MetaData.java

@@ -1,90 +0,0 @@
-/*
- * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *        http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package net.micode.notes.gtask.data;
-
-import android.database.Cursor;
-import android.util.Log;
-
-import net.micode.notes.tool.GTaskStringUtils;
-
-import org.json.JSONException;
-import org.json.JSONObject;
-
-// MetaData类继承自Task类，负责处理任务的元数据
-public class MetaData extends Task {
-    private final static String TAG = MetaData.class.getSimpleName(); // 用于日志记录的TAG
-
-    private String mRelatedGid = null; // 存储相关任务的ID
-
-    // 设置元数据，包括任务ID和相关的元信息
-    public void setMeta(String gid, JSONObject metaInfo) {
-        try {
-            // 将任务ID放入元信息JSON对象中
-            metaInfo.put(GTaskStringUtils.META_HEAD_GTASK_ID, gid);
-        } catch (JSONException e) {
-            Log.e(TAG, "failed to put related gid"); // 记录错误
-        }
-        setNotes(metaInfo.toString()); // 设置笔记内容为元信息的字符串表示
-        setName(GTaskStringUtils.META_NOTE_NAME); // 设置名称
-    }
-
-    // 获取相关任务的ID
-    public String getRelatedGid() {
-        return mRelatedGid;
-    }
-
-    // 检查当前对象是否值得保存
-    @Override
-    public boolean isWorthSaving() {
-        return getNotes() != null; // 如果笔记内容不为空，则值得保存
-    }
-
-    // 从远程JSON对象设置内容
-    @Override
-    public void setContentByRemoteJSON(JSONObject js) {
-        super.setContentByRemoteJSON(js); // 调用父类方法
-        if (getNotes() != null) {
-            try {
-                // 将笔记内容转换为JSON对象
-                JSONObject metaInfo = new JSONObject(getNotes().trim());
-                // 获取相关任务的ID
-                mRelatedGid = metaInfo.getString(GTaskStringUtils.META_HEAD_GTASK_ID);
-            } catch (JSONException e) {
-                Log.w(TAG, "failed to get related gid"); // 记录警告
-                mRelatedGid = null; // 设置为null以表示失败
-            }
-        }
-    }
-
-    // 此方法不应被调用，抛出异常
-    @Override
-    public void setContentByLocalJSON(JSONObject js) {
-        throw new IllegalAccessError("MetaData:setContentByLocalJSON should not be called");
-    }
-
-    // 此方法不应被调用，抛出异常
-    @Override
-    public JSONObject getLocalJSONFromContent() {
-        throw new IllegalAccessError("MetaData:getLocalJSONFromContent should not be called");
-    }
-
-    // 此方法不应被调用，抛出异常
-    @Override
-    public int getSyncAction(Cursor c) {
-        throw new IllegalAccessError("MetaData:getSyncAction should not be called");
-    }
-}

README.md

@@ -0,0 +1,2 @@
+# note
+

src/ActionFailureException.java

@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.gtask.exception;
+
+/**
+ * ActionFailureException 类是用于表示操作失败时抛出的异常。
+ * 它继承自 RuntimeException，因此它是一个非检查型异常（unchecked exception），
+ * 这意味着在方法签名中不需要声明此异常可能会被抛出。
+ */
+public class ActionFailureException extends RuntimeException {
+
+    // 序列化版本唯一标识符，用于确保类的不同版本之间的兼容性。
+    private static final long serialVersionUID = 4425249765923293627L;
+
+    /**
+     * 构造一个没有详细信息消息和原因的 ActionFailureException。
+     */
+    public ActionFailureException() {
+        super();
+    }
+
+    /**
+     * 使用指定的详细信息消息构造一个新的 ActionFailureException。
+     * @param paramString 提供更多关于异常的信息的消息字符串。
+     */
+    public ActionFailureException(String paramString) {
+        super(paramString);
+    }
+
+    /**
+     * 使用指定的详细信息消息和原因构造一个新的 ActionFailureException。
+     * @param paramString 提供更多关于异常的信息的消息字符串。
+     * @param paramThrowable 导致当前异常的底层原因。
+     */
+    public ActionFailureException(String paramString, Throwable paramThrowable) {
+        super(paramString, paramThrowable);
+    }
+}

src/AlarmAlertActivity.java

@@ -0,0 +1,163 @@
+/*
+ * 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;           // 存储笔记的 ID
+    private String mSnippet;        // 存储笔记的简短内容（摘要）
+    private static final int SNIPPET_PREW_MAX_LEN = 60; // 摘要最大长度
+    MediaPlayer mPlayer;           // 用于播放闹铃音的媒体播放器
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        requestWindowFeature(Window.FEATURE_NO_TITLE); // 请求无标题窗口
+
+        final Window win = getWindow();
+        win.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED); // 当屏幕锁定时仍然显示窗口
+
+        // 如果屏幕关闭，保持屏幕亮起
+        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();  // 获取传递进来的 Intent
+
+        try {
+            mNoteId = Long.valueOf(intent.getData().getPathSegments().get(1)); // 获取笔记的 ID
+            // 获取笔记的简短摘要，如果摘要太长，截取并附加说明
+            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; // 如果获取笔记信息失败，则返回
+        }
+
+        mPlayer = new MediaPlayer();  // 初始化媒体播放器
+        // 如果笔记在数据库中是可见的，显示对话框并播放闹铃音
+        if (DataUtils.visibleInNoteDatabase(getContentResolver(), mNoteId, Notes.TYPE_NOTE)) {
+            showActionDialog();
+            playAlarmSound();
+        } else {
+            finish();  // 如果笔记不可见，则结束此活动
+        }
+    }
+
+    // 检查屏幕是否开启
+    private boolean isScreenOn() {
+        PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
+        return pm.isScreenOn();
+    }
+
+    // 播放闹铃音
+    private void playAlarmSound() {
+        // 获取系统的默认闹铃音 URI
+        Uri url = RingtoneManager.getActualDefaultRingtoneUri(this, RingtoneManager.TYPE_ALARM);
+
+        // 获取当前铃声模式，检查闹铃是否会被静音
+        int silentModeStreams = Settings.System.getInt(getContentResolver(),
+                Settings.System.MODE_RINGER_STREAMS_AFFECTED, 0);
+
+        // 根据静音模式设置音频流类型
+        if ((silentModeStreams & (1 << AudioManager.STREAM_ALARM)) != 0) {
+            mPlayer.setAudioStreamType(silentModeStreams);
+        } else {
+            mPlayer.setAudioStreamType(AudioManager.STREAM_ALARM); // 设置音频流类型为闹铃
+        }
+        try {
+            // 设置闹铃音频数据源，并准备播放
+            mPlayer.setDataSource(this, url);
+            mPlayer.prepare();
+            mPlayer.setLooping(true); // 设置闹铃音循环播放
+            mPlayer.start();  // 开始播放
+        } catch (IllegalArgumentException | SecurityException | IllegalStateException | IOException e) {
+            // 捕获并打印异常
+            e.printStackTrace();
+        }
+    }
+
+    // 显示提示操作对话框
+    private void showActionDialog() {
+        AlertDialog.Builder dialog = new AlertDialog.Builder(this);
+        dialog.setTitle(R.string.app_name);  // 设置对话框标题为应用名称
+        dialog.setMessage(mSnippet);         // 显示笔记的简短摘要
+        dialog.setPositiveButton(R.string.notealert_ok, this); // 设置“确定”按钮
+        // 如果屏幕开启，设置“进入”按钮
+        if (isScreenOn()) {
+            dialog.setNegativeButton(R.string.notealert_enter, this);
+        }
+        dialog.show().setOnDismissListener(this); // 显示对话框并设置监听器
+    }
+
+    // 处理按钮点击事件
+    public void onClick(DialogInterface dialog, int which) {
+        switch (which) {
+            case DialogInterface.BUTTON_NEGATIVE:
+                // 如果点击了“进入”按钮，启动编辑笔记活动
+                Intent intent = new Intent(this, NoteEditActivity.class);
+                intent.setAction(Intent.ACTION_VIEW); // 设置意图为查看笔记
+                intent.putExtra(Intent.EXTRA_UID, mNoteId); // 传递笔记 ID
+                startActivity(intent); // 启动活动
+                break;
+            default:
+                break;
+        }
+    }
+
+    // 对话框关闭时停止播放闹铃音
+    public void onDismiss(DialogInterface dialog) {
+        stopAlarmSound();
+        finish(); // 结束当前活动
+    }
+
+    // 停止播放闹铃音
+    private void stopAlarmSound() {
+        if (mPlayer != null) {
+            mPlayer.stop();  // 停止播放
+            mPlayer.release();  // 释放播放器资源
+            mPlayer = null; // 清空播放器对象
+        }
+    }
+}

src/AlarmInitReceiver.java

@@ -0,0 +1,81 @@
+/*
+ * 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;           // 引入AlarmManager，用于设置系统闹铃
+import android.app.PendingIntent;         // 引入PendingIntent，用于延迟执行的操作
+import android.content.BroadcastReceiver; // 引入广播接收器，监听系统广播
+import android.content.ContentUris;      // 引入ContentUris，用于构造URI
+import android.content.Context;          // 引入Context，用于访问应用环境
+import android.content.Intent;           // 引入Intent，用于启动其他活动或服务
+import android.database.Cursor;          // 引入Cursor，用于查询数据库结果
+
+import net.micode.notes.data.Notes;     // 引入Notes类，表示笔记相关的数据模型
+import net.micode.notes.data.Notes.NoteColumns;  // 引入NoteColumns类，表示笔记数据表的字段
+
+public class AlarmInitReceiver extends BroadcastReceiver {
+
+    // 定义查询数据库时需要的字段，ID和警报日期
+    private static final String [] PROJECTION = new String [] {
+        NoteColumns.ID,             // 笔记的ID
+        NoteColumns.ALERTED_DATE    // 笔记的警报日期
+    };
+
+    private static final int COLUMN_ID = 0;                  // 表示ID字段的索引
+    private static final int COLUMN_ALERTED_DATE = 1;        // 表示警报日期字段的索引
+
+    @Override
+    public void onReceive(Context context, Intent intent) {
+        // 获取当前系统时间
+        long currentDate = System.currentTimeMillis();
+
+        // 查询数据库，获取那些警报日期大于当前时间的笔记
+        Cursor c = context.getContentResolver().query(Notes.CONTENT_NOTE_URI,  // 笔记内容提供者的URI
+                PROJECTION,  // 查询的字段（ID和警报日期）
+                NoteColumns.ALERTED_DATE + ">? AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE, // 查询条件：警报日期大于当前时间，且类型是笔记
+                new String[] { String.valueOf(currentDate) }, // 当前时间作为查询条件
+                null);  // 排序方式为空
+
+        // 如果查询结果不为空
+        if (c != null) {
+            // 如果数据库中存在符合条件的记录，遍历每条记录
+            if (c.moveToFirst()) {
+                do {
+                    long alertDate = c.getLong(COLUMN_ALERTED_DATE);  // 获取当前笔记的警报日期
+
+                    // 创建一个Intent，指定接收广播的类
+                    Intent sender = new Intent(context, AlarmReceiver.class);
+                    // 设置Intent的Data为当前笔记的URI
+                    sender.setData(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, c.getLong(COLUMN_ID)));
+
+                    // 创建一个PendingIntent，用于延迟发送广播
+                    PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, sender, 0);
+
+                    // 获取系统的AlarmManager服务
+                    AlarmManager alermManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
+
+                    // 设置闹铃，使用RTC_WAKEUP触发闹铃，唤醒设备并在指定时间触发广播
+                    alermManager.set(AlarmManager.RTC_WAKEUP, alertDate, pendingIntent);
+
+                } while (c.moveToNext()); // 继续处理下一条记录
+            }
+
+            // 关闭游标，释放数据库资源
+            c.close();
+        }
+    }
+}

src/AlarmReceiver.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.ui;
+
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+
+/**
+ * AlarmReceiver 类接收并处理广播消息。
+ * 当接收到某个广播时，它会启动 AlarmAlertActivity。
+ */
+public class AlarmReceiver extends BroadcastReceiver {
+
+    /**
+     * 当接收到广播时，执行该方法。
+     * 该方法会启动 AlarmAlertActivity，显示提醒内容。
+     *
+     * @param context 当前的上下文对象
+     * @param intent  接收到的广播消息意图
+     */
+    @Override
+    public void onReceive(Context context, Intent intent) {
+        // 设置 intent 的目标活动为 AlarmAlertActivity
+        intent.setClass(context, AlarmAlertActivity.class);
+        
+        // 添加 FLAG 来启动新的任务栈，这样 AlarmAlertActivity 会作为一个新的活动启动
+        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+        
+        // 启动 AlarmAlertActivity
+        context.startActivity(intent);
+    }
+}

src/BackupUtils.java

@@ -0,0 +1,297 @@
+/*
+ * 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";
+    // 单例模式，确保只有一个BackupUtils实例
+    private static BackupUtils sInstance;
+
+    // 获取BackupUtils的单例实例
+    public static synchronized BackupUtils getInstance(Context context) {
+        if (sInstance == null) {
+            sInstance = new BackupUtils(context);
+        }
+        return sInstance;
+    }
+
+    /**
+     * 备份或恢复状态标识符
+     */
+    // SD卡未挂载
+    public static final int STATE_SD_CARD_UNMOUONTED           = 0;
+    // 备份文件不存在
+    public static final int STATE_BACKUP_FILE_NOT_EXIST        = 1;
+    // 数据格式损坏，可能被其他程序修改过
+    public static final int STATE_DATA_DESTROIED               = 2;
+    // 在备份或恢复过程中发生了运行时异常
+    public static final int STATE_SYSTEM_ERROR                 = 3;
+    // 备份或恢复成功
+    public static final int STATE_SUCCESS                      = 4;
+
+    private TextExport mTextExport;
+
+    // 构造函数，初始化TextExport类
+    private BackupUtils(Context context) {
+        mTextExport = new TextExport(context);
+    }
+
+    // 检查外部存储（SD卡）是否可用
+    private static boolean externalStorageAvailable() {
+        return Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState());
+    }
+
+    // 导出笔记为文本格式
+    public int exportToText() {
+        return mTextExport.exportToText();
+    }
+
+    // 获取导出的文本文件名
+    public String getExportedTextFileName() {
+        return mTextExport.mFileName;
+    }
+
+    // 获取导出的文本文件所在的目录
+    public String getExportedTextFileDir() {
+        return mTextExport.mFileDirectory;
+    }
+
+    // 内部类，用于处理笔记的文本导出
+    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;
+
+        // 构造函数，初始化格式化字符串和上下文
+        public TextExport(Context context) {
+            TEXT_FORMAT = context.getResources().getStringArray(R.array.format_for_exported_note);
+            mContext = context;
+            mFileName = "";
+            mFileDirectory = "";
+        }
+
+        // 根据格式ID获取相应的格式化字符串
+        private String getFormat(int id) {
+            return TEXT_FORMAT[id];
+        }
+
+        /**
+         * 将指定文件夹内的笔记导出为文本格式
+         * @param folderId 文件夹的ID
+         * @param ps 输出流，用于写入导出的数据
+         */
+        private void exportFolderToText(String folderId, PrintStream ps) {
+            // 查询属于该文件夹的笔记
+            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 {
+                        // 打印笔记的最后修改日期
+                        ps.println(String.format(getFormat(FORMAT_NOTE_DATE), DateFormat.format(
+                                mContext.getString(R.string.format_datetime_mdhm),
+                                notesCursor.getLong(NOTE_COLUMN_MODIFIED_DATE))));
+                        // 查询与该笔记相关的数据
+                        String noteId = notesCursor.getString(NOTE_COLUMN_ID);
+                        exportNoteToText(noteId, ps);
+                    } while (notesCursor.moveToNext());
+                }
+                notesCursor.close();
+            }
+        }
+
+        /**
+         * 将指定笔记的内容导出为文本格式
+         * @param noteId 笔记的ID
+         * @param ps 输出流，用于写入导出的数据
+         */
+        private void exportNoteToText(String noteId, PrintStream ps) {
+            // 查询与该笔记相关的数据
+            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)) {
+                            // 导出电话记录相关信息
+                            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));
+                            }
+                            // 打印电话日期
+                            ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT), DateFormat
+                                    .format(mContext.getString(R.string.format_datetime_mdhm),
+                                            callDate)));
+                            // 打印电话记录的地点
+                            if (!TextUtils.isEmpty(location)) {
+                                ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT),
+                                        location));
+                            }
+                        } else if (DataConstants.NOTE.equals(mimeType)) {
+                            // 导出普通笔记内容
+                            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();
+            }
+            // 在每个笔记之间打印一个分隔符
+            try {
+                ps.write(new byte[] {
+                        Character.LINE_SEPARATOR, Character.LETTER_NUMBER
+                });
+            } catch (IOException e) {
+                Log.e(TAG, e.toString());
+            }
+        }
+
+        /**
+         * 将笔记导出为用户可读的文本格式
+         */
+        public int exportToText() {
+            if (!externalStorageAvailable()) {
+                Log.d(TAG, "SD卡未挂载");
+                return STATE_SD_CARD_UNMOUONTED;
+            }
+
+            PrintStream ps = getExportToTextPrintStream();
+            if (ps == null) {
+                Log.e(TAG, "获取输出流失败");
+                return STATE_SYSTEM_ERROR;
+            }
+
+            // 首先导出文件夹及其笔记
+            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 {
+                        // 打印文件夹的名称
+                        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));
+                            exportFolderToText(folderCursor.getString(NOTE_COLUMN_ID), ps);
+                        }
+                    } while (folderCursor.moveToNext());
+                }
+                folderCursor.close();
+            }
+
+            ps.close();
+            return STATE_SUCCESS;
+        }
+
+        // 获取导出文本的输出流
+        private PrintStream getExportToTextPrintStream() {
+            // 获取文件路径
+            String path = Environment.getExternalStorageDirectory() + "/notesBackup";
+            File dir = new File(path);
+            if (!dir.exists()) {
+                if (!dir.mkdirs()) {
+                    return null;
+                }
+            }
+
+            // 设置输出文件路径
+            mFileName = "NotesBackup_" + System.currentTimeMillis() + ".txt";
+            mFileDirectory = path;
+            File file = new File(path, mFileName);
+
+            try {
+                FileOutputStream fos = new FileOutputStream(file);
+                return new PrintStream(fos);
+            } catch (FileNotFoundException e) {
+                Log.e(TAG, e.toString());
+                return null;
+            }
+        }
+    }
+}

src/Contact.java

@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.data;
+
+import android.content.Context;
+import android.database.Cursor;
+import android.provider.ContactsContract.CommonDataKinds.Phone;
+import android.provider.ContactsContract.Data;
+import android.telephony.PhoneNumberUtils;
+import android.util.Log;
+
+import java.util.HashMap;
+
+public class Contact {
+    // 静态缓存，用于存储已查询过的电话号码对应的联系人姓名
+    private static HashMap<String, String> sContactCache;
+    // 用于日志记录的标签
+    private static final String TAG = "Contact";
+
+    // 查询条件，用于根据电话号码查询联系人姓名
+    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 = '+')";
+
+    /**
+     * 获取电话号码对应的联系人姓名
+     * @param context 应用程序的上下文
+     * @param phoneNumber 要查询的电话号码
+     * @return 返回电话号码对应的联系人姓名，如果找不到则返回null
+     */
+    public static String getContact(Context context, String phoneNumber) {
+        // 初始化缓存
+        if(sContactCache == null) {
+            sContactCache = new HashMap<String, String>();
+        }
+
+        // 如果缓存中已经有该电话号码的联系人信息，直接返回
+        if(sContactCache.containsKey(phoneNumber)) {
+            return sContactCache.get(phoneNumber);
+        }
+
+        // 使用电话号码生成查询条件
+        String selection = CALLER_ID_SELECTION.replace("+",
+                PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));
+
+        // 查询联系人信息
+        Cursor cursor = context.getContentResolver().query(
+                Data.CONTENT_URI,
+                new String [] { Phone.DISPLAY_NAME },  // 需要获取的字段，这里是联系人姓名
+                selection,  // 查询条件
+                new String[] { phoneNumber },  // 查询参数，填充到查询条件中
+                null);  // 排序方式，null表示不排序
+
+        // 检查查询结果并返回联系人姓名
+        if (cursor != null && cursor.moveToFirst()) {
+            try {
+                String name = cursor.getString(0);  // 获取查询到的联系人姓名
+                sContactCache.put(phoneNumber, name);  // 将结果缓存起来
+                return name;  // 返回联系人姓名
+            } catch (IndexOutOfBoundsException e) {
+                // 捕捉异常并记录错误日志
+                Log.e(TAG, " Cursor get string error " + e.toString());
+                return null;
+            } finally {
+                // 关闭游标，释放资源
+                cursor.close();
+            }
+        } else {
+            // 如果没有匹配的联系人，记录日志并返回null
+            Log.d(TAG, "No contact matched with number:" + phoneNumber);
+            return null;
+        }
+    }
+}

src/DataUtils.java

@@ -0,0 +1,311 @@
+/*
+ * 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";
+    
+    // 批量删除笔记
+    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) {
+            // 如果是根文件夹，则不允许删除
+            if(id == Notes.ID_ROOT_FOLDER) {
+                Log.e(TAG, "Don't delete system folder root");
+                continue;
+            }
+            // 构建删除操作
+            ContentProviderOperation.Builder builder = ContentProviderOperation
+                    .newDelete(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id));
+            operationList.add(builder.build());
+        }
+        try {
+            // 执行批量操作
+            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;
+    }
+
+    // 将笔记从一个文件夹移动到另一个文件夹
+    public static void moveNoteToFoler(ContentResolver resolver, long id, long srcFolderId, long desFolderId) {
+        ContentValues values = new ContentValues();
+        values.put(NoteColumns.PARENT_ID, desFolderId);  // 设置目标文件夹ID
+        values.put(NoteColumns.ORIGIN_PARENT_ID, srcFolderId);  // 设置原文件夹ID
+        values.put(NoteColumns.LOCAL_MODIFIED, 1);  // 标记为已修改
+        resolver.update(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id), values, null, null);
+    }
+
+    // 批量将笔记移动到指定的文件夹
+    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) {
+            // 构建更新操作
+            ContentProviderOperation.Builder builder = ContentProviderOperation
+                    .newUpdate(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id));
+            builder.withValue(NoteColumns.PARENT_ID, folderId);  // 设置目标文件夹ID
+            builder.withValue(NoteColumns.LOCAL_MODIFIED, 1);  // 标记为已修改
+            operationList.add(builder.build());
+        }
+
+        try {
+            // 执行批量操作
+            ContentProviderResult[] results = resolver.applyBatch(Notes.AUTHORITY, operationList);
+            if (results == null || results.length == 0 || results[0] == null) {
+                Log.d(TAG, "move notes failed, ids:" + ids.toString());
+                return false;
+            }
+            return true;
+        } catch (RemoteException e) {
+            Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));
+        } catch (OperationApplicationException e) {
+            Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));
+        }
+        return false;
+    }
+
+    /**
+     * 获取所有非系统文件夹的数量
+     */
+    public static int getUserFolderCount(ContentResolver resolver) {
+        Cursor cursor = resolver.query(Notes.CONTENT_NOTE_URI,
+                new String[] { "COUNT(*)" },
+                NoteColumns.TYPE + "=? AND " + NoteColumns.PARENT_ID + "<>?",
+                new String[] { String.valueOf(Notes.TYPE_FOLDER), String.valueOf(Notes.ID_TRASH_FOLER)},
+                null);
+
+        int count = 0;
+        if (cursor != null) {
+            if (cursor.moveToFirst()) {
+                try {
+                    count = cursor.getInt(0);
+                } catch (IndexOutOfBoundsException e) {
+                    Log.e(TAG, "get folder count failed:" + e.toString());
+                } finally {
+                    cursor.close();
+                }
+            }
+        }
+        return count;
+    }
+
+    // 检查指定笔记是否存在并且可见（非回收站）
+    public static boolean visibleInNoteDatabase(ContentResolver resolver, long noteId, int type) {
+        Cursor cursor = resolver.query(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId),
+                null,
+                NoteColumns.TYPE + "=? AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER,
+                new String [] {String.valueOf(type)},
+                null);
+
+        boolean exist = false;
+        if (cursor != null) {
+            if (cursor.getCount() > 0) {
+                exist = true;
+            }
+            cursor.close();
+        }
+        return exist;
+    }
+
+    // 检查笔记是否存在
+    public static boolean existInNoteDatabase(ContentResolver resolver, long noteId) {
+        Cursor cursor = resolver.query(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId),
+                null, null, null, null);
+
+        boolean exist = false;
+        if (cursor != null) {
+            if (cursor.getCount() > 0) {
+                exist = true;
+            }
+            cursor.close();
+        }
+        return exist;
+    }
+
+    // 检查数据是否存在
+    public static boolean existInDataDatabase(ContentResolver resolver, long dataId) {
+        Cursor cursor = resolver.query(ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId),
+                null, null, null, null);
+
+        boolean exist = false;
+        if (cursor != null) {
+            if (cursor.getCount() > 0) {
+                exist = true;
+            }
+            cursor.close();
+        }
+        return exist;
+    }
+
+    // 检查文件夹名称是否已存在
+    public static boolean checkVisibleFolderName(ContentResolver resolver, String name) {
+        Cursor cursor = resolver.query(Notes.CONTENT_NOTE_URI, null,
+                NoteColumns.TYPE + "=" + Notes.TYPE_FOLDER +
+                " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER +
+                " AND " + NoteColumns.SNIPPET + "=?",
+                new String[] { name }, null);
+        boolean exist = false;
+        if (cursor != null) {
+            if (cursor.getCount() > 0) {
+                exist = true;
+            }
+            cursor.close();
+        }
+        return exist;
+    }
+
+    // 获取指定文件夹中的小部件（AppWidget）属性
+    public static HashSet<AppWidgetAttribute> getFolderNoteWidget(ContentResolver resolver, long folderId) {
+        Cursor c = resolver.query(Notes.CONTENT_NOTE_URI,
+                new String[] { NoteColumns.WIDGET_ID, NoteColumns.WIDGET_TYPE },
+                NoteColumns.PARENT_ID + "=?",
+                new String[] { String.valueOf(folderId) },
+                null);
+
+        HashSet<AppWidgetAttribute> set = null;
+        if (c != null) {
+            if (c.moveToFirst()) {
+                set = new HashSet<AppWidgetAttribute>();
+                do {
+                    try {
+                        AppWidgetAttribute widget = new AppWidgetAttribute();
+                        widget.widgetId = c.getInt(0);
+                        widget.widgetType = c.getInt(1);
+                        set.add(widget);
+                    } catch (IndexOutOfBoundsException e) {
+                        Log.e(TAG, e.toString());
+                    }
+                } while (c.moveToNext());
+            }
+            c.close();
+        }
+        return set;
+    }
+
+    // 根据笔记ID获取通话记录的电话号码
+    public static String getCallNumberByNoteId(ContentResolver resolver, long noteId) {
+        Cursor cursor = resolver.query(Notes.CONTENT_DATA_URI,
+                new String [] { CallNote.PHONE_NUMBER },
+                CallNote.NOTE_ID + "=? AND " + CallNote.MIME_TYPE + "=?",
+                new String [] { String.valueOf(noteId), CallNote.CONTENT_ITEM_TYPE },
+                null);
+
+        if (cursor != null && cursor.moveToFirst()) {
+            try {
+                return cursor.getString(0);
+            } catch (IndexOutOfBoundsException e) {
+                Log.e(TAG, "Get call number fails " + e.toString());
+            } finally {
+                cursor.close();
+            }
+        }
+        return "";
+    }
+
+    // 根据电话号和通话日期获取对应的笔记ID
+    public static long getNoteIdByPhoneNumberAndCallDate(ContentResolver resolver, String phoneNumber, long callDate) {
+        Cursor cursor = resolver.query(Notes.CONTENT_DATA_URI,
+                new String [] { CallNote.NOTE_ID },
+                CallNote.CALL_DATE + "=? AND " + CallNote.MIME_TYPE + "=? AND PHONE_NUMBERS_EQUAL("
+                + CallNote.PHONE_NUMBER + ",?)",
+                new String [] { String.valueOf(callDate), CallNote.CONTENT_ITEM_TYPE, phoneNumber },
+                null);
+
+        if (cursor != null) {
+            if (cursor.moveToFirst()) {
+                try {
+                    return cursor.getLong(0);
+                } catch (IndexOutOfBoundsException e) {
+                    Log.e(TAG, "Get call note id fails " + e.toString());
+                }
+            }
+            cursor.close();
+        }
+        return 0;
+    }
+
+    // 根据笔记ID获取摘要
+    public static String getSnippetById(ContentResolver resolver, long noteId) {
+        Cursor cursor = resolver.query(Notes.CONTENT_NOTE_URI,
+                new String [] { NoteColumns.SNIPPET },
+                NoteColumns.ID + "=?",
+                new String [] { String.valueOf(noteId)},
+                null);
+
+        if (cursor != null) {
+            String snippet = "";
+            if (cursor.moveToFirst()) {
+                snippet = cursor.getString(0);
+            }
+            cursor.close();
+            return snippet;
+        }
+        throw new IllegalArgumentException("Note is not found with id: " + noteId);
+    }
+
+    // 格式化笔记摘要，去除多余的空格和换行
+    public static String getFormattedSnippet(String snippet) {
+        if (snippet != null) {
+            snippet = snippet.trim();
+            int index = snippet.indexOf('\n');
+            if (index != -1) {
+                snippet = snippet.substring(0, index);
+            }
+        }
+        return snippet;
+    }
+}

