程心

MiNote

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+Subproject commit 3fc8d3cc9005df274d619f6e4efdb9626a00b5e4

data/Contact.java

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+/*
+ * 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; //声明该类属于net.micode.notes.data包
+
+import android.content.Context; //导入Context类，用于获取应用的上下文
+import android.database.Cursor; //导入Cursor类，用于处理数据库查询的结果
+import android.provider.ContactsContract.CommonDataKinds.Phone; //导入Phone类，访问联系人相关信息
+import android.provider.ContactsContract.Data; //导入Data类，用于访问数据表
+import android.telephony.PhoneNumberUtils; //导入PhoneNumberUtils类，用于处理电话号码
+import android.util.Log; //导入Log类，用于输出日志
+
+import java.util.HashMap; //导入HashMap类，用于存储电话号码和联系人名称的缓存
+
+public class Contact { //定义一个名为Contact的类
+    private static HashMap<String, String> sContactCache; //定义一个静态的HashMap，用于缓存电话号码和对应的联系人名称
+    private static final String TAG = "Contact"; //定义日志标记
+
+    //定义一个常量字符串，用于查询符合条件的联系人
+    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 = '+')";
+
+    //定义一个静态方法，用于获取联系人名称
+    public static String getContact(Context context, String phoneNumber) {
+        //如果缓存为空，则初始化缓存
+        if(sContactCache == null) {
+            sContactCache = new HashMap<String, String>();
+        }
+
+        //如果缓存中已经存在该电话号码的联系人，则直接返回缓存中的值
+        if(sContactCache.containsKey(phoneNumber)) {
+            return sContactCache.get(phoneNumber);
+        }
+
+        //使用PhoneNumberUtils将电话号码格式化为最小匹配格式
+        String selection = CALLER_ID_SELECTION.replace("+",
+                PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));
+        
+        //通过ContentResolver执行查询操作，查询联系人表中的名称
+        Cursor cursor = context.getContentResolver().query(
+                Data.CONTENT_URI, //查询Data内容提供者
+                new String [] { Phone.DISPLAY_NAME }, //查询显示名称字段
+                selection, //查询条件
+                new String[] { phoneNumber }, //查询参数，即电话号码
+                null); //排序条件为空
+
+        //如果查询结果不为空且有数据
+        if (cursor != null && cursor.moveToFirst()) {
+            try {
+                //获取联系人名称
+                String name = cursor.getString(0);
+                //将电话号码和联系人名称缓存到HashMap中
+                sContactCache.put(phoneNumber, name);
+                return name; //返回联系人名称
+            } catch (IndexOutOfBoundsException e) { //如果获取数据失败
+                Log.e(TAG, " Cursor get string error " + e.toString()); //输出错误日志
+                return null; //返回null表示未找到联系人
+            } finally { //确保查询完成后关闭游标
+                cursor.close();
+            }
+        } else { //如果没有找到联系人
+            Log.d(TAG, "No contact matched with number:" + phoneNumber); //输出日志表示没有找到匹配的联系人
+            return null; //返回null表示未找到联系人
+        }
+    }
+}

data/Notes.java

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+```java
+/*
+
+1.Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+*
+2.Licensed under the Apache License, Version 2.0 (the "License");
+3.you may not use this file except in compliance with the License.
+4.You may obtain a copy of the License at
+*
+5.http://www.apache.org/licenses/LICENSE-2.0
+*
+6.Unless required by applicable law or agreed to in writing, software
+7.distributed under the License is distributed on an "AS IS" BASIS,
+8.WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+9.See the License for the specific language governing permissions and
+10.limitations under the License.
+*/
+
+package net.micode.notes.data;  // 定义包名
+import android.net.Uri;  // 引入 Uri 类，用于处理 URI（统一资源标识符）
+public class Notes {  // 定义 Notes 类
+    public static final String AUTHORITY = "micodenotes";  // 定义授权标识符
+    public static final String TAG = "Notes";  // 定义标签用于日志记录
+    public static final int TYPENOTE     = 0;  // 定义笔记类型常量（类型为笔记）
+    public static final int TYPEFOLDER   = 1;  // 定义文件夹类型常量（类型为文件夹）
+    public static final int TYPESYSTEM   = 2;  // 定义系统类型常量（类型为系统）
+/**
+ * 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;  // 系统文件夹的根文件夹 ID
+public static final int ID_TEMPARAY_FOLDER = -1;  // 临时文件夹的 ID（用于没有文件夹的笔记）
+public static final int ID_CALL_RECORD_FOLDER = -2;  // 通话记录文件夹的 ID
+public static final int ID_TRASH_FOLER = -3;  // 回收站文件夹的 ID
+
+public static final String INTENT_EXTRA_ALERT_DATE = "net.micode.notes.alert_date";  // 提醒日期的 Intent 字段
+public static final String INTENT_EXTRA_BACKGROUND_ID = "net.micode.notes.background_color_id";  // 背景颜色 ID 的 Intent 字段
+public static final String INTENT_EXTRA_WIDGET_ID = "net.micode.notes.widget_id";  // 小部件 ID 的 Intent 字段
+public static final String INTENT_EXTRA_WIDGET_TYPE = "net.micode.notes.widget_type";  // 小部件类型的 Intent 字段
+public static final String INTENT_EXTRA_FOLDER_ID = "net.micode.notes.folder_id";  // 文件夹 ID 的 Intent 字段
+public static final String INTENT_EXTRA_CALL_DATE = "net.micode.notes.call_date";  // 通话日期的 Intent 字段
+
+public static final int TYPE_WIDGET_INVALIDE      = -1;  // 小部件无效类型
+public static final int TYPE_WIDGET_2X            = 0;   // 小部件 2x 类型
+public static final int TYPE_WIDGET_4X            = 1;   // 小部件 4x 类型
+
+public static class DataConstants {  // 定义数据常量类
+    public static final String NOTE = TextNote.CONTENT_ITEM_TYPE;  // 文字笔记的内容类型常量
+    public static final String CALL_NOTE = CallNote.CONTENT_ITEM_TYPE;  // 通话笔记的内容类型常量
+}
+
+/**
+ * Uri to query all notes and folders
+ */
+public static final Uri CONTENT_NOTE_URI = Uri.parse("content://" + AUTHORITY + "/note");  // 用于查询所有笔记和文件夹的 URI
+
+/**
+ * Uri to query data
+ */
+public static final Uri CONTENT_DATA_URI = Uri.parse("content://" + AUTHORITY + "/data");  // 用于查询数据的 URI
+
+public interface NoteColumns {  // 定义笔记相关列的接口
+    /**
+     * The unique ID for a row
+     * <P> Type: INTEGER (long) </P>
+     */
+    public static final String ID = "_id";  // 行的唯一 ID，类型为整型（long）
+
+    /**
+     * The parent's id for note or folder
+     * <P> Type: INTEGER (long) </P>
+     */
+    public static final String PARENT_ID = "parent_id";  // 笔记或文件夹的父级 ID，类型为整型（long）
+
+    /**
+     * Created data for note or folder
+     * <P> Type: INTEGER (long) </P>
+     */
+    public static final String CREATED_DATE = "created_date";  // 创建日期，类型为整型（long）
+
+    /**
+     * Latest modified date
+     * <P> Type: INTEGER (long) </P>
+     */
+    public static final String MODIFIED_DATE = "modified_date";  // 最新修改日期，类型为整型（long）
+
+
+    /**
+     * Alert date
+     * <P> Type: INTEGER (long) </P>
+     */
+    public static final String ALERTED_DATE = "alert_date";  // 提醒日期，类型为整型（long）
+
+    /**
+     * Folder's name or text content of note
+     * <P> Type: TEXT </P>
+     */
+    public static final String SNIPPET = "snippet";  // 文件夹的名称或笔记的文本内容，类型为文本
+
+    /**
+     * Note's widget id
+     * <P> Type: INTEGER (long) </P>
+     */
+    public static final String WIDGET_ID = "widget_id";  // 笔记的小部件 ID，类型为整型（long）
+
+    /**
+     * Note's widget type
+     * <P> Type: INTEGER (long) </P>
+     */
+    public static final String WIDGET_TYPE = "widget_type";  // 笔记的小部件类型，类型为整型（long）
+
+    /**
+     * Note's background color's id
+     * <P> Type: INTEGER (long) </P>
+     */
+    public static final String BG_COLOR_ID = "bg_color_id";  // 笔记的背景颜色 ID，类型为整型（long）
+
+    /**
+     * 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";  // 笔记是否有附件，类型为整型
+
+    /**
+     * Folder's count of notes
+     * <P> Type: INTEGER (long) </P>
+     */
+    public static final String NOTES_COUNT = "notes_count";  // 文件夹中的笔记数量，类型为整型（long）
+
+    /**
+     * The file type: folder or note
+     * <P> Type: INTEGER </P>
+     */
+    public static final String TYPE = "type";  // 文件类型：文件夹或笔记，类型为整型
+
+    /**
+     * The last sync id
+     * <P> Type: INTEGER (long) </P>
+     */
+    public static final String SYNC_ID = "sync_id";  // 最后同步 ID，类型为整型（long）
+
+    /**
+     * Sign to indicate local modified or not
+     * <P> Type: INTEGER </P>
+     */
+    public static final String LOCAL_MODIFIED = "local_modified";  // 标识本地是否有修改，类型为整型
+
+    /**
+     * Original parent id before moving into temporary folder
+     * <P> Type : INTEGER </P>
+     */
+    public static final String ORIGIN_PARENT_ID = "origin_parent_id";  // 原始父级 ID（在移动到临时文件夹之前），类型为整型
+
+    /**
+     * The gtask id
+     * <P> Type : TEXT </P>
+     */
+    public static final String GTASK_ID = "gtask_id";  // Google 任务 ID，类型为文本
+
+    /**
+     * The version code
+     * <P> Type : INTEGER (long) </P>
+     */
+    public static final String VERSION = "version";  // 版本号，类型为整型（long）
+}
+
+public interface DataColumns {  // 定义数据相关列的接口
+    /**
+     * The unique ID for a row
+     * <P> Type: INTEGER (long) </P>
+     */
+    public static final String ID = "_id";  // 行的唯一 ID，类型为整型（long）
+
+    /**
+     * The MIME type of the item represented by this row.
+     * <P> Type: Text </P>
+     */
+    public static final String MIME_TYPE = "mime_type";  // MIME 类型，类型为文本
+
+    /**
+     * The reference id to note that this data belongs to
+     * <P> Type: INTEGER (long) </P>
+     */
+    public static final String NOTE_ID = "note_id";  // 该数据所属的笔记的 ID，类型为整型（long）
+
+    /**
+     * Created data for note or folder
+     * <P> Type: INTEGER (long) </P>
+     */
+    public

