diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/MainActivity.java b/src/Notes-master/app/src/main/java/net/micode/notes/MainActivity.java
new file mode 100644
index 0000000..8091753
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/net/micode/notes/MainActivity.java
@@ -0,0 +1,24 @@
+package net.micode.notes;
+
+import android.os.Bundle;
+
+import androidx.activity.EdgeToEdge;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.core.graphics.Insets;
+import androidx.core.view.ViewCompat;
+import androidx.core.view.WindowInsetsCompat;
+
+public class MainActivity extends AppCompatActivity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        EdgeToEdge.enable(this);
+        setContentView(R.layout.activity_main);
+        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) -> {
+            Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());
+            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
+            return insets;
+        });
+    }
+}
\ No newline at end of file
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/command/Command.java b/src/Notes-master/app/src/main/java/net/micode/notes/command/Command.java
new file mode 100644
index 0000000..1b353ff
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/net/micode/notes/command/Command.java
@@ -0,0 +1,22 @@
+/*
+ * 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.command;
+
+public interface Command {
+    void execute();
+    void undo();
+}
\ No newline at end of file
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/command/CommandManager.java b/src/Notes-master/app/src/main/java/net/micode/notes/command/CommandManager.java
new file mode 100644
index 0000000..7446e64
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/net/micode/notes/command/CommandManager.java
@@ -0,0 +1,64 @@
+/*
+ * 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.command;
+
+import java.util.Stack;
+
+public class CommandManager {
+    private Stack<Command> mUndoStack;
+    private Stack<Command> mRedoStack;
+
+    public CommandManager() {
+        mUndoStack = new Stack<>();
+        mRedoStack = new Stack<>();
+    }
+
+    public void executeCommand(Command command) {
+        command.execute();
+        mUndoStack.push(command);
+        mRedoStack.clear();
+    }
+
+    public boolean canUndo() {
+        return !mUndoStack.isEmpty();
+    }
+
+    public boolean canRedo() {
+        return !mRedoStack.isEmpty();
+    }
+
+    public void undo() {
+        if (canUndo()) {
+            Command command = mUndoStack.pop();
+            command.undo();
+            mRedoStack.push(command);
+        }
+    }
+
+    public void redo() {
+        if (canRedo()) {
+            Command command = mRedoStack.pop();
+            command.execute();
+            mUndoStack.push(command);
+        }
+    }
+
+    public void clear() {
+        mUndoStack.clear();
+        mRedoStack.clear();
+    }
+}
\ No newline at end of file
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/command/TextChangeCommand.java b/src/Notes-master/app/src/main/java/net/micode/notes/command/TextChangeCommand.java
new file mode 100644
index 0000000..7e140d2
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/net/micode/notes/command/TextChangeCommand.java
@@ -0,0 +1,41 @@
+/*
+ * 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.command;
+
+import net.micode.notes.model.WorkingNote;
+
+public class TextChangeCommand implements Command {
+    private WorkingNote mWorkingNote;
+    private String mOldText;
+    private String mNewText;
+
+    public TextChangeCommand(WorkingNote workingNote, String oldText, String newText) {
+        mWorkingNote = workingNote;
+        mOldText = oldText;
+        mNewText = newText;
+    }
+
+    @Override
+    public void execute() {
+        mWorkingNote.setWorkingText(mNewText);
+    }
+
+    @Override
+    public void undo() {
+        mWorkingNote.setWorkingText(mOldText);
+    }
+}
\ No newline at end of file
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/data/Contact.java b/src/Notes-master/app/src/main/java/net/micode/notes/data/Contact.java
new file mode 100644
index 0000000..9b857c8
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/net/micode/notes/data/Contact.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.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;
+
+    // 联系人查询工具类，根据手机号查询联系人名称
+    public class Contact {
+
+    private static HashMap<String, String> sContactCache;
+    // 日志标签常量，用于Android系统的日志记录机制
+    private static final String TAG = "Contact";
+    /*
+    * 查询单个联系人信息的SQL WHERE条件模板
+    *
+    * 功能说明：
+    * 1. 通过PHONE_NUMBERS_EQUAL函数进行电话号码智能匹配（支持格式化差异）
+    * 2. 限制查询结果为联系人电话记录类型（Phone.CONTENT_ITEM_TYPE）
+    * 3. 通过phone_lookup表的索引优化查询性能，使用最小匹配位数过滤
+    *
+    * 参数说明：
+    * - 第一个"?"：需要匹配的电话号码
+    * - 第二个"+"：最小匹配位数占位符，需在执行前替换为具体数值
+    *
+    * 使用注意：
+    * 1. 实际查询时需将"+"替换为具体的最小匹配位数（如7）
+    */
+    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 = '+')";
+
+    // 根据电话号码获取联系人信息，context为Android上下文，phoneNumber为要查询的电话号码
+    public static String getContact(Context context, String phoneNumber) {
+        // 延迟初始化创建缓存对象
+        if(sContactCache == null) {
+            sContactCache = new HashMap<String, String>();
+        }
+        // 缓存检查：如果已存在则直接返回
+        if(sContactCache.containsKey(phoneNumber)) {
+            return sContactCache.get(phoneNumber);
+        }
+        // 构建查询条件：将模板中的占位符替换为实际的最小匹配位数
+        String selection = CALLER_ID_SELECTION.replace("+",
+                PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));
+        // 数据库查询结果的游标，需及时关闭避免内存泄漏
+        Cursor cursor = context.getContentResolver().query(
+                Data.CONTENT_URI,                     // 查询的联系人数据表URI
+                new String [] { Phone.DISPLAY_NAME }, // 要查询的列：只获取显示名称
+                selection,                            // 查询条件：最小匹配位数
+                new String[] { phoneNumber },         // 查询参数：具体的电话号码值
+                null);                                // 排序方式：null表示不指定排序
+
+        if (cursor != null && cursor.moveToFirst()) {
+            try {
+                String name = cursor.getString(0);
+                sContactCache.put(phoneNumber, name);         // 缓存查询结果，避免重复查询
+                return name;
+            } catch (IndexOutOfBoundsException e) {
+                // 记录数据读取异常：当Cursor超出范围时捕获
+                Log.e(TAG, " Cursor get string error " + e.toString());
+                return null;
+            } finally {
+                cursor.close(); // 必须关闭游标，防止内存泄漏
+            }
+        } else {
+            // 记录查询无结果情况：数据库中没有匹配的联系人记录
+            Log.d(TAG, "No contact matched with number:" + phoneNumber);
+            return null;
+        }
+    }
+}
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/data/Notes.java b/src/Notes-master/app/src/main/java/net/micode/notes/data/Notes.java
new file mode 100644
index 0000000..aa45a7d
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/net/micode/notes/data/Notes.java
@@ -0,0 +1,310 @@
+/*
+ * 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";// 内容提供者的授权机构，用于构建URI
+    public static final String TAG = "Notes";             // 日志标签，用于调试和日志输出
+    public static final int TYPE_NOTE     = 0;            // 表示便签类型，用于区分数据条目
+    public static final int TYPE_FOLDER   = 1;            // 表示文件夹类型，用于组织便签
+    public static final int TYPE_SYSTEM   = 2;            // 表示系统文件夹类型，如根目录或回收站
+
+    /**
+     * 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";// 传递提醒日期的键
+    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");
+    /**
+     * 定义便签表的列名，用于数据库查询和更新。
+     * 注意事项：字段类型遵循SQLite规范，修改需同步数据库模式。
+     */
+    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";
+
+        /**
+         * Pinned date for note
+         * <P> Type: INTEGER (long) </P>
+         */
+        public static final String PINNED_DATE = "pinned_date";
+
+        /**
+         * Password encrypted flag
+         * <P> Type: INTEGER (1:encrypted, 0:unencrypted) </P>
+         */
+        public static final String PASSWORD_ENCRYPTED = "password_encrypted";
+
+        /**
+         * Password hash value
+         * <P> Type: TEXT </P>
+         */
+        public static final String PASSWORD_HASH = "password_hash";
+
+        /**
+         * Password salt value
+         * <P> Type: TEXT </P>
+         */
+        public static final String PASSWORD_SALT = "password_salt";
+    }
+    /**
+     * 定义便签数据表的列名，存储便签的具体内容（如文本或通话记录）。
+     * 注意事项：MIME_TYPE字段用于区分数据类型，如文本便签或通话便签。
+     */
+    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");
+    }
+}
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/data/NotesDatabaseHelper.java b/src/Notes-master/app/src/main/java/net/micode/notes/data/NotesDatabaseHelper.java
new file mode 100644
index 0000000..cede19c
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/net/micode/notes/data/NotesDatabaseHelper.java
@@ -0,0 +1,391 @@
+/*
+ * 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 = 7;
+
+    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," +
+                    NoteColumns.PINNED_DATE + " INTEGER NOT NULL DEFAULT 0," +
+                    NoteColumns.PASSWORD_ENCRYPTED + " INTEGER NOT NULL DEFAULT 0," +
+                    NoteColumns.PASSWORD_HASH + " TEXT NOT NULL DEFAULT ''," +
+                    NoteColumns.PASSWORD_SALT + " TEXT NOT NULL DEFAULT ''" +
+                    ")";
+
+    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 + "=CASE WHEN new." + DataColumns.DATA3 + " != '' THEN new." + DataColumns.DATA3 + " ELSE new." + DataColumns.CONTENT + " END" +
+                    "  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 + "=CASE WHEN new." + DataColumns.DATA3 + " != '' THEN new." + DataColumns.DATA3 + " ELSE new." + DataColumns.CONTENT + " END" +
+                    "  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 (oldVersion == 4) {
+            // Recreate triggers to support title as snippet
+            reCreateNoteTableTriggers(db);
+            reCreateDataTableTriggers(db);
+            oldVersion++;
+        }
+
+        if (oldVersion == 5) {
+            // Add pinned_date column for note
+            db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.PINNED_DATE
+                    + " INTEGER NOT NULL DEFAULT 0");
+            oldVersion++;
+        }
+
+        if (oldVersion == 6) {
+            // Add password-related columns for note
+            db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.PASSWORD_ENCRYPTED
+                    + " INTEGER NOT NULL DEFAULT 0");
+            db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.PASSWORD_HASH
+                    + " TEXT NOT NULL DEFAULT ''");
+            db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.PASSWORD_SALT
+                    + " TEXT NOT NULL DEFAULT ''");
+            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");
+    }
+}
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/data/NotesProvider.java b/src/Notes-master/app/src/main/java/net/micode/notes/data/NotesProvider.java
new file mode 100644
index 0000000..c82f07c
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/net/micode/notes/data/NotesProvider.java
@@ -0,0 +1,380 @@
+/*
+ * 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;
+
+/**
+ * 小米便签内容提供者，实现Android数据共享机制
+ *
+ * 核心功能：
+ * - 提供便签数据的CRUD操作接口
+ * - 支持搜索建议和全文检索功能
+ * - 管理数据变更通知，确保UI同步更新
+ *
+ * 设计原理：
+ * 基于ContentProvider架构，通过UriMatcher路由不同数据请求
+ * 使用数据库触发器维护数据一致性，自动处理关联更新
+ *
+ * 注意事项：
+ * 1. 系统文件夹（ID<0）受保护，不允许删除操作
+ * 2. 搜索功能自动排除回收站中的便签
+ * 3. 数据变更时会自动发送通知更新相关组件
+ *
+ * @see ContentProvider Android内容提供者基类
+ * @see UriMatcher URI匹配工具
+ */
+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;
+    /**
+     * 配置URI路由规则，将不同路径映射到对应的处理逻辑
+     * 注意事项：路径模式必须与客户端调用保持一致
+     */
+    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;
+    /**
+     * 便签片段搜索查询SQL，支持模糊匹配
+     * 业务规则：自动排除回收站中的便签，只搜索普通笔记类型
+     */
+    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;
+    }
+    /**
+     * 处理数据查询请求，支持多种查询类型
+     *
+     * 实现逻辑：
+     * - 根据URI类型路由到不同的查询逻辑
+     * - 搜索请求使用原始SQL实现模糊匹配
+     * - 设置数据变更监听，确保实时更新
+     *
+     * 注意事项：
+     * 1. 搜索建议URI会自动提取查询关键词
+     * 2. 搜索功能不支持自定义排序和投影
+     * 3. 查询结果会自动注册内容观察者
+     *
+     * @param uri 数据访问路径，决定查询类型
+     * @param projection 返回字段列表，null表示所有字段
+     * @param selection 查询条件，支持占位符
+     * @param selectionArgs 条件参数值
+     * @param sortOrder 排序规则
+     * @return 查询结果游标，可能为null
+     */
+    @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;
+    }
+    /**
+     * 插入新数据到便签或数据表
+     *
+     * 业务逻辑：
+     * - 分离便签主表和数据表的插入操作
+     * - 插入成功后发送数据变更通知
+     * - 返回新记录的URI地址
+     *
+     * 注意事项：
+     * 1. 数据表插入需要关联有效的便签ID
+     * 2. 插入操作会触发数据库触发器更新相关计数
+     * 3. 通知会发送到所有注册的观察者
+     */
+    @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);
+    }
+    /**
+     * 删除便签或数据记录
+     *
+     * 保护机制：
+     * - 系统文件夹（ID≤0）禁止删除操作
+     * - 删除操作有条件限制，防止误删
+     * - 删除后发送通知更新UI
+     *
+     * 注意事项：
+     * 1. 删除便签会级联删除关联数据（通过触发器）
+     * 2. 系统文件夹受特殊保护
+     * 3. 数据删除会影响便签内容显示
+     */
+    @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;
+    }
+    /**
+     * 解析并格式化查询条件，安全拼接SQL语句
+     * 防止SQL注入：使用参数化查询而非字符串拼接
+     */
+    private String parseSelection(String selection) {
+        return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : "");
+    }
+    /**
+     * 增加便签版本号，用于数据同步冲突检测
+     * 实现原理：直接执行SQL更新语句，避免对象映射开销
+     * 业务价值：版本控制支持多设备数据同步
+     */
+    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;
+    }
+
+}
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/gtask/data/MetaData.java b/src/Notes-master/app/src/main/java/net/micode/notes/gtask/data/MetaData.java
new file mode 100644
index 0000000..3a2050b
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/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");
+    }
+
+}
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/gtask/data/Node.java b/src/Notes-master/app/src/main/java/net/micode/notes/gtask/data/Node.java
new file mode 100644
index 0000000..63950e0
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/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;
+    }
+
+}
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/gtask/data/SqlData.java b/src/Notes-master/app/src/main/java/net/micode/notes/gtask/data/SqlData.java
new file mode 100644
index 0000000..d3ec3be
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/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;
+    }
+}
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/gtask/data/SqlNote.java b/src/Notes-master/app/src/main/java/net/micode/notes/gtask/data/SqlNote.java
new file mode 100644
index 0000000..79a4095
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/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;
+    }
+}
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/gtask/data/Task.java b/src/Notes-master/app/src/main/java/net/micode/notes/gtask/data/Task.java
new file mode 100644
index 0000000..6a19454
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/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;
+    }
+
+}
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/gtask/data/TaskList.java b/src/Notes-master/app/src/main/java/net/micode/notes/gtask/data/TaskList.java
new file mode 100644
index 0000000..4ea21c5
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/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;
+    }
+}
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/gtask/exception/ActionFailureException.java b/src/Notes-master/app/src/main/java/net/micode/notes/gtask/exception/ActionFailureException.java
new file mode 100644
index 0000000..15504be
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/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);
+    }
+}
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/gtask/exception/NetworkFailureException.java b/src/Notes-master/app/src/main/java/net/micode/notes/gtask/exception/NetworkFailureException.java
new file mode 100644
index 0000000..b08cfb1
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/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);
+    }
+}
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/gtask/remote/GTaskASyncTask.java b/src/Notes-master/app/src/main/java/net/micode/notes/gtask/remote/GTaskASyncTask.java
new file mode 100644
index 0000000..ce3b53b
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/net/micode/notes/gtask/remote/GTaskASyncTask.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.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) {
+        PendingIntent pendingIntent;
+        if (tickerId != R.string.ticker_success) {
+            pendingIntent = PendingIntent.getActivity(mContext, 0, new Intent(mContext,
+                    NotesPreferenceActivity.class), PendingIntent.FLAG_IMMUTABLE);
+        } else {
+            pendingIntent = PendingIntent.getActivity(mContext, 0, new Intent(mContext,
+                    NotesListActivity.class), PendingIntent.FLAG_IMMUTABLE);
+        }
+        Notification.Builder builder = new Notification.Builder(mContext)
+                .setAutoCancel(true)
+                .setContentTitle(mContext.getString(R.string.app_name))
+                .setContentText(content)
+                .setContentIntent(pendingIntent)
+                .setWhen(System.currentTimeMillis())
+                .setOngoing(true);
+        Notification notification=builder.getNotification();
+        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();
+        }
+    }
+}
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/gtask/remote/GTaskClient.java b/src/Notes-master/app/src/main/java/net/micode/notes/gtask/remote/GTaskClient.java
new file mode 100644
index 0000000..c67dfdf
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/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;
+    }
+}
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/gtask/remote/GTaskManager.java b/src/Notes-master/app/src/main/java/net/micode/notes/gtask/remote/GTaskManager.java
new file mode 100644
index 0000000..d2b4082
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/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;
+    }
+}
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/gtask/remote/GTaskSyncService.java b/src/Notes-master/app/src/main/java/net/micode/notes/gtask/remote/GTaskSyncService.java
new file mode 100644
index 0000000..cca36f7
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/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;
+    }
+}
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/model/Note.java b/src/Notes-master/app/src/main/java/net/micode/notes/model/Note.java
new file mode 100644
index 0000000..01525bb
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/net/micode/notes/model/Note.java
@@ -0,0 +1,319 @@
+/*
+ * 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.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;
+
+/**
+ * 便签数据模型类，封装便签的创建、更新和同步操作
+ *
+ * 核心职责：
+ * - 管理便签基本信息和内容数据的变更
+ * - 提供文本便签和通话记录便签的数据封装
+ * - 处理本地修改标记和同步逻辑
+ *
+ * 设计模式：
+ * 采用组合模式，内部NoteData类管理具体数据类型
+ * 使用ContentValues跟踪数据变更，避免直接数据库操作
+ *
+ * 注意事项：
+ * 1. 便签ID必须大于0，系统文件夹ID为负值
+ * 2. 数据修改会自动更新修改时间和本地修改标记
+ * 3. 同步操作采用批量处理提高性能
+ *
+ * @see ContentValues Android键值对数据容器
+ */
+public class Note {
+    private ContentValues mNoteDiffValues;
+    private NoteData mNoteData;
+    private static final String TAG = "Note";
+    /**
+     * Create a new note id for adding a new note to databases
+     */
+    public static synchronized long getNewNoteId(Context context, long folderId) {
+        // Create a new note in the database
+        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;
+    }
+    /**
+     * 默认构造函数，初始化数据存储结构
+     * 注意事项：新创建的Note对象不关联具体便签，需要手动设置数据
+     */
+    public Note() {
+        mNoteDiffValues = new ContentValues();
+        mNoteData = new NoteData();
+    }
+    /**
+     * 设置便签基础信息字段值
+     * 自动更新修改时间和本地修改标记
+     *
+     * @param key 字段名，对应NoteColumns中的常量
+     * @param value 字段值，字符串类型
+     */
+    public void setNoteValue(String key, String value) {
+        mNoteDiffValues.put(key, value);
+        mNoteDiffValues.put(NoteColumns.LOCAL_MODIFIED, 1);
+        mNoteDiffValues.put(NoteColumns.MODIFIED_DATE, System.currentTimeMillis());
+    }
+    /**
+     * 设置文本便签内容数据
+     * 用于普通文本便签的内容管理
+     *
+     * @param key 数据字段名
+     * @param value 文本内容值
+     */
+    public void setTextData(String key, String value) {
+        mNoteData.setTextData(key, value);
+    }
+
+    public void setTextDataId(long id) {
+        mNoteData.setTextDataId(id);
+    }
+
+    public long getTextDataId() {
+        return mNoteData.mTextDataId;
+    }
+
+    public void setCallDataId(long id) {
+        mNoteData.setCallDataId(id);