src/DateTimePicker.java

@@ -0,0 +1,437 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui;
+
+import java.text.DateFormatSymbols;
+import java.util.Calendar;
+
+import net.micode.notes.R;
+
+import android.content.Context;
+import android.text.format.DateFormat;
+import android.view.View;
+import android.widget.FrameLayout;
+import android.widget.NumberPicker;
+
+/**
+ * 自定义的日期时间选择器组件。
+ * 提供日期、小时、分钟和AM/PM的选择功能。
+ */
+public class DateTimePicker extends FrameLayout {
+
+    // 常量定义，用于限制控件选择的值
+    private static final boolean DEFAULT_ENABLE_STATE = true;
+    private static final int HOURS_IN_HALF_DAY = 12;  // 半天小时数
+    private static final int HOURS_IN_ALL_DAY = 24;   // 一天的小时数
+    private static final int DAYS_IN_ALL_WEEK = 7;    // 一周的天数
+    private static final int DATE_SPINNER_MIN_VAL = 0; // 日期选择器最小值
+    private static final int DATE_SPINNER_MAX_VAL = DAYS_IN_ALL_WEEK - 1;  // 日期选择器最大值
+    private static final int HOUR_SPINNER_MIN_VAL_24_HOUR_VIEW = 0;  // 24小时制小时选择器最小值
+    private static final int HOUR_SPINNER_MAX_VAL_24_HOUR_VIEW = 23; // 24小时制小时选择器最大值
+    private static final int HOUR_SPINNER_MIN_VAL_12_HOUR_VIEW = 1;  // 12小时制小时选择器最小值
+    private static final int HOUR_SPINNER_MAX_VAL_12_HOUR_VIEW = 12; // 12小时制小时选择器最大值
+    private static final int MINUT_SPINNER_MIN_VAL = 0;  // 分钟选择器最小值
+    private static final int MINUT_SPINNER_MAX_VAL = 59; // 分钟选择器最大值
+    private static final int AMPM_SPINNER_MIN_VAL = 0;    // AM/PM选择器最小值
+    private static final int AMPM_SPINNER_MAX_VAL = 1;    // AM/PM选择器最大值
+
+    // 控件定义
+    private final NumberPicker mDateSpinner;  // 日期选择器
+    private final NumberPicker mHourSpinner;  // 小时选择器
+    private final NumberPicker mMinuteSpinner; // 分钟选择器
+    private final NumberPicker mAmPmSpinner;  // AM/PM选择器
+    private Calendar mDate;  // 存储当前日期和时间的 Calendar 对象
+
+    // 日期显示的值数组
+    private String[] mDateDisplayValues = new String[DAYS_IN_ALL_WEEK];
+
+    // 当前是 AM 还是 PM
+    private boolean mIsAm;
+
+    // 是否为 24 小时制
+    private boolean mIs24HourView;
+
+    // 控件是否可用
+    private boolean mIsEnabled = DEFAULT_ENABLE_STATE;
+
+    // 初始化状态
+    private boolean mInitialising;
+
+    // 日期时间变化监听器
+    private OnDateTimeChangedListener mOnDateTimeChangedListener;
+
+    // 日期选择器值变化监听器
+    private NumberPicker.OnValueChangeListener mOnDateChangedListener = new NumberPicker.OnValueChangeListener() {
+        @Override
+        public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
+            // 更新日期
+            mDate.add(Calendar.DAY_OF_YEAR, newVal - oldVal);
+            updateDateControl();  // 更新日期选择器
+            onDateTimeChanged();  // 通知日期时间变化
+        }
+    };
+
+    // 小时选择器值变化监听器
+    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) {
+                // 12小时制模式下，处理AM/PM的变化
+                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();  // 更新AM/PM选择器
+                }
+            } else {
+                // 24小时制模式下，处理日期变化
+                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;
+                }
+            }
+            // 更新小时
+            int newHour = mHourSpinner.getValue() % HOURS_IN_HALF_DAY + (mIsAm ? 0 : HOURS_IN_HALF_DAY);
+            mDate.set(Calendar.HOUR_OF_DAY, newHour);
+            onDateTimeChanged();  // 通知日期时间变化
+            // 如果日期发生变化，更新年份、月份、日期
+            if (isDateChanged) {
+                setCurrentYear(cal.get(Calendar.YEAR));
+                setCurrentMonth(cal.get(Calendar.MONTH));
+                setCurrentDay(cal.get(Calendar.DAY_OF_MONTH));
+            }
+        }
+    };
+
+    // 分钟选择器值变化监听器
+    private NumberPicker.OnValueChangeListener mOnMinuteChangedListener = new NumberPicker.OnValueChangeListener() {
+        @Override
+        public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
+            // 更新分钟
+            mDate.set(Calendar.MINUTE, newVal);
+            onDateTimeChanged();  // 通知日期时间变化
+        }
+    };
+
+    // AM/PM选择器值变化监听器
+    private NumberPicker.OnValueChangeListener mOnAmPmChangedListener = new NumberPicker.OnValueChangeListener() {
+        @Override
+        public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
+            mIsAm = !mIsAm;
+            // 根据AM/PM的选择，调整小时
+            if (mIsAm) {
+                mDate.add(Calendar.HOUR_OF_DAY, -HOURS_IN_HALF_DAY);
+            } else {
+                mDate.add(Calendar.HOUR_OF_DAY, HOURS_IN_HALF_DAY);
+            }
+            updateAmPmControl();  // 更新AM/PM控制
+            onDateTimeChanged();  // 通知日期时间变化
+        }
+    };
+
+    // 日期时间变化监听器接口
+    public interface OnDateTimeChangedListener {
+        void onDateTimeChanged(DateTimePicker view, int year, int month,
+                               int dayOfMonth, int hourOfDay, int minute);
+    }
+
+    // 构造函数，初始化日期时间选择器
+    public DateTimePicker(Context context) {
+        this(context, System.currentTimeMillis());
+    }
+
+    // 构造函数，初始化日期时间选择器，并传入日期
+    public DateTimePicker(Context context, long date) {
+        this(context, date, DateFormat.is24HourFormat(context));
+    }
+
+    // 构造函数，初始化日期时间选择器，并传入日期和是否24小时制
+    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); // 加载自定义布局
+
+        // 初始化日期选择器控件
+        mDateSpinner = (NumberPicker) findViewById(R.id.date);
+        mDateSpinner.setMinValue(DATE_SPINNER_MIN_VAL);
+        mDateSpinner.setMaxValue(DATE_SPINNER_MAX_VAL);
+        mDateSpinner.setOnValueChangedListener(mOnDateChangedListener);
+
+        // 初始化小时选择器控件
+        mHourSpinner = (NumberPicker) findViewById(R.id.hour);
+        mHourSpinner.setOnValueChangedListener(mOnHourChangedListener);
+        
+        // 初始化分钟选择器控件
+        mMinuteSpinner = (NumberPicker) findViewById(R.id.minute);
+        mMinuteSpinner.setMinValue(MINUT_SPINNER_MIN_VAL);
+        mMinuteSpinner.setMaxValue(MINUT_SPINNER_MAX_VAL);
+        mMinuteSpinner.setOnLongPressUpdateInterval(100);
+        mMinuteSpinner.setOnValueChangedListener(mOnMinuteChangedListener);
+
+        // 初始化AM/PM选择器控件
+        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);
+
+        // 更新控件为初始状态
+        updateDateControl();
+        updateHourControl();
+        updateAmPmControl();
+
+        // 设置24小时制模式
+        set24HourView(is24HourView);
+
+        // 设置当前时间
+        setCurrentDate(date);
+
+        setEnabled(isEnabled());  // 设置是否启用
+
+        // 设置控件的内容描述
+        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;
+    }
+
+    // 获取当前日期的时间戳
+    public long getCurrentDateInTimeMillis() {
+        return mDate.getTimeInMillis();
+    }
+
+    // 设置当前日期时间
+    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));
+    }
+
+    // 设置当前日期和时间
+    public void setCurrentDate(int year, int month, int dayOfMonth, int hourOfDay, int minute) {
+        setCurrentYear(year);
+        setCurrentMonth(month);
+        setCurrentDay(dayOfMonth);
+        setCurrentHour(hourOfDay);
+        setCurrentMinute(minute);
+    }
+
+    // 获取当前年份
+    public int getCurrentYear() {
+        return mDate.get(Calendar.YEAR);
+    }
+
+    // 设置当前年份
+    public void setCurrentYear(int year) {
+        if (!mInitialising && year == getCurrentYear()) {
+            return;
+        }
+        mDate.set(Calendar.YEAR, year);
+        updateDateControl();
+        onDateTimeChanged();
+    }
+
+    // 获取当前月份
+    public int getCurrentMonth() {
+        return mDate.get(Calendar.MONTH);
+    }
+
+    // 设置当前月份
+    public void setCurrentMonth(int month) {
+        if (!mInitialising && month == getCurrentMonth()) {
+            return;
+        }
+        mDate.set(Calendar.MONTH, month);
+        updateDateControl();
+        onDateTimeChanged();
+    }
+
+    // 获取当前日期
+    public int getCurrentDay() {
+        return mDate.get(Calendar.DAY_OF_MONTH);
+    }
+
+    // 设置当前日期
+    public void setCurrentDay(int dayOfMonth) {
+        if (!mInitialising && dayOfMonth == getCurrentDay()) {
+            return;
+        }
+        mDate.set(Calendar.DAY_OF_MONTH, dayOfMonth);
+        updateDateControl();
+        onDateTimeChanged();
+    }
+
+    // 获取当前小时（24小时制）
+    public int getCurrentHourOfDay() {
+        return mDate.get(Calendar.HOUR_OF_DAY);
+    }
+
+    // 获取当前小时（12小时制或24小时制）
+    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;
+            }
+        }
+    }
+
+    // 设置当前小时（24小时制）
+    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();
+    }
+
+    // 获取当前分钟
+    public int getCurrentMinute() {
+        return mDate.get(Calendar.MINUTE);
+    }
+
+    // 设置当前分钟
+    public void setCurrentMinute(int minute) {
+        if (!mInitialising && minute == getCurrentMinute()) {
+            return;
+        }
+        mMinuteSpinner.setValue(minute);
+        mDate.set(Calendar.MINUTE, minute);
+        onDateTimeChanged();
+    }
+
+    // 判断是否为24小时制
+    public boolean is24HourView () {
+        return mIs24HourView;
+    }
+
+    // 设置是否为24小时制或AM/PM制
+    public void set24HourView(boolean is24HourView) {
+        if (mIs24HourView == is24HourView) {
+            return;
+        }
+        mIs24HourView = is24HourView;
+        mAmPmSpinner.setVisibility(is24HourView ? View.GONE : View.VISIBLE);
+        int hour = getCurrentHourOfDay();
+        updateHourControl();
+        setCurrentHour(hour);
+        updateAmPmControl();
+    }
+
+    // 更新日期选择器的显示内容
+    private void updateDateControl() {
+        Calendar cal = Calendar.getInstance();
+        cal.setTimeInMillis(mDate.getTimeInMillis());
+        cal.add(Calendar.DAY_OF_YEAR, -DAYS_IN_ALL_WEEK / 2 - 1);
+        mDateSpinner.setDisplayedValues(null);
+        for (int i = 0; i < DAYS_IN_ALL_WEEK; ++i) {
+            cal.add(Calendar.DAY_OF_YEAR, 1);
+            mDateDisplayValues[i] = (String) DateFormat.format("MM.dd EEEE", cal);
+        }
+        mDateSpinner.setDisplayedValues(mDateDisplayValues);
+        mDateSpinner.setValue(DAYS_IN_ALL_WEEK / 2);
+        mDateSpinner.invalidate();
+    }
+
+    // 更新AM/PM选择器
+    private void updateAmPmControl() {
+        if (mIs24HourView) {
+            mAmPmSpinner.setVisibility(View.GONE);
+        } else {
+            int index = mIsAm ? Calendar.AM : Calendar.PM;
+            mAmPmSpinner.setValue(index);
+            mAmPmSpinner.setVisibility(View.VISIBLE);
+        }
+    }
+
+    // 更新小时选择器
+    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);
+        }
+    }
+
+    // 设置日期时间变化的回调函数
+    public void setOnDateTimeChangedListener(OnDateTimeChangedListener callback) {
+        mOnDateTimeChangedListener = callback;
+    }
+
+    // 通知日期时间变化
+    private void onDateTimeChanged() {
+        if (mOnDateTimeChangedListener != null) {
+            mOnDateTimeChangedListener.onDateTimeChanged(this, getCurrentYear(),
+                    getCurrentMonth(), getCurrentDay(), getCurrentHourOfDay(), getCurrentMinute());
+        }
+    }
+}

src/DateTimePickerDialog.java

@@ -0,0 +1,138 @@
+/*
+ * 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;
+
+/**
+ * 自定义的日期时间选择对话框。
+ * 用于选择日期和时间，支持24小时制和12小时制显示。
+ */
+public class DateTimePickerDialog extends AlertDialog implements OnClickListener {
+
+    // 当前选择的日期和时间
+    private Calendar mDate = Calendar.getInstance();
+    // 是否为24小时制
+    private boolean mIs24HourView;
+    // 日期时间选择回调
+    private OnDateTimeSetListener mOnDateTimeSetListener;
+    // 日期时间选择器控件
+    private DateTimePicker mDateTimePicker;
+
+    /**
+     * 日期时间设置回调接口。
+     * 当用户选择完日期时间后，回调此方法。
+     */
+    public interface OnDateTimeSetListener {
+        void OnDateTimeSet(AlertDialog dialog, long date);
+    }
+
+    /**
+     * 构造函数，初始化日期时间选择对话框。
+     * @param context 上下文
+     * @param date 初始日期时间
+     */
+    public DateTimePickerDialog(Context context, long date) {
+        super(context);
+
+        // 创建 DateTimePicker 控件，并设置监听器
+        mDateTimePicker = new DateTimePicker(context);
+        setView(mDateTimePicker);
+        mDateTimePicker.setOnDateTimeChangedListener(new OnDateTimeChangedListener() {
+            // 日期时间改变监听器
+            public void onDateTimeChanged(DateTimePicker view, int year, int month,
+                    int dayOfMonth, int hourOfDay, int minute) {
+                // 更新选中的日期和时间
+                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);
+                // 更新对话框标题显示的日期时间
+                updateTitle(mDate.getTimeInMillis());
+            }
+        });
+
+        // 设置初始日期时间
+        mDate.setTimeInMillis(date);
+        mDate.set(Calendar.SECOND, 0); // 将秒数设置为0
+        mDateTimePicker.setCurrentDate(mDate.getTimeInMillis()); // 初始化日期时间选择器
+
+        // 设置对话框按钮
+        setButton(context.getString(R.string.datetime_dialog_ok), this); // 确定按钮
+        setButton2(context.getString(R.string.datetime_dialog_cancel), (OnClickListener)null); // 取消按钮
+
+        // 设置是否为24小时制
+        set24HourView(DateFormat.is24HourFormat(this.getContext()));
+
+        // 更新对话框标题
+        updateTitle(mDate.getTimeInMillis());
+    }
+
+    /**
+     * 设置是否为24小时制
+     * @param is24HourView 是否为24小时制
+     */
+    public void set24HourView(boolean is24HourView) {
+        mIs24HourView = is24HourView;
+    }
+
+    /**
+     * 设置日期时间设置回调监听器
+     * @param callBack 回调接口
+     */
+    public void setOnDateTimeSetListener(OnDateTimeSetListener callBack) {
+        mOnDateTimeSetListener = callBack;
+    }
+
+    /**
+     * 更新对话框标题，显示当前选择的日期和时间
+     * @param date 当前选择的日期时间
+     */
+    private void updateTitle(long date) {
+        // 设置显示的日期格式，包含年、月、日和时间
+        int flag =
+            DateUtils.FORMAT_SHOW_YEAR |
+            DateUtils.FORMAT_SHOW_DATE |
+            DateUtils.FORMAT_SHOW_TIME;
+        // 如果是24小时制，更新显示格式
+        flag |= mIs24HourView ? DateUtils.FORMAT_24HOUR : DateUtils.FORMAT_12HOUR;
+        // 设置对话框标题为格式化后的日期时间
+        setTitle(DateUtils.formatDateTime(this.getContext(), date, flag));
+    }
+
+    /**
+     * 确定按钮的点击事件处理
+     * 当用户点击确定按钮时，调用回调接口
+     */
+    public void onClick(DialogInterface arg0, int arg1) {
+        if (mOnDateTimeSetListener != null) {
+            // 回调监听器，传递选中的日期时间
+            mOnDateTimeSetListener.OnDateTimeSet(this, mDate.getTimeInMillis());
+        }
+    }
+}

src/DropdownMenu.java

@@ -0,0 +1,94 @@
+/*
+ * 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;
+
+/**
+ * DropdownMenu 类用于实现一个带有下拉菜单的按钮组件。
+ * 按钮点击时会显示一个弹出菜单，菜单项点击时可以设置回调事件。
+ */
+public class DropdownMenu {
+    
+    private Button mButton; // 存储与菜单关联的按钮
+    private PopupMenu mPopupMenu; // 存储弹出菜单对象
+    private Menu mMenu; // 存储菜单对象
+
+    /**
+     * 构造函数，初始化 DropdownMenu。
+     * @param context 上下文对象
+     * @param button 要显示下拉菜单的按钮
+     * @param menuId 菜单资源ID
+     */
+    public DropdownMenu(Context context, Button button, int menuId) {
+        mButton = button;
+        // 设置按钮背景图标（这里使用了一个下拉图标）
+        mButton.setBackgroundResource(R.drawable.dropdown_icon);
+        
+        // 创建一个 PopupMenu 对象，显示在按钮下方
+        mPopupMenu = new PopupMenu(context, mButton);
+        
+        // 获取菜单对象，之后可以对菜单进行操作
+        mMenu = mPopupMenu.getMenu();
+        
+        // 根据给定的菜单ID，加载对应的菜单资源
+        mPopupMenu.getMenuInflater().inflate(menuId, mMenu);
+        
+        // 设置按钮的点击监听器，当点击按钮时显示弹出菜单
+        mButton.setOnClickListener(new OnClickListener() {
+            public void onClick(View v) {
+                mPopupMenu.show(); // 显示弹出菜单
+            }
+        });
+    }
+
+    /**
+     * 设置下拉菜单项的点击监听器。
+     * @param listener 菜单项点击事件监听器
+     */
+    public void setOnDropdownMenuItemClickListener(OnMenuItemClickListener listener) {
+        if (mPopupMenu != null) {
+            mPopupMenu.setOnMenuItemClickListener(listener); // 设置菜单项点击监听器
+        }
+    }
+
+    /**
+     * 根据给定的ID查找菜单项。
+     * @param id 菜单项的ID
+     * @return 找到的菜单项
+     */
+    public MenuItem findItem(int id) {
+        return mMenu.findItem(id); // 查找菜单项
+    }
+
+    /**
+     * 设置按钮的标题文本。
+     * @param title 新的按钮文本
+     */
+    public void setTitle(CharSequence title) {
+        mButton.setText(title); // 设置按钮显示的文本
+    }
+}

src/FoldersListAdapter.java

@@ -0,0 +1,125 @@
+/*
+ * 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;
+
+/**
+ * FoldersListAdapter 类继承自 CursorAdapter，用于显示文件夹列表。
+ * 该适配器根据数据库中的 cursor 数据来显示文件夹的名称，并且可以显示特定的根文件夹名称。
+ */
+public class FoldersListAdapter extends CursorAdapter {
+    
+    // 数据库查询时使用的投影，表示需要从数据库中获取的列
+    public static final String[] PROJECTION = {
+        NoteColumns.ID,     // 文件夹 ID
+        NoteColumns.SNIPPET // 文件夹名称
+    };
+
+    // 表示各列的索引常量
+    public static final int ID_COLUMN = 0;    // ID 列索引
+    public static final int NAME_COLUMN = 1;  // 文件夹名称列索引
+
+    /**
+     * 构造函数，初始化 FoldersListAdapter。
+     * @param context 上下文对象
+     * @param c Cursor 数据源
+     */
+    public FoldersListAdapter(Context context, Cursor c) {
+        super(context, c);
+        // TODO Auto-generated constructor stub
+    }
+
+    /**
+     * 创建一个新的视图用于显示文件夹信息。
+     * 这个方法会在 ListView 需要新的项时调用。
+     * @param context 上下文对象
+     * @param cursor 当前的游标
+     * @param parent 父视图
+     * @return 新的视图
+     */
+    @Override
+    public View newView(Context context, Cursor cursor, ViewGroup parent) {
+        return new FolderListItem(context); // 返回一个新的 FolderListItem 视图
+    }
+
+    /**
+     * 将数据绑定到视图上，显示文件夹的名称。
+     * @param view 视图对象
+     * @param context 上下文对象
+     * @param cursor 当前游标
+     */
+    @Override
+    public void bindView(View view, Context context, Cursor cursor) {
+        if (view instanceof FolderListItem) {
+            // 判断当前文件夹是否是根文件夹，如果是，则显示"父文件夹"文本
+            String folderName = (cursor.getLong(ID_COLUMN) == Notes.ID_ROOT_FOLDER) ? context
+                    .getString(R.string.menu_move_parent_folder) : cursor.getString(NAME_COLUMN);
+            // 将文件夹名称绑定到 FolderListItem 上
+            ((FolderListItem) view).bind(folderName);
+        }
+    }
+
+    /**
+     * 获取指定位置的文件夹名称。
+     * @param context 上下文对象
+     * @param position 文件夹的位置
+     * @return 文件夹名称
+     */
+    public String getFolderName(Context context, int position) {
+        Cursor cursor = (Cursor) getItem(position);
+        // 如果是根文件夹，则返回 "父文件夹" 的名称
+        return (cursor.getLong(ID_COLUMN) == Notes.ID_ROOT_FOLDER) ? context
+                .getString(R.string.menu_move_parent_folder) : cursor.getString(NAME_COLUMN);
+    }
+
+    /**
+     * FolderListItem 是一个用于显示文件夹名称的自定义视图类。
+     */
+    private class FolderListItem extends LinearLayout {
+        private TextView mName; // 显示文件夹名称的 TextView
+
+        /**
+         * 构造函数，初始化 FolderListItem。
+         * @param context 上下文对象
+         */
+        public FolderListItem(Context context) {
+            super(context);
+            // 加载布局文件
+            inflate(context, R.layout.folder_list_item, this);
+            mName = (TextView) findViewById(R.id.tv_folder_name); // 获取文件夹名称的 TextView
+        }
+
+        /**
+         * 将文件夹名称绑定到视图的 TextView 上。
+         * @param name 文件夹名称
+         */
+        public void bind(String name) {
+            mName.setText(name); // 设置文件夹名称
+        }
+    }
+}

src/GTaskASyncTask.java

@@ -0,0 +1,174 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.gtask.remote;
+
+import android.app.Notification;
+import android.app.NotificationManager;
+import android.app.PendingIntent;
+import android.content.Context;
+import android.content.Intent;
+import android.os.AsyncTask;
+
+import net.micode.notes.R;
+import net.micode.notes.ui.NotesListActivity;
+import net.micode.notes.ui.NotesPreferenceActivity;
+
+/**
+ * GTaskASyncTask 类用于异步执行Google任务（GTask）同步操作。
+ * 它继承自 AsyncTask，以便在后台线程中执行耗时的网络操作，
+ * 并通过主线程更新用户界面或发送通知。
+ */
+public class GTaskASyncTask extends AsyncTask<Void, String, Integer> {
+
+    // 用于同步操作的通知ID，确保唯一性。
+    private static final int GTASK_SYNC_NOTIFICATION_ID = 5234235;
+
+    /**
+     * 当同步完成时调用的接口。
+     */
+    public interface OnCompleteListener {
+        void onComplete();
+    }
+
+    // 上下文对象，用于访问应用资源和系统服务。
+    private Context mContext;
+
+    // 管理通知的服务。
+    private NotificationManager mNotifiManager;
+
+    // 负责管理与Google任务交互的任务管理器。
+    private GTaskManager mTaskManager;
+
+    // 同步完成后调用的监听器。
+    private OnCompleteListener mOnCompleteListener;
+
+    /**
+     * 构造一个新的 GTaskASyncTask 实例。
+     * @param context 应用上下文。
+     * @param listener 同步完成后的回调监听器。
+     */
+    public GTaskASyncTask(Context context, OnCompleteListener listener) {
+        mContext = context;
+        mOnCompleteListener = listener;
+        mNotifiManager = (NotificationManager) mContext.getSystemService(Context.NOTIFICATION_SERVICE);
+        mTaskManager = GTaskManager.getInstance();
+    }
+
+    /**
+     * 取消正在进行的同步操作。
+     */
+    public void cancelSync() {
+        mTaskManager.cancelSync();
+    }
+
+    /**
+     * 更新进度信息。
+     * @param message 进度消息文本。
+     */
+    public void publishProgess(String message) {
+        publishProgress(new String[]{message});
+    }
+
+    /**
+     * 显示一个通知给用户。
+     * @param tickerId 通知栏提示文字的资源ID。
+     * @param content 通知内容文本。
+     */
+    private void showNotification(int tickerId, String content) {
+        Notification notification = new Notification(R.drawable.notification, 
+                                                     mContext.getString(tickerId), 
+                                                     System.currentTimeMillis());
+        notification.defaults = Notification.DEFAULT_LIGHTS;
+        notification.flags = Notification.FLAG_AUTO_CANCEL;
+        
+        // 根据同步结果选择不同的PendingIntent
+        PendingIntent pendingIntent;
+        if (tickerId != R.string.ticker_success) {
+            pendingIntent = PendingIntent.getActivity(mContext, 0, 
+                new Intent(mContext, NotesPreferenceActivity.class), 0);
+        } else {
+            pendingIntent = PendingIntent.getActivity(mContext, 0, 
+                new Intent(mContext, NotesListActivity.class), 0);
+        }
+        
+        // 设置通知详情，并显示通知
+        notification.setLatestEventInfo(mContext, mContext.getString(R.string.app_name), content, pendingIntent);
+        mNotifiManager.notify(GTASK_SYNC_NOTIFICATION_ID, notification);
+    }
+
+    /**
+     * 在后台线程中执行的实际同步逻辑。
+     */
+    @Override
+    protected Integer doInBackground(Void... unused) {
+        // 发布登录进度信息
+        publishProgess(mContext.getString(R.string.sync_progress_login, 
+                                          NotesPreferenceActivity.getSyncAccountName(mContext)));
+        // 执行同步操作并返回状态码
+        return mTaskManager.sync(mContext, this);
+    }
+
+    /**
+     * 更新UI线程上的进度。
+     */
+    @Override
+    protected void onProgressUpdate(String... progress) {
+        // 显示同步中的通知
+        showNotification(R.string.ticker_syncing, progress[0]);
+        // 如果上下文是GTaskSyncService，则广播进度信息
+        if (mContext instanceof GTaskSyncService) {
+            ((GTaskSyncService) mContext).sendBroadcast(progress[0]);
+        }
+    }
+
+    /**
+     * 同步完成后，在UI线程上执行此方法。
+     */
+    @Override
+    protected void onPostExecute(Integer result) {
+        // 根据同步结果显示不同通知
+        switch(result) {
+            case GTaskManager.STATE_SUCCESS:
+                showNotification(R.string.ticker_success, 
+                                 mContext.getString(R.string.success_sync_account, mTaskManager.getSyncAccount()));
+                NotesPreferenceActivity.setLastSyncTime(mContext, System.currentTimeMillis());
+                break;
+            case GTaskManager.STATE_NETWORK_ERROR:
+                showNotification(R.string.ticker_fail, 
+                                 mContext.getString(R.string.error_sync_network));
+                break;
+            case GTaskManager.STATE_INTERNAL_ERROR:
+                showNotification(R.string.ticker_fail, 
+                                 mContext.getString(R.string.error_sync_internal));
+                break;
+            case GTaskManager.STATE_SYNC_CANCELLED:
+                showNotification(R.string.ticker_cancel, 
+                                 mContext.getString(R.string.error_sync_cancelled));
+                break;
+        }
+        
+        // 如果存在监听器，则启动新线程调用onComplete方法
+        if (mOnCompleteListener != null) {
+            new Thread(new Runnable() {
+                @Override
+                public void run() {
+                    mOnCompleteListener.onComplete();
+                }
+            }).start();
+        }
+    }
+}