data/NotesDatabaseHelper.java

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+/*
+ * 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 {
+//  数据库帮助类，用于管理名为 note.db 的 SQLite 数据库。
+//  它继承自 SQLiteOpenHelper 类，这是 Android提供的一个方便的工具类，用于管理数据库的创建和版本更新.    
+    // 数据库的基本信息；数据库名称和版本信息（在创建实例对象时会用到）
+    private static final String DB_NAME = "note.db";
+
+    private static final int DB_VERSION = 5;
+    // 内部接口：个人理解为两个表名，一个note，一个data
+    public interface TABLE {
+        public static final String NOTE = "note";
+
+        public static final String DATA = "data";
+    }
+    // 一个标签，方便日志输出时识别出信息来自哪里
+    private static final String TAG = "NotesDatabaseHelper";
+
+    private static NotesDatabaseHelper mInstance;
+    /* 以下都是一些SQL语句，辅助我们来对数据库进行操作 */
+    // 创建note表的语句，这里的NoteColumns就是我们刚刚在Notes中定义的一个接口，里面定义了一系列静态的数据库表中的列名
+    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.PASSWORD + " TEXT DEFAULT NULL " +
+        ")";
+    // 同上，创建data表的语句，这里的DataColumns就是我们刚刚在Notes中定义的一个接口，里面定义了一系列静态的数据库表中的列名
+    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 ''" +
+        ")";
+    // 功能简介：
+    // 创建一个以note的ID为索引
+    // 解读：
+    // 用于在TABLE.DATA表上创建一个名为note_id_index的索引。
+    // 这个索引是基于DataColumns.NOTE_ID列的。IF NOT EXISTS确保了如果索引已经存在，那么就不会尝试重新创建它，避免了可能的错误。
+    // 索引通常用于提高查询性能，特别是在对某个字段进行频繁查询时。
+    private static final String CREATE_DATA_NOTE_ID_INDEX_SQL =
+        "CREATE INDEX IF NOT EXISTS note_id_index ON " +
+        TABLE.DATA + "(" + DataColumns.NOTE_ID + ");";
+
+    /* 以下是一些对便签增删改定义的触发器 */
+    /* 总结
+    * 这些触发器都是用来维护NOTE表和与之相关联的DATA表之间数据一致性的。
+    * 当在NOTE表中发生删除或更新操作时，这些触发器会自动执行相应的数据清理或更新操作，确保数据库中的数据保持正确和一致。
+    * 特别是在处理文件夹和回收站等逻辑时，这些触发器起到了非常重要的作用，可以自动管理数据的移动和删除。*/
+    /**
+     * Increase folder's note count when move note to the folder
+     */
+    // 功能简介：
+    // 添加触发器：增加文件夹的便签个数记录（因为我们会移动便签进入文件夹，这时候文件夹的计数要进行更新）
+    // 解读：
+    // 定义了一个SQL触发器increase_folder_count_on_update。
+    // 触发器是一种特殊的存储过程，它会在指定表上的指定事件（如INSERT、UPDATE、DELETE）发生时自动执行。
+    // 这个触发器会在TABLE.NOTE表的NoteColumns.PARENT_ID字段更新后执行。
+    // 触发器的逻辑是：当某个笔记的PARENT_ID（即父文件夹ID）被更新时，它会找到对应的文件夹（通过新的PARENT_ID），并将该文件夹的NOTES_COUNT（即笔记数）增加1。
+    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
+     */
+    // 功能简介：（触发器和上面的 “增加文件夹的便签个数记录” 同理，就不细节解读了）
+    // 添加触发器：减少文件夹的便签个数记录（因为我们会移动便签移出文件夹，这时候文件夹的计数要进行更新）
+    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
+     */
+    // 功能简介：（触发器原理和上面的 “增加文件夹的便签个数记录” 同理，就不细节解读了）
+    // 添加触发器：当我们在文件夹插入便签时，增加文件夹的便签个数记录
+    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
+     */
+    // 功能简介：（触发器原理和上面的 “增加文件夹的便签个数记录” 同理，就不细节解读了）
+    // 添加触发器：当我们在文件夹删除便签时，减少文件夹的便签个数记录
+    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}
+     */
+    // 功能简介：
+    // 添加触发器：当向DATA表中插入类型为NOTE（便签）的数据时，更新note表对应的笔记内容。
+    // 解读：
+    // 在DATA表上进行INSERT操作后，如果新插入的数据的MIME_TYPE为NOTE，则触发此操作。
+    // 它会更新NOTE表，将与新插入数据相关联的标签的SNIPPET（摘要）字段设置为新插入数据的CONTENT字段的值
+    private static final String DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER =
+        "CREATE TRIGGER update_note_content_on_insert " +
+        " AFTER INSERT ON " + TABLE.DATA +
+        " WHEN new." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" +
+        " BEGIN" +
+        "  UPDATE " + TABLE.NOTE +
+        "   SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT +
+        "  WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" +
+        " END";
+
+    /**
+     * Update note's content when data with {@link DataConstants#NOTE} type has changed
+     */
+    // 功能简介：
+    // 添加触发器：当DATA表中，类型为NOTE（便签）的数据更改时，更新note表对应的笔记内容。
+    // 解读：
+    // 在DATA表上进行UPDATE操作后，如果更新前的数据的MIME_TYPE为NOTE，则触发此操作。
+    // 它会更新NOTE表，将与更新后的数据相关联的笔记的SNIPPET字段设置为新数据的CONTENT字段的值
+    private static final String DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER =
+        "CREATE TRIGGER update_note_content_on_update " +
+        " AFTER UPDATE ON " + TABLE.DATA +
+        " WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" +
+        " BEGIN" +
+        "  UPDATE " + TABLE.NOTE +
+        "   SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT +
+        "  WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" +
+        " END";
+
+    /**
+     * Update note's content when data with {@link DataConstants#NOTE} type has deleted
+     */
+    // 功能简介：
+    // 添加触发器：当从NOTE表中删除笔记时，删除与该笔记相关联的数据（就是删除data表中为该note的数据）
+    // 解读：
+    // 在NOTE表上进行DELETE操作后，此触发器被激活。
+    // 它会从DATA表中删除所有与已删除的笔记（由old.ID表示）相关联的数据行（通过比较DATA表中的NOTE_ID字段与已删除笔记的ID来实现）
+    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
+     */
+    // 功能简介：
+    // 添加触发器：当从NOTE表中删除笔记时，删除与该笔记相关联的数据（就是删除data表中为该note的数据）
+    // 解读：
+    // 在NOTE表上进行DELETE操作后，此触发器被激活。
+    // 它会从DATA表中删除所有与已删除的笔记（由old.ID表示）相关联的数据行（通过比较DATA表中的NOTE_ID字段与已删除笔记的ID来实现）
+    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
+     */
+    // 功能简介：
+    // 添加触发器：当从NOTE表中删除一个文件夹时，删除该文件夹下的所有笔记。
+    // 解读：
+    // 在NOTE表上进行DELETE操作后，如果删除的是一个文件夹（由old.ID表示）
+    // 触发器会删除所有以该文件夹为父级（PARENT_ID）的笔记（通过比较NOTE表中的PARENT_ID字段与已删除文件夹的ID来实现）
+    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
+     */
+    // 功能简介：
+    // 添加触发器：当某个文件夹被移动到回收站时，移动该文件夹下的所有笔记到回收站
+    // 解读：
+    // 在NOTE表上进行UPDATE操作后，如果某个文件夹的新PARENT_ID字段值等于回收站的ID（Notes.ID_TRASH_FOLER）
+    // 触发器会更新所有以该文件夹为父级（PARENT_ID）的笔记，将它们也移动到回收站。
+    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";
+
+    // 构造器
+    public NotesDatabaseHelper(Context context) {
+        super(context, DB_NAME, null, DB_VERSION);
+    }
+
+    // 创建note（标签）表
+    public void createNoteTable(SQLiteDatabase db) {
+        db.execSQL(CREATE_NOTE_TABLE_SQL);
+        reCreateNoteTableTriggers(db);
+        createSystemFolder(db);
+        Log.d(TAG, "note table has been created");
+    }
+
+    // 重新创建或更新与笔记表相关的触发器。
+    // 首先，使用DROP TRIGGER IF EXISTS语句删除已存在的触发器。确保在重新创建触发器之前，不存在同名的触发器。
+    // 然后，使用db.execSQL()方法执行预定义的SQL语句，这些语句用于创建新的触发器。
+    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);
+    }
+
+    /* 以下部分是操作SQLite数据库部分 */
+    // 功能简介：
+    // 创建通话记录文件夹、默认文件夹、临时文件夹和回收站，并插入相关数据
+    // 具体解读：
+    // ContentValues是一个用于存储键值对的类，常用于SQLite数据库的插入操作
+    // values.put方法可以向ContentValues对象中添加数据。
+    // NoteColumns.ID是存储文件夹ID的列名，Notes.ID_CALL_RECORD_FOLDER是通话记录文件夹的ID。
+    // NoteColumns.TYPE是存储文件夹类型的列名，Notes.TYPE_SYSTEM表示这是一个系统文件夹。
+    // 使用db.insert方法将values中的数据插入到TABLE.NOTE（即标签表）中。
+    // 每次插入新数据前，都使用values.clear()方法清除ContentValues对象中的旧数据，确保不会重复插入旧数据。
+    // 然后分别创建默认文件夹、临时文件夹和回收站，并以同样的方法插入数据。
+    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){
+            upgradeToV5(db);
+            oldVersion++;
+        }
+
+        if (reCreateTriggers) {
+            reCreateNoteTableTriggers(db);
+            reCreateDataTableTriggers(db);
+        }
+
+        if (oldVersion != newVersion) {
+            throw new IllegalStateException("Upgrade notes database to version " + newVersion
+                    + "fails");
+        }
+    }
+
+    private void upgradeToV2(SQLiteDatabase db) {
+        db.execSQL("DROP TABLE IF EXISTS " + TABLE.NOTE);
+        db.execSQL("DROP TABLE IF EXISTS " + TABLE.DATA);
+        createNoteTable(db);
+        createDataTable(db);
+    }
+
+    private void upgradeToV3(SQLiteDatabase db) {
+        // drop unused triggers
+        db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_insert");
+        db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_delete");
+        db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_update");
+        // add a column for gtask id
+        db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.GTASK_ID
+                + " TEXT NOT NULL DEFAULT ''");
+        // add a trash system folder
+        ContentValues values = new ContentValues();
+        values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);
+        values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
+        db.insert(TABLE.NOTE, null, values);
+    }
+
+    private void upgradeToV4(SQLiteDatabase db) {
+        db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.VERSION
+                + " INTEGER NOT NULL DEFAULT 0");
+    }
+    private  void upgradeToV5(SQLiteDatabase db){
+        db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.PASSWORD
+                + " TEXT DEFAULT NULL  ");
+    }
+
+}

