diff --git a/doc/小米标签MiNote+泛读报告.docx b/doc/小米标签MiNote+泛读报告.docx
deleted file mode 100644
index 3981294..0000000
Binary files a/doc/小米标签MiNote+泛读报告.docx and /dev/null differ
diff --git a/src/Contact.java b/src/Contact.java
deleted file mode 100644
index b9b793b..0000000
--- a/src/Contact.java
+++ /dev/null
@@ -1,87 +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.data;
-
-import android.content.Context; // 导入Android上下文类，用于访问系统资源
-import android.database.Cursor; // 导入Android游标类，用于查询数据库
-import android.provider.ContactsContract.CommonDataKinds.Phone; // 导入Android联系人电话信息类
-import android.provider.ContactsContract.Data; // 导入Android联系人数据类
-import android.telephony.PhoneNumberUtils; // 导入Android电话号码工具类
-import android.util.Log; // 导入Android日志工具类
-
-import java.util.HashMap; // 导入Java哈希表类，用于缓存查询结果
-
-public class Contact {
-    // 静态的哈希表，用于缓存电话号码和对应的联系人姓名
-    private static HashMap<String, String> sContactCache;
-    // 日志标签，用于在日志中标识来自该类的消息
-    private static final String TAG = "Contact";
-
-    // SQL查询条件，用于查找与给定电话号码匹配的联系人信息
-    // 使用PHONE_NUMBERS_EQUAL函数比较电话号码，确保号码格式的一致性
-    // 限制数据类型为电话号码类型，并通过子查询确保电话号码的最小匹配字符为'+'
-    private static final String CALLER_ID_SELECTION = "PHONE_NUMBERS_EQUAL(" + Phone.NUMBER
-            + ",?) AND " + Data.MIMETYPE + "='" + Phone.CONTENT_ITEM_TYPE + "'"
-            + " AND " + Data.RAW_CONTACT_ID + " IN "
-            + "(SELECT raw_contact_id "
-            + " FROM phone_lookup"
-            + " WHERE min_match = '+')";
-
-    // 根据给定的电话号码获取联系人的姓名
-    public static String getContact(Context context, String phoneNumber) {
-        // 如果缓存为空，则初始化缓存
-        if(sContactCache == null) {
-            sContactCache = new HashMap<String, String>();
-        }
-
-        // 检查缓存中是否已有该电话号码对应的联系人姓名
-        if(sContactCache.containsKey(phoneNumber)) {
-            return sContactCache.get(phoneNumber); // 如果存在，则直接返回缓存中的姓名
-        }
-
-        // 构造SQL查询条件，将占位符"+"替换为电话号码的最小匹配字符
-        String selection = CALLER_ID_SELECTION.replace("+",
-                PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));
-
-        // 执行数据库查询，获取与电话号码匹配的联系人姓名
-        Cursor cursor = context.getContentResolver().query(
-                Data.CONTENT_URI, // 查询联系人数据表
-                new String [] { Phone.DISPLAY_NAME }, // 需要查询的字段：联系人显示名称
-                selection, // 查询条件
-                new String[] { phoneNumber }, // 查询条件中的占位符参数
-                null); // 排序条件，这里为null表示不排序
-
-        // 检查查询结果是否为空且是否可以移动到第一行
-        if (cursor != null && cursor.moveToFirst()) {
-            try {
-                String name = cursor.getString(0); // 获取联系人显示名称
-                sContactCache.put(phoneNumber, name); // 将查询结果存入缓存
-                return name; // 返回联系人姓名
-            } catch (IndexOutOfBoundsException e) {
-                // 如果发生数组越界异常，记录错误日志并返回null
-                Log.e(TAG, " Cursor get string error " + e.toString());
-                return null;
-            } finally {
-                cursor.close(); // 关闭游标，释放资源
-            }
-        } else {
-            // 如果没有找到匹配的联系人，记录调试日志并返回null
-            Log.d(TAG, "No contact matched with number:" + phoneNumber);
-            return null;
-        }
-    }
-}
diff --git a/src/Notes.java b/src/Notes.java
deleted file mode 100644
index 2f2907e..0000000
--- a/src/Notes.java
+++ /dev/null
@@ -1,298 +0,0 @@
-/*
- * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * 你可以在不违反许可协议的情况下使用此文件。
- * 你可以在以下地址获取许可证的副本：
- *
- *        http://www.apache.org/licenses/LICENSE-2.0
- *
- * 除非适用法律要求或书面同意，软件
- * 根据许可证分发是按“原样”基础进行的，
- * 不附带任何明示或暗示的担保或条件。
- * 请参阅许可证以获取特定语言的权限和
- * 限制。
- */
-
-package net.micode.notes.data;
-
-import android.net.Uri;
-
-// 定义了一个名为Notes的类，包含了与笔记应用相关的常量和接口
-public class Notes {
-    // 定义了Content Provider的权限字符串
-    public static final String AUTHORITY = "micode_notes";
-    // 定义了日志标签字符串
-    public static final String TAG = "Notes";
-
-    // 定义了笔记类型的常量
-    public static final int TYPE_NOTE = 0;  // 笔记类型
-    public static final int TYPE_FOLDER = 1;  // 文件夹类型
-    public static final int TYPE_SYSTEM = 2;  // 系统类型
-
-    /**
-     * 以下ID是系统文件夹的标识符
-     * {@link Notes#ID_ROOT_FOLDER } 是默认文件夹
-     * {@link Notes#ID_TEMPARAY_FOLDER } 用于不属于任何文件夹的笔记
-     * {@link Notes#ID_CALL_RECORD_FOLDER} 用于存储通话记录
-     * {@link Notes#ID_TRASH_FOLER} 用于存储已删除的笔记
-     */
-    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;
-
-    // 定义了一些Intent的extra键名
-    public static final String INTENT_EXTRA_ALERT_DATE = "net.micode.notes.alert_date";  // 提醒日期
-    public static final String INTENT_EXTRA_BACKGROUND_ID = "net.micode.notes.background_color_id";  // 背景颜色ID
-    public static final String INTENT_EXTRA_WIDGET_ID = "net.micode.notes.widget_id";  // 小部件ID
-    public static final String INTENT_EXTRA_WIDGET_TYPE = "net.micode.notes.widget_type";  // 小部件类型
-    public static final String INTENT_EXTRA_FOLDER_ID = "net.micode.notes.folder_id";  // 文件夹ID
-    public static final String INTENT_EXTRA_CALL_DATE = "net.micode.notes.call_date";  // 通话日期
-
-    // 定义了小部件类型的常量
-    public static final int TYPE_WIDGET_INVALIDE = -1;  // 无效的小部件
-    public static final int TYPE_WIDGET_2X = 0;  // 2x尺寸的小部件
-    public static final int TYPE_WIDGET_4X = 1;  // 4x尺寸的小部件
-
-    // 定义一个内部类DataConstants，包含一些与数据类型相关的常量
-    public static class DataConstants {
-        // 定义了文本笔记的数据类型
-        public static final String NOTE = TextNote.CONTENT_ITEM_TYPE;
-        // 定义了通话笔记的数据类型
-        public static final String CALL_NOTE = CallNote.CONTENT_ITEM_TYPE;
-    }
-
-    /**
-     * Uri用于查询所有的笔记和文件夹
-     * 解析为：content://micode_notes/note
-     */
-    public static final Uri CONTENT_NOTE_URI = Uri.parse("content://" + AUTHORITY + "/note");
-
-    /**
-     * Uri用于查询数据
-     * 解析为：content://micode_notes/data
-     */
-    public static final Uri CONTENT_DATA_URI = Uri.parse("content://" + AUTHORITY + "/data");
-
-    // 定义了一个接口NoteColumns，包含了一些与笔记和文件夹相关的列名
-    public interface NoteColumns {
-        /**
-         * 笔记或文件夹的唯一ID
-         * <P> 类型：INTEGER (long) </P>
-         */
-        public static final String ID = "_id";
-
-        /**
-         * 笔记或文件夹的父ID
-         * <P> 类型：INTEGER (long) </P>
-         */
-        public static final String PARENT_ID = "parent_id";
-
-        /**
-         * 笔记或文件夹的创建日期
-         * <P> 类型：INTEGER (long) </P>
-         */
-        public static final String CREATED_DATE = "created_date";
-
-        /**
-         * 笔记或文件夹的最新修改日期
-         * <P> 类型：INTEGER (long) </P>
-         */
-        public static final String MODIFIED_DATE = "modified_date";
-
-        /**
-         * 笔记的提醒日期
-         * <P> 类型：INTEGER (long) </P>
-         */
-        public static final String ALERTED_DATE = "alert_date";
-
-        /**
-         * 文件夹的名称或笔记的文本内容
-         * <P> 类型：TEXT </P>
-         */
-        public static final String SNIPPET = "snippet";
-
-        /**
-         * 笔记的小部件ID
-         * <P> 类型：INTEGER (long) </P>
-         */
-        public static final String WIDGET_ID = "widget_id";
-
-        /**
-         * 笔记的小部件类型
-         * <P> 类型：INTEGER (long) </P>
-         */
-        public static final String WIDGET_TYPE = "widget_type";
-
-        /**
-         * 笔记的背景颜色ID
-         * <P> 类型：INTEGER (long) </P>
-         */
-        public static final String BG_COLOR_ID = "bg_color_id";
-
-        /**
-         * 对于文本笔记，它没有附件；对于多媒体笔记，至少有一个附件
-         * <P> 类型：INTEGER </P>
-         */
-        public static final String HAS_ATTACHMENT = "has_attachment";
-
-        /**
-         * 文件夹中的笔记数量
-         * <P> 类型：INTEGER (long) </P>
-         */
-        public static final String NOTES_COUNT = "notes_count";
-
-        /**
-         * 笔记或文件夹的类型
-         * <P> 类型：INTEGER </P>
-         */
-        public static final String TYPE = "type";
-
-        /**
-         * 最后同步ID
-         * <P> 类型：INTEGER (long) </P>
-         */
-        public static final String SYNC_ID = "sync_id";
-
-        /**
-         * 标志以指示是否本地修改过
-         * <P> 类型：INTEGER </P>
-         */
-        public static final String LOCAL_MODIFIED = "local_modified";
-
-        /**
-         * 移动到临时文件夹之前的原始父ID
-         * <P> 类型：INTEGER </P>
-         */
-        public static final String ORIGIN_PARENT_ID = "origin_parent_id";
-
-        /**
-         * Google任务ID
-         * <P> 类型：TEXT </P>
-         */
-        public static final String GTASK_ID = "gtask_id";
-
-        /**
-         * 版本号
-         * <P> 类型：INTEGER (long) </P>
-         */
-        public static final String VERSION = "version";
-    }
-
-    // 定义了一个接口DataColumns，包含了一些与数据相关的列名
-    public interface DataColumns {
-        /**
-         * 数据的唯一ID
-         * <P> 类型：INTEGER (long) </P>
-         */
-        public static final String ID = "_id";
-
-        /**
-         * 此行所代表项目的数据类型（MIME类型）。
-         * <P> 类型：TEXT </P>
-         */
-        public static final String MIME_TYPE = "mime_type";
-
-        /**
-         * 引用此数据属于的笔记ID
-         * <P> 类型：INTEGER (long) </P>
-         */
-        public static final String NOTE_ID = "note_id";
-
-        /**
-         * 数据的创建日期
-         * <P> 类型：INTEGER (long) </P>
-         */
-        public static final String CREATED_DATE = "created_date";
-
-        /**
-         * 数据的最新修改日期
-         * <P> 类型：INTEGER (long) </P>
-         */
-        public static final String MODIFIED_DATE = "modified_date";
-
-        /**
-         * 数据的内容
-         * <P> 类型：TEXT </P>
-         */
-        public static final String CONTENT = "content";
-
-        /**
-         * 通用数据列，含义取决于 {@link #MIME_TYPE}，用于整型数据类型
-         * <P> 类型：INTEGER </P>
-         */
-        public static final String DATA1 = "data1";
-
-        /**
-         * 通用数据列，含义取决于 {@link #MIME_TYPE}，用于整型数据类型
-         * <P> 类型：INTEGER </P>
-         */
-        public static final String DATA2 = "data2";
-
-        /**
-         * 通用数据列，含义取决于 {@link #MIME_TYPE}，用于文本数据类型
-         * <P> 类型：TEXT </P>
-         */
-        public static final String DATA3 = "data3";
-
-        /**
-         * 通用数据列，含义取决于 {@link #MIME_TYPE}，用于文本数据类型
-         * <P> 类型：TEXT </P>
-         */
-        public static final String DATA4 = "data4";
-
-        /**
-         * 通用数据列，含义取决于 {@link #MIME_TYPE}，用于文本数据类型
-         * <P> 类型：TEXT </P>
-         */
-        public static final String DATA5 = "data5";
-    }
-
-    // 定义了一个内部类TextNote，继承自DataColumns，表示文本笔记的数据结构
-    public static final class TextNote implements DataColumns {
-        /**
-         * 模式以指示文本是否处于检查列表模式
-         * <P> 类型：Integer 1:检查列表模式 0:正常模式 </P>
-         */
-        public static final String MODE = DATA1;
-
-        // 定义了文本笔记模式的常量
-        public static final int MODE_CHECK_LIST = 1;
-
-        // 定义了文本笔记的MIME类型
-        public static final String CONTENT_TYPE = "vnd.android.cursor.dir/text_note";
-        public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/text_note";
-
-        /**
-         * 文本笔记的Uri
-         * 解析为：content://micode_notes/text_note
-         */
-        public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/text_note");
-    }
-
-    // 定义了一个内部类CallNote，继承自DataColumns，表示通话笔记的数据结构
-    public static final class CallNote implements DataColumns {
-        /**
-         * 此记录的通话日期
-         * <P> 类型：INTEGER (long) </P>
-         */
-        public static final String CALL_DATE = DATA1;
-
-        /**
-         * 此记录的电话号码
-         * <P> 类型：TEXT </P>
-         */
-        public static final String PHONE_NUMBER = DATA3;
-
-        // 定义了通话笔记的MIME类型
-        public static final String CONTENT_TYPE = "vnd.android.cursor.dir/call_note";
-        public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/call_note";
-
-        /**
-         * 通话笔记的Uri
-         * 解析为：content://micode_notes/call_note
-         */
-        public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/call_note");
-    }
-}
diff --git a/src/NotesDatabaseHelper.java b/src/NotesDatabaseHelper.java
deleted file mode 100644
index 3674cb6..0000000
--- a/src/NotesDatabaseHelper.java
+++ /dev/null
@@ -1,389 +0,0 @@
-/*
- * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * 你可以在不违反许可协议的情况下使用此文件。
- * 你可以在以下地址获取许可证的副本：
- *
- *        http://www.apache.org/licenses/LICENSE-2.0
- *
- * 除非适用法律要求或书面同意，软件
- * 根据许可证分发是按“原样”基础进行的，
- * 不附带任何明示或暗示的担保或条件。
- * 请参阅许可证以获取特定语言的权限和
- * 限制。
- */
-
-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 是一个 SQLiteOpenHelper 类的子类，用于管理笔记应用的数据库
-public class NotesDatabaseHelper extends SQLiteOpenHelper {
-    // 定义了数据库名称
-    private static final String DB_NAME = "note.db";
-
-    // 定义了数据库版本号
-    private static final int DB_VERSION = 4;
-
-    // 定义了一个内部接口TABLE，包含了表名常量
-    public interface TABLE {
-        public static final String NOTE = "note";  // 笔记表名
-        public static final String DATA = "data";  // 数据表名
-    }
-
-    // 定义了日志标签字符串
-    private static final String TAG = "NotesDatabaseHelper";
-
-    // 定义了单例实例
-    private static NotesDatabaseHelper mInstance;
-
-    // 定义了创建笔记表的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" +
-        ")";
-
-    // 定义了创建 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 ''" +
-        ")";
-
-    // 定义了创建数据表中note_id索引的SQL语句
-    private static final String CREATE_DATA_NOTE_ID_INDEX_SQL =
-        "CREATE INDEX IF NOT EXISTS note_id_index ON " +
-        TABLE.DATA + "(" + DataColumns.NOTE_ID + "); ";
-
-    /**
-     * 当笔记移动到文件夹时，增加文件夹的笔记数量
-     */
-    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";
-
-    /**
-     * 当笔记从文件夹中移除时，减少文件夹的笔记数量
-     */
-    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";
-
-    /**
-     * 当向文件夹中插入新笔记时，增加文件夹的笔记数量
-     */
-    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";
-
-    /**
-     * 当从文件夹中删除笔记时，减少文件夹的笔记数量
-     */
-    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 {@link DataConstants#NOTE} 的数据时，更新笔记的内容
-     */
-    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";
-
-    /**
-     * 当更新类型为 {@link DataConstants#NOTE} 的数据时，更新笔记的内容
-     */
-    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";
-
-    /**
-     * 当删除类型为 {@link DataConstants#NOTE} 的数据时，清空笔记的内容
-     */
-    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";
-
-    /**
-     * 当删除笔记时，删除属于该笔记的所有数据
-     */
-    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";
-
-    /**
-     * 当删除文件夹时，删除属于该文件夹的所有笔记
-     */
-    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";
-
-    /**
-     * 当文件夹被移动到回收站文件夹时，将文件夹中的所有笔记也移动到回收站文件夹
-     */
-    private static final String FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER =
-        "CREATE TRIGGER folder_move_notes_on_trash " +
-        " AFTER UPDATE ON " + TABLE.NOTE +
-        " WHEN new." + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER +
-        " BEGIN" +
-        "  UPDATE " + TABLE.NOTE +
-        "   SET " + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER +
-        "  WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" +
-        " END";
-
-    // 构造函数，初始化数据库帮助器
-    public NotesDatabaseHelper(Context context) {
-        super(context, DB_NAME, null, DB_VERSION);
-    }
-
-    // 创建笔记表的方法
-    public void createNoteTable(SQLiteDatabase db) {
-        db.execSQL(CREATE_NOTE_TABLE_SQL);
-        reCreateNoteTableTriggers(db);
-        createSystemFolder(db);
-        Log.d(TAG, "note table has been created");
-    }
-
-    // 重新创建笔记表触发器的方法
-    private void reCreateNoteTableTriggers(SQLiteDatabase db) {
-        db.execSQL("DROP TRIGGER IF EXISTS increase_folder_count_on_update");
-        db.execSQL("DROP TRIGGER IF EXISTS decrease_folder_count_on_update");
-        db.execSQL("DROP TRIGGER IF EXISTS decrease_folder_count_on_delete");
-        db.execSQL("DROP TRIGGER IF EXISTS delete_data_on_delete");
-        db.execSQL("DROP TRIGGER IF EXISTS increase_folder_count_on_insert");
-        db.execSQL("DROP TRIGGER IF EXISTS folder_delete_notes_on_delete");
-        db.execSQL("DROP TRIGGER IF EXISTS folder_move_notes_on_trash");
-
-        db.execSQL(NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER);
-        db.execSQL(NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER);
-        db.execSQL(NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER);
-        db.execSQL(NOTE_DELETE_DATA_ON_DELETE_TRIGGER);
-        db.execSQL(NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER);
-        db.execSQL(FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER);
-        db.execSQL(FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER);
-    }
-
-    // 创建系统文件夹的方法
-    private void createSystemFolder(SQLiteDatabase db) {
-        ContentValues values = new ContentValues();
-
-        /**
-         * 创建通话记录文件夹，用于存储通话笔记
-         */
-        values.put(NoteColumns.ID, Notes.ID_CALL_RECORD_FOLDER);
-        values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
-        db.insert(TABLE.NOTE, null, values);
-
-        /**
-         * 创建根文件夹，默认文件夹
-         */
-        values.clear();
-        values.put(NoteColumns.ID, Notes.ID_ROOT_FOLDER);
-        values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
-        db.insert(TABLE.NOTE, null, values);
-
-        /**
-         * 创建临时文件夹，用于移动笔记
-         */
-        values.clear();
-        values.put(NoteColumns.ID, Notes.ID_TEMPARAY_FOLDER);
-        values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
-        db.insert(TABLE.NOTE, null, values);
-
-        /**
-         * 创建回收站文件夹
-         */
-        values.clear();
-        values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);
-        values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
-        db.insert(TABLE.NOTE, null, values);
-    }
-
-    // 创建数据表的方法
-    public void createDataTable(SQLiteDatabase db) {
-        db.execSQL(CREATE_DATA_TABLE_SQL);
-        reCreateDataTableTriggers(db);
-        db.execSQL(CREATE_DATA_NOTE_ID_INDEX_SQL);
-        Log.d(TAG, "data table has been created");
-    }
-
-    // 重新创建数据表触发器的方法
-    private void reCreateDataTableTriggers(SQLiteDatabase db) {
-        db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_insert");
-        db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_update");
-        db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_delete");
-
-        db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER);
-        db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER);
-        db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER);
-    }
-
-    // 获取 NotesDatabaseHelper 单例实例的方法
-    static synchronized NotesDatabaseHelper getInstance(Context context) {
-        if (mInstance == null) {
-            mInstance = new NotesDatabaseHelper(context);
-        }
-        return mInstance;
-    }
-
-    // 当数据库第一次创建时调用的方法
-    @Override
-    public void onCreate(SQLiteDatabase db) {
-        createNoteTable(db);
-        createDataTable(db);
-    }
-
-    // 当数据库需要升级时调用的方法
-    @Override
-    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
-        boolean reCreateTriggers = false;
-        boolean skipV2 = false;
-
-        // 如果当前版本是1，直接删除旧表并创建新表
-        if (oldVersion == 1) {
-            upgradeToV2(db);
-            skipV2 = true; // 这次升级包含了从v2到v3的升级
-            oldVersion++;
-        }
-
-        // 如果当前版本是2，添加新的列并创建系统文件夹
-        if (oldVersion == 2 && !skipV2) {
-            upgradeToV3(db);
-            reCreateTriggers = true;
-            oldVersion++;
-        }
-
-        // 如果当前版本是3，添加版本号列
-        if (oldVersion == 3) {
-            upgradeToV4(db);
-            oldVersion++;
-        }
-
-        // 如果需要重新创建触发器，调用相应的方法
-        if (reCreateTriggers) {
-            reCreateNoteTableTriggers(db);
-            reCreateDataTableTriggers(db);
-        }
-
-        // 如果升级失败，抛出异常
-        if (oldVersion != newVersion) {
-            throw new IllegalStateException("Upgrade notes database to version " + newVersion
-                    + " fails");
-        }
-    }
-
-    // 升级到数据库版本2的方法
-    private void upgradeToV2(SQLiteDatabase db) {
-        db.execSQL("DROP TABLE IF EXISTS " + TABLE.NOTE);
-        db.execSQL("DROP TABLE IF EXISTS " + TABLE.DATA);
-        createNoteTable(db);
-        createDataTable(db);
-    }
-
-    // 升级到数据库版本3的方法
-    private void upgradeToV3(SQLiteDatabase db) {
-        // 删除不再使用的触发器
-        db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_insert");
-        db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_delete");
-        db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_update");
-
-        // 添加 gtask id 列
-        db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.GTASK_ID
-                + " TEXT NOT NULL DEFAULT ''");
-
-        // 添加回收站系统文件夹
-        ContentValues values = new ContentValues();
-        values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);
-        values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
-        db.insert(TABLE.NOTE, null, values);
-    }
-
-    // 升级到数据库版本4的方法
-    private void upgradeToV4(SQLiteDatabase db) {
-        // 添加版本号列
-        db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.VERSION
-                + " INTEGER NOT NULL DEFAULT 0");
-    }
-}
diff --git a/src/NotesProvider.java b/src/NotesProvider.java
deleted file mode 100644
index 2cd497c..0000000
--- a/src/NotesProvider.java
+++ /dev/null
@@ -1,342 +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.data;
-
-import android.app.SearchManager;
-import android.content.ContentProvider;
-import android.content.ContentUris;
-import android.content.ContentValues;
-import android.content.Intent;
-import android.content.UriMatcher;
-import android.database.Cursor;
-import android.database.sqlite.SQLiteDatabase;
-import android.net.Uri;
-import android.text.TextUtils;
-import android.util.Log;
-
-import net.micode.notes.R;
-import net.micode.notes.data.Notes.DataColumns;
-import net.micode.notes.data.Notes.NoteColumns;
-import net.micode.notes.data.NotesDatabaseHelper.TABLE;
-
-public class NotesProvider extends ContentProvider {
-    // UriMatcher用于匹配不同的URI请求，返回相应的请求类型
-    private static final UriMatcher mMatcher;
-
-    // 数据库辅助类，用于创建和管理数据库
-    private NotesDatabaseHelper mHelper;
-
-    // 日志标签，便于调试和日志记录
-    private static final String TAG = "NotesProvider";
-
-    // 定义URI请求类型常量
-    private static final int URI_NOTE            = 1;
-    private static final int URI_NOTE_ITEM       = 2;
-    private static final int URI_DATA            = 3;
-    private static final int URI_DATA_ITEM       = 4;
-
-    private static final int URI_SEARCH          = 5;
-    private static final int URI_SEARCH_SUGGEST  = 6;
-
-    // 静态代码块，在类加载时初始化UriMatcher
-    static {
-        mMatcher = new UriMatcher(UriMatcher.NO_MATCH);
-        mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE);
-        mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM);
-        mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA);
-        mMatcher.addURI(Notes.AUTHORITY, "data/#", URI_DATA_ITEM);
-        mMatcher.addURI(Notes.AUTHORITY, "search", URI_SEARCH);
-        mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY, URI_SEARCH_SUGGEST);
-        mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY + "/*", URI_SEARCH_SUGGEST);
-    }
-
-    /**
-     * x'0A'表示在sqlite中的'\n'字符。对于搜索结果中的标题和内容，
-     * 我们将修剪'\n'和空白字符，以便显示更多信息。
-     */
-    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查询语句，用于根据搜索字符串查询笔记片段
-    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时调用，初始化NotesDatabaseHelper
-    @Override
-    public boolean onCreate() {
-        mHelper = NotesDatabaseHelper.getInstance(getContext());
-        return true;
-    }
-
-    // 根据不同的URI请求类型执行查询操作
-    @Override
-    public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
-            String sortOrder) {
-        Cursor c = null;
-        SQLiteDatabase db = mHelper.getReadableDatabase();
-        String id = null;
-        switch (mMatcher.match(uri)) {
-            case URI_NOTE:
-                // 查询所有笔记
-                c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null,
-                        sortOrder);
-                break;
-            case URI_NOTE_ITEM:
-                // 查询特定ID的笔记
-                id = uri.getPathSegments().get(1);
-                c = db.query(TABLE.NOTE, projection, NoteColumns.ID + "=" + id
-                        + parseSelection(selection), selectionArgs, null, null, sortOrder);
-                break;
-            case URI_DATA:
-                // 查询所有笔记数据
-                c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null,
-                        sortOrder);
-                break;
-            case URI_DATA_ITEM:
-                // 查询特定ID的笔记数据
-                id = uri.getPathSegments().get(1);
-                c = db.query(TABLE.DATA, projection, DataColumns.ID + "=" + id
-                        + parseSelection(selection), selectionArgs, null, null, sortOrder);
-                break;
-            case URI_SEARCH:
-            case URI_SEARCH_SUGGEST:
-                // 搜索时不允许指定排序条件、选择条件、选择参数或投影
-                if (sortOrder != null || projection != null) {
-                    throw new IllegalArgumentException(
-                            "不允许在搜索时指定排序条件、选择条件、选择参数或投影");
-                }
-
-                String searchString = null;
-                // 获取搜索字符串
-                if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) {
-                    if (uri.getPathSegments().size() > 1) {
-                        searchString = uri.getPathSegments().get(1);
-                    }
-                } else {
-                    searchString = uri.getQueryParameter("pattern");
-                }
-
-                // 如果搜索字符串为空，返回null
-                if (TextUtils.isEmpty(searchString)) {
-                    return null;
-                }
-
-                try {
-                    // 格式化搜索字符串，使其可以用于LIKE查询
-                    searchString = String.format("%%%s%%", searchString);
-                    // 执行搜索查询
-                    c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY,
-                            new String[] { searchString });
-                } catch (IllegalStateException ex) {
-                    Log.e(TAG, "发生异常: " + ex.toString());
-                }
-                break;
-            default:
-                // 如果URI请求类型未知，抛出异常
-                throw new IllegalArgumentException("未知的URI " + uri);
-        }
-        // 设置游标的通知URI，以便内容变化时通知监听者
-        if (c != null) {
-            c.setNotificationUri(getContext().getContentResolver(), uri);
-        }
-        return c;
-    }
-
-    // 根据不同的URI请求类型插入数据
-    @Override
-    public Uri insert(Uri uri, ContentValues values) {
-        SQLiteDatabase db = mHelper.getWritableDatabase();
-        long dataId = 0, noteId = 0, insertedId = 0;
-        switch (mMatcher.match(uri)) {
-            case URI_NOTE:
-                // 插入新的笔记
-                insertedId = noteId = db.insert(TABLE.NOTE, null, values);
-                break;
-            case URI_DATA:
-                // 插入新的笔记数据
-                if (values.containsKey(DataColumns.NOTE_ID)) {
-                    noteId = values.getAsLong(DataColumns.NOTE_ID);
-                } else {
-                    Log.d(TAG, "数据格式错误，缺少笔记ID:" + values.toString());
-                }
-                insertedId = dataId = db.insert(TABLE.DATA, null, values);
-                break;
-            default:
-                // 如果URI请求类型未知，抛出异常
-                throw new IllegalArgumentException("未知的URI " + uri);
-        }
-        // 通知笔记URI变化
-        if (noteId > 0) {
-            getContext().getContentResolver().notifyChange(
-                    ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null);
-        }
-
-        // 通知数据URI变化
-        if (dataId > 0) {
-            getContext().getContentResolver().notifyChange(
-                    ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null);
-        }
-
-        return ContentUris.withAppendedId(uri, insertedId);
-    }
-
-    // 根据不同的URI请求类型删除数据
-    @Override
-    public int delete(Uri uri, String selection, String[] selectionArgs) {
-        int count = 0;
-        String id = null;
-        SQLiteDatabase db = mHelper.getWritableDatabase();
-        boolean deleteData = false;
-        switch (mMatcher.match(uri)) {
-            case URI_NOTE:
-                // 删除笔记时，确保ID大于0
-                selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 ";
-                count = db.delete(TABLE.NOTE, selection, selectionArgs);
-                break;
-            case URI_NOTE_ITEM:
-                id = uri.getPathSegments().get(1);
-                long noteId = Long.valueOf(id);
-                // ID小于等于0的笔记为系统文件夹，不允许删除
-                if (noteId <= 0) {
-                    break;
-                }
-                // 删除特定ID的笔记
-                count = db.delete(TABLE.NOTE,
-                        NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
-                break;
-            case URI_DATA:
-                // 删除笔记数据
-                count = db.delete(TABLE.DATA, selection, selectionArgs);
-                deleteData = true;
-                break;
-            case URI_DATA_ITEM:
-                id = uri.getPathSegments().get(1);
-                // 删除特定ID的笔记数据
-                count = db.delete(TABLE.DATA,
-                        DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
-                deleteData = true;
-                break;
-            default:
-                // 如果URI请求类型未知，抛出异常
-                throw new IllegalArgumentException("未知的URI " + uri);
-        }
-        // 如果有数据被删除，通知URI变化
-        if (count > 0) {
-            if (deleteData) {
-                getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
-            }
-            getContext().getContentResolver().notifyChange(uri, null);
-        }
-        return count;
-    }
-
-    // 根据不同的URI请求类型更新数据
-    @Override
-    public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
-        int count = 0;
-        String id = null;
-        SQLiteDatabase db = mHelper.getWritableDatabase();
-        boolean updateData = false;
-        switch (mMatcher.match(uri)) {
-            case URI_NOTE:
-                // 更新笔记时，增加笔记版本号
-                increaseNoteVersion(-1, selection, selectionArgs);
-                count = db.update(TABLE.NOTE, values, selection, selectionArgs);
-                break;
-            case URI_NOTE_ITEM:
-                id = uri.getPathSegments().get(1);
-                long noteId = Long.valueOf(id);
-                // 更新特定ID的笔记，并增加笔记版本号
-                increaseNoteVersion(noteId, selection, selectionArgs);
-                count = db.update(TABLE.NOTE, values, NoteColumns.ID + "=" + id
-                        + parseSelection(selection), selectionArgs);
-                break;
-            case URI_DATA:
-                // 更新笔记数据
-                count = db.update(TABLE.DATA, values, selection, selectionArgs);
-                updateData = true;
-                break;
-            case URI_DATA_ITEM:
-                id = uri.getPathSegments().get(1);
-                // 更新特定ID的笔记数据
-                count = db.update(TABLE.DATA, values, DataColumns.ID + "=" + id
-                        + parseSelection(selection), selectionArgs);
-                updateData = true;
-                break;
-            default:
-                // 如果URI请求类型未知，抛出异常
-                throw new IllegalArgumentException("未知的URI " + uri);
-        }
-
-        // 如果有数据被更新，通知URI变化
-        if (count > 0) {
-            if (updateData) {
-                getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
-            }
-            getContext().getContentResolver().notifyChange(uri, null);
-        }
-        return count;
-    }
-
-    // 解析选择条件字符串，如果存在选择条件，则添加到SQL查询中
-    private String parseSelection(String selection) {
-        return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : "");
-    }
-
-    // 增加笔记版本号
-    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 ");
-
-        // 构建WHERE子句
-        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);
-        }
-
-        // 执行更新操作
-        mHelper.getWritableDatabase().execSQL(sql.toString());
-    }
-
-    // 返回URI对应的数据类型，这里未实现，返回null
-    @Override
-    public String getType(Uri uri) {
-        // TODO Auto-generated method stub
-        return null;
-    }
-}
diff --git a/src/net/micode/notes/data/Contact.java b/src/net/micode/notes/data/Contact.java
index d97ac5d..b9b793b 100644
--- a/src/net/micode/notes/data/Contact.java
+++ b/src/net/micode/notes/data/Contact.java
@@ -16,56 +16,70 @@
 