src/GTaskClient.java

@@ -0,0 +1,288 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.gtask.remote;
+
+import android.accounts.Account;
+import android.accounts.AccountManager;
+import android.accounts.AccountManagerFuture;
+import android.app.Activity;
+import android.os.Bundle;
+import android.text.TextUtils;
+import android.util.Log;
+
+import net.micode.notes.gtask.data.Node;
+import net.micode.notes.gtask.data.Task;
+import net.micode.notes.gtask.data.TaskList;
+import net.micode.notes.gtask.exception.ActionFailureException;
+import net.micode.notes.gtask.exception.NetworkFailureException;
+import net.micode.notes.tool.GTaskStringUtils;
+import net.micode.notes.ui.NotesPreferenceActivity;
+
+import org.apache.http.HttpEntity;
+import org.apache.http.HttpResponse;
+import org.apache.http.client.ClientProtocolException;
+import org.apache.http.client.entity.UrlEncodedFormEntity;
+import org.apache.http.client.methods.HttpGet;
+import org.apache.http.client.methods.HttpPost;
+import org.apache.http.cookie.Cookie;
+import org.apache.http.impl.client.BasicCookieStore;
+import org.apache.http.impl.client.DefaultHttpClient;
+import org.apache.http.message.BasicNameValuePair;
+import org.apache.http.params.BasicHttpParams;
+import org.apache.http.params.HttpConnectionParams;
+import org.apache.http.params.HttpParams;
+import org.apache.http.params.HttpProtocolParams;
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.zip.GZIPInputStream;
+import java.util.zip.Inflater;
+import java.util.zip.InflaterInputStream;
+
+// GTaskClient 类用于与 Google Tasks 进行交互，主要包含任务和任务列表的创建、删除、修改等操作
+public class GTaskClient {
+    private static final String TAG = GTaskClient.class.getSimpleName();
+
+    // 定义 GTASK 的 URL 地址
+    private static final String GTASK_URL = "https://mail.google.com/tasks/";
+    private static final String GTASK_GET_URL = "https://mail.google.com/tasks/ig";
+    private static final String GTASK_POST_URL = "https://mail.google.com/tasks/r/ig";
+
+    private static GTaskClient mInstance = null; // 单例对象
+    private DefaultHttpClient mHttpClient;  // HTTP 客户端
+    private String mGetUrl;  // GET 请求 URL
+    private String mPostUrl;  // POST 请求 URL
+    private long mClientVersion;  // 客户端版本
+    private boolean mLoggedin;  // 登录状态
+    private long mLastLoginTime;  // 上次登录时间
+    private int mActionId;  // 操作 ID，用于唯一标识每个操作
+    private Account mAccount;  // 当前登录的 Google 帐号
+    private JSONArray mUpdateArray;  // 更新操作数组
+
+    // 私有化构造方法，避免外部实例化
+    private GTaskClient() {
+        mHttpClient = null;
+        mGetUrl = GTASK_GET_URL;
+        mPostUrl = GTASK_POST_URL;
+        mClientVersion = -1;
+        mLoggedin = false;
+        mLastLoginTime = 0;
+        mActionId = 1;
+        mAccount = null;
+        mUpdateArray = null;
+    }
+
+    // 单例模式获取 GTaskClient 实例
+    public static synchronized GTaskClient getInstance() {
+        if (mInstance == null) {
+            mInstance = new GTaskClient();
+        }
+        return mInstance;
+    }
+
+    // 登录方法，返回是否成功
+    public boolean login(Activity activity) {
+        // 每 5 分钟重新登录一次
+        final long interval = 1000 * 60 * 5;
+        if (mLastLoginTime + interval < System.currentTimeMillis()) {
+            mLoggedin = false;
+        }
+
+        // 如果切换了帐号，也需要重新登录
+        if (mLoggedin && !TextUtils.equals(getSyncAccount().name, NotesPreferenceActivity.getSyncAccountName(activity))) {
+            mLoggedin = false;
+        }
+
+        if (mLoggedin) {
+            Log.d(TAG, "已经登录");
+            return true;
+        }
+
+        mLastLoginTime = System.currentTimeMillis();
+        String authToken = loginGoogleAccount(activity, false);
+        if (authToken == null) {
+            Log.e(TAG, "Google 帐号登录失败");
+            return false;
+        }
+
+        // 如果是自定义域名帐号，需要构建对应的 URL
+        if (!(mAccount.name.toLowerCase().endsWith("gmail.com") || mAccount.name.toLowerCase().endsWith("googlemail.com"))) {
+            StringBuilder url = new StringBuilder(GTASK_URL).append("a/");
+            int index = mAccount.name.indexOf('@') + 1;
+            String suffix = mAccount.name.substring(index);
+            url.append(suffix + "/");
+            mGetUrl = url.toString() + "ig";
+            mPostUrl = url.toString() + "r/ig";
+
+            if (tryToLoginGtask(activity, authToken)) {
+                mLoggedin = true;
+            }
+        }
+
+        // 尝试使用 Google 官方 URL 登录
+        if (!mLoggedin) {
+            mGetUrl = GTASK_GET_URL;
+            mPostUrl = GTASK_POST_URL;
+            if (!tryToLoginGtask(activity, authToken)) {
+                return false;
+            }
+        }
+
+        mLoggedin = true;
+        return true;
+    }
+
+    // 获取授权令牌
+    private String loginGoogleAccount(Activity activity, boolean invalidateToken) {
+        String authToken;
+        AccountManager accountManager = AccountManager.get(activity);
+        Account[] accounts = accountManager.getAccountsByType("com.google");
+
+        if (accounts.length == 0) {
+            Log.e(TAG, "没有可用的 Google 帐号");
+            return null;
+        }
+
+        // 根据设置中的帐号名称来选择帐户
+        String accountName = NotesPreferenceActivity.getSyncAccountName(activity);
+        Account account = null;
+        for (Account a : accounts) {
+            if (a.name.equals(accountName)) {
+                account = a;
+                break;
+            }
+        }
+        if (account != null) {
+            mAccount = account;
+        } else {
+            Log.e(TAG, "无法找到相同名称的帐户");
+            return null;
+        }
+
+        // 获取授权令牌
+        AccountManagerFuture<Bundle> accountManagerFuture = accountManager.getAuthToken(account, "goanna_mobile", null, activity, null, null);
+        try {
+            Bundle authTokenBundle = accountManagerFuture.getResult();
+            authToken = authTokenBundle.getString(AccountManager.KEY_AUTHTOKEN);
+            if (invalidateToken) {
+                accountManager.invalidateAuthToken("com.google", authToken);
+                loginGoogleAccount(activity, false);
+            }
+        } catch (Exception e) {
+            Log.e(TAG, "获取授权令牌失败");
+            authToken = null;
+        }
+
+        return authToken;
+    }
+
+    // 尝试登录 Google 任务
+    private boolean tryToLoginGtask(Activity activity, String authToken) {
+        if (!loginGtask(authToken)) {
+            // 如果授权令牌过期，重新登录
+            authToken = loginGoogleAccount(activity, true);
+            if (authToken == null) {
+                Log.e(TAG, "Google 帐号登录失败");
+                return false;
+            }
+
+            if (!loginGtask(authToken)) {
+                Log.e(TAG, "登录 Google Tasks 失败");
+                return false;
+            }
+        }
+        return true;
+    }
+
+    // 通过授权令牌登录 Google Tasks
+    private boolean loginGtask(String authToken) {
+        int timeoutConnection = 10000;
+        int timeoutSocket = 15000;
+        HttpParams httpParameters = new BasicHttpParams();
+        HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection);
+        HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket);
+        mHttpClient = new DefaultHttpClient(httpParameters);
+        BasicCookieStore localBasicCookieStore = new BasicCookieStore();
+        mHttpClient.setCookieStore(localBasicCookieStore);
+        HttpProtocolParams.setUseExpectContinue(mHttpClient.getParams(), false);
+
+        // 登录 Google 任务
+        try {
+            String loginUrl = mGetUrl + "?auth=" + authToken;
+            HttpGet httpGet = new HttpGet(loginUrl);
+            HttpResponse response = mHttpClient.execute(httpGet);
+
+            // 获取 Cookie
+            List<Cookie> cookies = mHttpClient.getCookieStore().getCookies();
+            boolean hasAuthCookie = false;
+            for (Cookie cookie : cookies) {
+                if (cookie.getName().contains("GTL")) {
+                    hasAuthCookie = true;
+                }
+            }
+            if (!hasAuthCookie) {
+                Log.w(TAG, "未找到授权 Cookie");
+            }
+
+            // 获取客户端版本
+            String resString = getResponseContent(response.getEntity());
+            String jsBegin = "_setup(";
+            String jsEnd = ");";
+
+            int beginIndex = resString.indexOf(jsBegin);
+            int endIndex = resString.indexOf(jsEnd);
+            if (beginIndex != -1 && endIndex != -1) {
+                String jsonString = resString.substring(beginIndex + jsBegin.length(), endIndex);
+                JSONObject jsonObject = new JSONObject(jsonString);
+                mClientVersion = jsonObject.optLong("clientVersion", -1);
+            }
+            return true;
+        } catch (Exception e) {
+            Log.e(TAG, "登录失败：" + e.getMessage());
+            return false;
+        }
+    }
+
+    // 获取 HTTP 响应内容
+    private String getResponseContent(HttpEntity entity) throws IOException {
+        InputStream inputStream = entity.getContent();
+        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
+        StringBuilder stringBuilder = new StringBuilder();
+        String line;
+        while ((line = bufferedReader.readLine()) != null) {
+            stringBuilder.append(line).append("\n");
+        }
+        return stringBuilder.toString();
+    }
+
+    // 获取当前同步的 Google 帐号
+    public Account getSyncAccount() {
+        return mAccount;
+    }
+
+    // 获取已登录状态
+    public boolean isLoggedin() {
+        return mLoggedin;
+    }
+}

src/GTaskManager.java

@@ -0,0 +1,805 @@
+/*
+ * Copyright (c) 2010 - 2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.gtask.remote;
+
+import android.app.Activity;
+import android.content.ContentResolver;
+import android.content.ContentUris;
+import android.content.ContentValues;
+import android.content.Context;
+import android.database.Cursor;
+import android.util.Log;
+
+import net.micode.notes.R;
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.DataColumns;
+import net.micode.notes.data.Notes.NoteColumns;
+import net.micode.notes.gtask.data.MetaData;
+import net.micode.notes.gtask.data.Node;
+import net.micode.notes.gtask.data.SqlNote;
+import net.micode.notes.gtask.data.Task;
+import net.micode.notes.gtask.data.TaskList;
+import net.micode.notes.gtask.exception.ActionFailureException;
+import net.micode.notes.gtask.exception.NetworkFailureException;
+import net.micode.notes.tool.DataUtils;
+import net.micode.notes.tool.GTaskStringUtils;
+
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.Map;
+
+// GTaskManager类用于管理与Google Task的同步操作等相关功能
+public class GTaskManager {
+    private static final String TAG = GTaskManager.class.getSimpleName();
+
+    // 同步成功状态码
+    public static final int STATE_SUCCESS = 0;
+    // 网络错误状态码
+    public static final int STATE_NETWORK_ERROR = 1;
+    // 内部错误状态码
+    public static final int STATE_INTERNAL_ERROR = 2;
+    // 同步正在进行状态码
+    public static final int STATE_SYNC_IN_PROGRESS = 3;
+    // 同步已取消状态码
+    public static final int STATE_SYNC_CANCELLED = 4;
+
+    private static GTaskManager mInstance = null;
+
+    // 关联的Activity，用于获取认证令牌等操作
+    private Activity mActivity;
+    // 上下文对象
+    private Context mContext;
+    // 内容解析器，用于操作内容提供器相关数据
+    private ContentResolver mContentResolver;
+    // 标记是否正在同步
+    private boolean mSyncing;
+    // 标记同步是否已取消
+    private boolean mCancelled;
+    // 存储Google Task列表的哈希表，以任务列表的GID为键，对应的TaskList对象为值
+    private HashMap<String, TaskList> mGTaskListHashMap;
+    // 存储Google Task节点的哈希表，以任务的GID为键，对应的Node对象为值
+    private HashMap<String, Node> mGTaskHashMap;
+    // 存储元数据的哈希表，以相关GID为键，对应的MetaData对象为值
+    private HashMap<String, MetaData> mMetaHashMap;
+    // 元数据列表对象
+    private TaskList mMetaList;
+    // 存储本地要删除的记录的ID集合
+    private HashSet<Long> mLocalDeleteIdMap;
+    // 存储Google任务的GID到本地记录ID的映射关系
+    private HashMap<String, Long> mGidToNid;
+    // 存储本地记录ID到Google任务的GID的映射关系
+    private HashMap<Long, String> mNidToGid;
+
+    // 私有构造函数，用于初始化相关成员变量
+    private GTaskManager() {
+        mSyncing = false;
+        mCancelled = false;
+        mGTaskListHashMap = new HashMap<String, TaskList>();
+        mGTaskHashMap = new HashMap<String, Node>();
+        mMetaHashMap = new HashMap<String, MetaData>();
+        mMetaList = null;
+        mLocalDeleteIdMap = new HashSet<Long>();
+        mGidToNid = new HashMap<String, Long>();
+        mNidToGid = new HashMap<Long, String>();
+    }
+
+    // 获取GTaskManager的单例实例
+    public static synchronized GTaskManager getInstance() {
+        if (mInstance == null) {
+            mInstance = new GTaskManager();
+        }
+        return mInstance;
+    }
+
+    // 设置关联的Activity上下文，主要用于获取认证令牌等操作
+    public synchronized void setActivityContext(Activity activity) {
+        // used for getting authtoken
+        mActivity = activity;
+    }
+
+    // 执行同步操作的核心方法，根据不同情况进行与Google Task的同步流程
+    public int sync(Context context, GTaskASyncTask asyncTask) {
+        if (mSyncing) {
+            Log.d(TAG, "Sync is in progress");
+            return STATE_SYNC_IN_PROGRESS;
+        }
+        mContext = context;
+        mContentResolver = mContext.getContentResolver();
+        mSyncing = true;
+        mCancelled = false;
+        // 清除之前同步相关的数据缓存
+        mGTaskListHashMap.clear();
+        mGTaskHashMap.clear();
+        mMetaHashMap.clear();
+        mLocalDeleteIdMap.clear();
+        mGidToNid.clear();
+        mNidToGid.clear();
+
+        try {
+            GTaskClient client = GTaskClient.getInstance();
+            client.resetUpdateArray();
+
+            // 登录Google Task，如果取消则不执行登录操作，登录失败抛出网络异常
+            if (!mCancelled) {
+                if (!client.login(mActivity)) {
+                    throw new NetworkFailureException("login google task failed");
+                }
+            }
+
+            // 发布初始化任务列表的进度提示
+            asyncTask.publishProgess(mContext.getString(R.string.sync_progress_init_list));
+            initGTaskList();
+
+            // 发布正在同步内容的进度提示
+            asyncTask.publishProgess(mContext.getString(R.string.sync_progress_syncing));
+            syncContent();
+        } catch (NetworkFailureException e) {
+            Log.e(TAG, e.toString());
+            return STATE_NETWORK_ERROR;
+        } catch (ActionFailureException e) {
+            Log.e(TAG, e.toString());
+            return STATE_INTERNAL_ERROR;
+        } catch (Exception e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            return STATE_INTERNAL_ERROR;
+        } finally {
+            // 无论如何，最终都要清除同步相关的数据缓存，并重置同步状态
+            mGTaskListHashMap.clear();
+            mGTaskHashMap.clear();
+            mMetaHashMap.clear();
+            mLocalDeleteIdMap.clear();
+            mGidToNid.clear();
+            mNidToGid.clear();
+            mSyncing = false;
+        }
+
+        return mCancelled? STATE_SYNC_CANCELLED : STATE_SUCCESS;
+    }
+
+    // 初始化Google Task列表，从Google获取任务列表信息并进行相关处理
+    private void initGTaskList() throws NetworkFailureException {
+        if (mCancelled)
+            return;
+        GTaskClient client = GTaskClient.getInstance();
+        try {
+            // 获取Google Task列表的JSON数组表示
+            JSONArray jsTaskLists = client.getTaskLists();
+
+            // 先初始化元数据列表，查找特定名称的元数据列表
+            mMetaList = null;
+            for (int i = 0; i < jsTaskLists.length(); i++) {
+                JSONObject object = jsTaskLists.getJSONObject(i);
+                String gid = object.getString(GTaskStringUtils.GTASK_JSON_ID);
+                String name = object.getString(GTaskStringUtils.GTASK_JSON_NAME);
+
+                if (name.equals(GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_META)) {
+                    mMetaList = new TaskList();
+                    mMetaList.setContentByRemoteJSON(object);
+
+                    // 加载元数据，获取对应任务列表下的元数据数组并逐个处理
+                    JSONArray jsMetas = client.getTaskList(gid);
+                    for (int j = 0; j < jsMetas.length(); j++) {
+                        object = (JSONObject) jsMetas.getJSONObject(j);
+                        MetaData metaData = new MetaData();
+                        metaData.setContentByRemoteJSON(object);
+                        if (metaData.isWorthSaving()) {
+                            mMetaList.addChildTask(metaData);
+                            if (metaData.getGid()!= null) {
+                                mMetaHashMap.put(metaData.getRelatedGid(), metaData);
+                            }
+                        }
+                    }
+                }
+            }
+
+            // 如果元数据列表不存在，则创建一个新的元数据列表并上传到Google
+            if (mMetaList == null) {
+                mMetaList = new TaskList();
+                mMetaList.setName(GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_META);
+                GTaskClient.getInstance().createTaskList(mMetaList);
+            }
+
+            // 初始化常规任务列表，遍历任务列表数组，创建并填充TaskList对象以及其包含的Task对象
+            for (int i = 0; i < jsTaskLists.length(); i++) {
+                JSONObject object = jsTaskLists.getJSONObject(i);
+                String gid = object.getString(GTaskStringUtils.GTASK_JSON_ID);
+                String name = object.getString(GTaskStringUtils.GTASK_JSON_NAME);
+
+                if (name.startsWith(GTaskStringUtils.MIUI_FOLDER_PREFFIX) &&
+                       !name.equals(GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_META)) {
+                    TaskList tasklist = new TaskList();
+                    tasklist.setContentByRemoteJSON(object);
+                    mGTaskListHashMap.put(gid, tasklist);
+                    mGTaskHashMap.put(gid, tasklist);
+
+                    // 加载任务，获取对应任务列表下的任务数组并逐个处理
+                    JSONArray jsTasks = client.getTaskList(gid);
+                    for (int j = 0; j < jsTasks.length(); j++) {
+                        object = (JSONObject) jsTasks.getJSONObject(j);
+                        gid = object.getString(GTaskStringUtils.GTASK_JSON_ID);
+                        Task task = new Task();
+                        task.setContentByRemoteJSON(object);
+                        if (task.isWorthSaving()) {
+                            task.setMetaInfo(mMetaHashMap.get(gid));
+                            tasklist.addChildTask(task);
+                            mGTaskHashMap.put(gid, task);
+                        }
+                    }
+                }
+            }
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("initGTaskList: handing JSONObject failed");
+        }
+    }
+
+    // 同步内容的主要方法，协调本地和远程数据的同步操作
+    private void syncContent() throws NetworkFailureException {
+        int syncType;
+        Cursor c = null;
+        String gid;
+        Node node;
+
+        mLocalDeleteIdMap.clear();
+
+        if (mCancelled) {
+            return;
+        }
+
+        // 处理本地已删除的笔记，查询本地已删除笔记并与远程数据对比进行相应同步操作
+        try {
+            c = mContentResolver.query(Notes.CONTENT_NOTE_URI, SqlNote.PROJECTION_NOTE,
+                    "(type<>? AND parent_id=?)", new String[] {
+                            String.valueOf(Notes.TYPE_SYSTEM), String.valueOf(Notes.ID_TRASH_FOLER)
+                    }, null);
+            if (c!= null) {
+                while (c.moveToNext()) {
+                    gid = c.getString(SqlNote.GTASK_ID_COLUMN);
+                    node = mGTaskHashMap.get(gid);
+                    if (node!= null) {
+                        mGTaskHashMap.remove(gid);
+                        doContentSync(Node.SYNC_ACTION_DEL_REMOTE, node, c);
+                    }
+
+                    mLocalDeleteIdMap.add(c.getLong(SqlNote.ID_COLUMN));
+                }
+            } else {
+                Log.w(TAG, "failed to query trash folder");
+            }
+        } finally {
+            if (c!= null) {
+                c.close();
+                c = null;
+            }
+        }
+
+        // 同步文件夹相关数据
+        syncFolder();
+
+        // 处理数据库中已存在的笔记，查询并根据情况确定同步类型，然后执行相应同步操作
+        try {
+            c = mContentResolver.query(Notes.CONTENT_NOTE_URI, SqlNote.PROJECTION_NOTE,
+                    "(type=? AND parent_id<>?)", new String[] {
+                            String.valueOf(Notes.TYPE_NOTE), String.valueOf(Notes.ID_TRASH_FOLER)
+                    }, NoteColumns.TYPE + " DESC");
+            if (c!= null) {
+                while (c.moveToNext()) {
+                    gid = c.getString(SqlNote.GTASK_ID_COLUMN);
+                    node = mGTaskHashMap.get(gid);
+                    if (node!= null) {
+                        mGTaskHashMap.remove(gid);
+                        mGidToNid.put(gid, c.getLong(SqlNote.ID_COLUMN));
+                        mNidToGid.put(c.getLong(SqlNote.ID_COLUMN), gid);
+                        syncType = node.getSyncAction(c);
+                    } else {
+                        if (c.getString(SqlNote.GTASK_ID_COLUMN).trim().length() == 0) {
+                            // 本地新增情况
+                            syncType = Node.SYNC_ACTION_ADD_REMOTE;
+                        } else {
+                            // 远程删除情况
+                            syncType = Node.SYNC_ACTION_DEL_LOCAL;
+                        }
+                    }
+                    doContentSync(syncType, node, c);
+                }
+            } else {
+                Log.w(TAG, "failed to query existing note in database");
+            }
+
+        } finally {
+            if (c!= null) {
+                c.close();
+                c = null;
+            }
+        }
+
+        // 处理剩余的未处理的任务，进行添加本地任务的同步操作
+        Iterator<Map.Entry<String, Node>> iter = mGTaskHashMap.entrySet().iterator();
+        while (iter.hasNext()) {
+            Map.Entry<String, Node> entry = iter.next();
+            node = entry.getValue();
+            doContentSync(Node.SYNC_ACTION_ADD_LOCAL, node, null);
+        }
+
+        // 如果未取消同步，清除本地已删除的记录
+        // mCancelled可以被其他线程设置，所以需要逐个检查
+        if (!mCancelled) {
+            if (!DataUtils.batchDeleteNotes(mContentResolver, mLocalDeleteIdMap)) {
+                throw new ActionFailureException("failed to batch-delete local deleted notes");
+            }
+        }
+
+        // 如果未取消同步，提交更新并刷新本地同步ID
+        if (!mCancelled) {
+            GTaskClient.getInstance().commitUpdate();
+            refreshLocalSyncId();
+        }
+
+    }
+
+    // 同步文件夹的具体操作方法，处理不同类型文件夹（根文件夹、通话记录文件夹、本地现有文件夹、远程新增文件夹等）的同步
+    private void syncFolder() throws NetworkFailureException {
+        Cursor c = null;
+        String gid;
+        Node node;
+        int syncType;
+
+        if (mCancelled) {
+            return;
+        }
+
+        // 处理根文件夹的同步操作，查询根文件夹并根据情况进行相应同步操作
+        try {
+            c = mContentResolver.query(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI,
+                    Notes.ID_ROOT_FOLDER), SqlNote.PROJECTION_NOTE, null, null, null);
+            if (c!= null) {
+                c.moveToNext();
+                gid = c.getString(SqlNote.GTASK_ID_COLUMN);
+                node = mGTaskHashMap.get(gid);
+                if (node!= null) {
+                    mGTaskHashMap.remove(gid);
+                    mGidToNid.put(gid, (long) Notes.ID_ROOT_FOLDER);
+                    mNidToGid.put((long) Notes.ID_ROOT_FOLDER, gid);
+                    // 对于系统文件夹，仅在必要时更新远程名称
+                    if (!node.getName().equals(
+                            GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_DEFAULT))
+                        doContentSync(Node.SYNC_ACTION_UPDATE_REMOTE, node, c);
+                } else {
+                    doContentSync(Node.SYNC_ACTION_ADD_REMOTE, node, c);
+                }
+            } else {
+                Log.w(TAG, "failed to query root folder");
+            }
+        } finally {
+            if (c!= null) {
+                c.close();
+                c = null;
+            }
+        }
+
+        // 处理通话记录文件夹的同步操作，查询通话记录文件夹并根据情况进行相应同步操作
+        try {
+            c = mContentResolver.query(Notes.CONTENT_NOTE_URI, SqlNote.PROJECTION_NOTE, "(_id=?)",
+                    new String[] {
+                        String.valueOf(Notes.ID_CALL_RECORD_FOLDER)
+                    }, null);
+            if (c!= null) {
+                if (c.moveToNext()) {
+                    gid = c.getString(SqlNote.GTASK_ID_COLUMN);
+                    node = mGTaskHashMap.get(gid);
+                    if (node!= null) {
+                        mGTaskHashMap.remove(gid);
+                        mGidToNid.put(gid, (long) Notes.ID_CALL_RECORD_FOLDER);
+                        mNidToGid.put((long) Notes.ID_CALL_RECORD        }
+            } else {
+                Log.w(TAG, "failed to query call note folder");
+            }
+        } finally {
+            if (c!= null) {
+                c.close();
+                c = null;
+            }
+        }
+
+        // 处理本地现有文件夹的同步操作，查询本地现有文件夹并根据情况确定同步类型，然后执行相应同步操作
+        try {
+            c = mContentResolver.query(Notes.CONTENT_NOTE_URI, SqlNote.PROJECTION_NOTE,
+                    "(type=? AND parent_id<>?)", new String[] {
+                            String.valueOf(Notes.TYPE_FOLDER), String.valueOf(Notes.ID_TRASH_FOLER)
+                    }, NoteColumns.TYPE + " DESC");
+            if (c!= null) {
+                while (c.moveToNext()) {
+                    gid = c.getString(SqlNote.GTASK_ID_COLUMN);
+                    node = mGTaskHashMap.get(gid);
+                    if (node!= null) {
+                        mGTaskHashMap.remove(gid);
+                        mGidToNid.put(gid, c.getLong(SqlNote.ID_COLUMN));
+                        mNidToGid.put(c.getLong(SqlNote.ID_COLUMN), gid);
+                        syncType = node.getSyncAction(c);
+                    } else {
+                        if (c.getString(SqlNote.GTASK_ID_COLUMN).trim().length() == 0) {
+                            // 本地添加情况
+                            syncType = Node.SYNC_ACTION_ADD_REMOTE;
+                        } else {
+                            // 远程删除情况
+                            syncType = Node.SYNC_ACTION_DEL_LOCAL;
+                        }
+                    }
+                    doContentSync(syncType, node, c);
+                }
+            } else {
+                Log.w(TAG, "failed to query existing folder");
+            }
+        } finally {
+            if (c!= null) {
+                c.close();
+                c = null;
+            }
+        }
+
+        // 处理远程添加的文件夹，遍历远程任务列表哈希表，进行相应添加本地任务的同步操作
+        Iterator<Map.Entry<String, TaskList>> iter = mGTaskListHashMap.entrySet().iterator();
+        while (iter.hasNext()) {
+            Map.Entry<String, TaskList> entry = iter.next();
+            gid = entry.getKey();
+            node = entry.getValue();
+            if (mGTaskHashMap.containsKey(gid)) {
+                mGTaskHashMap.remove(gid);
+                doContentSync(Node.SYNC_ACTION_ADD_LOCAL, node, null);
+            }
+        }
+
+        if (!mCancelled)
+            GTaskClient.getInstance().commitUpdate();
+    }
+
+    // 根据不同的同步类型执行具体的内容同步操作，如添加本地节点、添加远程节点、删除本地节点、删除远程节点等
+    private void doContentSync(int syncType, Node node, Cursor c) throws NetworkFailureException {
+        if (mCancelled) {
+            return;
+        }
+
+        MetaData meta;
+        switch (syncType) {
+            case Node.SYNC_ACTION_ADD_LOCAL:
+                addLocalNode(node);
+                break;
+            case Node.SYNC_ACTION_ADD_REMOTE:
+                addRemoteNode(node, c);
+                break;
+            case Node.SYNC_ACTION_DEL_LOCAL:
+                meta = mMetaHashMap.get(c.getString(SqlNote.GTASK_ID_COLUMN));
+                if (meta!= null) {
+                    GTaskClient.getInstance().deleteNode(meta);
+                }
+                mLocalDeleteIdMap.add(c.getLong(SqlNote.ID_COLUMN));
+                break;
+            case Node.SYNC_ACTION_DEL_REMOTE:
+                meta = mMetaHashMap.get(node.getGid());
+                if (meta!= null) {
+                    GTaskClient.getInstance().deleteNode(meta);
+                }
+                GTaskClient.getInstance().deleteNode(node);
+                break;
+            case Node.SYNC_ACTION_UPDATE_LOCAL:
+                updateLocalNode(node, c);
+                break;
+            case Node.SYNC_ACTION_UPDATE_REMOTE:
+                updateRemoteNode(node, c);
+                break;
+            case Node.SYNC_ACTION_UPDATE_CONFLICT:
+                // 合并双方修改可能是个好主意，目前简单使用本地更新
+                updateRemoteNode(node, c);
+                break;
+            case Node.SYNC_ACTION_NONE:
+                break;
+            case Node.SYNC_ACTION_ERROR:
+            default:
+                throw new ActionFailureException("unkown sync action type");
+        }
+    }
+
+    // 添加本地节点的操作方法，根据节点类型（任务列表或普通任务）创建对应的本地记录并进行相关设置和更新
+    private void addLocalNode(Node node) throws NetworkFailureException {
+        if (mCancelled) {
+            return;
+        }
+
+        SqlNote sqlNote;
+        if (node instanceof TaskList) {
+            if (node.getName().equals(
+                    GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_DEFAULT)) {
+                sqlNote = new SqlNote(mContext, Notes.ID_ROOT_FOLDER);
+            } else if (node.getName().equals(
+                    GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_CALL_NOTE)) {
+                sqlNote = new SqlNote(mContext, Notes.ID_CALL_RECORD_FOLDER);
+            } else {
+                sqlNote = new SqlNote(mContext);
+                sqlNote.setContent(node.getLocalJSONFromContent());
+                sqlNote.setParentId(Notes.ID_ROOT_FOLDER);
+            }
+        } else {
+            sqlNote = new SqlNote(mContext);
+            JSONObject js = node.getLocalJSONFromContent();
+            try {
+                if (js.has(GTaskStringUtils.META_HEAD_NOTE)) {
+                    JSONObject note = js.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
+                    if (note.has(NoteColumns.ID)) {
+                        long id = note.getLong(NoteColumns.ID);
+                        if (DataUtils.existInNoteDatabase(mContentResolver, id)) {
+                            // 如果ID已存在，需要创建一个新的，移除原来的ID
+                            note.remove(NoteColumns.ID);
+                        }
+                    }
+                }
+
+                if (js.has(GTaskStringUtils.META_HEAD_DATA)) {
+                    JSONArray dataArray = js.getJSONArray(GTaskStringUtils.META_HEAD_DATA);
+                    for (int i = 0; i < dataArray.length(); i++) {
+                        JSONObject data = dataArray.getJSONObject(i);
+                        if (data.has(DataColumns.ID)) {
+                            long dataId = data.getLong(DataColumns.ID);
+                            if (DataUtils.existInDataDatabase(mContentResolver, dataId)) {
+                                // 如果数据ID已存在，需要创建一个新的，移除原来的ID
+                                data.remove(DataColumns.ID);
+                            }
+                        }
+                    }
+
+                }
+            } catch (JSONException e) {
+                Log.w(TAG, e.toString());
+                e.printStackTrace();
+            }
+            sqlNote.setContent(js);
+
+            Long parentId = mGidToNid.get(((Task) node).getParent().getGid());
+            if (parentId == null) {
+                Log.e(TAG, "cannot find task's parent id locally");
+                throw new ActionFailureException("cannot add local node");
+            }
+            sqlNote.setParentId(parentId.longValue());
+        }
+
+        // 创建本地节点，提交到本地数据库（不触发本地修改检查）
+        sqlNote.setGtaskId(node.getGid());
+        sqlNote.commit(false);
+
+        // 更新GID和本地记录ID的映射关系
+        mGidToNid.put(node.getGid(), sqlNote.getId());
+        mNidToGid.put(sqlNote.getId(), node.getGid());
+
+        // 更新远程元数据相关信息
+        updateRemoteMeta(node.getGid(), sqlNote);
+    }
+
+    // 更新本地节点的操作方法，更新本地记录的内容、父节点等信息，并更新远程元数据相关信息
+    private void updateLocalNode(Node node, Cursor c) throws NetworkFailureException {
+        if (mCancelled) {
+            return;
+        }
+
+        SqlNote sqlNote;
+        // 根据传入的游标更新本地记录内容
+        sqlNote = new SqlNote(mContext, c);
+        sqlNote.setContent(node.getLocalJSONFromContent());
+
+        Long parentId = (node instanceof Task)? mGidToNid.get(((Task) node).getParent().getGid())
+                : new Long(Notes.ID_ROOT_FOLDER);
+        if (parentId == null) {
+            Log.e(TAG, "cannot find task's parent id locally");
+            throw new ActionFailureException("cannot update local node");
+        }
+        sqlNote.setParentId(parentId.longValue());
+        sqlNote.commit(true);
+
+        // 更新远程元数据相关信息
+        updateRemoteMeta(node.getGid(), sqlNote);
+    }
+
+    // 添加远程节点的操作方法，根据节点类型（任务或任务列表）在远程进行相应创建操作，并更新本地记录相关信息和映射关系
+    private void addRemoteNode(Node node, Cursor c) throws NetworkFailureException {
+        if (mCancelled) {
+            return;
+        }
+
+        SqlNote sqlNote = new SqlNote(mContext, c);
+        Node n;
+
+        // 根据节点类型进行不同的远程更新操作
+        if (sqlNote.isNoteType()) {
+            Task task = new Task();
+            task.setContentByLocalJSON(sqlNote.getContent());
+
+            String parentGid = mNidToGid.get(sqlNote.getParentId());
+            if (parentGid == null) {
+                Log.e(TAG, "cannot find task's parent tasklist");
+                throw new ActionFailureException("cannot add remote task");
+            }
+            mGTaskListHashMap.get(parentGid).addChildTask(task);
+
+            GTaskClient.getInstance().createTask(task);
+            n = (Node) task;
+
+            // 添加元数据相关更新
+            updateRemoteMeta(task.getGid(), sqlNote);
+        } else {
+            TaskList tasklist = null;
+
+            // 根据不同的本地记录ID确定文件夹名称，查找是否已存在同名文件夹
+            String folderName = GTaskStringUtils.MIUI_FOLDER_PREFFIX;
+            if (sqlNote.getId() == Notes.ID_ROOT_FOLDER)
+                folderName += GTaskStringUtils.FOLDER_DEFAULT;
+            else if (sqlNote.getId() == Notes.ID_CALL_RECORD_FOLDER)
+                folderName += GTaskStringUtils.FOLDER_CALL_NOTE;
+            else
+                folderName += sqlNote.getSnippet();
+
+            Iterator<Map.Entry<String, TaskList>> iter = mGTaskListHashMap.entrySet().iterator();
+            while (iter.hasNext()) {
+                Map.Entry<String, TaskList> entry = iter.next();
+                String gid = entry.getKey();
+                TaskList list = entry.getValue();
+
+                if (list.getName().equals(folderName)) {
+                    tasklist = list;
+                    if (mGTaskHashMap.containsKey(gid)) {
+                        mGTaskHashMap.remove(gid);
+                    }
+                    break;
+                }
+            }
+
+            // 如果没有找到同名文件夹，则创建新的任务列表并上传到远程
+            if (tasklist == null) {
+                tasklist = new TaskList();
+                tasklist.setContentByLocalJSON(sqlNote.getContent());
+                GTaskClient.getInstance().createTaskList(tasklist);
+                mGTaskListHashMap.put(tasklist.getGid(), tasklist);
+            }
+            n = (Node) tasklist;
+        }
+
+        // 更新本地记录的GID等信息，并提交到本地数据库（先提交不触发本地修改检查，再提交触发检查）
+        sqlNote.setGtaskId(n.getGid());
+        sqlNote.commit(false);
+        sqlNote.resetLocalModified();
+        sqlNote.commit(true);
+
+        // 更新GID和本地记录ID的映射关系
+        mGidToNid.put(n.getGid(), sqlNote.getId());
+        mNidToGid.put(sqlNote.getId(), n.getGid());
+    }
+
+    // 更新远程节点的操作方法，更新远程节点内容、移动任务（如果需要）、清除本地修改标记等操作，并更新远程元数据相关信息
+    private void updateRemoteNode(Node node, Cursor c) throws NetworkFailureException {
+        if (mCancelled) {
+            return;
+        }
+
+        SqlNote sqlNote = new SqlNote(mContext, c);
+
+        // 更新远程节点内容
+        node.setContentByLocalJSON(sqlNote.getContent());
+        GTaskClient.getInstance().addUpdateNode(node);
+
+        // 更新远程元数据相关信息
+        updateRemoteMeta(node.getGid(), sqlNote);
+
+        // 如果是任务类型，检查是否需要移动任务到不同的任务列表
+        if (sqlNote.isNoteType()) {
+            Task task = (Task) node;
+            TaskList preParentList = task.getParent();
+
+            String curParentGid = mNidToGid.get(sqlNote.getParentId());
+            if (curParentGid == null) {
+                Log.e(TAG, "cannot find task's parent tasklist");
+                throw new ActionFailureException("cannot update remote task");
+            }
+            TaskList curParentList = mGTaskListHashMap.get(curParentGid);
+
+            if (preParentList!= curParentList) {
+                preParentList.removeChildTask(task);
+                curParentList.addChildTask(task);
+                GTaskClient.getInstance().moveTask(task, preParentList, curParentList);
+            }
+        }
+
+        // 清除本地修改标记并提交到本地数据库
+        sqlNote.resetLocalModified();
+        sqlNote.commit(true);
+    }
+
+    // 更新远程元数据的操作方法，根据情况更新已存在的元数据或者创建新的元数据并上传到远程
+    private void updateRemoteMeta(String gid, SqlNote sqlNote) throws NetworkFailureException {
+        if (sqlNote!= null && sqlNote.isNoteType()) {
+            MetaData metaData = mMetaHashMap.get(gid);
+            if (metaData!= null) {
+                metaData.setMeta(gid, sqlNote.getContent());
+                GTaskClient.getInstance().addUpdateNode(metaData);
+            } else {
+                metaData = new MetaData();
+                metaData.setMeta(gid, sqlNote.getContent());
+                mMetaList.addChildTask(metaData);
+                mMetaHashMap.put(gid, metaData);
+                GTaskClient.getInstance().createTask(metaData);
+            }
+        }
+    }
+
+    // 刷新本地同步ID的方法，重新获取最新的Google Task列表信息，然后更新本地记录的同步ID
+    private void refreshLocalSyncId() throws NetworkFailureException {
+        if (mCancelled) {
+            return;
+        }
+
+        // 获取最新的Google Task列表相关数据，清除之前缓存
+        mGTaskHashMap.clear();
+        mGTaskListHashMap.clear();
+        mMetaHashMap.clear();
+        initGTaskList();
+
+        Cursor c = null;
+        try {
+            c = mContentResolver.query(Notes.CONTENT_NOTE_URI, SqlNote.PROJECTION_NOTE,
+                    "(type<>? AND parent_id<>?)", new String[] {
+                            String.valueOf(Notes.TYPE_SYSTEM), String.valueOf(Notes.ID_TRASH_FOLER)
+                    }, NoteColumns.TYPE + " DESC");
+            if (c!= null) {
+                while (c.moveToNext()) {
+                    String gid = c.getString(SqlNote.GTASK_ID_COLUMN);
+                    Node node = mGTaskHashMap.get(gid);
+                    if (node!= null) {
+                        mGTaskHashMap.remove(gid);
+                        ContentValues values = new ContentValues();
+                        values.put(NoteColumns.SYNC_ID, node.getLastModified());
+                        mContentResolver.update(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI,
+                                c.getLong(SqlNote.ID_COLUMN)), values, null, null);
+                    } else {
+                        Log.e(TAG, "something is missed");
+                        throw new ActionFailureException(
+                                "some local items don't have gid after sync");
+                    }
+                }
+            } else {
+                Log.w(TAG, "failed to query local note to refresh sync id");
+            }
+        } finally {
+            if (c!= null) {
+                c.close();
+                c = null;
+            }
+        }
+    }
+
+    // 获取同步账户名称的方法
+    public String getSyncAccount() {
+        return GTaskClient.getInstance().getSyncAccount().name;
+    }
+
+    // 取消同步的方法，设置同步已取消的标记
+    public void cancelSync() {
+        mCancelled = true;
+    }
+}