data/NotesProvider.java

@@ -0,0 +1,402 @@
+package net.micode.notes.data;
+ 
+ 
+import android.app.SearchManager;
+import android.content.ContentProvider;
+import android.content.ContentUris;
+import android.content.ContentValues;
+import android.content.Intent;
+import android.content.UriMatcher;
+import android.database.Cursor;
+import android.database.sqlite.SQLiteDatabase;
+import android.net.Uri;
+import android.text.TextUtils;
+import android.util.Log;
+ 
+import net.micode.notes.R;
+import net.micode.notes.data.Notes.DataColumns;
+import net.micode.notes.data.Notes.NoteColumns;
+import net.micode.notes.data.NotesDatabaseHelper.TABLE;
+ 
+ 
+public class NotesProvider extends ContentProvider {
+//    Android 应用程序中的一部分：内容提供者（ContentProvider）。
+//    内容提供者是 Android 四大组件之一，它允许应用程序之间共享数据。
+ 
+    //概述：
+    //NotesProvider的主要功能是作为一个内容提供者，为其他应用程序或组件提供对“Notes”数据的访问。
+    //它允许其他应用程序查询、插入、更新或删除标签数据。
+    //通过URI匹配，NotesProvider能够区分对哪种数据类型的请求（例如，单独的标签、标签的数据、文件夹操作等），并执行相应的操作。
+ 
+    //用于匹配不同URI的UriMatcher对象，通常用于解析传入的URI，并确定应该执行哪种操作。
+    private static final UriMatcher mMatcher;
+ 
+    //NotesDatabaseHelper实类，用来操作SQLite数据库，负责创建、更新和查询数据库。
+    private NotesDatabaseHelper mHelper;
+ 
+    //标签，输出日志时用来表示是该类发出的消息
+    private static final String TAG = "NotesProvider";
+ 
+    //6个URI的匹配码，用于区分不同的URI类型
+    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;
+ 
+    //进一步定义了URI匹配规则和搜索查询的投影
+    //功能概述：
+    //初始化了一个UriMatcher对象mMatcher，并添加了一系列的URI匹配规则。
+    //解读：
+    static {
+        //创建了一个UriMatcher实例，并设置默认匹配码为NO_MATCH，表示如果没有任何URI匹配，则返回这个码。
+        mMatcher = new UriMatcher(UriMatcher.NO_MATCH);
+        //添加规则，当URI的authority为Notes.AUTHORITY，路径为note时，返回匹配码URI_NOTE。
+        mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE);
+        //添加规则，当URI的authority为Notes.AUTHORITY，路径为note/后跟一个数字（#代表数字）时，返回匹配码URI_NOTE_ITEM。
+        mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM);
+        //和上面两句同理，但用于匹配数据相关的URI
+        mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA);
+        mMatcher.addURI(Notes.AUTHORITY, "data/#", URI_DATA_ITEM);
+        //用于匹配搜索相关的URI
+        mMatcher.addURI(Notes.AUTHORITY, "search", URI_SEARCH);
+        //这两行用于匹配搜索建议相关的URI
+        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.
+     */
+    //功能概述：
+    //一个 SQL 查询的投影部分，用于定义查询返回的结果集中应该包含哪些列。
+    //解读：（每行对应）
+    //返回笔记的 ID。
+    //笔记的 ID 也被重命名为 SUGGEST_COLUMN_INTENT_EXTRA_DATA，这通常用于 Android 的搜索建议中，作为传递给相关 Intent 的额外数据。
+    //对 SNIPPET 列的处理：首先使用 REPLACE 函数将 x'0A'（即换行符 \n）替换为空字符串，然后使用 TRIM 函数删除前后的空白字符，处理后的结果分别重命名为 SUGGEST_COLUMN_TEXT_1
+    //对 SNIPPET 列的处理：首先使用 REPLACE 函数将 x'0A'（即换行符 \n）替换为空字符串，然后使用 TRIM 函数删除前后的空白字符，处理后的结果分别重命名为 SUGGEST_COLUMN_TEXT_2
+    //返回一个用于搜索建议图标的资源 ID，并命名为 SUGGEST_COLUMN_ICON_1。
+    //返回一个固定的 Intent 动作 ACTION_VIEW，并命名为 SUGGEST_COLUMN_INTENT_ACTION。
+    //返回一个内容类型，并命名为 SUGGEST_COLUMN_INTENT_DATA。
+    private static final String NOTES_SEARCH_PROJECTION = NoteColumns.ID + "," //返回笔记的 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;
+ 
+    //功能概述：
+    //完整的 SQL 查询语句，用于从 TABLE.NOTE 表中检索信息
+    //解读：
+    // 使用上面定义的投影来选择数据。
+    // 并指定从哪个表中选择数据。
+    //WHERE子句包含三个条件：
+    // ①搜索 SNIPPET 列中包含特定模式的行（? 是一个占位符，实际查询时会用具体的值替换）。
+    // ②父ID不为回收站的ID：排除那些父 ID 为回收站的行。
+    // ③只选择类型为note（标签）的行。
+    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;
+ 
+    //重写onCreate方法：
+    //getContext() 方法被调用以获取当前组件的上下文（Context），以便 NotesDatabaseHelper 能够访问应用程序的资源和其他功能
+    //mHelper用于存储从 NotesDatabaseHelper.getInstance 方法返回的实例。这样，该实例就可以在整个组件的其他方法中被访问和使用。
+    @Override
+    public boolean onCreate() {
+        mHelper = NotesDatabaseHelper.getInstance(getContext());
+        return true;
+    }
+ 
+    //功能：查询数据
+    @Override
+    public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
+            String sortOrder) {
+        //初始化变量：
+        //Cursor对象 c，用来存储查询结果
+        //使用 NotesDatabaseHelper 的实例 mHelper来获取一个可读的数据库实例
+        //定义一个字符串id，用来存储从URI中解析出的ID
+        Cursor c = null;
+        SQLiteDatabase db = mHelper.getReadableDatabase();
+        String id = null;
+ 
+        //根据匹配不同的URI来进行不同的查询
+        switch (mMatcher.match(uri)) {
+            //  URI_NOTE：查询整个 NOTE 表。
+            //  URI_NOTE_ITEM：查询 NOTE 表中的特定项。ID 从 URI 的路径段中获取，并添加到查询条件中。
+            //  URI_DATA：查询整个 DATA 表。
+            //  URI_DATA_ITEM：查询 DATA 表中的特定项。ID 的获取和处理方式与 URI_NOTE_ITEM 相同。
+            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;
+ 
+            //URI_SEARCH 和 URI_SEARCH_SUGGEST：处理搜索查询。
+            //  代码首先检查是否提供了不应与搜索查询一起使用的参数（如 sortOrder, selection, selectionArgs, 或 projection）。
+            //  如果提供了这些参数，则抛出一个 IllegalArgumentException。
+            //  根据 URI 类型，从 URI 的路径段或查询参数中获取搜索字符串 searchString。
+            //  如果 searchString 为空或无效，则返回 null，表示没有搜索结果。