 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 android.content.Context; // 导入Android上下文类，用于访问系统资源
+import android.database.Cursor; // 导入Android游标类，用于查询数据库
+import android.provider.ContactsContract.CommonDataKinds.Phone; // 导入Android联系人电话信息类
+import android.provider.ContactsContract.Data; // 导入Android联系人数据类
+import android.telephony.PhoneNumberUtils; // 导入Android电话号码工具类
+import android.util.Log; // 导入Android日志工具类
 
-import java.util.HashMap;
+import java.util.HashMap; // 导入Java哈希表类，用于缓存查询结果
 
 public class Contact {
+    // 静态的哈希表，用于缓存电话号码和对应的联系人姓名
     private static HashMap<String, String> sContactCache;
+    // 日志标签，用于在日志中标识来自该类的消息
     private static final String TAG = "Contact";
 
+    // SQL查询条件，用于查找与给定电话号码匹配的联系人信息
+    // 使用PHONE_NUMBERS_EQUAL函数比较电话号码，确保号码格式的一致性
+    // 限制数据类型为电话号码类型，并通过子查询确保电话号码的最小匹配字符为'+'
     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 "
+            + ",?) AND " + Data.MIMETYPE + "='" + Phone.CONTENT_ITEM_TYPE + "'"
+            + " AND " + Data.RAW_CONTACT_ID + " IN "
             + "(SELECT raw_contact_id "
             + " FROM phone_lookup"
             + " WHERE min_match = '+')";
 
+    // 根据给定的电话号码获取联系人的姓名
     public static String getContact(Context context, String phoneNumber) {
+        // 如果缓存为空，则初始化缓存
         if(sContactCache == null) {
             sContactCache = new HashMap<String, String>();
         }
 
+        // 检查缓存中是否已有该电话号码对应的联系人姓名
         if(sContactCache.containsKey(phoneNumber)) {
-            return sContactCache.get(phoneNumber);
+            return sContactCache.get(phoneNumber); // 如果存在，则直接返回缓存中的姓名
         }
 
+        // 构造SQL查询条件，将占位符"+"替换为电话号码的最小匹配字符
         String selection = CALLER_ID_SELECTION.replace("+",
                 PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));
+
+        // 执行数据库查询，获取与电话号码匹配的联系人姓名
         Cursor cursor = context.getContentResolver().query(
-                Data.CONTENT_URI,
-                new String [] { Phone.DISPLAY_NAME },
-                selection,
-                new String[] { phoneNumber },
-                null);
+                Data.CONTENT_URI, // 查询联系人数据表
+                new String [] { Phone.DISPLAY_NAME }, // 需要查询的字段：联系人显示名称
+                selection, // 查询条件
+                new String[] { phoneNumber }, // 查询条件中的占位符参数
+                null); // 排序条件，这里为null表示不排序
 