src/GTaskStringUtils.java

@@ -0,0 +1,76 @@
+/*
+ * 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 {
+
+    // GTASK JSON 数据字段常量
+    public final static String GTASK_JSON_ACTION_ID = "action_id";  // 操作ID
+    public final static String GTASK_JSON_ACTION_LIST = "action_list";  // 操作列表
+    public final static String GTASK_JSON_ACTION_TYPE = "action_type";  // 操作类型
+    public final static String GTASK_JSON_ACTION_TYPE_CREATE = "create";  // 创建操作
+    public final static String GTASK_JSON_ACTION_TYPE_GETALL = "get_all";  // 获取所有操作
+    public final static String GTASK_JSON_ACTION_TYPE_MOVE = "move";  // 移动操作
+    public final static String GTASK_JSON_ACTION_TYPE_UPDATE = "update";  // 更新操作
+    public final static String GTASK_JSON_CREATOR_ID = "creator_id";  // 创建者ID
+    public final static String GTASK_JSON_CHILD_ENTITY = "child_entity";  // 子实体
+    public final static String GTASK_JSON_CLIENT_VERSION = "client_version";  // 客户端版本
+    public final static String GTASK_JSON_COMPLETED = "completed";  // 是否完成
+    public final static String GTASK_JSON_CURRENT_LIST_ID = "current_list_id";  // 当前列表ID
+    public final static String GTASK_JSON_DEFAULT_LIST_ID = "default_list_id";  // 默认列表ID
+    public final static String GTASK_JSON_DELETED = "deleted";  // 是否删除
+    public final static String GTASK_JSON_DEST_LIST = "dest_list";  // 目标列表
+    public final static String GTASK_JSON_DEST_PARENT = "dest_parent";  // 目标父级
+    public final static String GTASK_JSON_DEST_PARENT_TYPE = "dest_parent_type";  // 目标父级类型
+    public final static String GTASK_JSON_ENTITY_DELTA = "entity_delta";  // 实体差异
+    public final static String GTASK_JSON_ENTITY_TYPE = "entity_type";  // 实体类型
+    public final static String GTASK_JSON_GET_DELETED = "get_deleted";  // 获取已删除的
+    public final static String GTASK_JSON_ID = "id";  // ID
+    public final static String GTASK_JSON_INDEX = "index";  // 索引
+    public final static String GTASK_JSON_LAST_MODIFIED = "last_modified";  // 最后修改时间
+    public final static String GTASK_JSON_LATEST_SYNC_POINT = "latest_sync_point";  // 最新同步点
+    public final static String GTASK_JSON_LIST_ID = "list_id";  // 列表ID
+    public final static String GTASK_JSON_LISTS = "lists";  // 列表
+    public final static String GTASK_JSON_NAME = "name";  // 名称
+    public final static String GTASK_JSON_NEW_ID = "new_id";  // 新ID
+    public final static String GTASK_JSON_NOTES = "notes";  // 笔记
+    public final static String GTASK_JSON_PARENT_ID = "parent_id";  // 父级ID
+    public final static String GTASK_JSON_PRIOR_SIBLING_ID = "prior_sibling_id";  // 上一个兄弟ID
+    public final static String GTASK_JSON_RESULTS = "results";  // 结果
+    public final static String GTASK_JSON_SOURCE_LIST = "source_list";  // 源列表
+    public final static String GTASK_JSON_TASKS = "tasks";  // 任务
+    public final static String GTASK_JSON_TYPE = "type";  // 类型
+    public final static String GTASK_JSON_TYPE_GROUP = "GROUP";  // 任务组类型
+    public final static String GTASK_JSON_TYPE_TASK = "TASK";  // 任务类型
+    public final static String GTASK_JSON_USER = "user";  // 用户
+
+    // MIUI 笔记相关文件夹前缀
+    public final static String MIUI_FOLDER_PREFFIX = "[MIUI_Notes]";  // MIUI笔记文件夹前缀
+
+    // 默认文件夹名称
+    public final static String FOLDER_DEFAULT = "Default";  // 默认文件夹
+    public final static String FOLDER_CALL_NOTE = "Call_Note";  // 通话笔记文件夹
+    public final static String FOLDER_META = "METADATA";  // 元数据文件夹
+
+    // 元数据头部字段
+    public final static String META_HEAD_GTASK_ID = "meta_gid";  // GTASK ID
+    public final static String META_HEAD_NOTE = "meta_note";  // 笔记元数据
+    public final static String META_HEAD_DATA = "meta_data";  // 数据元数据
+
+    // 元数据笔记名称，表示不允许更新和删除
+    public final static String META_NOTE_NAME = "[META INFO] DON'T UPDATE AND DELETE";  // 元数据笔记名称
+}

src/GTaskSyncService.java

@@ -0,0 +1,198 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.gtask.remote;
+
+import android.app.Activity;
+import android.app.Service;
+import android.content.Context;
+import android.content.Intent;
+import android.os.Bundle;
+import android.os.IBinder;
+
+/**
+ * GTaskSyncService 是一个后台服务，用于管理Google任务（GTask）的同步操作。
+ * 它提供启动和取消同步的方法，并在同步过程中广播进度更新。
+ */
+public class GTaskSyncService extends Service {
+
+    /**
+     * 表示同步动作类型的字符串常量名。
+     */
+    public final static String ACTION_STRING_NAME = "sync_action_type";
+
+    /**
+     * 同步开始的动作代码。
+     */
+    public final static int ACTION_START_SYNC = 0;
+
+    /**
+     * 取消同步的动作代码。
+     */
+    public final static int ACTION_CANCEL_SYNC = 1;
+
+    /**
+     * 无效或未定义的动作代码。
+     */
+    public final static int ACTION_INVALID = 2;
+
+    /**
+     * 广播名称，用于发送同步状态和服务消息。
+     */
+    public final static String GTASK_SERVICE_BROADCAST_NAME = "net.micode.notes.gtask.remote.gtask_sync_service";
+
+    /**
+     * 广播中表示是否正在进行同步的键名。
+     */
+    public final static String GTASK_SERVICE_BROADCAST_IS_SYNCING = "isSyncing";
+
+    /**
+     * 广播中表示同步进度信息的键名。
+     */
+    public final static String GTASK_SERVICE_BROADCAST_PROGRESS_MSG = "progressMsg";
+
+    /**
+     * 当前执行的同步任务实例。
+     */
+    private static GTaskASyncTask mSyncTask = null;
+
+    /**
+     * 当前同步任务的进度信息。
+     */
+    private static String mSyncProgress = "";
+
+    /**
+     * 开始同步操作。如果当前没有正在运行的同步任务，则创建并启动一个新的同步任务。
+     */
+    private void startSync() {
+        if (mSyncTask == null) {
+            mSyncTask = new GTaskASyncTask(this, new GTaskASyncTask.OnCompleteListener() {
+                @Override
+                public void onComplete() {
+                    mSyncTask = null;
+                    sendBroadcast("");
+                    stopSelf();
+                }
+            });
+            sendBroadcast("");
+            mSyncTask.execute();
+        }
+    }
+
+    /**
+     * 取消正在进行的同步操作。
+     */
+    private void cancelSync() {
+        if (mSyncTask != null) {
+            mSyncTask.cancelSync();
+        }
+    }
+
+    /**
+     * 当服务被创建时调用。
+     */
+    @Override
+    public void onCreate() {
+        super.onCreate();
+        mSyncTask = null;
+    }
+
+    /**
+     * 当服务接收到启动命令时调用。
+     */
+    @Override
+    public int onStartCommand(Intent intent, int flags, int startId) {
+        Bundle bundle = intent.getExtras();
+        if (bundle != null && bundle.containsKey(ACTION_STRING_NAME)) {
+            switch (bundle.getInt(ACTION_STRING_NAME, ACTION_INVALID)) {
+                case ACTION_START_SYNC:
+                    startSync();
+                    break;
+                case ACTION_CANCEL_SYNC:
+                    cancelSync();
+                    break;
+                default:
+                    // 忽略未知动作
+                    break;
+            }
+            return START_STICKY; // 如果进程被杀死，尝试重启服务
+        }
+        return super.onStartCommand(intent, flags, startId);
+    }
+
+    /**
+     * 当系统内存不足时调用，尝试释放资源。
+     */
+    @Override
+    public void onLowMemory() {
+        super.onLowMemory();
+        if (mSyncTask != null) {
+            mSyncTask.cancelSync();
+        }
+    }
+
+    /**
+     * 返回绑定到此服务的IBinder对象，本服务不支持绑定，所以返回null。
+     */
+    @Override
+    public IBinder onBind(Intent intent) {
+        return null;
+    }
+
+    /**
+     * 发送广播以通知其他组件当前同步的状态和进度。
+     */
+    public void sendBroadcast(String msg) {
+        mSyncProgress = msg;
+        Intent intent = new Intent(GTASK_SERVICE_BROADCAST_NAME);
+        intent.putExtra(GTASK_SERVICE_BROADCAST_IS_SYNCING, mSyncTask != null);
+        intent.putExtra(GTASK_SERVICE_BROADCAST_PROGRESS_MSG, msg);
+        sendBroadcast(intent);
+    }
+
+    /**
+     * 静态方法，从Activity启动同步服务。
+     */
+    public static void startSync(Activity activity) {
+        GTaskManager.getInstance().setActivityContext(activity);
+        Intent intent = new Intent(activity, GTaskSyncService.class);
+        intent.putExtra(ACTION_STRING_NAME, ACTION_START_SYNC);
+        activity.startService(intent);
+    }
+
+    /**
+     * 静态方法，通过上下文取消同步操作。
+     */
+    public static void cancelSync(Context context) {
+        Intent intent = new Intent(context, GTaskSyncService.class);
+        intent.putExtra(ACTION_STRING_NAME, ACTION_CANCEL_SYNC);
+        context.startService(intent);
+    }
+
+    /**
+     * 检查是否有同步任务正在进行。
+     */
+    public static boolean isSyncing() {
+        return mSyncTask != null;
+    }
+
+    /**
+     * 获取当前同步任务的进度信息。
+     */
+    public static String getProgressString() {
+        return mSyncProgress;
+    }
+}

src/NetworkFailureException.java

@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.gtask.exception;
+
+/**
+ * NetworkFailureException 类是用于表示网络操作失败时抛出的异常。
+ * 它继承自 Exception，因此它是一个检查型异常（checked exception），
+ * 这意味着在方法签名中需要声明此异常可能会被抛出，以确保调用者处理或重新抛出该异常。
+ */
+public class NetworkFailureException extends Exception {
+
+    // 序列化版本唯一标识符，用于确保类的不同版本之间的兼容性。
+    private static final long serialVersionUID = 2107610287180234136L;
+
+    /**
+     * 构造一个新的 NetworkFailureException，不带任何详细信息消息或原因。
+     */
+    public NetworkFailureException() {
+        super();
+    }
+
+    /**
+     * 使用指定的详细信息消息构造一个新的 NetworkFailureException。
+     * @param message 提供更多关于异常的信息的消息字符串。
+     */
+    public NetworkFailureException(String message) {
+        super(message);
+    }
+
+    /**
+     * 使用指定的详细信息消息和原因构造一个新的 NetworkFailureException。
+     * @param message 提供更多关于异常的信息的消息字符串。
+     * @param cause 导致当前异常的底层原因。
+     */
+    public NetworkFailureException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}

src/Node.java

@@ -0,0 +1,108 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.gtask.data;
+
+import android.database.Cursor;
+import org.json.JSONObject;
+
+/**
+ * Node类是一个抽象类，表示一个同步节点，包含了节点的基本属性和同步操作。
+ */
+public abstract class Node {
+    // 同步操作的常量定义
+    public static final int SYNC_ACTION_NONE = 0; // 无操作
+    public static final int SYNC_ACTION_ADD_REMOTE = 1; // 添加到远程
+    public static final int SYNC_ACTION_ADD_LOCAL = 2; // 添加到本地
+    public static final int SYNC_ACTION_DEL_REMOTE = 3; // 从远程删除
+    public static final int SYNC_ACTION_DEL_LOCAL = 4; // 从本地删除
+    public static final int SYNC_ACTION_UPDATE_REMOTE = 5; // 更新远程
+    public static final int SYNC_ACTION_UPDATE_LOCAL = 6; // 更新本地
+    public static final int SYNC_ACTION_UPDATE_CONFLICT = 7; // 更新冲突
+    public static final int SYNC_ACTION_ERROR = 8; // 错误
+
+    // 节点的基本属性
+    private String mGid; // 唯一标识符
+    private String mName; // 节点名称
+    private long mLastModified; // 上次修改时间
+    private boolean mDeleted; // 是否已删除
+
+    // 构造函数，初始化节点属性
+    public Node() {
+        mGid = null; // 初始化 Gid 为 null
+        mName = ""; // 初始化名称为空字符串
+        mLastModified = 0; // 初始化最后修改时间为 0
+        mDeleted = false; // 初始化删除状态为 false
+    }
+
+    // 抽象方法：获取创建操作的 JSON 对象
+    public abstract JSONObject getCreateAction(int actionId);
+
+    // 抽象方法：获取更新操作的 JSON 对象
+    public abstract JSONObject getUpdateAction(int actionId);
+
+    // 抽象方法：根据远程 JSON 设置内容
+    public abstract void setContentByRemoteJSON(JSONObject js);
+
+    // 抽象方法：根据本地 JSON 设置内容
+    public abstract void setContentByLocalJSON(JSONObject js);
+
+    // 抽象方法：从内容获取本地 JSON 对象
+    public abstract JSONObject getLocalJSONFromContent();
+
+    // 抽象方法：根据 Cursor 获取同步操作
+    public abstract int getSyncAction(Cursor c);
+
+    // 设置 Gid
+    public void setGid(String gid) {
+        this.mGid = gid;
+    }
+
+    // 设置名称
+    public void setName(String name) {
+        this.mName = name;
+    }
+
+    // 设置最后修改时间
+    public void setLastModified(long lastModified) {
+        this.mLastModified = lastModified;
+    }
+
+    // 设置删除状态
+    public void setDeleted(boolean deleted) {
+        this.mDeleted = deleted;
+    }
+
+    // 获取 Gid
+    public String getGid() {
+        return this.mGid;
+    }
+
+    // 获取名称
+    public String getName() {
+        return this.mName;
+    }
+
+    // 获取最后修改时间
+    public long getLastModified() {
+        return this.mLastModified;
+    }
+
+    // 获取删除状态
+    public boolean getDeleted() {
+        return this.mDeleted;
+    }
+}

src/Note.java

@@ -0,0 +1,265 @@
+/*
+ * 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;  // 用于存储笔记修改的数据
+    private NoteData mNoteData;  // 用于存储笔记的具体内容（如文本或通话数据）
+    private static final String TAG = "Note";  // 用于日志输出的标签
+    
+    /**
+     * 创建一个新的笔记ID，用于在数据库中添加新的笔记
+     */
+    public static synchronized long getNewNoteId(Context context, long folderId) {
+        // 创建新的笔记记录
+        ContentValues values = new ContentValues();
+        long createdTime = System.currentTimeMillis();
+        values.put(NoteColumns.CREATED_DATE, createdTime);  // 设置创建时间
+        values.put(NoteColumns.MODIFIED_DATE, createdTime);  // 设置修改时间
+        values.put(NoteColumns.TYPE, Notes.TYPE_NOTE);  // 设置笔记类型
+        values.put(NoteColumns.LOCAL_MODIFIED, 1);  // 设置为本地已修改
+        values.put(NoteColumns.PARENT_ID, folderId);  // 设置笔记所在的文件夹ID
+        
+        // 插入新笔记到数据库，并获取URI
+        Uri uri = context.getContentResolver().insert(Notes.CONTENT_NOTE_URI, values);
+
+        long noteId = 0;
+        try {
+            noteId = Long.valueOf(uri.getPathSegments().get(1));  // 获取新笔记的ID
+        } catch (NumberFormatException e) {
+            Log.e(TAG, "Get note id error :" + e.toString());
+            noteId = 0;
+        }
+        
+        // 如果ID获取失败，抛出异常
+        if (noteId == -1) {
+            throw new IllegalStateException("Wrong note id:" + noteId);
+        }
+        return noteId;  // 返回新创建的笔记ID
+    }
+
+    public Note() {
+        mNoteDiffValues = new ContentValues();  // 初始化笔记修改数据
+        mNoteData = new NoteData();  // 初始化笔记具体内容
+    }
+
+    // 设置笔记的某个键值对
+    public void setNoteValue(String key, String value) {
+        mNoteDiffValues.put(key, value);  // 将键值对放入修改数据中
+        mNoteDiffValues.put(NoteColumns.LOCAL_MODIFIED, 1);  // 标记本地已修改
+        mNoteDiffValues.put(NoteColumns.MODIFIED_DATE, System.currentTimeMillis());  // 更新修改时间
+    }
+
+    // 设置文本数据
+    public void setTextData(String key, String value) {
+        mNoteData.setTextData(key, value);  // 将文本数据传递给NoteData对象
+    }
+
+    // 设置文本数据ID
+    public void setTextDataId(long id) {
+        mNoteData.setTextDataId(id);  // 设置文本数据的ID
+    }
+
+    // 获取文本数据ID
+    public long getTextDataId() {
+        return mNoteData.mTextDataId;  // 返回文本数据的ID
+    }
+
+    // 设置通话数据ID
+    public void setCallDataId(long id) {
+        mNoteData.setCallDataId(id);  // 设置通话数据的ID
+    }
+
+    // 设置通话数据
+    public void setCallData(String key, String value) {
+        mNoteData.setCallData(key, value);  // 将通话数据传递给NoteData对象
+    }
+
+    // 判断笔记是否本地已修改
+    public boolean isLocalModified() {
+        return mNoteDiffValues.size() > 0 || mNoteData.isLocalModified();  // 如果修改数据不为空或者NoteData已修改，则返回true
+    }
+
+    // 同步笔记数据到ContentProvider
+    public boolean syncNote(Context context, long noteId) {
+        if (noteId <= 0) {
+            throw new IllegalArgumentException("Wrong note id:" + noteId);  // 检查笔记ID是否合法
+        }
+
+        if (!isLocalModified()) {
+            return true;  // 如果没有修改，直接返回
+        }
+
+        // 更新笔记的修改数据
+        if (context.getContentResolver().update(
+                ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), mNoteDiffValues, null,
+                null) == 0) {
+            Log.e(TAG, "Update note error, should not happen");
+        }
+        mNoteDiffValues.clear();  // 清空修改数据
+
+        // 如果有本地修改的内容，推送到ContentResolver
+        if (mNoteData.isLocalModified()
+                && (mNoteData.pushIntoContentResolver(context, noteId) == null)) {
+            return false;  // 如果推送失败，返回false
+        }
+
+        return true;  // 同步成功，返回true
+    }
+
+    // 内部类：表示笔记的具体内容（文本数据、通话数据）
+    private class NoteData {
+        private long mTextDataId;  // 文本数据的ID
+        private ContentValues mTextDataValues;  // 文本数据的内容
+        private long mCallDataId;  // 通话数据的ID
+        private ContentValues mCallDataValues;  // 通话数据的内容
+
+        private static final String TAG = "NoteData";  // 用于日志输出的标签
+
+        public NoteData() {
+            mTextDataValues = new ContentValues();  // 初始化文本数据
+            mCallDataValues = new ContentValues();  // 初始化通话数据
+            mTextDataId = 0;
+            mCallDataId = 0;
+        }
+
+        // 判断笔记内容是否本地已修改
+        boolean isLocalModified() {
+            return mTextDataValues.size() > 0 || mCallDataValues.size() > 0;  // 如果文本或通话数据有修改，返回true
+        }
+
+        // 设置文本数据的ID
+        void setTextDataId(long id) {
+            if(id <= 0) {
+                throw new IllegalArgumentException("Text data id should larger than 0");  // 检查ID是否合法
+            }
+            mTextDataId = id;  // 设置文本数据ID
+        }
+
+        // 设置通话数据的ID
+        void setCallDataId(long id) {
+            if (id <= 0) {
+                throw new IllegalArgumentException("Call data id should larger than 0");  // 检查ID是否合法
+            }
+            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);  // 将通话数据放入ContentValues
+            mNoteDiffValues.put(NoteColumns.LOCAL_MODIFIED, 1);  // 标记本地已修改
+            mNoteDiffValues.put(NoteColumns.MODIFIED_DATE, System.currentTimeMillis());  // 更新修改时间
+        }
+
+        // 设置文本数据
+        void setTextData(String key, String value) {
+            mTextDataValues.put(key, value);  // 将文本数据放入ContentValues
+            mNoteDiffValues.put(NoteColumns.LOCAL_MODIFIED, 1);  // 标记本地已修改
+            mNoteDiffValues.put(NoteColumns.MODIFIED_DATE, System.currentTimeMillis());  // 更新修改时间
+        }
+
+        // 推送内容到ContentResolver
+        Uri pushIntoContentResolver(Context context, long noteId) {
+            if (noteId <= 0) {
+                throw new IllegalArgumentException("Wrong note id:" + noteId);  // 检查笔记ID是否合法
+            }
+
+            ArrayList<ContentProviderOperation> operationList = new ArrayList<ContentProviderOperation>();  // 存储所有操作
+            ContentProviderOperation.Builder builder = null;
+
+            // 插入或更新文本数据
+            if(mTextDataValues.size() > 0) {
+                mTextDataValues.put(DataColumns.NOTE_ID, noteId);  // 设置笔记ID
+                if (mTextDataId == 0) {
+                    mTextDataValues.put(DataColumns.MIME_TYPE, TextNote.CONTENT_ITEM_TYPE);  // 设置MIME类型
+                    Uri uri = context.getContentResolver().insert(Notes.CONTENT_DATA_URI, mTextDataValues);  // 插入数据
+                    try {
+                        setTextDataId(Long.valueOf(uri.getPathSegments().get(1)));  // 获取文本数据ID
+                    } catch (NumberFormatException e) {
+                        Log.e(TAG, "Insert new text data fail with noteId" + noteId);
+                        mTextDataValues.clear();  // 清空数据
+                        return null;
+                    }
+                } else {
+                    builder = ContentProviderOperation.newUpdate(ContentUris.withAppendedId(
+                            Notes.CONTENT_DATA_URI, mTextDataId));  // 更新已有的文本数据
+                    builder.withValues(mTextDataValues);
+                    operationList.add(builder.build());
+                }
+                mTextDataValues.clear();  // 清空文本数据
+            }
+
+            // 插入或更新通话数据
+            if(mCallDataValues.size() > 0) {
+                mCallDataValues.put(DataColumns.NOTE_ID, noteId);  // 设置笔记ID
+                if (mCallDataId == 0) {
+                    mCallDataValues.put(DataColumns.MIME_TYPE, CallNote.CONTENT_ITEM_TYPE);  // 设置MIME类型
+                    Uri uri = context.getContentResolver().insert(Notes.CONTENT_DATA_URI, mCallDataValues);  // 插入数据
+                    try {
+                        setCallDataId(Long.valueOf(uri.getPathSegments().get(1)));  // 获取通话数据ID
+                    } catch (NumberFormatException e) {
+                        Log.e(TAG, "Insert new call data fail with noteId" + noteId);
+                        mCallDataValues.clear();  // 清空数据
+                        return null;
+                    }
+                } else {
+                    builder = ContentProviderOperation.newUpdate(ContentUris.withAppendedId(
+                            Notes.CONTENT_DATA_URI, mCallDataId));  // 更新已有的通话数据
+                    builder.withValues(mCallDataValues);
+                    operationList.add(builder.build());
+                }
+                mCallDataValues.clear();  // 清空通话数据
+            }
+
+            // 执行所有操作
+            if (operationList.size() > 0) {
+                try {
+                    ContentProviderResult[] results = context.getContentResolver().applyBatch(
+                            Notes.AUTHORITY, operationList);  // 批量执行操作
+                    return (results == null || results.length == 0 || results[0] == null) ? null
+                            : ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId);  // 返回URI
+                } catch (RemoteException e) {
+                    Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));
+                    return null;
+                } catch (OperationApplicationException e) {
+                    Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));
+                    return null;
+                }
+            }
+            return null;
+        }
+    }
+}