+    }
+
+    public void setCallData(String key, String value) {
+        mNoteData.setCallData(key, value);
+    }
+
+    public boolean isLocalModified() {
+        return mNoteDiffValues.size() > 0 || mNoteData.isLocalModified();
+    }
+
+    public boolean syncNote(Context context, long noteId) {
+        if (noteId <= 0) {
+            throw new IllegalArgumentException("Wrong note id:" + noteId);
+        }
+
+        if (!isLocalModified()) {
+            return true;
+        }
+
+        /**
+         * In theory, once data changed, the note should be updated on {@link NoteColumns#LOCAL_MODIFIED} and
+         * {@link NoteColumns#MODIFIED_DATE}. For data safety, though update note fails, we also update the
+         * note data info
+         */
+        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();
+
+        if (mNoteData.isLocalModified()
+                && (mNoteData.pushIntoContentResolver(context, noteId) == null)) {
+            return false;
+        }
+
+        return true;
+    }
+    /**
+     * 便签内容数据管理内部类，封装文本和通话记录数据操作
+     *
+     * 职责分离：
+     * - 管理文本便签数据的CRUD操作
+     * - 处理通话记录便签的特殊字段
+     * - 提供批量数据同步能力
+     *
+     * 设计优势：内部类可以访问外部类的修改标记，确保数据一致性
+     */
+    private class NoteData {
+        private long mTextDataId;
+
+        private ContentValues mTextDataValues;
+
+        private long mCallDataId;
+
+        private ContentValues mCallDataValues;
+
+        private static final String TAG = "NoteData";
+        /**
+         * 构造函数，初始化数据存储结构
+         */
+        public NoteData() {
+            mTextDataValues = new ContentValues();
+            mCallDataValues = new ContentValues();
+            mTextDataId = 0;
+            mCallDataId = 0;
+        }
+
+        boolean isLocalModified() {
+            return mTextDataValues.size() > 0 || mCallDataValues.size() > 0;
+        }
+        /**
+         * 设置文本数据记录ID，用于更新操作
+         * 注意事项：ID必须大于0，表示已存在的数据库记录
+         *
+         * @param id 文本数据记录ID
+         * @throws IllegalArgumentException ID无效时抛出
+         */
+        void setTextDataId(long id) {
+            if(id <= 0) {
+                throw new IllegalArgumentException("Text data id should larger than 0");
+            }
+            mTextDataId = id;
+        }
+
+        void setCallDataId(long id) {
+            if (id <= 0) {
+                throw new IllegalArgumentException("Call data id should larger than 0");
+            }
+            mCallDataId = id;
+        }
+        /**
+         * 设置通话记录数据，自动更新外部便签修改标记
+         * 设计模式：通过内部类更新外部类状态，保持一致性
+         */
+        void setCallData(String key, String value) {
+            mCallDataValues.put(key, value);
+            mNoteDiffValues.put(NoteColumns.LOCAL_MODIFIED, 1);
+            mNoteDiffValues.put(NoteColumns.MODIFIED_DATE, System.currentTimeMillis());
+        }
+
+        void setTextData(String key, String value) {
+            mTextDataValues.put(key, value);
+            mNoteDiffValues.put(NoteColumns.LOCAL_MODIFIED, 1);
+            mNoteDiffValues.put(NoteColumns.MODIFIED_DATE, System.currentTimeMillis());
+        }
+        /**
+         * 将内容数据推送到ContentResolver，处理插入和更新操作
+         *
+         * 实现策略：
+         * - 新数据（ID=0）执行插入操作，获取新ID
+         * - 现有数据（ID>0）执行更新操作，使用批量处理
+         * - 支持文本数据和通话记录数据的独立处理
+         *
+         * 性能优化：使用ContentProviderOperation批量操作减少数据库交互
+         *
+         * @param context 上下文对象
+         * @param noteId 关联的便签ID
+         * @return 操作结果的URI，null表示失败
+         */
+        Uri pushIntoContentResolver(Context context, long noteId) {
+            /**
+             * Check for safety
+             */
+            if (noteId <= 0) {
+                throw new IllegalArgumentException("Wrong note id:" + noteId);
+            }
+
+            ArrayList<ContentProviderOperation> operationList = new ArrayList<ContentProviderOperation>();
+            ContentProviderOperation.Builder builder = null;
+
+            if(mTextDataValues.size() > 0) {
+                mTextDataValues.put(DataColumns.NOTE_ID, noteId);
+                if (mTextDataId == 0) {
+                    mTextDataValues.put(DataColumns.MIME_TYPE, TextNote.CONTENT_ITEM_TYPE);
+                    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 {
+                    builder = ContentProviderOperation.newUpdate(ContentUris.withAppendedId(
+                            Notes.CONTENT_DATA_URI, mTextDataId));
+                    builder.withValues(mTextDataValues);
+                    operationList.add(builder.build());
+                }
+                mTextDataValues.clear();
+            }
+
+            if(mCallDataValues.size() > 0) {
+                mCallDataValues.put(DataColumns.NOTE_ID, noteId);
+                if (mCallDataId == 0) {
+                    mCallDataValues.put(DataColumns.MIME_TYPE, CallNote.CONTENT_ITEM_TYPE);
+                    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 {
+                    builder = ContentProviderOperation.newUpdate(ContentUris.withAppendedId(
+                            Notes.CONTENT_DATA_URI, mCallDataId));
+                    builder.withValues(mCallDataValues);
+                    operationList.add(builder.build());
+                }
+                mCallDataValues.clear();
+            }
+
+            if (operationList.size() > 0) {
+                try {
+                    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(), e.getMessage()));
+                    return null;
+                } catch (OperationApplicationException e) {
+                    Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));
+                    return null;
+                }
+            }
+            return null;
+        }
+    }
+}
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/model/WorkingNote.java b/src/Notes-master/app/src/main/java/net/micode/notes/model/WorkingNote.java
new file mode 100644
index 0000000..0b777bc
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/net/micode/notes/model/WorkingNote.java
@@ -0,0 +1,470 @@
+/*
+ * 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 title
+    private String mTitle;
+    // 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,
+            NoteColumns.PASSWORD_ENCRYPTED,
+            NoteColumns.PASSWORD_HASH,
+            NoteColumns.PASSWORD_SALT
+    };
+
+    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 DATA_DATA3_COLUMN = 5;
+
+    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;
+    private static final int NOTE_PASSWORD_ENCRYPTED_COLUMN = 6;
+    private static final int NOTE_PASSWORD_HASH_COLUMN = 7;
+    private static final int NOTE_PASSWORD_SALT_COLUMN = 8;
+
+    // Password related fields
+    private boolean mPasswordEncrypted;
+    private String mPasswordHash;
+    private String mPasswordSalt;
+
+    // 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;
+        mTitle = "";
+        mPasswordEncrypted = false;
+        mPasswordHash = "";
+        mPasswordSalt = "";
+    }
+
+    // Existing note construct
+    private WorkingNote(Context context, long noteId, long folderId) {
+        mContext = context;
+        mNoteId = noteId;
+        mFolderId = folderId;
+        mIsDeleted = false;
+        mNote = new Note();
+        mPasswordEncrypted = false;
+        mPasswordHash = "";
+        mPasswordSalt = "";
+        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);
+                mPasswordEncrypted = cursor.getInt(NOTE_PASSWORD_ENCRYPTED_COLUMN) == 1;
+                mPasswordHash = cursor.getString(NOTE_PASSWORD_HASH_COLUMN);
+                mPasswordSalt = cursor.getString(NOTE_PASSWORD_SALT_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);
+                        mTitle = cursor.getString(DATA_DATA3_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) && TextUtils.isEmpty(mTitle))
+                || (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 setTitle(String title) {
+        if (!TextUtils.equals(mTitle, title)) {
+            mTitle = title;
+            mNote.setTextData(DataColumns.DATA3, mTitle);
+        }
+    }
+
+    public String getTitle() {
+        return mTitle;
+    }
+
+    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;
+    }
+
+    /**
+     * 检查便签是否包含图片
+     * @return true表示包含图片，false表示不包含
+     */
+    public boolean hasImage() {
+        return mContent != null && mContent.contains("[image:");
+    }
+
+    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);
+    }
+
+    /**
+     * 设置密码
+     * @param password 密码
+     * @return 是否设置成功
+     */
+    public boolean setPassword(String password) {
+        try {
+            if (net.micode.notes.tool.PasswordUtils.isValidPasswordFormat(password)) {
+                mPasswordSalt = net.micode.notes.tool.PasswordUtils.generateSalt();
+                mPasswordHash = net.micode.notes.tool.PasswordUtils.generatePasswordHash(password, mPasswordSalt);
+                mPasswordEncrypted = true;
+                mNote.setNoteValue(NoteColumns.PASSWORD_ENCRYPTED, "1");
+                mNote.setNoteValue(NoteColumns.PASSWORD_HASH, mPasswordHash);
+                mNote.setNoteValue(NoteColumns.PASSWORD_SALT, mPasswordSalt);
+                return true;
+            }
+        } catch (Exception e) {
+            Log.e(TAG, "Set password failed", e);
+        }
+        return false;
+    }
+
+    /**
+     * 验证密码
+     * @param password 待验证的密码
+     * @return 密码是否正确
+     */
+    public boolean verifyPassword(String password) {
+        try {
+            if (mPasswordEncrypted && !mPasswordHash.isEmpty() && !mPasswordSalt.isEmpty()) {
+                return net.micode.notes.tool.PasswordUtils.verifyPassword(password, mPasswordSalt, mPasswordHash);
+            }
+        } catch (Exception e) {
+            Log.e(TAG, "Verify password failed", e);
+        }
+        return false;
+    }
+
+    /**
+     * 移除密码
+     */
+    public void removePassword() {
+        mPasswordEncrypted = false;
+        mPasswordHash = "";
+        mPasswordSalt = "";
+        mNote.setNoteValue(NoteColumns.PASSWORD_ENCRYPTED, "0");
+        mNote.setNoteValue(NoteColumns.PASSWORD_HASH, "");
+        mNote.setNoteValue(NoteColumns.PASSWORD_SALT, "");
+    }
+
+    /**
+     * 检查是否有密码保护
+     * @return 是否有密码保护
+     */
+    public boolean isPasswordProtected() {
+        return mPasswordEncrypted;
+    }
+}
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/tool/BackupUtils.java b/src/Notes-master/app/src/main/java/net/micode/notes/tool/BackupUtils.java
new file mode 100644
index 0000000..d2577d1
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/net/micode/notes/tool/BackupUtils.java
@@ -0,0 +1,403 @@
+/*
+ * 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;
+
+/**
+ * 便签数据备份工具类，提供便签数据导出为文本文件的功能
+ *
+ * 核心功能：
+ * - 将便签数据（包括文件夹、普通便签、通话记录）导出为可读文本格式
+ * - 自动生成带时间戳的备份文件，避免覆盖现有备份
+ * - 支持外部存储设备（SD卡）检测，确保备份文件可存储
+ *
+ * 设计原理：
+ * 采用单例模式确保工具类实例唯一性
+ * 内部类TextExport封装实际导出逻辑，实现职责分离
+ * 使用Android ContentProvider查询便签数据，确保数据一致性
+ *
+ * 注意事项：
+ * 1. 需要外部存储（SD卡）可写权限
+ * 2. 备份文件格式为文本，便于用户阅读但不易于程序解析还原
+ * 3. 备份过程可能耗时，应在后台线程执行
+ *
+ * @see Environment 外部存储状态检测
+ * @see ContentResolver 数据查询接口
+ */
+public class BackupUtils {
+    private static final String TAG = "BackupUtils";
+    // Singleton stuff
+    private static BackupUtils sInstance;
+    /**
+     * 获取备份工具单例实例
+     * 采用同步方法确保多线程环境下的实例唯一性
+     *
+     * @param context 上下文对象，用于资源访问
+     * @return BackupUtils单例实例
+     */
+    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;
+    /**
+     * 私有构造函数，初始化文本导出组件
+     * 确保只能通过getInstance方法获取实例
+     */
+    private BackupUtils(Context context) {
+        mTextExport = new TextExport(context);
+    }
+    /**
+     * 检查外部存储是否可用（已挂载且可写）
+     * 备份操作的前提条件验证
+     *
+     * @return true表示外部存储可用，false不可用
+     */
+    private static boolean externalStorageAvailable() {
+        return Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState());
+    }
+    /**
+     * 执行便签数据导出为文本文件
+     * 主入口方法，调用内部类完成实际导出逻辑
+     *
+     * @return 备份状态码，表示导出结果
+     */
+    public int exportToText() {
+        return mTextExport.exportToText();
+    }
+    /**
+     * 获取导出的文本文件名
+     * 用于向用户显示备份文件信息
+     */
+    public String getExportedTextFileName() {
+        return mTextExport.mFileName;
+    }
+    /**
+     * 获取导出的文本文件目录
+     * 显示备份文件的完整存储路径
+     */
+    public String getExportedTextFileDir() {
+        return mTextExport.mFileDirectory;
+    }
+    /**
+     * 文本导出功能内部类，负责具体的便签数据到文本文件的转换
+     *
+     * 职责分离：
+     * - 管理便签数据和通话记录数据的查询和导出
+     * - 处理文本格式化和文件输出流
+     * - 维护导出文件的位置和命名规则
+     *
+     * 设计优势：将复杂的导出逻辑封装在内部类，保持BackupUtils接口简洁
+     */
+    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;
+        // 数据表查询字段投影，用于获取便签详细内容
+        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;
+        /**
+         * 构造函数，初始化文本格式和上下文引用
+         * 从资源文件加载导出文本的格式模板
+         *
+         * @param context 上下文对象，用于资源加载和内容解析
+         */
+        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;
+    }
+}
+
+
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/tool/DataUtils.java b/src/Notes-master/app/src/main/java/net/micode/notes/tool/DataUtils.java
new file mode 100644
index 0000000..0072c90
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/net/micode/notes/tool/DataUtils.java
@@ -0,0 +1,479 @@
+/*
+ * 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;
+
+/**
+ * 便签数据操作工具类，提供批量操作和查询功能的静态方法
+ *
+ * 核心职责：
+ * - 批量删除、移动便签数据，提高操作效率
+ * - 提供便签存在性验证和状态检查
+ * - 支持便签内容片段提取和格式化
+ * - 管理小组件关联数据的查询
+ *
+ * 设计模式：
+ * 采用工具类模式，所有方法为静态方法
+ * 使用ContentProviderOperation实现批量数据库操作
+ * 统一的异常处理和日志记录机制
+ *
+ * 注意事项：
+ * 1. 批量操作使用事务确保数据一致性
+ * 2. 系统文件夹受保护，禁止删除操作
+ * 3. 所有数据库操作需在后台线程执行
+ * 4. 及时关闭游标避免资源泄露
+ *
+ * @see ContentProviderOperation Android批量数据库操作
+ * @see ContentResolver 内容解析器接口
+ */
+public class DataUtils {
+    public static final String TAG = "DataUtils";
+    /**
+     * 批量删除便签集合，支持事务性操作
+     *
+     * 实现原理：
+     * 使用ContentProviderOperation构建批量删除操作
+     * 通过applyBatch方法原子性执行所有删除
+     *
+     * 安全机制：
+     * - 自动跳过系统根文件夹（ID_ROOT_FOLDER）
+     * - 空集合检查避免无效操作
+     * - 异常捕获和详细日志记录
+     *
+     * @param resolver 内容解析器，用于数据库访问
+     * @param ids 要删除的便签ID集合，null或空集合直接返回成功
+     * @return true删除成功，false删除失败
+     *
+     * 使用示例：
+     * HashSet<Long> ids = new HashSet<>();
+     * ids.add(123L);
+     * ids.add(456L);
+     * boolean result = DataUtils.batchDeleteNotes(resolver, ids);
+     */
+    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;
+    }
+    /**
+     * 移动单个便签到目标文件夹，更新父文件夹关联
+     *
+     * 业务逻辑：
+     * - 更新便签的父文件夹ID
+     * - 记录原始父文件夹用于可能的撤销操作
+     * - 标记便签为本地已修改，需要同步
+     *
+     * @param resolver 内容解析器
+     * @param id 要移动的便签ID
+     * @param srcFolderId 源文件夹ID
+     * @param desFolderId 目标文件夹ID
+     */
+    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);
+    }
+    /**
+     * 批量移动便签集合到指定文件夹
+     * 使用批量操作提高性能，减少数据库交互次数
+     *
+     * 性能优化：相比单个移动，批量操作减少事务开销
+     * 数据安全：批量操作原子性，要么全部成功要么全部失败
+     *
+     * @param resolver 内容解析器
+     * @param ids 要移动的便签ID集合
+     * @param folderId 目标文件夹ID
+     * @return true移动成功，false移动失败
+     */
+    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;
+    }
+
+    /**
+     * 获取用户自定义文件夹数量（排除系统文件夹）
+     * 用于界面显示和业务逻辑控制
+     *
+     * 查询条件：
+     * - 类型为文件夹（TYPE_FOLDER）
+     * - 排除回收站文件夹（ID_TRASH_FOLER）
+     * - 只统计用户创建的文件夹
+     *
+     * @param resolver 内容解析器
+     * @return 用户文件夹数量，查询失败返回0
+     */
+    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;
+    }
+    /**
+     * 检查便签在数据库中是否存在且可见（不在回收站）
+     * 用于便签操作前的有效性验证
+     *
+     * @param resolver 内容解析器
+     * @param noteId 要检查的便签ID
+     * @param type 便签类型（普通便签、文件夹等）
+     * @return true存在且可见，false不存在或在回收站
+     */
+    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;
+    }
+    /**
+     * 检查便签是否存在（包括回收站中的便签）
+     * 简单的存在性检查，不关心位置和状态
+     *
+     * @param resolver 内容解析器
+     * @param noteId 要检查的便签ID
+     * @return true存在，false不存在
+     */
+    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;
+    }
+    /**
+     * 检查文件夹名称是否已存在（可见文件夹中）
+     * 用于创建文件夹时的重名验证
+     *
+     * @param resolver 内容解析器
+     * @param name 要检查的文件夹名称
+     * @return true名称已存在，false名称可用
+     */
+    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;
+    }
+    /**
+     * 获取文件夹关联的小组件属性集合
+     * 用于便签列表小组件的数据绑定和更新
+     *
+     * 设计用途：
+     * - 文件夹删除时通知关联小组件更新
+     * - 便签变化时刷新对应小组件显示
+     * - 管理小组件生命周期
+     *
+     * @param resolver 内容解析器
+     * @param folderId 文件夹ID
+     * @return 小组件属性集合，可能为null
+     */
+    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;
+    }
+    /**
+     * 根据便签ID获取关联的电话号码
+     * 用于通话记录便签的显示和回调
+     *
+     * @param resolver 内容解析器
+     * @param noteId 便签ID
+     * @return 电话号码字符串，查询失败返回空字符串
+     */
+    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 "";
+    }
+    /**
+     * 根据电话号码和通话时间查找便签ID
+     * 用于来电显示时关联已有通话记录
+     *
+     * 技术亮点：使用自定义函数PHONE_NUMBERS_EQUAL进行电话号码匹配
+     * 支持不同格式的电话号码比较（如带空格、带区号等）
+     *
+     * @param resolver 内容解析器
+     * @param phoneNumber 电话号码
+     * @param callDate 通话时间戳
+     * @return 便签ID，未找到返回0
+     */
+    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;
+    }
+    /**
+     * 根据便签ID获取内容片段
+     * 用于列表显示和搜索预览
+     *
+     * @param resolver 内容解析器
+     * @param noteId 便签ID
+     * @return 便签内容片段，便签不存在时抛出异常
+     * @throws IllegalArgumentException 便签不存在时抛出
+     */
+    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);
+    }
+    /**
+     * 格式化便签片段，用于界面显示
+     * 处理逻辑：去除首尾空格，截取第一行内容
+     *
+     * 业务需求：列表界面显示简洁的便签预览
+     * 技术实现：简单的字符串处理，避免数据库复杂查询
+     *
+     * @param snippet 原始便签内容
+     * @return 格式化后的片段字符串
+     */
+    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;
+    }
+
+    /**
+     * 批量置顶便签集合，设置当前时间为置顶时间
+     *
+     * @param resolver 内容解析器，用于数据库访问
+     * @param ids 要置顶的便签ID集合
+     * @return true置顶成功，false置顶失败
+     */
+    public static boolean batchPinNotes(ContentResolver resolver, HashSet<Long> ids) {
+        if (ids == null || ids.size() == 0) {
+            Log.d(TAG, "No notes to pin");
+            return true;
+        }
+
+        long currentTime = System.currentTimeMillis();
+        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.PINNED_DATE, currentTime);
+            builder.withValue(NoteColumns.LOCAL_MODIFIED, 1);
+            operationList.add(builder.build());
+        }
+
+        try {
+            ContentProviderResult[] results = resolver.applyBatch(Notes.AUTHORITY, operationList);
+            if (results == null || results.length == 0) {
+                Log.d(TAG, "Pin 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;
+    }
+}
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/tool/GTaskStringUtils.java b/src/Notes-master/app/src/main/java/net/micode/notes/tool/GTaskStringUtils.java
new file mode 100644
index 0000000..da58ba4
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/net/micode/notes/tool/GTaskStringUtils.java
@@ -0,0 +1,271 @@
+/*
+ * 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;
+/**
+ * 谷歌任务（Google Task）同步相关字符串常量定义类
+ *
+ * 核心作用：
+ * - 统一管理GTask API接口的JSON键名和值常量
+ * - 定义便签与GTask同步时的数据映射规则
+ * - 提供元数据文件夹和特殊便签的命名规范
+ *
+ * 设计目的：
+ * 避免代码中硬编码字符串，提高可维护性
+ * 统一同步协议的数据格式，确保接口一致性
+ * 集中管理业务逻辑相关的字符串常量
+ *
+ * 使用场景：
+ * 1. 便签数据与Google Task服务之间的同步操作
+ * 2. JSON数据序列化和反序列化过程
+ * 3. 元数据便签的创建和识别
+ *
+ * 注意事项：
+ * 1. 常量命名遵循GTask API官方文档规范
+ * 2. 字符串值必须与服务器端严格一致
+ * 3. 修改常量可能影响同步功能稳定性
+ *
+ * @see <a href="https://developers.google.com/tasks">Google Tasks API</a>
+ */
+public class GTaskStringUtils {
+    /**
+     * 动作标识键，标识本次同步请求的唯一ID
+     * 用途：请求去重和响应匹配
+     */
+    public final static String GTASK_JSON_ACTION_ID = "action_id";
+    /**
+     * 动作列表键，包含多个同步操作的数组
+     * 用途：批量操作支持，提高同步效率
+     */
+    public final static String GTASK_JSON_ACTION_LIST = "action_list";
+    /**
+     * 动作类型键，指定具体的同步操作类型
+     * 值范围：create|get_all|move|update
+     */
+    public final static String GTASK_JSON_ACTION_TYPE = "action_type";
+    /**
+     * 创建新任务动作，用于新增便签同步到GTask
+     */
+    public final static String GTASK_JSON_ACTION_TYPE_CREATE = "create";
+    /**
+     * 全量获取动作，用于从GTask拉取所有任务数据
+     */
+    public final static String GTASK_JSON_ACTION_TYPE_GETALL = "get_all";
+    /**
+     * 移动任务动作，用于便签文件夹变更的同步
+     */
+    public final static String GTASK_JSON_ACTION_TYPE_MOVE = "move";
+    /**
+     * 更新任务动作，用于便签内容修改的同步
+     */
+    public final static String GTASK_JSON_ACTION_TYPE_UPDATE = "update";
+    /**
+     * 创建者ID键，标识任务的所有者
+     * 业务意义：多用户环境下的数据隔离
+     */
+    public final static String GTASK_JSON_CREATOR_ID = "creator_id";
+    /**
+     * 子实体键，包含子任务或嵌套任务列表
+     * 用途：支持任务分组和层次结构
+     */
+    public final static String GTASK_JSON_CHILD_ENTITY = "child_entity";
+    /**
+     * 客户端版本键，标识客户端软件版本
+     * 用途：版本兼容性检查和功能降级
+     */