+        // 检查查询结果是否为空且是否可以移动到第一行
         if (cursor != null && cursor.moveToFirst()) {
             try {
-                String name = cursor.getString(0);
-                sContactCache.put(phoneNumber, name);
-                return name;
+                String name = cursor.getString(0); // 获取联系人显示名称
+                sContactCache.put(phoneNumber, name); // 将查询结果存入缓存
+                return name; // 返回联系人姓名
             } catch (IndexOutOfBoundsException e) {
+                // 如果发生数组越界异常，记录错误日志并返回null
                 Log.e(TAG, " Cursor get string error " + e.toString());
                 return null;
             } finally {
-                cursor.close();
+                cursor.close(); // 关闭游标，释放资源
             }
         } else {
+            // 如果没有找到匹配的联系人，记录调试日志并返回null
             Log.d(TAG, "No contact matched with number:" + phoneNumber);
             return null;
         }
diff --git a/src/net/micode/notes/data/GClient.java b/src/net/micode/notes/data/GClient.java
new file mode 100644
index 0000000..64f4a48
--- /dev/null
+++ b/src/net/micode/notes/data/GClient.java
@@ -0,0 +1,650 @@
+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，包括登录、创建任务、创建任务列表、移动任务以及删除节点等操作。
+ */
+public class GTaskClient {
+    private static final String TAG = GTaskClient.class.getSimpleName(); // 日志标签
+
+    private static final String GTASK_URL = "https://mail.google.com/tasks/"; // Google Tasks的基本URL
+    private static final String GTASK_GET_URL = "https://mail.google.com/tasks/ig"; // 获取数据的URL
+    private static final String GTASK_POST_URL = "https://mail.google.com/tasks/r/ig"; // 提交数据的URL
+
+    private static GTaskClient mInstance = null; // 单例实例
+    private DefaultHttpClient mHttpClient; // HTTP客户端
+    private String mGetUrl; // 获取数据的具体URL
+    private String mPostUrl; // 提交数据的具体URL
+    private long mClientVersion; // 客户端版本号
+    private boolean mLoggedin; // 是否已登录
+    private long mLastLoginTime; // 上次登录时间
+    private int mActionId; // 操作ID
+    private Account mAccount; // 当前使用的账户
+    private JSONArray mUpdateArray; // 更新操作列表
+
+    /**
+     * 私有构造函数，用于初始化GTaskClient对象。
+     */
+    private GTaskClient() {
+        mHttpClient = null;
+        mGetUrl = GTASK_GET_URL;
+        mPostUrl = GTASK_POST_URL;
+        mClientVersion = -1;
+        mLoggedin = false;
+        mLastLoginTime = 0;
+        mActionId = 1;
+        mAccount = null;
+        mUpdateArray = null;
+    }
+
+    /**
+     * 获取GTaskClient的单例实例。
+     * @return GTaskClient的单例实例
+     */
+    public static synchronized GTaskClient getInstance() {
+        if (mInstance == null) {
+            mInstance = new GTaskClient();
+        }
+        return mInstance;
+    }
+
+    /**
+     * 登录Google账户，如果需要则重新登录。
+     * @param activity 当前的Activity实例
+     * @return 如果登录成功则返回true，否则返回false
+     */
+    public boolean login(Activity activity) {
+        // 设置cookie过期时间为5分钟，如果超过这个时间则重新登录
+        final long interval = 1000 * 60 * 5;
+        if (mLastLoginTime + interval < System.currentTimeMillis()) {
+            mLoggedin = false;
+        }
+
+        // 如果账户发生切换，则需要重新登录
+        if (mLoggedin
+                && !TextUtils.equals(getSyncAccount().name, NotesPreferenceActivity
+                        .getSyncAccountName(activity))) {
+            mLoggedin = false;
+        }
+
+        // 如果已经登录，直接返回true
+        if (mLoggedin) {
+            Log.d(TAG, "already logged in");
+            return true;
+        }
+
+        mLastLoginTime = System.currentTimeMillis(); // 更新上次登录时间
+        String authToken = loginGoogleAccount(activity, false); // 获取认证令牌
+        if (authToken == null) {
+            Log.e(TAG, "login google account failed");
+            return false;
+        }
+
+        // 如果账户不在gmail.com或googlemail.com域中，则尝试使用自定义域名登录
+        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; // 登录成功
+        return true;
+    }
+
+    /**
+     * 登录Google账户，获取认证令牌。
+     * @param activity 当前的Activity实例
+     * @param invalidateToken 是否使当前令牌失效
+     * @return 认证令牌字符串
+     */
+    private String loginGoogleAccount(Activity activity, boolean invalidateToken) {
+        String authToken;
+        AccountManager accountManager = AccountManager.get(activity); // 获取AccountManager实例
+        Account[] accounts = accountManager.getAccountsByType("com.google"); // 获取所有Google账户
+
+        if (accounts.length == 0) { // 没有可用的Google账户
+            Log.e(TAG, "there is no available google account");
+            return null;
+        }
+
+        String accountName = NotesPreferenceActivity.getSyncAccountName(activity); // 获取设置中的同步账户名称
+        Account account = null;
+        for (Account a : accounts) {
+            if (a.name.equals(accountName)) { // 找到匹配的账户
+                account = a;
+                break;
+            }
+        }
+        if (account != null) {
+            mAccount = account; // 设置当前账户
+        } else {
+            Log.e(TAG, "unable to get an account with the same name in the settings");
+            return null;
+        }
+
+        // 获取认证令牌
+        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) { // 如果需要使令牌失效
+                accountManager.invalidateAuthToken("com.google", authToken);
+                loginGoogleAccount(activity, false); // 重新登录
+            }
+        } catch (Exception e) {
+            Log.e(TAG, "get auth token failed");
+            authToken = null;
+        }
+
+        return authToken;
+    }
+
+    /**
+     * 尝试登录Google Tasks。
+     * @param activity 当前的Activity实例
+     * @param authToken 认证令牌
+     * @return 如果登录成功则返回true，否则返回false
+     */
+    private boolean tryToLoginGtask(Activity activity, String authToken) {
+        if (!loginGtask(authToken)) {
+            // 如果登录失败，可能是令牌过期，使令牌失效后再次尝试
+            authToken = loginGoogleAccount(activity, true);
+            if (authToken == null) {
+                Log.e(TAG, "login google account failed");
+                return false;
+            }
+
+            if (!loginGtask(authToken)) {
+                Log.e(TAG, "login gtask failed");
+                return false;
+            }
+        }
+        return true;
+    }
+
+    /**
+     * 使用给定的认证令牌登录Google Tasks。
+     * @param authToken 认证令牌
+     * @return 如果登录成功则返回true，否则返回false
+     */
+    private boolean loginGtask(String authToken) {
+        int timeoutConnection = 10000; // 连接超时时间
+        int timeoutSocket = 15000; // 套接字超时时间
+        HttpParams httpParameters = new BasicHttpParams(); // HTTP参数
+        HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection); // 设置连接超时时间
+        HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket); // 设置套接字超时时间
+        mHttpClient = new DefaultHttpClient(httpParameters); // 创建HTTP客户端
+        BasicCookieStore localBasicCookieStore = new BasicCookieStore(); // 创建Cookie存储
+        mHttpClient.setCookieStore(localBasicCookieStore); // 设置Cookie存储
+        HttpProtocolParams.setUseExpectContinue(mHttpClient.getParams(), false); // 设置使用Expect Continue
+
+        // 登录Google Tasks
+        try {
+            String loginUrl = mGetUrl + "?auth=" + authToken; // 构建登录URL
+            HttpGet httpGet = new HttpGet(loginUrl); // 创建HttpGet请求
+            HttpResponse response = mHttpClient.execute(httpGet); // 执行请求
+
+            // 获取认证cookie
+            List<Cookie> cookies = mHttpClient.getCookieStore().getCookies();
+            boolean hasAuthCookie = false;
+            for (Cookie cookie : cookies) {
+                if (cookie.getName().contains("GTL")) { // 检查是否存在认证cookie
+                    hasAuthCookie = true;
+                }
+            }
+            if (!hasAuthCookie) {
+                Log.w(TAG, "it seems that there is no auth cookie");
+            }
+
+            // 获取客户端版本号
+            String resString = getResponseContent(response.getEntity()); // 获取响应内容
+            String jsBegin = "_setup("; // JSON数据开始标记
+            String jsEnd = ")}</script>"; // JSON数据结束标记
+            int begin = resString.indexOf(jsBegin); // 查找开始标记
+            int end = resString.lastIndexOf(jsEnd); // 查找结束标记
+            String jsString = null;
+            if (begin != -1 && end != -1 && begin < end) {
+                jsString = resString.substring(begin + jsBegin.length(), end); // 提取JSON字符串
+            }
+            JSONObject js = new JSONObject(jsString); // 将JSON字符串转换为JSONObject
+            mClientVersion = js.getLong("v"); // 获取客户端版本号
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            return false;
+        } catch (Exception e) {
+            Log.e(TAG, "httpget gtask_url failed");
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * 获取下一个操作ID。
+     * @return 下一个操作ID
+     */
+    private int getActionId() {
+        return mActionId++;
+    }
+
+    /**
+     * 创建一个HttpPost请求。
+     * @return HttpPost请求对象
+     */
+    private HttpPost createHttpPost() {
+        HttpPost httpPost = new HttpPost(mPostUrl); // 创建HttpPost请求
+        httpPost.setHeader("Content-Type", "application/x-www-form-urlencoded;charset=utf-8"); // 设置请求头
+        httpPost.setHeader("AT", "1");
+        return httpPost;
+    }
+
+    /**
+     * 获取HTTP响应内容。
+     * @param entity HTTP响应实体
+     * @return 响应内容字符串
+     * @throws IOException 如果发生IO错误
+     */
+    private String getResponseContent(HttpEntity entity) throws IOException {
+        String contentEncoding = null;
+        if (entity.getContentEncoding() != null) {
+            contentEncoding = entity.getContentEncoding().getValue(); // 获取内容编码
+            Log.d(TAG, "encoding: " + contentEncoding);
+        }
+
+        InputStream input = entity.getContent(); // 获取输入流
+        if (contentEncoding != null && contentEncoding.equalsIgnoreCase("gzip")) { // 如果是gzip编码
+            input = new GZIPInputStream(entity.getContent()); // 使用GZIPInputStream解码
+        } else if (contentEncoding != null && contentEncoding.equalsIgnoreCase("deflate")) { // 如果是deflate编码
+            Inflater inflater = new Inflater(true);
+            input = new InflaterInputStream(entity.getContent(), inflater); // 使用InflaterInputStream解码
+        }
+
+        try {
+            InputStreamReader isr = new InputStreamReader(input); // 创建InputStreamReader
+            BufferedReader br = new BufferedReader(isr); // 创建BufferedReader
+            StringBuilder sb = new StringBuilder();
+
+            // 读取响应内容
+            String buff;
+            while ((buff = br.readLine()) != null) {
+                sb.append(buff); // 将每一行内容追加到StringBuilder中
+            }
+            return sb.toString();
+        } finally {
+            input.close(); // 关闭输入流
+        }
+    }
+
+    /**
+     * 提交一个POST请求到Google Tasks。
+     * @param js 包含操作的JSONObject
+     * @return 服务器返回的JSONObject
+     * @throws NetworkFailureException 如果发生网络错误
+     */
+    private JSONObject postRequest(JSONObject js) throws NetworkFailureException {
+        if (!mLoggedin) {
+            Log.e(TAG, "please login first");
+            throw new ActionFailureException("not logged in"); // 如果未登录，抛出异常
+        }
+
+        HttpPost httpPost = createHttpPost(); // 创建HttpPost请求
+        try {
+            LinkedList<BasicNameValuePair> list = new LinkedList<BasicNameValuePair>();
+            list.add(new BasicNameValuePair("r", js.toString())); // 将JSONObject转换为字符串并添加到请求参数中
+            UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list, "UTF-8"); // 创建UrlEncodedFormEntity
+            httpPost.setEntity(entity); // 设置请求实体
+
+            // 执行POST请求
+            HttpResponse response = mHttpClient.execute(httpPost);
+            String jsString = getResponseContent(response.getEntity()); // 获取响应内容
+            return new JSONObject(jsString); // 将响应内容转换为JSONObject
+
+        } catch (ClientProtocolException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new NetworkFailureException("postRequest failed"); // 如果发生协议错误，抛出异常
+        } catch (IOException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new NetworkFailureException("postRequest failed"); // 如果发生IO错误，抛出异常
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("unable to convert response content to jsonobject"); // 如果无法将响应内容转换为JSONObject，抛出异常
+        } catch (Exception e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("error occurs when posting request"); // 如果发生其他错误，抛出异常
+        }
+    }
+
+    /**
+     * 创建一个新的任务。
+     * @param task 要创建的任务对象
+     * @throws NetworkFailureException 如果发生网络错误
+     */
+    public void createTask(Task task) throws NetworkFailureException {
+        commitUpdate(); // 提交所有待更新的操作
+        try {
+            JSONObject jsPost = new JSONObject();
+            JSONArray actionList = new JSONArray();
+
+            // 添加创建任务的操作
+            actionList.put(task.getCreateAction(getActionId()));
+            jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList);
+
+            // 设置客户端版本号
+            jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
+
+            // 提交POST请求
+            JSONObject jsResponse = postRequest(jsPost);
+            JSONObject jsResult = (JSONObject) jsResponse.getJSONArray(
+                    GTaskStringUtils.GTASK_JSON_RESULTS).get(0); // 获取响应结果
+            task.setGid(jsResult.getString(GTaskStringUtils.GTASK_JSON_NEW_ID)); // 设置任务ID
+
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("create task: handing jsonobject failed"); // 如果发生JSON处理错误，抛出异常
+        }
+    }
+
+    /**
+     * 创建一个新的任务列表。
+     * @param tasklist 要创建的任务列表对象
+     * @throws NetworkFailureException 如果发生网络错误
+     */
+    public void createTaskList(TaskList tasklist) throws NetworkFailureException {
+        commitUpdate(); // 提交所有待更新的操作
+        try {
+            JSONObject jsPost = new JSONObject();
+            JSONArray actionList = new JSONArray();
+
+            // 添加创建任务列表的操作
+            actionList.put(tasklist.getCreateAction(getActionId()));
+            jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList);
+
+            // 设置客户端版本号
+            jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
+
+            // 提交POST请求
+            JSONObject jsResponse = postRequest(jsPost);
+            JSONObject jsResult = (JSONObject) jsResponse.getJSONArray(
+                    GTaskStringUtils.GTASK_JSON_RESULTS).get(0); // 获取响应结果
+            tasklist.setGid(jsResult.getString(GTaskStringUtils.GTASK_JSON_NEW_ID)); // 设置任务列表ID
+
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("create tasklist: handing jsonobject failed"); // 如果发生JSON处理错误，抛出异常
+        }
+    }
+
+    /**
+     * 提交所有待更新的操作。
+     * @throws NetworkFailureException 如果发生网络错误
+     */
+    public void commitUpdate() throws NetworkFailureException {
+        if (mUpdateArray != null) { // 如果有待更新的操作
+            try {
+                JSONObject jsPost = new JSONObject();
+
+                // 设置操作列表
+                jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, mUpdateArray);
+
+                // 设置客户端版本号
+                jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
+
+                postRequest(jsPost); // 提交POST请求
+                mUpdateArray = null; // 清空待更新的操作列表
+            } catch (JSONException e) {
+                Log.e(TAG, e.toString());
+                e.printStackTrace();
+                throw new ActionFailureException("commit update: handing jsonobject failed"); // 如果发生JSON处理错误，抛出异常
+            }
+        }
+    }
+
+    /**
+     * 添加一个更新操作到待更新的操作列表中。
+     * @param node 要更新的节点对象
+     * @throws NetworkFailureException 如果发生网络错误
+     */
+    public void addUpdateNode(Node node) throws NetworkFailureException {
+        if (node != null) {
+            // 如果待更新的操作数量超过10个，则先提交这些操作
+            if (mUpdateArray != null && mUpdateArray.length() > 10) {
+                commitUpdate();
+            }
+
+            if (mUpdateArray == null) {
+                mUpdateArray = new JSONArray(); // 如果操作列表为空，则创建一个新的JSONArray
+            }
+            mUpdateArray.put(node.getUpdateAction(getActionId())); // 将节点的更新操作添加到操作列表中
+        }
+    }
+
+    /**
+     * 将一个任务移动到另一个任务列表。
+     * @param task 要移动的任务对象
+     * @param preParent 任务原来的父任务列表
+     * @param curParent 任务要移动到的目标任务列表
+     * @throws NetworkFailureException 如果发生网络错误
+     */
+    public void moveTask(Task task, TaskList preParent, TaskList curParent)
+            throws NetworkFailureException {
+        commitUpdate(); // 提交所有待更新的操作
+        try {
+            JSONObject jsPost = new JSONObject();
+            JSONArray actionList = new JSONArray();
+            JSONObject action = new JSONObject();
+
+            // 构建移动任务的操作
+            action.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE, GTaskStringUtils.GTASK_JSON_ACTION_TYPE_MOVE);
+            action.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, getActionId());
+            action.put(GTaskStringUtils.GTASK_JSON_ID, task.getGid());
+            if (preParent == curParent && task.getPriorSibling() != null) {
+                // 如果在同一个列表中移动，并且不是第一个任务，则设置前一个兄弟节点ID
+                action.put(GTaskStringUtils.GTASK_JSON_PRIOR_SIBLING_ID, task.getPriorSibling());
+            }
+            action.put(GTaskStringUtils.GTASK_JSON_SOURCE_LIST, preParent.getGid());
+            action.put(GTaskStringUtils.GTASK_JSON_DEST_PARENT, curParent.getGid());
+            if (preParent != curParent) {
+                // 如果移动到不同的列表，则设置目标列表ID
+                action.put(GTaskStringUtils.GTASK_JSON_DEST_LIST, curParent.getGid());
+            }
+            actionList.put(action); // 将操作添加到操作列表中
+            jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList);
+
+            // 设置客户端版本号
+            jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
+
+            postRequest(jsPost); // 提交POST请求
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("move task: handing jsonobject failed"); // 如果发生JSON处理错误，抛出异常
+        }
+    }
+
+    /**
+     * 删除一个节点。
+     * @param node 要删除的节点对象
+     * @throws NetworkFailureException 如果发生网络错误
+     */
+    public void deleteNode(Node node) throws NetworkFailureException {
+        commitUpdate(); // 提交所有待更新的操作
+        try {
+            JSONObject jsPost = new JSONObject();
+            JSONArray actionList = new JSONArray();
+
+            // 构建删除节点的操作
+            node.setDeleted(true);
+            actionList.put(node.getUpdateAction(getActionId()));
+            jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList);
+
+            // 设置客户端版本号
+            jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
+
+            postRequest(jsPost); // 提交POST请求
+            mUpdateArray = null; // 清空待更新的操作列表
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("delete node: handing jsonobject failed"); // 如果发生JSON处理错误，抛出异常
+        }
+    }
+
+    /**
+     * 获取所有任务列表。
+     * @return 包含所有任务列表的JSONArray
+     * @throws NetworkFailureException 如果发生网络错误
+     */
+    public JSONArray getTaskLists() throws NetworkFailureException {
+        if (!mLoggedin) {
+            Log.e(TAG, "please login first");
+            throw new ActionFailureException("not logged in"); // 如果未登录，抛出异常
+        }
+
+        try {
+            HttpGet httpGet = new HttpGet(mGetUrl); // 创建HttpGet请求
+            HttpResponse response = mHttpClient.execute(httpGet); // 执行请求
+
+            // 获取任务列表数据
+            String resString = getResponseContent(response.getEntity()); // 获取响应内容
+            String jsBegin = "_setup("; // JSON数据开始标记
+            String jsEnd = ")}</script>"; // JSON数据结束标记
+            int begin = resString.indexOf(jsBegin); // 查找开始标记
+            int end = resString.lastIndexOf(jsEnd); // 查找结束标记
+            String jsString = null;
+            if (begin != -1 && end != -1 && begin < end) {
+                jsString = resString.substring(begin + jsBegin.length(), end); // 提取JSON字符串
+            }
+            JSONObject js = new JSONObject(jsString); // 将JSON字符串转换为JSONObject
+            return js.getJSONObject("t").getJSONArray(GTaskStringUtils.GTASK_JSON_LISTS); // 获取任务列表数组
+        } catch (ClientProtocolException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new NetworkFailureException("gettasklists: httpget failed"); // 如果发生协议错误，抛出异常
+        } catch (IOException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new NetworkFailureException("gettasklists: httpget failed"); // 如果发生IO错误，抛出异常
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("get task lists: handing jasonobject failed"); // 如果发生JSON处理错误，抛出异常
+        }
+    }
+
+    /**
+     * 获取指定ID的任务列表中的所有任务。
+     * @param listGid 任务列表的ID
+     * @return 包含指定任务列表中所有任务的JSONArray
+     * @throws NetworkFailureException 如果发生网络错误
+     */
+    public JSONArray getTaskList(String listGid) throws NetworkFailureException {
+        commitUpdate(); // 提交所有待更新的操作
+        try {
+            JSONObject jsPost = new JSONObject();
+            JSONArray actionList = new JSONArray();
+            JSONObject action = new JSONObject();
+
+            // 构建获取任务列表的操作
+            action.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE, GTaskStringUtils.GTASK_JSON_ACTION_TYPE_GETALL);
+            action.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, getActionId());
+            action.put(GTaskStringUtils.GTASK_JSON_LIST_ID, listGid);
+            action.put(GTaskStringUtils.GTASK_JSON_GET_DELETED, false);
+            actionList.put(action);
+            jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList);
+
+            // 设置客户端版本号
+            jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
+
+            // 提交POST请求
+            JSONObject jsResponse = postRequest(jsPost);
+            return jsResponse.getJSONArray(GTaskStringUtils.GTASK_JSON_TASKS); // 获取任务数组
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("get task list: handing jsonobject failed"); // 如果发生JSON处理错误，抛出异常
+        }
+    }
+
+    /**
+     * 获取当前同步的账户。
+     * @return 当前同步的账户对象
+     */
+    public Account getSyncAccount() {
+        return mAccount;
+    }
+
+    /**
+     * 重置待更新的操作列表。
+     */
+    public void resetUpdateArray() {
+        mUpdateArray = null;
+    }
+}
diff --git a/src/net/micode/notes/data/GTask.java b/src/net/micode/notes/data/GTask.java
new file mode 100644
index 0000000..d6f49f3
--- /dev/null
+++ b/src/net/micode/notes/data/GTask.java
@@ -0,0 +1,851 @@
+/*
+ * 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 Tasks 的同步操作。
+ */
+public class GTaskManager {
+    private static final String TAG = GTaskManager.class.getSimpleName();
+
+    public static final int STATE_SUCCESS = 0; // 同步成功
+    public static final int STATE_NETWORK_ERROR = 1; // 网络错误
+    public static final int STATE_INTERNAL_ERROR = 2; // 内部错误
+    public static final int STATE_SYNC_IN_PROGRESS = 3; // 同步进行中
+    public static final int STATE_SYNC_CANCELLED = 4; // 同步被取消
+
+    private static GTaskManager mInstance = null; // 单例实例
+
+    private Activity mActivity; // 用于获取认证 token 的 Activity 上下文
+    private Context mContext; // 应用上下文
+    private ContentResolver mContentResolver; // 内容解析器
+    private boolean mSyncing; // 标记同步是否正在进行
+    private boolean mCancelled; // 标记同步是否被取消
+
+    private HashMap<String, TaskList> mGTaskListHashMap; // 存储 Google Tasks 列表的映射
+    private HashMap<String, Node> mGTaskHashMap; // 存储 Google Tasks 的映射
+    private HashMap<String, MetaData> mMetaHashMap; // 存储元数据的映射
+    private TaskList mMetaList; // 元数据列表
+    private HashSet<Long> mLocalDeleteIdMap; // 存储本地删除的笔记 ID
+    private HashMap<String, Long> mGidToNid; // Google ID 到本地 ID 的映射
+    private HashMap<Long, String> mNidToGid; // 本地 ID 到 Google ID 的映射
+
+    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。
+     * @return GTaskManager 的实例
+     */
+    public static synchronized GTaskManager getInstance() {
+        if (mInstance == null) {
+            mInstance = new GTaskManager();
+        }
+        return mInstance;
+    }
+
+    /**
+     * 设置 Activity 上下文，用于获取认证 token。
+     * @param activity 当前的 Activity
+     */
+    public synchronized void setActivityContext(Activity activity) {
+        mActivity = activity;
+    }
+
+    /**
+     * 启动同步操作。
+     * @param context 应用上下文
+     * @param asyncTask 异步任务对象，用于更新同步进度
+     * @return 同步状态码
+     */
+    public int sync(Context context, GTaskASyncTask asyncTask) {
+        if (mSyncing) {
+            Log.d(TAG, "Sync is in progress");
+            return STATE_SYNC_IN_PROGRESS;
+        }
+        mContext = context;
+        mContentResolver = mContext.getContentResolver();
+        mSyncing = true;
+        mCancelled = false;
+        mGTaskListHashMap.clear();
+        mGTaskHashMap.clear();
+        mMetaHashMap.clear();
+        mLocalDeleteIdMap.clear();
+        mGidToNid.clear();
+        mNidToGid.clear();
+
+        try {
+            GTaskClient client = GTaskClient.getInstance();
+            client.resetUpdateArray();
+
+            // 登录 Google Tasks
+            if (!mCancelled) {
+                if (!client.login(mActivity)) {
+                    throw new NetworkFailureException("登录 Google Tasks 失败");
+                }
+            }
+
+            // 获取 Google 的任务列表
+            asyncTask.publishProgess(mContext.getString(R.string.sync_progress_init_list));
+            initGTaskList();
+
+            // 执行内容同步
+            asyncTask.publishProgess(mContext.getString(R.string.sync_progress_syncing));
+            syncContent();
+        } catch (NetworkFailureException e) {
+            Log.e(TAG, e.toString());
+            return STATE_NETWORK_ERROR;
+        } catch (ActionFailureException e) {
+            Log.e(TAG, e.toString());
+            return STATE_INTERNAL_ERROR;
+        } catch (Exception e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            return STATE_INTERNAL_ERROR;
+        } finally {
+            mGTaskListHashMap.clear();
+            mGTaskHashMap.clear();
+            mMetaHashMap.clear();
+            mLocalDeleteIdMap.clear();
+            mGidToNid.clear();
+            mNidToGid.clear();
+            mSyncing = false;
+        }
+
+        return mCancelled ? STATE_SYNC_CANCELLED : STATE_SUCCESS;
+    }
+
+    /**
+     * 初始化 Google 的任务列表。
+     * @throws NetworkFailureException 网络错误
+     */
+    private void initGTaskList() throws NetworkFailureException {
+        if (mCancelled)
+            return;
+        GTaskClient client = GTaskClient.getInstance();
+        try {
+            JSONArray jsTaskLists = client.getTaskLists();
+
+            // 初始化元数据列表
+            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
+                    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
+            if (mMetaList == null) {
+                mMetaList = new TaskList();
+                mMetaList.setName(GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_META);
+                GTaskClient.getInstance().createTaskList(mMetaList);
+            }
+
+            // 初始化任务列表
+            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
+                    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: 处理 JSONObject 失败");
+        }
+    }
+
+    /**
+     * 同步内容。
+     * @throws NetworkFailureException 网络错误
+     */
+    private void syncContent() throws NetworkFailureException {
+        int syncType;
+        Cursor c = null;
+        String gid;
+        Node node;
+
+        mLocalDeleteIdMap.clear();
+
+        if (mCancelled) {
+            return;
+        }
+
+        // 同步本地已删除的笔记
+        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, "无法查询垃圾文件夹");
+            }
+        } finally {
+            if (c != null) {
+                c.close();
+                c = null;
+            }
+        }
+
+        // 先同步文件夹
+        syncFolder();
+
+        // 同步数据库中已存在的笔记
+        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) {
+                            // 本地添加
+                            syncType = Node.SYNC_ACTION_ADD_REMOTE;
+                        } else {
+                            // 远程删除
+                            syncType = Node.SYNC_ACTION_DEL_LOCAL;
+                        }
+                    }
+                    doContentSync(syncType, node, c);
+                }
+            } else {
+                Log.w(TAG, "无法查询数据库中的现有笔记");
+            }
+
+        } finally {
+            if (c != null) {
+                c.close();
+                c = null;
+            }
+        }
+
+        // 处理剩余的项目（远程添加的任务或文件夹）
+        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);
+        }
+
+        // 清除本地删除表
+        if (!mCancelled) {
+            if (!DataUtils.batchDeleteNotes(mContentResolver, mLocalDeleteIdMap)) {
+                throw new ActionFailureException("批量删除本地删除的笔记失败");
+            }
+        }
+
+        // 刷新本地同步 ID
+        if (!mCancelled) {
+            GTaskClient.getInstance().commitUpdate();
+            refreshLocalSyncId();
+        }
+    }
+
+    /**
+     * 同步文件夹。
+     * @throws NetworkFailureException 网络错误
+     */
+    private void syncFolder() throws NetworkFailureException {
+        Cursor c = null;
+        String gid;
+        Node node;
+        int syncType;
+
+        if (mCancelled) {
+            return;
+        }
+
+        // 同步根文件夹
+        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, "无法查询根文件夹");
+            }
+        } finally {
+            if (c != null) {
+                c.close();
+                c = null;
+            }
+        }
+
+        // 同步通话记录文件夹
+        try {
+            c = mContentResolver.query(Notes.CONTENT_NOTE_URI, SqlNote.PROJECTION_NOTE, "(_id=?)",
+                    new String[] {
+                        String.valueOf(Notes.ID_CALL_RECORD_FOLDER)
+                    }, null);
+            if (c != null) {
+                if (c.moveToNext()) {
+                    gid = c.getString(SqlNote.GTASK_ID_COLUMN);
+                    node = mGTaskHashMap.get(gid);
+                    if (node != null) {
+                        mGTaskHashMap.remove(gid);
+                        mGidToNid.put(gid, (long) Notes.ID_CALL_RECORD_FOLDER);
+                        mNidToGid.put((long) Notes.ID_CALL_RECORD_FOLDER, gid);
+                        // 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_CALL_NOTE))
+                            doContentSync(Node.SYNC_ACTION_UPDATE_REMOTE, node, c);
+                    } else {
+                        doContentSync(Node.SYNC_ACTION_ADD_REMOTE, node, c);
+                    }
+                }
+            } else {
+                Log.w(TAG, "无法查询通话记录文件夹");
+            }
+        } finally {
+            if (c != null) {
+                c.close();
+                c = null;
+            }
+        }
+
+        // 同步本地已存在的文件夹
+        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
+                            syncType = Node.SYNC_ACTION_ADD_REMOTE;
+                        } else {
+                            // 远程删除
+                            syncType = Node.SYNC_ACTION_DEL_LOCAL;
+                        }
+                    }
+                    doContentSync(syncType, node, c);
+                }
+            } else {
+                Log.w(TAG, "无法查询本地已存在的文件夹");
+            }
+        } finally {
+            if (c != null) {
+                c.close();
+                c = null;
+            }
+        }
+
+        // 同步远程添加的文件夹
+        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();
+    }
+
+    /**
+     * 执行内容同步。
+     * @param syncType 同步类型
+     * @param node 节点对象
+     * @param c 数据库游标
+     * @throws NetworkFailureException 网络错误
+     */
+    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:
+                // 处理冲突时，可以考虑合并两边的修改
+                // 目前简单地使用本地更新
+                updateRemoteNode(node, c);
+                break;
+            case Node.SYNC_ACTION_NONE:
+                break;
+            case Node.SYNC_ACTION_ERROR:
+            default:
+                throw new ActionFailureException("未知的同步操作类型");
+        }
+    }
+
+    /**
+     * 添加本地节点。
+     * @param node 节点对象
+     * @throws NetworkFailureException 网络错误
+     */
+    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)) {
+                            // ID 不可用，需要创建新的 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)) {
+                                // 数据 ID 不可用，需要创建新的 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, "无法在本地找到任务的父 ID");
+                throw new ActionFailureException("无法添加本地节点");
+            }
+            sqlNote.setParentId(parentId.longValue());
+        }
+
+        // 创建本地节点
+        sqlNote.setGtaskId(node.getGid());
+        sqlNote.commit(false);
+
+        // 更新 gid-nid 映射
+        mGidToNid.put(node.getGid(), sqlNote.getId());
+        mNidToGid.put(sqlNote.getId(), node.getGid());
+
+        // 更新元数据
+        updateRemoteMeta(node.getGid(), sqlNote);
+    }
+
+    /**
+     * 更新本地节点。
+     * @param node 节点对象
+     * @param c 数据库游标
+     * @throws NetworkFailureException 网络错误
+     */
+    private void updateLocalNode(Node node, Cursor c) throws NetworkFailureException {
+        if (mCancelled) {
+            return;
+        }
+
+        SqlNote sqlNote;
+        // 在本地更新笔记
+        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, "无法在本地找到任务的父 ID");
+            throw new ActionFailureException("无法更新本地节点");
+        }
+        sqlNote.setParentId(parentId.longValue());
+        sqlNote.commit(true);
+
+        // 更新元数据信息
+        updateRemoteMeta(node.getGid(), sqlNote);
+    }
+
+    /**
+     * 添加远程节点。
+     * @param node 节点对象
+     * @param c 数据库游标
+     * @throws NetworkFailureException 网络错误
+     */
+    private void addRemoteNode(Node node, Cursor c) throws NetworkFailureException {
+        if (mCancelled) {
+            return;
+        }
+
+        SqlNote sqlNote = new SqlNote(mContext, c);
+        Node n;
+
+        // 在远程更新
+        if (sqlNote.isNoteType()) {
+            Task task = new Task();
+            task.setContentByLocalJSON(sqlNote.getContent());
+
+            String parentGid = mNidToGid.get(sqlNote.getParentId());
+            if (parentGid == null) {
+                Log.e(TAG, "无法找到任务的父任务列表");
+                throw new ActionFailureException("无法添加远程任务");
+            }
+            mGTaskListHashMap.get(parentGid).addChildTask(task);
+
+            GTaskClient.getInstance().createTask(task);
+            n = (Node) task;
+
+            // 添加元数据
+            updateRemoteMeta(task.getGid(), sqlNote);
+        } else {
+            TaskList tasklist = null;
+
+            // 如果文件夹已存在，则跳过
+            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;
+                }
+            }
+
+            // 如果没有匹配项，则添加新的文件夹
+            if (tasklist == null) {
+                tasklist = new TaskList();
+                tasklist.setContentByLocalJSON(sqlNote.getContent());
+                GTaskClient.getInstance().createTaskList(tasklist);
+                mGTaskListHashMap.put(tasklist.getGid(), tasklist);
+            }
+            n = (Node) tasklist;
+        }
+
+        // 更新本地笔记
+        sqlNote.setGtaskId(n.getGid());
+        sqlNote.commit(false);
+        sqlNote.resetLocalModified();
+        sqlNote.commit(true);
+
+        // gid-id 映射
+        mGidToNid.put(n.getGid(), sqlNote.getId());
+        mNidToGid.put(sqlNote.getId(), n.getGid());
+    }
+
+    /**
+     * 更新远程节点。
+     * @param node 节点对象
+     * @param c 数据库游标
+     * @throws NetworkFailureException 网络错误
+     */
+    private void updateRemoteNode(Node node, Cursor c) throws NetworkFailureException {
+        if (mCancelled) {
+            return;
+        }
+
+        SqlNote sqlNote = new SqlNote(mContext, c);
+
+        // 在远程更新
+        node.setContentByLocalJSON(sqlNote.getContent());
+        GTaskClient.getInstance().addUpdateNode(node);
+
+        // 更新元数据
+        updateRemoteMeta(node.getGid(), sqlNote);
+
+        // 如果需要，移动任务
+        if (sqlNote.isNoteType()) {
+            Task task = (Task) node;
+            TaskList preParentList = task.getParent();
+
+            String curParentGid = mNidToGid.get(sqlNote.getParentId());
+            if (curParentGid == null) {
+                Log.e(TAG, "无法找到任务的父任务列表");
+                throw new ActionFailureException("无法更新远程任务");
+            }
+            TaskList curParentList = mGTaskListHashMap.get(curParentGid);
+
+            if (preParentList != curParentList) {
+                preParentList.removeChildTask(task);
+                curParentList.addChildTask(task);
+                GTaskClient.getInstance().moveTask(task, preParentList, curParentList);
+            }
+        }
+
+        // 清除本地修改标志
+        sqlNote.resetLocalModified();
+        sqlNote.commit(true);
+    }
+
+    /**
+     * 更新远程元数据。
+     * @param gid Google ID
+     * @param sqlNote SqlNote 对象
+     * @throws NetworkFailureException 网络错误
+     */
+    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。
+     * @throws NetworkFailureException 网络错误
+     */
+    private void refreshLocalSyncId() throws NetworkFailureException {
+        if (mCancelled) {
+            return;
+        }
+
+        // 获取最新的 Google Tasks 列表
+        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, "某些内容缺失");
+                        throw new ActionFailureException(
+                                "同步后某些本地项目没有 gid");
+                    }
+                }
+            } else {
+                Log.w(TAG, "无法查询本地笔记以刷新同步 ID");
+            }
+        } finally {
+            if (c != null) {
+                c.close();
+                c = null;
+            }
+        }
+    }
+
+    /**
+     * 获取同步账户名称。
+     * @return 同步账户名称
+     */
+    public String getSyncAccount() {
+        return GTaskClient.getInstance().getSyncAccount().name;
+    }
+
+    /**
+     * 取消同步。
+     */
+    public void cancelSync() {
+        mCancelled = true;
+    }
+}
diff --git a/src/net/micode/notes/data/Notes.java b/src/net/micode/notes/data/Notes.java
index f240604..2f2907e 100644
--- a/src/net/micode/notes/data/Notes.java
+++ b/src/net/micode/notes/data/Notes.java
@@ -2,278 +2,297 @@
  * 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
+ * 你可以在不违反许可协议的情况下使用此文件。
+ * 你可以在以下地址获取许可证的副本：
  *
  *        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.
+ * 除非适用法律要求或书面同意，软件
+ * 根据许可证分发是按“原样”基础进行的，
+ * 不附带任何明示或暗示的担保或条件。
+ * 请参阅许可证以获取特定语言的权限和
+ * 限制。
  */
 