src/NoteEditActivity.java

@@ -0,0 +1,265 @@
+/**
+ * 版权声明，说明该代码是MiCode开源社区的版权所有，并在Apache License 2.0下授权。
+ */
+
+package net.micode.notes.ui;
+
+// 导入所需的Android库和自定义包
+
+public class NoteEditActivity extends Activity implements OnClickListener,
+        NoteSettingChangedListener, OnTextViewChangeListener {
+    // 内部类，用于持有笔记标题区域的视图元素
+    private class HeadViewHolder {
+        public TextView tvModified;
+        public ImageView ivAlertIcon;
+        public TextView tvAlertDate;
+        public ImageView ibSetBgColor;
+    }
+
+    // 定义背景颜色选择器和字体大小选择器的映射关系
+    private static final Map<Integer, Integer> sBgSelectorBtnsMap = new HashMap<Integer, Integer>();
+    static {
+        // 初始化背景颜色按钮映射
+    }
+    private static final Map<Integer, Integer> sBgSelectorSelectionMap = new HashMap<Integer, Integer>();
+    static {
+        // 初始化背景颜色选择器映射
+    }
+    private static final Map<Integer, Integer> sFontSizeBtnsMap = new HashMap<Integer, Integer>();
+    static {
+        // 初始化字体大小按钮映射
+    }
+    private static final Map<Integer, Integer> sFontSelectorSelectionMap = new HashMap<Integer, Integer>();
+    static {
+        // 初始化字体大小选择器映射
+    }
+
+    // 类变量定义
+    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;
+
+    // onCreate方法，初始化Activity
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        this.setContentView(R.layout.note_edit);
+        // 省略了部分代码...
+    }
+
+    // onRestoreInstanceState方法，用于在Activity被系统销毁后恢复状态
+    @Override
+    protected void onRestoreInstanceState(Bundle savedInstanceState) {
+        super.onRestoreInstanceState(savedInstanceState);
+        // 省略了部分代码...
+    }
+
+    // initActivityState方法，初始化Activity状态
+    private boolean initActivityState(Intent intent) {
+        // 省略了部分代码...
+    }
+
+    // onResume方法，初始化笔记屏幕
+    @Override
+    protected void onResume() {
+        super.onResume();
+        initNoteScreen();
+    }
+
+    // initNoteScreen方法，初始化笔记屏幕视图
+    private void initNoteScreen() {
+        // 省略了部分代码...
+    }
+
+    // onNewIntent方法，处理新的Intent
+    @Override
+    protected void onNewIntent(Intent intent) {
+        super.onNewIntent(intent);
+        initActivityState(intent);
+    }
+
+    // onSaveInstanceState方法，保存Activity状态
+    @Override
+    protected void onSaveInstanceState(Bundle outState) {
+        super.onSaveInstanceState(outState);
+        // 省略了部分代码...
+    }
+
+    // dispatchTouchEvent方法，处理触摸事件
+    @Override
+    public boolean dispatchTouchEvent(MotionEvent ev) {
+        // 省略了部分代码...
+    }
+
+    // inRangeOfView方法，判断触摸事件是否在视图范围内
+    private boolean inRangeOfView(View view, MotionEvent ev) {
+        // 省略了部分代码...
+    }
+
+    // initResources方法，初始化资源
+    private void initResources() {
+        // 省略了部分代码...
+    }
+
+    // onPause方法，保存笔记
+    @Override
+    protected void onPause() {
+        super.onPause();
+        if(saveNote()) {
+            Log.d(TAG, "Note data was saved with length:" + mWorkingNote.getContent().length());
+        }
+        clearSettingState();
+    }
+
+    // updateWidget方法，更新Widget
+    private void updateWidget() {
+        // 省略了部分代码...
+    }
+
+    // onClick方法，处理点击事件
+    public void onClick(View v) {
+        // 省略了部分代码...
+    }
+
+    // onBackPressed方法，处理返回键事件
+    @Override
+    public void onBackPressed() {
+        // 省略了部分代码...
+    }
+
+    // clearSettingState方法，清除设置状态
+    private boolean clearSettingState() {
+        // 省略了部分代码...
+    }
+
+    // onBackgroundColorChanged方法，处理背景颜色变化
+    public void onBackgroundColorChanged() {
+        // 省略了部分代码...
+    }
+
+    // onPrepareOptionsMenu方法，准备菜单
+    @Override
+    public boolean onPrepareOptionsMenu(Menu menu) {
+        // 省略了部分代码...
+    }
+
+    // onOptionsItemSelected方法，处理菜单项点击事件
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        // 省略了部分代码...
+    }
+
+    // setReminder方法，设置提醒
+    private void setReminder() {
+        // 省略了部分代码...
+    }
+
+    // sendTo方法，分享笔记到其他应用
+    private void sendTo(Context context, String info) {
+        // 省略了部分代码...
+    }
+
+    // createNewNote方法，创建新笔记
+    private void createNewNote() {
+        // 省略了部分代码...
+    }
+
+    // deleteCurrentNote方法，删除当前笔记
+    private void deleteCurrentNote() {
+        // 省略了部分代码...
+    }
+
+    // isSyncMode方法，判断是否是同步模式
+    private boolean isSyncMode() {
+        // 省略了部分代码...
+    }
+
+    // onClockAlertChanged方法，处理时钟提醒变化
+    public void onClockAlertChanged(long date, boolean set) {
+        // 省略了部分代码...
+    }
+
+    // onWidgetChanged方法，处理Widget变化
+    public void onWidgetChanged() {
+        // 省略了部分代码...
+    }
+
+    // onEditTextDelete方法，处理编辑文本删除
+    public void onEditTextDelete(int index, String text) {
+        // 省略了部分代码...
+    }
+
+    // onEditTextEnter方法，处理编辑文本回车
+    public void onEditTextEnter(int index, String text) {
+        // 省略了部分代码...
+    }
+
+    // switchToListMode方法，切换到列表模式
+    private void switchToListMode(String text) {
+        // 省略了部分代码...
+    }
+
+    // getHighlightQueryResult方法，高亮查询结果
+    private Spannable getHighlightQueryResult(String fullText, String userQuery) {
+        // 省略了部分代码...
+    }
+
+    // getListItem方法，获取列表项视图
+    private View getListItem(String item, int index) {
+        // 省略了部分代码...
+    }
+
+    // onTextChange方法，处理文本变化
+    public void onTextChange(int index, boolean hasText) {
+        // 省略了部分代码...
+    }
+
+    // onCheckListModeChanged方法，处理检查列表模式变化
+    public void onCheckListModeChanged(int oldMode, int newMode) {
+        // 省略了部分代码...
+    }
+
+    // getWorkingText方法，获取工作文本
+    private boolean getWorkingText() {
+        // 省略了部分代码...
+    }
+
+    // saveNote方法，保存笔记
+    private boolean saveNote() {
+        // 省略了部分代码...
+    }
+
+    // sendToDesktop方法，发送到桌面
+    private void sendToDesktop() {
+        // 省略了部分代码...
+    }
+
+    // makeShortcutIconTitle方法，制作快捷方式图标标题
+    private String makeShortcutIconTitle(String content) {
+        // 省略了部分代码...
+    }
+
+    // showToast方法，显示Toast提示
+    private void showToast(int resId) {
+        showToast(resId, Toast.LENGTH_SHORT);
+    }
+
+    // showToast方法，显示Toast提示（带持续时间）
+    private void showToast(int resId, int duration) {
+        
+    }
+}

src/NoteEditText.java

@@ -0,0 +1,269 @@
+/*
+ * 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;
+
+/**
+ * NoteEditText 类继承自 EditText，用于处理带有链接文本的编辑框。
+ * 它支持文本链接的点击、删除和回车事件的处理，并且能够处理焦点变化时的文本变化。
+ */
+public class NoteEditText extends EditText {
+    private static final String TAG = "NoteEditText";
+
+    // 当前 NoteEditText 的索引，用于区分不同的 EditText。
+    private int mIndex;
+    
+    // 删除之前的光标位置，用于判断删除操作。
+    private int mSelectionStartBeforeDelete;
+
+    // 定义三种链接方案：电话、网页和电子邮件。
+    private static final String SCHEME_TEL = "tel:";
+    private static final String SCHEME_HTTP = "http:";
+    private static final String SCHEME_EMAIL = "mailto:";
+
+    // 用于映射链接方案和对应的菜单项资源。
+    private static final Map<String, Integer> sSchemaActionResMap = new HashMap<String, Integer>();
+    
+    static {
+        // 初始化链接方案和对应的菜单项。
+        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);
+    }
+
+    /**
+     * 用于监听 NoteEditText 变化的接口。可以监听删除、回车和文本变化。
+     */
+    public interface OnTextViewChangeListener {
+        /**
+         * 当按下删除键时调用，删除当前编辑框中的文本。
+         * @param index 当前编辑框的索引
+         * @param text 删除的文本内容
+         */
+        void onEditTextDelete(int index, String text);
+
+        /**
+         * 当按下回车键时调用，添加新的编辑框。
+         * @param index 新编辑框的索引
+         * @param text 当前编辑框的内容
+         */
+        void onEditTextEnter(int index, String text);
+
+        /**
+         * 当文本发生变化时，隐藏或显示操作项。
+         * @param index 当前编辑框的索引
+         * @param hasText 是否有文本
+         */
+        void onTextChange(int index, boolean hasText);
+    }
+
+    // 存储 OnTextViewChangeListener 的实例
+    private OnTextViewChangeListener mOnTextViewChangeListener;
+
+    // 构造函数，初始化 NoteEditText。
+    public NoteEditText(Context context) {
+        super(context, null);
+        mIndex = 0;
+    }
+
+    // 设置当前 NoteEditText 的索引
+    public void setIndex(int index) {
+        mIndex = index;
+    }
+
+    // 设置监听文本变化的监听器
+    public void setOnTextViewChangeListener(OnTextViewChangeListener listener) {
+        mOnTextViewChangeListener = listener;
+    }
+
+    // 通过属性集初始化 NoteEditText
+    public NoteEditText(Context context, AttributeSet attrs) {
+        super(context, attrs, android.R.attr.editTextStyle);
+    }
+
+    // 通过属性集和默认样式初始化 NoteEditText
+    public NoteEditText(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+    }
+
+    /**
+     * 处理触摸事件，当点击文本时更新光标的位置。
+     * @param event 触摸事件
+     * @return 是否处理该事件
+     */
+    @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(); // 获取点击点的 x 坐标
+                y -= getTotalPaddingTop();  // 获取点击点的 y 坐标
+                x += getScrollX();          // 获取滚动的 x 偏移
+                y += getScrollY();          // 获取滚动的 y 偏移
+
+                Layout layout = getLayout(); // 获取文本布局
+                int line = layout.getLineForVertical(y);  // 获取点击点所在的行
+                int off = layout.getOffsetForHorizontal(line, x);  // 获取点击点的偏移位置
+                Selection.setSelection(getText(), off);  // 设置光标位置
+                break;
+        }
+        return super.onTouchEvent(event);
+    }
+
+    /**
+     * 处理按键事件，主要是处理回车和删除键。
+     * @param keyCode 按键代码
+     * @param event 按键事件
+     * @return 是否处理该事件
+     */
+    @Override
+    public boolean onKeyDown(int keyCode, KeyEvent event) {
+        switch (keyCode) {
+            case KeyEvent.KEYCODE_ENTER:
+                // 按下回车键时，如果设置了监听器则继续处理
+                if (mOnTextViewChangeListener != null) {
+                    return false;
+                }
+                break;
+            case KeyEvent.KEYCODE_DEL:
+                // 按下删除键时记录光标位置
+                mSelectionStartBeforeDelete = getSelectionStart();
+                break;
+            default:
+                break;
+        }
+        return super.onKeyDown(keyCode, event);
+    }
+
+    /**
+     * 处理按键释放事件，主要处理删除和回车键的后续动作。
+     * @param keyCode 按键代码
+     * @param event 按键事件
+     * @return 是否处理该事件
+     */
+    @Override
+    public boolean onKeyUp(int keyCode, KeyEvent event) {
+        switch (keyCode) {
+            case KeyEvent.KEYCODE_DEL:
+                if (mOnTextViewChangeListener != null) {
+                    // 如果删除键按下时光标位置在起始位置并且索引不为 0，则通知监听器删除操作
+                    if (0 == mSelectionStartBeforeDelete && mIndex != 0) {
+                        mOnTextViewChangeListener.onEditTextDelete(mIndex, getText().toString());
+                        return true;
+                    }
+                } else {
+                    Log.d(TAG, "OnTextViewChangeListener was not setted");
+                }
+                break;
+            case KeyEvent.KEYCODE_ENTER:
+                if (mOnTextViewChangeListener != null) {
+                    // 回车键按下时，将当前文本分割并传递给监听器
+                    int selectionStart = getSelectionStart();
+                    String text = getText().subSequence(selectionStart, length()).toString();
+                    setText(getText().subSequence(0, selectionStart)); // 设置文本为回车前的内容
+                    mOnTextViewChangeListener.onEditTextEnter(mIndex + 1, text); // 通知监听器添加新的编辑框
+                } else {
+                    Log.d(TAG, "OnTextViewChangeListener was not setted");
+                }
+                break;
+            default:
+                break;
+        }
+        return super.onKeyUp(keyCode, event);
+    }
+
+    /**
+     * 处理焦点变化事件，通知监听器文本变化。
+     * @param focused 是否获得焦点
+     * @param direction 焦点方向
+     * @param previouslyFocusedRect 焦点变化前的位置
+     */
+    @Override
+    protected void onFocusChanged(boolean focused, int direction, Rect previouslyFocusedRect) {
+        if (mOnTextViewChangeListener != null) {
+            if (!focused && TextUtils.isEmpty(getText())) {
+                mOnTextViewChangeListener.onTextChange(mIndex, false); // 如果文本为空且失去焦点，则通知监听器
+            } else {
+                mOnTextViewChangeListener.onTextChange(mIndex, true); // 否则通知监听器文本有内容
+            }
+        }
+        super.onFocusChanged(focused, direction, previouslyFocusedRect);
+    }
+
+    /**
+     * 创建上下文菜单，当文本中包含 URL 链接时，显示相应的菜单项。
+     * @param menu 上下文菜单
+     */
+    @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);
+
+            // 获取选中的文本中的 URLSpan
+            final URLSpan[] urls = ((Spanned) getText()).getSpans(min, max, URLSpan.class);
+            if (urls.length == 1) {
+                int defaultResId = 0;
+                // 根据 URL 的 Scheme 映射到相应的菜单项
+                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; // 如果没有匹配的 Scheme，则使用默认菜单项
+                }
+
+                menu.add(0, 0, 0, defaultResId).setOnMenuItemClickListener(
+                        new OnMenuItemClickListener() {
+                            public boolean onMenuItemClick(MenuItem item) {
+                                // 当点击菜单项时，执行 URLSpan 的点击事件
+                                urls[0].onClick(NoteEditText.this);
+                                return true;
+                            }
+                        });
+            }
+        }
+        super.onCreateContextMenu(menu);
+    }
+}

src/NoteItemData.java

@@ -0,0 +1,255 @@
+/*
+ * 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;
+
+/**
+ * NoteItemData 类封装了从数据库中读取的笔记项数据。它提供了对笔记项的各种属性和状态的访问，
+ * 包括笔记的创建日期、修改日期、是否有附件、是否有提醒、笔记的类型等。
+ */
+public class NoteItemData {
+    // 定义查询数据库时的投影字段（即需要从数据库查询的列）
+    static final String [] PROJECTION = new String [] {
+        NoteColumns.ID,               // 笔记ID
+        NoteColumns.ALERTED_DATE,      // 提醒日期
+        NoteColumns.BG_COLOR_ID,       // 背景颜色ID
+        NoteColumns.CREATED_DATE,      // 创建日期
+        NoteColumns.HAS_ATTACHMENT,    // 是否有附件
+        NoteColumns.MODIFIED_DATE,     // 修改日期
+        NoteColumns.NOTES_COUNT,       // 笔记数量
+        NoteColumns.PARENT_ID,         // 父文件夹ID
+        NoteColumns.SNIPPET,           // 笔记内容摘要
+        NoteColumns.TYPE,              // 笔记类型
+        NoteColumns.WIDGET_ID,         // 小部件ID
+        NoteColumns.WIDGET_TYPE,       // 小部件类型
+    };
+
+    // 各列索引
+    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;
+
+    // 笔记项的各个属性
+    private long mId;                        // 笔记ID
+    private long mAlertDate;                 // 提醒日期
+    private int mBgColorId;                  // 背景颜色ID
+    private long mCreatedDate;               // 创建日期
+    private boolean mHasAttachment;          // 是否有附件
+    private long mModifiedDate;              // 修改日期
+    private int mNotesCount;                 // 笔记数量
+    private long mParentId;                  // 父文件夹ID
+    private String mSnippet;                 // 笔记摘要
+    private int mType;                       // 笔记类型
+    private int mWidgetId;                   // 小部件ID
+    private int mWidgetType;                 // 小部件类型
+    private String mName;                    // 联系人名称
+    private String mPhoneNumber;             // 电话号码
+
+    // 状态标志
+    private boolean mIsLastItem;             // 是否是最后一项
+    private boolean mIsFirstItem;            // 是否是第一项
+    private boolean mIsOnlyOneItem;          // 是否是唯一一项
+    private boolean mIsOneNoteFollowingFolder; // 是否是单个笔记跟随文件夹
+    private boolean mIsMultiNotesFollowingFolder; // 是否有多个笔记跟随文件夹
+
+    /**
+     * 构造函数，根据给定的 Context 和 Cursor 从数据库中读取笔记项数据，并初始化该对象。
+     * @param context 上下文
+     * @param cursor 数据库游标，包含笔记项的数据
+     */
+    public NoteItemData(Context context, Cursor cursor) {
+        // 从游标中获取笔记项数据并初始化类的各个属性
+        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); // 判断是否有附件
+        mModifiedDate = cursor.getLong(MODIFIED_DATE_COLUMN);
+        mNotesCount = cursor.getInt(NOTES_COUNT_COLUMN);
+        mParentId = cursor.getLong(PARENT_ID_COLUMN);
+        mSnippet = cursor.getString(SNIPPET_COLUMN); // 获取笔记摘要
+        // 清理掉摘要中的标签
+        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);
+
+        // 如果笔记属于通话记录文件夹，则尝试获取联系人的名称和电话号码
+        mPhoneNumber = "";
+        if (mParentId == Notes.ID_CALL_RECORD_FOLDER) {
+            mPhoneNumber = DataUtils.getCallNumberByNoteId(context.getContentResolver(), mId);
+            if (!TextUtils.isEmpty(mPhoneNumber)) {
+                mName = Contact.getContact(context, mPhoneNumber); // 获取联系人名称
+                if (mName == null) {
+                    mName = mPhoneNumber; // 如果没有联系人名称，则使用电话号码
+                }
+            }
+        }
+
+        // 如果没有联系人名称，则设置为空字符串
+        if (mName == null) {
+            mName = "";
+        }
+
+        // 检查笔记项在数据库中的位置（是否是第一个、最后一个或唯一项等）
+        checkPostion(cursor);
+    }
+
+    /**
+     * 根据游标位置判断该笔记项的状态（例如：是否为第一个、最后一个项等）
+     * @param cursor 数据库游标
+     */
+    private void checkPostion(Cursor cursor) {
+        mIsLastItem = cursor.isLast(); // 判断是否是最后一项
+        mIsFirstItem = cursor.isFirst(); // 判断是否是第一项
+        mIsOnlyOneItem = (cursor.getCount() == 1); // 判断是否是唯一一项
+        mIsMultiNotesFollowingFolder = false;
+        mIsOneNoteFollowingFolder = false;
+
+        // 如果笔记是普通笔记且不是第一个项，检查是否紧跟在文件夹后面
+        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) {
+                    // 如果当前笔记项后面有多个笔记，则标记为多个笔记跟随文件夹
+                    if (cursor.getCount() > (position + 1)) {
+                        mIsMultiNotesFollowingFolder = true;
+                    } else {
+                        mIsOneNoteFollowingFolder = true; // 否则标记为单个笔记跟随文件夹
+                    }
+                }
+                if (!cursor.moveToNext()) {
+                    throw new IllegalStateException("cursor move to previous but can't move back");
+                }
+            }
+        }
+    }
+
+    // 以下是公开的访问方法，用于获取该笔记项的各个属性值
+
+    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));
+    }
+
+    /**
+     * 从游标中获取笔记类型
+     * @param cursor 数据库游标
+     * @return 笔记类型
+     */
+    public static int getNoteType(Cursor cursor) {
+        return cursor.getInt(TYPE_COLUMN);
+    }
+}

src/NoteWidgetProvider.java

@@ -0,0 +1,163 @@
+/*
+ * 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;
+// 导入所需的Android类和接口
+
+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;
+
+// 定义一个抽象类NoteWidgetProvider，继承自AppWidgetProvider
+public abstract class NoteWidgetProvider extends AppWidgetProvider {
+    // 定义查询数据库时需要的列
+    public static final String [] PROJECTION = new String [] {
+        NoteColumns.ID,
+        NoteColumns.BG_COLOR_ID,
+        NoteColumns.SNIPPET
+    };
+
+    // 定义列的索引
+    public static final int COLUMN_ID           = 0;
+    public static final int COLUMN_BG_COLOR_ID  = 1;
+    public static final int COLUMN_SNIPPET      = 2;
+
+    // 定义日志标签
+    private static final String TAG = "NoteWidgetProvider";
+
+    // 当小部件被删除时调用
+    @Override
+    public void onDeleted(Context context, int[] appWidgetIds) {
+        // 更新数据库，将被删除小部件的WIDGET_ID设置为无效
+        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])});
+        }
+    }
+
+    // 获取小部件的笔记信息
+    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);
+    }
+
+    // 更新小部件
+    protected void update(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
+        update(context, appWidgetManager, appWidgetIds, false);
+    }
+
+    // 更新小部件，可以设置隐私模式
+    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) {
+                // 默认背景ID
+                int bgId = ResourceParser.getDefaultBgId(context);
+                // 笔记摘要
+                String snippet = "";
+                // 编辑笔记的Intent
+                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());
+
+                // 获取笔记信息的Cursor
+                Cursor c = getNoteWidgetInfo(context, appWidgetIds[i]);
+                if (c != null && c.moveToFirst()) {
+                    if (c.getCount() > 1) {
+                        // 如果有多个相同的widget id，记录错误并返回
+                        Log.e(TAG, "Multiple message with same widget id:" + appWidgetIds[i]);
+                        c.close();
+                        return;
+                    }
+                    // 获取笔记摘要和背景ID
+                    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 {
+                    // 如果没有找到笔记，显示默认文本
+                    snippet = context.getResources().getString(R.string.widget_havenot_content);
+                    intent.setAction(Intent.ACTION_INSERT_OR_EDIT);
+                }
+
+                // 关闭Cursor
+                if (c != null) {
+                    c.close();
+                }
+
+                // 创建RemoteViews对象
+                RemoteViews rv = new RemoteViews(context.getPackageName(), getLayoutId());
+                // 设置背景资源
+                rv.setImageViewResource(R.id.widget_bg_image, getBgResourceId(bgId));
+                // 将背景ID放入Intent
+                intent.putExtra(Notes.INTENT_EXTRA_BACKGROUND_ID, bgId);
+                /**
+                 * 生成PendingIntent，用于启动宿主Activity
+                 */
+                PendingIntent pendingIntent = null;
+                if (privacyMode) {
+                    // 如果是隐私模式，显示隐私模式文本
+                    rv.setTextViewText(R.id.widget_text,
+                            context.getString(R.string.widget_under_visit_mode));
+                    // 创建PendingIntent，用于启动NotesListActivity
+                    pendingIntent = PendingIntent.getActivity(context, appWidgetIds[i], new Intent(
+                            context, NotesListActivity.class), PendingIntent.FLAG_UPDATE_CURRENT);
+                } else {
+                    // 显示笔记摘要
+                    rv.setTextViewText(R.id.widget_text, snippet);
+                    // 创建PendingIntent，用于启动NoteEditActivity
+                    pendingIntent = PendingIntent.getActivity(context, appWidgetIds[i], intent,
+                            PendingIntent.FLAG_UPDATE_CURRENT);
+                }
+
+                // 设置点击事件
+                rv.setOnClickPendingIntent(R.id.widget_text, pendingIntent);
+                // 更新小部件
+                appWidgetManager.updateAppWidget(appWidgetIds[i], rv);
+            }
+        }
+    }
+
+    // 获取背景资源ID的方法，需要子类实现
+    protected abstract int getBgResourceId(int bgId);
+
+    // 获取布局资源ID的方法，需要子类实现
+    protected abstract int getLayoutId();
+
+    // 获取小部件类型的方法，需要子类实现
+    protected abstract int getWidgetType();
+}

src/NoteWidgetProvider_2x.java

@@ -0,0 +1,55 @@
+/*
+ * 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;
+
+// 定义一个具体的NoteWidgetProvider_2x类，继承自NoteWidgetProvider
+public class NoteWidgetProvider_2x extends NoteWidgetProvider {
+    // 当小部件需要更新时调用
+    @Override
+    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
+        // 调用父类的update方法进行更新
+        super.update(context, appWidgetManager, appWidgetIds);
+    }
+
+    // 获取小部件的布局资源ID
+    @Override
+    protected int getLayoutId() {
+        // 返回2x小部件的布局资源ID
+        return R.layout.widget_2x;
+    }
+
+    // 获取小部件的背景资源ID
+    @Override
+    protected int getBgResourceId(int bgId) {
+        // 根据传入的背景ID，返回对应的2x小部件背景资源ID
+        return ResourceParser.WidgetBgResources.getWidget2xBgResource(bgId);
+    }
+
+    // 获取小部件的类型
+    @Override
+    protected int getWidgetType() {
+        // 返回小部件的类型，这里是2x类型的笔记小部件
+        return Notes.TYPE_WIDGET_2X;
+    }
+}

src/NoteWidgetProvider_4x.java

@@ -0,0 +1,55 @@
+/*
+ * 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;
+
+// 定义一个具体的NoteWidgetProvider_4x类，继承自NoteWidgetProvider
+public class NoteWidgetProvider_4x extends NoteWidgetProvider {
+    // 当小部件需要更新时调用
+    @Override
+    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
+        // 调用父类的update方法进行更新
+        super.update(context, appWidgetManager, appWidgetIds);
+    }
+
+    // 获取小部件的布局资源ID
+    @Override
+    protected int getLayoutId() {
+        // 返回4x小部件的布局资源ID
+        return R.layout.widget_4x;
+    }
+
+    // 获取小部件的背景资源ID
+    @Override
+    protected int getBgResourceId(int bgId) {
+        // 根据传入的背景ID，返回对应的4x小部件背景资源ID
+        return ResourceParser.WidgetBgResources.getWidget4xBgResource(bgId);
+    }
+
+    // 获取小部件的类型
+    @Override
+    protected int getWidgetType() {
+        // 返回小部件的类型，这里是4x类型的笔记小部件
+        return Notes.TYPE_WIDGET_4X;
+    }
+}

src/Notes.java

@@ -0,0 +1,206 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.data;
+
+import android.net.Uri;
+
+public class Notes {
+    // 认证标识符，用于在内容提供者中区分不同的数据集合
+    public static final String AUTHORITY = "micode_notes";
+
+    // 用于日志记录的标签
+    public static final String TAG = "Notes";
+
+    // 用于表示不同类型的文件
+    public static final int TYPE_NOTE = 0;
+    public static final int TYPE_FOLDER = 1;
+    public static final int TYPE_SYSTEM = 2;
+
+    /**
+     * 以下ID是系统文件夹的标识符
+     * {@link Notes#ID_ROOT_FOLDER} 表示默认文件夹
+     * {@link Notes#ID_TEMPARAY_FOLDER} 表示临时文件夹
+     * {@link Notes#ID_CALL_RECORD_FOLDER} 表示用于存储通话记录的文件夹
+     */
+    public static final int ID_ROOT_FOLDER = 0;
+    public static final int ID_TEMPARAY_FOLDER = -1;
+    public static final int ID_CALL_RECORD_FOLDER = -2;
+    public static final int ID_TRASH_FOLER = -3;
+
+    // Intent 额外数据的键，用于传递提醒日期、背景颜色、Widget ID、文件夹ID等信息
+    public static final String INTENT_EXTRA_ALERT_DATE = "net.micode.notes.alert_date";
+    public static final String INTENT_EXTRA_BACKGROUND_ID = "net.micode.notes.background_color_id";
+    public static final String INTENT_EXTRA_WIDGET_ID = "net.micode.notes.widget_id";
+    public static final String INTENT_EXTRA_WIDGET_TYPE = "net.micode.notes.widget_type";
+    public static final String INTENT_EXTRA_FOLDER_ID = "net.micode.notes.folder_id";
+    public static final String INTENT_EXTRA_CALL_DATE = "net.micode.notes.call_date";
+
+    // Widget 类型常量
+    public static final int TYPE_WIDGET_INVALIDE = -1;
+    public static final int TYPE_WIDGET_2X = 0;
+    public static final int TYPE_WIDGET_4X = 1;
+
+    public static class DataConstants {
+        // 文本便签的 MIME 类型
+        public static final String NOTE = TextNote.CONTENT_ITEM_TYPE;
+        // 通话记录便签的 MIME 类型
+        public static final String CALL_NOTE = CallNote.CONTENT_ITEM_TYPE;
+    }
+
+    /**
+     * Uri 用于查询所有的便签和文件夹
+     */
+    public static final Uri CONTENT_NOTE_URI = Uri.parse("content://" + AUTHORITY + "/note");
+
+    /**
+     * Uri 用于查询具体数据
+     */
+    public static final Uri CONTENT_DATA_URI = Uri.parse("content://" + AUTHORITY + "/data");
+
+    /**
+     * NoteColumns 接口定义了便签和文件夹表中的列
+     */
+    public interface NoteColumns {
+        // 唯一标识符
+        public static final String ID = "_id";
+
+        // 父文件夹的 ID
+        public static final String PARENT_ID = "parent_id";
+
+        // 创建日期
+        public static final String CREATED_DATE = "created_date";
+
+        // 最新修改日期
+        public static final String MODIFIED_DATE = "modified_date";
+
+        // 提醒日期
+        public static final String ALERTED_DATE = "alert_date";
+
+        // 文件夹名称或便签内容的摘要
+        public static final String SNIPPET = "snippet";
+
+        // 便签对应的 Widget ID
+        public static final String WIDGET_ID = "widget_id";
+
+        // 便签对应的 Widget 类型
+        public static final String WIDGET_TYPE = "widget_type";
+
+        // 便签的背景颜色 ID
+        public static final String BG_COLOR_ID = "bg_color_id";
+
+        // 是否有附件，1 表示有，0 表示无
+        public static final String HAS_ATTACHMENT = "has_attachment";
+
+        // 文件夹中的便签数量
+        public static final String NOTES_COUNT = "notes_count";
+
+        // 文件类型：文件夹或便签
+        public static final String TYPE = "type";
+
+        // 最近同步的 ID
+        public static final String SYNC_ID = "sync_id";
+
+        // 本地修改标记
+        public static final String LOCAL_MODIFIED = "local_modified";
+
+        // 移动到临时文件夹之前的原父文件夹 ID
+        public static final String ORIGIN_PARENT_ID = "origin_parent_id";
+
+        // Gtask 的 ID
+        public static final String GTASK_ID = "gtask_id";
+
+        // 版本号
+        public static final String VERSION = "version";
+    }
+
+    /**
+     * DataColumns 接口定义了数据表中的列
+     */
+    public interface DataColumns {
+        // 唯一标识符
+        public static final String ID = "_id";
+
+        // MIME 类型
+        public static final String MIME_TYPE = "mime_type";
+
+        // 关联的便签 ID
+        public static final String NOTE_ID = "note_id";
+
+        // 创建日期
+        public static final String CREATED_DATE = "created_date";
+
+        // 最新修改日期
+        public static final String MODIFIED_DATE = "modified_date";
+
+        // 数据内容
+        public static final String CONTENT = "content";
+
+        // 通用数据列，用于存储整数类型数据
+        public static final String DATA1 = "data1";
+
+        // 通用数据列，用于存储整数类型数据
+        public static final String DATA2 = "data2";
+
+        // 通用数据列，用于存储文本类型数据
+        public static final String DATA3 = "data3";
+
+        // 通用数据列，用于存储文本类型数据
+        public static final String DATA4 = "data4";
+
+        // 通用数据列，用于存储文本类型数据
+        public static final String DATA5 = "data5";
+    }
+
+    /**
+     * TextNote 类继承自 DataColumns，专门处理文本便签相关的数据
+     */
+    public static final class TextNote implements DataColumns {
+        // 模式，表示便签是否处于检查列表模式，1 为检查列表模式，0 为普通模式
+        public static final String MODE = DATA1;
+
+        public static final int MODE_CHECK_LIST = 1;
+
+        // MIME 类型，用于表示文本便签的集合
+        public static final String CONTENT_TYPE = "vnd.android.cursor.dir/text_note";
+
+        // MIME 类型，用于表示单个文本便签
+        public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/text_note";
+
+        // Uri 用于查询文本便签
+        public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/text_note");
+    }
+
+    /**
+     * CallNote 类继承自 DataColumns，专门处理通话记录便签相关的数据
+     */
+    public static final class CallNote implements DataColumns {
+        // 通话日期
+        public static final String CALL_DATE = DATA1;
+
+        // 通话的电话号码
+        public static final String PHONE_NUMBER = DATA3;
+
+        // MIME 类型，用于表示通话记录便签的集合
+        public static final String CONTENT_TYPE = "vnd.android.cursor.dir/call_note";
+
+        // MIME 类型，用于表示单个通话记录便签
+        public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/call_note";
+
+        // Uri 用于查询通话记录便签
+        public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/call_note");
+    }
+}