+            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;
+                }
+ 
+                //字符串格式化：格式化后的字符串就会是 "%s%"，即包含s是任何文本
+                //然后执行原始SQL查询
+                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;
+ 
+                //未知URI处理：
+            default:
+                throw new IllegalArgumentException("Unknown URI " + uri);
+        }
+        //如果查询结果不为空（即 Cursor 对象 c 不是 null），则为其设置一个通知 URI。
+        //这意味着当与这个 URI 关联的数据发生变化时，任何注册了监听这个 URI 的 ContentObserver 都会被通知。
+        if (c != null) {
+            c.setNotificationUri(getContext().getContentResolver(), uri);
+        }
+        return c;
+    }
+ 
+    //功能：插入数据
+    //参数：Uri 用来标识要插入数据的表，ContentValues对象包含要插入的键值对
+    @Override
+    public Uri insert(Uri uri, ContentValues values) {
+        //获取数据库
+        //三个长整型变量，分别用来存储数据项ID、便签ID 和插入行的ID
+        SQLiteDatabase db = mHelper.getWritableDatabase();
+        long dataId = 0, noteId = 0, insertedId = 0;
+ 
+        //对于 URI_NOTE，将values插入到 TABLE.NOTE 表中，并返回插入行的 ID。
+        //对于 URI_DATA，首先检查values是否包含 DataColumns.NOTE_ID，如果包含，则获取其值。如果不包含，记录一条日志信息。然后，将 values 插入到 TABLE.DATA 表中，并返回插入行的 ID。
+        //如果 uri 不是已知的 URI 类型，则抛出一个 IllegalArgumentException。
+        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);
+        }
+ 
+        //功能：通知变化
+        //如果noteId 或 dataId 大于 0（即成功插入了数据），则使用 ContentResolver 的 notifyChange 方法通知监听这些 URI 的观察者，告知数据已经改变。
+        //ContentUris.withAppendedId 方法用于在基本 URI 后面追加一个 ID，形成完整的 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);
+        }
+ 
+        //返回包含新插入数据项ID 的 Uri。允许调用者知道新插入的数据项的位置
+        return ContentUris.withAppendedId(uri, insertedId);
+    }
+ 
+    //功能：删除数据项
+    //参数：uri：标识要删除数据的表或数据项。  selection：一个可选的 WHERE 子句，用于指定删除条件。  selectionArgs：一个可选的字符串数组，用于替换 selection 中的占位符
+    @Override
+    public int delete(Uri uri, String selection, String[] selectionArgs) {
+        //count：记录被删除的行数。
+        //id：用于存储从 URI 中解析出的数据项 ID。
+        //db：可写的数据库对象，用于执行删除操作。
+        //deleteData：一个布尔值，用于标记是否删除了 DATA 表中的数据。
+        int count = 0;
+        String id = null;
+        SQLiteDatabase db = mHelper.getWritableDatabase();
+        boolean deleteData = false;
+ 
+        switch (mMatcher.match(uri)) {
+            //URI_NOTE:       修改 selection 语句：确保只删除 ID 大于 0 的笔记。然后执行删除操作并返回被删除的行数。
+            //URI_NOTE_ITEM:  从 URI 中解析出 ID。检查 ID 是否小于等于 0，如果是，则不执行删除操作；否则执行删除操作并返回被删除的行数
+            //URI_DATA：       执行删除操作并返回被删除的行数。设置 deleteData 为 true，表示删除了 DATA 表中的数据。
+            //URI_DATA_ITEM：  先从 URI 中解析出 ID，然后执行删除操作并返回被删除的行数，并设置 deleteData 为 true，表示删除了 DATA 表中的数据。
+            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);
+        }
+ 
+        //如果 count 大于 0，说明有数据被删除。
+        //如果 deleteData 为 true，则通知监听 Notes.CONTENT_NOTE_URI 的观察者，数据已改变。
+        //通知监听传入 uri 的观察者数据已改变。
+        if (count > 0) {
+            if (deleteData) {
+                getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
+            }
+            getContext().getContentResolver().notifyChange(uri, null);
+        }
+ 
+        return count;
+    }
+ 
+    //功能：更新数据库的数据
+    //参数：uri：标识要更新数据的表或数据项。  values：一个包含新值的键值对集合。
+    //     selection：一个可选的 WHERE 子句，用于指定更新条件。  selectionArgs：一个可选的字符串数组，用于替换 selection 中的占位符。
+    @Override
+    public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
+        //count：记录被更新的行数。
+        //id：用于存储从 URI 中解析出的数据项 ID。
+        //db：可写的 SQLite 数据库对象，用于执行更新操作。
+        //updateData：用于标记是否更新了 data 表中的数据。
+        int count = 0;
+        String id = null;
+        SQLiteDatabase db = mHelper.getWritableDatabase();
+        boolean updateData = false;
+ 
+        switch (mMatcher.match(uri)) {
+            //URI_NOTE：调用 increaseNoteVersion 方法（用于增加便签版本），然后在note表执行更新操作并返回被更新的行数。
+            //URI_NOTE_ITEM：从 URI 中解析出 ID，并调用 increaseNoteVersion 方法，传入解析出的 ID，最后在note表执行更新操作并返回被更新的行数。
+            //URI_DATA：在data表执行更新操作并返回被更新的行数。设置 updateData 为 true，表示更新了 DATA 表中的数据。
+            //URI_DATA_ITEM：从 URI 中解析出 ID。执行更新操作并返回被更新的行数。置 updateData 为 true，表示更新了 DATA 表中的数据。
+            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);
+        }
+ 
+        //如果 count 大于 0，说明有数据被更新。
+        //如果 updateData 为 true，则通知监听 Notes.CONTENT_NOTE_URI 的观察者数据已改变。
+        //通知监听传入 uri 的观察者数据已改变。
+        if (count > 0) {
+            if (updateData) {
+                getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
+            }
+            getContext().getContentResolver().notifyChange(uri, null);
+        }
+        return count;
+    }
+ 
+    //解析传入的条件语句：一个 SQL WHERE 子句的一部分
+    private String parseSelection(String selection) {
+        return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : "");
+    }
+ 
+    //更新note表的version列，将其值增加 1。
+    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;
+    }
+ 
+}