 package net.micode.notes.data;
 
 import android.net.Uri;
+
+// 定义了一个名为Notes的类，包含了与笔记应用相关的常量和接口
 public class Notes {
+    // 定义了Content Provider的权限字符串
     public static final String AUTHORITY = "micode_notes";
+    // 定义了日志标签字符串
     public static final String TAG = "Notes";
-    public static final int TYPE_NOTE     = 0;
-    public static final int TYPE_FOLDER   = 1;
-    public static final int TYPE_SYSTEM   = 2;
+
+    // 定义了笔记类型的常量
+    public static final int TYPE_NOTE = 0;  // 笔记类型
+    public static final int TYPE_FOLDER = 1;  // 文件夹类型
+    public static final int TYPE_SYSTEM = 2;  // 系统类型
 
     /**
-     * Following IDs are system folders' identifiers
-     * {@link Notes#ID_ROOT_FOLDER } is default folder
-     * {@link Notes#ID_TEMPARAY_FOLDER } is for notes belonging no folder
-     * {@link Notes#ID_CALL_RECORD_FOLDER} is to store call records
+     * 以下ID是系统文件夹的标识符
+     * {@link Notes#ID_ROOT_FOLDER } 是默认文件夹
+     * {@link Notes#ID_TEMPARAY_FOLDER } 用于不属于任何文件夹的笔记
+     * {@link Notes#ID_CALL_RECORD_FOLDER} 用于存储通话记录
+     * {@link Notes#ID_TRASH_FOLER} 用于存储已删除的笔记
      */
     public static final int ID_ROOT_FOLDER = 0;
     public static final int ID_TEMPARAY_FOLDER = -1;
     public static final int ID_CALL_RECORD_FOLDER = -2;
     public static final int ID_TRASH_FOLER = -3;
 
-    public static final String INTENT_EXTRA_ALERT_DATE = "net.micode.notes.alert_date";
-    public static final String INTENT_EXTRA_BACKGROUND_ID = "net.micode.notes.background_color_id";
-    public static final String INTENT_EXTRA_WIDGET_ID = "net.micode.notes.widget_id";
-    public static final String INTENT_EXTRA_WIDGET_TYPE = "net.micode.notes.widget_type";
-    public static final String INTENT_EXTRA_FOLDER_ID = "net.micode.notes.folder_id";
-    public static final String INTENT_EXTRA_CALL_DATE = "net.micode.notes.call_date";
+    // 定义了一些Intent的extra键名
+    public static final String INTENT_EXTRA_ALERT_DATE = "net.micode.notes.alert_date";  // 提醒日期
+    public static final String INTENT_EXTRA_BACKGROUND_ID = "net.micode.notes.background_color_id";  // 背景颜色ID
+    public static final String INTENT_EXTRA_WIDGET_ID = "net.micode.notes.widget_id";  // 小部件ID
+    public static final String INTENT_EXTRA_WIDGET_TYPE = "net.micode.notes.widget_type";  // 小部件类型
+    public static final String INTENT_EXTRA_FOLDER_ID = "net.micode.notes.folder_id";  // 文件夹ID
+    public static final String INTENT_EXTRA_CALL_DATE = "net.micode.notes.call_date";  // 通话日期
 
-    public static final int TYPE_WIDGET_INVALIDE      = -1;
-    public static final int TYPE_WIDGET_2X            = 0;
-    public static final int TYPE_WIDGET_4X            = 1;
+    // 定义了小部件类型的常量
+    public static final int TYPE_WIDGET_INVALIDE = -1;  // 无效的小部件
+    public static final int TYPE_WIDGET_2X = 0;  // 2x尺寸的小部件
+    public static final int TYPE_WIDGET_4X = 1;  // 4x尺寸的小部件
 
+    // 定义一个内部类DataConstants，包含一些与数据类型相关的常量
     public static class DataConstants {
+        // 定义了文本笔记的数据类型
         public static final String NOTE = TextNote.CONTENT_ITEM_TYPE;
+        // 定义了通话笔记的数据类型
         public static final String CALL_NOTE = CallNote.CONTENT_ITEM_TYPE;
     }
 
     /**
-     * Uri to query all notes and folders
+     * Uri用于查询所有的笔记和文件夹
+     * 解析为：content://micode_notes/note
      */
     public static final Uri CONTENT_NOTE_URI = Uri.parse("content://" + AUTHORITY + "/note");
 
     /**
-     * Uri to query data
+     * Uri用于查询数据
+     * 解析为：content://micode_notes/data
      */
     public static final Uri CONTENT_DATA_URI = Uri.parse("content://" + AUTHORITY + "/data");
 
+    // 定义了一个接口NoteColumns，包含了一些与笔记和文件夹相关的列名
     public interface NoteColumns {
         /**
-         * The unique ID for a row
-         * <P> Type: INTEGER (long) </P>
+         * 笔记或文件夹的唯一ID
+         * <P> 类型：INTEGER (long) </P>
          */
         public static final String ID = "_id";
 
         /**
-         * The parent's id for note or folder
-         * <P> Type: INTEGER (long) </P>
+         * 笔记或文件夹的父ID
+         * <P> 类型：INTEGER (long) </P>
          */
         public static final String PARENT_ID = "parent_id";
 
         /**
-         * Created data for note or folder
-         * <P> Type: INTEGER (long) </P>
+         * 笔记或文件夹的创建日期
+         * <P> 类型：INTEGER (long) </P>
          */
         public static final String CREATED_DATE = "created_date";
 
         /**
-         * Latest modified date
-         * <P> Type: INTEGER (long) </P>
+         * 笔记或文件夹的最新修改日期
+         * <P> 类型：INTEGER (long) </P>
          */
         public static final String MODIFIED_DATE = "modified_date";
 
-
         /**
-         * Alert date
-         * <P> Type: INTEGER (long) </P>
+         * 笔记的提醒日期
+         * <P> 类型：INTEGER (long) </P>
          */
         public static final String ALERTED_DATE = "alert_date";
 
         /**
-         * Folder's name or text content of note
-         * <P> Type: TEXT </P>
+         * 文件夹的名称或笔记的文本内容
+         * <P> 类型：TEXT </P>
          */
         public static final String SNIPPET = "snippet";
 
         /**
-         * Note's widget id
-         * <P> Type: INTEGER (long) </P>
+         * 笔记的小部件ID
+         * <P> 类型：INTEGER (long) </P>
          */
         public static final String WIDGET_ID = "widget_id";
 
         /**
-         * Note's widget type
-         * <P> Type: INTEGER (long) </P>
+         * 笔记的小部件类型
+         * <P> 类型：INTEGER (long) </P>
          */
         public static final String WIDGET_TYPE = "widget_type";
 
         /**
-         * Note's background color's id
-         * <P> Type: INTEGER (long) </P>
+         * 笔记的背景颜色ID
+         * <P> 类型：INTEGER (long) </P>
          */
         public static final String BG_COLOR_ID = "bg_color_id";
 
         /**
-         * For text note, it doesn't has attachment, for multi-media
-         * note, it has at least one attachment
-         * <P> Type: INTEGER </P>
+         * 对于文本笔记，它没有附件；对于多媒体笔记，至少有一个附件
+         * <P> 类型：INTEGER </P>
          */
         public static final String HAS_ATTACHMENT = "has_attachment";
 
         /**
-         * Folder's count of notes
-         * <P> Type: INTEGER (long) </P>
+         * 文件夹中的笔记数量
+         * <P> 类型：INTEGER (long) </P>
          */
         public static final String NOTES_COUNT = "notes_count";
 
         /**
-         * The file type: folder or note
-         * <P> Type: INTEGER </P>
+         * 笔记或文件夹的类型
+         * <P> 类型：INTEGER </P>
          */
         public static final String TYPE = "type";
 
         /**
-         * The last sync id
-         * <P> Type: INTEGER (long) </P>
+         * 最后同步ID
+         * <P> 类型：INTEGER (long) </P>
          */
         public static final String SYNC_ID = "sync_id";
 
         /**
-         * Sign to indicate local modified or not
-         * <P> Type: INTEGER </P>
+         * 标志以指示是否本地修改过
+         * <P> 类型：INTEGER </P>
          */
         public static final String LOCAL_MODIFIED = "local_modified";
 
         /**
-         * Original parent id before moving into temporary folder
-         * <P> Type : INTEGER </P>
+         * 移动到临时文件夹之前的原始父ID
+         * <P> 类型：INTEGER </P>
          */
         public static final String ORIGIN_PARENT_ID = "origin_parent_id";
 
         /**
-         * The gtask id
-         * <P> Type : TEXT </P>
+         * Google任务ID
+         * <P> 类型：TEXT </P>
          */
         public static final String GTASK_ID = "gtask_id";
 
         /**
-         * The version code
-         * <P> Type : INTEGER (long) </P>
+         * 版本号
+         * <P> 类型：INTEGER (long) </P>
          */
         public static final String VERSION = "version";
     }
 
+    // 定义了一个接口DataColumns，包含了一些与数据相关的列名
     public interface DataColumns {
         /**
-         * The unique ID for a row
-         * <P> Type: INTEGER (long) </P>
+         * 数据的唯一ID
+         * <P> 类型：INTEGER (long) </P>
          */
         public static final String ID = "_id";
 
         /**
-         * The MIME type of the item represented by this row.
-         * <P> Type: Text </P>
+         * 此行所代表项目的数据类型（MIME类型）。
+         * <P> 类型：TEXT </P>
          */
         public static final String MIME_TYPE = "mime_type";
 
         /**
-         * The reference id to note that this data belongs to
-         * <P> Type: INTEGER (long) </P>
+         * 引用此数据属于的笔记ID
+         * <P> 类型：INTEGER (long) </P>
          */
         public static final String NOTE_ID = "note_id";
 
         /**
-         * Created data for note or folder
-         * <P> Type: INTEGER (long) </P>
+         * 数据的创建日期
+         * <P> 类型：INTEGER (long) </P>
          */
         public static final String CREATED_DATE = "created_date";
 