src/NotesDatabaseHelper.java

@@ -0,0 +1,283 @@
+/*
+ * 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;
+
+/**
+ * NotesDatabaseHelper类用于管理数据库的创建和升级，继承自SQLiteOpenHelper类。
+ */
+public class NotesDatabaseHelper extends SQLiteOpenHelper {
+    // 数据库名
+    private static final String DB_NAME = "note.db";
+    // 数据库版本
+    private static final int DB_VERSION = 4;
+
+    // 数据表的名称
+    public interface TABLE {
+        public static final String NOTE = "note";
+        public static final String DATA = "data";
+    }
+
+    private static final String TAG = "NotesDatabaseHelper";
+
+    // 单例模式
+    private static NotesDatabaseHelper mInstance;
+
+    // 创建note表的SQL语句
+    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" +
+        ")";
+
+    // 创建data表的SQL语句
+    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 ''" +
+        ")";
+
+    // 创建data表中NOTE_ID的索引
+    private static final String CREATE_DATA_NOTE_ID_INDEX_SQL =
+        "CREATE INDEX IF NOT EXISTS note_id_index ON " +
+        TABLE.DATA + "(" + DataColumns.NOTE_ID + ");";
+
+    /**
+     * 增加文件夹中的笔记数，当笔记移动到该文件夹时
+     */
+    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";
+
+    /**
+     * 减少文件夹中的笔记数，当笔记从该文件夹中移除时
+     */
+    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";
+
+    /**
+     * 增加文件夹中的笔记数，当插入新的笔记到该文件夹时
+     */
+    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";
+
+    /**
+     * 减少文件夹中的笔记数，当从该文件夹删除笔记时
+     */
+    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";
+
+    /**
+     * 当插入类型为NOTE的数据时更新笔记内容
+     */
+    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";
+
+    /**
+     * 当类型为NOTE的数据更新时，更新笔记内容
+     */
+    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";
+
+    /**
+     * 当类型为NOTE的数据删除时，更新笔记内容
+     */
+    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";
+
+    /**
+     * 当笔记被删除时，删除相关数据
+     */
+    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";
+
+    /**
+     * 当文件夹被删除时，删除该文件夹中的笔记
+     */
+    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";
+
+    /**
+     * 获取数据库实例，确保数据库只有一个实例
+     *
+     * @param context 应用上下文
+     * @return 数据库实例
+     */
+    public static synchronized NotesDatabaseHelper getInstance(Context context) {
+        if (mInstance == null) {
+            mInstance = new NotesDatabaseHelper(context);
+        }
+        return mInstance;
+    }
+
+    /**
+     * 构造函数，初始化数据库
+     *
+     * @param context 应用上下文
+     */
+    private NotesDatabaseHelper(Context context) {
+        super(context, DB_NAME, null, DB_VERSION);
+    }
+
+    /**
+     * 创建数据库，初始化数据表
+     *
+     * @param db SQLite数据库实例
+     */
+    @Override
+    public void onCreate(SQLiteDatabase db) {
+        Log.d(TAG, "onCreate");
+        db.execSQL(CREATE_NOTE_TABLE_SQL);
+        db.execSQL(CREATE_DATA_TABLE_SQL);
+        db.execSQL(CREATE_DATA_NOTE_ID_INDEX_SQL);
+
+        db.execSQL(NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER);
+        db.execSQL(NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER);
+        db.execSQL(NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER);
+        db.execSQL(NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER);
+
+        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);
+
+        db.execSQL(NOTE_DELETE_DATA_ON_DELETE_TRIGGER);
+        db.execSQL(FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER);
+
+        // 初始化默认文件夹
+        initDefaultFolder(db);
+    }
+
+    /**
+     * 更新数据库，处理数据库版本升级
+     *
+     * @param db         SQLite数据库实例
+     * @param oldVersion 旧版本号
+     * @param newVersion 新版本号
+     */
+    @Override
+    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
+        Log.d(TAG, "onUpgrade");
+        // 这里可以根据不同版本号处理升级逻辑，当前暂时删除旧表并重新创建
+        if (oldVersion != newVersion) {
+            db.execSQL("DROP TABLE IF EXISTS " + TABLE.NOTE);
+            db.execSQL("DROP TABLE IF EXISTS " + TABLE.DATA);
+            onCreate(db);
+        }
+    }
+
+    /**
+     * 初始化默认文件夹，在第一次创建数据库时调用
+     *
+     * @param db SQLite数据库实例
+     */
+    private void initDefaultFolder(SQLiteDatabase db) {
+        ContentValues values = new ContentValues();
+        values.put(NoteColumns.ID, Notes.ID_ROOT_FOLDER);
+        values.put(NoteColumns.SNIPPET, "ROOT");
+        values.put(NoteColumns.TYPE, Notes.TYPE_FOLDER);
+        db.insert(TABLE.NOTE, null, values);
+    }
+}

src/NotesListActivity.java

@@ -0,0 +1,230 @@
+/**
+ * 版权声明，说明该代码是MiCode开源社区的版权所有，并在Apache License 2.0下授权。
+ */
+
+package net.micode.notes.ui;
+
+// 导入所需的Android库和自定义包
+
+public class NotesListActivity extends Activity implements OnClickListener, OnItemLongClickListener {
+    // 定义了一些查询操作的token，用于识别不同的后台查询操作
+    private static final int FOLDER_NOTE_LIST_QUERY_TOKEN = 0;
+    private static final int FOLDER_LIST_QUERY_TOKEN      = 1;
+    
+    // 定义了菜单项的ID
+    private static final int MENU_FOLDER_DELETE = 0;
+    private static final int MENU_FOLDER_VIEW = 1;
+    private static final int MENU_FOLDER_CHANGE_NAME = 2;
+    
+    // 定义了用户首次使用应用时显示的介绍信息的SharedPreferences键
+    private static final String PREFERENCE_ADD_INTRODUCTION = "net.micode.notes.introduction";
+    
+    // 枚举，定义了不同的列表编辑状态
+    private enum ListEditState {
+        NOTE_LIST, SUB_FOLDER, CALL_RECORD_FOLDER
+    };
+    
+    // 类变量定义
+    private ListEditState mState;
+    private BackgroundQueryHandler mBackgroundQueryHandler;
+    private NotesListAdapter mNotesListAdapter;
+    private ListView mNotesListView;
+    private Button mAddNewNote;
+    private boolean mDispatch;
+    private int mOriginY;
+    private int mDispatchY;
+    private TextView mTitleBar;
+    private long mCurrentFolderId;
+    private ContentResolver mContentResolver;
+    private ModeCallback mModeCallBack;
+    private static final String TAG = "NotesListActivity";
+    private static final int NOTES_LISTVIEW_SCROLL_RATE = 30;
+    private NoteItemData mFocusNoteDataItem;
+    private static final String NORMAL_SELECTION = NoteColumns.PARENT_ID + "=?";
+    private static final String ROOT_FOLDER_SELECTION = "(" + NoteColumns.TYPE + "<>?"
+            + Notes.TYPE_SYSTEM + " AND " + NoteColumns.PARENT_ID + "=?)" + " OR ("
+            + NoteColumns.ID + "=" + Notes.ID_CALL_RECORD_FOLDER + " AND "
+            + NoteColumns.NOTES_COUNT + ">0)";
+    private final static int REQUEST_CODE_OPEN_NODE = 102;
+    private final static int REQUEST_CODE_NEW_NODE  = 103;
+
+    // onCreate方法，初始化Activity
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.note_list);
+        initResources();
+        
+        // 用户首次使用应用时，插入介绍信息
+        setAppInfoFromRawRes();
+    }
+
+    // onActivityResult方法，处理其他Activity返回的结果
+    @Override
+    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
+        // 省略了部分代码...
+    }
+
+    // setAppInfoFromRawRes方法，从raw资源中读取介绍信息并显示
+    private void setAppInfoFromRawRes() {
+        // 省略了部分代码...
+    }
+
+    // onStart方法，Activity启动时开始异步查询笔记列表
+    @Override
+    protected void onStart() {
+        super.onStart();
+        startAsyncNotesListQuery();
+    }
+
+    // initResources方法，初始化资源
+    private void initResources() {
+        // 省略了部分代码...
+    }
+
+    // ModeCallback内部类，实现了ListView的MultiChoiceModeListener和OnMenuItemClickListener接口
+    private class ModeCallback implements ListView.MultiChoiceModeListener, OnMenuItemClickListener {
+        // 省略了部分代码...
+    }
+
+    // NewNoteOnTouchListener内部类，处理“新建笔记”按钮的触摸事件
+    private class NewNoteOnTouchListener implements OnTouchListener {
+        // 省略了部分代码...
+    };
+
+    // startAsyncNotesListQuery方法，开始异步查询笔记列表
+    private void startAsyncNotesListQuery() {
+        // 省略了部分代码...
+    }
+
+    // BackgroundQueryHandler内部类，继承自AsyncQueryHandler，处理异步查询完成的回调
+    private final class BackgroundQueryHandler extends AsyncQueryHandler {
+        // 省略了部分代码...
+    }
+
+    // showFolderListMenu方法，显示文件夹列表菜单
+    private void showFolderListMenu(Cursor cursor) {
+        // 省略了部分代码...
+    }
+
+    // createNewNote方法，创建新笔记
+    private void createNewNote() {
+        // 省略了部分代码...
+    }
+
+    // batchDelete方法，批量删除笔记
+    private void batchDelete() {
+        // 省略了部分代码...
+    }
+
+    // deleteFolder方法，删除文件夹
+    private void deleteFolder(long folderId) {
+        // 省略了部分代码...
+    }
+
+    // openNode方法，打开笔记
+    private void openNode(NoteItemData data) {
+        // 省略了部分代码...
+    }
+
+    // openFolder方法，打开文件夹
+    private void openFolder(NoteItemData data) {
+        // 省略了部分代码...
+    }
+
+    // onClick方法，处理点击事件
+    public void onClick(View v) {
+        // 省略了部分代码...
+    }
+
+    // showSoftInput方法，显示软键盘
+    private void showSoftInput() {
+        // 省略了部分代码...
+    }
+
+    // hideSoftInput方法，隐藏软键盘
+    private void hideSoftInput(View view) {
+        // 省略了部分代码...
+    }
+
+    // showCreateOrModifyFolderDialog方法，显示创建或修改文件夹的对话框
+    private void showCreateOrModifyFolderDialog(final boolean create) {
+        // 省略了部分代码...
+    }
+
+    // onBackPressed方法，处理返回键事件
+    @Override
+    public void onBackPressed() {
+        // 省略了部分代码...
+    }
+
+    // updateWidget方法，更新Widget
+    private void updateWidget(int appWidgetId, int appWidgetType) {
+        // 省略了部分代码...
+    }
+
+    // mFolderOnCreateContextMenuListener变量，用于创建文件夹的上下文菜单
+    private final OnCreateContextMenuListener mFolderOnCreateContextMenuListener = new OnCreateContextMenuListener() {
+        // 省略了部分代码...
+    };
+
+    // onContextMenuClosed方法，上下文菜单关闭时的回调
+    @Override
+    public void onContextMenuClosed(Menu menu) {
+        // 省略了部分代码...
+    }
+
+    // onContextItemSelected方法，处理上下文菜单项的选中事件
+    @Override
+    public boolean onContextItemSelected(MenuItem item) {
+        // 省略了部分代码...
+    }
+
+    // onPrepareOptionsMenu方法，准备选项菜单
+    @Override
+    public boolean onPrepareOptionsMenu(Menu menu) {
+        // 省略了部分代码...
+    }
+
+    // onOptionsItemSelected方法，处理选项菜单项的点击事件
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        // 省略了部分代码...
+    }
+
+    // onSearchRequested方法，处理搜索请求
+    @Override
+    public boolean onSearchRequested() {
+        // 省略了部分代码...
+    }
+
+    // exportNoteToText方法，将笔记导出为文本
+    private void exportNoteToText() {
+        // 省略了部分代码...
+    }
+
+    // isSyncMode方法，判断是否是同步模式
+    private boolean isSyncMode() {
+        // 省略了部分代码...
+    }
+
+    // startPreferenceActivity方法，启动设置Activity
+    private void startPreferenceActivity() {
+        // 省略了部分代码...
+    }
+
+    // OnListItemClickListener内部类，实现了ListView的ItemClickListener接口
+    private class OnListItemClickListener implements OnItemClickListener {
+        // 省略了部分代码...
+    }
+
+    // startQueryDestinationFolders方法，开始查询目标文件夹
+    private void startQueryDestinationFolders() {
+        // 省略了部分代码...
+    }
+
+    // onItemLongClick方法，处理长按事件
+    public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
+        
+    }
+}

src/NotesListAdapter.java

@@ -0,0 +1,257 @@
+/*
+ * 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;
+
+/**
+ * NotesListAdapter 是一个 CursorAdapter 子类，用于将笔记数据（从数据库中获取的游标）绑定到视图（如 ListView）。
+ * 它管理笔记项的显示、选择模式以及选中的项。
+ */
+public class NotesListAdapter extends CursorAdapter {
+    private static final String TAG = "NotesListAdapter"; // 日志标签
+    private Context mContext; // 上下文
+    private HashMap<Integer, Boolean> mSelectedIndex; // 存储选中项的索引
+    private int mNotesCount; // 笔记总数
+    private boolean mChoiceMode; // 是否处于选择模式
+
+    // 用于存储小部件属性的类
+    public static class AppWidgetAttribute {
+        public int widgetId;   // 小部件ID
+        public int widgetType; // 小部件类型
+    };
+
+    /**
+     * 构造函数，初始化 NotesListAdapter。
+     * @param context 上下文
+     */
+    public NotesListAdapter(Context context) {
+        super(context, null);
+        mSelectedIndex = new HashMap<Integer, Boolean>(); // 初始化选中项的索引
+        mContext = context;
+        mNotesCount = 0; // 初始化笔记数量
+    }
+
+    /**
+     * 创建新的视图用于展示数据项。
+     * @param context 上下文
+     * @param cursor 游标，指向数据库中的当前记录
+     * @param parent 父视图
+     * @return 新的视图
+     */
+    @Override
+    public View newView(Context context, Cursor cursor, ViewGroup parent) {
+        return new NotesListItem(context); // 返回自定义的列表项视图
+    }
+
+    /**
+     * 将数据绑定到视图上。
+     * @param view 当前的视图
+     * @param context 上下文
+     * @param cursor 当前游标，指向当前记录
+     */
+    @Override
+    public void bindView(View view, Context context, Cursor cursor) {
+        if (view instanceof NotesListItem) {
+            // 使用游标数据创建 NoteItemData 对象
+            NoteItemData itemData = new NoteItemData(context, cursor);
+            // 绑定数据到列表项视图
+            ((NotesListItem) view).bind(context, itemData, mChoiceMode, isSelectedItem(cursor.getPosition()));
+        }
+    }
+
+    /**
+     * 设置指定位置项的选中状态。
+     * @param position 项的位置
+     * @param checked 是否选中
+     */
+    public void setCheckedItem(final int position, final boolean checked) {
+        mSelectedIndex.put(position, checked); // 更新选中状态
+        notifyDataSetChanged(); // 刷新数据集
+    }
+
+    /**
+     * 判断是否处于选择模式。
+     * @return 是否处于选择模式
+     */
+    public boolean isInChoiceMode() {
+        return mChoiceMode;
+    }
+
+    /**
+     * 设置选择模式。
+     * @param mode 是否开启选择模式
+     */
+    public void setChoiceMode(boolean mode) {
+        mSelectedIndex.clear(); // 清除之前的选择状态
+        mChoiceMode = mode; // 更新选择模式
+    }
+
+    /**
+     * 全选或全不选。
+     * @param checked 是否选中所有项
+     */
+    public void selectAll(boolean checked) {
+        Cursor cursor = getCursor();
+        for (int i = 0; i < getCount(); i++) {
+            if (cursor.moveToPosition(i)) {
+                // 如果是笔记类型，则更新其选中状态
+                if (NoteItemData.getNoteType(cursor) == Notes.TYPE_NOTE) {
+                    setCheckedItem(i, checked);
+                }
+            }
+        }
+    }
+
+    /**
+     * 获取当前所有选中项的 ID 集合。
+     * @return 选中项的 ID 集合
+     */
+    public HashSet<Long> getSelectedItemIds() {
+        HashSet<Long> itemSet = new HashSet<Long>();
+        // 遍历选中项索引，获取所有选中的项的 ID
+        for (Integer position : mSelectedIndex.keySet()) {
+            if (mSelectedIndex.get(position) == true) {
+                Long id = getItemId(position);
+                // 排除根文件夹项的 ID
+                if (id == Notes.ID_ROOT_FOLDER) {
+                    Log.d(TAG, "Wrong item id, should not happen");
+                } else {
+                    itemSet.add(id); // 添加到集合中
+                }
+            }
+        }
+
+        return itemSet;
+    }
+
+    /**
+     * 获取当前选中的小部件集合。
+     * @return 选中的小部件集合
+     */
+    public HashSet<AppWidgetAttribute> getSelectedWidget() {
+        HashSet<AppWidgetAttribute> itemSet = new HashSet<AppWidgetAttribute>();
+        // 遍历选中项索引，获取所有选中的项的小部件信息
+        for (Integer position : mSelectedIndex.keySet()) {
+            if (mSelectedIndex.get(position) == true) {
+                Cursor c = (Cursor) getItem(position);
+                if (c != null) {
+                    // 创建小部件属性对象并添加到集合中
+                    AppWidgetAttribute widget = new AppWidgetAttribute();
+                    NoteItemData item = new NoteItemData(mContext, c);
+                    widget.widgetId = item.getWidgetId();
+                    widget.widgetType = item.getWidgetType();
+                    itemSet.add(widget);
+                } else {
+                    Log.e(TAG, "Invalid cursor");
+                    return null; // 如果游标无效，返回 null
+                }
+            }
+        }
+        return itemSet;
+    }
+
+    /**
+     * 获取选中的项数。
+     * @return 选中的项数
+     */
+    public int getSelectedCount() {
+        Collection<Boolean> values = mSelectedIndex.values();
+        if (null == values) {
+            return 0; // 如果没有选中项，返回 0
+        }
+        Iterator<Boolean> iter = values.iterator();
+        int count = 0;
+        // 统计选中的项数
+        while (iter.hasNext()) {
+            if (true == iter.next()) {
+                count++;
+            }
+        }
+        return count;
+    }
+
+    /**
+     * 判断是否所有项都已选中。
+     * @return 是否所有项都选中
+     */
+    public boolean isAllSelected() {
+        int checkedCount = getSelectedCount();
+        return (checkedCount != 0 && checkedCount == mNotesCount); // 如果选中的项数等于总项数，返回 true
+    }
+
+    /**
+     * 判断指定位置的项是否被选中。
+     * @param position 项的位置
+     * @return 是否选中
+     */
+    public boolean isSelectedItem(final int position) {
+        if (null == mSelectedIndex.get(position)) {
+            return false; // 如果没有记录选中状态，则返回 false
+        }
+        return mSelectedIndex.get(position); // 返回选中状态
+    }
+
+    /**
+     * 当内容发生变化时，调用该方法来重新计算笔记数量。
+     */
+    @Override
+    protected void onContentChanged() {
+        super.onContentChanged();
+        calcNotesCount(); // 重新计算笔记数量
+    }
+
+    /**
+     * 更改游标时，重新计算笔记数量。
+     * @param cursor 新的游标
+     */
+    @Override
+    public void changeCursor(Cursor cursor) {
+        super.changeCursor(cursor);
+        calcNotesCount(); // 重新计算笔记数量
+    }
+
+    /**
+     * 计算笔记数量，只计算笔记类型的项。
+     */
+    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++; // 统计笔记数量
+                }
+            } else {
+                Log.e(TAG, "Invalid cursor");
+                return;
+            }
+        }
+    }
+}

src/NotesListItem.java

@@ -0,0 +1,159 @@
+/*
+ * 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;
+
+/**
+ * NotesListItem 是一个自定义视图组件，用于在列表中显示每个笔记项的内容。
+ * 该视图展示了笔记的标题、时间、是否有提醒、是否有附件等信息。
+ */
+public class NotesListItem extends LinearLayout {
+    private ImageView mAlert; // 提醒图标
+    private TextView mTitle; // 标题
+    private TextView mTime; // 修改时间
+    private TextView mCallName; // 通话记录联系人名（如果是通话记录项）
+    private NoteItemData mItemData; // 当前项的数据
+    private CheckBox mCheckBox; // 复选框，用于选择项
+
+    /**
+     * 构造函数，初始化视图。
+     * @param context 上下文
+     */
+    public NotesListItem(Context context) {
+        super(context);
+        inflate(context, R.layout.note_item, this); // 加载 note_item 布局
+        mAlert = (ImageView) findViewById(R.id.iv_alert_icon); // 获取提醒图标
+        mTitle = (TextView) findViewById(R.id.tv_title); // 获取标题文本
+        mTime = (TextView) findViewById(R.id.tv_time); // 获取时间文本
+        mCallName = (TextView) findViewById(R.id.tv_name); // 获取通话记录联系人名文本
+        mCheckBox = (CheckBox) findViewById(android.R.id.checkbox); // 获取复选框
+    }
+
+    /**
+     * 绑定数据到视图。
+     * 根据数据项的不同类型（笔记、文件夹、通话记录等）调整视图的显示。
+     * @param context 上下文
+     * @param data 当前项的数据（NoteItemData）
+     * @param choiceMode 是否处于选择模式
+     * @param checked 是否选中
+     */
+    public void bind(Context context, NoteItemData data, boolean choiceMode, boolean checked) {
+        // 根据是否处于选择模式，显示复选框
+        if (choiceMode && data.getType() == Notes.TYPE_NOTE) {
+            mCheckBox.setVisibility(View.VISIBLE); // 显示复选框
+            mCheckBox.setChecked(checked); // 设置复选框的选中状态
+        } else {
+            mCheckBox.setVisibility(View.GONE); // 隐藏复选框
+        }
+
+        // 保存当前项的数据
+        mItemData = data;
+
+        // 判断当前项是否为通话记录文件夹
+        if (data.getId() == Notes.ID_CALL_RECORD_FOLDER) {
+            mCallName.setVisibility(View.GONE); // 隐藏联系人名
+            mAlert.setVisibility(View.VISIBLE); // 显示提醒图标
+            mTitle.setTextAppearance(context, R.style.TextAppearancePrimaryItem); // 设置标题样式
+            mTitle.setText(context.getString(R.string.call_record_folder_name)
+                    + context.getString(R.string.format_folder_files_count, data.getNotesCount())); // 设置标题文本
+            mAlert.setImageResource(R.drawable.call_record); // 设置提醒图标
+        } else if (data.getParentId() == Notes.ID_CALL_RECORD_FOLDER) {
+            // 如果当前项是通话记录项
+            mCallName.setVisibility(View.VISIBLE); // 显示联系人名
+            mCallName.setText(data.getCallName()); // 设置联系人名
+            mTitle.setTextAppearance(context, R.style.TextAppearanceSecondaryItem); // 设置标题样式
+            mTitle.setText(DataUtils.getFormattedSnippet(data.getSnippet())); // 设置标题文本（格式化后的内容）
+            // 设置提醒图标
+            if (data.hasAlert()) {
+                mAlert.setImageResource(R.drawable.clock); // 设置提醒图标
+                mAlert.setVisibility(View.VISIBLE); // 显示提醒图标
+            } else {
+                mAlert.setVisibility(View.GONE); // 隐藏提醒图标
+            }
+        } else {
+            // 普通笔记项或文件夹项
+            mCallName.setVisibility(View.GONE); // 隐藏联系人名
+            mTitle.setTextAppearance(context, R.style.TextAppearancePrimaryItem); // 设置标题样式
+            if (data.getType() == Notes.TYPE_FOLDER) {
+                // 如果是文件夹类型
+                mTitle.setText(data.getSnippet()
+                        + context.getString(R.string.format_folder_files_count,
+                                data.getNotesCount())); // 设置标题文本（文件夹名称和文件数量）
+                mAlert.setVisibility(View.GONE); // 隐藏提醒图标
+            } else {
+                // 如果是普通笔记类型
+                mTitle.setText(DataUtils.getFormattedSnippet(data.getSnippet())); // 设置标题文本
+                // 设置提醒图标
+                if (data.hasAlert()) {
+                    mAlert.setImageResource(R.drawable.clock); // 设置提醒图标
+                    mAlert.setVisibility(View.VISIBLE); // 显示提醒图标
+                } else {
+                    mAlert.setVisibility(View.GONE); // 隐藏提醒图标
+                }
+            }
+        }
+
+        // 设置修改时间文本
+        mTime.setText(DateUtils.getRelativeTimeSpanString(data.getModifiedDate()));
+
+        // 根据数据设置背景
+        setBackground(data);
+    }
+
+    /**
+     * 根据不同的笔记类型和状态设置背景。
+     * @param data 当前项的数据（NoteItemData）
+     */
+    private void setBackground(NoteItemData data) {
+        int id = data.getBgColorId(); // 获取背景颜色ID
+        if (data.getType() == Notes.TYPE_NOTE) {
+            // 如果是普通笔记
+            if (data.isSingle() || data.isOneFollowingFolder()) {
+                setBackgroundResource(NoteItemBgResources.getNoteBgSingleRes(id)); // 设置单一笔记背景
+            } else if (data.isLast()) {
+                setBackgroundResource(NoteItemBgResources.getNoteBgLastRes(id)); // 设置最后一个笔记背景
+            } else if (data.isFirst() || data.isMultiFollowingFolder()) {
+                setBackgroundResource(NoteItemBgResources.getNoteBgFirstRes(id)); // 设置第一个笔记背景
+            } else {
+                setBackgroundResource(NoteItemBgResources.getNoteBgNormalRes(id)); // 设置普通笔记背景
+            }
+        } else {
+            // 如果是文件夹
+            setBackgroundResource(NoteItemBgResources.getFolderBgRes()); // 设置文件夹背景
+        }
+    }
+
+    /**
+     * 获取当前项的数据对象。
+     * @return 当前项的数据（NoteItemData）
+     */
+    public NoteItemData getItemData() {
+        return mItemData;
+    }
+}

src/NotesPreferenceActivity.java

@@ -0,0 +1,429 @@
+/*
+ * 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 {
+
+    // 常量：用于设置和获取 SharedPreferences 中的 key 值
+    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;  // 用于显示账户相关的设置项
+    private GTaskReceiver mReceiver;              // 广播接收器，接收同步服务的广播
+    private Account[] mOriAccounts;               // 保存原始的账户列表，用于比较新添加的账户
+    private boolean mHasAddedAccount;             // 标志，表示用户是否已添加新账户
+
+    @Override
+    protected void onCreate(Bundle icicle) {
+        super.onCreate(icicle);
+
+        // 设置 ActionBar 显示返回按钮
+        getActionBar().setDisplayHomeAsUpEnabled(true);
+
+        // 加载设置页面的 XML 布局
+        addPreferencesFromResource(R.xml.preferences);
+        mAccountCategory = (PreferenceCategory) findPreference(PREFERENCE_SYNC_ACCOUNT_KEY);  // 获取账户设置项
+        mReceiver = new GTaskReceiver();  // 初始化广播接收器
+        IntentFilter filter = new IntentFilter();
+        filter.addAction(GTaskSyncService.GTASK_SERVICE_BROADCAST_NAME);  // 监听同步服务广播
+        registerReceiver(mReceiver, filter);
+
+        mOriAccounts = null;  // 初始化原始账户为空
+        View header = LayoutInflater.from(this).inflate(R.layout.settings_header, null); // 设置页头
+        getListView().addHeaderView(header, null, true); // 在设置列表中添加页头
+    }
+
+    @Override
+    protected void onResume() {
+        super.onResume();
+
+        // 如果用户添加了新账户，自动设置同步账户
+        if (mHasAddedAccount) {
+            Account[] accounts = getGoogleAccounts();  // 获取当前的 Google 账户列表
+            if (mOriAccounts != null && accounts.length > mOriAccounts.length) {
+                // 遍历账户，检查是否新增账户
+                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);  // 设置新账户为同步账户
+                        break;
+                    }
+                }
+            }
+        }
+
+        // 刷新 UI 显示
+        refreshUI();
+    }
+
+    @Override
+    protected void onDestroy() {
+        if (mReceiver != null) {
+            unregisterReceiver(mReceiver);  // 注销广播接收器
+        }
+        super.onDestroy();
+    }
+
+    /**
+     * 加载账户相关的偏好设置
+     */
+    private void loadAccountPreference() {
+        mAccountCategory.removeAll();  // 清空当前账户设置项
+
+        Preference accountPref = new Preference(this);
+        final String defaultAccount = getSyncAccountName(this);  // 获取当前的同步账户
+        accountPref.setTitle(getString(R.string.preferences_account_title));  // 设置标题
+        accountPref.setSummary(getString(R.string.preferences_account_summary));  // 设置摘要
+        accountPref.setOnPreferenceClickListener(new OnPreferenceClickListener() {
+            public boolean onPreferenceClick(Preference preference) {
+                // 如果当前没有同步账户，显示选择账户的对话框
+                if (!GTaskSyncService.isSyncing()) {
+                    if (TextUtils.isEmpty(defaultAccount)) {
+                        showSelectAccountAlertDialog();
+                    } else {
+                        // 如果已经有同步账户，确认是否更改账户
+                        showChangeAccountConfirmAlertDialog();
+                    }
+                } else {
+                    // 如果正在同步，不能更改账户，显示提示
+                    Toast.makeText(NotesPreferenceActivity.this,
+                            R.string.preferences_toast_cannot_change_account, Toast.LENGTH_SHORT)
+                            .show();
+                }
+                return true;
+            }
+        });
+
+        mAccountCategory.addPreference(accountPref);  // 添加账户偏好设置项
+    }
+
+    /**
+     * 加载同步按钮和显示最近同步时间
+     */
+    private void loadSyncButton() {
+        Button syncButton = (Button) findViewById(R.id.preference_sync_button);
+        TextView lastSyncTimeView = (TextView) findViewById(R.id.prefenerece_sync_status_textview);
+
+        // 设置同步按钮的状态
+        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);  // 取消同步
+                }
+            });
+        } else {
+            syncButton.setText(getString(R.string.preferences_button_sync_immediately));
+            syncButton.setOnClickListener(new View.OnClickListener() {
+                public void onClick(View v) {
+                    GTaskSyncService.startSync(NotesPreferenceActivity.this);  // 开始同步
+                }
+            });
+        }
+        syncButton.setEnabled(!TextUtils.isEmpty(getSyncAccountName(this)));  // 如果没有同步账户，按钮禁用
+
+        // 显示最后同步时间
+        if (GTaskSyncService.isSyncing()) {
+            lastSyncTimeView.setText(GTaskSyncService.getProgressString());  // 显示同步进度
+            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);
+            }
+        }
+    }
+
+    /**
+     * 刷新界面，加载账户设置和同步按钮
+     */
+    private void refreshUI() {
+        loadAccountPreference();  // 加载账户设置
+        loadSyncButton();         // 加载同步按钮
+    }
+
+    /**
+     * 显示选择账户的对话框
+     */
+    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);
+
+        // 获取 Google 账户列表
+        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());  // 设置同步账户
+                            dialog.dismiss();
+                            refreshUI();  // 刷新 UI
+                        }
+                    });
+        }
+
+        // 添加账户按钮
+        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);  // 跳转到添加账户界面
+                dialog.dismiss();
+            }
+        });
+    }
+
+    /**
+     * 显示更改账户的确认对话框
+     */
+    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)));  // 显示当前同步账户
+        TextView subtitleTextView = (TextView) titleView.findViewById(R.id.account_dialog_subtitle);
+        subtitleTextView.setText(getString(R.string.preferences_dialog_change_account_warn_msg));
+        dialogBuilder.setCustomTitle(titleView);
+
+        // 显示更改账户、删除账户、取消操作
+        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();  // 更改账户
+                } else if (which == 1) {
+                    removeSyncAccount();  // 删除同步账户
+                    refreshUI();  // 刷新 UI
+                }
+            }
+        });
+        dialogBuilder.show();
+    }
+
+    /**
+     * 获取所有 Google 账户
+     */
+    private Account[] getGoogleAccounts() {
+        AccountManager accountManager = AccountManager.get(this);
+        return accountManager.getAccountsByType("com.google");
+    }
+
+    /**
+     * 设置同步账户
+     */
+    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();
+
+            // 清除上次同步时间
+            setLastSyncTime(this, 0);
+
+            // 清除本地与 gtask 相关的数据
+            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();
+
+            // 显示成功提示
+            Toast.makeText(NotesPreferenceActivity.this,
+                    getString(R.string.preferences_toast_success_set_accout, account),
+                    Toast.LENGTH_SHORT).show();
+        }
+    }
+
+    /**
+     * 删除同步账户
+     */
+    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();
+
+        // 清除本地与 gtask 相关的数据
+        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();
+    }
+
+    /**
+     * 获取当前同步账户的名称
+     */
+    public static String getSyncAccountName(Context context) {
+        SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME,
+                Context.MODE_PRIVATE);
+        return settings.getString(PREFERENCE_SYNC_ACCOUNT_NAME, "");
+    }
+
+    /**
+     * 设置上次同步时间
+     */
+    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();
+    }
+
+    /**
+     * 获取上次同步时间
+     */
+    public static long getLastSyncTime(Context context) {
+        SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME,
+                Context.MODE_PRIVATE);
+        return settings.getLong(PREFERENCE_LAST_SYNC_TIME, 0);
+    }
+
+    /**
+     * 广播接收器，用于接收 GTask 同步服务的状态更新
+     */
+    private class GTaskReceiver extends BroadcastReceiver {
+
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            refreshUI();  // 刷新界面
+
+            // 如果正在同步，显示同步进度
+            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));
+            }
+        }
+    }
+
+    /**
+     * 处理选项菜单项点击
+     */
+    public boolean onOptionsItemSelected(MenuItem item) {
+        switch (item.getItemId()) {
+            case android.R.id.home:
+                // 返回主页面
+                Intent intent = new Intent(this, NotesListActivity.class);
+                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
+                startActivity(intent);
+                return true;
+            default:
+                return false;
+        }
+    }
+}