model/Note.java

@@ -0,0 +1,268 @@
+/*
+ * 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;
+ 
+ public class Note {
+     private ContentValues mNoteDiffValues; // 存储笔记的差异值
+     private NoteData mNoteData; // 存储笔记数据
+     private static final String TAG = "Note"; // 用于日志记录的标签
+ 
+     /**
+      * Create a new note id for adding a new note to databases
+      */
+     public static synchronized long getNewNoteId(Context context, long folderId) {
+         // 创建一个新的笔记并插入到数据库中
+         ContentValues values = new ContentValues(); // 创建内容值对象
+         long createdTime = System.currentTimeMillis(); // 获取当前时间
+         values.put(NoteColumns.CREATED_DATE, createdTime); // 设置创建日期
+         values.put(NoteColumns.MODIFIED_DATE, createdTime); // 设置修改日期
+         values.put(NoteColumns.TYPE, Notes.TYPE_NOTE); // 设置类型为笔记
+         values.put(NoteColumns.LOCAL_MODIFIED, 1); // 设置本地修改标志
+         values.put(NoteColumns.PARENT_ID, folderId); // 设置父ID为文件夹ID
+         Uri uri = context.getContentResolver().insert(Notes.CONTENT_NOTE_URI, values); // 插入笔记
+ 
+         long noteId = 0; // 初始化笔记ID
+         try {
+             noteId = Long.valueOf(uri.getPathSegments().get(1)); // 获取新插入笔记的ID
+         } catch (NumberFormatException e) {
+             Log.e(TAG, "Get note id error :" + e.toString()); // 记录错误
+             noteId = 0; // 设置ID为0
+         }
+         if (noteId == -1) {
+             throw new IllegalStateException("Wrong note id:" + noteId); // 抛出异常
+         }
+         return noteId; // 返回新笔记的ID
+     }
+ 
+     // 构造函数，初始化笔记
+     public Note() {
+         mNoteDiffValues = new ContentValues(); // 初始化差异值对象
+         mNoteData = new NoteData(); // 初始化笔记数据对象
+     }
+ 
+     // 设置笔记的值
+     public void setNoteValue(String key, String value) {
+         mNoteDiffValues.put(key, value); // 设置差异值
+         mNoteDiffValues.put(NoteColumns.LOCAL_MODIFIED, 1); // 标记为本地修改
+         mNoteDiffValues.put(NoteColumns.MODIFIED_DATE, System.currentTimeMillis()); // 更新修改日期
+     }
+ 
+     // 设置文本数据
+     public void setTextData(String key, String value) {
+         mNoteData.setTextData(key, value); // 设置文本数据
+     }
+ 
+     // 设置文本数据ID
+     public void setTextDataId(long id) {
+         mNoteData.setTextDataId(id); // 设置文本数据ID
+     }
+ 
+     // 获取文本数据ID
+     public long getTextDataId() {
+         return mNoteData.mTextDataId; // 返回文本数据ID
+     }
+ 
+     // 设置通话数据ID
+     public void setCallDataId(long id) {
+         mNoteData.setCallDataId(id); // 设置通话数据ID
+     }
+ 
+     // 设置通话数据
+     public void setCallData(String key, String value) {
+         mNoteData.setCallData(key, value); // 设置通话数据
+     }
+ 
+     // 检查笔记是否被本地修改
+     public boolean isLocalModified() {
+         return mNoteDiffValues.size() > 0 || mNoteData.isLocalModified(); // 如果有差异值或笔记数据被修改，返回true
+     }
+ 
+     // 同步笔记到数据库
+     public boolean syncNote(Context context, long noteId) {
+         if (noteId <= 0) {
+             throw new IllegalArgumentException("Wrong note id:" + noteId); // 验证笔记ID
+         }
+ 
+         if (!isLocalModified()) {
+             return true; // 如果没有本地修改，返回true
+         }
+ 
+         /**
+          * 理论上，一旦数据发生变化，笔记应该在 {@link NoteColumns#LOCAL_MODIFIED} 和
+          * {@link NoteColumns#MODIFIED_DATE} 上更新。为了数据安全，尽管更新笔记失败，我们也更新
+          * 笔记数据的信息
+          */
+         if (context.getContentResolver().update(
+                 ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), mNoteDiffValues, null,
+                 null) == 0) {
+             Log.e(TAG, "Update note error, should not happen"); // 记录错误
+             // 不返回，继续执行
+         }
+         mNoteDiffValues.clear(); // 清空差异值
+ 
+         if (mNoteData.isLocalModified()
+                 && (mNoteData.pushIntoContentResolver(context, noteId) == null)) {
+             return false; // 如果笔记数据有本地修改且推送失败，返回false
+         }
+ 
+         return true; // 返回成功
+     }
+ 
+     // 内部类，用于存储笔记数据
+     private class NoteData {
+         private long mTextDataId; // 文本数据ID
+         private ContentValues mTextDataValues; // 存储文本数据的内容值
+         private long mCallDataId; // 通话数据ID
+         private ContentValues mCallDataValues; // 存储通话数据的内容值
+         private static final String TAG = "NoteData"; // 用于日志记录的标签
+ 
+         // 构造函数，初始化笔记数据
+         public NoteData() {
+             mTextDataValues = new ContentValues(); // 初始化文本数据内容值
+             mCallDataValues = new ContentValues(); // 初始化通话数据内容值
+             mTextDataId = 0; // 初始化文本数据ID
+             mCallDataId = 0; // 初始化通话数据ID
+         }
+ 
+         // 检查笔记数据是否被本地修改
+         boolean isLocalModified() {
+             return mTextDataValues.size() > 0 || mCallDataValues.size() > 0; // 如果文本数据或通话数据有内容，返回true
+         }
+ 
+         // 设置文本数据ID
+         void setTextDataId(long id) {
+             if(id <= 0) {
+                 throw new IllegalArgumentException("Text data id should larger than 0"); // 验证文本数据ID
+             }
+             mTextDataId = id; // 设置文本数据ID
+         }
+ 
+         // 设置通话数据ID
+         void setCallDataId(long id) {
+             if (id <= 0) {
+                 throw new IllegalArgumentException("Call data id should larger than 0"); // 验证通话数据ID
+             }
+             mCallDataId = id; // 设置通话数据ID
+         }
+ 
+         // 设置通话数据
+         void setCallData(String key, String value) {
+             mCallDataValues.put(key, value); // 设置通话数据内容
+             mNoteDiffValues.put(NoteColumns.LOCAL_MODIFIED, 1); // 标记为本地修改
+             mNoteDiffValues.put(NoteColumns.MODIFIED_DATE, System.currentTimeMillis()); // 更新修改日期
+         }
+ 
+         // 设置文本数据
+         void setTextData(String key, String value) {
+             mTextDataValues.put(key, value); // 设置文本数据内容
+             mNoteDiffValues.put(NoteColumns.LOCAL_MODIFIED, 1); // 标记为本地修改
+             mNoteDiffValues.put(NoteColumns.MODIFIED_DATE, System.currentTimeMillis()); // 更新修改日期
+         }
+ 
+         // 推送数据到内容解析器
+         Uri pushIntoContentResolver(Context context, long noteId) {
+             /**
+              * 安全检查
+              */
+             if (noteId <= 0) {
+                 throw new IllegalArgumentException("Wrong note id:" + noteId); // 验证笔记ID
+             }
+ 
+             ArrayList<ContentProviderOperation> operationList = new ArrayList<ContentProviderOperation>(); // 操作列表
+             ContentProviderOperation.Builder builder = null; // 操作构建器
+ 
+             if(mTextDataValues.size() > 0) { // 如果有文本数据
+                 mTextDataValues.put(DataColumns.NOTE_ID, noteId); // 设置笔记ID
+                 if (mTextDataId == 0) { // 如果文本数据ID为0，表示是新数据
+                     mTextDataValues.put(DataColumns.MIME_TYPE, TextNote.CONTENT_ITEM_TYPE); // 设置MIME类型
+                     Uri uri = context.getContentResolver().insert(Notes.CONTENT_DATA_URI,
+                             mTextDataValues); // 插入文本数据
+                     try {
+                         setTextDataId(Long.valueOf(uri.getPathSegments().get(1))); // 获取新插入文本数据的ID
+                     } catch (NumberFormatException e) {
+                         Log.e(TAG, "Insert new text data fail with noteId" + noteId); // 记录错误
+                         mTextDataValues.clear(); // 清空文本数据内容值
+                         return null; // 返回null
+                     }
+                 } else { // 如果文本数据ID不为0，表示是更新操作
+                     builder = ContentProviderOperation.newUpdate(ContentUris.withAppendedId(
+                             Notes.CONTENT_DATA_URI, mTextDataId)); // 创建更新操作
+                     builder.withValues(mTextDataValues); // 设置更新内容
+                     operationList.add(builder.build()); // 添加到操作列表
+                 }
+                 mTextDataValues.clear(); // 清空文本数据内容值
+             }
+ 
+             if(mCallDataValues.size() > 0) { // 如果有通话数据
+                 mCallDataValues.put(DataColumns.NOTE_ID, noteId); // 设置笔记ID
+                 if (mCallDataId == 0) { // 如果通话数据ID为0，表示是新数据
+                     mCallDataValues.put(DataColumns.MIME_TYPE, CallNote.CONTENT_ITEM_TYPE); // 设置MIME类型
+                     Uri uri = context.getContentResolver().insert(Notes.CONTENT_DATA_URI,
+                             mCallDataValues); // 插入通话数据
+                     try {
+                         setCallDataId(Long.valueOf(uri.getPathSegments().get(1))); // 获取新插入通话数据的ID
+                     } catch (NumberFormatException e) {
+                         Log.e(TAG, "Insert new call data fail with noteId" + noteId); // 记录错误
+                         mCallDataValues.clear(); // 清空通话数据内容值
+                         return null; // 返回null
+                     }
+                 } else { // 如果通话数据ID不为0，表示是更新操作
+                     builder = ContentProviderOperation.newUpdate(ContentUris.withAppendedId(
+                             Notes.CONTENT_DATA_URI, mCallDataId)); // 创建更新操作
+                     builder.withValues(mCallDataValues); // 设置更新内容
+                     operationList.add(builder.build()); // 添加到操作列表
+                 }
+                 mCallDataValues.clear(); // 清空通话数据内容值
+             }
+ 
+             if (operationList.size() > 0) { // 如果操作列表不为空
+                 try {
+                     ContentProviderResult[] results = context.getContentResolver().applyBatch(
+                             Notes.AUTHORITY, operationList); // 批量应用操作
+                     return (results == null || results.length == 0 || results[0] == null) ? null
+                             : ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId); // 返回笔记URI
+                 } catch (RemoteException e) {
+                     Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage())); // 记录错误
+                     return null; // 返回null
+                 } catch (OperationApplicationException e) {
+                     Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage())); // 记录错误
+                     return null; // 返回null
+                 }
+             }
+             return null; // 返回null
+         }
+     }
+ }
+ 