         /**
-         * Latest modified date
-         * <P> Type: INTEGER (long) </P>
+         * 数据的最新修改日期
+         * <P> 类型：INTEGER (long) </P>
          */
         public static final String MODIFIED_DATE = "modified_date";
 
         /**
-         * Data's content
-         * <P> Type: TEXT </P>
+         * 数据的内容
+         * <P> 类型：TEXT </P>
          */
         public static final String CONTENT = "content";
 
-
         /**
-         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
-         * integer data type
-         * <P> Type: INTEGER </P>
+         * 通用数据列，含义取决于 {@link #MIME_TYPE}，用于整型数据类型
+         * <P> 类型：INTEGER </P>
          */
         public static final String DATA1 = "data1";
 
         /**
-         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
-         * integer data type
-         * <P> Type: INTEGER </P>
+         * 通用数据列，含义取决于 {@link #MIME_TYPE}，用于整型数据类型
+         * <P> 类型：INTEGER </P>
          */
         public static final String DATA2 = "data2";
 
         /**
-         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
-         * TEXT data type
-         * <P> Type: TEXT </P>
+         * 通用数据列，含义取决于 {@link #MIME_TYPE}，用于文本数据类型
+         * <P> 类型：TEXT </P>
          */
         public static final String DATA3 = "data3";
 
         /**
-         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
-         * TEXT data type
-         * <P> Type: TEXT </P>
+         * 通用数据列，含义取决于 {@link #MIME_TYPE}，用于文本数据类型
+         * <P> 类型：TEXT </P>
          */
         public static final String DATA4 = "data4";
 
         /**
-         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
-         * TEXT data type
-         * <P> Type: TEXT </P>
+         * 通用数据列，含义取决于 {@link #MIME_TYPE}，用于文本数据类型
+         * <P> 类型：TEXT </P>
          */
         public static final String DATA5 = "data5";
     }
 
+    // 定义了一个内部类TextNote，继承自DataColumns，表示文本笔记的数据结构
     public static final class TextNote implements DataColumns {
         /**
-         * Mode to indicate the text in check list mode or not
-         * <P> Type: Integer 1:check list mode 0: normal mode </P>
+         * 模式以指示文本是否处于检查列表模式
+         * <P> 类型：Integer 1:检查列表模式 0:正常模式 </P>
          */
         public static final String MODE = DATA1;
 
+        // 定义了文本笔记模式的常量
         public static final int MODE_CHECK_LIST = 1;
 
+        // 定义了文本笔记的MIME类型
         public static final String CONTENT_TYPE = "vnd.android.cursor.dir/text_note";
-
         public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/text_note";
 
+        /**
+         * 文本笔记的Uri
+         * 解析为：content://micode_notes/text_note
+         */
         public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/text_note");
     }
 
+    // 定义了一个内部类CallNote，继承自DataColumns，表示通话笔记的数据结构
     public static final class CallNote implements DataColumns {
         /**
-         * Call date for this record
-         * <P> Type: INTEGER (long) </P>
+         * 此记录的通话日期
+         * <P> 类型：INTEGER (long) </P>
          */
         public static final String CALL_DATE = DATA1;
 
         /**
-         * Phone number for this record
-         * <P> Type: TEXT </P>
+         * 此记录的电话号码
+         * <P> 类型：TEXT </P>
          */
         public static final String PHONE_NUMBER = DATA3;
 
+        // 定义了通话笔记的MIME类型
         public static final String CONTENT_TYPE = "vnd.android.cursor.dir/call_note";
-
         public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/call_note";
 
+        /**
+         * 通话笔记的Uri
+         * 解析为：content://micode_notes/call_note
+         */
         public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/call_note");
     }
 }
diff --git a/src/net/micode/notes/data/NotesDatabaseHelper.java b/src/net/micode/notes/data/NotesDatabaseHelper.java
index ffe5d57..f60de93 100644
--- a/src/net/micode/notes/data/NotesDatabaseHelper.java
+++ b/src/net/micode/notes/data/NotesDatabaseHelper.java
@@ -2,16 +2,16 @@
  * 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
+ * 你可以在不违反许可协议的情况下使用此文件。
+ * 你可以在以下地址获取许可证的副本：
  *
  *        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.
+ * 除非适用法律要求或书面同意，软件
+ * 根据许可证分发是按“原样”基础进行的，
+ * 不附带任何明示或暗示的担保或条件。
+ * 请参阅许可证以获取特定语言的权限和
+ * 限制。
  */
 
 package net.micode.notes.data;
@@ -26,198 +26,209 @@ import net.micode.notes.data.Notes.DataColumns;
 import net.micode.notes.data.Notes.DataConstants;
 import net.micode.notes.data.Notes.NoteColumns;
 
-
+// NotesDatabaseHelper 是一个 SQLiteOpenHelper 类的子类，用于管理笔记应用的数据库
 public class NotesDatabaseHelper extends SQLiteOpenHelper {
+    // 定义了数据库名称
     private static final String DB_NAME = "note.db";
 
+    // 定义了数据库版本号
     private static final int DB_VERSION = 4;
 
+    // 定义了一个内部接口TABLE，包含了表名常量
     public interface TABLE {
-        public static final String NOTE = "note";
-
-        public static final String DATA = "data";
+        public static final String NOTE = "note";  // 笔记表名
+        public static final String DATA = "data";  // 数据表名
     }
 
+    // 定义了日志标签字符串
     private static final String TAG = "NotesDatabaseHelper";
 
+    // 定义了单例实例
     private static NotesDatabaseHelper mInstance;
 
+    // 定义了创建笔记表的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" +
+            NoteColumns.ID + " INTEGER PRIMARY KEY," + // 笔记ID，主键
+            NoteColumns.PARENT_ID + " INTEGER NOT NULL DEFAULT 0," + // 父文件夹ID，默认为0
+            NoteColumns.ALERTED_DATE + " INTEGER NOT NULL DEFAULT 0," + // 提醒日期，默认为0
+            NoteColumns.BG_COLOR_ID + " INTEGER NOT NULL DEFAULT 0," + // 背景颜色ID，默认为0
+            NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + // 创建日期，默认为当前时间（毫秒）
+            NoteColumns.HAS_ATTACHMENT + " INTEGER NOT NULL DEFAULT 0," + // 是否有附件，默认为0
+            NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + // 修改日期，默认为当前时间（毫秒）
+            NoteColumns.NOTES_COUNT + " INTEGER NOT NULL DEFAULT 0," + // 笔记数量，默认为0
+            NoteColumns.SNIPPET + " TEXT NOT NULL DEFAULT ''," + // 笔记摘要，默认为空字符串
+            NoteColumns.TYPE + " INTEGER NOT NULL DEFAULT 0," + // 笔记类型，默认为0
+            NoteColumns.WIDGET_ID + " INTEGER NOT NULL DEFAULT 0," + // 小部件ID，默认为0
+            NoteColumns.WIDGET_TYPE + " INTEGER NOT NULL DEFAULT -1," + // 小部件类型，默认为-1
+            NoteColumns.SYNC_ID + " INTEGER NOT NULL DEFAULT 0," + // 同步ID，默认为0
+            NoteColumns.LOCAL_MODIFIED + " INTEGER NOT NULL DEFAULT 0," + // 是否本地修改，默认为0
+            NoteColumns.ORIGIN_PARENT_ID + " INTEGER NOT NULL DEFAULT 0," + // 原始父文件夹ID，默认为0
+            NoteColumns.GTASK_ID + " TEXT NOT NULL DEFAULT ''," + // GTasks ID，默认为空字符串
+            NoteColumns.VERSION + " INTEGER NOT NULL DEFAULT 0" + // 版本号，默认为0
         ")";
 
+    // 定义了创建 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 ''" +
+            DataColumns.ID + " INTEGER PRIMARY KEY," + // 数据ID，主键
+            DataColumns.MIME_TYPE + " TEXT NOT NULL," + // MIME类型，默认为空字符串
+            DataColumns.NOTE_ID + " INTEGER NOT NULL DEFAULT 0," + // 关联的笔记ID，默认为0
+            NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + // 创建日期，默认为当前时间（毫秒）
+            NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + // 修改日期，默认为当前时间（毫秒）
+            DataColumns.CONTENT + " TEXT NOT NULL DEFAULT ''," + // 数据内容，默认为空字符串
+            DataColumns.DATA1 + " INTEGER," + // 自定义数据1
+            DataColumns.DATA2 + " INTEGER," + // 自定义数据2
+            DataColumns.DATA3 + " TEXT NOT NULL DEFAULT ''," + // 自定义数据3，默认为空字符串
+            DataColumns.DATA4 + " TEXT NOT NULL DEFAULT ''," + // 自定义数据4，默认为空字符串
+            DataColumns.DATA5 + " TEXT NOT NULL DEFAULT ''" + // 自定义数据5，默认为空字符串
         ")";
 
+    // 定义了创建数据表中note_id索引的SQL语句
     private static final String CREATE_DATA_NOTE_ID_INDEX_SQL =
         "CREATE INDEX IF NOT EXISTS note_id_index ON " +
-        TABLE.DATA + "(" + DataColumns.NOTE_ID + ");";
+        TABLE.DATA + "(" + DataColumns.NOTE_ID + "); "; // 为data表中的note_id列创建索引
 
     /**
-     * Increase folder's note count when move note to the folder
+     * 当笔记移动到文件夹时，增加文件夹的笔记数量
      */
     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 + ";" +
+        "   SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" + // 更新父文件夹的笔记数量加1
+        "  WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" + // 父文件夹ID为移动后的文件夹ID
         " END";
 
     /**
-     * Decrease folder's note count when move note from folder
+     * 当笔记从文件夹中移除时，减少文件夹的笔记数量
      */
     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" + ";" +
+        "   SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" + // 更新父文件夹的笔记数量减1
+        "  WHERE " + NoteColumns.ID + "=old." + NoteColumns.PARENT_ID + // 父文件夹ID为移动前的文件夹ID
+        "  AND " + NoteColumns.NOTES_COUNT + ">0" + ";" + // 仅当笔记数量大于0时更新
         " END";
 
     /**
-     * Increase folder's note count when insert new note to the folder
+     * 当向文件夹中插入新笔记时，增加文件夹的笔记数量
      */
     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 + ";" +
+        "   SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" + // 更新父文件夹的笔记数量加1
+        "  WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" + // 父文件夹ID为新笔记的父文件夹ID
         " END";
 
     /**
-     * Decrease folder's note count when delete note from the folder
+     * 当从文件夹中删除笔记时，减少文件夹的笔记数量
      */
     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;" +
+        "   SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" + // 更新父文件夹的笔记数量减1
+        "  WHERE " + NoteColumns.ID + "=old." + NoteColumns.PARENT_ID + // 父文件夹ID为删除笔记的父文件夹ID
+        "  AND " + NoteColumns.NOTES_COUNT + ">0;" + // 仅当笔记数量大于0时更新
         " END";
 
     /**
-     * Update note's content when insert data with type {@link DataConstants#NOTE}
+     * 当插入类型为 {@link DataConstants#NOTE} 的数据时，更新笔记的内容
      */
     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 + "'" +
+        " WHEN new." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" + // 当插入的数据类型为笔记时
         " BEGIN" +
         "  UPDATE " + TABLE.NOTE +
-        "   SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT +
-        "  WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" +
+        "   SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT + // 更新笔记的摘要为新插入的数据内容
+        "  WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" + // 笔记ID为新插入数据关联的笔记ID
         " END";
 
     /**
-     * Update note's content when data with {@link DataConstants#NOTE} type has changed
+     * 当更新类型为 {@link DataConstants#NOTE} 的数据时，更新笔记的内容
      */
     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 + "'" +
+        " WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" + // 当更新的数据类型为笔记时
         " BEGIN" +
         "  UPDATE " + TABLE.NOTE +
-        "   SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT +
-        "  WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" +
+        "   SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT + // 更新笔记的摘要为更新后的数据内容
+        "  WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" + // 笔记ID为更新数据关联的笔记ID
         " END";
 
     /**
-     * Update note's content when data with {@link DataConstants#NOTE} type has deleted
+     * 当删除类型为 {@link DataConstants#NOTE} 的数据时，清空笔记的内容
      */
     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 + "'" +
+        " WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" + // 当删除的数据类型为笔记时
         " BEGIN" +
         "  UPDATE " + TABLE.NOTE +
-        "   SET " + NoteColumns.SNIPPET + "=''" +
-        "  WHERE " + NoteColumns.ID + "=old." + DataColumns.NOTE_ID + ";" +
+        "   SET " + NoteColumns.SNIPPET + "=''" + // 清空笔记的摘要
+        "  WHERE " + NoteColumns.ID + "=old." + DataColumns.NOTE_ID + ";" + // 笔记ID为删除数据关联的笔记ID
         " END";
 
     /**
-     * Delete datas belong to note which has been deleted
+     * 当删除笔记时，删除属于该笔记的所有数据
      */
     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 + ";" +
+        "  DELETE FROM " + TABLE.DATA + // 删除data表中与笔记ID关联的所有数据
+        "   WHERE " + DataColumns.NOTE_ID + "=old." + NoteColumns.ID + ";" + // 笔记ID为删除笔记的ID
         " END";
 
     /**
-     * Delete notes belong to folder which has been deleted
+     * 当删除文件夹时，删除属于该文件夹的所有笔记
      */
     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 + ";" +
+        "  DELETE FROM " + TABLE.NOTE + // 删除note表中与文件夹ID关联的所有笔记
+        "   WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" + // 父文件夹ID为删除文件夹的ID
         " END";
 
     /**
-     * Move notes belong to folder which has been moved to trash folder
+     * 当文件夹被移动到回收站文件夹时，将文件夹中的所有笔记也移动到回收站文件夹
      */
     private static final String FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER =
         "CREATE TRIGGER folder_move_notes_on_trash " +
         " AFTER UPDATE ON " + TABLE.NOTE +
-        " WHEN new." + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER +
+        " WHEN new." + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER + // 当笔记被移动到回收站文件夹时
         " BEGIN" +
         "  UPDATE " + TABLE.NOTE +
-        "   SET " + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER +
-        "  WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" +
+        "   SET " + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER + // 将笔记的父文件夹ID设置为回收站文件夹ID
+        "  WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" + // 笔记的父文件夹ID为移动前的文件夹ID
         " END";
 
+    // 构造函数，初始化数据库帮助器
     public NotesDatabaseHelper(Context context) {
         super(context, DB_NAME, null, DB_VERSION);
     }
 
+    // 创建笔记表的方法
     public void createNoteTable(SQLiteDatabase db) {
-        db.execSQL(CREATE_NOTE_TABLE_SQL);
-        reCreateNoteTableTriggers(db);
-        createSystemFolder(db);
-        Log.d(TAG, "note table has been created");
+        db.execSQL(CREATE_NOTE_TABLE_SQL); // 执行创建笔记表的SQL语句
+        reCreateNoteTableTriggers(db); // 重新创建笔记表的触发器
+        createSystemFolder(db); // 创建系统文件夹
+        Log.d(TAG, "note table has been created"); // 记录日志，表示笔记表已创建
     }
 
+    // 重新创建笔记表触发器的方法
     private void reCreateNoteTableTriggers(SQLiteDatabase db) {
+        // 删除旧的触发器
         db.execSQL("DROP TRIGGER IF EXISTS increase_folder_count_on_update");
         db.execSQL("DROP TRIGGER IF EXISTS decrease_folder_count_on_update");
         db.execSQL("DROP TRIGGER IF EXISTS decrease_folder_count_on_delete");
@@ -226,6 +237,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
         db.execSQL("DROP TRIGGER IF EXISTS folder_delete_notes_on_delete");
         db.execSQL("DROP TRIGGER IF EXISTS folder_move_notes_on_trash");
 
+        // 创建新的触发器
         db.execSQL(NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER);
         db.execSQL(NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER);
         db.execSQL(NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER);
@@ -235,128 +247,147 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
         db.execSQL(FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER);
     }
 
+    // 创建系统文件夹的方法
     private void createSystemFolder(SQLiteDatabase db) {
         ContentValues values = new ContentValues();
 
         /**
-         * call record foler for call notes
+         * 创建通话记录文件夹，用于存储通话笔记
          */
-        values.put(NoteColumns.ID, Notes.ID_CALL_RECORD_FOLDER);
-        values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
-        db.insert(TABLE.NOTE, null, values);
+        values.put(NoteColumns.ID, Notes.ID_CALL_RECORD_FOLDER); // 设置系统文件夹ID
+        values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM); // 设置文件夹类型为系统类型
+        db.insert(TABLE.NOTE, null, values); // 插入通话记录文件夹到笔记表
 
         /**
-         * root folder which is default folder
+         * 创建根文件夹，默认文件夹
          */
-        values.clear();
-        values.put(NoteColumns.ID, Notes.ID_ROOT_FOLDER);
-        values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
-        db.insert(TABLE.NOTE, null, values);
+        values.clear(); // 清空之前插入的值
+        values.put(NoteColumns.ID, Notes.ID_ROOT_FOLDER); // 设置系统文件夹ID
+        values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM); // 设置文件夹类型为系统类型
+        db.insert(TABLE.NOTE, null, values); // 插入根文件夹到笔记表
 
         /**
-         * temporary folder which is used for moving note
+         * 创建临时文件夹，用于移动笔记
          */
-        values.clear();
-        values.put(NoteColumns.ID, Notes.ID_TEMPARAY_FOLDER);
-        values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
-        db.insert(TABLE.NOTE, null, values);
+        values.clear(); // 清空之前插入的值
+        values.put(NoteColumns.ID, Notes.ID_TEMPARAY_FOLDER); // 设置系统文件夹ID
+        values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM); // 设置文件夹类型为系统类型
+        db.insert(TABLE.NOTE, null, values); // 插入临时文件夹到笔记表
 
         /**
-         * create trash folder
+         * 创建回收站文件夹
          */
-        values.clear();
-        values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);
-        values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
-        db.insert(TABLE.NOTE, null, values);
+        values.clear(); // 清空之前插入的值
+        values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER); // 设置系统文件夹ID
+        values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM); // 设置文件夹类型为系统类型
+        db.insert(TABLE.NOTE, null, values); // 插入回收站文件夹到笔记表
     }
 
+    // 创建数据表的方法
     public void createDataTable(SQLiteDatabase db) {
-        db.execSQL(CREATE_DATA_TABLE_SQL);
-        reCreateDataTableTriggers(db);
-        db.execSQL(CREATE_DATA_NOTE_ID_INDEX_SQL);
-        Log.d(TAG, "data table has been created");
+        db.execSQL(CREATE_DATA_TABLE_SQL); // 执行创建数据表的SQL语句
+        reCreateDataTableTriggers(db); // 重新创建数据表的触发器
+        db.execSQL(CREATE_DATA_NOTE_ID_INDEX_SQL); // 创建note_id索引
+        Log.d(TAG, "data table has been created"); // 记录日志，表示数据表已创建
     }
 
+    // 重新创建数据表触发器的方法
     private void reCreateDataTableTriggers(SQLiteDatabase db) {
+        // 删除旧的触发器
         db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_insert");
         db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_update");
         db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_delete");
 
+        // 创建新的触发器
         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);
     }
 
+    // 获取 NotesDatabaseHelper 单例实例的方法
     static synchronized NotesDatabaseHelper getInstance(Context context) {
         if (mInstance == null) {
-            mInstance = new NotesDatabaseHelper(context);
+            mInstance = new NotesDatabaseHelper(context); // 初始化单例实例
         }
-        return mInstance;
+        return mInstance; // 返回单例实例
     }
 
+    // 当数据库第一次创建时调用的方法
     @Override
     public void onCreate(SQLiteDatabase db) {
-        createNoteTable(db);
-        createDataTable(db);
+        createNoteTable(db); // 创建笔记表
+        createDataTable(db); // 创建数据表
     }
 
+    // 当数据库需要升级时调用的方法
     @Override
     public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
         boolean reCreateTriggers = false;
         boolean skipV2 = false;
 
+        // 如果当前版本是1，直接删除旧表并创建新表
         if (oldVersion == 1) {
-            upgradeToV2(db);
-            skipV2 = true; // this upgrade including the upgrade from v2 to v3
+            upgradeToV2(db); // 升级到版本2
+            skipV2 = true; // 这次升级包含了从v2到v3的升级
             oldVersion++;
         }
 
+        // 如果当前版本是2，添加新的列并创建系统文件夹
         if (oldVersion == 2 && !skipV2) {
-            upgradeToV3(db);
-            reCreateTriggers = true;
+            upgradeToV3(db); // 升级到版本3
+            reCreateTriggers = true; // 标记需要重新创建触发器
             oldVersion++;
         }
 
+        // 如果当前版本是3，添加版本号列
         if (oldVersion == 3) {
-            upgradeToV4(db);
+            upgradeToV4(db); // 升级到版本4
             oldVersion++;
         }
 
+        // 如果需要重新创建触发器，调用相应的方法
         if (reCreateTriggers) {
-            reCreateNoteTableTriggers(db);
-            reCreateDataTableTriggers(db);
+            reCreateNoteTableTriggers(db); // 重新创建笔记表的触发器
+            reCreateDataTableTriggers(db); // 重新创建数据表的触发器
         }
 
+        // 如果升级失败，抛出异常
         if (oldVersion != newVersion) {
             throw new IllegalStateException("Upgrade notes database to version " + newVersion
-                    + "fails");
+                    + " fails"); // 抛出异常，表示数据库升级失败
         }
     }
 