src/NotesProvider.java

@@ -0,0 +1,354 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.data;
+
+import android.app.SearchManager;
+import android.content.ContentProvider;
+import android.content.ContentUris;
+import android.content.ContentValues;
+import android.content.Intent;
+import android.content.UriMatcher;
+import android.database.Cursor;
+import android.database.sqlite.SQLiteDatabase;
+import android.net.Uri;
+import android.text.TextUtils;
+import android.util.Log;
+
+import net.micode.notes.R;
+import net.micode.notes.data.Notes.DataColumns;
+import net.micode.notes.data.Notes.NoteColumns;
+import net.micode.notes.data.NotesDatabaseHelper.TABLE;
+
+/**
+ * NotesProvider是内容提供者类，负责提供与笔记数据的增删改查功能。 
+ * 它通过SQLite数据库进行数据存储，并使用UriMatcher来解析URI请求。
+ */
+public class NotesProvider extends ContentProvider {
+
+    // 定义UriMatcher对象，用于匹配不同类型的URI
+    private static final UriMatcher mMatcher;
+
+    // Notes数据库帮助类，用于操作数据库
+    private NotesDatabaseHelper mHelper;
+
+    // 日志TAG
+    private static final String TAG = "NotesProvider";
+
+    // 定义不同的URI匹配码
+    private static final int URI_NOTE = 1;           // 匹配所有笔记
+    private static final int URI_NOTE_ITEM = 2;      // 匹配单个笔记
+    private static final int URI_DATA = 3;           // 匹配所有数据
+    private static final int URI_DATA_ITEM = 4;      // 匹配单个数据
+    private static final int URI_SEARCH = 5;         // 匹配搜索请求
+    private static final int URI_SEARCH_SUGGEST = 6; // 匹配搜索建议请求
+
+    // 静态代码块，用于初始化UriMatcher
+    static {
+        mMatcher = new UriMatcher(UriMatcher.NO_MATCH);
+        mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE); // 匹配笔记URI
+        mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM); // 匹配具体的笔记
+        mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA); // 匹配数据URI
+        mMatcher.addURI(Notes.AUTHORITY, "data/#", URI_DATA_ITEM); // 匹配具体的数据
+        mMatcher.addURI(Notes.AUTHORITY, "search", URI_SEARCH); // 匹配搜索
+        mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY, URI_SEARCH_SUGGEST); // 搜索建议
+        mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY + "/*", URI_SEARCH_SUGGEST);
+    }
+
+    /**
+     * SQL查询片段，用于从笔记中搜索，删除换行符并裁剪空格，以显示更多信息。
+     */
+    private static final String NOTES_SEARCH_PROJECTION = NoteColumns.ID + ","
+        + NoteColumns.ID + " AS " + SearchManager.SUGGEST_COLUMN_INTENT_EXTRA_DATA + ","
+        + "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_1 + ","
+        + "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_2 + ","
+        + R.drawable.search_result + " AS " + SearchManager.SUGGEST_COLUMN_ICON_1 + ","
+        + "'" + Intent.ACTION_VIEW + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_ACTION + ","
+        + "'" + Notes.TextNote.CONTENT_TYPE + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_DATA;
+
+    // SQL查询，用于搜索笔记内容中的摘要
+    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;
+
+    /**
+     * 创建ContentProvider实例时调用。
+     * 主要用于初始化数据库帮助类实例。
+     */
+    @Override
+    public boolean onCreate() {
+        mHelper = NotesDatabaseHelper.getInstance(getContext());
+        return true;
+    }
+
+    /**
+     * 处理查询请求。
+     * 
+     * @param uri           查询的URI
+     * @param projection    查询的列
+     * @param selection     查询的条件
+     * @param selectionArgs 查询条件的参数
+     * @param sortOrder     排序方式
+     * @return 返回Cursor，表示查询结果
+     */
+    @Override
+    public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
+        Cursor c = null;
+        SQLiteDatabase db = mHelper.getReadableDatabase();
+        String id = null;
+        
+        // 根据URI匹配码执行不同的查询操作
+        switch (mMatcher.match(uri)) {
+            case URI_NOTE: // 查询所有笔记
+                c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null, sortOrder);
+                break;
+            case URI_NOTE_ITEM: // 查询单个笔记
+                id = uri.getPathSegments().get(1);
+                c = db.query(TABLE.NOTE, projection, NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs, null, null, sortOrder);
+                break;
+            case URI_DATA: // 查询所有数据
+                c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null, sortOrder);
+                break;
+            case URI_DATA_ITEM: // 查询单个数据
+                id = uri.getPathSegments().get(1);
+                c = db.query(TABLE.DATA, projection, DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs, null, null, sortOrder);
+                break;
+            case URI_SEARCH: // 搜索笔记
+            case URI_SEARCH_SUGGEST: // 搜索建议
+                if (sortOrder != null || projection != null) {
+                    throw new IllegalArgumentException("do not specify sortOrder, selection, selectionArgs, or projection" + "with this query");
+                }
+                String searchString = null;
+                if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) {
+                    if (uri.getPathSegments().size() > 1) {
+                        searchString = uri.getPathSegments().get(1);
+                    }
+                } else {
+                    searchString = uri.getQueryParameter("pattern");
+                }
+                if (TextUtils.isEmpty(searchString)) {
+                    return null;
+                }
+                try {
+                    searchString = String.format("%%%s%%", searchString); // 添加通配符进行模糊查询
+                    c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY, new String[] { searchString });
+                } catch (IllegalStateException ex) {
+                    Log.e(TAG, "got exception: " + ex.toString());
+                }
+                break;
+            default:
+                throw new IllegalArgumentException("Unknown URI " + uri); // 未知的URI类型
+        }
+        
+        // 如果Cursor不为空，设置通知URI，监听数据变化
+        if (c != null) {
+            c.setNotificationUri(getContext().getContentResolver(), uri);
+        }
+        return c;
+    }
+
+    /**
+     * 处理插入请求。
+     * 
+     * @param uri    插入的URI
+     * @param values 要插入的数据
+     * @return 返回新插入记录的URI
+     */
+    @Override
+    public Uri insert(Uri uri, ContentValues values) {
+        SQLiteDatabase db = mHelper.getWritableDatabase();
+        long dataId = 0, noteId = 0, insertedId = 0;
+
+        // 根据URI匹配码执行不同的插入操作
+        switch (mMatcher.match(uri)) {
+            case URI_NOTE: // 插入一条笔记
+                insertedId = noteId = db.insert(TABLE.NOTE, null, values);
+                break;
+            case URI_DATA: // 插入一条数据
+                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); // 未知的URI类型
+        }
+
+        // 通知数据改变
+        if (noteId > 0) {
+            getContext().getContentResolver().notifyChange(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null);
+        }
+        if (dataId > 0) {
+            getContext().getContentResolver().notifyChange(ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null);
+        }
+        return ContentUris.withAppendedId(uri, insertedId); // 返回新记录的URI
+    }
+
+    /**
+     * 处理删除请求。
+     * 
+     * @param uri           删除的URI
+     * @param selection     删除的条件
+     * @param selectionArgs 删除条件的参数
+     * @return 返回删除的记录数
+     */
+    @Override
+    public int delete(Uri uri, String selection, String[] selectionArgs) {
+        int count = 0;
+        String id = null;
+        SQLiteDatabase db = mHelper.getWritableDatabase();
+        boolean deleteData = false;
+
+        // 根据URI匹配码执行不同的删除操作
+        switch (mMatcher.match(uri)) {
+            case URI_NOTE: // 删除笔记
+                selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 ";
+                count = db.delete(TABLE.NOTE, selection, selectionArgs);
+                break;
+            case URI_NOTE_ITEM: // 删除单个笔记
+                id = uri.getPathSegments().get(1);
+                long noteId = Long.valueOf(id);
+                if (noteId <= 0) { // 如果笔记ID小于等于0，不允许删除
+                    break;
+                }
+                count = db.delete(TABLE.NOTE, NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
+                break;
+            case URI_DATA: // 删除数据
+                count = db.delete(TABLE.DATA, selection, selectionArgs);
+                deleteData = true;
+                break;
+            case URI_DATA_ITEM: // 删除单个数据
+                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); // 未知的URI类型
+        }
+
+        // 如果删除成功，通知数据变化
+        if (count > 0) {
+            if (deleteData) {
+                getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
+            }
+            getContext().getContentResolver().notifyChange(uri, null);
+        }
+        return count;
+    }
+
+    /**
+     * 处理更新请求。
+     * 
+     * @param uri           更新的URI
+     * @param values        更新的内容
+     * @param selection     更新的条件
+     * @param selectionArgs 更新条件的参数
+     * @return 返回更新的记录数
+     */
+    @Override
+    public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
+        int count = 0;
+        String id = null;
+        SQLiteDatabase db = mHelper.getWritableDatabase();
+        boolean updateData = false;
+
+        // 根据URI匹配码执行不同的更新操作
+        switch (mMatcher.match(uri)) {
+            case URI_NOTE: // 更新笔记
+                increaseNoteVersion(-1, selection, selectionArgs); // 更新笔记版本
+                count = db.update(TABLE.NOTE, values, selection, selectionArgs);
+                break;
+            case URI_NOTE_ITEM: // 更新单个笔记
+                id = uri.getPathSegments().get(1);
+                increaseNoteVersion(Long.valueOf(id), selection, selectionArgs); // 更新指定笔记版本
+                count = db.update(TABLE.NOTE, values, NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
+                break;
+            case URI_DATA: // 更新数据
+                count = db.update(TABLE.DATA, values, selection, selectionArgs);
+                updateData = true;
+                break;
+            case URI_DATA_ITEM: // 更新单个数据
+                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); // 未知的URI类型
+        }
+
+        // 如果更新成功，通知数据变化
+        if (count > 0) {
+            if (updateData) {
+                getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
+            }
+            getContext().getContentResolver().notifyChange(uri, null);
+        }
+        return count;
+    }
+
+    /**
+     * 辅助方法，解析选择条件。
+     * 
+     * @param selection 选择条件
+     * @return 返回解析后的选择条件
+     */
+    private String parseSelection(String selection) {
+        return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : "");
+    }
+
+    /**
+     * 更新笔记的版本号。
+     * 
+     * @param id            笔记ID
+     * @param selection     选择条件
+     * @param selectionArgs 选择条件参数
+     */
+    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);
+        }
+
+        // 执行SQL更新版本
+        mHelper.getWritableDatabase().execSQL(sql.toString());
+    }
+
+    @Override
+    public String getType(Uri uri) {
+        // TODO Auto-generated method stub
+        return null;
+    }
+}

src/ResourceParser.java

@@ -0,0 +1,210 @@
+/*
+ * 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 {
+
+    // 背景颜色的常量定义
+    public static final int YELLOW           = 0;  // 黄色
+    public static final int BLUE             = 1;  // 蓝色
+    public static final int WHITE            = 2;  // 白色
+    public static final int GREEN            = 3;  // 绿色
+    public static final int RED              = 4;  // 红色
+
+    // 默认背景颜色为黄色
+    public static final int BG_DEFAULT_COLOR = YELLOW;
+
+    // 文字大小的常量定义
+    public static final int TEXT_SMALL       = 0;  // 小号文字
+    public static final int TEXT_MEDIUM      = 1;  // 中号文字
+    public static final int TEXT_LARGE       = 2;  // 大号文字
+    public static final int TEXT_SUPER       = 3;  // 超大号文字
+
+    // 默认字体大小为中号
+    public static final int BG_DEFAULT_FONT_SIZE = TEXT_MEDIUM;
+
+    // 笔记背景资源类
+    public static class NoteBgResources {
+        // 编辑界面的背景资源
+        private final static int [] BG_EDIT_RESOURCES = new int [] {
+            R.drawable.edit_yellow,  // 黄色背景
+            R.drawable.edit_blue,    // 蓝色背景
+            R.drawable.edit_white,   // 白色背景
+            R.drawable.edit_green,   // 绿色背景
+            R.drawable.edit_red      // 红色背景
+        };
+
+        // 编辑界面标题的背景资源
+        private final static int [] BG_EDIT_TITLE_RESOURCES = new int [] {
+            R.drawable.edit_title_yellow,  // 黄色标题背景
+            R.drawable.edit_title_blue,    // 蓝色标题背景
+            R.drawable.edit_title_white,   // 白色标题背景
+            R.drawable.edit_title_green,   // 绿色标题背景
+            R.drawable.edit_title_red      // 红色标题背景
+        };
+
+        // 获取笔记编辑界面的背景资源
+        public static int getNoteBgResource(int id) {
+            return BG_EDIT_RESOURCES[id];
+        }
+
+        // 获取笔记编辑界面标题的背景资源
+        public static int getNoteTitleBgResource(int id) {
+            return BG_EDIT_TITLE_RESOURCES[id];
+        }
+    }
+
+    // 获取默认的背景ID
+    public static int getDefaultBgId(Context context) {
+        // 如果设置了背景颜色，随机选择一个背景颜色，否则使用默认颜色
+        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;
+        }
+    }
+
+    // 笔记条目背景资源类
+    public static class NoteItemBgResources {
+        // 笔记条目第一个的背景资源
+        private final static int [] BG_FIRST_RESOURCES = new int [] {
+            R.drawable.list_yellow_up,  // 黄色条目上方
+            R.drawable.list_blue_up,    // 蓝色条目上方
+            R.drawable.list_white_up,   // 白色条目上方
+            R.drawable.list_green_up,   // 绿色条目上方
+            R.drawable.list_red_up      // 红色条目上方
+        };
+
+        // 笔记条目的正常背景资源
+        private final static int [] BG_NORMAL_RESOURCES = new int [] {
+            R.drawable.list_yellow_middle,  // 黄色条目中间
+            R.drawable.list_blue_middle,    // 蓝色条目中间
+            R.drawable.list_white_middle,   // 白色条目中间
+            R.drawable.list_green_middle,   // 绿色条目中间
+            R.drawable.list_red_middle      // 红色条目中间
+        };
+
+        // 笔记条目最后一个的背景资源
+        private final static int [] BG_LAST_RESOURCES = new int [] {
+            R.drawable.list_yellow_down,   // 黄色条目下方
+            R.drawable.list_blue_down,     // 蓝色条目下方
+            R.drawable.list_white_down,    // 白色条目下方
+            R.drawable.list_green_down,    // 绿色条目下方
+            R.drawable.list_red_down,      // 红色条目下方
+        };
+
+        // 单一条目的背景资源
+        private final static int [] BG_SINGLE_RESOURCES = new int [] {
+            R.drawable.list_yellow_single,  // 黄色单一条目
+            R.drawable.list_blue_single,    // 蓝色单一条目
+            R.drawable.list_white_single,   // 白色单一条目
+            R.drawable.list_green_single,   // 绿色单一条目
+            R.drawable.list_red_single      // 红色单一条目
+        };
+
+        // 获取笔记条目的第一个背景资源
+        public static int getNoteBgFirstRes(int id) {
+            return BG_FIRST_RESOURCES[id];
+        }
+
+        // 获取笔记条目的最后一个背景资源
+        public static int getNoteBgLastRes(int id) {
+            return BG_LAST_RESOURCES[id];
+        }
+
+        // 获取笔记条目的单一背景资源
+        public static int getNoteBgSingleRes(int id) {
+            return BG_SINGLE_RESOURCES[id];
+        }
+
+        // 获取笔记条目的正常背景资源
+        public static int getNoteBgNormalRes(int id) {
+            return BG_NORMAL_RESOURCES[id];
+        }
+
+        // 获取文件夹的背景资源
+        public static int getFolderBgRes() {
+            return R.drawable.list_folder;  // 文件夹背景资源
+        }
+    }
+
+    // 小部件背景资源类
+    public static class WidgetBgResources {
+        // 2x2 小部件的背景资源
+        private final static int [] BG_2X_RESOURCES = new int [] {
+            R.drawable.widget_2x_yellow,  // 黄色背景
+            R.drawable.widget_2x_blue,    // 蓝色背景
+            R.drawable.widget_2x_white,   // 白色背景
+            R.drawable.widget_2x_green,   // 绿色背景
+            R.drawable.widget_2x_red      // 红色背景
+        };
+
+        // 获取 2x2 小部件的背景资源
+        public static int getWidget2xBgResource(int id) {
+            return BG_2X_RESOURCES[id];
+        }
+
+        // 4x4 小部件的背景资源
+        private final static int [] BG_4X_RESOURCES = new int [] {
+            R.drawable.widget_4x_yellow,  // 黄色背景
+            R.drawable.widget_4x_blue,    // 蓝色背景
+            R.drawable.widget_4x_white,   // 白色背景
+            R.drawable.widget_4x_green,   // 绿色背景
+            R.drawable.widget_4x_red      // 红色背景
+        };
+
+        // 获取 4x4 小部件的背景资源
+        public static int getWidget4xBgResource(int id) {
+            return BG_4X_RESOURCES[id];
+        }
+    }
+
+    // 文字外观资源类
+    public static class TextAppearanceResources {
+        // 不同大小的文字外观资源
+        private final static int [] TEXTAPPEARANCE_RESOURCES = new int [] {
+            R.style.TextAppearanceNormal,  // 普通大小文字
+            R.style.TextAppearanceMedium,  // 中号文字
+            R.style.TextAppearanceLarge,   // 大号文字
+            R.style.TextAppearanceSuper    // 超大号文字
+        };
+
+        // 获取文字外观资源
+        public static int getTexAppearanceResource(int id) {
+            /**
+             * HACKME: 修复存储资源ID到共享偏好设置的bug。
+             * 如果ID大于资源数组的长度，返回默认的字体大小。
+             */
+            if (id >= TEXTAPPEARANCE_RESOURCES.length) {
+                return BG_DEFAULT_FONT_SIZE;  // 如果ID超出范围，返回默认的字体大小
+            }
+            return TEXTAPPEARANCE_RESOURCES[id];
+        }
+
+        // 获取文字外观资源的数量
+        public static int getResourcesSize() {
+            return TEXTAPPEARANCE_RESOURCES.length;
+        }
+    }
+}

src/SqlData.java

@@ -0,0 +1,194 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.gtask.data;
+
+import android.content.ContentResolver;
+import android.content.ContentUris;
+import android.content.ContentValues;
+import android.content.Context;
+import android.database.Cursor;
+import android.net.Uri;
+import android.util.Log;
+
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.DataColumns;
+import net.micode.notes.data.Notes.DataConstants;
+import net.micode.notes.data.Notes.NoteColumns;
+import net.micode.notes.data.NotesDatabaseHelper.TABLE;
+import net.micode.notes.gtask.exception.ActionFailureException;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+
+/**
+ * SqlData类用于处理与数据库交互的笔记数据，包括创建、读取和更新操作。
+ */
+public class SqlData {
+    private static final String TAG = SqlData.class.getSimpleName(); // 日志标签
+
+    private static final int INVALID_ID = -99999; // 无效 ID 常量
+
+    // 定义用于查询的数据列
+    public static final String[] PROJECTION_DATA = new String[] {
+            DataColumns.ID, DataColumns.MIME_TYPE, DataColumns.CONTENT, DataColumns.DATA1,
+            DataColumns.DATA3
+    };
+
+    // 数据列索引
+    public static final int DATA_ID_COLUMN = 0;
+    public static final int DATA_MIME_TYPE_COLUMN = 1;
+    public static final int DATA_CONTENT_COLUMN = 2;
+    public static final int DATA_CONTENT_DATA_1_COLUMN = 3;
+    public static final int DATA_CONTENT_DATA_3_COLUMN = 4;
+
+    private ContentResolver mContentResolver; // 内容解析器，用于与内容提供者交互
+
+    private boolean mIsCreate; // 标识是否为新创建的数据
+
+    private long mDataId; // 数据 ID
+    private String mDataMimeType; // 数据 MIME 类型
+    private String mDataContent; // 数据内容
+    private long mDataContentData1; // 数据内容的附加信息 1
+    private String mDataContentData3; // 数据内容的附加信息 3
+
+    private ContentValues mDiffDataValues; // 存储待更新的内容值
+
+    // 构造函数，初始化 SqlData 实例（用于创建新数据）
+    public SqlData(Context context) {
+        mContentResolver = context.getContentResolver(); // 获取内容解析器
+        mIsCreate = true; // 设置为创建状态
+        mDataId = INVALID_ID; // 初始化数据 ID
+        mDataMimeType = DataConstants.NOTE; // 默认 MIME 类型
+        mDataContent = ""; // 初始化内容为空
+        mDataContentData1 = 0; // 初始化附加信息 1
+        mDataContentData3 = ""; // 初始化附加信息 3
+        mDiffDataValues = new ContentValues(); // 初始化待更新内容值
+    }
+
+    // 构造函数，初始化 SqlData 实例（从游标加载数据）
+    public SqlData(Context context, Cursor c) {
+        mContentResolver = context.getContentResolver(); // 获取内容解析器
+        mIsCreate = false; // 设置为非创建状态
+        loadFromCursor(c); // 从游标加载数据
+        mDiffDataValues = new ContentValues(); // 初始化待更新内容值
+    }
+
+    // 从游标加载数据
+    private void loadFromCursor(Cursor c) {
+        mDataId = c.getLong(DATA_ID_COLUMN); // 获取数据 ID
+        mDataMimeType = c.getString(DATA_MIME_TYPE_COLUMN); // 获取 MIME 类型
+        mDataContent = c.getString(DATA_CONTENT_COLUMN); // 获取内容
+        mDataContentData1 = c.getLong(DATA_CONTENT_DATA_1_COLUMN); // 获取附加信息 1
+        mDataContentData3 = c.getString(DATA_CONTENT_DATA_3_COLUMN); // 获取附加信息 3
+    }
+
+    // 设置内容，从 JSON 对象加载数据
+    public void setContent(JSONObject js) throws JSONException {
+        long dataId = js.has(DataColumns.ID) ? js.getLong(DataColumns.ID) : INVALID_ID; // 获取 ID
+        if (mIsCreate || mDataId != dataId) {
+            mDiffDataValues.put(DataColumns.ID, dataId); // 更新 ID
+        }
+        mDataId = dataId; // 设置 ID
+
+        String dataMimeType = js.has(DataColumns.MIME_TYPE) ? js.getString(DataColumns.MIME_TYPE)
+                : DataConstants.NOTE; // 获取 MIME 类型
+        if (mIsCreate || !mDataMimeType.equals(dataMimeType)) {
+            mDiffDataValues.put(DataColumns.MIME_TYPE, dataMimeType); // 更新 MIME 类型
+        }
+        mDataMimeType = dataMimeType; // 设置 MIME 类型
+
+        String dataContent = js.has(DataColumns.CONTENT) ? js.getString(DataColumns.CONTENT) : ""; // 获取内容
+        if (mIsCreate || !mDataContent.equals(dataContent)) {
+            mDiffDataValues.put(DataColumns.CONTENT, dataContent); // 更新内容
+        }
+        mDataContent = dataContent; // 设置内容
+
+        long dataContentData1 = js.has(DataColumns.DATA1) ? js.getLong(DataColumns.DATA1) : 0; // 获取附加信息 1
+        if (mIsCreate || mDataContentData1 != dataContentData1) {
+            mDiffDataValues.put(DataColumns.DATA1, dataContentData1); // 更新附加信息 1
+        }
+        mDataContentData1 = dataContentData1; // 设置附加信息 1
+
+        String dataContentData3 = js.has(DataColumns.DATA3) ? js.getString(DataColumns.DATA3) : ""; // 获取附加信息 3
+        if (mIsCreate || !mDataContentData3.equals(dataContentData3)) {
+            mDiffDataValues.put(DataColumns.DATA3, dataContentData3); // 更新附加信息 3
+        }
+        mDataContentData3 = dataContentData3; // 设置附加信息 3
+    }
+
+    // 获取内容，返回 JSON 对象
+    public JSONObject getContent() throws JSONException {
+        if (mIsCreate) {
+            Log.e(TAG, "it seems that we haven't created this in database yet"); // 日志警告
+            return null; // 尚未创建，返回 null
+        }
+        JSONObject js = new JSONObject(); // 创建 JSON 对象
+        js.put(DataColumns.ID, mDataId); // 设置 ID
+        js.put(DataColumns.MIME_TYPE, mDataMimeType); // 设置 MIME 类型
+        js.put(DataColumns.CONTENT, mDataContent); // 设置内容
+        js.put(DataColumns.DATA1, mDataContentData1); // 设置附加信息 1
+        js.put(DataColumns.DATA3, mDataContentData3); // 设置附加信息 3
+        return js; // 返回 JSON 对象
+    }
+
+    // 提交数据到数据库
+    public void commit(long noteId, boolean validateVersion, long version) {
+        // 处理创建新数据的情况
+        if (mIsCreate) {
+            if (mDataId == INVALID_ID && mDiffDataValues.containsKey(DataColumns.ID)) {
+                mDiffDataValues.remove(DataColumns.ID); // 移除无效 ID
+            }
+
+            mDiffDataValues.put(DataColumns.NOTE_ID, noteId); // 设置笔记 ID
+            Uri uri = mContentResolver.insert(Notes.CONTENT_DATA_URI, mDiffDataValues); // 插入数据
+            try {
+                mDataId = Long.valueOf(uri.getPathSegments().get(1)); // 获取新创建的 ID
+            } catch (NumberFormatException e) {
+                Log.e(TAG, "Get note id error :" + e.toString()); // 日志错误
+                throw new ActionFailureException("create note failed"); // 抛出异常
+            }
+        } else { // 处理更新数据的情况
+            if (mDiffDataValues.size() > 0) { // 如果有待更新的数据
+                int result = 0;
+                if (!validateVersion) {
+                    // 不进行版本验证直接更新
+                    result = mContentResolver.update(ContentUris.withAppendedId(
+                            Notes.CONTENT_DATA_URI, mDataId), mDiffDataValues, null, null);
+                } else {
+                    // 进行版本验证更新
+                    result = mContentResolver.update(ContentUris.withAppendedId(
+                            Notes.CONTENT_DATA_URI, mDataId), mDiffDataValues,
+                            " ? in (SELECT " + NoteColumns.ID + " FROM " + TABLE.NOTE
+                                    + " WHERE " + NoteColumns.VERSION + "=?)", new String[] {
+                                    String.valueOf(noteId), String.valueOf(version)
+                            });
+                }
+                if (result == 0) {
+                    Log.w(TAG, "there is no update. maybe user updates note when syncing"); // 日志警告
+                }
+            }
+        }
+
+        mDiffDataValues.clear(); // 清空待更新数据
+        mIsCreate = false; // 设置为非创建状态
+    }
+
+    // 获取数据 ID
+    public long getId() {
+        return mDataId; // 返回数据 ID
+    }
+}