model/WorkingNote.java

@@ -0,0 +1,395 @@
+/*
+ * 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;
+ 
+ import java.util.ArrayList;
+ 
+ public class WorkingNote {
+     // 笔记对象
+     private Note mNote;
+     // 笔记ID
+     private long mNoteId;
+     // 笔记内容
+     private String mContent;
+     // 笔记模式
+     private int mMode;
+ 
+     private long mAlertDate; // 提醒日期
+ 
+     private long mModifiedDate; // 修改日期
+ 
+     private int mBgColorId; // 背景颜色ID
+ 
+     private int mWidgetId; // 小部件ID
+ 
+     private int mWidgetType; // 小部件类型
+ 
+     private long mFolderId; // 文件夹ID
+ 
+     private Context mContext; // 上下文对象
+ 
+     private static final String TAG = "WorkingNote"; // 用于日志记录的标签
+ 
+     private boolean mIsDeleted; // 标记笔记是否被删除
+ 
+     private NoteSettingChangedListener mNoteSettingStatusListener; // 笔记设置改变监听器
+ 
+     // 数据投影，用于查询笔记数据
+     public static final String[] DATA_PROJECTION = new String[] {
+             DataColumns.ID,
+             DataColumns.CONTENT,
+             DataColumns.MIME_TYPE,
+             DataColumns.DATA1,
+             DataColumns.DATA2,
+             DataColumns.DATA3,
+             DataColumns.DATA4,
+     };
+ 
+     // 笔记投影，用于查询笔记信息
+     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
+     };
+ 
+     // 数据列索引
+     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;
+ 
+     // 笔记列索引
+     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;
+ 
+     // 新建笔记构造函数
+     private WorkingNote(Context context, long folderId) {
+         mContext = context; // 保存上下文
+         mAlertDate = 0; // 初始化提醒日期为0
+         mModifiedDate = System.currentTimeMillis(); // 获取当前时间作为修改日期
+         mFolderId = folderId; // 设置文件夹ID
+         mNote = new Note(); // 创建新的笔记对象
+         mNoteId = 0; // 初始化笔记ID为0
+         mIsDeleted = false; // 初始化删除标志为false
+         mMode = 0; // 初始化模式为0
+         mWidgetType = Notes.TYPE_WIDGET_INVALIDE; // 初始化小部件类型为无效
+     }
+ 
+     // 已存在笔记构造函数
+     private WorkingNote(Context context, long noteId, long folderId) {
+         mContext = context; // 保存上下文
+         mNoteId = noteId; // 设置笔记ID
+         mFolderId = folderId; // 设置文件夹ID
+         mIsDeleted = false; // 初始化删除标志为false
+         mNote = new Note(); // 创建新的笔记对象
+         loadNote(); // 加载笔记信息
+     }
+ 
+     // 加载笔记信息
+     private void loadNote() {
+         Cursor cursor = mContext.getContentResolver().query(
+                 ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, mNoteId), NOTE_PROJECTION, null,
+                 null, null); // 查询笔记信息
+ 
+         if (cursor != null) {
+             if (cursor.moveToFirst()) { // 如果有结果
+                 mFolderId = cursor.getLong(NOTE_PARENT_ID_COLUMN); // 获取父ID
+                 mBgColorId = cursor.getInt(NOTE_BG_COLOR_ID_COLUMN); // 获取背景颜色ID
+                 mWidgetId = cursor.getInt(NOTE_WIDGET_ID_COLUMN); // 获取小部件ID
+                 mWidgetType = cursor.getInt(NOTE_WIDGET_TYPE_COLUMN); // 获取小部件类型
+                 mAlertDate = cursor.getLong(NOTE_ALERTED_DATE_COLUMN); // 获取提醒日期
+                 mModifiedDate = cursor.getLong(NOTE_MODIFIED_DATE_COLUMN); // 获取修改日期
+             }
+             cursor.close(); // 关闭Cursor
+         } else {
+             Log.e(TAG, "No note with id:" + mNoteId); // 记录错误
+             throw new IllegalArgumentException("Unable to find note with id " + mNoteId); // 抛出异常
+         }
+         loadNoteData(); // 加载笔记数据
+     }
+ 
+     // 加载笔记数据
+     private void loadNoteData() {
+         Cursor cursor = mContext.getContentResolver().query(Notes.CONTENT_DATA_URI, DATA_PROJECTION,
+                 DataColumns.NOTE_ID + "=?", new String[] {
+                     String.valueOf(mNoteId)
+                 }, null); // 查询笔记数据
+ 
+         if (cursor != null) {
+             if (cursor.moveToFirst()) { // 如果有结果
+                 do {
+                     String type = cursor.getString(DATA_MIME_TYPE_COLUMN); // 获取数据类型
+                     if (DataConstants.NOTE.equals(type)) { // 如果是文本笔记
+                         mContent = cursor.getString(DATA_CONTENT_COLUMN); // 获取内容
+                         mMode = cursor.getInt(DATA_MODE_COLUMN); // 获取模式
+                         mNote.setTextDataId(cursor.getLong(DATA_ID_COLUMN)); // 设置文本数据ID
+                     } else if (DataConstants.CALL_NOTE.equals(type)) { // 如果是通话笔记
+                         mNote.setCallDataId(cursor.getLong(DATA_ID_COLUMN)); // 设置通话数据ID
+                     } else {
+                         Log.d(TAG, "Wrong note type with type:" + type); // 记录错误
+                     }
+                 } while (cursor.moveToNext()); // 遍历所有结果
+             }
+             cursor.close(); // 关闭Cursor
+         } else {
+             Log.e(TAG, "No data with id:" + mNoteId); // 记录错误
+             throw new IllegalArgumentException("Unable to find note's data with id " + mNoteId); // 抛出异常
+         }
+     }
+ 
+     // 创建一个空的笔记
+     public static WorkingNote createEmptyNote(Context context, long folderId, int widgetId,
+             int widgetType, int defaultBgColorId) {
+         WorkingNote note = new WorkingNote(context, folderId); // 创建新的工作笔记
+         note.setBgColorId(defaultBgColorId); // 设置默认背景颜色ID
+         note.setWidgetId(widgetId); // 设置小部件ID
+         note.setWidgetType(widgetType); // 设置小部件类型
+         return note; // 返回新创建的笔记
+     }
+ 
+     // 根据ID加载笔记
+     public static WorkingNote load(Context context, long id) {
+         return new WorkingNote(context, id, 0); // 创建工作笔记并加载
+     }
+ 
+     // 保存笔记
+     public synchronized boolean saveNote() {
+         if (isWorthSaving()) { // 如果值得保存
+             if (!existInDatabase()) { // 如果笔记不存在于数据库中
+                 if ((mNoteId = Note.getNewNoteId(mContext, mFolderId)) == 0) { // 创建新笔记ID
+                     Log.e(TAG, "Create new note fail with id:" + mNoteId); // 记录错误
+                     return false; // 返回失败
+                 }