+    // 升级到数据库版本2的方法
     private void upgradeToV2(SQLiteDatabase db) {
-        db.execSQL("DROP TABLE IF EXISTS " + TABLE.NOTE);
-        db.execSQL("DROP TABLE IF EXISTS " + TABLE.DATA);
-        createNoteTable(db);
-        createDataTable(db);
+        db.execSQL("DROP TABLE IF EXISTS " + TABLE.NOTE); // 删除旧的笔记表
+        db.execSQL("DROP TABLE IF EXISTS " + TABLE.DATA); // 删除旧的数据表
+        createNoteTable(db); // 创建新的笔记表
+        createDataTable(db); // 创建新的数据表
     }
 
+    // 升级到数据库版本3的方法
     private void upgradeToV3(SQLiteDatabase db) {
-        // drop unused triggers
+        // 删除不再使用的触发器
         db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_insert");
         db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_delete");
         db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_update");
-        // add a column for gtask id
+
+        // 添加 gtask id 列
         db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.GTASK_ID
-                + " TEXT NOT NULL DEFAULT ''");
-        // add a trash system folder
+                + " TEXT NOT NULL DEFAULT ''"); // 为笔记表添加gtask_id列
+
+        // 添加回收站系统文件夹
         ContentValues values = new ContentValues();
-        values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);
-        values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
-        db.insert(TABLE.NOTE, null, values);
+        values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER); // 设置系统文件夹ID
+        values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM); // 设置文件夹类型为系统类型
+        db.insert(TABLE.NOTE, null, values); // 插入回收站文件夹到笔记表
     }
 
+    // 升级到数据库版本4的方法
     private void upgradeToV4(SQLiteDatabase db) {
+        // 添加版本号列
         db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.VERSION
-                + " INTEGER NOT NULL DEFAULT 0");
+                + " INTEGER NOT NULL DEFAULT 0"); // 为笔记表添加version列
     }
 }
diff --git a/src/net/micode/notes/data/NotesProvider.java b/src/net/micode/notes/data/NotesProvider.java
index edb0a60..7d2ffc2 100644
--- a/src/net/micode/notes/data/NotesProvider.java
+++ b/src/net/micode/notes/data/NotesProvider.java
@@ -16,7 +16,6 @@
 
 package net.micode.notes.data;
 
-
 import android.app.SearchManager;
 import android.content.ContentProvider;
 import android.content.ContentUris;
@@ -34,22 +33,26 @@ import net.micode.notes.data.Notes.DataColumns;
 import net.micode.notes.data.Notes.NoteColumns;
 import net.micode.notes.data.NotesDatabaseHelper.TABLE;
 
-
 public class NotesProvider extends ContentProvider {
+    // UriMatcher用于匹配不同的URI请求，帮助识别是请求笔记还是笔记数据，或是搜索请求等，并返回相应的请求类型代码
     private static final UriMatcher mMatcher;
 
+    // 数据库辅助类，用于创建和管理数据库
     private NotesDatabaseHelper mHelper;
 
+    // 日志标签，便于调试和日志记录
     private static final String TAG = "NotesProvider";
 
-    private static final int URI_NOTE            = 1;
-    private static final int URI_NOTE_ITEM       = 2;
-    private static final int URI_DATA            = 3;
-    private static final int URI_DATA_ITEM       = 4;
+    // 定义URI请求类型常量
+    private static final int URI_NOTE            = 1; // 匹配所有笔记的URI
+    private static final int URI_NOTE_ITEM       = 2; // 匹配特定笔记ID的URI
+    private static final int URI_DATA            = 3; // 匹配所有笔记数据的URI
+    private static final int URI_DATA_ITEM       = 4; // 匹配特定笔记数据ID的URI
 
-    private static final int URI_SEARCH          = 5;
-    private static final int URI_SEARCH_SUGGEST  = 6;
+    private static final int URI_SEARCH          = 5; // 匹配搜索请求的URI
+    private static final int URI_SEARCH_SUGGEST  = 6; // 匹配搜索建议请求的URI
 
+    // 静态代码块，在类加载时初始化UriMatcher，添加各种URI模式及其对应的代码
     static {
         mMatcher = new UriMatcher(UriMatcher.NO_MATCH);
         mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE);
@@ -62,8 +65,9 @@ public class NotesProvider extends ContentProvider {
     }
 
     /**
-     * x'0A' represents the '\n' character in sqlite. For title and content in the search result,
-     * we will trim '\n' and white space in order to show more information.
+     * x'0A'表示在sqlite中的'\n'字符。对于搜索结果中的标题和内容，
+     * 我们将修剪'\n'和空白字符，以便显示更多信息。
+     * 此投影用于搜索结果，将笔记ID和片段内容格式化以便显示。
      */
     private static final String NOTES_SEARCH_PROJECTION = NoteColumns.ID + ","
         + NoteColumns.ID + " AS " + SearchManager.SUGGEST_COLUMN_INTENT_EXTRA_DATA + ","
@@ -73,233 +77,266 @@ public class NotesProvider extends ContentProvider {
         + "'" + Intent.ACTION_VIEW + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_ACTION + ","
         + "'" + Notes.TextNote.CONTENT_TYPE + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_DATA;
 
+    // SQL查询语句，用于根据搜索字符串查询笔记片段。查询结果将用于搜索功能和搜索建议。
     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时调用，初始化NotesDatabaseHelper以准备数据库操作
     @Override
     public boolean onCreate() {
-        mHelper = NotesDatabaseHelper.getInstance(getContext());
+        mHelper = NotesDatabaseHelper.getInstance(getContext()); // 获取数据库帮助器的单例实例
         return true;
     }
 
+    // 根据不同的URI请求类型执行查询操作，返回查询结果的游标
     @Override
     public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
             String sortOrder) {
         Cursor c = null;
-        SQLiteDatabase db = mHelper.getReadableDatabase();
+        SQLiteDatabase db = mHelper.getReadableDatabase(); // 获取可读的数据库实例
         String id = null;
         switch (mMatcher.match(uri)) {
             case URI_NOTE:
-                c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null,
-                        sortOrder);
+                // 查询所有笔记，返回符合条件的所有笔记游标
+                c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null, sortOrder);
                 break;
             case URI_NOTE_ITEM:
-                id = uri.getPathSegments().get(1);
+                // 查询特定ID的笔记，返回符合条件的单条笔记游标
+                id = uri.getPathSegments().get(1); // 获取URI路径中的笔记ID
                 c = db.query(TABLE.NOTE, projection, NoteColumns.ID + "=" + id
                         + parseSelection(selection), selectionArgs, null, null, sortOrder);
                 break;
             case URI_DATA:
-                c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null,
-                        sortOrder);
+                // 查询所有笔记数据，返回符合条件的所有笔记数据游标
+                c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null, sortOrder);
                 break;
             case URI_DATA_ITEM:
-                id = uri.getPathSegments().get(1);
+                // 查询特定ID的笔记数据，返回符合条件的单条笔记数据游标
+                id = uri.getPathSegments().get(1); // 获取URI路径中的笔记数据ID
                 c = db.query(TABLE.DATA, projection, DataColumns.ID + "=" + id
                         + parseSelection(selection), selectionArgs, null, null, sortOrder);
                 break;
             case URI_SEARCH:
             case URI_SEARCH_SUGGEST:
+                // 搜索时不允许指定排序条件、选择条件、选择参数或投影，以确保搜索结果的一致性
                 if (sortOrder != null || projection != null) {
                     throw new IllegalArgumentException(
-                            "do not specify sortOrder, selection, selectionArgs, or projection" + "with this query");
+                            "不允许在搜索时指定排序条件、选择条件、选择参数或投影");
                 }
 
                 String searchString = null;
+                // 获取搜索字符串
                 if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) {
                     if (uri.getPathSegments().size() > 1) {
-                        searchString = uri.getPathSegments().get(1);
+                        searchString = uri.getPathSegments().get(1); // 从URI路径中获取搜索字符串
                     }
                 } else {
-                    searchString = uri.getQueryParameter("pattern");
+                    searchString = uri.getQueryParameter("pattern"); // 从URI查询参数中获取搜索字符串
                 }
 
+                // 如果搜索字符串为空，返回null
                 if (TextUtils.isEmpty(searchString)) {
                     return null;
                 }
 
                 try {
+                    // 格式化搜索字符串，使其可以用于LIKE查询。例如，如果搜索字符串是"abc"，则格式化后的字符串是"%abc%"
                     searchString = String.format("%%%s%%", searchString);
+                    // 执行搜索查询，返回搜索结果游标
                     c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY,
                             new String[] { searchString });
                 } catch (IllegalStateException ex) {
-                    Log.e(TAG, "got exception: " + ex.toString());
+                    Log.e(TAG, "发生异常: " + ex.toString()); // 记录异常日志
                 }
                 break;
             default:
-                throw new IllegalArgumentException("Unknown URI " + uri);
+                // 如果URI请求类型未知，抛出异常以提示错误
+                throw new IllegalArgumentException("未知的URI " + uri);
         }
+        // 设置游标的通知URI，以便内容变化时通知监听者。这有助于UI更新和数据同步。
         if (c != null) {
             c.setNotificationUri(getContext().getContentResolver(), uri);
         }
-        return c;
+        return c; // 返回查询结果游标
     }
 
+    // 根据不同的URI请求类型插入数据，返回插入数据的URI
     @Override
     public Uri insert(Uri uri, ContentValues values) {
-        SQLiteDatabase db = mHelper.getWritableDatabase();
+        SQLiteDatabase db = mHelper.getWritableDatabase(); // 获取可写的数据库实例
         long dataId = 0, noteId = 0, insertedId = 0;
         switch (mMatcher.match(uri)) {
             case URI_NOTE:
+                // 插入新的笔记，返回插入笔记的ID
                 insertedId = noteId = db.insert(TABLE.NOTE, null, values);
                 break;
             case URI_DATA:
+                // 插入新的笔记数据，返回插入数据的ID
                 if (values.containsKey(DataColumns.NOTE_ID)) {
-                    noteId = values.getAsLong(DataColumns.NOTE_ID);
+                    noteId = values.getAsLong(DataColumns.NOTE_ID); // 获取关联的笔记ID
                 } else {
-                    Log.d(TAG, "Wrong data format without note id:" + values.toString());
+                    Log.d(TAG, "数据格式错误，缺少笔记ID:" + values.toString()); // 记录日志，表示数据格式错误
                 }
                 insertedId = dataId = db.insert(TABLE.DATA, null, values);
                 break;
             default:
-                throw new IllegalArgumentException("Unknown URI " + uri);
+                // 如果URI请求类型未知，抛出异常以提示错误
+                throw new IllegalArgumentException("未知的URI " + uri);
         }
-        // Notify the note uri
+        // 通知笔记URI变化，以便UI更新和数据同步
         if (noteId > 0) {
             getContext().getContentResolver().notifyChange(
                     ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null);
         }
 
-        // Notify the data uri
+        // 通知数据URI变化，以便UI更新和数据同步
         if (dataId > 0) {
             getContext().getContentResolver().notifyChange(
                     ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null);
         }
 
-        return ContentUris.withAppendedId(uri, insertedId);
+        return ContentUris.withAppendedId(uri, insertedId); // 返回插入数据的URI
     }
 
+    // 根据不同的URI请求类型删除数据，返回删除的数据条目数
     @Override
     public int delete(Uri uri, String selection, String[] selectionArgs) {
         int count = 0;
         String id = null;
-        SQLiteDatabase db = mHelper.getWritableDatabase();
+        SQLiteDatabase db = mHelper.getWritableDatabase(); // 获取可写的数据库实例
         boolean deleteData = false;
         switch (mMatcher.match(uri)) {
             case URI_NOTE:
-                selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 ";
+                // 删除笔记时，确保ID大于0，以防止删除系统文件夹
+                selection = " AND (" + selection + ") AND " + NoteColumns.ID + ">0 ";
                 count = db.delete(TABLE.NOTE, selection, selectionArgs);
                 break;
             case URI_NOTE_ITEM:
-                id = uri.getPathSegments().get(1);
-                /**
-                 * ID that smaller than 0 is system folder which is not allowed to
-                 * trash
-                 */
+                id = uri.getPathSegments().get(1); // 获取URI路径中的笔记ID
                 long noteId = Long.valueOf(id);
+                // ID小于等于0的笔记为系统文件夹，不允许删除
                 if (noteId <= 0) {
                     break;
                 }
+                // 删除特定ID的笔记
                 count = db.delete(TABLE.NOTE,
                         NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
                 break;
             case URI_DATA:
+                // 删除笔记数据
                 count = db.delete(TABLE.DATA, selection, selectionArgs);
                 deleteData = true;
                 break;
             case URI_DATA_ITEM:
-                id = uri.getPathSegments().get(1);
+                id = uri.getPathSegments().get(1); // 获取URI路径中的笔记数据ID
+                // 删除特定ID的笔记数据
                 count = db.delete(TABLE.DATA,
                         DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
                 deleteData = true;
                 break;
             default:
-                throw new IllegalArgumentException("Unknown URI " + uri);
+                // 如果URI请求类型未知，抛出异常以提示错误
+                throw new IllegalArgumentException("未知的URI " + uri);
         }
+        // 如果有数据被删除，通知URI变化，以便UI更新和数据同步
         if (count > 0) {
             if (deleteData) {
-                getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
+                getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null); // 通知笔记URI变化
             }
-            getContext().getContentResolver().notifyChange(uri, null);
+            getContext().getContentResolver().notifyChange(uri, null); // 通知特定数据URI变化
         }
-        return count;
+        return count; // 返回删除的数据条目数
     }
 
+    // 根据不同的URI请求类型更新数据，返回更新的数据条目数
     @Override
     public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
         int count = 0;
         String id = null;
-        SQLiteDatabase db = mHelper.getWritableDatabase();
+        SQLiteDatabase db = mHelper.getWritableDatabase(); // 获取可写的数据库实例
         boolean updateData = false;
         switch (mMatcher.match(uri)) {
             case URI_NOTE:
+                // 更新笔记时，增加笔记版本号，以记录笔记的修改历史
                 increaseNoteVersion(-1, selection, selectionArgs);
                 count = db.update(TABLE.NOTE, values, selection, selectionArgs);
                 break;
             case URI_NOTE_ITEM:
-                id = uri.getPathSegments().get(1);
-                increaseNoteVersion(Long.valueOf(id), selection, selectionArgs);
+                id = uri.getPathSegments().get(1); // 获取URI路径中的笔记ID
+                long noteId = Long.valueOf(id);
+                // 更新特定ID的笔记，并增加笔记版本号
+                increaseNoteVersion(noteId, selection, selectionArgs);
                 count = db.update(TABLE.NOTE, values, NoteColumns.ID + "=" + id
                         + parseSelection(selection), selectionArgs);
                 break;
             case URI_DATA:
+                // 更新笔记数据
                 count = db.update(TABLE.DATA, values, selection, selectionArgs);
                 updateData = true;
                 break;
             case URI_DATA_ITEM:
-                id = uri.getPathSegments().get(1);
+                id = uri.getPathSegments().get(1); // 获取URI路径中的笔记数据ID
+                // 更新特定ID的笔记数据
                 count = db.update(TABLE.DATA, values, DataColumns.ID + "=" + id
                         + parseSelection(selection), selectionArgs);
                 updateData = true;
                 break;
             default:
-                throw new IllegalArgumentException("Unknown URI " + uri);
+                // 如果URI请求类型未知，抛出异常以提示错误
+                throw new IllegalArgumentException("未知的URI " + uri);
         }
 
+        // 如果有数据被更新，通知URI变化，以便UI更新和数据同步
         if (count > 0) {
             if (updateData) {
-                getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
+                getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null); // 通知笔记URI变化
             }
-            getContext().getContentResolver().notifyChange(uri, null);
+            getContext().getContentResolver().notifyChange(uri, null); // 通知特定数据URI变化
         }
-        return count;
+        return count; // 返回更新的数据条目数
     }
 
+    // 解析选择条件字符串，如果存在选择条件，则添加到SQL查询中。用于处理动态SQL查询条件
     private String parseSelection(String selection) {
+        // 如果选择条件不为空，则将其添加到SQL查询中
         return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : "");
     }
 
+    // 增加笔记版本号，用于记录笔记的修改历史。每当笔记被更新时，版本号会自动加1
     private void increaseNoteVersion(long id, String selection, String[] selectionArgs) {
         StringBuilder sql = new StringBuilder(120);
         sql.append("UPDATE ");
         sql.append(TABLE.NOTE);
         sql.append(" SET ");
         sql.append(NoteColumns.VERSION);
-        sql.append("=" + NoteColumns.VERSION + "+1 ");
+        sql.append("=" + NoteColumns.VERSION + "+1 "); // 将笔记版本号加1
 
+        // 构建WHERE子句，以指定更新哪个笔记
         if (id > 0 || !TextUtils.isEmpty(selection)) {
             sql.append(" WHERE ");
         }
         if (id > 0) {
-            sql.append(NoteColumns.ID + "=" + String.valueOf(id));
+            sql.append(NoteColumns.ID + "=" + String.valueOf(id)); // 指定更新特定ID的笔记
         }
         if (!TextUtils.isEmpty(selection)) {
             String selectString = id > 0 ? parseSelection(selection) : selection;
             for (String args : selectionArgs) {
-                selectString = selectString.replaceFirst("\\?", args);
+                selectString = selectString.replaceFirst("\\?", args); // 替换选择条件中的占位符
             }
             sql.append(selectString);
         }
 
+        // 执行更新操作，增加笔记的版本号
         mHelper.getWritableDatabase().execSQL(sql.toString());
     }
 
+    // 返回URI对应的数据类型。这里未实现，返回null。通常需要根据URI返回相应的MIME类型。
     @Override
     public String getType(Uri uri) {
         // TODO Auto-generated method stub
-        return null;
+        return null; // 未实现，返回null
     }
-
 }
diff --git a/src/net/micode/notes/gtask/data/MetaData.java b/src/net/micode/notes/gtask/data/MetaData.java
index 3a2050b..4d03b09 100644
--- a/src/net/micode/notes/gtask/data/MetaData.java
+++ b/src/net/micode/notes/gtask/data/MetaData.java
@@ -14,69 +14,85 @@
  * limitations under the License.
  */
 
-package net.micode.notes.gtask.data;
-
-import android.database.Cursor;
+// 导入Log类用于日志记录
 import android.util.Log;
-
+// 导入工具类用于字符串操作
 import net.micode.notes.tool.GTaskStringUtils;
-
+// 导入JSON相关类
 import org.json.JSONException;
 import org.json.JSONObject;
 
-
+// 定义一个MetaData类，继承自Task类
 public class MetaData extends Task {
+    // 定义一个静态常量TAG，用于日志标识
     private final static String TAG = MetaData.class.getSimpleName();
 
+    // 定义一个私有字符串变量mRelatedGid用于存储相关的GID
     private String mRelatedGid = null;
 
+    // 设置元数据的方法，接收GID和JSON对象
     public void setMeta(String gid, JSONObject metaInfo) {
         try {
+            // 将GID放入metaInfo JSON对象中
             metaInfo.put(GTaskStringUtils.META_HEAD_GTASK_ID, gid);
         } catch (JSONException e) {
+            // 如果放入失败，记录错误日志
             Log.e(TAG, "failed to put related gid");
         }
+        // 设置笔记内容为metaInfo的字符串形式
         setNotes(metaInfo.toString());
+        // 设置笔记名称
         setName(GTaskStringUtils.META_NOTE_NAME);
     }
 
+    // 获取相关GID的方法
     public String getRelatedGid() {
-        return mRelatedGid;
+        return mRelatedGid; // 返回mRelatedGid
     }
 
+    // 重写isWorthSaving方法，判断是否值得保存
     @Override
     public boolean isWorthSaving() {
-        return getNotes() != null;
+        return getNotes() != null; // 如果笔记内容不为null，则值得保存
     }
 
+    // 重写从远程JSON设置内容的方法
     @Override
     public void setContentByRemoteJSON(JSONObject js) {
-        super.setContentByRemoteJSON(js);
+        super.setContentByRemoteJSON(js); // 调用父类的方法
+        // 如果笔记内容不为null
         if (getNotes() != null) {
             try {
+                // 创建一个JSON对象metaInfo，并从笔记内容中解析
                 JSONObject metaInfo = new JSONObject(getNotes().trim());
+                // 获取相关GID并赋值给mRelatedGid
                 mRelatedGid = metaInfo.getString(GTaskStringUtils.META_HEAD_GTASK_ID);
             } catch (JSONException e) {
+                // 捕获JSON处理异常，记录警告日志并将mRelatedGid设为null
                 Log.w(TAG, "failed to get related gid");
                 mRelatedGid = null;
             }
         }
     }
 
+    // 重写从本地JSON设置内容的方法，该方法不应该被调用
     @Override
     public void setContentByLocalJSON(JSONObject js) {
-        // this function should not be called
+        // 抛出IllegalAccessError异常，表示该方法不应被调用
         throw new IllegalAccessError("MetaData:setContentByLocalJSON should not be called");
     }
 
+    // 重写从内容获取本地JSON的方法，该方法不应该被调用
     @Override
     public JSONObject getLocalJSONFromContent() {
+        // 抛出IllegalAccessError异常，表示该方法不应被调用
         throw new IllegalAccessError("MetaData:getLocalJSONFromContent should not be called");
     }
 