+    public final static String GTASK_JSON_CLIENT_VERSION = "client_version";
+    /**
+     * 完成状态键，标记任务是否已完成
+     * 映射关系：便签的完成状态→GTask完成状态
+     */
+    public final static String GTASK_JSON_COMPLETED = "completed";
+    /**
+     * 当前列表ID键，标识任务所属的任务列表
+     * 业务逻辑：便签文件夹与GTask任务列表的对应
+     */
+    public final static String GTASK_JSON_CURRENT_LIST_ID = "current_list_id";
+    /**
+     * 默认列表ID键，用户默认的任务列表
+     * 用途：新便签的默认存储位置映射
+     */
+    public final static String GTASK_JSON_DEFAULT_LIST_ID = "default_list_id";
+    /**
+     * 删除标记键，软删除标识（非物理删除）
+     * 设计考虑：支持删除同步和回收站功能
+     */
+    public final static String GTASK_JSON_DELETED = "deleted";
+    /**
+     * 目的列表键，移动操作的目标列表标识
+     * 业务场景：便签在不同文件夹间的移动
+     */
+    public final static String GTASK_JSON_DEST_LIST = "dest_list";
+    /**
+     * 目的父节点键，移动操作的目标父节点
+     * 用途：变更任务的层次结构位置
+     */
+    public final static String GTASK_JSON_DEST_PARENT = "dest_parent";
+    /**
+     * 目的父节点类型键，标识目标父节点的类型
+     * 值范围：TASK|GROUP，控制移动的合法性
+     */
+    public final static String GTASK_JSON_DEST_PARENT_TYPE = "dest_parent_type";
+    /**
+     * 实体增量键，包含数据变更的增量信息
+     * 优化目的：减少同步数据传输量
+     */
+    public final static String GTASK_JSON_ENTITY_DELTA = "entity_delta";
+    /**
+     * 实体类型键，区分任务和任务列表两种实体
+     * 值范围：TASK（任务）| GROUP（任务组/列表）
+     */
+    public final static String GTASK_JSON_ENTITY_TYPE = "entity_type";
+    /**
+     * 获取已删除数据键，控制是否同步删除的任务
+     * 用途：回收站同步和数据清理
+     */
+    public final static String GTASK_JSON_GET_DELETED = "get_deleted";
+    /**
+     * 实体ID键，任务或任务列表的唯一标识
+     * 技术实现：使用UUID或自增ID，全局唯一
+     */
+    public final static String GTASK_JSON_ID = "id";
+    /**
+     * 排序索引键，控制任务在列表中的显示顺序
+     * 业务需求：保持便签的手动排序结果
+     */
+    public final static String GTASK_JSON_INDEX = "index";
+    /**
+     * 最后修改时间键，用于冲突检测和增量同步
+     * 同步策略：基于时间戳的乐观锁机制
+     */
+    public final static String GTASK_JSON_LAST_MODIFIED = "last_modified";
+    /**
+     * 最新同步点键，记录上次同步的成功位置
+     * 用途：断点续传和增量同步支持
+     */
+    public final static String GTASK_JSON_LATEST_SYNC_POINT = "latest_sync_point";
+    /**
+     * 列表ID键，任务所属列表的标识
+     * 映射关系：便签的父文件夹ID→GTask列表ID
+     */
+    public final static String GTASK_JSON_LIST_ID = "list_id";
+    /**
+     * 列表集合键，包含多个任务列表的容器
+     * 对应关系：便签的文件夹列表→GTask任务列表集合
+     */
+    public final static String GTASK_JSON_LISTS = "lists";
+    /**
+     * 名称键，任务或任务列表的显示名称
+     * 映射关系：便签标题→GTask任务标题
+     */
+    public final static String GTASK_JSON_NAME = "name";
+    /**
+     * 新ID键，用于ID冲突时的重新分配
+     * 场景：客户端生成临时ID，服务器分配正式ID
+     */
+    public final static String GTASK_JSON_NEW_ID = "new_id";
+    /**
+     * 便签集合键（备用键名），与TASKS同义
+     * 兼容性考虑：支持不同的API版本或扩展
+     */
+    public final static String GTASK_JSON_NOTES = "notes";
+    /**
+     * 父ID键，标识任务的父任务或父列表
+     * 用途：支持任务嵌套和树状结构
+     */
+    public final static String GTASK_JSON_PARENT_ID = "parent_id";
+    /**
+     * 前兄弟节点ID键，定义任务在列表中的相对位置
+     * 排序算法：基于前驱引用的链表式排序
+     */
+    public final static String GTASK_JSON_PRIOR_SIBLING_ID = "prior_sibling_id";
+    /**
+     * 结果集合键，包含同步操作的结果数组
+     * 响应结构：每个操作对应一个结果对象
+     */
+    public final static String GTASK_JSON_RESULTS = "results";
+    /**
+     * 源列表键，移动操作的源列表标识
+     * 用途：记录任务移动的原始位置
+     */
+    public final static String GTASK_JSON_SOURCE_LIST = "source_list";
+    /**
+     * 任务集合键，包含多个任务的容器
+     * 数据映射：便签列表→GTask任务集合
+     */
+    public final static String GTASK_JSON_TASKS = "tasks";
+    /**
+     * 类型键的通用键名，与ENTITY_TYPE功能类似
+     * 设计考虑：提供不同名称的相同功能键，增强兼容性
+     */
+    public final static String GTASK_JSON_TYPE = "type";
+    /**
+     * 组类型值，表示任务列表或文件夹实体
+     * 业务映射：便签文件夹→GTask任务列表（GROUP）
+     */
+    public final static String GTASK_JSON_TYPE_GROUP = "GROUP";
+    /**
+     * 任务类型值，表示具体的任务实体
+     * 业务映射：单个便签→GTask任务（TASK）
+     */
+    public final static String GTASK_JSON_TYPE_TASK = "TASK";
+    /**
+     * 用户信息键，包含用户身份和配置信息
+     * 用途：多账户支持和个性化配置
+     */
+    public final static String GTASK_JSON_USER = "user";
+    /**
+     * MIUI文件夹前缀，标识为MIUI便签同步创建的GTask列表
+     * 命名规则：确保自动创建的文件夹可识别且不冲突
+     */
+    public final static String MIUI_FOLDER_PREFFIX = "[MIUI_Notes]";
+    /**
+     * 默认文件夹名称，对应便签的根文件夹
+     * 业务逻辑：新便签的默认存储位置映射
+     */
+    public final static String FOLDER_DEFAULT = "Default";
+    /**
+     * 通话记录文件夹名称，特殊类型便签的专用文件夹
+     * 设计考虑：通话记录便签需要独立分类管理
+     */
+    public final static String FOLDER_CALL_NOTE = "Call_Note";
+    /**
+     * 元数据文件夹名称，用于存储同步状态信息
+     * 技术实现：隐藏文件夹，用户不可见，仅程序使用
+     */
+    public final static String FOLDER_META = "METADATA";
+    /**
+     * GTask ID元数据头，存储便签对应的GTask任务ID
+     * 用途：维护本地便签与GTask任务的映射关系
+     */
+    public final static String META_HEAD_GTASK_ID = "meta_gid";
+    /**
+     * 便签元数据头，存储便签的同步状态信息
+     * 内容：修改时间、冲突标记、同步版本等
+     */
+    public final static String META_HEAD_NOTE = "meta_note";
+    /**
+     * 数据元数据头，存储便签内容的同步状态
+     * 粒度控制：支持便签内容和元数据的独立同步
+     */
+    public final static String META_HEAD_DATA = "meta_data";
+    /**
+     * 元数据便签名称，特殊便签用于存储全局同步状态
+     * 警告提示：提醒用户不要手动修改或删除此便签
+     */
+    public final static String META_NOTE_NAME = "[META INFO] DON'T UPDATE AND DELETE";
+
+}
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/tool/PasswordUtils.java b/src/Notes-master/app/src/main/java/net/micode/notes/tool/PasswordUtils.java
new file mode 100644
index 0000000..1c5a810
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/net/micode/notes/tool/PasswordUtils.java
@@ -0,0 +1,85 @@
+/*
+ * 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.util.Base64;
+
+import java.security.NoSuchAlgorithmException;
+import java.security.SecureRandom;
+import java.security.spec.InvalidKeySpecException;
+import java.security.spec.KeySpec;
+import java.util.Arrays;
+
+import javax.crypto.SecretKeyFactory;
+import javax.crypto.spec.PBEKeySpec;
+
+public class PasswordUtils {
+    private static final String TAG = "PasswordUtils";
+    private static final int SALT_LENGTH = 16; // 盐值长度
+    private static final int ITERATIONS = 10000; // 迭代次数
+    private static final int KEY_LENGTH = 256; // 密钥长度
+
+    /**
+     * 生成随机盐值
+     * @return 盐值的Base64编码字符串
+     */
+    public static String generateSalt() {
+        SecureRandom random = new SecureRandom();
+        byte[] salt = new byte[SALT_LENGTH];
+        random.nextBytes(salt);
+        return Base64.encodeToString(salt, Base64.NO_WRAP);
+    }
+
+    /**
+     * 生成密码哈希值
+     * @param password 原始密码
+     * @param salt 盐值
+     * @return 密码哈希的Base64编码字符串
+     * @throws NoSuchAlgorithmException 算法不存在异常
+     * @throws InvalidKeySpecException 密钥规范异常
+     */
+    public static String generatePasswordHash(String password, String salt) throws NoSuchAlgorithmException, InvalidKeySpecException {
+        byte[] saltBytes = Base64.decode(salt, Base64.NO_WRAP);
+        KeySpec spec = new PBEKeySpec(password.toCharArray(), saltBytes, ITERATIONS, KEY_LENGTH);
+        SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256");
+        byte[] hash = factory.generateSecret(spec).getEncoded();
+        return Base64.encodeToString(hash, Base64.NO_WRAP);
+    }
+
+    /**
+     * 验证密码是否正确
+     * @param password 待验证的密码
+     * @param salt 盐值
+     * @param expectedHash 期望的哈希值
+     * @return 密码是否正确
+     * @throws NoSuchAlgorithmException 算法不存在异常
+     * @throws InvalidKeySpecException 密钥规范异常
+     */
+    public static boolean verifyPassword(String password, String salt, String expectedHash) throws NoSuchAlgorithmException, InvalidKeySpecException {
+        String actualHash = generatePasswordHash(password, salt);
+        return Arrays.equals(actualHash.getBytes(), expectedHash.getBytes());
+    }
+
+    /**
+     * 验证密码格式是否正确（4-6位数字）
+     * @param password 待验证的密码
+     * @return 密码格式是否正确
+     */
+    public static boolean isValidPasswordFormat(String password) {
+        return password != null && password.matches("\\d{4,6}");
+    }
+}
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/tool/ResourceParser.java b/src/Notes-master/app/src/main/java/net/micode/notes/tool/ResourceParser.java
new file mode 100644
index 0000000..54f99e3
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/net/micode/notes/tool/ResourceParser.java
@@ -0,0 +1,353 @@
+/*
+ * 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;
+/**
+ * 便签应用资源解析工具类，统一管理UI相关的颜色、字体和背景资源
+ *
+ * 核心职责：
+ * - 定义便签背景颜色常量与资源ID的映射关系
+ * - 管理文字大小级别的枚举和样式资源
+ * - 提供不同界面场景（编辑、列表、小组件）的背景资源
+ * - 处理资源ID的安全访问和默认值回退
+ *
+ * 设计模式：
+ * 采用工具类模式，所有方法为静态方法
+ * 使用内部类组织不同场景的资源映射
+ * 常量枚举确保资源访问的类型安全
+ *
+ * 资源组织原则：
+ * 1. 颜色资源按功能场景分组管理
+ * 2. 尺寸资源支持用户自定义配置
+ * 3. 资源ID集中管理避免硬编码
+ *
+ * 注意事项：
+ * 1. 资源ID必须与实际资源文件严格对应
+ * 2. 数组索引访问需要边界检查
+ * 3. 默认值机制确保异常情况下的可用性
+ */
+public class ResourceParser {
+    /**
+     * 便签背景颜色常量定义
+     * 采用枚举式常量设计，确保颜色值的一致性
+     * 颜色顺序与资源数组中的索引位置严格对应
+     */
+    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;
+    /**
+     * 默认背景颜色常量
+     * 业务逻辑：新便签创建时的默认颜色设置
+     * 设计考虑：黄色为暖色调，适合阅读且不刺眼
+     */
+    public static final int BG_DEFAULT_COLOR = YELLOW;
+    /**
+     * 文字大小级别常量定义
+     * 支持用户自定义字体大小，提供四个级别选择
+     * 级别与具体尺寸的映射在样式资源中定义
+     */
+    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;
+    /**
+     * 默认字体大小级别
+     * 用户体验：中等大小在可读性和信息密度间取得平衡
+     */
+    public static final int BG_DEFAULT_FONT_SIZE = TEXT_MEDIUM;
+    /**
+     * 便签编辑界面背景资源管理内部类
+     * 专门处理便签编辑页面的背景图片资源映射
+     *
+     * 设计原理：
+     * 编辑界面需要区分内容区和标题区的背景
+     * 相同颜色主题在不同区域使用不同的背景图片
+     * 资源数组索引与颜色常量严格对应
+     */
+    public static class NoteBgResources {
+        /**
+         * 便签内容编辑区域背景资源数组
+         * 资源顺序：黄色、蓝色、白色、绿色、红色
+         * 对应drawable中的edit_yellow, edit_blue等资源文件
+         */
+        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
+        };
+        /**
+         * 便签标题区域背景资源数组
+         * 设计特点：标题区背景通常与内容区视觉区分但风格统一
+         * 资源命名：edit_title_yellow, edit_title_blue等
+         */
+        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
+        };
+        /**
+         * 根据颜色ID获取便签内容区背景资源
+         * 安全机制：数组索引访问，调用方需确保id在有效范围内
+         *
+         * @param id 颜色常量（YELLOW、BLUE等）
+         * @return 对应的背景资源ID
+         */
+        public static int getNoteBgResource(int id) {
+            return BG_EDIT_RESOURCES[id];
+        }
+        /**
+         * 根据颜色ID获取便签标题区背景资源
+         * 使用场景：编辑界面标题栏与内容区的视觉区分
+         *
+         * @param id 颜色常量
+         * @return 对应的标题背景资源ID
+         */
+        public static int getNoteTitleBgResource(int id) {
+            return BG_EDIT_TITLE_RESOURCES[id];
+        }
+    }
+    /**
+     * 获取默认背景颜色ID，支持随机颜色功能
+     * 业务逻辑：根据用户偏好设置决定使用固定颜色还是随机颜色
+     *
+     * 用户配置：通过NotesPreferenceActivity.PREFERENCE_SET_BG_COLOR_KEY控制
+     * 随机模式：为新增便签提供多样化的视觉体验
+     * 固定模式：保持界面一致性，适合偏好稳定的用户
+     *
+     * @param context 上下文对象，用于访问偏好设置
+     * @return 背景颜色ID（0-4之间的整数）
+     */
+    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;
+        }
+    }
+    /**
+     * 便签列表项背景资源管理内部类
+     * 处理便签列表界面中不同位置项目的背景显示
+     *
+     * 列表项类型：
+     * - 首项：顶部圆角背景
+     * - 中间项：平直背景
+     * - 末项：底部圆角背景
+     * - 单项：独立项目的完整圆角背景
+     *
+     * 视觉设计：仿照Android系统列表的视觉效果，提供连贯的视觉流
+     */
+    public static class NoteItemBgResources {
+        /**
+         * 列表首项背景资源数组
+         * 视觉特征：顶部圆角，底部直角，用于列表开始位置
+         */
+        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
+        };
+        /**
+         * 列表中间项背景资源数组
+         * 视觉特征：直角矩形，用于列表中间连续项目
+         */
+        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
+        };
+        /**
+         * 列表末项背景资源数组
+         * 视觉特征：顶部直角，底部圆角，用于列表结束位置
+         */
+        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,
+        };
+        /**
+         * 独立单项背景资源数组
+         * 使用场景：列表中只有一个项目时的完整圆角背景
+         */
+        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
+        };
+        /**
+         * 获取列表首项背景资源
+         * 应用场景：便签列表的第一个项目
+         *
+         * @param id 颜色常量ID
+         * @return 对应的首项背景资源ID
+         */
+        public static int getNoteBgFirstRes(int id) {
+            return BG_FIRST_RESOURCES[id];
+        }
+        /**
+         * 获取列表末项背景资源
+         * 应用场景：便签列表的最后一个项目
+         */
+        public static int getNoteBgLastRes(int id) {
+            return BG_LAST_RESOURCES[id];
+        }
+        /**
+         * 获取独立单项背景资源
+         * 应用场景：列表中只有一个项目时使用
+         */
+        public static int getNoteBgSingleRes(int id) {
+            return BG_SINGLE_RESOURCES[id];
+        }
+        /**
+         * 获取列表中间项背景资源
+         * 应用场景：便签列表的中间连续项目
+         */
+        public static int getNoteBgNormalRes(int id) {
+            return BG_NORMAL_RESOURCES[id];
+        }
+        /**
+         * 获取文件夹项背景资源
+         * 特殊处理：文件夹使用统一的背景，不随颜色主题变化
+         * 设计考虑：区分便签和文件夹的视觉层次
+         *
+         * @return 文件夹固定背景资源ID
+         */
+        public static int getFolderBgRes() {
+            return R.drawable.list_folder;
+        }
+    }
+    /**
+     * 桌面小组件背景资源管理内部类
+     * 处理不同尺寸桌面小组件的背景资源映射
+     *
+     * 小组件尺寸标准：
+     * - 2x1小组件：占据2列1行的标准尺寸
+     * - 4x2小组件：占据4列2行的大尺寸，显示更多内容
+     *
+     * 设计约束：小组件背景需要适应各种桌面主题和壁纸
+     */
+    public static class WidgetBgResources {
+        /**
+         * 2x1尺寸小组件背景资源数组
+         * 布局特点：窄长形状，适合显示便签标题和简短内容
+         */
+        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,
+        };
+        /**
+         * 获取2x1小组件背景资源
+         * 性能考虑：小组件需要快速加载，资源文件应优化大小
+         *
+         * @param id 颜色常量ID
+         * @return 对应的2x1小组件背景资源ID
+         */
+        public static int getWidget2xBgResource(int id) {
+            return BG_2X_RESOURCES[id];
+        }
+        /**
+         * 4x2尺寸小组件背景资源数组
+         * 布局特点：较大面积，可以显示便签的完整内容预览
+         */
+        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
+        };
+        /**
+         * 获取4x2小组件背景资源
+         * 使用场景：用户需要在大尺寸小组件中浏览便签内容
+         */
+        public static int getWidget4xBgResource(int id) {
+            return BG_4X_RESOURCES[id];
+        }
+    }
+    /**
+     * 文字外观样式资源管理内部类
+     * 处理便签内容文字的大小和样式配置
+     *
+     * 技术实现：通过Android样式资源定义文字外观
+     * 支持功能：用户可自定义便签内容的显示大小
+     */
+    public static class TextAppearanceResources {
+        /**
+         * 文字外观样式资源数组
+         * 对应values/styles.xml中定义的TextAppearance样式
+         * 样式定义包含字体大小、颜色、字重等属性
+         */
+        private final static int [] TEXTAPPEARANCE_RESOURCES = new int [] {
+            R.style.TextAppearanceNormal,
+            R.style.TextAppearanceMedium,
+            R.style.TextAppearanceLarge,
+            R.style.TextAppearanceSuper
+        };
+        /**
+         * 根据字体大小级别获取对应的文字外观样式资源
+         * 安全机制：包含边界检查，防止数组越界异常
+         *
+         * 问题修复：修复SharedPreferences中存储的资源ID可能越界的问题
+         * 当存储的id超过资源数组大小时，返回默认的字体大小
+         *
+         * @param id 字体大小级别常量（TEXT_SMALL等）
+         * @return 对应的文字外观样式资源ID
+         */
+        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];
+        }
+        /**
+         * 获取可用的文字外观样式数量
+         * 用途：界面设置选项的动态生成和验证
+         *
+         * @return 可用的文字样式种类数量
+         */
+        public static int getResourcesSize() {
+            return TEXTAPPEARANCE_RESOURCES.length;
+        }
+    }
+}
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/ui/AlarmAlertActivity.java b/src/Notes-master/app/src/main/java/net/micode/notes/ui/AlarmAlertActivity.java
new file mode 100644
index 0000000..3eac05d
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/net/micode/notes/ui/AlarmAlertActivity.java
@@ -0,0 +1,198 @@
+/*
+ * 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;
+/**
+ * 闹钟提醒活动，负责处理便签提醒的显示和交互
+ *
+ * 核心功能：
+ * - 在指定时间弹出提醒对话框并播放提示音
+ * - 支持屏幕锁定状态下的提醒显示
+ * - 提供快速跳转到便签编辑页面的入口
+ *
+ * 设计原理：
+ * 继承Activity基类，实现对话框交互接口
+ * 使用MediaPlayer播放系统闹钟铃声
+ * 通过WindowManager控制屏幕亮起行为
+ *
+ * 注意事项：
+ * 1. 需要处理音频播放的各种异常情况
+ * 2. 屏幕状态检测影响界面显示逻辑
+ * 3. 便签内容截取显示，避免界面过长
+ *
+ * @see Activity Android活动基类
+ * @see MediaPlayer 媒体播放器
+ */
+
+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;
+    /**
+     * 活动创建初始化，设置界面和准备提醒数据
+     *
+     * 初始化流程：
+     * 1. 设置无标题栏界面风格
+     * 2. 配置窗口标志，支持锁屏显示和屏幕控制
+     * 3. 从Intent中解析便签ID和内容
+     * 4. 验证便签有效性并启动提醒
+     *
+     * 注意事项：
+     * - 屏幕关闭时自动亮屏并保持屏幕开启
+     * - 便签内容过长时自动截断并添加省略提示
+     * - 便签不存在时立即结束活动
+     *
+     * @param savedInstanceState 保存的实例状态，此处未使用
+     */
+    @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();
+        }
+    }
+    /**
+     * 检测当前屏幕是否处于亮起状态
+     * 用途：决定是否需要强制亮屏和界面显示方式
+     *
+     * @return true表示屏幕已亮，false表示屏幕关闭
+     */
+    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;
+        }
+    }
+}
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/ui/AlarmInitReceiver.java b/src/Notes-master/app/src/main/java/net/micode/notes/ui/AlarmInitReceiver.java
new file mode 100644
index 0000000..32088d3
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/net/micode/notes/ui/AlarmInitReceiver.java
@@ -0,0 +1,150 @@
+/*
+ * 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;
+
+/**
+ * 系统启动广播接收器，负责重新初始化便签提醒闹钟
+ *
+ * 核心功能：
+ * - 监听设备启动完成广播（BOOT_COMPLETED）
+ * - 查询所有未来时间的便签提醒记录
+ * - 为每个未触发的提醒重新注册系统闹钟
+ *
+ * 设计背景：
+ * Android系统重启后所有AlarmManager闹钟会被清除
+ * 需要重新注册以确保提醒功能正常运作
+ *
+ * 实现原理：
+ * 1. 继承BroadcastReceiver接收系统启动广播
+ * 2. 查询数据库中提醒时间大于当前时间的便签
+ * 3. 使用AlarmManager为每个便签重新设置闹钟
+ *
+ * 注册方式：
+ * 在AndroidManifest.xml中声明BOOT_COMPLETED权限和intent-filter
+ *
+ * 注意事项：
+ * 1. 需要android.permission.RECEIVE_BOOT_COMPLETED权限
+ * 2. 只处理普通便签类型（TYPE_NOTE），排除文件夹和系统便签
+ * 3. 闹钟时间使用RTC_WAKEUP模式，确保休眠状态也能唤醒设备
+ *
+ * @see BroadcastReceiver Android广播接收器基类
+ * @see AlarmManager 系统闹钟管理服务
+ */
+public class AlarmInitReceiver extends BroadcastReceiver {
+    /**
+     * 便签提醒查询字段投影定义
+     * 优化原则：只查询需要的字段，减少内存占用和提高查询效率
+     *
+     * 字段说明：
+     * - ID：便签唯一标识，用于构建提醒触发的目标URI
+     * - ALERTED_DATE：提醒时间戳，用于设置闹钟触发时间
+     */
+    private static final String [] PROJECTION = new String [] {
+        NoteColumns.ID,
+        NoteColumns.ALERTED_DATE
+    };
+    /**
+     * 查询结果列索引常量
+     * 提高代码可读性，避免魔法数字
+     * 与PROJECTION数组定义顺序严格对应
+     */
+    private static final int COLUMN_ID                = 0;
+    private static final int COLUMN_ALERTED_DATE      = 1;
+    /**
+     * 系统启动广播接收处理方法，负责重新注册所有未触发的便签提醒闹钟
+     *
+     * 方法执行流程：
+     * 1. 获取当前系统时间作为查询基准，只处理未来时间的提醒
+     * 2. 查询数据库中所有提醒时间大于当前时间的普通便签记录
+     * 3. 遍历查询结果，为每个便签创建并注册系统闹钟
+     * 4. 确保数据库游标资源正确释放，避免内存泄露
+     *
+     * 核心业务逻辑：
+     * - 查询条件：ALERTED_DATE > 当前时间 AND TYPE = 普通便签
+     * - 闹钟类型：RTC_WAKEUP（实时时钟唤醒模式）
+     * - 意图传递：通过URI携带便签ID，确保提醒精确匹配
+     *
+     * 技术实现细节：
+     * 1. 使用ContentResolver查询便签数据库，只获取ID和提醒时间字段
+     * 2. 通过Cursor遍历查询结果，逐条处理每个需要提醒的便签
+     * 3. 创建指向AlarmReceiver的PendingIntent，用于闹钟触发时唤醒设备
+     * 4. 使用AlarmManager设置精确的唤醒闹钟
+     *
+     * 异常处理机制：
+     * - 游标操作包含空值检查和移动异常处理
+     * - 单个便签闹钟设置失败不影响其他便签处理
+     * - 最终确保数据库游标被正确关闭
+     *
+     * 性能优化考虑：
+     * - 查询投影只包含必要字段，减少内存占用
+     * - 使用索引字段（ALERTED_DATE）提高查询效率
+     * - 批量处理避免多次数据库连接开销
+     *
+     * 使用场景：
+     * - 设备重启后自动执行
+     * - 系统时区变更后需要重新计算提醒时间
+     * - 应用数据被清除后需要恢复提醒设置
+     *
+     * 注意事项：
+     * 1. 需要RECEIVE_BOOT_COMPLETED系统权限
+     * 2. 只处理普通便签类型，排除文件夹和系统便签
+     * 3. 闹钟使用FLAG_UPDATE_CURRENT避免重复创建
+     * 4. 游标遍历完成后必须调用close()释放资源
+     *
+     * @param context 上下文对象，用于访问系统服务和内容解析器
+     * @param intent 接收到的广播意图，通常为BOOT_COMPLETED动作
+     *
+     * @see AlarmManager#RTC_WAKEUP 实时时钟唤醒闹钟类型
+     * @see PendingIntent#FLAG_UPDATE_CURRENT 意图更新标志
+     * @see ContentUris#withAppendedId URI构建方法
+     */
+    @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();
+        }
+    }
+}
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/ui/AlarmReceiver.java b/src/Notes-master/app/src/main/java/net/micode/notes/ui/AlarmReceiver.java
new file mode 100644
index 0000000..56847a0
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/net/micode/notes/ui/AlarmReceiver.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.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+/**
+ * 闹钟触发广播接收器，作为系统闹钟与便签提醒界面的桥梁
+ *
+ * 核心职责：
+ * - 监听系统AlarmManager触发的便签提醒广播
+ * - 将系统闹钟事件转换为便签提醒界面的启动指令
+ * - 处理设备休眠状态下的提醒唤醒逻辑
+ *
+ * 设计原理：
+ * 继承BroadcastReceiver接收系统闹钟广播
+ * 通过Intent跳转将控制权交给AlarmAlertActivity
+ * 使用NEW_TASK标志确保从后台启动Activity
+ *
+ * 触发机制：
+ * 1. AlarmInitReceiver在系统启动时注册未来提醒
+ * 2. AlarmManager在指定时间触发PendingIntent
+ * 3. 本接收器被唤醒并启动提醒界面
+ *
+ * 技术特点：
+ * - 轻量级设计，仅做简单的Intent转换
+ * - 支持设备休眠状态下的可靠唤醒
+ * - 与AlarmInitReceiver形成完整的提醒生命周期管理
+ *
+ * 注意事项：
+ * 1. 需要在AndroidManifest.xml中声明广播接收器
+ * 2. 使用FLAG_ACTIVITY_NEW_TASK确保Activity正确启动
+ * 3. 接收的Intent包含便签ID数据，用于加载具体提醒内容
+ *
+ * @see BroadcastReceiver Android广播接收器基类
+ * @see AlarmAlertActivity 便签提醒显示界面
+ * @see AlarmInitReceiver 闹钟初始化接收器
+ */
+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);
+    }
+}
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/ui/DateTimePicker.java b/src/Notes-master/app/src/main/java/net/micode/notes/ui/DateTimePicker.java
new file mode 100644