+             }
+ 
+             mNote.syncNote(mContext, mNoteId); // 同步笔记到数据库
+ 
+             /**
+              * 如果存在与此笔记相关的小部件，则更新小部件内容
+              */
+             if (mWidgetId != AppWidgetManager.INVALID_APPWIDGET_ID
+                     && mWidgetType != Notes.TYPE_WIDGET_INVALIDE
+                     && mNoteSettingStatusListener != null) {
+                 mNoteSettingStatusListener.onWidgetChanged(); // 通知小部件已更改
+             }
+             return true; // 返回成功
+         } else {
+             return false; // 返回失败
+         }
+     }
+ 
+     // 检查笔记是否存在于数据库中
+     public boolean existInDatabase() {
+         return mNoteId > 0; // 如果笔记ID大于0，则存在
+     }
+ 
+     // 检查笔记是否值得保存
+     private boolean isWorthSaving() {
+         if (mIsDeleted || (!existInDatabase() && TextUtils.isEmpty(mContent))
+                 || (existInDatabase() && !mNote.isLocalModified())) {
+             return false; // 如果被删除或内容为空，返回false
+         } else {
+             return true; // 返回true
+         }
+     }
+ 
+     // 设置笔记设置改变监听器
+     public void setOnSettingStatusChangedListener(NoteSettingChangedListener l) {
+         mNoteSettingStatusListener = l; // 设置监听器
+     }
+ 
+     // 设置提醒日期
+     public void setAlertDate(long date, boolean set) {
+         if (date != mAlertDate) {
+             mAlertDate = date; // 更新提醒日期
+             mNote.setNoteValue(NoteColumns.ALERTED_DATE, String.valueOf(mAlertDate)); // 设置笔记的提醒日期
+         }
+         if (mNoteSettingStatusListener != null) {
+             mNoteSettingStatusListener.onClockAlertChanged(date, set); // 通知提醒状态已更改
+         }
+     }
+ 
+     // 标记笔记为删除
+     public void markDeleted(boolean mark) {
+         mIsDeleted = mark; // 更新删除标志
+         if (mWidgetId != AppWidgetManager.INVALID_APPWIDGET_ID
+                 && mWidgetType != Notes.TYPE_WIDGET_INVALIDE && mNoteSettingStatusListener != null) {
+                 mNoteSettingStatusListener.onWidgetChanged(); // 通知小部件已更改
+         }
+     }
+ 
+     // 设置背景颜色ID
+     public void setBgColorId(int id) {
+         if (id != mBgColorId) {
+             mBgColorId = id; // 更新背景颜色ID
+             if (mNoteSettingStatusListener != null) {
+                 mNoteSettingStatusListener.onBackgroundColorChanged(); // 通知背景颜色已更改
+             }
+             mNote.setNoteValue(NoteColumns.BG_COLOR_ID, String.valueOf(id)); // 设置笔记的背景颜色ID
+         }
+     }
+ 
+     // 设置检查列表模式
+     public void setCheckListMode(int mode) {
+         if (mMode != mode) {
+             if (mNoteSettingStatusListener != null) {
+                 mNoteSettingStatusListener.onCheckListModeChanged(mMode, mode); // 通知模式已更改
+             }
+             mMode = mode; // 更新模式
+             mNote.setTextData(TextNote.MODE, String.valueOf(mMode)); // 设置笔记的模式
+         }
+     }
+ 
+     // 设置小部件类型
+     public void setWidgetType(int type) {
+         if (type != mWidgetType) {
+             mWidgetType = type; // 更新小部件类型
+             mNote.setNoteValue(NoteColumns.WIDGET_TYPE, String.valueOf(mWidgetType)); // 设置笔记的小部件类型
+         }
+     }
+ 
+     // 设置小部件ID
+     public void setWidgetId(int id) {
+         if (id != mWidgetId) {
+             mWidgetId = id; // 更新小部件ID
+             mNote.setNoteValue(NoteColumns.WIDGET_ID, String.valueOf(mWidgetId)); // 设置笔记的小部件ID
+         }
+     }
+ 
+     // 设置工作文本
+     public void setWorkingText(String text) {
+         if (!TextUtils.equals(mContent, text)) {
+             mContent = text; // 更新内容
+             mNote.setTextData(DataColumns.CONTENT, mContent); // 设置笔记的内容
+         }
+     }
+ 
+     // 将笔记转换为通话笔记
+     public void convertToCallNote(String phoneNumber, long callDate) {
+         mNote.setCallData(CallNote.CALL_DATE, String.valueOf(callDate)); // 设置通话日期
+         mNote.setCallData(CallNote.PHONE_NUMBER, phoneNumber); // 设置电话号码
+         mNote.setNoteValue(NoteColumns.PARENT_ID, String.valueOf(Notes.ID_CALL_RECORD_FOLDER)); // 设置父ID为通话记录文件夹ID
+     }
+ 
+     // 检查是否有提醒
+     public boolean hasClockAlert() {
+         return (mAlertDate > 0); // 如果提醒日期大于0，返回true
+     }
+ 
+     // 获取笔记内容
+     public String getContent() {
+         return mContent; // 返回笔记内容
+     }
+ 
+     // 获取提醒日期
+     public long getAlertDate() {
+         return mAlertDate; // 返回提醒日期
+     }
+ 
+     // 获取修改日期
+     public long getModifiedDate() {
+         return mModifiedDate; // 返回修改日期
+     }
+ 
+     // 获取背景颜色资源ID
+     public int getBgColorResId() {
+         return NoteBgResources.getNoteBgResource(mBgColorId); // 返回背景颜色资源ID
+     }
+ 
+     // 获取背景颜色ID
+     public int getBgColorId() {
+         return mBgColorId; // 返回背景颜色ID
+     }
+ 
+     // 获取标题背景资源ID
+     public int getTitleBgResId() {
+         return NoteBgResources.getNoteTitleBgResource(mBgColorId); // 返回标题背景资源ID
+     }
+ 
+     // 获取检查列表模式
+     public int getCheckListMode() {
+         return mMode; // 返回模式
+     }
+ 
+     // 获取笔记ID
+     public long getNoteId() {
+         return mNoteId; // 返回笔记ID
+     }
+ 
+     // 获取文件夹ID
+     public long getFolderId() {
+         return mFolderId; // 返回文件夹ID
+     }
+ 
+     // 获取小部件ID
+     public int getWidgetId() {
+         return mWidgetId; // 返回小部件ID
+     }
+ 
+     // 获取小部件类型
+     public int getWidgetType() {
+         return mWidgetType; // 返回小部件类型
+     }
+ 
+     // 笔记设置改变监听器接口
+     public interface NoteSettingChangedListener {
+         /**
+          * 当当前笔记的背景颜色刚刚改变时调用
+          */
+         void onBackgroundColorChanged();
+ 
+         /**
+          * 当用户设置时钟时调用
+          */
+         void onClockAlertChanged(long date, boolean set);
+ 
+         /**
+          * 当用户从小部件创建笔记时调用
+          */
+         void onWidgetChanged();
+ 
+         /**
+          * 当在检查列表模式和普通模式之间切换时调用
+          * @param oldMode 是切换前的模式
+          * @param newMode 是切换后的新模式
+          */
+         void onCheckListModeChanged(int oldMode, int newMode);
+     }
+ }
+ 

