYPE, getWidgetType());
+
+                Cursor c = getNoteWidgetInfo(context, appWidgetIds[i]);
+                if (c != null && c.moveToFirst()) {
+                    if (c.getCount() > 1) {
+                        Log.e(TAG, "Multiple message with same widget id:" + appWidgetIds[i]);
+                        c.close();
+                        return;
+                    }
+                    snippet = c.getString(COLUMN_SNIPPET);
+                    bgId = c.getInt(COLUMN_BG_COLOR_ID);
+                    intent.putExtra(Intent.EXTRA_UID, c.getLong(COLUMN_ID));
+                    intent.setAction(Intent.ACTION_VIEW);
+                } else {
+                    snippet = context.getResources().getString(R.string.widget_havenot_content);
+                    intent.setAction(Intent.ACTION_INSERT_OR_EDIT);
+                }
+
+                if (c != null) {
+                    c.close();
+                }
+
+                RemoteViews rv = new RemoteViews(context.getPackageName(), getLayoutId());
+                rv.setImageViewResource(R.id.widget_bg_image, getBgResourceId(bgId));
+                intent.putExtra(Notes.INTENT_EXTRA_BACKGROUND_ID, bgId);
+                /**
+                 * Generate the pending intent to start host for the widget
+                 */
+                PendingIntent pendingIntent = null;
+                if (privacyMode) {
+                    rv.setTextViewText(R.id.widget_text,
+                            context.getString(R.string.widget_under_visit_mode));
+                    pendingIntent = PendingIntent.getActivity(context, appWidgetIds[i], new Intent(
+                            context, NotesListActivity.class), PendingIntent.FLAG_UPDATE_CURRENT);
+                } else {
+                    rv.setTextViewText(R.id.widget_text, snippet);
+                    pendingIntent = PendingIntent.getActivity(context, appWidgetIds[i], intent,
+                            PendingIntent.FLAG_UPDATE_CURRENT);
+                }
+
+                rv.setOnClickPendingIntent(R.id.widget_text, pendingIntent);
+                appWidgetManager.updateAppWidget(appWidgetIds[i], rv);
+            }
+        }
+    }
+
+    protected abstract int getBgResourceId(int bgId);
+
+    protected abstract int getLayoutId();
+
+    protected abstract int getWidgetType();
+}

src/net/micode/notes/widget/NoteWidgetProvider_2x.java

@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.widget;
+
+import android.appwidget.AppWidgetManager;
+import android.content.Context;
+
+import net.micode.notes.R;
+import net.micode.notes.data.Notes;
+import net.micode.notes.tool.ResourceParser;
+
+
+public class NoteWidgetProvider_2x extends NoteWidgetProvider {
+    @Override
+    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
+        super.update(context, appWidgetManager, appWidgetIds);
+    }
+
+    @Override
+    protected int getLayoutId() {
+        return R.layout.widget_2x;
+    }
+
+    @Override
+    protected int getBgResourceId(int bgId) {
+        return ResourceParser.WidgetBgResources.getWidget2xBgResource(bgId);
+    }
+
+    @Override
+    protected int getWidgetType() {
+        return Notes.TYPE_WIDGET_2X;
+    }
+}

src/net/micode/notes/widget/NoteWidgetProvider_4x.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.widget;
+
+import android.appwidget.AppWidgetManager;
+import android.content.Context;
+
+import net.micode.notes.R;
+import net.micode.notes.data.Notes;
+import net.micode.notes.tool.ResourceParser;
+
+
+public class NoteWidgetProvider_4x extends NoteWidgetProvider {
+    @Override
+    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
+        super.update(context, appWidgetManager, appWidgetIds);
+    }
+
+    protected int getLayoutId() {
+        return R.layout.widget_4x;
+    }
+
+    @Override
+    protected int getBgResourceId(int bgId) {
+        return ResourceParser.WidgetBgResources.getWidget4xBgResource(bgId);
+    }
+
+    @Override
+    protected int getWidgetType() {
+        return Notes.TYPE_WIDGET_4X;
+    }
+}