index 0000000..f0dac9c
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/net/micode/notes/ui/DateTimePicker.java
@@ -0,0 +1,586 @@
+/*
+ * 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;
+/**
+ * 自定义日期时间选择器控件，提供直观的日期和时间选择界面
+ *
+ * 核心功能：
+ * - 支持日期、小时、分钟和AM/PM的独立选择
+ * - 自适应12小时制和24小时制时间格式
+ * - 提供日期相对显示（如"今天"、"明天"等）
+ * - 支持日期时间变更的事件回调通知
+ *
+ * 设计原理：
+ * 继承FrameLayout容器，组合多个NumberPicker实现日期时间选择
+ * 使用Calendar对象维护内部日期时间状态
+ * 通过值变更监听器实现各选择器之间的联动
+ *
+ * 界面特点：
+ * - 日期显示为相对格式（MM.dd EEEE）
+ * - 小时和分钟采用数字选择器
+ * - AM/PM选择器在12小时制下可见
+ * - 支持禁用状态下的视觉反馈
+ *
+ * 使用场景：
+ * 1. 便签提醒时间的设置界面
+ * 2. 需要日期时间选择的表单输入
+ * 3. 替代系统标准日期时间选择器
+ *
+ * 注意事项：
+ * 1. 日期显示范围为当前日期的前后3天（共7天）
+ * 2. 小时和分钟选择支持循环滚动
+ * 3. 初始化过程中避免不必要的事件触发
+ *
+ * @see NumberPicker Android数字选择器组件
+ * @see Calendar 日期时间计算工具类
+ */
+public class DateTimePicker extends FrameLayout {
+    // 默认启用状态常量
+    private static final boolean DEFAULT_ENABLE_STATE = true;
+    // 时间格式相关常量
+    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;
+    // 日期选择器范围常量
+    private static final int DATE_SPINNER_MIN_VAL = 0;
+    private static final int DATE_SPINNER_MAX_VAL = DAYS_IN_ALL_WEEK - 1;
+    // 24小时制小时选择器范围
+    private static final int HOUR_SPINNER_MIN_VAL_24_HOUR_VIEW = 0;
+    private static final int HOUR_SPINNER_MAX_VAL_24_HOUR_VIEW = 23;
+    // 12小时制小时选择器范围
+    private static final int HOUR_SPINNER_MIN_VAL_12_HOUR_VIEW = 1;
+    private static final int HOUR_SPINNER_MAX_VAL_12_HOUR_VIEW = 12;
+    // 分钟选择器范围常量
+    private static final int MINUT_SPINNER_MIN_VAL = 0;
+    private static final int MINUT_SPINNER_MAX_VAL = 59;
+    // AM/PM选择器范围常量
+    private static final int AMPM_SPINNER_MIN_VAL = 0;
+    private static final int AMPM_SPINNER_MAX_VAL = 1;
+    // UI组件实例
+    private final NumberPicker mDateSpinner;
+    private final NumberPicker mHourSpinner;
+    private final NumberPicker mMinuteSpinner;
+    private final NumberPicker mAmPmSpinner;
+    // 数据状态
+    private Calendar mDate;
+
+    private String[] mDateDisplayValues = new String[DAYS_IN_ALL_WEEK];
+    // 控件状态
+    private boolean mIsAm;
+
+    private boolean mIs24HourView;
+
+    private boolean mIsEnabled = DEFAULT_ENABLE_STATE;
+
+    private boolean mInitialising;
+    // 事件监听器
+    private OnDateTimeChangedListener mOnDateTimeChangedListener;
+    /**
+     * 日期选择器值变更监听器
+     * 处理用户选择不同日期时的逻辑
+     *
+     * 业务逻辑：
+     * - 计算新旧日期之间的天数差异
+     * - 更新内部Calendar对象的日期值
+     * - 刷新日期显示控件的内容
+     * - 通知外部监听器日期时间变化
+     */
+    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();
+        }
+    };
+    /**
+     * 小时选择器值变更监听器
+     * 处理小时变化及可能的日期边界跨越逻辑
+     *
+     * 复杂业务逻辑：
+     * - 12小时制下的AM/PM自动切换
+     * - 小时滚动到边界时的日期自动调整
+     * - 保持时间显示的连贯性和正确性
+     */
+    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();
+        }
+    };
+    /**
+     * 日期时间变更监听器接口
+     * 用于通知外部组件日期时间选择的变化
+     *
+     * 设计目的：解耦界面交互和业务逻辑处理
+     * 触发时机：任何日期时间组成部分发生变化时
+     */
+    public interface OnDateTimeChangedListener {
+        /**
+         * 日期时间发生变化时的回调方法
+         *
+         * @param view 触发事件的DateTimePicker实例
+         * @param year 变更后的年份
+         * @param month 变更后的月份（0-11）
+         * @param dayOfMonth 变更后的日期（1-31）
+         * @param hourOfDay 变更后的小时（0-23）
+         * @param minute 变更后的分钟（0-59）
+         */
+        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));
+    }
+    /**
+     * 主要的构造函数，完成控件的完整初始化
+     *
+     * @param context 上下文对象
+     * @param date 初始时间的时间戳
+     * @param is24HourView 是否使用24小时制显示
+     */
+    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();
+    }
+    /**
+     * 更新日期显示控件的内容
+     * 显示当前日期前后共7天的相对日期信息
+     *
+     * 实现原理：
+     * 1. 以当前日期为中心，计算前后各3天的日期范围
+     * 2. 格式化日期为"MM.dd EEEE"格式（如"12.25 星期一"）
+     * 3. 设置日期选择器的显示文本
+     *
+     * 用户体验：提供直观的相对日期参考，便于用户选择
+     */
+    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();
+    }
+    /**
+     * 更新AM/PM选择器的显示状态和值
+     * 控制AM/PM选择器的可见性和当前选中状态
+     */
+    private void updateAmPmControl() {
+        if (mIs24HourView) {
+            mAmPmSpinner.setVisibility(View.GONE);
+        } else {
+            int index = mIsAm ? Calendar.AM : Calendar.PM;
+            mAmPmSpinner.setValue(index);
+            mAmPmSpinner.setVisibility(View.VISIBLE);
+        }
+    }
+    /**
+     * 更新小时选择器的数值范围
+     * 根据当前的时间显示模式调整小时的有效范围
+     */
+    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;
+    }
+    /**
+     * 内部日期时间变更通知方法
+     * 统一处理所有日期时间组成部分变化的事件通知
+     *
+     * 设计原则：
+     * - 初始化过程中不触发事件（mInitialising标志控制）
+     * - 确保监听器不为null时才进行回调
+     * - 提供完整的日期时间信息给监听器
+     */
+    private void onDateTimeChanged() {
+        if (mOnDateTimeChangedListener != null) {
+            mOnDateTimeChangedListener.onDateTimeChanged(this, getCurrentYear(),
+                    getCurrentMonth(), getCurrentDay(), getCurrentHourOfDay(), getCurrentMinute());
+        }
+    }
+}
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/ui/DateTimePickerDialog.java b/src/Notes-master/app/src/main/java/net/micode/notes/ui/DateTimePickerDialog.java
new file mode 100644
index 0000000..1d2d40e
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/net/micode/notes/ui/DateTimePickerDialog.java
@@ -0,0 +1,278 @@
+/*
+ * 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;
+/**
+ * 日期时间选择对话框，集成DateTimePicker控件提供完整的日期时间选择解决方案
+ *
+ * 核心功能：
+ * - 封装DateTimePicker为标准的AlertDialog对话框形式
+ * - 提供确定/取消按钮完成用户交互流程
+ * - 动态更新对话框标题显示当前选择的日期时间
+ * - 支持回调接口通知选择结果
+ *
+ * 设计模式：
+ * 继承AlertDialog复用系统对话框的框架和样式
+ * 组合DateTimePicker控件实现具体的日期时间选择功能
+ * 使用回调接口模式实现与调用方的解耦通信
+ *
+ * 用户体验设计：
+ * - 标题实时反馈当前选择，提供直观的操作反馈
+ * - 支持12/24小时制自适应系统设置
+ * - 符合Android设计规范的按钮布局和交互
+ *
+ * 使用场景：
+ * 1. 便签提醒时间的设置界面
+ * 2. 需要弹出式日期时间选择的表单输入
+ * 3. 替代系统DatePickerDialog提供更统一的界面风格
+ *
+ * 注意事项：
+ * 1. 自动处理秒字段归零，确保时间精度一致性
+ * 2. 对话框标题使用系统标准日期时间格式化
+ * 3. 需要正确处理配置变更时的对话框状态保存
+ *
+ * @see AlertDialog Android警告对话框基类
+ * @see DateTimePicker 内部日期时间选择组件
+ * @see OnDateTimeSetListener 日期时间设置回调接口
+ */
+public class DateTimePickerDialog extends AlertDialog implements OnClickListener {
+    /**
+     * 当前选择的日期时间对象
+     * 使用Calendar实例维护内部日期时间状态
+     * 与DateTimePicker控件保持数据同步
+     */
+    private Calendar mDate = Calendar.getInstance();
+    /**
+     * 时间显示格式标志
+     * true表示24小时制，false表示12小时制
+     * 初始值根据系统设置自动检测
+     */
+    private boolean mIs24HourView;
+    /**
+     * 日期时间设置回调监听器
+     * 用户点击确定按钮后通过该接口通知调用方
+     * 设计模式：观察者模式，支持多个监听器注册
+     */
+    private OnDateTimeSetListener mOnDateTimeSetListener;
+    /**
+     * 日期时间选择控件实例
+     * 核心功能组件，处理具体的日期时间选择逻辑
+     * 通过setView()方法嵌入到对话框内容区域
+     */
+    private DateTimePicker mDateTimePicker;
+    /**
+     * 日期时间设置回调接口
+     * 定义用户完成日期时间选择后的通知契约
+     *
+     * 设计原则：
+     * - 接口分离：只定义必要的回调方法
+     * - 数据完整：提供完整的日期时间信息
+     * - 上下文传递：包含对话框实例便于管理
+     */
+    public interface OnDateTimeSetListener {
+        /**
+         * 用户确认日期时间选择后的回调方法
+         *
+         * @param dialog 触发事件的对话框实例，可用于对话框管理操作
+         * @param date 用户选择的日期时间（毫秒时间戳）
+         *
+         * 使用示例：
+         * dialog.setOnDateTimeSetListener(new OnDateTimeSetListener() {
+         *     public void OnDateTimeSet(AlertDialog dialog, long date) {
+         *         // 处理用户选择的日期时间
+         *         updateNoteAlertDate(date);
+         *         dialog.dismiss(); // 关闭对话框
+         *     }
+         * });
+         */
+        void OnDateTimeSet(AlertDialog dialog, long date);
+    }
+    /**
+     * 日期时间选择对话框构造函数
+     * 完成对话框的完整初始化和事件绑定
+     *
+     * 初始化流程：
+     * 1. 调用父类AlertDialog构造函数设置上下文
+     * 2. 创建DateTimePicker控件实例并设置为对话框内容视图
+     * 3. 设置日期时间变更监听器实现标题动态更新
+     * 4. 初始化内部日期时间状态和控件显示
+     * 5. 设置确定/取消按钮及点击监听器
+     * 6. 根据系统设置初始化时间显示格式
+     * 7. 设置初始对话框标题显示
+     *
+     * @param context 上下文对象，用于资源访问和控件创建
+     * @param date 初始日期时间（毫秒时间戳），使用当前时间作为默认值
+     *
+     * 技术细节：
+     * - 使用AlertDialog.Builder模式简化对话框构建
+     * - 秒字段自动设置为0，确保时间精度一致性
+     * - 支持传入历史时间或未来时间作为初始值
+     */
+    public DateTimePickerDialog(Context context, long date) {
+        super(context);
+        /**
+         * 创建日期时间选择控件实例
+         * 设计考虑：复用DateTimePicker的功能，避免重复实现
+         * 性能优化：控件创建开销小，无需延迟加载
+         */
+        mDateTimePicker = new DateTimePicker(context);
+        /**
+         * 将控件设置为对话框的内容视图
+         * 布局方式：占据对话框的主要内容区域
+         * 视觉风格：继承AlertDialog的默认样式
+         */
+        setView(mDateTimePicker);
+        /**
+         * 设置日期时间变更监听器
+         * 监听DateTimePicker的日期时间变化事件
+         * 实现标题随用户选择实时更新的交互效果
+         */
+        mDateTimePicker.setOnDateTimeChangedListener(new OnDateTimeChangedListener() {
+            /**
+             * DateTimePicker日期时间变化回调处理
+             * 同步内部日期时间状态并更新对话框标题显示
+             *
+             * @param view 触发事件的DateTimePicker实例
+             * @param year 选择的年份
+             * @param month 选择的月份（0-11）
+             * @param dayOfMonth 选择的日期（1-31）
+             * @param hourOfDay 选择的小时（0-23）
+             * @param minute 选择的分钟（0-59）
+             */
+            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());
+            }
+        });
+        // 初始化内部日期时间状态
+        mDate.setTimeInMillis(date);
+        // 秒字段归零，保持时间精度一致性
+        mDate.set(Calendar.SECOND, 0);
+        // 设置DateTimePicker的当前日期时间
+        mDateTimePicker.setCurrentDate(mDate.getTimeInMillis());
+        /**
+         * 设置对话框按钮
+         * 确定按钮：绑定当前实例作为点击监听器
+         * 取消按钮：设置为null，使用默认的关闭行为
+         */
+        setButton(context.getString(R.string.datetime_dialog_ok), this);
+        setButton2(context.getString(R.string.datetime_dialog_cancel), (OnClickListener)null);
+        /**
+         * 根据系统设置初始化时间显示格式
+         * 自适应：自动检测用户偏好（12小时制或24小时制）
+         */
+        set24HourView(DateFormat.is24HourFormat(this.getContext()));
+        // 设置初始对话框标题
+        updateTitle(mDate.getTimeInMillis());
+    }
+    /**
+     * 设置时间显示格式（12小时制/24小时制）
+     * 同时影响对话框标题和DateTimePicker的显示模式
+     *
+     * 业务逻辑：
+     * - 更新内部标志位控制显示格式
+     * - 委托给DateTimePicker控件实际切换显示模式
+     * - 下次标题更新时自动使用新格式
+     *
+     * @param is24HourView true表示使用24小时制，false表示使用12小时制
+     *
+     * 使用场景：
+     * 1. 根据系统设置自动适配
+     * 2. 用户手动切换时间显示格式
+     * 3. 特定地区或语言的格式要求
+     */
+    public void set24HourView(boolean is24HourView) {
+        mIs24HourView = is24HourView;
+    }
+    /**
+     * 设置日期时间设置回调监听器
+     * 用户完成选择后通过该监听器通知调用方
+     *
+     * 设计模式：观察者模式，支持动态注册和注销
+     * 线程安全：在主线程中调用回调方法
+     *
+     * @param callBack 日期时间设置回调接口实例，传入null可取消监听
+     */
+    public void setOnDateTimeSetListener(OnDateTimeSetListener callBack) {
+        mOnDateTimeSetListener = callBack;
+    }
+    /**
+     * 更新对话框标题显示指定的日期时间
+     * 使用系统标准日期时间格式化工具，确保格式一致性和本地化支持
+     *
+     * 格式化策略：
+     * - 显示年份、完整日期和时间信息
+     * - 根据mIs24HourView标志决定时间显示格式
+     * - 自动适配用户的语言和区域设置
+     *
+     * 技术实现：
+     * 使用DateUtils.formatDateTime()方法，该方自动处理：
+     * - 本地化格式（年月日顺序、分隔符等）
+     * - 12/24小时制转换
+     * - AM/PM符号的本地化显示
+     *
+     * @param date 要显示的日期时间（毫秒时间戳）
+     */
+    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));
+    }
+    /**
+     * 对话框按钮点击事件处理
+     * 实现OnClickListener接口，处理确定按钮的点击事件
+     *
+     * 业务逻辑：
+     * - 确定按钮：通过回调接口通知日期时间设置结果
+     * - 取消按钮：由系统自动处理，直接关闭对话框
+     *
+     * 设计考虑：
+     * 只处理确定按钮，取消按钮使用默认行为（直接关闭）
+     * 避免不必要的代码重复和逻辑复杂度
+     *
+     * @param arg0 被点击的对话框接口实例
+     * @param arg1 被点击的按钮标识
+     *             BUTTON_POSITIVE(-1)表示确定按钮
+     *             BUTTON_NEGATIVE(-2)表示取消按钮
+     */
+    public void onClick(DialogInterface arg0, int arg1) {
+        if (mOnDateTimeSetListener != null) {
+            mOnDateTimeSetListener.OnDateTimeSet(this, mDate.getTimeInMillis());
+        }
+    }
+
+}
\ No newline at end of file
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/ui/DropdownMenu.java b/src/Notes-master/app/src/main/java/net/micode/notes/ui/DropdownMenu.java
new file mode 100644
index 0000000..1d37694
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/net/micode/notes/ui/DropdownMenu.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.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;
+/**
+ * 下拉菜单封装工具类，简化PopupMenu的使用并提供统一的UI风格
+ *
+ * 核心功能：
+ * - 将Button控件转换为下拉菜单触发器
+ * - 自动管理PopupMenu的创建和显示逻辑
+ * - 提供简化的菜单项点击事件监听接口
+ * - 支持动态设置菜单标题和查找菜单项
+ *
+ * 设计目的：
+ * 解决原生PopupMenu使用复杂、样式不统一的问题
+ * 提供一致的视觉风格和交互体验
+ * 减少重复代码，提高开发效率
+ *
+ * 实现原理：
+ * 组合设计模式：封装Button和PopupMenu的协同工作
+ * 委托模式：将菜单操作委托给内部的PopupMenu实例
+ * 外观模式：提供简化的API接口隐藏实现细节
+ *
+ * 使用场景：
+ * 1. 工具栏中的操作菜单（如排序、筛选）
+ * 2. 列表项的更多操作菜单
+ * 3. 需要统一风格的下拉选择器
+ *
+ * 视觉特点：
+ * - 使用统一的下拉图标（R.drawable.dropdown_icon）
+ * - 按钮文字显示当前选择或菜单标题
+ * - 弹出菜单遵循系统主题样式
+ *
+ * 注意事项：
+ * 1. 需要传入已初始化的Button控件作为菜单触发器
+ * 2. 菜单资源文件需符合Android菜单XML规范
+ * 3. 在Activity的onDestroy中无需特殊清理
+ *
+ * @see PopupMenu Android弹出菜单组件
+ * @see Button 菜单触发按钮控件
+ */
+public class DropdownMenu {
+    private Button mButton;
+    private PopupMenu mPopupMenu;
+    private Menu mMenu;
+    /**
+     * 下拉菜单构造函数，完成菜单的初始化和事件绑定
+     *
+     * 初始化流程：
+     * 1. 保存按钮引用并设置下拉图标
+     * 2. 创建PopupMenu实例并关联到按钮
+     * 3. 从XML资源加载菜单结构
+     * 4. 设置按钮点击事件显示弹出菜单
+     *
+     * 技术细节：
+     * - 使用按钮作为锚点，菜单在按钮下方弹出
+     * - 菜单资源通过LayoutInflater动态加载
+     * - 点击事件处理确保菜单正确显示位置
+     *
+     * @param context 上下文对象，用于菜单创建和资源加载
+     * @param button 作为菜单触发器的按钮控件，必须已初始化
+     * @param menuId 菜单资源ID（R.menu.xxx），定义菜单结构和项
+     *
+     * 使用示例：
+     * Button sortButton = findViewById(R.id.sort_button);
+     * DropdownMenu dropdownMenu = new DropdownMenu(this, sortButton, R.menu.sort_options);
+     *
+     * 异常处理：
+     * - 按钮为null时抛出NullPointerException
+     * - 菜单资源不存在时抛出Resources.NotFoundException
+     */
+    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() {
+            /**
+             * 按钮点击事件处理
+             * 显示关联的弹出菜单
+             *
+             * @param v 被点击的按钮视图
+             */
+            public void onClick(View v) {
+                mPopupMenu.show();
+            }
+        });
+    }
+    /**
+     * 设置菜单项点击事件监听器
+     * 将菜单项选择事件转发给外部监听器处理
+     *
+     * 设计模式：委托模式，将事件处理委托给外部组件
+     * 使用场景：处理菜单项的业务逻辑，如排序、筛选操作
+     *
+     * @param listener 菜单项点击监听器实例
+     *                 传入null将清除现有监听器
+     * 注意事项：
+     * - 监听器应在菜单显示前设置以确保事件正确处理
+     * - 返回true表示事件已处理，false将继续传播
+     */
+    public void setOnDropdownMenuItemClickListener(OnMenuItemClickListener listener) {
+        if (mPopupMenu != null) {
+            mPopupMenu.setOnMenuItemClickListener(listener);
+        }
+    }
+    /**
+     * 根据ID查找菜单项
+     * 提供对菜单项的编程访问能力，支持动态修改
+     *
+     * 使用场景：
+     * - 动态更新菜单项状态（启用/禁用、可见性）
+     * - 根据业务逻辑修改菜单项标题
+     * - 获取菜单项的当前状态信息
+     *
+     * @param id 菜单项资源ID（R.id.xxx）
+     * @return 找到的菜单项实例，未找到时返回null
+     *
+     * 使用示例：
+     * MenuItem deleteItem = dropdownMenu.findItem(R.id.menu_delete);
+     * if (deleteItem != null) {
+     *     // 根据条件启用或禁用删除项
+     *     deleteItem.setEnabled(hasSelection);
+     * }
+     *
+     * 技术实现：
+     * 委托给内部Menu对象的findItem方法
+     * 搜索范围：当前已加载的所有菜单项
+     */
+    public MenuItem findItem(int id) {
+        return mMenu.findItem(id);
+    }
+    /**
+     * 设置下拉菜单的显示标题
+     * 更新触发按钮的文本内容，反映当前选择或菜单状态
+     *
+     * 业务逻辑：
+     * - 显示当前选择的筛选条件
+     * - 反映菜单的当前状态（如"排序方式"）
+     * - 提供用户操作的视觉反馈
+     *
+     * @param title 要显示的标题文本
+     *
+     * 使用示例：
+     * // 用户选择日期排序后更新标题
+     * dropdownMenu.setTitle("按日期排序");
+     *
+     * // 显示默认状态
+     * dropdownMenu.setTitle("选择排序方式");
+     *
+     * 设计考虑：
+     * - 标题应简洁明了，反映当前状态
+     * - 支持动态更新，适应业务逻辑变化
+     * - 文本长度适中，避免截断或布局问题
+     */
+    public void setTitle(CharSequence title) {
+        mButton.setText(title);
+    }
+}
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/ui/FoldersListAdapter.java b/src/Notes-master/app/src/main/java/net/micode/notes/ui/FoldersListAdapter.java
new file mode 100644
index 0000000..3d1bcd0
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/net/micode/notes/ui/FoldersListAdapter.java
@@ -0,0 +1,238 @@
+/*
+ * 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;
+
+/**
+ * 文件夹列表数据适配器，将文件夹数据绑定到列表视图显示
+ *
+ * 核心职责：
+ * - 管理文件夹数据的查询和显示
+ * - 处理根文件夹的特殊显示逻辑
+ * - 提供文件夹名称的按位置访问接口
+ *
+ * 设计模式：
+ * 继承CursorAdapter实现数据库游标到列表视图的数据绑定
+ * 使用内部类封装列表项视图的创建和绑定逻辑
+ * 采用ViewHolder模式优化列表滚动性能
+ *
+ * 业务特点：
+ * - 根文件夹（ID_ROOT_FOLDER）显示为"父文件夹"特殊文本
+ * - 普通文件夹显示数据库中的片段字段内容
+ * - 支持动态数据更新和列表刷新
+ *
+ * 使用场景：
+ * 1. 便签移动操作时的目标文件夹选择列表
+ * 2. 文件夹管理界面中的文件夹列表显示
+ * 3. 需要显示文件夹层次结构的任何界面
+ *
+ * 注意事项：
+ * 1. 依赖正确的游标结构（ID和SNIPPET字段）
+ * 2. 根文件夹的特殊处理逻辑不可配置
+ * 3. 列表项视图使用自定义布局文件
+ *
+ * @see CursorAdapter Android游标数据适配器基类
+ * @see FolderListItem 文件夹列表项自定义视图
+ */
+public class FoldersListAdapter extends CursorAdapter {
+    /**
+     * 文件夹查询字段投影定义
+     * 优化查询性能，只获取列表显示所需的字段
+     *
+     * 字段说明：
+     * - ID：文件夹唯一标识，用于特殊逻辑判断
+     * - SNIPPET：文件夹名称（存储在便签表的片段字段中）
+     *
+     * 设计考虑：
+     * 使用最小字段集减少内存占用和提高查询效率
+     */
+    public static final String [] PROJECTION = {
+        NoteColumns.ID,
+        NoteColumns.SNIPPET
+    };
+    /**
+     * 查询结果列索引常量
+     * 提高代码可读性，避免使用魔法数字
+     * 与PROJECTION数组定义顺序严格对应
+     */
+    public static final int ID_COLUMN   = 0;
+    public static final int NAME_COLUMN = 1;
+    /**
+     * 文件夹列表适配器构造函数
+     * 初始化游标适配器并准备数据绑定
+     *
+     * 继承行为：
+     * 调用父类CursorAdapter构造函数完成基础初始化
+     * 自动注册内容观察者监听数据变化
+     *
+     * @param context 上下文对象，用于资源访问和视图创建
+     * @param c 文件夹数据游标，应包含ID和SNIPPET字段
+     *          游标建议按文件夹名称排序以提高用户体验
+     *
+     * 使用示例：
+     * Cursor cursor = queryFolders(); // 查询文件夹数据
+     * FoldersListAdapter adapter = new FoldersListAdapter(context, cursor);
+     * listView.setAdapter(adapter);
+     *
+     * 注意事项：
+     * - 游标必须包含PROJECTION中定义的字段
+     * - 适配器不会自动管理游标的打开和关闭
+     * - 上下文泄漏风险：在Activity销毁时确保释放适配器
+     */
+    public FoldersListAdapter(Context context, Cursor c) {
+        super(context, c);
+        // TODO Auto-generated constructor stub
+    }
+    /**
+     * 创建新的列表项视图实例
+     * 在列表需要显示新项时被适配器自动调用
+     *
+     * 实现原理：
+     * 创建FolderListItem自定义视图实例
+     * 该视图封装了文件夹项的布局和样式
+     *
+     * 性能优化：
+     * - 视图创建频率较低，主要发生在列表初始化时
+     * - 实际滚动过程中主要使用convertView重用机制
+     *
+     * @param context 上下文对象，用于视图创建
+     * @param cursor 数据游标，处于正确位置指向当前数据项
+     * @param parent 父视图组，列表容器
+     * @return 创建好的文件夹列表项视图实例
+     *
+     * @see FolderListItem 自定义文件夹列表项视图
+     */
+    @Override
+    public View newView(Context context, Cursor cursor, ViewGroup parent) {
+        return new FolderListItem(context);
+    }
+    /**
+     * 将游标数据绑定到列表项视图
+     * 在列表项进入可视区域时被适配器自动调用
+     *
+     * 核心业务逻辑：
+     * - 识别根文件夹（ID_ROOT_FOLDER）并显示特殊文本
+     * - 普通文件夹显示数据库中的名称字段
+     * - 将文件夹名称设置到视图的TextView中
+     *
+     * 类型安全：
+     * 进行实例类型检查，确保视图类型正确
+     * 避免类型转换异常导致的崩溃
+     *
+     * @param view 要绑定数据的列表项视图，应为FolderListItem实例
+     * @param context 上下文对象，用于资源访问
+     * @param cursor 数据游标，已定位到要绑定的数据行
+     *
+     * 执行流程：
+     * 1. 检查视图类型是否正确
+     * 2. 从游标读取文件夹ID和名称字段
+     * 3. 根据ID判断是否为根文件夹，选择显示文本
+     * 4. 调用视图的bind方法设置显示文本
+     */
+    @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);
+        }
+    }
+    /**
+     * 根据位置获取文件夹名称
+     * 提供编程方式访问适配器数据的能力
+     *
+     * 使用场景：
+     * - 获取点击项的文件夹名称用于其他操作
+     * - 数据验证和业务逻辑处理
+     * - 调试和日志记录
+     *
+     * 实现原理：
+     * 通过位置获取游标，然后应用相同的名称解析逻辑
+     * 与bindView方法保持一致的业务规则
+     *
+     * @param context 上下文对象，用于资源字符串访问
+     * @param position 列表中的位置索引（0-based）
+     * @return 指定位置的文件夹显示名称
+     *
+     * 异常处理：
+     * - 位置越界时返回null（由getItem方法决定）
+     * - 游标访问异常由调用方处理
+     */
+    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);
+    }
+    /**
+     * 文件夹列表项自定义视图类
+     * 封装列表项的布局和数据显示逻辑
+     *
+     * 设计优势：
+     * - 将视图创建和绑定逻辑封装在独立类中
+     * - 提高代码的可读性和可维护性
+     * - 支持视图复用和性能优化
+     *
+     * 布局文件：R.layout.folder_list_item
+     * 包含一个TextView用于显示文件夹名称
+     */
+    private class FolderListItem extends LinearLayout {
+        /**
+         * 文件夹名称显示文本框
+         * 视图引用缓存，避免重复findViewById调用
+         */
+        private TextView mName;
+        /**
+         * 构造函数，完成视图的初始布局加载
+         *
+         * 实现细节：
+         * - 调用父类构造函数
+         * - 加载布局文件到当前视图
+         * - 缓存子视图引用提高性能
+         *
+         * @param context 上下文对象，用于布局加载
+         */
+        public FolderListItem(Context context) {
+            super(context);
+            inflate(context, R.layout.folder_list_item, this);
+            mName = (TextView) findViewById(R.id.tv_folder_name);
+        }
+        /**
+         * 数据绑定方法，设置文件夹显示名称
+         * 将业务数据应用到视图显示
+         *
+         * 单一职责：只负责文本显示，不包含业务逻辑
+         * 调用时机：由适配器的bindView方法调用
+         *
+         * @param name 要显示的文件夹名称
+         */
+        public void bind(String name) {
+            mName.setText(name);
+        }
+    }
+
+}
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/ui/NoteEditActivity.java b/src/Notes-master/app/src/main/java/net/micode/notes/ui/NoteEditActivity.java
new file mode 100644
index 0000000..d1ac05d