tool/BackupUtils.java

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

tool/DataUtils.java

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

tool/GTaskStringUtils.java

@@ -0,0 +1,112 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.tool;
+
+public class GTaskStringUtils {
+
+    public final static String GTASK_JSON_ACTION_ID = "action_id";
+
+    public final static String GTASK_JSON_ACTION_LIST = "action_list";
+
+    public final static String GTASK_JSON_ACTION_TYPE = "action_type";
+
+    public final static String GTASK_JSON_ACTION_TYPE_CREATE = "create";
+
+    public final static String GTASK_JSON_ACTION_TYPE_GETALL = "get_all";
+
+    public final static String GTASK_JSON_ACTION_TYPE_MOVE = "move";
+
+    public final static String GTASK_JSON_ACTION_TYPE_UPDATE = "update";
+
+    public final static String GTASK_JSON_CREATOR_ID = "creator_id";
+
+    public final static String GTASK_JSON_CHILD_ENTITY = "child_entity";
+
+    public final static String GTASK_JSON_CLIENT_VERSION = "client_version";
+
+    public final static String GTASK_JSON_COMPLETED = "completed";
+
+    public final static String GTASK_JSON_CURRENT_LIST_ID = "current_list_id";
+
+    public final static String GTASK_JSON_DEFAULT_LIST_ID = "default_list_id";
+
+    public final static String GTASK_JSON_DELETED = "deleted";
+
+    public final static String GTASK_JSON_DEST_LIST = "dest_list";
+
+    public final static String GTASK_JSON_DEST_PARENT = "dest_parent";
+
+    public final static String GTASK_JSON_DEST_PARENT_TYPE = "dest_parent_type";
+
+    public final static String GTASK_JSON_ENTITY_DELTA = "entity_delta";
+
+    public final static String GTASK_JSON_ENTITY_TYPE = "entity_type";
+
+    public final static String GTASK_JSON_GET_DELETED = "get_deleted";
+
+    public final static String GTASK_JSON_ID = "id";
+
+    public final static String GTASK_JSON_INDEX = "index";
+
+    public final static String GTASK_JSON_LAST_MODIFIED = "last_modified";
+
+    public final static String GTASK_JSON_LATEST_SYNC_POINT = "latest_sync_point";
+
+    public final static String GTASK_JSON_LIST_ID = "list_id";
+
+    public final static String GTASK_JSON_LISTS = "lists";
+
+    public final static String GTASK_JSON_NAME = "name";
+
+    public final static String GTASK_JSON_NEW_ID = "new_id";
+
+    public final static String GTASK_JSON_NOTES = "notes";
+
+    public final static String GTASK_JSON_PARENT_ID = "parent_id";
+
+    public final static String GTASK_JSON_PRIOR_SIBLING_ID = "prior_sibling_id";
+
+    public final static String GTASK_JSON_RESULTS = "results";
+
+    public final static String GTASK_JSON_SOURCE_LIST = "source_list";
+
+    public final static String GTASK_JSON_TASKS = "tasks";
+
+    public final static String GTASK_JSON_TYPE = "type";
+
+    public final static String GTASK_JSON_TYPE_GROUP = "GROUP";
+
+    public final static String GTASK_JSON_TYPE_TASK = "TASK";
+
+    public final static String GTASK_JSON_USER = "user";
+
+    public final static String MIUI_FOLDER_PREFFIX = "[MIUI_Notes]";
+
+    public final static String FOLDER_DEFAULT = "Default";
+
+    public final static String FOLDER_CALL_NOTE = "Call_Note";
+
+    public final static String FOLDER_META = "METADATA";
+
+    public final static String META_HEAD_GTASK_ID = "meta_gid";
+
+    public final static String META_HEAD_NOTE = "meta_note";
+
+    public final static String META_HEAD_DATA = "meta_data";
+
+    public final static String META_NOTE_NAME = "[META INFO] DON'T UPDATE AND DELETE";
+}

tool/ResourceParser.java

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

ui/AlarmAlertActivity.java

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

ui/AlarmInitReceiver.java

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

ui/AlarmReceiver.java

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

ui/DateTimePicker.java

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

ui/DateTimePickerDialog.java

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

ui/DropdownMenu.java

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

ui/FoldersListAdapter.java

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

ui/NoteEditActivity.java

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

ui/NoteEditText.java

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

ui/NoteItemData.java

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

ui/NotesListAdapter.java

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

ui/NotesListItem.java

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

ui/NotesPreferenceActivity.java

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

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();
+}

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;
+    }
+}

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;
+    }
+}