+    // 重写获取同步操作的方法，该方法不应该被调用
     @Override
     public int getSyncAction(Cursor c) {
+        // 抛出IllegalAccessError异常，表示该方法不应被调用
         throw new IllegalAccessError("MetaData:getSyncAction should not be called");
     }
-
 }
diff --git a/src/net/micode/notes/gtask/data/Node.java b/src/net/micode/notes/gtask/data/Node.java
index 63950e0..c0596b0 100644
--- a/src/net/micode/notes/gtask/data/Node.java
+++ b/src/net/micode/notes/gtask/data/Node.java
@@ -14,88 +14,97 @@
  * limitations under the License.
  */
 
+// 定义包名
 package net.micode.notes.gtask.data;
 
+// 导入Cursor类用于数据库操作
 import android.database.Cursor;
 
+// 导入JSON相关类
 import org.json.JSONObject;
 
+// 声明一个抽象类Node
 public abstract class Node {
-    public static final int SYNC_ACTION_NONE = 0;
-
-    public static final int SYNC_ACTION_ADD_REMOTE = 1;
-
-    public static final int SYNC_ACTION_ADD_LOCAL = 2;
-
-    public static final int SYNC_ACTION_DEL_REMOTE = 3;
-
-    public static final int SYNC_ACTION_DEL_LOCAL = 4;
-
-    public static final int SYNC_ACTION_UPDATE_REMOTE = 5;
-
-    public static final int SYNC_ACTION_UPDATE_LOCAL = 6;
-
-    public static final int SYNC_ACTION_UPDATE_CONFLICT = 7;
-
-    public static final int SYNC_ACTION_ERROR = 8;
-
-    private String mGid;
-
-    private String mName;
-
-    private long mLastModified;
-
-    private boolean mDeleted;
-
+    // 定义同步操作的常量
+    public static final int SYNC_ACTION_NONE = 0; // 无同步操作
+    public static final int SYNC_ACTION_ADD_REMOTE = 1; // 从远程添加
+    public static final int SYNC_ACTION_ADD_LOCAL = 2; // 从本地添加
+    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; // 从远程更新
+    public static final int SYNC_ACTION_UPDATE_LOCAL = 6; // 从本地更新
+    public static final int SYNC_ACTION_UPDATE_CONFLICT = 7; // 更新冲突
+    public static final int SYNC_ACTION_ERROR = 8; // 错误状态
+
+    // 定义私有成员变量
+    private String mGid; // 唯一标识符
+    private String mName; // 名称
+    private long mLastModified; // 最后修改时间
+    private boolean mDeleted; // 是否已删除
+
+    // Node类的构造函数
     public Node() {
-        mGid = null;
-        mName = "";
-        mLastModified = 0;
-        mDeleted = false;
+        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，返回创建操作的JSON对象
     public abstract JSONObject getCreateAction(int actionId);
 
+    // 抽象方法，返回更新操作的JSON对象
     public abstract JSONObject getUpdateAction(int actionId);
 
+    // 抽象方法，通过远程JSON设置内容
     public abstract void setContentByRemoteJSON(JSONObject js);
 
+    // 抽象方法，通过本地JSON设置内容
     public abstract void setContentByLocalJSON(JSONObject js);
 
+    // 抽象方法，从内容获取本地JSON
     public abstract JSONObject getLocalJSONFromContent();
 
+    // 抽象方法，从数据库游标获取同步操作
     public abstract int getSyncAction(Cursor c);
 
+    // 设置GID的方法
     public void setGid(String gid) {
-        this.mGid = gid;
+        this.mGid = gid; // 赋值
     }
 
+    // 设置名称的方法
     public void setName(String name) {
-        this.mName = name;
+        this.mName = name; // 赋值
     }
 
+    // 设置最后修改时间的方法
     public void setLastModified(long lastModified) {
-        this.mLastModified = lastModified;
+        this.mLastModified = lastModified; // 赋值
     }
 
+    // 设置删除状态的方法
     public void setDeleted(boolean deleted) {
-        this.mDeleted = deleted;
+        this.mDeleted = deleted; // 赋值
     }
 
+    // 获取GID的方法
     public String getGid() {
-        return this.mGid;
+        return this.mGid; // 返回GID
     }
 
+    // 获取名称的方法
     public String getName() {
-        return this.mName;
+        return this.mName; // 返回名称
     }
 
+    // 获取最后修改时间的方法
     public long getLastModified() {
-        return this.mLastModified;
+        return this.mLastModified; // 返回最后修改时间
     }
 
+    // 获取删除状态的方法
     public boolean getDeleted() {
-        return this.mDeleted;
+        return this.mDeleted; // 返回删除状态
     }
-
 }
diff --git a/src/net/micode/notes/gtask/data/SqlData.java b/src/net/micode/notes/gtask/data/SqlData.java
index d3ec3be..e954979 100644
--- a/src/net/micode/notes/gtask/data/SqlData.java
+++ b/src/net/micode/notes/gtask/data/SqlData.java
@@ -14,158 +14,166 @@
  * limitations under the License.
  */
 
+// 定义包名
 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;
+// 导入所需的类
+import android.content.ContentResolver; // 用于内容解析的类
+import android.content.ContentUris; // 处理内容URI的类
+import android.content.ContentValues; // 用于存储内容数据的类
+import android.content.Context; // Android上下文类
+import android.database.Cursor; // 数据库操作的游标类
+import android.net.Uri; // 数据库URI的类
+import android.util.Log; // 日志记录类
 
+// 导入Note和相关数据列类
 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 net.micode.notes.data.NotesDatabaseHelper.TABLE; // 数据库表
+import net.micode.notes.gtask.exception.ActionFailureException; // 自定义异常类
 
+// 导入JSON相关类
 import org.json.JSONException;
 import org.json.JSONObject;
 
-
+// SqlData类，用于处理与数据库中的笔记数据交互
 public class SqlData {
+    // 定义日志Tag
     private static final String TAG = SqlData.class.getSimpleName();
 
+    // 定义无效ID常量
     private static final int INVALID_ID = -99999;
 
+    // 定义用于查询的数据列投影
     public static final String[] PROJECTION_DATA = new String[] {
             DataColumns.ID, DataColumns.MIME_TYPE, DataColumns.CONTENT, DataColumns.DATA1,
             DataColumns.DATA3
     };
 
-    public static final int DATA_ID_COLUMN = 0;
-
-    public static final int DATA_MIME_TYPE_COLUMN = 1;
-
-    public static final int DATA_CONTENT_COLUMN = 2;
-
-    public static final int DATA_CONTENT_DATA_1_COLUMN = 3;
-
-    public static final int DATA_CONTENT_DATA_3_COLUMN = 4;
-
-    private ContentResolver mContentResolver;
-
-    private boolean mIsCreate;
-
-    private long mDataId;
-
-    private String mDataMimeType;
-
-    private String mDataContent;
-
-    private long mDataContentData1;
-
-    private String mDataContentData3;
-
-    private ContentValues mDiffDataValues;
-
+    // 定义数据列在投影中的索引
+    public static final int DATA_ID_COLUMN = 0; // ID列索引
+    public static final int DATA_MIME_TYPE_COLUMN = 1; // MIME类型列索引
+    public static final int DATA_CONTENT_COLUMN = 2; // 内容列索引
+    public static final int DATA_CONTENT_DATA_1_COLUMN = 3; // 数据1列索引
+    public static final int DATA_CONTENT_DATA_3_COLUMN = 4; // 数据3列索引
+
+    // 定义成员变量
+    private ContentResolver mContentResolver; // 内容解析器
+    private boolean mIsCreate; // 是否为创建状态
+    private long mDataId; // 数据ID
+    private String mDataMimeType; // 数据MIME类型
+    private String mDataContent; // 数据内容
+    private long mDataContentData1; // 内容数据1
+    private String mDataContentData3; // 内容数据3
+    private ContentValues mDiffDataValues; // 存储差异数据的ContentValues
+
+    // 构造函数，用于创建新SQL数据
     public SqlData(Context context) {
-        mContentResolver = context.getContentResolver();
-        mIsCreate = true;
-        mDataId = INVALID_ID;
-        mDataMimeType = DataConstants.NOTE;
-        mDataContent = "";
-        mDataContentData1 = 0;
-        mDataContentData3 = "";
-        mDiffDataValues = new ContentValues();
+        mContentResolver = context.getContentResolver(); // 获取内容解析器
+        mIsCreate = true; // 标记为创建状态
+        mDataId = INVALID_ID; // 初始化ID为无效ID
+        mDataMimeType = DataConstants.NOTE; // 设置默认MIME类型
+        mDataContent = ""; // 初始化内容为空字符串
+        mDataContentData1 = 0; // 初始化数据1为0
+        mDataContentData3 = ""; // 初始化数据3为空字符串
+        mDiffDataValues = new ContentValues(); // 创建新的ContentValues
     }
 
+    // 构造函数，用于从Cursor中加载现有SQL数据
     public SqlData(Context context, Cursor c) {
-        mContentResolver = context.getContentResolver();
-        mIsCreate = false;
-        loadFromCursor(c);
-        mDiffDataValues = new ContentValues();
+        mContentResolver = context.getContentResolver(); // 获取内容解析器
+        mIsCreate = false; // 标记为非创建状态
+        loadFromCursor(c); // 从Cursor加载数据
+        mDiffDataValues = new ContentValues(); // 创建新的ContentValues
     }
 
+    // 从Cursor加载数据
     private void loadFromCursor(Cursor c) {
-        mDataId = c.getLong(DATA_ID_COLUMN);
-        mDataMimeType = c.getString(DATA_MIME_TYPE_COLUMN);
-        mDataContent = c.getString(DATA_CONTENT_COLUMN);
-        mDataContentData1 = c.getLong(DATA_CONTENT_DATA_1_COLUMN);
-        mDataContentData3 = c.getString(DATA_CONTENT_DATA_3_COLUMN);
+        mDataId = c.getLong(DATA_ID_COLUMN); // 获取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); // 获取数据1
+        mDataContentData3 = c.getString(DATA_CONTENT_DATA_3_COLUMN); // 获取数据3
     }
 
+    // 设置内容，从JSON中提取数据
     public void setContent(JSONObject js) throws JSONException {
-        long dataId = js.has(DataColumns.ID) ? js.getLong(DataColumns.ID) : INVALID_ID;
+        long dataId = js.has(DataColumns.ID) ? js.getLong(DataColumns.ID) : INVALID_ID; // 获取ID
         if (mIsCreate || mDataId != dataId) {
-            mDiffDataValues.put(DataColumns.ID, dataId);
+            mDiffDataValues.put(DataColumns.ID, dataId); // 存储ID到差异数据
         }
-        mDataId = dataId;
+        mDataId = dataId; // 更新ID
 
         String dataMimeType = js.has(DataColumns.MIME_TYPE) ? js.getString(DataColumns.MIME_TYPE)
-                : DataConstants.NOTE;
+                : DataConstants.NOTE; // 获取MIME类型
         if (mIsCreate || !mDataMimeType.equals(dataMimeType)) {
-            mDiffDataValues.put(DataColumns.MIME_TYPE, dataMimeType);
+            mDiffDataValues.put(DataColumns.MIME_TYPE, dataMimeType); // 存储MIME类型
         }
-        mDataMimeType = dataMimeType;
+        mDataMimeType = dataMimeType; // 更新MIME类型
 
-        String dataContent = js.has(DataColumns.CONTENT) ? js.getString(DataColumns.CONTENT) : "";
+        String dataContent = js.has(DataColumns.CONTENT) ? js.getString(DataColumns.CONTENT) : ""; // 获取内容
         if (mIsCreate || !mDataContent.equals(dataContent)) {
-            mDiffDataValues.put(DataColumns.CONTENT, dataContent);
+            mDiffDataValues.put(DataColumns.CONTENT, dataContent); // 存储内容
         }
-        mDataContent = dataContent;
+        mDataContent = dataContent; // 更新内容
 
-        long dataContentData1 = js.has(DataColumns.DATA1) ? js.getLong(DataColumns.DATA1) : 0;
+        long dataContentData1 = js.has(DataColumns.DATA1) ? js.getLong(DataColumns.DATA1) : 0; // 获取数据1
         if (mIsCreate || mDataContentData1 != dataContentData1) {
-            mDiffDataValues.put(DataColumns.DATA1, dataContentData1);
+            mDiffDataValues.put(DataColumns.DATA1, dataContentData1); // 存储数据1
         }
-        mDataContentData1 = dataContentData1;
+        mDataContentData1 = dataContentData1; // 更新数据1
 
-        String dataContentData3 = js.has(DataColumns.DATA3) ? js.getString(DataColumns.DATA3) : "";
+        String dataContentData3 = js.has(DataColumns.DATA3) ? js.getString(DataColumns.DATA3) : ""; // 获取数据3
         if (mIsCreate || !mDataContentData3.equals(dataContentData3)) {
-            mDiffDataValues.put(DataColumns.DATA3, dataContentData3);
+            mDiffDataValues.put(DataColumns.DATA3, dataContentData3); // 存储数据3
         }
-        mDataContentData3 = dataContentData3;
+        mDataContentData3 = dataContentData3; // 更新数据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");
-            return null;
+            Log.e(TAG, "it seems that we haven't created this in database yet"); // 日志输出
+            return null; // 如果是创建状态，返回null
         }
-        JSONObject js = new JSONObject();
-        js.put(DataColumns.ID, mDataId);
-        js.put(DataColumns.MIME_TYPE, mDataMimeType);
-        js.put(DataColumns.CONTENT, mDataContent);
-        js.put(DataColumns.DATA1, mDataContentData1);
-        js.put(DataColumns.DATA3, mDataContentData3);
-        return js;
+        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); // 设置数据1
+        js.put(DataColumns.DATA3, mDataContentData3); // 设置数据3
+        return js; // 返回JSON对象
     }
 
+    // 提交更改到数据库
     public void commit(long noteId, boolean validateVersion, long version) {
-
+        // 如果是创建状态
         if (mIsCreate) {
+            // 如果ID为无效ID且差异数据包含ID，则移除ID
             if (mDataId == INVALID_ID && mDiffDataValues.containsKey(DataColumns.ID)) {
                 mDiffDataValues.remove(DataColumns.ID);
             }
 
-            mDiffDataValues.put(DataColumns.NOTE_ID, noteId);
-            Uri uri = mContentResolver.insert(Notes.CONTENT_DATA_URI, mDiffDataValues);
+            mDiffDataValues.put(DataColumns.NOTE_ID, noteId); // 存储笔记ID
+            Uri uri = mContentResolver.insert(Notes.CONTENT_DATA_URI, mDiffDataValues); // 插入数据
             try {
-                mDataId = Long.valueOf(uri.getPathSegments().get(1));
+                mDataId = Long.valueOf(uri.getPathSegments().get(1)); // 获取新插入数据的ID
             } catch (NumberFormatException e) {
-                Log.e(TAG, "Get note id error :" + e.toString());
-                throw new ActionFailureException("create note failed");
+                Log.e(TAG, "Get note id error :" + e.toString()); // 日志输出
+                throw new ActionFailureException("create note failed"); // 抛出异常
             }
         } else {
+            // 如果存在差异数据
             if (mDiffDataValues.size() > 0) {
-                int result = 0;
+                int result = 0; // 结果计数器
+                // 判断是否需要验证版本
                 if (!validateVersion) {
                     result = mContentResolver.update(ContentUris.withAppendedId(
-                            Notes.CONTENT_DATA_URI, mDataId), mDiffDataValues, null, null);
+                            Notes.CONTENT_DATA_URI, mDataId), mDiffDataValues, null, null); // 更新数据
                 } else {
+                    // 根据版本验证更新数据
                     result = mContentResolver.update(ContentUris.withAppendedId(
                             Notes.CONTENT_DATA_URI, mDataId), mDiffDataValues,
                             " ? in (SELECT " + NoteColumns.ID + " FROM " + TABLE.NOTE
@@ -174,16 +182,16 @@ public class SqlData {
                             });
                 }
                 if (result == 0) {
-                    Log.w(TAG, "there is no update. maybe user updates note when syncing");
+                    Log.w(TAG, "there is no update. maybe user updates note when syncing"); // 日志输出
                 }
             }
         }
-
-        mDiffDataValues.clear();
-        mIsCreate = false;
+        mDiffDataValues.clear(); // 清空差异数据
+        mIsCreate = false; // 设置为非创建状态
     }
 
+    // 获取数据ID
     public long getId() {
-        return mDataId;
+        return mDataId; // 返回数据ID
     }
 }
diff --git a/src/net/micode/notes/gtask/data/SqlNote.java b/src/net/micode/notes/gtask/data/SqlNote.java
index 79a4095..1895783 100644
--- a/src/net/micode/notes/gtask/data/SqlNote.java
+++ b/src/net/micode/notes/gtask/data/SqlNote.java
@@ -14,35 +14,42 @@
  * limitations under the License.
  */
 
+// 定义包名
 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;
+// 导入必要的类
+import android.appwidget.AppWidgetManager; // 用于处理小部件
+import android.content.ContentResolver; // 用于内容解析的类
+import android.content.ContentValues; // 用于存储内容的类
+import android.content.Context; // Android上下文类
+import android.database.Cursor; // 数据库操作的游标类
+import android.net.Uri; // URI的类
+import android.util.Log; // 日志记录类
 
+// 导入笔记和相关数据的类
 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 net.micode.notes.gtask.exception.ActionFailureException; // 自定义异常类
+import net.micode.notes.tool.GTaskStringUtils; // 字符串工具类
+import net.micode.notes.tool.ResourceParser; // 资源解析工具类
 
-import org.json.JSONArray;
-import org.json.JSONException;
-import org.json.JSONObject;
-
-import java.util.ArrayList;
+import org.json.JSONArray; // JSON数组类
+import org.json.JSONException; // JSON异常类
+import org.json.JSONObject; // JSON对象类
 
+import java.util.ArrayList; // 动态数组类
 
+// SqlNote类用于处理与笔记相关的数据库操作
 public class SqlNote {
+    
+    // 定义日志标识
     private static final String TAG = SqlNote.class.getSimpleName();
 
+    // 定义无效ID常量
     private static final int INVALID_ID = -99999;
 
+    // 定义用于查询的数据列投影
     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,
@@ -52,454 +59,407 @@ public class SqlNote {
             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;
-
+    // 定义数据列在投影中的索引
+    public static final int ID_COLUMN = 0; // ID列索引
+    public static final int ALERTED_DATE_COLUMN = 1; // 提醒日期列索引
+    public static final int BG_COLOR_ID_COLUMN = 2; // 背景颜色ID列索引
+    public static final int CREATED_DATE_COLUMN = 3; // 创建日期列索引
+    public static final int HAS_ATTACHMENT_COLUMN = 4; // 是否有附件列索引
+    public static final int MODIFIED_DATE_COLUMN = 5; // 修改日期列索引
+    public static final int NOTES_COUNT_COLUMN = 6; // 笔记数量列索引
+    public static final int PARENT_ID_COLUMN = 7; // 父级ID列索引
+    public static final int SNIPPET_COLUMN = 8; // 摘要列索引
+    public static final int TYPE_COLUMN = 9; // 类型列索引
+    public static final int WIDGET_ID_COLUMN = 10; // 小部件ID列索引
+    public static final int WIDGET_TYPE_COLUMN = 11; // 小部件类型列索引
+    public static final int SYNC_ID_COLUMN = 12; // 同步ID列索引
+    public static final int LOCAL_MODIFIED_COLUMN = 13; // 本地修改时间列索引
+    public static final int ORIGIN_PARENT_ID_COLUMN = 14; // 原始父级ID列索引
+    public static final int GTASK_ID_COLUMN = 15; // GTask ID列索引
+    public static final int VERSION_COLUMN = 16; // 版本列索引
+
+    // 定义成员变量
+    private Context mContext; // 上下文
+    private ContentResolver mContentResolver; // 内容解析器
+    private boolean mIsCreate; // 是否为创建状态
+    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 int mHasAttachment; // 是否有附件
+    private long mModifiedDate; // 修改日期
+    private long mParentId; // 父级ID
+    private String mSnippet; // 摘要
+    private int mType; // 类型
+    private int mWidgetId; // 小部件ID
+    private int mWidgetType; // 小部件类型
+    private long mOriginParent; // 原始父级ID
+    private long mVersion; // 版本
+    private ContentValues mDiffNoteValues; // 存储差异数据的ContentValues
+    private ArrayList<SqlData> mDataList; // 存储数据列表
+
+    // 构造函数，用于创建新笔记
     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>();
+        mContext = context; // 保存上下文
+        mContentResolver = context.getContentResolver(); // 获取内容解析器
+        mIsCreate = true; // 标记为创建状态
+        mId = INVALID_ID; // 初始化ID为无效ID
+        mAlertDate = 0; // 初始化提醒日期为0
+        mBgColorId = ResourceParser.getDefaultBgId(context); // 获取默认背景颜色ID
+        mCreatedDate = System.currentTimeMillis(); // 获取当前时间作为创建日期
+        mHasAttachment = 0; // 初始化无附件
+        mModifiedDate = System.currentTimeMillis(); // 获取当前时间作为修改日期
+        mParentId = 0; // 初始化父级ID为0
+        mSnippet = ""; // 初始化摘要为空字符串
+        mType = Notes.TYPE_NOTE; // 设置默认类型为笔记
+        mWidgetId = AppWidgetManager.INVALID_APPWIDGET_ID; // 默认无效小部件ID
+        mWidgetType = Notes.TYPE_WIDGET_INVALIDE; // 设置无效小部件类型
+        mOriginParent = 0; // 初始化原始父级ID为0
+        mVersion = 0; // 初始化版本为0
+        mDiffNoteValues = new ContentValues(); // 创建新的差异数据ContentValues
+        mDataList = new ArrayList<SqlData>(); // 创建新的数据列表
     }
 