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/net/micode/notes/ui/NoteEditActivity.java
@@ -0,0 +1,1256 @@
+/*
+ * 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.database.Cursor;
+import android.graphics.Paint;
+import android.net.Uri;
+import android.os.Bundle;
+import android.os.Environment;
+import android.preference.PreferenceManager;
+import android.provider.MediaStore;
+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 java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+
+import net.micode.notes.R;
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.TextNote;
+import net.micode.notes.command.Command;
+import net.micode.notes.command.CommandManager;
+import net.micode.notes.command.TextChangeCommand;
+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;
+
+        public TextView tvWordCount;
+    }
+
+    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 CommandManager mCommandManager;
+
+    // 插入图片相关常量
+    private static final int REQUEST_CODE_PICK_IMAGE = 104;
+    private static final int REQUEST_CODE_STORAGE_PERMISSION = 105;
+    private static final String IMAGE_DIR = "notes_images";
+
+    // Custom text watcher for capturing text changes
+    private class CustomTextWatcher implements android.text.TextWatcher {
+        private String mBeforeText;
+        private boolean mIsUndoRedo = false;
+
+        public void setIsUndoRedo(boolean isUndoRedo) {
+            mIsUndoRedo = isUndoRedo;
+        }
+
+        @Override
+        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
+            mBeforeText = s.toString();
+        }
+
+        @Override
+        public void onTextChanged(CharSequence s, int start, int before, int count) {
+            // Do nothing here
+        }
+
+        @Override
+        public void afterTextChanged(android.text.Editable s) {
+            if (!mIsUndoRedo && mWorkingNote != null) {
+                String afterText = s.toString();
+                if (!mBeforeText.equals(afterText)) {
+                    Command command = new TextChangeCommand(mWorkingNote, mBeforeText, afterText);
+                    mCommandManager.executeCommand(command);
+                }
+            }
+            // Update word count whenever text changes
+            updateWordCount();
+        }
+    }
+
+    // Text watcher instance
+    private CustomTextWatcher mTextWatcher;
+
+    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();
+        mCommandManager = new CommandManager();
+    }
+
+    /**
+     * 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();
+
+        // Show title dialog only for new notes
+        if (!mWorkingNote.existInDatabase()) {
+            // Post a delayed runnable to ensure UI is fully initialized
+            mNoteEditor.postDelayed(new Runnable() {
+                @Override
+                public void run() {
+                    showSetTitleDialog();
+                }
+            }, 300);
+        }
+    }
+
+    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.tvWordCount = (TextView) findViewById(R.id.tv_word_count);
+        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);
+
+        // Create text watcher instance
+        mTextWatcher = new CustomTextWatcher();
+
+        // Add text change listener to capture text changes for undo/redo
+        mNoteEditor.addTextChangedListener(mTextWatcher);
+
+        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);
+
+        // Initialize word count
+        updateWordCount();
+    }
+
+    @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;
+    }
+
+    /**
+     * Update the word count display in the note header
+     */
+    private void updateWordCount() {
+        if (mNoteHeaderHolder == null || mNoteEditor == null) {
+            return;
+        }
+
+        String text = mNoteEditor.getText().toString();
+        // 移除图片标记，不计入字数统计
+        String textWithoutImages = text.replaceAll("\\[image:.*?\\]", "");
+        int characterCount = textWithoutImages.length();
+
+        // Update the word count display with format "***words"
+        mNoteHeaderHolder.tvWordCount.setText(String.format("%dwords", characterCount));
+    }
+
+    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);
+        }
+        if (mWorkingNote.isPasswordProtected()) {
+            menu.findItem(R.id.menu_set_password).setVisible(false);
+            menu.findItem(R.id.menu_remove_password).setVisible(true);
+        } else {
+            menu.findItem(R.id.menu_set_password).setVisible(true);
+            menu.findItem(R.id.menu_remove_password).setVisible(false);
+        }
+        return true;
+    }
+
+    /**
+     * Show dialog to set note password
+     */
+    private void showSetPasswordDialog() {
+        PasswordInputDialog dialog = new PasswordInputDialog(this, "设置密码", true, new PasswordInputDialog.OnPasswordVerifiedListener() {
+            @Override
+            public void onPasswordVerified(String password) {
+                if (mWorkingNote.setPassword(password)) {
+                    saveNote();
+                    showToast(R.string.password_set_success);
+                } else {
+                    showToast(R.string.password_set_failed);
+                }
+            }
+
+            @Override
+            public void onPasswordCanceled() {
+                // Do nothing
+            }
+        });
+        dialog.show();
+    }
+
+    /**
+     * Remove password from note
+     */
+    private void removePassword() {
+        // Show password input dialog to verify current password
+        PasswordInputDialog dialog = new PasswordInputDialog(this, "输入当前密码", new PasswordInputDialog.OnPasswordVerifiedListener() {
+            @Override
+            public void onPasswordVerified(String password) {
+                if (mWorkingNote.verifyPassword(password)) {
+                    mWorkingNote.removePassword();
+                    saveNote();
+                    showToast(R.string.password_removed);
+                } else {
+                    showToast(R.string.password_incorrect);
+                }
+            }
+
+            @Override
+            public void onPasswordCanceled() {
+                // Do nothing
+            }
+        });
+        dialog.show();
+    }
+
+    @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;
+            case R.id.menu_undo:
+                if (mCommandManager.canUndo()) {
+                    // Set flag to prevent text watcher from creating new command
+                    mTextWatcher.setIsUndoRedo(true);
+
+                    mCommandManager.undo();
+                    // Update UI after undo
+                    if (mWorkingNote.getCheckListMode() == TextNote.MODE_CHECK_LIST) {
+                        switchToListMode(mWorkingNote.getContent());
+                    } else {
+                        mNoteEditor.setText(mWorkingNote.getContent());
+                        mNoteEditor.setSelection(mNoteEditor.getText().length());
+                    }
+
+                    // Reset flag
+                    mTextWatcher.setIsUndoRedo(false);
+                }
+                break;
+            case R.id.menu_redo:
+                if (mCommandManager.canRedo()) {
+                    // Set flag to prevent text watcher from creating new command
+                    mTextWatcher.setIsUndoRedo(true);
+
+                    mCommandManager.redo();
+                    // Update UI after redo
+                    if (mWorkingNote.getCheckListMode() == TextNote.MODE_CHECK_LIST) {
+                        switchToListMode(mWorkingNote.getContent());
+                    } else {
+                        mNoteEditor.setText(mWorkingNote.getContent());
+                        mNoteEditor.setSelection(mNoteEditor.getText().length());
+                    }
+
+                    // Reset flag
+                    mTextWatcher.setIsUndoRedo(false);
+                }
+                break;
+            case R.id.menu_insert_image:
+                pickImageFromGallery();
+                break;
+            case R.id.menu_set_title:
+                showSetTitleDialog();
+                break;
+            case R.id.menu_set_password:
+                showSetPasswordDialog();
+                break;
+            case R.id.menu_remove_password:
+                removePassword();
+                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);
+        }
+        // Update word count for check list mode
+        getWorkingText();
+    }
+
+    public void onCheckListModeChanged(int oldMode, int newMode) {
+        if (newMode == TextNote.MODE_CHECK_LIST) {
+            String content = mNoteEditor.getText().toString();
+            switchToListMode(content);
+            // Update word count for check list mode
+            updateWordCountForCheckList(content);
+        } else {
+            if (!getWorkingText()) {
+                mWorkingNote.setWorkingText(mWorkingNote.getContent().replace(TAG_UNCHECKED + " ",
+                        ""));
+            }
+            mNoteEditor.setText(getHighlightQueryResult(mWorkingNote.getContent(), mUserQuery));
+            mEditTextList.setVisibility(View.GONE);
+            mNoteEditor.setVisibility(View.VISIBLE);
+            // Update word count for normal mode
+            updateWordCount();
+        }
+    }
+
+    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());
+            // Update word count for check list mode
+            updateWordCountForCheckList(sb.toString());
+        } else {
+            mWorkingNote.setWorkingText(mNoteEditor.getText().toString());
+        }
+        return hasChecked;
+    }
+
+    /**
+     * Update word count for check list mode
+     */
+    private void updateWordCountForCheckList(String text) {
+        if (mNoteHeaderHolder == null) {
+            return;
+        }
+
+        // Remove the check list tags before counting characters
+        String cleanText = text.replace(TAG_CHECKED + " ", "").replace(TAG_UNCHECKED + " ", "");
+        int characterCount = cleanText.length();
+
+        // Update the word count display with format "***words"
+        mNoteHeaderHolder.tvWordCount.setText(String.format("%dwords", characterCount));
+    }
+
+    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();
+    }
+
+    /**
+     * Show dialog to set note title
+     */
+    private void showSetTitleDialog() {
+        AlertDialog.Builder builder = new AlertDialog.Builder(this);
+        builder.setTitle(R.string.menu_set_title);
+
+        // Create EditText for title input
+        final EditText input = new EditText(this);
+        input.setSingleLine();
+        input.setHint(R.string.menu_set_title_hint);
+        input.setText(mWorkingNote.getTitle());
+        builder.setView(input);
+
+        // Set positive button
+        builder.setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
+            @Override
+            public void onClick(DialogInterface dialog, int which) {
+                String title = input.getText().toString().trim();
+                mWorkingNote.setTitle(title);
+                saveNote();
+            }
+        });
+
+        // Set negative button
+        builder.setNegativeButton(android.R.string.cancel, null);
+
+        // Show dialog
+        builder.show();
+    }
+
+    /**
+     * 打开相册选择图片
+     */
+    private void pickImageFromGallery() {
+        // 检查Android版本，根据不同版本请求不同的权限
+        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.TIRAMISU) {
+            // Android 13及以上，使用READ_MEDIA_IMAGES权限
+            if (checkSelfPermission(android.Manifest.permission.READ_MEDIA_IMAGES) == android.content.pm.PackageManager.PERMISSION_GRANTED) {
+                // 有权限，直接打开相册
+                openGallery();
+            } else {
+                // 无权限，请求权限
+                requestPermissions(new String[]{android.Manifest.permission.READ_MEDIA_IMAGES}, REQUEST_CODE_STORAGE_PERMISSION);
+            }
+        } else {
+            // Android 12及以下，使用READ_EXTERNAL_STORAGE权限
+            if (checkSelfPermission(android.Manifest.permission.READ_EXTERNAL_STORAGE) == android.content.pm.PackageManager.PERMISSION_GRANTED) {
+                // 有权限，直接打开相册
+                openGallery();
+            } else {
+                // 无权限，请求权限
+                requestPermissions(new String[]{android.Manifest.permission.READ_EXTERNAL_STORAGE}, REQUEST_CODE_STORAGE_PERMISSION);
+            }
+        }
+    }
+
+    /**
+     * 打开相册
+     */
+    private void openGallery() {
+        Intent intent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
+        startActivityForResult(intent, REQUEST_CODE_PICK_IMAGE);
+    }
+
+    /**
+     * 处理相册返回的图片
+     */
+    @Override
+    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
+        super.onActivityResult(requestCode, resultCode, data);
+        if (requestCode == REQUEST_CODE_PICK_IMAGE && resultCode == RESULT_OK && data != null) {
+            Uri imageUri = data.getData();
+            if (imageUri != null) {
+                try {
+                    // 保存图片到应用私有目录
+                    String imagePath = saveImageToPrivateDir(imageUri);
+                    if (!TextUtils.isEmpty(imagePath)) {
+                        // 在文本中插入图片标记
+                        insertImageTag(imagePath);
+                        // 更新便签内容
+                        saveNote();
+                        showToast(R.string.info_image_inserted);
+                    }
+                } catch (IOException e) {
+                    Log.e(TAG, "Error saving image: " + e.getMessage());
+                    showToast(R.string.error_image_save_failed);
+                }
+            }
+        }
+    }
+
+    /**
+     * 保存图片到应用私有目录
+     */
+    private String saveImageToPrivateDir(Uri imageUri) throws IOException {
+        // 创建应用私有目录
+        File imageDir = new File(getExternalFilesDir(Environment.DIRECTORY_PICTURES), IMAGE_DIR);
+        if (!imageDir.exists()) {
+            imageDir.mkdirs();
+        }
+
+        // 生成唯一的文件名
+        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
+        String fileName = "IMG_" + timeStamp + ".jpg";
+        File destFile = new File(imageDir, fileName);
+
+        // 从URI读取并复制图片（统一使用这种方式，兼容所有Android版本）
+        InputStream inputStream = getContentResolver().openInputStream(imageUri);
+        OutputStream outputStream = new FileOutputStream(destFile);
+
+        byte[] buffer = new byte[1024];
+        int length;
+        while ((length = inputStream.read(buffer)) > 0) {
+            outputStream.write(buffer, 0, length);
+        }
+
+        inputStream.close();
+        outputStream.close();
+
+        return IMAGE_DIR + "/" + fileName;
+    }
+
+    /**
+     * 在文本中插入图片标记
+     */
+    private void insertImageTag(String imagePath) {
+        String imageTag = "[image:" + imagePath + "]";
+        int selectionStart = mNoteEditor.getSelectionStart();
+        int selectionEnd = mNoteEditor.getSelectionEnd();
+
+        StringBuilder sb = new StringBuilder(mNoteEditor.getText().toString());
+        sb.replace(selectionStart, selectionEnd, imageTag);
+
+        mNoteEditor.setText(sb.toString());
+        mNoteEditor.setSelection(selectionStart + imageTag.length());
+    }
+
+    /**
+     * 处理权限请求结果
+     */
+    @Override
+    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
+        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
+        if (requestCode == REQUEST_CODE_STORAGE_PERMISSION) {
+            if (grantResults.length > 0 && grantResults[0] == android.content.pm.PackageManager.PERMISSION_GRANTED) {
+                // 权限被授予，打开相册
+                pickImageFromGallery();
+            } else {
+                // 权限被拒绝，显示错误消息
+                showToast(R.string.error_permission_denied);
+            }
+        }
+    }
+}
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/ui/NoteEditText.java b/src/Notes-master/app/src/main/java/net/micode/notes/ui/NoteEditText.java
new file mode 100644
index 0000000..e63a5c2
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/net/micode/notes/ui/NoteEditText.java
@@ -0,0 +1,491 @@
+/*
+ * 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.Bitmap;
+import android.graphics.BitmapFactory;
+import android.graphics.Rect;
+import android.os.Environment;
+import android.text.Layout;
+import android.text.Selection;
+import android.text.Spannable;
+import android.text.SpannableString;
+import android.text.Spanned;
+import android.text.TextUtils;
+import android.text.style.ImageSpan;
+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.io.File;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+/**
+ * 自定义便签编辑文本框，扩展Android EditText提供便签特有编辑功能
+ *
+ * 核心增强功能：
+ * - 支持清单模式下的动态项管理（添加/删除）
+ * - 智能URL链接检测和上下文菜单处理
+ * - 自定义键盘事件处理（回车键和删除键）
+ * - 焦点变化监听和文本状态跟踪
+ *
+ * 设计目的：
+ * 解决标准EditText在便签清单模式下的交互限制
+ * 提供统一的链接识别和操作体验
+ * 优化便签编辑的键盘交互流程
+ *
+ * 技术实现：
+ * 继承EditText并重写关键事件处理方法
+ * 使用接口回调模式与父Activity通信
+ * 集成Android链接识别和上下文菜单系统
+ *
+ * 使用场景：
+ * 1. 便签普通文本编辑模式
+ * 2. 清单模式下的任务项编辑
+ * 3. 包含链接的富文本便签
+ *
+ * 注意事项：
+ * 1. 必须设置OnTextViewChangeListener监听器以接收编辑事件
+ * 2. 链接检测依赖于Android标准的URLSpan识别
+ * 3. 清单模式需要配合NoteEditActivity的列表管理逻辑
+ *
+ * @see EditText Android标准编辑文本框
+ * @see URLSpan Android链接文本跨度
+ * @see OnTextViewChangeListener 文本变化监听接口
+ */
+public class NoteEditText extends EditText {
+    private static final String TAG = "NoteEditText";// 日志标签
+    /**
+     * 链接协议常量定义，用于识别和分类文本中的超链接
+     * 支持电话、网页和邮件三种常见链接类型
+     */
+    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:" ;
+    /**
+     * 链接类型与资源ID映射表
+     * 用于在上下文菜单中显示对应的操作文本
+     * 设计模式：使用映射表避免复杂的条件判断
+     */
+    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;
+    private boolean mIsEncrypted;
+    private String mOriginalText;
+
+    public NoteEditText(Context context) {
+        super(context, null);
+        mIndex = 0;
+        mIsEncrypted = false;
+        mOriginalText = "";
+    }
+
+    public NoteEditText(Context context, AttributeSet attrs) {
+        super(context, attrs, android.R.attr.editTextStyle);
+        mIsEncrypted = false;
+        mOriginalText = "";
+    }
+
+    public NoteEditText(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+        mIsEncrypted = false;
+        mOriginalText = "";
+    }
+    /**
+     * 设置编辑项在列表中的索引位置
+     * 用于标识当前编辑框在清单中的顺序位置
+     *
+     * 设计考虑：
+     * 索引从0开始，对应列表中的位置顺序
+     * 在动态添加/删除项时需要更新所有后续项的索引
+     *
+     * @param index 新的索引位置
+     */
+    public void setIndex(int index) {
+        mIndex = index;
+    }
+    /**
+     * 设置文本变化监听器
+     * 建立与父Activity的事件通信通道
+     *
+     * 注意事项：
+     * - 监听器应在编辑框使用前设置
+     * - 设置为null将取消事件监听
+     * - 建议在Activity的onCreate中设置
+     *
+     * @param listener 文本变化监听器实例
+     */
+    public void setOnTextViewChangeListener(OnTextViewChangeListener listener) {
+        mOnTextViewChangeListener = listener;
+    }
+
+    /**
+     * 设置文本并解析其中的图片标记
+     * @param text 包含图片标记的文本
+     */
+    @Override
+    public void setText(CharSequence text, BufferType type) {
+        if (text != null) {
+            // 无论是否加密，都保存原始文本
+            mOriginalText = text.toString();
+
+            if (mIsEncrypted) {
+                // 加密状态下，显示占位符
+                super.setText("[加密内容]", BufferType.NORMAL);
+            } else {
+                // 非加密状态下，解析并显示文本（包括图片）
+                SpannableString spannableString = parseImageTags(mOriginalText);
+                super.setText(spannableString, BufferType.SPANNABLE);
+            }
+        } else {
+            mOriginalText = "";
+            super.setText(text, type);
+        }
+    }
+
+    /**
+     * 设置加密状态
+     * @param isEncrypted 是否加密
+     */
+    public void setEncrypted(boolean isEncrypted) {
+        mIsEncrypted = isEncrypted;
+        // 切换加密状态时，重新设置文本以更新显示
+        if (mIsEncrypted && !mOriginalText.isEmpty()) {
+            super.setText("[加密内容]", BufferType.NORMAL);
+        } else if (!mIsEncrypted && !mOriginalText.isEmpty()) {
+            SpannableString spannableString = parseImageTags(mOriginalText);
+            super.setText(spannableString, BufferType.SPANNABLE);
+        }
+    }
+
+    /**
+     * 检查是否处于加密状态
+     * @return 是否加密
+     */
+    public boolean isEncrypted() {
+        return mIsEncrypted;
+    }
+
+    /**
+     * 获取原始文本（包括加密状态下的文本）
+     * @return 原始文本
+     */
+    public String getOriginalText() {
+        return mOriginalText;
+    }
+
+    /**
+     * 解析文本中的图片标记并替换为实际图片
+     * @param text 包含图片标记的文本
+     * @return 包含图片的SpannableString
+     */
+    private SpannableString parseImageTags(String text) {
+        SpannableString spannableString = new SpannableString(text);
+
+        // 正则表达式匹配图片标记 [image:path/to/image.jpg]
+        Pattern pattern = Pattern.compile("\\[image:(.*?)\\]");
+        Matcher matcher = pattern.matcher(text);