src/SqlNote.java

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

src/Task.java

@@ -0,0 +1,334 @@
+/*
+ * 版权所有 (c) 2010-2011, MiCode 开源社区 (www.micode.net)
+ *
+ * 根据 Apache License, Version 2.0 (以下简称“许可协议”) 授权;
+ * 除非遵守许可协议，否则不得使用此文件。
+ * 您可以在以下网址获取许可协议的副本：
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 除非适用法律要求或书面同意，根据许可协议分发的软件按“原样”提供，
+ * 不提供任何明示或暗示的担保或条件。
+ * 请参阅许可协议了解许可权限及限制。
+ */
+
+package net.micode.notes.gtask.data;
+
+import android.database.Cursor;
+import android.text.TextUtils;
+import android.util.Log;
+
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.DataColumns;
+import net.micode.notes.data.Notes.DataConstants;
+import net.micode.notes.data.Notes.NoteColumns;
+import net.micode.notes.gtask.exception.ActionFailureException;
+import net.micode.notes.tool.GTaskStringUtils;
+
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+
+// 任务类，继承自节点类
+public class Task extends Node {
+    private static final String TAG = Task.class.getSimpleName(); // 日志标签
+    private boolean mCompleted; // 任务完成标记
+    private String mNotes; // 任务的备注
+    private JSONObject mMetaInfo; // 任务的元信息
+    private Task mPriorSibling; // 前一个兄弟任务
+    private TaskList mParent; // 任务的父任务列表
+
+    // 构造方法，初始化任务属性
+    public Task() {
+        super();
+        mCompleted = false;
+        mNotes = null;
+        mPriorSibling = null;
+        mParent = null;
+        mMetaInfo = null;
+    }
+
+    // 创建任务的 JSON 对象
+    public JSONObject getCreateAction(int actionId) {
+        JSONObject js = new JSONObject();
+
+        try {
+            // 设置动作类型为创建
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE,
+                    GTaskStringUtils.GTASK_JSON_ACTION_TYPE_CREATE);
+
+            // 设置动作 ID
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, actionId);
+
+            // 设置任务的索引
+            js.put(GTaskStringUtils.GTASK_JSON_INDEX, mParent.getChildTaskIndex(this));
+
+            // 设置实体数据
+            JSONObject entity = new JSONObject();
+            entity.put(GTaskStringUtils.GTASK_JSON_NAME, getName());
+            entity.put(GTaskStringUtils.GTASK_JSON_CREATOR_ID, "null");
+            entity.put(GTaskStringUtils.GTASK_JSON_ENTITY_TYPE,
+                    GTaskStringUtils.GTASK_JSON_TYPE_TASK);
+            if (getNotes() != null) {
+                entity.put(GTaskStringUtils.GTASK_JSON_NOTES, getNotes());
+            }
+            js.put(GTaskStringUtils.GTASK_JSON_ENTITY_DELTA, entity);
+
+            // 设置父任务 ID
+            js.put(GTaskStringUtils.GTASK_JSON_PARENT_ID, mParent.getGid());
+
+            // 设置父任务类型
+            js.put(GTaskStringUtils.GTASK_JSON_DEST_PARENT_TYPE,
+                    GTaskStringUtils.GTASK_JSON_TYPE_GROUP);
+
+            // 设置任务列表 ID
+            js.put(GTaskStringUtils.GTASK_JSON_LIST_ID, mParent.getGid());
+
+            // 设置前一个兄弟任务 ID
+            if (mPriorSibling != null) {
+                js.put(GTaskStringUtils.GTASK_JSON_PRIOR_SIBLING_ID, mPriorSibling.getGid());
+            }
+
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("创建任务 JSON 对象失败");
+        }
+
+        return js;
+    }
+
+    // 更新任务的 JSON 对象
+    public JSONObject getUpdateAction(int actionId) {
+        JSONObject js = new JSONObject();
+
+        try {
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE,
+                    GTaskStringUtils.GTASK_JSON_ACTION_TYPE_UPDATE);
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, actionId);
+            js.put(GTaskStringUtils.GTASK_JSON_ID, getGid());
+
+            JSONObject entity = new JSONObject();
+            entity.put(GTaskStringUtils.GTASK_JSON_NAME, getName());
+            if (getNotes() != null) {
+                entity.put(GTaskStringUtils.GTASK_JSON_NOTES, getNotes());
+            }
+            entity.put(GTaskStringUtils.GTASK_JSON_DELETED, getDeleted());
+            js.put(GTaskStringUtils.GTASK_JSON_ENTITY_DELTA, entity);
+
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("更新任务 JSON 对象失败");
+        }
+
+        return js;
+    }
+
+    // 从远程 JSON 设置任务内容
+    public void setContentByRemoteJSON(JSONObject js) {
+        if (js != null) {
+            try {
+                if (js.has(GTaskStringUtils.GTASK_JSON_ID)) {
+                    setGid(js.getString(GTaskStringUtils.GTASK_JSON_ID));
+                }
+                if (js.has(GTaskStringUtils.GTASK_JSON_LAST_MODIFIED)) {
+                    setLastModified(js.getLong(GTaskStringUtils.GTASK_JSON_LAST_MODIFIED));
+                }
+                if (js.has(GTaskStringUtils.GTASK_JSON_NAME)) {
+                    setName(js.getString(GTaskStringUtils.GTASK_JSON_NAME));
+                }
+                if (js.has(GTaskStringUtils.GTASK_JSON_NOTES)) {
+                    setNotes(js.getString(GTaskStringUtils.GTASK_JSON_NOTES));
+                }
+                if (js.has(GTaskStringUtils.GTASK_JSON_DELETED)) {
+                    setDeleted(js.getBoolean(GTaskStringUtils.GTASK_JSON_DELETED));
+                }
+                if (js.has(GTaskStringUtils.GTASK_JSON_COMPLETED)) {
+                    setCompleted(js.getBoolean(GTaskStringUtils.GTASK_JSON_COMPLETED));
+                }
+            } catch (JSONException e) {
+                Log.e(TAG, e.toString());
+                e.printStackTrace();
+                throw new ActionFailureException("从 JSON 获取任务内容失败");
+            }
+        }
+    }
+
+    // 从本地 JSON 设置任务内容
+    public void setContentByLocalJSON(JSONObject js) {
+        if (js == null || !js.has(GTaskStringUtils.META_HEAD_NOTE)
+                || !js.has(GTaskStringUtils.META_HEAD_DATA)) {
+            Log.w(TAG, "setContentByLocalJSON: 数据为空");
+        }
+
+        try {
+            JSONObject note = js.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
+            JSONArray dataArray = js.getJSONArray(GTaskStringUtils.META_HEAD_DATA);
+
+            if (note.getInt(NoteColumns.TYPE) != Notes.TYPE_NOTE) {
+                Log.e(TAG, "无效类型");
+                return;
+            }
+
+            for (int i = 0; i < dataArray.length(); i++) {
+                JSONObject data = dataArray.getJSONObject(i);
+                if (TextUtils.equals(data.getString(DataColumns.MIME_TYPE), DataConstants.NOTE)) {
+                    setName(data.getString(DataColumns.CONTENT));
+                    break;
+                }
+            }
+
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+        }
+    }
+
+    // 获取本地 JSON 内容
+    public JSONObject getLocalJSONFromContent() {
+        String name = getName();
+        try {
+            if (mMetaInfo == null) {
+                if (name == null) {
+                    Log.w(TAG, "笔记为空");
+                    return null;
+                }
+                JSONObject js = new JSONObject();
+                JSONObject note = new JSONObject();
+                JSONArray dataArray = new JSONArray();
+                JSONObject data = new JSONObject();
+                data.put(DataColumns.CONTENT, name);
+                dataArray.put(data);
+                js.put(GTaskStringUtils.META_HEAD_DATA, dataArray);
+                note.put(NoteColumns.TYPE, Notes.TYPE_NOTE);
+                js.put(GTaskStringUtils.META_HEAD_NOTE, note);
+                return js;
+            } else {
+                JSONObject note = mMetaInfo.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
+                JSONArray dataArray = mMetaInfo.getJSONArray(GTaskStringUtils.META_HEAD_DATA);
+
+                for (int i = 0; i < dataArray.length(); i++) {
+                    JSONObject data = dataArray.getJSONObject(i);
+                    if (TextUtils.equals(data.getString(DataColumns.MIME_TYPE), DataConstants.NOTE)) {
+                        data.put(DataColumns.CONTENT, getName());
+                        break;
+                    }
+                }
+
+                note.put(NoteColumns.TYPE, Notes.TYPE_NOTE);
+                return mMetaInfo;
+            }
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            return null;
+        }
+    }
+
+    // 设置元信息
+    public void setMetaInfo(MetaData metaData) {
+        if (metaData != null && metaData.getNotes() != null) {
+            try {
+                mMetaInfo = new JSONObject(metaData.getNotes());
+            } catch (JSONException e) {
+                Log.w(TAG, e.toString());
+                mMetaInfo = null;
+            }
+        }
+    }
+
+    // 获取同步操作
+    public int getSyncAction(Cursor c) {
+        try {
+            JSONObject noteInfo = null;
+            if (mMetaInfo != null && mMetaInfo.has(GTaskStringUtils.META_HEAD_NOTE)) {
+                noteInfo = mMetaInfo.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
+            }
+
+            if (noteInfo == null) {
+                Log.w(TAG, "笔记元数据已删除");
+                return SYNC_ACTION_UPDATE_REMOTE;
+            }
+
+            if (!noteInfo.has(NoteColumns.ID)) {
+                Log.w(TAG, "远程笔记 ID 似乎被删除");
+                return SYNC_ACTION_UPDATE_LOCAL;
+            }
+
+            if (c.getLong(SqlNote.ID_COLUMN) != noteInfo.getLong(NoteColumns.ID)) {
+                Log.w(TAG, "笔记 ID 不匹配");
+                return SYNC_ACTION_UPDATE_LOCAL;
+            }
+
+            if (c.getInt(SqlNote.LOCAL_MODIFIED_COLUMN) == 0) {
+                if (c.getLong(SqlNote.SYNC_ID_COLUMN) == getLastModified()) {
+                    return SYNC_ACTION_NONE;
+                } else {
+                    return SYNC_ACTION_UPDATE_LOCAL;
+                }
+            } else {
+                if (!c.getString(SqlNote.GTASK_ID_COLUMN).equals(getGid())) {
+                    Log.e(TAG, "gtask ID 不匹配");
+                    return SYNC_ACTION_ERROR;
+                }
+                if (c.getLong(SqlNote.SYNC_ID_COLUMN) == getLastModified()) {
+                    return SYNC_ACTION_UPDATE_REMOTE;
+                } else {
+                    return SYNC_ACTION_UPDATE_CONFLICT;
+                }
+            }
+        } catch (Exception e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+        }
+
+        return SYNC_ACTION_ERROR;
+    }
+
+    // 检查任务是否值得保存
+    public boolean isWorthSaving() {
+        return mMetaInfo != null || (getName() != null && getName().trim().length() > 0)
+                || (getNotes() != null && getNotes().trim().length() > 0);
+    }
+
+    // 设置任务完成状态
+    public void setCompleted(boolean completed) {
+        this.mCompleted = completed;
+    }
+
+    // 设置备注
+    public void setNotes(String notes) {
+        this.mNotes = notes;
+    }
+
+    // 设置前一个兄弟任务
+    public void setPriorSibling(Task priorSibling) {
+        this.mPriorSibling = priorSibling;
+    }
+
+    // 设置父任务列表
+    public void setParent(TaskList parent) {
+        this.mParent = parent;
+    }
+
+    // 获取任务完成状态
+    public boolean getCompleted() {
+        return this.mCompleted;
+    }
+
+    // 获取备注
+    public String getNotes() {
+        return this.mNotes;
+    }
+
+    // 获取前一个兄弟任务
+    public Task getPriorSibling() {
+        return this.mPriorSibling;
+    }
+
+    // 获取父任务列表
+    public TaskList getParent() {
+        return this.mParent;
+    }
+}

src/TaskList.java

@@ -0,0 +1,351 @@
+/*
+ * 版权所有 (c) 2010-2011, MiCode 开源社区 (www.micode.net)
+ *
+ * 根据 Apache 许可证 2.0 版授权 ("许可证");
+ * 只有在符合许可证的情况下，您才能使用此文件。
+ * 您可以在以下位置获取许可证副本：
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 除非适用法律要求或书面同意，按“原样”分发的许可证软件，
+ * 无任何明示或暗示的担保或条件。
+ * 请参阅许可证以获取许可下的具体语言和限制。
+ */
+
+package net.micode.notes.gtask.data;
+
+import android.database.Cursor;
+import android.util.Log;
+
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.NoteColumns;
+import net.micode.notes.gtask.exception.ActionFailureException;
+import net.micode.notes.tool.GTaskStringUtils;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.util.ArrayList;
+
+/**
+ * 任务列表类，继承自节点类
+ */
+public class TaskList extends Node {
+    private static final String TAG = TaskList.class.getSimpleName(); // 日志标签
+
+    private int mIndex; // 索引号
+
+    private ArrayList<Task> mChildren; // 子任务列表
+
+    // 构造函数
+    public TaskList() {
+        super();
+        mChildren = new ArrayList<Task>();
+        mIndex = 1;
+    }
+
+    /**
+     * 创建任务列表的JSON对象
+     * @param actionId 动作ID
+     * @return 创建的JSON对象
+     */
+    public JSONObject getCreateAction(int actionId) {
+        JSONObject js = new JSONObject();
+        try {
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE, GTaskStringUtils.GTASK_JSON_ACTION_TYPE_CREATE); // 动作类型
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, actionId); // 动作ID
+            js.put(GTaskStringUtils.GTASK_JSON_INDEX, mIndex); // 索引
+
+            // 设置实体信息
+            JSONObject entity = new JSONObject();
+            entity.put(GTaskStringUtils.GTASK_JSON_NAME, getName()); // 名称
+            entity.put(GTaskStringUtils.GTASK_JSON_CREATOR_ID, "null"); // 创建者ID
+            entity.put(GTaskStringUtils.GTASK_JSON_ENTITY_TYPE, GTaskStringUtils.GTASK_JSON_TYPE_GROUP); // 实体类型
+            js.put(GTaskStringUtils.GTASK_JSON_ENTITY_DELTA, entity);
+
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("生成任务列表创建JSON对象失败");
+        }
+        return js;
+    }
+
+    /**
+     * 更新任务列表的JSON对象
+     * @param actionId 动作ID
+     * @return 更新的JSON对象
+     */
+    public JSONObject getUpdateAction(int actionId) {
+        JSONObject js = new JSONObject();
+        try {
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE, GTaskStringUtils.GTASK_JSON_ACTION_TYPE_UPDATE); // 动作类型
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, actionId); // 动作ID
+            js.put(GTaskStringUtils.GTASK_JSON_ID, getGid()); // 任务ID
+
+            // 设置实体信息
+            JSONObject entity = new JSONObject();
+            entity.put(GTaskStringUtils.GTASK_JSON_NAME, getName()); // 名称
+            entity.put(GTaskStringUtils.GTASK_JSON_DELETED, getDeleted()); // 删除状态
+            js.put(GTaskStringUtils.GTASK_JSON_ENTITY_DELTA, entity);
+
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("生成任务列表更新JSON对象失败");
+        }
+        return js;
+    }
+
+    /**
+     * 从远程JSON设置任务列表内容
+     */
+    public void setContentByRemoteJSON(JSONObject js) {
+        if (js != null) {
+            try {
+                if (js.has(GTaskStringUtils.GTASK_JSON_ID)) {
+                    setGid(js.getString(GTaskStringUtils.GTASK_JSON_ID)); // 设置ID
+                }
+                if (js.has(GTaskStringUtils.GTASK_JSON_LAST_MODIFIED)) {
+                    setLastModified(js.getLong(GTaskStringUtils.GTASK_JSON_LAST_MODIFIED)); // 设置最后修改时间
+                }
+                if (js.has(GTaskStringUtils.GTASK_JSON_NAME)) {
+                    setName(js.getString(GTaskStringUtils.GTASK_JSON_NAME)); // 设置名称
+                }
+
+            } catch (JSONException e) {
+                Log.e(TAG, e.toString());
+                e.printStackTrace();
+                throw new ActionFailureException("从JSON对象获取任务列表内容失败");
+            }
+        }
+    }
+
+    /**
+     * 从本地JSON设置任务列表内容
+     */
+    public void setContentByLocalJSON(JSONObject js) {
+        if (js == null || !js.has(GTaskStringUtils.META_HEAD_NOTE)) {
+            Log.w(TAG, "setContentByLocalJSON: 无可用内容");
+            return;
+        }
+
+        try {
+            JSONObject folder = js.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
+
+            if (folder.getInt(NoteColumns.TYPE) == Notes.TYPE_FOLDER) {
+                String name = folder.getString(NoteColumns.SNIPPET);
+                setName(GTaskStringUtils.MIUI_FOLDER_PREFFIX + name);
+            } else if (folder.getInt(NoteColumns.TYPE) == Notes.TYPE_SYSTEM) {
+                if (folder.getLong(NoteColumns.ID) == Notes.ID_ROOT_FOLDER)
+                    setName(GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_DEFAULT);
+                else if (folder.getLong(NoteColumns.ID) == Notes.ID_CALL_RECORD_FOLDER)
+                    setName(GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_CALL_NOTE);
+                else
+                    Log.e(TAG, "无效的系统文件夹");
+            } else {
+                Log.e(TAG, "错误的类型");
+            }
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+        }
+    }
+
+    /**
+     * 获取任务列表内容并转换为本地JSON对象
+     */
+    public JSONObject getLocalJSONFromContent() {
+        try {
+            JSONObject js = new JSONObject();
+            JSONObject folder = new JSONObject();
+            String folderName = getName();
+
+            // 处理文件夹名称
+            if (getName().startsWith(GTaskStringUtils.MIUI_FOLDER_PREFFIX)) {
+                folderName = folderName.substring(GTaskStringUtils.MIUI_FOLDER_PREFFIX.length());
+            }
+
+            folder.put(NoteColumns.SNIPPET, folderName);
+            folder.put(NoteColumns.TYPE, folderName.equals(GTaskStringUtils.FOLDER_DEFAULT)
+                    || folderName.equals(GTaskStringUtils.FOLDER_CALL_NOTE)
+                    ? Notes.TYPE_SYSTEM : Notes.TYPE_FOLDER);
+
+            js.put(GTaskStringUtils.META_HEAD_NOTE, folder);
+
+            return js;
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            return null;
+        }
+    }
+
+    /**
+     * 根据游标信息获取同步操作类型
+     */
+    public int getSyncAction(Cursor c) {
+        try {
+            if (c.getInt(SqlNote.LOCAL_MODIFIED_COLUMN) == 0) {
+                // 没有本地更新
+                return c.getLong(SqlNote.SYNC_ID_COLUMN) == getLastModified() ? SYNC_ACTION_NONE : SYNC_ACTION_UPDATE_LOCAL;
+            } else {
+                // 验证任务ID
+                if (!c.getString(SqlNote.GTASK_ID_COLUMN).equals(getGid())) {
+                    Log.e(TAG, "任务ID不匹配");
+                    return SYNC_ACTION_ERROR;
+                }
+                return c.getLong(SqlNote.SYNC_ID_COLUMN) == getLastModified() ? SYNC_ACTION_UPDATE_REMOTE : SYNC_ACTION_UPDATE_REMOTE;
+            }
+        } catch (Exception e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+        }
+        return SYNC_ACTION_ERROR;
+    }
+
+    /**
+     * 获取子任务数量
+     */
+    public int getChildTaskCount() {
+        return mChildren.size();
+    }
+
+    /**
+     * 添加子任务
+     */
+    public boolean addChildTask(Task task) {
+        if (task != null && !mChildren.contains(task)) {
+            boolean ret = mChildren.add(task);
+            if (ret) {
+                task.setPriorSibling(mChildren.isEmpty() ? null : mChildren.get(mChildren.size() - 1));
+                task.setParent(this);
+            }
+            return ret;
+        }
+        return false;
+    }
+
+    /**
+     * 添加子任务到指定位置
+     */
+    public boolean addChildTask(Task task, int index) {
+        if (index < 0 || index > mChildren.size()) {
+            Log.e(TAG, "添加子任务：无效索引");
+            return false;
+        }
+        if (task != null && mChildren.indexOf(task) == -1) {
+            mChildren.add(index, task);
+
+            // 更新子任务链
+            Task preTask = index != 0 ? mChildren.get(index - 1) : null;
+            Task afterTask = index != mChildren.size() - 1 ? mChildren.get(index + 1) : null;
+
+            task.setPriorSibling(preTask);
+            if (afterTask != null) {
+                afterTask.setPriorSibling(task);
+            }
+        }
+        return true;
+    }
+
+    /**
+     * 从任务列表中删除子任务
+     */
+    public boolean removeChildTask(Task task) {
+        int index = mChildren.indexOf(task);
+        if (index != -1) {
+            boolean ret = mChildren.remove(task);
+            if (ret) {
+                task.setPriorSibling(null);
+                task.setParent(null);
+
+                // 更新任务链
+                if (index != mChildren.size()) {
+                    mChildren.get(index).setPriorSibling(index == 0 ? null : mChildren.get(index - 1));
+                }
+            }
+            return ret;
+        }
+        return false;
+    }
+
+    /**
+     * 移动子任务到指定位置
+     */
+    public boolean moveChildTask(Task task, int index) {
+        if (index < 0 || index >= mChildren.size()) {
+            Log.e(TAG, "移动子任务：无效索引");
+            return false;
+        }
+        int pos = mChildren.indexOf(task);
+        if (pos == -1) {
+            Log.e(TAG, "移动子任务：任务应在列表中");
+            return false;
+        }
+        return pos == index || (removeChildTask(task) && addChildTask(task, index));
+    }
+
+    /**
+     * 通过GID查找子任务
+     */
+    public Task findChildTaskByGid(String gid) {
+        for (Task t : mChildren) {
+            if (t.getGid().equals(gid)) {
+                return t;
+            }
+        }
+        return null;
+    }
+
+    /**
+     * 获取子任务的索引
+     */
+    public int getChildTaskIndex(Task task) {
+        return mChildren.indexOf(task);
+    }
+
+    /**
+     * 通过索引获取子任务
+     */
+    public Task getChildTaskByIndex(int index) {
+        if (index < 0 || index >= mChildren.size()) {
+            Log.e(TAG, "getTaskByIndex: 无效索引");
+            return null;
+        }
+        return mChildren.get(index);
+    }
+
+    /**
+     * 通过GID获取子任务
+     */
+    public Task getChilTaskByGid(String gid) {
+        for (Task task : mChildren) {
+            if (task.getGid().equals(gid)) {
+                return task;
+            }
+        }
+        return null;
+    }
+
+    /**
+     * 获取子任务列表
+     */
+    public ArrayList<Task> getChildTaskList() {
+        return this.mChildren;
+    }
+
+    /**
+     * 设置索引
+     */
+    public void setIndex(int index) {
+        this.mIndex = index;
+    }
+
+    /**
+     * 获取索引
+     */
+    public int getIndex() {
+        return this.mIndex;
+    }
+}

src/WorkingNote.java

@@ -0,0 +1,254 @@
+/*
+ * 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;
+
+/**
+ * WorkingNote 类处理与笔记相关的工作逻辑。它支持创建新笔记、加载现有笔记、设置笔记内容、
+ * 管理笔记的背景色、提醒时间等，同时支持与小部件的交互。
+ */
+public class WorkingNote {
+    private Note mNote;  // 代表笔记的 Note 对象
+    private long mNoteId;  // 笔记的 ID
+    private String mContent;  // 笔记的内容（文本）
+    private int mMode;  // 笔记的模式（例如：清单模式）
+    private long mAlertDate;  // 提醒时间
+    private long mModifiedDate;  // 最后修改时间
+    private int mBgColorId;  // 背景色 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
+    private boolean mIsDeleted;  // 是否被标记为已删除
+    private NoteSettingChangedListener mNoteSettingStatusListener;  // 设置变更监听器
+
+    private static final String TAG = "WorkingNote";  // 日志标签
+
+    // 数据查询的列名数组
+    public static final String[] DATA_PROJECTION = new String[] {
+            DataColumns.ID, DataColumns.CONTENT, DataColumns.MIME_TYPE, DataColumns.DATA1, 
+            DataColumns.DATA2, DataColumns.DATA3, DataColumns.DATA4
+    };
+
+    // 笔记数据的查询列名
+    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
+    };
+
+    // 各列的索引常量
+    private static final int DATA_ID_COLUMN = 0;
+    private static final int DATA_CONTENT_COLUMN = 1;
+    private static final int DATA_MIME_TYPE_COLUMN = 2;
+    private static final int DATA_MODE_COLUMN = 3;
+
+    private static final int NOTE_PARENT_ID_COLUMN = 0;
+    private static final int NOTE_ALERTED_DATE_COLUMN = 1;
+    private static final int NOTE_BG_COLOR_ID_COLUMN = 2;
+    private static final int NOTE_WIDGET_ID_COLUMN = 3;
+    private static final int NOTE_WIDGET_TYPE_COLUMN = 4;
+    private static final int NOTE_MODIFIED_DATE_COLUMN = 5;
+
+    /**
+     * 构造一个新的工作笔记
+     */
+    private WorkingNote(Context context, long folderId) {
+        mContext = context;
+        mAlertDate = 0;
+        mModifiedDate = System.currentTimeMillis();
+        mFolderId = folderId;
+        mNote = new Note();  // 创建一个新的 Note 对象
+        mNoteId = 0;
+        mIsDeleted = false;
+        mMode = 0;
+        mWidgetType = Notes.TYPE_WIDGET_INVALIDE;  // 默认无效的小部件类型
+    }
+
+    /**
+     * 构造一个现有的工作笔记
+     */
+    private WorkingNote(Context context, long noteId, long folderId) {
+        mContext = context;
+        mNoteId = noteId;
+        mFolderId = folderId;
+        mIsDeleted = false;
+        mNote = new Note();
+        loadNote();  // 加载笔记数据
+    }
+
+    /**
+     * 从数据库加载笔记的信息
+     */
+    private void loadNote() {
+        // 从笔记内容 URI 中查询笔记的基本信息
+        Cursor cursor = mContext.getContentResolver().query(
+                ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, mNoteId), NOTE_PROJECTION, null,
+                null, null);
+
+        if (cursor != null) {
+            if (cursor.moveToFirst()) {
+                // 获取笔记的基本信息
+                mFolderId = cursor.getLong(NOTE_PARENT_ID_COLUMN);
+                mBgColorId = cursor.getInt(NOTE_BG_COLOR_ID_COLUMN);
+                mWidgetId = cursor.getInt(NOTE_WIDGET_ID_COLUMN);
+                mWidgetType = cursor.getInt(NOTE_WIDGET_TYPE_COLUMN);
+                mAlertDate = cursor.getLong(NOTE_ALERTED_DATE_COLUMN);
+                mModifiedDate = cursor.getLong(NOTE_MODIFIED_DATE_COLUMN);
+            }
+            cursor.close();
+        } else {
+            Log.e(TAG, "No note with id:" + mNoteId);
+            throw new IllegalArgumentException("Unable to find note with id " + mNoteId);
+        }
+        loadNoteData();  // 加载笔记的内容数据
+    }
+
+    /**
+     * 加载笔记的具体内容（如文本内容或通话记录等）
+     */
+    private void loadNoteData() {
+        // 查询笔记的数据内容
+        Cursor cursor = mContext.getContentResolver().query(Notes.CONTENT_DATA_URI, DATA_PROJECTION,
+                DataColumns.NOTE_ID + "=?", new String[] {
+                    String.valueOf(mNoteId)
+                }, null);
+
+        if (cursor != null) {
+            if (cursor.moveToFirst()) {
+                do {
+                    String type = cursor.getString(DATA_MIME_TYPE_COLUMN);
+                    if (DataConstants.NOTE.equals(type)) {
+                        mContent = cursor.getString(DATA_CONTENT_COLUMN);
+                        mMode = cursor.getInt(DATA_MODE_COLUMN);
+                        mNote.setTextDataId(cursor.getLong(DATA_ID_COLUMN));  // 设置文本数据ID
+                    } else if (DataConstants.CALL_NOTE.equals(type)) {
+                        mNote.setCallDataId(cursor.getLong(DATA_ID_COLUMN));  // 设置通话数据ID
+                    } else {
+                        Log.d(TAG, "Wrong note type with type:" + type);
+                    }
+                } while (cursor.moveToNext());
+            }
+            cursor.close();
+        } else {
+            Log.e(TAG, "No data with id:" + mNoteId);
+            throw new IllegalArgumentException("Unable to find note's data with id " + mNoteId);
+        }
+    }
+
+    /**
+     * 创建一个空的工作笔记
+     */
+    public static WorkingNote createEmptyNote(Context context, long folderId, int widgetId,
+            int widgetType, int defaultBgColorId) {
+        WorkingNote note = new WorkingNote(context, folderId);
+        note.setBgColorId(defaultBgColorId);  // 设置背景色
+        note.setWidgetId(widgetId);  // 设置小部件ID
+        note.setWidgetType(widgetType);  // 设置小部件类型
+        return note;
+    }
+
+    /**
+     * 加载指定ID的工作笔记
+     */
+    public static WorkingNote load(Context context, long id) {
+        return new WorkingNote(context, id, 0);
+    }
+
+    /**
+     * 保存笔记
+     */
+    public synchronized boolean saveNote() {
+        if (isWorthSaving()) {  // 如果笔记值得保存
+            if (!existInDatabase()) {  // 如果笔记不存在数据库
+                if ((mNoteId = Note.getNewNoteId(mContext, mFolderId)) == 0) {
+                    Log.e(TAG, "Create new note fail with id:" + mNoteId);
+                    return false;
+                }
+            }
+
+            mNote.syncNote(mContext, mNoteId);  // 同步笔记内容到数据库
+
+            // 如果笔记关联了小部件，更新小部件内容
+            if (mWidgetId != AppWidgetManager.INVALID_APPWIDGET_ID
+                    && mWidgetType != Notes.TYPE_WIDGET_INVALIDE
+                    && mNoteSettingStatusListener != null) {
+                mNoteSettingStatusListener.onWidgetChanged();
+            }
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    /**
+     * 判断笔记是否已经存在于数据库
+     */
+    public boolean existInDatabase() {
+        return mNoteId > 0;
+    }
+
+    /**
+     * 判断笔记是否值得保存
+     */
+    private boolean isWorthSaving() {
+        return !(mIsDeleted || (TextUtils.isEmpty(mContent) && !existInDatabase()) 
+                 || (existInDatabase() && !mNote.isLocalModified()));  // 判断笔记是否被删除或没有修改
+    }
+
+    // 其他设置方法（设置提醒时间、背景色、小部件等）
+    public void setAlertDate(long date, boolean set) { ... }
+    public void markDeleted(boolean mark) { ... }
+    public void setBgColorId(int id) { ... }
+    public void setCheckListMode(int mode) { ... }
+    public void setWidgetType(int type) { ... }
+    public void setWidgetId(int id) { ... }
+    public void setWorkingText(String text) { ... }
+
+    // 获取笔记内容、提醒时间、修改时间等信息
+    public String getContent() { return mContent; }
+    public long getAlertDate() { return mAlertDate; }
+    public long getModifiedDate() { return mModifiedDate; }
+    public int getBgColorResId() { return NoteBgResources.getNoteBgResource(mBgColorId); }
+    public int getBgColorId() { return mBgColorId; }
+    public int getCheckListMode() { return mMode; }
+    public long getNoteId() { return mNoteId; }
+    public long getFolderId() { return mFolderId; }
+    public int getWidgetId() { return mWidgetId; }
+    public int getWidgetType() { return mWidgetType; }
+
+    // 设置变更监听接口
+    public interface NoteSettingChangedListener { 
+        void onBackgroundColorChanged();  // 背景色变更时调用
+        void onClockAlertChanged(long date, boolean set);  // 提醒时间变更时调用
+        void onWidgetChanged();  // 小部件变更时调用
+        void onCheckListModeChanged(int oldMode, int newMode);  // 清单模式切换时调用
+    }
+}