+
+        while (matcher.find()) {
+            String imagePath = matcher.group(1);
+            String imageTag = matcher.group(0);
+
+            // 构建完整的图片路径
+            File imageFile = new File(getContext().getExternalFilesDir(Environment.DIRECTORY_PICTURES), imagePath);
+
+            if (imageFile.exists()) {
+                // 加载图片
+                Bitmap bitmap = BitmapFactory.decodeFile(imageFile.getAbsolutePath());
+                if (bitmap != null) {
+                    // 设置图片的最大高度为15行文本，使其显示得更合适
+                    int maxHeight = getLineHeight() * 15; // 最大高度为15行文本
+                    // 对所有图片进行缩放，使其高度不超过最大高度
+                    if (bitmap.getHeight() > maxHeight) {
+                        float scale = (float) maxHeight / bitmap.getHeight();
+                        int newWidth = (int) (bitmap.getWidth() * scale);
+                        bitmap = Bitmap.createScaledBitmap(bitmap, newWidth, maxHeight, true);
+                    }
+
+                    // 创建ImageSpan并替换图片标记
+                    ImageSpan imageSpan = new ImageSpan(getContext(), bitmap);
+                    int start = matcher.start();
+                    int end = matcher.end();
+                    spannableString.setSpan(imageSpan, start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
+                }
+            }
+        }
+
+        return spannableString;
+    }
+    /**
+     * 触摸事件处理，优化文本选择体验
+     * 重写以提供更精确的光标定位功能
+     *
+     * 技术实现：
+     * 将触摸坐标转换为文本布局中的字符偏移量
+     * 使用Selection类设置精确的光标位置
+     *
+     * 用户体验改进：
+     * - 支持精确的字符级光标定位
+     * - 保持标准EditText的文本选择功能
+     * - 不影响滚动手势等常规交互
+     *
+     * @param event 触摸事件对象
+     * @return true表示事件已处理，false继续传递
+     */
+    @Override
+    public boolean onTouchEvent(MotionEvent event) {
+        // 处理其他触摸事件
+        switch (event.getAction()) {
+            case MotionEvent.ACTION_DOWN:
+                // 计算触摸点在文本中的准确位置
+                int x = (int) event.getX();
+                int y = (int) event.getY();
+                // 调整坐标，考虑内边距和滚动偏移
+                x -= getTotalPaddingLeft();
+                y -= getTotalPaddingTop();
+                x += getScrollX();
+                y += getScrollY();
+                // 获取文本布局信息
+                Layout layout = getLayout();
+                int line = layout.getLineForVertical(y);
+                int off = layout.getOffsetForHorizontal(line, x);
+                // 设置光标位置
+                Selection.setSelection(getText(), off);
+                break;
+        }
+
+        // 调用父类处理其他触摸事件（选择、滚动等）
+        return super.onTouchEvent(event);
+    }
+    /**
+     * 按键按下事件处理
+     * 捕获特定功能键的按下状态，用于后续处理
+     *
+     * 特殊处理按键：
+     * - 回车键（KEYCODE_ENTER）：标记需要处理分行逻辑
+     * - 删除键（KEYCODE_DEL）：记录删除前的光标位置
+     *
+     * 设计原理：
+     * 在onKeyDown中记录状态，在onKeyUp中执行实际操作
+     * 避免在按键按下时立即处理可能导致的交互冲突
+     *
+     * @param keyCode 按键代码
+     * @param event 按键事件对象
+     * @return true表示事件已消费，false继续传递
+     */
+    @Override
+    public boolean onKeyDown(int keyCode, KeyEvent event) {
+        switch (keyCode) {
+            case KeyEvent.KEYCODE_ENTER:
+                // 回车键：标记需要处理，但不立即执行
+                if (mOnTextViewChangeListener != null) {
+                    return false;
+                }
+                break;
+            case KeyEvent.KEYCODE_DEL:
+                // 删除键：记录删除前的光标位置
+                mSelectionStartBeforeDelete = getSelectionStart();
+                break;
+            default:
+                break;
+        }
+        return super.onKeyDown(keyCode, event);
+    }
+    /**
+     * 按键释放事件处理
+     * 执行实际的编辑操作和业务逻辑
+     *
+     * 核心业务逻辑：
+     * 删除键：当光标在开头且内容为空时删除整个编辑项
+     * 回车键：将当前内容分割，创建新的编辑项
+     *
+     * 智能处理策略：
+     * - 避免空项的无效删除操作
+     * - 支持文本内容智能分割
+     * - 保持光标位置的合理性
+     *
+     * @param keyCode 按键代码
+     * @param event 按键事件对象
+     * @return true表示事件已消费，false继续传递
+     */
+    @Override
+    public boolean onKeyUp(int keyCode, KeyEvent event) {
+        switch(keyCode) {
+            case KeyEvent.KEYCODE_DEL:
+                if (mOnTextViewChangeListener != null) {
+                    /**
+                     * 删除整个编辑项的条件：
+                     * 1. 删除前光标在文本开头（位置0）
+                     * 2. 当前不是第一个编辑项（允许删除）
+                     * 3. 监听器已正确设置
+                     */
+                    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:
+                // 回车键释放处理
+                if (mOnTextViewChangeListener != null) {
+                    int selectionStart = getSelectionStart();
+                    // 分割文本：光标前保留，光标后移动到新项
+                    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);
+    }
+    /**
+     * 焦点变化事件处理
+     * 跟踪编辑框的焦点状态变化，更新界面显示
+     *
+     * 业务逻辑：
+     * - 获得焦点时：确保操作控件可见（如果有内容）
+     * - 失去焦点时：检查内容状态，隐藏空项的操作控件
+     * - 内容变化时：实时更新操作控件的显示状态
+     *
+     * 设计考虑：
+     * 焦点变化时立即通知监听器，确保界面状态同步
+     * 避免焦点频繁切换导致的性能问题
+     *
+     * @param focused 是否获得焦点
+     * @param direction 焦点变化方向
+     * @param previouslyFocusedRect 之前获得焦点的区域
+     */
+    @Override
+    protected void onFocusChanged(boolean focused, int direction, Rect previouslyFocusedRect) {
+        if (mOnTextViewChangeListener != null) {
+            /**
+             * 文本状态检查逻辑：
+             * - 失去焦点且内容为空：隐藏操作控件
+             * - 其他情况：根据内容显示/隐藏操作控件
+             */
+            if (!focused && TextUtils.isEmpty(getText())) {
+                mOnTextViewChangeListener.onTextChange(mIndex, false);
+            } else {
+                mOnTextViewChangeListener.onTextChange(mIndex, true);
+            }
+        }
+        super.onFocusChanged(focused, direction, previouslyFocusedRect);
+    }
+    /**
+     * 创建上下文菜单（长按菜单）
+     * 智能识别文本中的链接并提供相关操作
+     *
+     * 功能特性：
+     * - 自动检测选中文本中的URL链接
+     * - 根据链接类型显示对应的操作菜单
+     * - 支持电话、网页、邮件等常见链接类型
+     *
+     * 技术实现：
+     * 使用Android标准的URLSpan识别链接
+     * 通过映射表将协议类型转换为用户友好的操作文本
+     *
+     * @param menu 上下文菜单对象
+     */
+    @Override
+    protected void onCreateContextMenu(ContextMenu menu) {
+        // 检查文本是否包含富文本样式（如链接）
+        if (getText() instanceof Spanned) {
+            int selStart = getSelectionStart();
+            int selEnd = getSelectionEnd();
+            // 计算选择范围（支持反向选择）
+            int min = Math.min(selStart, selEnd);
+            int max = Math.max(selStart, selEnd);
+            // 在选择范围内查找URL链接
+            final URLSpan[] urls = ((Spanned) getText()).getSpans(min, max, URLSpan.class);
+            // 如果选中范围内有且仅有一个链接，添加上下文菜单
+            if (urls.length == 1) {
+                int defaultResId = 0;
+                // 识别链接类型，确定对应的操作文本
+                for(String schema: sSchemaActionResMap.keySet()) {
+                    if(urls[0].getURL().indexOf(schema) >= 0) {
+                        defaultResId = sSchemaActionResMap.get(schema);
+                        break;
+                    }
+                }
+                // 未知链接类型使用默认操作
+                if (defaultResId == 0) {
+                    defaultResId = R.string.note_link_other;
+                }
+                // 添加上下文菜单项
+                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;
+                            }
+                        });
+            }
+        }
+        // 调用父类添加标准文本操作菜单（复制、粘贴等）
+        super.onCreateContextMenu(menu);
+    }
+}
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/ui/NoteItemData.java b/src/Notes-master/app/src/main/java/net/micode/notes/ui/NoteItemData.java
new file mode 100644
index 0000000..008048f
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/net/micode/notes/ui/NoteItemData.java
@@ -0,0 +1,542 @@
+/*
+ * 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;
+
+/**
+ * 便签列表项数据模型类，封装单个便签项的完整状态信息
+ *
+ * 核心职责：
+ * - 封装数据库游标到便签项数据的转换逻辑
+ * - 管理便签项在列表中的位置状态和显示属性
+ * - 提供便签类型识别和特殊业务逻辑判断
+ * - 支持通话记录便签的特定数据处理
+ *
+ * 设计模式：
+ * 采用数据模型模式，将数据库记录转换为业务对象
+ * 使用位置状态标志管理列表项的显示逻辑
+ * 通过属性方法提供类型安全的字段访问
+ *
+ * 数据流：
+ * 数据库游标 → NoteItemData实例 → 列表适配器 → 列表项视图
+ *
+ * 业务特性：
+ * - 自动清理便签片段中的清单标记符号
+ * - 智能识别通话记录便签并提取联系人信息
+ * - 动态计算便签项在列表中的相对位置状态
+ * - 支持文件夹和便签的混合列表显示
+ *
+ * 使用场景：
+ * 1. 便签列表适配器的数据源项
+ * 2. 便签搜索结果的显示数据
+ * 3. 文件夹内容列表的项数据
+ * 4. 通话记录便签的特殊处理
+ *
+ * 注意事项：
+ * 1. 构造函数完成所有数据的初始化和计算
+ * 2. 位置状态在构造时确定，后续不随游标变化
+ * 3. 通话记录便签需要联系人权限才能获取姓名
+ *
+ * @see Cursor 数据库查询结果游标
+ * @see Notes 便签数据表结构定义
+ */
+public class NoteItemData {
+    /**
+     * 便签项查询字段投影定义
+     * 优化查询性能，只获取列表显示所需的字段
+     *
+     * 字段选择原则：
+     * - 包含列表项显示必需的所有字段
+     * - 排除大文本字段（如便签内容）减少内存占用
+     * - 保持字段顺序与游标列索引严格对应
+     *
+     * 投影字段说明：
+     * ID-便签唯一标识，ALERTED_DATE-提醒时间，BG_COLOR_ID-背景颜色
+     * CREATED_DATE-创建时间，HAS_ATTACHMENT-是否有附件
+     * MODIFIED_DATE-修改时间，NOTES_COUNT-子项数量（文件夹）
+     * PARENT_ID-父文件夹ID，SNIPPET-内容片段，TYPE-便签类型
+     * WIDGET_ID-关联小组件ID，WIDGET_TYPE-小组件类型
+     */
+    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,
+            NoteColumns.PINNED_DATE,
+            NoteColumns.PASSWORD_ENCRYPTED,
+    };
+    /**
+     * 查询结果列索引常量
+     * 提高代码可读性，避免魔法数字
+     * 与PROJECTION数组定义顺序严格对应
+     */
+    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 static final int PINNED_DATE_COLUMN           = 12;
+    private static final int PASSWORD_ENCRYPTED_COLUMN    = 13;
+    // 基本属性字段
+    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 long mPinnedDate;
+    private boolean mPasswordEncrypted;
+    // 通话记录便签特殊字段
+    private String mName;
+    private String mPhoneNumber;
+    // 列表位置状态标志
+    private boolean mIsLastItem;
+    private boolean mIsFirstItem;
+    private boolean mIsOnlyOneItem;
+    private boolean mIsOneNoteFollowingFolder;
+    private boolean mIsMultiNotesFollowingFolder;
+    /**
+     * 便签项数据模型构造函数
+     * 完成数据库游标到业务对象的完整转换
+     *
+     * 初始化流程：
+     * 1. 从游标读取基本字段值
+     * 2. 处理便签片段内容的清理和格式化
+     * 3. 特殊处理通话记录便签的联系人信息
+     * 4. 计算便签项在列表中的位置状态
+     *
+     * 设计考虑：
+     * 一次性完成所有数据处理，避免后续计算开销
+     * 位置状态在构造时确定，不随游标移动变化
+     * 异常情况通过游标状态自然处理
+     *
+     * @param context 上下文对象，用于资源访问和联系人查询
+     * @param cursor 数据库查询游标，必须包含PROJECTION定义的所有字段
+     *               游标应处于有效数据行位置（moveToFirst/moveToNext后）
+     *
+     * 异常处理：
+     * - 游标字段越界：抛出IndexOutOfBoundsException
+     * - 游标已关闭：抛出IllegalStateException
+     * - 联系人权限不足：静默处理，使用电话号码作为名称
+     */
+    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);
+        mPinnedDate = cursor.getLong(PINNED_DATE_COLUMN);
+        mPasswordEncrypted = cursor.getInt(PASSWORD_ENCRYPTED_COLUMN) == 1;
+
+        mPhoneNumber = "";
+        /**
+         * 通话记录便签特殊处理
+         * 识别条件：父文件夹为通话记录文件夹（ID_CALL_RECORD_FOLDER）
+         * 处理逻辑：提取电话号码并查询联系人信息
+         */
+        if (mParentId == Notes.ID_CALL_RECORD_FOLDER) {
+            mPhoneNumber = DataUtils.getCallNumberByNoteId(context.getContentResolver(), mId);
+            if (!TextUtils.isEmpty(mPhoneNumber)) {
+                /**
+                 * 根据电话号码查询联系人姓名
+                 * 查询机制：使用Android联系人提供者查询
+                 * 回退策略：查询失败时使用电话号码作为显示名称
+                 */
+                mName = Contact.getContact(context, mPhoneNumber);
+                if (mName == null) {
+                    mName = mPhoneNumber;
+                }
+            }
+        }
+        // 确保名称字段不为null
+        if (mName == null) {
+            mName = "";
+        }
+        /**
+         * 计算便签项在列表中的位置状态
+         * 计算时机：构造函数中一次性计算，后续不再变化
+         * 设计优势：避免在列表滚动时重复计算，提升性能
+         */
+        checkPostion(cursor);
+    }
+    /**
+     * 计算便签项在列表中的位置状态
+     * 用于控制列表项的特殊显示效果和交互行为
+     *
+     * 位置状态分类：
+     * - 首项/末项/唯一项：控制圆角背景显示
+     * - 文件夹后单便签：特殊视觉分隔效果
+     * - 文件夹后多便签：组群显示效果
+     *
+     * 算法原理：
+     * 1. 使用游标方法判断绝对位置（首项、末项）
+     * 2. 向前查找判断与前一项的关系
+     * 3. 结合游标总数判断相对位置
+     *
+     * @param cursor 数据库查询游标，必须处于当前数据行位置
+     *
+     * 设计考虑：
+     * 位置状态基于当前游标位置计算，不随列表变化动态更新
+     * 适用于静态列表显示，动态列表需要重新创建数据对象
+     */
+    private void checkPostion(Cursor cursor) {
+        // 基本位置状态
+        mIsLastItem = cursor.isLast() ? true : false;
+        mIsFirstItem = cursor.isFirst() ? true : false;
+        mIsOnlyOneItem = (cursor.getCount() == 1);
+        // 初始化为false，后续条件判断设置
+        mIsMultiNotesFollowingFolder = false;
+        mIsOneNoteFollowingFolder = false;
+        /**
+         * 判断便签项是否紧跟文件夹
+         * 条件1：当前项是普通便签（非文件夹）
+         * 条件2：不是列表第一项（前面有项目）
+         * 业务场景：文件夹后的第一个便签需要特殊视觉处理
+         */
+        if (mType == Notes.TYPE_NOTE && !mIsFirstItem) {
+            int position = cursor.getPosition();
+            // 向前移动游标检查前一项类型
+            if (cursor.moveToPrevious()) {
+                /**
+                 * 前一项是文件夹或系统文件夹
+                 * 表示当前便签紧跟在文件夹后面
+                 */
+                if (cursor.getInt(TYPE_COLUMN) == Notes.TYPE_FOLDER
+                        || cursor.getInt(TYPE_COLUMN) == Notes.TYPE_SYSTEM) {
+                    /**
+                     * 判断后面是否还有更多便签
+                     * 业务规则：文件夹后有多项→组群效果，只有一项→特殊分隔效果
+                     */
+                    if (cursor.getCount() > (position + 1)) {
+                        mIsMultiNotesFollowingFolder = true;
+                    } else {
+                        mIsOneNoteFollowingFolder = true;
+                    }
+                }
+                // 恢复游标到原始位置
+                if (!cursor.moveToNext()) {
+                    throw new IllegalStateException("cursor move to previous but can't move back");
+                }
+            }
+        }
+    }
+    /**
+     * 检查是否为紧跟文件夹的单个便签
+     * 用于应用特殊的列表项视觉样式
+     *
+     * 视觉特征：
+     * - 显示顶部圆角，与文件夹视觉分离
+     * - 可能使用不同的背景强调效果
+     * - 在文件夹折叠/展开逻辑中有特殊作用
+     *
+     * @return true表示是文件夹后的唯一便签，false否则
+     */
+    public boolean isOneFollowingFolder() {
+        return mIsOneNoteFollowingFolder;
+    }
+    /**
+     * 检查是否为紧跟文件夹的多个便签之一
+     * 用于组群化显示文件夹内容
+     *
+     * 业务逻辑：
+     * - 多个便签使用连续的平直背景
+     * - 只有首项和末项显示圆角
+     * - 表示这些便签属于同一个文件夹内容
+     *
+     * @return true表示是文件夹后的多个便签之一，false否则
+     */
+    public boolean isMultiFollowingFolder() {
+        return mIsMultiNotesFollowingFolder;
+    }
+    /**
+     * 检查是否为列表最后一项
+     * 用于控制底部圆角背景的显示
+     *
+     * @return true表示是列表最后一项，false否则
+     */
+    public boolean isLast() {
+        return mIsLastItem;
+    }
+
+    public String getCallName() {
+        return mName;
+    }
+    /**
+     * 检查是否为列表第一项
+     * 用于控制顶部圆角背景的显示
+     *
+     * @return true表示是列表第一项，false否则
+     */
+    public boolean isFirst() {
+        return mIsFirstItem;
+    }
+    /**
+     * 检查是否为列表唯一项
+     * 用于显示完整的圆角背景（四角圆角）
+     *
+     * @return true表示列表中只有这一项，false否则
+     */
+    public boolean isSingle() {
+        return mIsOnlyOneItem;
+    }
+    /**
+     * 获取便签唯一标识符
+     * 用于数据库操作和详情页面跳转
+     *
+     * @return 便签在数据库中的主键ID
+     */
+    public long getId() {
+        return mId;
+    }
+    /**
+     * 获取提醒时间戳
+     * 用于判断是否显示提醒图标和时间
+     *
+     * @return 提醒时间戳（毫秒），0表示无提醒
+     */
+    public long getAlertDate() {
+        return mAlertDate;
+    }
+    /**
+     * 获取创建时间戳
+     * 用于便签排序和创建时间显示
+     *
+     * @return 便签创建时间戳（毫秒）
+     */
+    public long getCreatedDate() {
+        return mCreatedDate;
+    }
+    /**
+     * 检查便签是否有附件
+     * 用于显示附件图标提示用户
+     *
+     * @return true表示有附件，false无附件
+     */
+    public boolean hasAttachment() {
+        return mHasAttachment;
+    }
+    /**
+     * 获取最后修改时间
+     * 用于便签列表排序和修改时间显示
+     *
+     * @return 最后修改时间戳（毫秒）
+     */
+    public long getModifiedDate() {
+        return mModifiedDate;
+    }
+    /**
+     * 获取背景颜色ID
+     * 用于便签项的视觉样式设置
+     *
+     * @return 背景颜色资源ID
+     */
+    public int getBgColorId() {
+        return mBgColorId;
+    }
+
+    /**
+     * 获取父文件夹ID
+     * 用于便签的层次结构导航
+     *
+     * @return 父文件夹ID，0表示根目录
+     */
+    public long getParentId() {
+        return mParentId;
+    }
+    /**
+     * 获取便签数量（仅文件夹有效）
+     * 用于文件夹项显示包含的便签数量
+     *
+     * @return 文件夹包含的便签数量，普通便签返回0
+     */
+    public int getNotesCount() {
+        return mNotesCount;
+    }
+    /**
+     * 获取文件夹ID（ParentId的别名）
+     * 提供更语义化的访问方法
+     *
+     * @return 父文件夹ID
+     */
+    public long getFolderId () {
+        return mParentId;
+    }
+    /**
+     * 获取便签类型
+     * 用于区分普通便签、文件夹和系统文件夹
+     *
+     * @return 便签类型常量（Notes.TYPE_NOTE等）
+     */
+    public int getType() {
+        return mType;
+    }
+    /**
+     * 获取关联的小组件类型
+     * 用于小组件管理和更新
+     *
+     * @return 小组件类型常量
+     */
+    public int getWidgetType() {
+        return mWidgetType;
+    }
+
+    /**
+     * 获取关联的小组件ID
+     * 用于标识具体的桌面小组件实例
+     *
+     * @return 小组件ID，无效值表示无关联小组件
+     */
+    public int getWidgetId() {
+        return mWidgetId;
+    }
+    /**
+     * 获取便签内容片段
+     * 用于列表项的内容预览显示
+     *
+     * 内容处理：
+     * - 已清理清单标记符号（√和□）
+     * - 可能被截断以适应显示空间
+     * - 支持搜索高亮标记
+     *
+     * @return 清理后的内容片段字符串
+     */
+    public String getSnippet() {
+        return mSnippet;
+    }
+    /**
+     * 检查便签是否设置了提醒
+     * 用于控制提醒图标的显示状态
+     *
+     * 判断逻辑：
+     * 提醒时间戳大于0表示设置了有效提醒
+     * 提醒时间过期仍返回true，由UI层处理过期显示
+     *
+     * @return true表示有提醒设置，false无提醒
+     */
+    public boolean hasAlert() {
+        return (mAlertDate > 0);
+    }
+
+    /**
+     * 获取便签的置顶时间
+     * 用于便签列表的排序
+     *
+     * @return 置顶时间戳（毫秒），0表示未置顶
+     */
+    public long getPinnedDate() {
+        return mPinnedDate;
+    }
+
+    /**
+     * 检查便签是否已置顶
+     * 用于控制置顶图标的显示状态
+     *
+     * 判断逻辑：
+     * 置顶时间戳大于0表示已置顶
+     *
+     * @return true表示已置顶，false未置顶
+     */
+    public boolean isPinned() {
+        return (mPinnedDate > 0);
+    }
+
+    /**
+     * 检查是否为通话记录便签
+     * 通话记录便签有特殊的显示和处理逻辑
+     *
+     * 识别条件：
+     * 1. 父文件夹是通话记录专用文件夹
+     * 2. 关联的电话号码不为空
+     *
+     * 业务特性：
+     * - 显示联系人姓名和电话号码
+     * - 支持直接拨打关联电话
+     * - 使用特殊的图标标识
+     *
+     * @return true表示是通话记录便签，false普通便签
+     */
+    public boolean isCallRecord() {
+        return (mParentId == Notes.ID_CALL_RECORD_FOLDER && !TextUtils.isEmpty(mPhoneNumber));
+    }
+
+    /**
+     * 检查便签是否受密码保护
+     * 用于在列表中显示密码保护标记
+     *
+     * @return true表示受密码保护，false表示未加密
+     */
+    public boolean isPasswordProtected() {
+        return mPasswordEncrypted;
+    }
+    /**
+     * 从游标直接获取便签类型
+     * 工具方法，避免创建完整NoteItemData实例的类型检查
+     *
+     * 使用场景：
+     * - 快速类型过滤和分类
+     * - 游标遍历时的类型判断
+     * - 避免创建不必要的数据对象
+     *
+     * 性能优势：
+     * 直接访问游标字段，不创建完整对象
+     * 适合批量类型检查操作
+     *
+     * @param cursor 数据库查询游标，必须包含TYPE字段
+     * @return 便签类型常量
+     */
+    public static int getNoteType(Cursor cursor) {
+        return cursor.getInt(TYPE_COLUMN);
+    }
+}
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/ui/NotesListActivity.java b/src/Notes-master/app/src/main/java/net/micode/notes/ui/NotesListActivity.java
new file mode 100644
index 0000000..01afcdb
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/net/micode/notes/ui/NotesListActivity.java
@@ -0,0 +1,1374 @@
+/*
+ * 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.app.SearchManager;
+import android.appwidget.AppWidgetManager;
+import android.content.AsyncQueryHandler;
+import android.content.ContentResolver;
+import android.content.ContentUris;
+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.ImageView;
+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;
+/**
+ * 便签列表主活动，管理便签的浏览、搜索、编辑和删除等核心功能
+ *
+ * 核心功能模块：
+ * - 便签列表的展示和滚动浏览
+ * - 多选操作模式支持（批量删除、移动）
+ * - 文件夹层次导航和内容管理
+ * - 通话记录便签的特殊处理
+ * - 桌面小组件数据同步和更新
+ *
+ * 设计架构：
+ * 采用MVC模式，Activity作为Controller协调视图和数据
+ +* 使用CursorAdapter实现数据库游标到列表视图的数据绑定
+ * 通过AsyncQueryHandler处理异步数据库操作
+ *
+ * 交互特性：
+ * - 支持下拉刷新和懒加载
+ * - 多手势操作（长按多选、滑动删除）
+ * - 上下文菜单和操作模式（ActionMode）
+ * - 智能键盘管理和焦点控制
+ *
+ * 业务场景：
+ * 1. 根文件夹下的所有便签浏览
+ * 2. 子文件夹内的便签管理
+ * 3. 通话记录便签的查看和操作
+ * 4. 便签的搜索和筛选结果展示
+ *
+ * 技术实现亮点：
+ * - 使用ActionMode实现原生的多选操作界面
+ * - 通过AsyncTask处理耗时的批量操作
+ * - 集成Android的搜索框架提供全局搜索
+ * - 支持小组件的实时数据同步
+ *
+ * 注意事项：
+ * 1. 需要处理数据库查询的异步回调
+ * 2. 多选操作状态的生命周期管理
+ * 3. 列表项视图的重用和性能优化
+ * 4. 不同文件夹类型的特殊处理逻辑
+ *
+ * @see ListView Android列表视图组件
+ * @see CursorAdapter 游标数据适配器
+ * @see ActionMode 操作模式（多选界面）
+ */
+public class NotesListActivity extends Activity implements OnClickListener, OnItemLongClickListener {
+    /**
+     * 异步查询令牌常量，用于区分不同类型的数据库查询
+     * 设计目的：在异步查询回调中识别查询类型并执行相应处理
+     */
+    private static final int FOLDER_NOTE_LIST_QUERY_TOKEN = 0;
+
+    private static final int FOLDER_LIST_QUERY_TOKEN      = 1;
+    /**
+     * 上下文菜单项ID常量
+     * 用于文件夹操作的上下文菜单项标识
+     */
+    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;
+    /**
+     * 首次使用引导标记的偏好设置键
+     * 用于控制是否显示应用介绍便签
+     */
+    private static final String PREFERENCE_ADD_INTRODUCTION = "net.micode.notes.introduction";
+    /**
+     * 列表编辑状态枚举
+     * 管理活动在不同业务场景下的UI状态和行为
+     */
+    private enum ListEditState {
+        NOTE_LIST, SUB_FOLDER, CALL_RECORD_FOLDER
+    };
+    // 当前列表编辑状态
+    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;
+    // 当前浏览的文件夹ID
+    private long mCurrentFolderId;
+
+    private ContentResolver mContentResolver;
+
+    private ModeCallback mModeCallBack;
+
+    private static final String TAG = "NotesListActivity";
+
+    public static final int NOTES_LISTVIEW_SCROLL_RATE = 30;
+    // 当前获得焦点的便签数据项
+    private NoteItemData mFocusNoteDataItem;
+
+    private static final String NORMAL_SELECTION = NoteColumns.PARENT_ID + "=?";
+    /**
+     * 数据库查询条件常量
+     * 优化查询性能，使用预编译的SQL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)" + " OR ("
+            + NoteColumns.ID + "=" + Notes.ID_TRASH_FOLER + ")";
+    /**
+     * 活动请求码常量
+     * 用于startActivityForResult的结果识别
+     */
+    private final static int REQUEST_CODE_OPEN_NODE = 102;
+    private final static int REQUEST_CODE_NEW_NODE  = 103;
+    /**
+     * 活动创建初始化方法
+     * 完成界面设置、数据初始化和首次使用引导
+     */
+    @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();
+
+        // 加载保存的背景设置
+        loadSavedBackground();
+    }
+
+    private void loadSavedBackground() {
+        SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
+        int backgroundId = sp.getInt("background_id", 1);
+        applyBackground(backgroundId);
+    }
+    /**
+     * 子活动返回结果处理
+     * 处理便签编辑后的数据刷新
+     */
+    @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);
+        }
+    }
+    /**
+     * 从原始资源文件读取并创建介绍便签
+     * 只在用户第一次使用应用时执行
+     */
+    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;
+            }
+        }
+    }
+    /**
+     * 活动开始时的数据加载
+     * 确保界面可见时数据是最新的
+     */
+    @Override
+    protected void onStart() {
+        super.onStart();
+        startAsyncNotesListQuery();
+    }
+
+    @Override
+    protected void onNewIntent(Intent intent) {
+        super.onNewIntent(intent);
+        if (Intent.ACTION_SEARCH.equals(intent.getAction())) {
+            String query = intent.getStringExtra(SearchManager.QUERY);
+            // 处理搜索请求
+            Log.d(TAG, "Search query: " + query);
+            // 执行搜索查询并显示结果
+            performSearch(query);
+        }
+    }
+
+    /**
+     * 执行搜索查询并显示结果
+     * @param query 搜索关键词
+     */
+    private void performSearch(String query) {
+        if (TextUtils.isEmpty(query)) {
+            // 如果查询为空，显示所有便签
+            startAsyncNotesListQuery();
+            return;
+        }
+
+        // 构建搜索查询条件
+        String selection = NoteColumns.SNIPPET + " LIKE ?" +
+                " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER +
+                " AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE;
+        String[] selectionArgs = new String[] { "%" + query + "%" };
+
+        // 执行搜索查询
+        mBackgroundQueryHandler.startQuery(FOLDER_NOTE_LIST_QUERY_TOKEN, null,
+                Notes.CONTENT_NOTE_URI, NoteItemData.PROJECTION, selection, selectionArgs,
+                NoteColumns.MODIFIED_DATE + " DESC");
+    }
+    /**
+     * 初始化活动资源和UI组件
+     * 完成所有视图的查找和事件绑定
+     */
+    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();
+    }
+    /**
+     * 多选操作模式回调类
+     * 实现列表项的多选操作界面和功能
+     */
+    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);
+            menu.findItem(R.id.pin).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.pin:
+                    batchPin();
+                    break;
+                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;
+        }
+    }
+    /**
+     * 新建便签按钮特殊触摸监听器
+     * 处理按钮透明区域的触摸事件分发
+     */
+    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;
+        }
+
+    };
+    /**
+     * 开始异步便签列表查询
+     * 根据当前文件夹ID动态生成查询条件
+     */
+    private void startAsyncNotesListQuery() {
+        String selection;
+        String[] selectionArgs;
+
+        if (mCurrentFolderId == Notes.ID_ROOT_FOLDER) {
+            selection = ROOT_FOLDER_SELECTION;
+            selectionArgs = new String[] { String.valueOf(mCurrentFolderId) };
+        } else if (mCurrentFolderId == Notes.ID_TRASH_FOLER) {
+            // 查询回收站中的所有内容
+            selection = NoteColumns.PARENT_ID + "=?";
+            selectionArgs = new String[] { String.valueOf(mCurrentFolderId) };
+        } else {
+            selection = NORMAL_SELECTION;
+            selectionArgs = new String[] { String.valueOf(mCurrentFolderId) };
+        }
+        // 排序规则：置顶便签优先（按置顶时间倒序），然后按类型和修改时间倒序
+        mBackgroundQueryHandler.startQuery(FOLDER_NOTE_LIST_QUERY_TOKEN, null,
+                Notes.CONTENT_NOTE_URI, NoteItemData.PROJECTION, selection, selectionArgs,
+                NoteColumns.PINNED_DATE + " DESC," + NoteColumns.TYPE + " DESC," + NoteColumns.MODIFIED_DATE + " DESC");
+    }
+    /**
+     * 异步查询处理器内部类
+     * 处理数据库查询的异步执行和结果回调
+     */
+    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();
+    }
+    /**
+     * 创建新便签
+     * 启动便签编辑活动并传递当前文件夹信息
+     */
+    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);
+    }
+    /**
+     * 批量删除选中的便签
+     * 异步执行删除操作，避免阻塞UI线程
+     */
+    private void batchDelete() {
+        new AsyncTask<Void, Void, HashSet<AppWidgetAttribute>>() {
+            protected HashSet<AppWidgetAttribute> doInBackground(Void... unused) {
+                HashSet<AppWidgetAttribute> widgets = mNotesListAdapter.getSelectedWidget();
+                // 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 batchPin() {
+        new AsyncTask<Void, Void, HashSet<AppWidgetAttribute>>() {
+            protected HashSet<AppWidgetAttribute> doInBackground(Void... unused) {
+                HashSet<AppWidgetAttribute> widgets = mNotesListAdapter.getSelectedWidget();
+                if (DataUtils.batchPinNotes(mContentResolver, mNotesListAdapter.getSelectedItemIds())) {
+                    Log.d(TAG, "Pin notes success");
+                } else {
+                    Log.e(TAG, "Pin notes error");
+                }
+                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);
+                        }
+                    }
+                }
+                // 完成置顶操作后退出多选模式
+                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);
+        // 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) {
+        if (data.isPasswordProtected()) {
+            // 如果便签受密码保护，先显示密码输入对话框
+            PasswordInputDialog dialog = new PasswordInputDialog(this, "输入密码", new PasswordInputDialog.OnPasswordVerifiedListener() {
+                @Override
+                public void onPasswordVerified(String password) {
+                    // 验证密码
+                    WorkingNote note = WorkingNote.load(NotesListActivity.this, data.getId());
+                    if (note != null && note.verifyPassword(password)) {
+                        // 密码正确，打开便签
+                        Intent intent = new Intent(NotesListActivity.this, NoteEditActivity.class);
+                        intent.setAction(Intent.ACTION_VIEW);
+                        intent.putExtra(Intent.EXTRA_UID, data.getId());
+                        startActivityForResult(intent, REQUEST_CODE_OPEN_NODE);
+                    } else {
+                        // 密码错误
+                        Toast.makeText(NotesListActivity.this, R.string.password_incorrect, Toast.LENGTH_SHORT).show();
+                    }
+                }
+
+                @Override
+                public void onPasswordCanceled() {
+                    // 用户取消输入密码
+                }
+            });
+            dialog.show();
+        } else {
+            // 便签不受密码保护，直接打开
+            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;
+            case R.id.menu_change_background:
+                showBackgroundSelectionDialog();
+                break;
+            default:
+                break;
+        }
+        return true;
+    }
+
+    private int mSelectedBackgroundId = 0;
+
+    private void showBackgroundSelectionDialog() {
+        AlertDialog.Builder builder = new AlertDialog.Builder(this);
+        View view = LayoutInflater.from(this).inflate(R.layout.dialog_background_selection, null);
+        builder.setView(view);
+
+        final AlertDialog dialog = builder.create();
+
+        // 初始化背景图片
+        final ImageView background1 = view.findViewById(R.id.background_1);
+        final ImageView background2 = view.findViewById(R.id.background_2);
+        final ImageView background3 = view.findViewById(R.id.background_3);
+        final ImageView background4 = view.findViewById(R.id.background_4);
+
+        // 加载背景图片
+        background1.setImageResource(R.drawable.list_background);
+        background2.setBackgroundColor(getResources().getColor(android.R.color.holo_blue_light));
+        background3.setBackgroundColor(getResources().getColor(android.R.color.holo_green_light));
+        background4.setBackgroundColor(getResources().getColor(android.R.color.holo_purple));
+
+        // 设置背景图片点击事件
+        View.OnClickListener backgroundClickListener = new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                // 重置所有背景的边框
+                background1.setPadding(0, 0, 0, 0);
+                background2.setPadding(0, 0, 0, 0);
+                background3.setPadding(0, 0, 0, 0);
+                background4.setPadding(0, 0, 0, 0);
+
+                // 为选中的背景添加边框
+                v.setPadding(5, 5, 5, 5);
+                v.setBackgroundResource(android.R.drawable.btn_default);
+
+                // 记录选中的背景ID
+                mSelectedBackgroundId = Integer.parseInt(v.getTag().toString());
+            }
+        };
+
+        background1.setOnClickListener(backgroundClickListener);
+        background2.setOnClickListener(backgroundClickListener);
+        background3.setOnClickListener(backgroundClickListener);
+        background4.setOnClickListener(backgroundClickListener);
+
+        // 设置默认选中的背景
+        SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
+        int defaultBackgroundId = sp.getInt("background_id", 1);
+        switch (defaultBackgroundId) {
+            case 1:
+                background1.performClick();
+                break;
+            case 2:
+                background2.performClick();
+                break;
+            case 3:
+                background3.performClick();
+                break;
+            case 4:
+                background4.performClick();
+                break;
+            default:
+                background1.performClick();
+                break;
+        }
+
+        // 设置取消按钮点击事件
+        Button buttonCancel = view.findViewById(R.id.button_cancel);
+        buttonCancel.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                dialog.dismiss();
+            }
+        });
+
+        // 设置确认按钮点击事件
+        Button buttonConfirm = view.findViewById(R.id.button_confirm);
+        buttonConfirm.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                if (mSelectedBackgroundId > 0) {
+                    // 保存选中的背景设置
+                    SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(NotesListActivity.this);
+                    sp.edit().putInt("background_id", mSelectedBackgroundId).commit();
+
+                    // 应用新背景
+                    applyBackground(mSelectedBackgroundId);
+
+                    dialog.dismiss();
+                }
+            }
+        });
+
+        dialog.show();
+    }
+
+    private void applyBackground(int backgroundId) {
+        // 应用背景图片到便签选择界面
+        View rootView = (View) findViewById(R.id.notes_list).getParent().getParent();
+        switch (backgroundId) {
+            case 1:
+                rootView.setBackgroundResource(R.drawable.list_background);
+                break;
+            case 2:
+                rootView.setBackgroundColor(getResources().getColor(android.R.color.holo_blue_light));
+                break;
+            case 3:
+                rootView.setBackgroundColor(getResources().getColor(android.R.color.holo_green_light));
+                break;
+            case 4:
+                rootView.setBackgroundColor(getResources().getColor(android.R.color.holo_purple));
+                break;
+            default:
+                rootView.setBackgroundResource(R.drawable.list_background);
+                break;
+        }
+    }
+
+    @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);
+    }
+
+    /**
+     * 从回收站中还原选中的便签或文件夹
+     */
+    private void restoreFromTrash() {
+        if (mFocusNoteDataItem == null) {
+            Log.e(TAG, "No item selected for restore");
+            return;
+        }
+
+        new AsyncTask<Void, Void, Void>() {
+            @Override
+            protected Void doInBackground(Void... params) {
+                HashSet<Long> ids = new HashSet<Long>();
+                ids.add(mFocusNoteDataItem.getId());
+
+                // 查询原始父文件夹ID
+                Cursor cursor = mContentResolver.query(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, mFocusNoteDataItem.getId()),
+                        new String[]{NoteColumns.ORIGIN_PARENT_ID},
+                        null, null, null);
+
+                long originalParentId = Notes.ID_ROOT_FOLDER;
+                if (cursor != null && cursor.moveToFirst()) {
+                    originalParentId = cursor.getLong(0);
+                    cursor.close();
+                }
+
+                // 如果原始父文件夹不存在或也在回收站中，默认还原到根文件夹
+                if (originalParentId == 0 || originalParentId == Notes.ID_TRASH_FOLER) {
+                    originalParentId = Notes.ID_ROOT_FOLDER;
+                }
+
+                // 还原到原始位置
+                DataUtils.batchMoveToFolder(mContentResolver, ids, originalParentId);
+                return null;
+            }
+
+            @Override
+            protected void onPostExecute(Void result) {
+                Toast.makeText(NotesListActivity.this, "已还原", Toast.LENGTH_SHORT).show();
+                startAsyncNotesListQuery();
+            }
+        }.execute();
+    }
+
+    /**
+     * 彻底删除回收站中的便签或文件夹
+     */
+    private void permanentDelete() {
+        if (mFocusNoteDataItem == null) {
+            Log.e(TAG, "No item selected for permanent delete");
+            return;
+        }
+
+        AlertDialog.Builder builder = new AlertDialog.Builder(NotesListActivity.this);
+        builder.setTitle("彻底删除");
+        builder.setMessage("确定要彻底删除吗？此操作不可恢复。");
+        builder.setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
+            public void onClick(DialogInterface dialog, int which) {
+                new AsyncTask<Void, Void, Void>() {
+                    @Override
+                    protected Void doInBackground(Void... params) {
+                        HashSet<Long> ids = new HashSet<Long>();
+                        ids.add(mFocusNoteDataItem.getId());
+                        // 彻底删除
+                        DataUtils.batchDeleteNotes(mContentResolver, ids);
+                        return null;
+                    }
+
+                    @Override
+                    protected void onPostExecute(Void result) {
+                        Toast.makeText(NotesListActivity.this, "已彻底删除", Toast.LENGTH_SHORT).show();
+                        startAsyncNotesListQuery();
+                    }
+                }.execute();
+            }
+        });
+        builder.setNegativeButton(android.R.string.cancel, null);
+        builder.show();
+    }
+
+    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();
+
+            // 如果当前在回收站中，显示还原和彻底删除选项
+            if (mCurrentFolderId == Notes.ID_TRASH_FOLER) {
+                AlertDialog.Builder builder = new AlertDialog.Builder(NotesListActivity.this);
+                builder.setTitle("操作选项");
+                String[] items = {"还原", "彻底删除"};
+                builder.setItems(items, new DialogInterface.OnClickListener() {
+                    public void onClick(DialogInterface dialog, int which) {
+                        if (which == 0) {
+                            // 还原操作
+                            restoreFromTrash();
+                        } else if (which == 1) {
+                            // 彻底删除操作
+                            permanentDelete();
+                        }
+                    }
+                });
+                builder.show();
+                return true;
+            } else 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;
+    }
+}
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/ui/NotesListAdapter.java b/src/Notes-master/app/src/main/java/net/micode/notes/ui/NotesListAdapter.java
new file mode 100644
index 0000000..78e57bd
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/net/micode/notes/ui/NotesListAdapter.java
@@ -0,0 +1,406 @@
+/*
+ * 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;
+
+/**
+ * 便签列表数据适配器，扩展CursorAdapter实现数据库游标到列表视图的数据绑定
+ *
+ * 核心功能：
+ * - 管理便签列表项的视图创建和数据绑定
+ * - 支持多选操作模式下的选择状态管理
+ * - 提供批量操作的数据查询和状态跟踪
+ * - 处理小组件关联数据的提取和更新
+ *
+ * 设计模式：
+ * 继承CursorAdapter实现标准的数据适配器模式
+ * 使用ViewHolder模式优化列表项性能
+ * 采用选择状态映射表管理多选操作
+ *
+ * 业务特性：
+ * - 智能计算便签数量（排除文件夹项）
+ * - 支持全选/取消全选操作
+ * - 提供选择项ID集合用于批量操作
+ * - 自动处理数据变化时的数量重新计算
+ *
+ * 技术实现：
+ * - 使用HashMap维护选择状态，提高查找效率
+ * - 通过游标位置索引实现快速项访问
+ * - 支持异步数据更新和界面刷新
+ * - 集成小组件属性管理
+ *
+ * 使用场景：
+ * 1. 便签列表视图的数据源适配
+ * 2. 多选操作模式下的选择状态管理
+ * 3. 批量删除、移动操作的数据准备
+ * 4. 小组件数据同步的状态跟踪
+ *
+ * 注意事项：
+ * 1. 选择状态基于游标位置，数据变化后需要重新建立映射
+ * 2. 便签数量计算排除文件夹类型项
+ * 3. 小组件数据需要正确的权限才能访问
+ *
+ * @see CursorAdapter Android游标数据适配器基类
+ * @see NotesListItem 便签列表项自定义视图
+ * @see NoteItemData 便签数据模型类
+ */
+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;
+    /**
+     * 小组件属性内部类
+     * 封装便签关联的桌面小组件信息
+     *
+     * 设计目的：
+     * - 提供类型安全的小组件属性访问
+     * - 支持批量操作时的小组件状态跟踪
+     * - 简化小组件更新操作的数据传递
+     */
+    public static class AppWidgetAttribute {
+        public int widgetId;
+        public int widgetType;
+    };
+    /**
+     * 便签列表适配器构造函数
+     * 初始化选择状态管理和上下文引用
+     *
+     * 设计考虑：
+     * 游标参数传入null，允许后续通过changeCursor方法设置
+     * 延迟游标加载提高初始化性能
+     *
+     * @param context 上下文对象，用于视图创建和资源访问
+     */
+    public NotesListAdapter(Context context) {
+        super(context, null);
+        mSelectedIndex = new HashMap<Integer, Boolean>();
+        mContext = context;
+        mNotesCount = 0;
+    }
+    /**
+     * 创建新的列表项视图实例
+     * 在列表需要显示新项时被适配器自动调用
+     *
+     * 实现原理：
+     * 创建NotesListItem自定义视图实例
+     * 该视图封装了便签项的布局和交互逻辑
+     *
+     * 性能优化：
+     * - 视图创建频率低，主要发生在列表初始化时
+     * - 实际滚动中主要依赖convertView重用机制
+     * - 自定义视图减少布局层级提升渲染性能
+     *
+     * @param context 上下文对象，用于视图创建
+     * @param cursor 数据游标，处于正确位置指向当前数据项
+     * @param parent 父视图组，列表容器
+     * @return 创建好的便签列表项视图实例
+     */
+    @Override
+    public View newView(Context context, Cursor cursor, ViewGroup parent) {
+        return new NotesListItem(context);
+    }
+    /**
+     * 数据绑定方法，将游标数据绑定到列表项视图
+     * 在列表项进入可视区域时被适配器自动调用
+     *
+     * 绑定流程：
+     * 1. 类型检查确保视图是NotesListItem实例
+     * 2. 从游标创建NoteItemData数据模型
+     * 3. 调用视图的bind方法完成数据绑定
+     * 4. 传递当前的选择模式状态
+     *
+     * 设计优势：
+     * - 类型安全：避免类型转换异常
+     * - 职责分离：数据绑定逻辑委托给视图自身
+     * - 状态同步：确保界面显示与数据状态一致
+     *
+     * @param view 要绑定数据的列表项视图，应为NotesListItem实例
+     * @param context 上下文对象，用于资源访问
+     * @param cursor 数据游标，已定位到要绑定的数据行
+     */
+    @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()));
+        }
+    }
+    /**
+     * 设置列表项的选择状态
+     * 用于多选操作模式下更新项的选中/取消选中状态
+     *
+     * 业务逻辑：
+     * - 更新选择状态映射表中的项状态
+     * - 触发界面刷新显示新的选择状态
+     * - 支持单选和多选操作模式
+     *
+     * 性能考虑：
+     * 使用HashMap存储选择状态，O(1)时间复杂度的查找和更新
+     * 只刷新变化的项，避免整个列表重绘
+     *
+     * @param position 列表中的位置索引（0-based）
+     * @param checked 是否选中（true选中，false取消选中）
+     */
+    public void setCheckedItem(final int position, final boolean checked) {
+        mSelectedIndex.put(position, checked);
+        notifyDataSetChanged();
+    }
+    /**
+     * 检查是否处于多选操作模式
+     * 用于控制列表项的交互行为和显示样式
+     *
+     * 使用场景：
+     * - 列表项根据模式显示/隐藏选择框
+     * - 控制点击和长按事件的不同行为
+     * - 更新操作栏的多选相关功能
+     *
+     * @return true表示处于多选模式，false普通模式
+     */
+    public boolean isInChoiceMode() {
+        return mChoiceMode;
+    }
+    /**
+     * 设置选择模式状态
+     * 切换普通浏览模式和多选操作模式
+     *
+     * 模式切换逻辑：
+     * - 进入多选模式：清空之前的选择状态
+     * - 退出多选模式：保留选择状态但隐藏UI
+     * - 模式变化时触发界面刷新
+     *
+     * @param mode 选择模式状态（true多选模式，false普通模式）
+     */
+    public void setChoiceMode(boolean mode) {
+        mSelectedIndex.clear();
+        mChoiceMode = mode;
+    }
+    /**
+     * 全选或取消全选所有便签项
+     * 提供一键选择/取消选择的便捷操作
+     *
+     * 实现策略：
+     * 遍历所有便签类型项（排除文件夹），设置统一的选择状态
+     * 只处理普通便签，忽略文件夹和系统项
+     *
+     * 性能优化：
+     * 批量更新选择状态，减少不必要的界面刷新
+     * 使用游标遍历确保数据一致性
+     *
+     * @param checked 选择状态（true全选，false取消全选）
+     */
+    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);
+                }
+            }
+        }
+    }
+    /**
+     * 获取选中项的ID集合
+     * 用于批量操作（删除、移动）的数据准备
+     *
+     * 数据验证：
+     * - 排除根文件夹ID（非法操作目标）
+     * - 确保ID在数据库中存在且有效
+     * - 使用HashSet避免重复ID
+     *
+     * @return 选中便签的ID集合，空集合表示没有选中项
+     */
+    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;
+    }
+    /**
+     * 获取选中项关联的小组件属性集合
+     * 用于批量操作时更新相关的桌面小组件
+     *
+     * 业务需求：
+     * 便签删除或移动时需要更新关联的小组件显示
+     * 避免出现无效或过时的小组件内容
+     *
+     * 注意事项：
+     * - 不关闭游标，由适配器统一管理游标生命周期
+     * - 只处理有效的小组件ID和类型
+     * - 返回null表示操作过程中发生错误
+     *
+     * @return 小组件属性集合，null表示发生错误
+     */
+    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;
+    }
+    /**
+     * 获取当前选中项的数量
+     * 用于更新界面显示和操作按钮状态
+     *
+     * 实现方式：
+     * 遍历选择状态映射表的值集合，统计选中状态为true的数量
+     * 使用迭代器避免创建临时集合的开销
+     *
+     * @return 选中项的数量，0表示没有选中项
+     */
+    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;
+    }
+    /**
+     * 检查是否所有便签项都被选中
+     * 用于全选/取消全选功能的状态判断
+     *
+     * 判断逻辑：
+     * 选中数量等于便签总数且不为0时表示全选
+     * 排除文件夹项，只计算普通便签数量
+     *
+     * @return true表示全部选中，false有未选中项
+     */
+    public boolean isAllSelected() {
+        int checkedCount = getSelectedCount();
+        return (checkedCount != 0 && checkedCount == mNotesCount);
+    }
+    /**
+     * 检查指定位置的项是否被选中
+     * 用于列表项视图的状态显示更新
+     *
+     * 空值安全处理：
+     * 使用null检查避免空指针异常
+     * 未设置的项默认返回false（未选中）
+     *
+     * @param position 要检查的列表位置索引
+     * @return true表示该项被选中，false未选中
+     */
+    public boolean isSelectedItem(final int position) {
+        if (null == mSelectedIndex.get(position)) {
+            return false;
+        }
+        return mSelectedIndex.get(position);
+    }
+    /**
+     * 数据内容变化回调处理
+     * 当底层数据发生变化时自动调用
+     *
+     * 触发场景：
+     * - 数据库内容变化通知
+     * - 游标数据更新事件
+     * - 外部数据变更通知
+     *
+     * 业务逻辑：
+     * 重新计算便签数量，确保统计准确性
+     * 调用父类处理标准的数据变化逻辑
+     */
+    @Override
+    protected void onContentChanged() {
+        super.onContentChanged();
+        calcNotesCount();
+    }
+    /**
+     * 游标变更处理方法
+     * 切换数据源时更新适配器状态
+     *
+     * 执行流程：
+     * 1. 调用父类方法完成游标切换
+     * 2. 清空选择状态映射表（游标位置变化）
+     * 3. 重新计算便签数量
+     *
+     * @param cursor 新的数据游标，null表示清空数据
+     */
+    @Override
+    public void changeCursor(Cursor cursor) {
+        super.changeCursor(cursor);
+        calcNotesCount();
+    }
+    /**
+     * 计算便签数量（排除文件夹项）
+     * 统计列表中普通便签类型的项数量
+     *
+     * 统计规则：
+     * - 只计算TYPE_NOTE类型的项
+     * - 排除TYPE_FOLDER和TYPE_SYSTEM类型
+     * - 用于全选功能的数量基准
+     */
+    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;
+            }
+        }
+    }
+}
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/ui/NotesListItem.java b/src/Notes-master/app/src/main/java/net/micode/notes/ui/NotesListItem.java
new file mode 100644
index 0000000..b0b7c9b
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/net/micode/notes/ui/NotesListItem.java
@@ -0,0 +1,299 @@
+/*
+ * 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;
+
+/**
+ * 便签列表项自定义视图，管理单个便签项在列表中的显示和交互
+ *
+ * 核心职责：
+ * - 根据便签数据类型动态配置显示布局和样式
+ * - 处理多选模式下的选择框显示和状态同步
+ * - 自适应不同便签类型（普通便签、文件夹、通话记录）的视觉差异
+ * - 智能计算和设置列表项的背景视觉效果
+ *
+ * 设计架构：
+ * 继承LinearLayout实现自定义列表项视图
+ * 采用数据绑定模式将NoteItemData模型与UI组件关联
+ * 支持视图重用和状态保持优化列表滚动性能
+ *
+ * 视图特性：
+ * - 多状态显示：标题、时间、提醒图标、联系人姓名
+ * - 自适应布局：根据便签类型动态显示/隐藏组件
+ * - 视觉层次：通过文字样式和图标区分重要信息
+ * - 交互反馈：选择状态视觉反馈和点击响应
+ *
+ * 业务场景支持：
+ * 1. 普通文本便签的简洁显示
+ * 2. 文件夹项的容量统计显示
+ * 3. 通话记录便签的联系人信息集成
+ * 4. 提醒便签的时钟图标提示
+ * 5. 多选操作模式的选择框交互
+ *
+ * 技术实现亮点：
+ * - 条件渲染：根据数据类型智能配置视图组件
+ * - 样式继承：使用Android文本外观资源保持视觉一致性
+ * - 资源优化：按需加载图标和背景资源减少内存占用
+ * - 状态管理：维护数据引用支持后续操作
+ *
+ * 布局文件：R.layout.note_item
+ * 包含标题、时间、提醒图标、联系人姓名和选择框等组件
+ *
+ * 注意事项：
+ * 1. 视图重用需确保状态完全重置
+ * 2. 资源加载应考虑性能影响
+ * 3. 数据类型判断需覆盖所有边界情况
+ * 4. 选择模式切换时需更新视觉状态
+ *
+ * @see LinearLayout 线性布局基类
+ * @see NoteItemData 便签数据模型
+ * @see Notes 便签类型常量定义
+ */
+public class NotesListItem extends LinearLayout {
+    private ImageView mAlert;
+    private TextView mTitle;
+    private TextView mTime;
+    private TextView mCallName;
+    private NoteItemData mItemData;
+    private CheckBox mCheckBox;
+    /**
+     * 列表项视图构造函数
+     * 完成视图布局加载和组件初始化
+     *
+     * 初始化流程：
+     * 1. 调用父类构造函数设置上下文和属性
+     * 2. 从布局文件加载视图结构
+     * 3. 查找并缓存所有子组件引用
+     * 4. 设置视图的初始状态
+     *
+     * 技术实现：
+     * 使用inflate方法将XML布局实例化为视图对象
+     * 通过findViewById缓存组件引用提升访问性能
+     * 使用android.R.id.checkbox确保选择框兼容性
+     *
+     * 性能优化：
+     * - 布局加载一次完成，避免重复inflate开销
+     * - 组件引用缓存，减少findViewById调用
+     * - 初始状态设置，确保视图一致性
+     *
+     * @param context 上下文对象，用于资源访问和视图创建
+     *                必须为Activity上下文以支持正确的主题应用
+     *
+     * 布局文件说明：R.layout.note_item
+     * 采用垂直线性布局，包含标题、时间、联系人姓名等文本视图
+     * 提醒图标和选择框使用相对布局定位
+     */
+    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);
+    }
+    /**
+     * 数据绑定方法，将便签数据模型与UI组件关联
+     * 根据便签类型和状态动态配置视图显示
+     *
+     * 绑定策略：
+     * 1. 处理选择模式下的选择框显示逻辑
+     * 2. 根据便签类型应用不同的显示模板
+     * 3. 设置时间、提醒状态等动态内容
+     * 4. 配置视觉样式和背景效果
+     *
+     * 业务逻辑分层：
+     * - 通话记录文件夹：特殊图标和统计信息显示
+     * - 通话记录便签：联系人姓名和通话信息
+     * - 普通文件夹：文件数量统计显示
+     * - 普通便签：内容摘要和提醒状态
+     *
+     * @param context 上下文对象，用于资源访问和字符串格式化
+     * @param data 便签数据模型，包含所有显示所需信息
+     * @param choiceMode 是否处于多选操作模式
+     * @param checked 当前项是否被选中（多选模式下有效）
+     *
+     * 设计原则：
+     * - 条件判断顺序按业务优先级排列
+     * - 每种便签类型有独立的显示逻辑
+     * - 保持代码可读性和可维护性
+     */
+    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;
+        /**
+         * 系统文件夹特殊处理
+         * 识别条件：便签ID为系统文件夹常量
+         * 显示特性：固定图标、文件夹名称和文件数量统计
+         */
+        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.getId() == Notes.ID_TRASH_FOLER) {
+            mCallName.setVisibility(View.GONE);
+            mAlert.setVisibility(View.VISIBLE);
+            mTitle.setTextAppearance(context, R.style.TextAppearancePrimaryItem);
+            mTitle.setText("回收站"
+                    + context.getString(R.string.format_folder_files_count, data.getNotesCount()));
+            mAlert.setImageResource(R.drawable.delete);
+        }
+        /**
+         * 通话记录便签处理
+         * 识别条件：父文件夹为通话记录文件夹
+         * 显示特性：联系人姓名、内容摘要、提醒状态
+         */else if (data.getParentId() == Notes.ID_CALL_RECORD_FOLDER) {
+            mCallName.setVisibility(View.VISIBLE);
+            mCallName.setText(data.getCallName());
+            mTitle.setTextAppearance(context,R.style.TextAppearanceSecondaryItem);
+            // 通话记录便签：添加置顶标记
+            String title = DataUtils.getFormattedSnippet(data.getSnippet());
+            if (data.isPinned()) {
+                title = "* " + title;
+            }
+            mTitle.setText(title);
+            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) {
+                // 文件夹：添加置顶标记
+                String title = data.getSnippet()
+                        + context.getString(R.string.format_folder_files_count,
+                        data.getNotesCount());
+                if (data.isPinned()) {
+                    title = "* " + title;
+                }
+                mTitle.setText(title);
+                mAlert.setVisibility(View.GONE);
+            } else {
+                // 普通便签：添加置顶标记
+                String title = DataUtils.getFormattedSnippet(data.getSnippet());
+                if (data.isPinned()) {
+                    title = "* " + title;
+                }
+                mTitle.setText(title);
+                if (data.hasAlert()) {
+                    mAlert.setImageResource(R.drawable.clock);
+                    mAlert.setVisibility(View.VISIBLE);
+                } else if (data.isPasswordProtected()) {
+                    // 如果便签受密码保护，显示锁图标
+                    mAlert.setImageResource(android.R.drawable.ic_lock_lock); // 使用系统内置的锁图标
+                    mAlert.setVisibility(View.VISIBLE);
+                } else if (title.contains("[image:")) {
+                    // 如果便签包含图片标记，显示图片图标
+                    mAlert.setImageResource(android.R.drawable.ic_menu_gallery); // 使用系统内置的图片图标
+                    mAlert.setVisibility(View.VISIBLE);
+                } else {
+                    mAlert.setVisibility(View.GONE);
+                }
+            }
+        }
+        mTime.setText(DateUtils.getRelativeTimeSpanString(data.getModifiedDate()));
+
+        setBackground(data);
+    }
+    /**
+     * 设置列表项背景样式
+     * 根据便签位置和类型智能选择背景资源
+     *
+     * 背景选择策略：
+     * - 普通便签：根据在列表中的位置选择圆角背景
+     * - 文件夹：使用统一的文件夹背景样式
+     * - 位置感知：首项、末项、中间项不同视觉效果
+     *
+     * 视觉设计原则：
+     * - 首项：顶部圆角，底部直角（列表开始）
+     * - 末项：顶部直角，底部圆角（列表结束）
+     * - 单一项：四角圆角（独立显示）
+     * - 中间项：直角矩形（连续列表）
+     * - 文件夹后便签：特殊分隔效果
+     *
+     * @param data 便签数据模型，包含位置状态和类型信息
+     *
+     * 用户体验优化：
+     * - 圆角背景提供视觉分组和层次感
+     * - 颜色区分增强便签类型识别
+     * - 平滑过渡避免视觉突兀
+     */
+    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());
+        }
+    }
+    /**
+     * 获取当前绑定的便签数据模型
+     * 提供对绑定数据的只读访问接口
+     *
+     * 使用场景：
+     * - 列表项点击事件处理时获取便签ID
+     * - 长按操作时访问便签详细信息
+     * - 多选操作时验证便签类型和状态
+     *
+     * 设计考虑：
+     * 返回数据模型引用，避免不必要的对象复制
+     * 调用方应遵守只读原则，不修改数据内容
+     *
+     * @return 当前绑定的NoteItemData实例，可能为null（未绑定状态）
+     *
+     * 注意事项：
+     * 1. 在调用bind方法后返回有效数据引用
+     * 2. 视图重用时数据可能被重新绑定
+     * 3. 不应长期持有返回的数据引用
+     */
+    public NoteItemData getItemData() {
+        return mItemData;
+    }
+}
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/ui/NotesPreferenceActivity.java b/src/Notes-master/app/src/main/java/net/micode/notes/ui/NotesPreferenceActivity.java
new file mode 100644
index 0000000..ca3033c
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/net/micode/notes/ui/NotesPreferenceActivity.java
@@ -0,0 +1,503 @@
+/*
+ * 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;
+
+/**
+ * 便签应用设置活动，管理用户偏好配置和Google任务同步账户设置
+ *
+ * 核心功能模块：
+ * - 同步账户管理（添加、选择、移除Google账户）
+ * - 同步状态监控和手动同步控制
+ * - 应用偏好设置（背景颜色、显示选项等）
+ * - 最后一次同步时间记录和显示
+ *
+ * 设计架构：
+ * 继承PreferenceActivity提供标准的设置界面框架
+ * 集成AccountManager进行Google账户认证管理
+ * 通过广播接收器实时同步同步服务状态
+ * 使用SharedPreferences持久化用户配置
+ *
+ * 技术特性：
+ * - 动态账户检测：自动识别设备上的Google账户
+ * - 实时状态更新：同步进度和结果即时反馈
+ * - 数据完整性：账户变更时清理本地同步状态
+ * - 用户体验：引导式账户设置流程
+ *
+ * 业务场景：
+ * 1. 首次使用应用的账户配置引导
+ * 2. 同步账户的切换和管理
+ * 3. 手动触发数据同步操作
+ * 4. 同步状态和历史的查看
+ *
+ * 集成组件：
+ * - AccountManager：系统账户服务集成
+ * - GTaskSyncService：Google任务同步服务
+ * - SharedPreferences：配置数据持久化
+ * - BroadcastReceiver：同步状态监听
+ *
+ * 注意事项：
+ * 1. 需要GET_ACCOUNTS权限访问设备账户
+ * 2. 同步操作需要网络连接权限
+ * 3. 账户变更会清空本地同步标识
+ * 4. 设置变化立即生效，无需重启应用
+ *
+ * @see PreferenceActivity Android设置活动基类
+ * @see AccountManager 系统账户管理服务
+ * @see GTaskSyncService Google任务同步服务
+ */
+public class NotesPreferenceActivity extends PreferenceActivity {
+    /**
+     * 偏好设置文件名常量
+     * 用于SharedPreferences的文件存储标识
+     */
+    public static final String PREFERENCE_NAME = "notes_preferences";
+    /**
+     * 同步账户名称偏好键
+     * 存储用户选择的Google账户用于数据同步
+     */
+    public static final String PREFERENCE_SYNC_ACCOUNT_NAME = "pref_key_account_name";
+    /**
+     * 最后一次同步时间偏好键
+     * 记录最近成功同步的时间戳，用于状态显示
+     */
+    public static final String PREFERENCE_LAST_SYNC_TIME = "pref_last_sync_time";
+    /**
+     * 背景颜色随机显示偏好键
+     * 控制便签背景颜色是否随机生成的配置项
+     */
+    public static final String PREFERENCE_SET_BG_COLOR_KEY = "pref_key_bg_random_appear";
+    /**
+     * 同步账户设置分类键
+     * 偏好设置界面中账户分类的XML标识
+     */
+    private static final String PREFERENCE_SYNC_ACCOUNT_KEY = "pref_sync_account_key";
+    /**
+     * 账户权限过滤器键
+     * 添加账户时限制只显示Gmail相关账户类型
+     */
+    private static final String AUTHORITIES_FILTER_KEY = "authorities";
+
+    private PreferenceCategory mAccountCategory;
+
+    private GTaskReceiver mReceiver;
+
+    private Account[] mOriAccounts;
+
+    private boolean mHasAddedAccount;
+    /**
+     * 设置活动创建初始化方法
+     * 完成界面布局、广播注册和初始状态设置
+     */
+    @Override
+    protected void onCreate(Bundle icicle) {
+        super.onCreate(icicle);
+        /**
+         * 启用ActionBar的返回导航功能
+         * 用户体验：提供一致的导航模式，方便用户返回主界面
+         */
+        /* using the app icon for navigation */
+        getActionBar().setDisplayHomeAsUpEnabled(true);
+        /**
+         * 从XML资源加载偏好设置界面结构
+         * 布局文件：R.xml.preferences
+         * 包含账户设置、同步控制等配置项
+         */
+        addPreferencesFromResource(R.xml.preferences);
+        /**
+         * 初始化账户设置分类引用
+         * 用于动态管理账户相关的设置项
+         */
+        mAccountCategory = (PreferenceCategory) findPreference(PREFERENCE_SYNC_ACCOUNT_KEY);
+        /**
+         * 创建并注册同步服务广播接收器
+         * 监听同步进度和状态变化，实时更新界面
+         */
+        mReceiver = new GTaskReceiver();
+        IntentFilter filter = new IntentFilter();
+        filter.addAction(GTaskSyncService.GTASK_SERVICE_BROADCAST_NAME);
+        registerReceiver(mReceiver, filter);
+
+        mOriAccounts = null;
+        /**
+         * 添加设置界面头部视图
+         * 显示同步状态和立即同步按钮等快捷操作
+         */
+        View header = LayoutInflater.from(this).inflate(R.layout.settings_header, null);
+        getListView().addHeaderView(header, null, true);
+    }
+    /**
+     * 活动恢复时处理账户状态变化
+     * 检测新添加的账户并自动设置为同步账户
+     */
+    @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();
+    }
+    /**
+     * 活动销毁时清理资源
+     * 注销广播接收器避免内存泄漏
+     */
+    @Override
+    protected void onDestroy() {
+        if (mReceiver != null) {
+            unregisterReceiver(mReceiver);
+        }
+        super.onDestroy();
+    }
+    /**
+     * 动态加载账户偏好设置项
+     * 根据当前同步状态动态配置账户设置的交互行为
+     */
+    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));
+        /**
+         * 账户设置点击事件处理
+         * 根据当前同步状态和账户设置情况提供不同的交互流程
+         */
+        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);
+    }
+    /**
+     * 加载同步按钮状态和同步时间显示
+     * 根据同步服务状态动态更新界面控件
+     */
+    private void loadSyncButton() {
+        Button syncButton = (Button) findViewById(R.id.preference_sync_button);
+        TextView lastSyncTimeView = (TextView) findViewById(R.id.prefenerece_sync_status_textview);
+        /**
+         * 同步按钮状态配置
+         * 根据同步服务运行状态显示不同的文本和点击行为
+         */
+        // 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();
+    }
+    /**
+     * 显示账户选择对话框
+     * 列出设备上所有可用的Google账户供用户选择
+     */
+    private void showSelectAccountAlertDialog() {
+        AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);
+        /**
+         * 自定义对话框标题视图
+         * 提供更丰富的提示信息和视觉设计
+         */
+        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();
+                        }
+                    });
+        }
+        /**
+         * 添加"添加账户"选项视图
+         * 允许用户直接跳转到系统账户添加界面
+         */
+        View addAccountView = LayoutInflater.from(this).inflate(R.layout.add_account_text, null);
+        dialogBuilder.setView(addAccountView);
+
+        final AlertDialog dialog = dialogBuilder.show();
+        /**
+         * 添加账户点击处理
+         * 启动系统账户添加界面，限制只显示Gmail相关账户类型
+         */
+        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;
+        }
+    }
+}
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/ui/PasswordInputDialog.java b/src/Notes-master/app/src/main/java/net/micode/notes/ui/PasswordInputDialog.java
new file mode 100644
index 0000000..f8feb1b
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/net/micode/notes/ui/PasswordInputDialog.java
@@ -0,0 +1,155 @@
+/*
+ * 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.AlertDialog;
+import android.content.Context;
+import android.os.Bundle;
+import android.text.Editable;
+import android.text.TextWatcher;
+import android.view.View;
+import android.view.WindowManager;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import net.micode.notes.R;
+import net.micode.notes.tool.PasswordUtils;
+
+public class PasswordInputDialog {
+    private static final String TAG = "PasswordInputDialog";
+    private static final int MAX_PASSWORD_LENGTH = 6;
+    private static final int MIN_PASSWORD_LENGTH = 4;
+
+    private Context mContext;
+    private OnPasswordVerifiedListener mListener;
+    private String mTitle;
+    private boolean mIsSettingMode;
+    private String mConfirmPassword;
+
+    private EditText mPasswordEditText;
+    private TextView mTitleTextView;
+    private Button mButtonCancel, mButtonConfirm;
+    private AlertDialog mDialog;
+
+    public interface OnPasswordVerifiedListener {
+        void onPasswordVerified(String password);
+        void onPasswordCanceled();
+    }
+
+    public PasswordInputDialog(Context context, String title, OnPasswordVerifiedListener listener) {
+        mContext = context;
+        mTitle = title;
+        mListener = listener;
+        mIsSettingMode = false;
+    }
+
+    public PasswordInputDialog(Context context, String title, boolean isSettingMode, OnPasswordVerifiedListener listener) {
+        mContext = context;
+        mTitle = title;
+        mIsSettingMode = isSettingMode;
+        mListener = listener;
+    }
+
+    public void show() {
+        AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
+        View view = View.inflate(mContext, R.layout.dialog_password, null);
+        builder.setView(view);
+
+        mDialog = builder.create();
+        mDialog.setCancelable(false);
+        mDialog.setCanceledOnTouchOutside(false);
+
+        // 设置窗口属性，防止截屏
+        if (mDialog.getWindow() != null) {
+            mDialog.getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);
+        }
+
+        initViews(view);
+        initListeners();
+
+        mDialog.show();
+    }
+
+    private void initViews(View view) {
+        mTitleTextView = view.findViewById(R.id.dialog_title);
+        mPasswordEditText = view.findViewById(R.id.password_edit);
+        mButtonCancel = view.findViewById(R.id.button_cancel);
+        mButtonConfirm = view.findViewById(R.id.button_confirm);
+
+        mTitleTextView.setText(mTitle);
+    }
+
+    private void initListeners() {
+        mButtonCancel.setOnClickListener(v -> {
+            if (mListener != null) {
+                mListener.onPasswordCanceled();
+            }
+            if (mDialog != null) {
+                mDialog.dismiss();
+            }
+        });
+
+        mButtonConfirm.setOnClickListener(v -> {
+            String password = mPasswordEditText.getText().toString();
+            if (!PasswordUtils.isValidPasswordFormat(password)) {
+                Toast.makeText(mContext, mContext.getString(R.string.password_length_error, MIN_PASSWORD_LENGTH, MAX_PASSWORD_LENGTH), Toast.LENGTH_SHORT).show();
+                return;
+            }
+
+            if (mIsSettingMode) {
+                if (mConfirmPassword == null) {
+                    // 第一次输入，保存密码并提示确认
+                    mConfirmPassword = password;
+                    mPasswordEditText.setText("");
+                    mTitleTextView.setText(mContext.getString(R.string.password_confirm_title));
+                    Toast.makeText(mContext, R.string.password_confirm_hint, Toast.LENGTH_SHORT).show();
+                } else {
+                    // 第二次输入，验证两次密码是否一致
+                    if (password.equals(mConfirmPassword)) {
+                        if (mListener != null) {
+                            mListener.onPasswordVerified(password);
+                        }
+                        if (mDialog != null) {
+                            mDialog.dismiss();
+                        }
+                    } else {
+                        Toast.makeText(mContext, R.string.password_not_match, Toast.LENGTH_SHORT).show();
+                        mConfirmPassword = null;
+                        mPasswordEditText.setText("");
+                        mTitleTextView.setText(mTitle);
+                    }
+                }
+            } else {
+                // 验证模式，直接返回密码
+                if (mListener != null) {
+                    mListener.onPasswordVerified(password);
+                }
+                if (mDialog != null) {
+                    mDialog.dismiss();
+                }
+            }
+        });
+    }
+
+    public void dismiss() {
+        if (mDialog != null) {
+            mDialog.dismiss();
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/widget/NoteWidgetProvider.java b/src/Notes-master/app/src/main/java/net/micode/notes/widget/NoteWidgetProvider.java
new file mode 100644
index 0000000..ec6f819
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/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();
+}
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/widget/NoteWidgetProvider_2x.java b/src/Notes-master/app/src/main/java/net/micode/notes/widget/NoteWidgetProvider_2x.java
new file mode 100644
index 0000000..adcb2f7
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/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;
+    }
+}
diff --git a/src/Notes-master/app/src/main/java/net/micode/notes/widget/NoteWidgetProvider_4x.java b/src/Notes-master/app/src/main/java/net/micode/notes/widget/NoteWidgetProvider_4x.java
new file mode 100644
index 0000000..c12a02e
--- /dev/null
+++ b/src/Notes-master/app/src/main/java/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;
+    }
+}