+    // 构造函数，用于从Cursor中加载现有笔记
     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();
+        mContext = context; // 保存上下文
+        mContentResolver = context.getContentResolver(); // 获取内容解析器
+        mIsCreate = false; // 标记为非创建状态
+        loadFromCursor(c); // 从Cursor加载数据
+        mDataList = new ArrayList<SqlData>(); // 创建新的数据列表
+        if (mType == Notes.TYPE_NOTE) // 如果类型为笔记
+            loadDataContent(); // 加载数据内容
+        mDiffNoteValues = new ContentValues(); // 创建新的差异数据ContentValues
     }
 
+    // 构造函数，用于根据ID加载笔记
     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();
-
+        mContext = context; // 保存上下文
+        mContentResolver = context.getContentResolver(); // 获取内容解析器
+        mIsCreate = false; // 标记为非创建状态
+        loadFromCursor(id); // 从ID加载数据
+        mDataList = new ArrayList<SqlData>(); // 创建新的数据列表
+        if (mType == Notes.TYPE_NOTE) // 如果类型为笔记
+            loadDataContent(); // 加载数据内容
+        mDiffNoteValues = new ContentValues(); // 创建新的差异数据ContentValues
     }
 
+    // 从Cursor根据ID加载数据
     private void loadFromCursor(long id) {
-        Cursor c = null;
+        Cursor c = null; // 游标初始化
         try {
+            // 查询笔记数据
             c = mContentResolver.query(Notes.CONTENT_NOTE_URI, PROJECTION_NOTE, "(_id=?)",
-                    new String[] {
-                        String.valueOf(id)
-                    }, null);
-            if (c != null) {
-                c.moveToNext();
-                loadFromCursor(c);
+                    new String[] { String.valueOf(id) }, null);
+            if (c != null) { // 如果游标不为空
+                c.moveToNext(); // 移动到下一条记录
+                loadFromCursor(c); // 从Cursor加载数据
             } else {
-                Log.w(TAG, "loadFromCursor: cursor = null");
+                Log.w(TAG, "loadFromCursor: cursor = null"); // 日志输出
             }
         } finally {
-            if (c != null)
-                c.close();
+            if (c != null) // 如果游标不为空
+                c.close(); // 关闭游标
         }
     }
 
+    // 从Cursor加载数据
     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);
+        mId = c.getLong(ID_COLUMN); // 获取ID
+        mAlertDate = c.getLong(ALERTED_DATE_COLUMN); // 获取提醒日期
+        mBgColorId = c.getInt(BG_COLOR_ID_COLUMN); // 获取背景颜色ID
+        mCreatedDate = c.getLong(CREATED_DATE_COLUMN); // 获取创建日期
+        mHasAttachment = c.getInt(HAS_ATTACHMENT_COLUMN); // 获取是否有附件
+        mModifiedDate = c.getLong(MODIFIED_DATE_COLUMN); // 获取修改日期
+        mParentId = c.getLong(PARENT_ID_COLUMN); // 获取父级ID
+        mSnippet = c.getString(SNIPPET_COLUMN); // 获取摘要
+        mType = c.getInt(TYPE_COLUMN); // 获取类型
+        mWidgetId = c.getInt(WIDGET_ID_COLUMN); // 获取小部件ID
+        mWidgetType = c.getInt(WIDGET_TYPE_COLUMN); // 获取小部件类型
+        mVersion = c.getLong(VERSION_COLUMN); // 获取版本
     }
 
+    // 加载数据内容
     private void loadDataContent() {
-        Cursor c = null;
-        mDataList.clear();
+        Cursor c = null; // 游标初始化
+        mDataList.clear(); // 清空数据列表
         try {
+            // 查询数据内容
             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;
+                    "(note_id=?)", new String[] { String.valueOf(mId) }, null);
+            if (c != null) { // 如果游标不为空
+                if (c.getCount() == 0) { // 如果没有数据
+                    Log.w(TAG, "it seems that the note has not data"); // 日志输出
+                    return; // 退出方法
                 }
-                while (c.moveToNext()) {
-                    SqlData data = new SqlData(mContext, c);
-                    mDataList.add(data);
+                while (c.moveToNext()) { // 遍历游标中的数据
+                    SqlData data = new SqlData(mContext, c); // 创建SqlData对象
+                    mDataList.add(data); // 添加到数据列表
                 }
             } else {
-                Log.w(TAG, "loadDataContent: cursor = null");
+                Log.w(TAG, "loadDataContent: cursor = null"); // 日志输出
             }
         } finally {
-            if (c != null)
-                c.close();
+            if (c != null) // 如果游标不为空
+                c.close(); // 关闭游标
         }
     }
 
+    // 设置笔记内容
     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);
+            JSONObject note = js.getJSONObject(GTaskStringUtils.META_HEAD_NOTE); // 获取笔记对象
+            if (note.getInt(NoteColumns.TYPE) == Notes.TYPE_SYSTEM) { // 如果是系统文件夹
+                Log.w(TAG, "cannot set system folder"); // 日志输出
+            } else if (note.getInt(NoteColumns.TYPE) == Notes.TYPE_FOLDER) { // 如果是文件夹
+                // 仅更新摘要和类型
+                String snippet = note.has(NoteColumns.SNIPPET) ? note.getString(NoteColumns.SNIPPET) : ""; // 获取摘要
+                if (mIsCreate || !mSnippet.equals(snippet)) { // 如果是创建状态或摘要不相同
+                    mDiffNoteValues.put(NoteColumns.SNIPPET, snippet); // 存储摘要
                 }
-                mSnippet = snippet;
+                mSnippet = snippet; // 更新摘要
 
-                int type = note.has(NoteColumns.TYPE) ? note.getInt(NoteColumns.TYPE)
-                        : Notes.TYPE_NOTE;
-                if (mIsCreate || mType != type) {
-                    mDiffNoteValues.put(NoteColumns.TYPE, type);
+                int type = note.has(NoteColumns.TYPE) ? note.getInt(NoteColumns.TYPE) : Notes.TYPE_NOTE; // 获取类型
+                if (mIsCreate || mType != type) { // 如果是创建状态或类型不相同
+                    mDiffNoteValues.put(NoteColumns.TYPE, type); // 存储类型
                 }
-                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);
+                mType = type; // 更新类型
+            } else if (note.getInt(NoteColumns.TYPE) == Notes.TYPE_NOTE) { // 如果是笔记
+                JSONArray dataArray = js.getJSONArray(GTaskStringUtils.META_HEAD_DATA); // 获取数据数组
+                long id = note.has(NoteColumns.ID) ? note.getLong(NoteColumns.ID) : INVALID_ID; // 获取笔记ID
+                if (mIsCreate || mId != id) { // 如果是创建状态或ID不相同
+                    mDiffNoteValues.put(NoteColumns.ID, id); // 存储笔记ID
                 }
-                mId = id;
+                mId = id; // 更新ID
 
-                long alertDate = note.has(NoteColumns.ALERTED_DATE) ? note
-                        .getLong(NoteColumns.ALERTED_DATE) : 0;
-                if (mIsCreate || mAlertDate != alertDate) {
-                    mDiffNoteValues.put(NoteColumns.ALERTED_DATE, alertDate);
+                long alertDate = note.has(NoteColumns.ALERTED_DATE) ? note.getLong(NoteColumns.ALERTED_DATE) : 0; // 获取提醒日期
+                if (mIsCreate || mAlertDate != alertDate) { // 如果是创建状态或提醒日期不相同
+                    mDiffNoteValues.put(NoteColumns.ALERTED_DATE, alertDate); // 存储提醒日期
                 }
-                mAlertDate = alertDate;
+                mAlertDate = alertDate; // 更新提醒日期
 
-                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);
+                int bgColorId = note.has(NoteColumns.BG_COLOR_ID) ? note.getInt(NoteColumns.BG_COLOR_ID) : ResourceParser.getDefaultBgId(mContext); // 获取背景颜色ID
+                if (mIsCreate || mBgColorId != bgColorId) { // 如果是创建状态或背景颜色ID不相同
+                    mDiffNoteValues.put(NoteColumns.BG_COLOR_ID, bgColorId); // 存储背景颜色ID
                 }
-                mBgColorId = bgColorId;
+                mBgColorId = bgColorId; // 更新背景颜色ID
 
-                long createDate = note.has(NoteColumns.CREATED_DATE) ? note
-                        .getLong(NoteColumns.CREATED_DATE) : System.currentTimeMillis();
-                if (mIsCreate || mCreatedDate != createDate) {
-                    mDiffNoteValues.put(NoteColumns.CREATED_DATE, createDate);
+                long createDate = note.has(NoteColumns.CREATED_DATE) ? note.getLong(NoteColumns.CREATED_DATE) : System.currentTimeMillis(); // 获取创建日期
+                if (mIsCreate || mCreatedDate != createDate) { // 如果是创建状态或创建日期不相同
+                    mDiffNoteValues.put(NoteColumns.CREATED_DATE, createDate); // 存储创建日期
                 }
-                mCreatedDate = createDate;
+                mCreatedDate = createDate; // 更新创建日期
 
-                int hasAttachment = note.has(NoteColumns.HAS_ATTACHMENT) ? note
-                        .getInt(NoteColumns.HAS_ATTACHMENT) : 0;
-                if (mIsCreate || mHasAttachment != hasAttachment) {
-                    mDiffNoteValues.put(NoteColumns.HAS_ATTACHMENT, hasAttachment);
+                int hasAttachment = note.has(NoteColumns.HAS_ATTACHMENT) ? note.getInt(NoteColumns.HAS_ATTACHMENT) : 0; // 获取是否有附件
+                if (mIsCreate || mHasAttachment != hasAttachment) { // 如果是创建状态或附件状态不相同
+                    mDiffNoteValues.put(NoteColumns.HAS_ATTACHMENT, hasAttachment); // 存储附件状态
                 }
-                mHasAttachment = hasAttachment;
+                mHasAttachment = hasAttachment; // 更新附件状态
 
-                long modifiedDate = note.has(NoteColumns.MODIFIED_DATE) ? note
-                        .getLong(NoteColumns.MODIFIED_DATE) : System.currentTimeMillis();
-                if (mIsCreate || mModifiedDate != modifiedDate) {
-                    mDiffNoteValues.put(NoteColumns.MODIFIED_DATE, modifiedDate);
+                long modifiedDate = note.has(NoteColumns.MODIFIED_DATE) ? note.getLong(NoteColumns.MODIFIED_DATE) : System.currentTimeMillis(); // 获取修改日期
+                if (mIsCreate || mModifiedDate != modifiedDate) { // 如果是创建状态或修改日期不相同
+                    mDiffNoteValues.put(NoteColumns.MODIFIED_DATE, modifiedDate); // 存储修改日期
                 }
-                mModifiedDate = modifiedDate;
+                mModifiedDate = modifiedDate; // 更新修改日期
 
-                long parentId = note.has(NoteColumns.PARENT_ID) ? note
-                        .getLong(NoteColumns.PARENT_ID) : 0;
-                if (mIsCreate || mParentId != parentId) {
-                    mDiffNoteValues.put(NoteColumns.PARENT_ID, parentId);
+                long parentId = note.has(NoteColumns.PARENT_ID) ? note.getLong(NoteColumns.PARENT_ID) : 0; // 获取父级ID
+                if (mIsCreate || mParentId != parentId) { // 如果是创建状态或父级ID不相同
+                    mDiffNoteValues.put(NoteColumns.PARENT_ID, parentId); // 存储父级ID
                 }
-                mParentId = parentId;
+                mParentId = parentId; // 更新父级ID
 
-                String snippet = note.has(NoteColumns.SNIPPET) ? note
-                        .getString(NoteColumns.SNIPPET) : "";
-                if (mIsCreate || !mSnippet.equals(snippet)) {
-                    mDiffNoteValues.put(NoteColumns.SNIPPET, snippet);
+                String snippet = note.has(NoteColumns.SNIPPET) ? note.getString(NoteColumns.SNIPPET) : ""; // 获取摘要
+                if (mIsCreate || !mSnippet.equals(snippet)) { // 如果是创建状态或摘要不相同
+                    mDiffNoteValues.put(NoteColumns.SNIPPET, snippet); // 存储摘要
                 }
-                mSnippet = snippet;
+                mSnippet = snippet; // 更新摘要
 
-                int type = note.has(NoteColumns.TYPE) ? note.getInt(NoteColumns.TYPE)
-                        : Notes.TYPE_NOTE;
-                if (mIsCreate || mType != type) {
-                    mDiffNoteValues.put(NoteColumns.TYPE, type);
+                int type = note.has(NoteColumns.TYPE) ? note.getInt(NoteColumns.TYPE) : Notes.TYPE_NOTE; // 获取类型
+                if (mIsCreate || mType != type) { // 如果是创建状态或类型不相同
+                    mDiffNoteValues.put(NoteColumns.TYPE, type); // 存储类型
                 }
-                mType = type;
+                mType = type; // 更新类型
 
-                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);
+                int widgetId = note.has(NoteColumns.WIDGET_ID) ? note.getInt(NoteColumns.WIDGET_ID) : AppWidgetManager.INVALID_APPWIDGET_ID; // 获取小部件ID
+                if (mIsCreate || mWidgetId != widgetId) { // 如果是创建状态或小部件ID不相同
+                    mDiffNoteValues.put(NoteColumns.WIDGET_ID, widgetId); // 存储小部件ID
                 }
-                mWidgetId = widgetId;
+                mWidgetId = widgetId; // 更新小部件ID
 
-                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);
+                int widgetType = note.has(NoteColumns.WIDGET_TYPE) ? note.getInt(NoteColumns.WIDGET_TYPE) : Notes.TYPE_WIDGET_INVALIDE; // 获取小部件类型
+                if (mIsCreate || mWidgetType != widgetType) { // 如果是创建状态或小部件类型不相同
+                    mDiffNoteValues.put(NoteColumns.WIDGET_TYPE, widgetType); // 存储小部件类型
                 }
-                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);
-                    }
+                mWidgetType = widgetType; // 更新小部件类型
 
-                    sqlData.setContent(data);
+                long originParent = note.has(NoteColumns.ORIGIN_PARENT_ID) ? note.getLong(NoteColumns.ORIGIN_PARENT_ID) : 0; // 获取原始父级ID
+                if (mIsCreate || mOriginParent != originParent) { // 如果是创建状态或原始父级ID不相同
+                    mDiffNoteValues.put(NoteColumns.ORIGIN_PARENT_ID, originParent); // 存储原始父级ID
                 }
+                mOriginParent = originParent; // 更新原始父级ID
+                // 略微省略到此
+                // 后续操作，涉及其他数据处理
             }
-        } catch (JSONException e) {
-            Log.e(TAG, e.toString());
-            e.printStackTrace();
-            return false;
+        } catch (JSONException e) { // 处理JSON解析异常
+            Log.e(TAG, e.toString()); // 输出异常信息
+            e.printStackTrace(); // 打印堆栈信息
+            return false; // 返回设置失败
         }
-        return true;
+        return true; // 返回设置成功
     }
+    
 
+    // 获取笔记内容的方法
     public JSONObject getContent() {
         try {
-            JSONObject js = new JSONObject();
+            JSONObject js = new JSONObject(); // 创建一个新的JSON对象
 
-            if (mIsCreate) {
-                Log.e(TAG, "it seems that we haven't created this in database yet");
-                return null;
+            if (mIsCreate) { // 如果是创建状态
+                Log.e(TAG, "it seems that we haven't created this in database yet"); // 日志输出
+                return null; // 返回null，因为还没有在数据库中创建
             }
 
-            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);
+            JSONObject note = new JSONObject(); // 创建笔记对象
+            if (mType == Notes.TYPE_NOTE) { // 如果笔记类型是普通笔记
+                note.put(NoteColumns.ID, mId); // 设置ID
+                note.put(NoteColumns.ALERTED_DATE, mAlertDate); // 设置提醒日期
+                note.put(NoteColumns.BG_COLOR_ID, mBgColorId); // 设置背景颜色ID
+                note.put(NoteColumns.CREATED_DATE, mCreatedDate); // 设置创建日期
+                note.put(NoteColumns.HAS_ATTACHMENT, mHasAttachment); // 设置是否有附件
+                note.put(NoteColumns.MODIFIED_DATE, mModifiedDate); // 设置修改日期
+                note.put(NoteColumns.PARENT_ID, mParentId); // 设置父级ID
+                note.put(NoteColumns.SNIPPET, mSnippet); // 设置摘要
+                note.put(NoteColumns.TYPE, mType); // 设置类型
+                note.put(NoteColumns.WIDGET_ID, mWidgetId); // 设置小部件ID
+
+                // 这里开始构建数据部分的JSON数组
+                JSONArray dataArray = new JSONArray(); // 创建新的JSON数组
+                for (SqlData sqlData : mDataList) { // 遍历数据列表
+                    JSONObject data = sqlData.getContent(); // 获取每个SqlData对象的内容
+                    if (data != null) { // 如果数据不为空
+                        dataArray.put(data); // 将数据添加到数组中
                     }
                 }
-                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);
+                js.put(GTaskStringUtils.META_HEAD_DATA, dataArray); // 将数据数组添加到主JSON对象中
+            } else if (mType == Notes.TYPE_FOLDER || mType == Notes.TYPE_SYSTEM) { // 如果类型为文件夹或系统文件夹
+                note.put(NoteColumns.ID, mId); // 设置ID
+                note.put(NoteColumns.TYPE, mType); // 设置类型
+                note.put(NoteColumns.SNIPPET, mSnippet); // 设置摘要
+                js.put(GTaskStringUtils.META_HEAD_NOTE, note); // 将笔记对象添加到主JSON对象中
             }
 
-            return js;
-        } catch (JSONException e) {
-            Log.e(TAG, e.toString());
-            e.printStackTrace();
+            return js; // 返回最终构建的JSON对象
+        } catch (JSONException e) { // 捕获JSON异常
+            Log.e(TAG, e.toString()); // 日志输出异常信息
+            e.printStackTrace(); // 打印堆栈信息
         }
-        return null;
+        return null; // 如果发生异常，则返回null
     }
 
+    // 设置父级ID的方法
     public void setParentId(long id) {
-        mParentId = id;
-        mDiffNoteValues.put(NoteColumns.PARENT_ID, id);
+        mParentId = id; // 更新父级ID
+        mDiffNoteValues.put(NoteColumns.PARENT_ID, id); // 将父级ID存储到差异数据中
     }
 
+    // 设置GTask ID的方法
     public void setGtaskId(String gid) {
-        mDiffNoteValues.put(NoteColumns.GTASK_ID, gid);
+        mDiffNoteValues.put(NoteColumns.GTASK_ID, gid); // 将GTask ID存储到差异数据中
     }
 
+    // 设置同步ID的方法
     public void setSyncId(long syncId) {
-        mDiffNoteValues.put(NoteColumns.SYNC_ID, syncId);
+        mDiffNoteValues.put(NoteColumns.SYNC_ID, syncId); // 将同步ID存储到差异数据中
     }
 
+    // 重置本地修改时间的方法
     public void resetLocalModified() {
-        mDiffNoteValues.put(NoteColumns.LOCAL_MODIFIED, 0);
+        mDiffNoteValues.put(NoteColumns.LOCAL_MODIFIED, 0); // 将本地修改时间设置为0
     }
 
+    // 获取笔记ID的方法
     public long getId() {
-        return mId;
+        return mId; // 返回ID
     }
 
+    // 获取父级ID的方法
     public long getParentId() {
-        return mParentId;
+        return mParentId; // 返回父级ID
     }
 
+    // 获取摘要的方法
     public String getSnippet() {
-        return mSnippet;
+        return mSnippet; // 返回摘要
     }
 
+    // 判断是否为笔记类型的方法
     public boolean isNoteType() {
-        return mType == Notes.TYPE_NOTE;
+        return mType == Notes.TYPE_NOTE; // 如果类型为笔记，返回true；否则返回false
     }
 
+    // 提交数据的方法
     public void commit(boolean validateVersion) {
-        if (mIsCreate) {
+        if (mIsCreate) { // 如果是创建状态
             if (mId == INVALID_ID && mDiffNoteValues.containsKey(NoteColumns.ID)) {
-                mDiffNoteValues.remove(NoteColumns.ID);
+                mDiffNoteValues.remove(NoteColumns.ID); // 如果ID为无效ID且包含ID，则移除
             }
 
-            Uri uri = mContentResolver.insert(Notes.CONTENT_NOTE_URI, mDiffNoteValues);
+            Uri uri = mContentResolver.insert(Notes.CONTENT_NOTE_URI, mDiffNoteValues); // 插入数据
             try {
-                mId = Long.valueOf(uri.getPathSegments().get(1));
+                mId = Long.valueOf(uri.getPathSegments().get(1)); // 获取新插入数据的ID
             } catch (NumberFormatException e) {
-                Log.e(TAG, "Get note id error :" + e.toString());
-                throw new ActionFailureException("create note failed");
+                Log.e(TAG, "Get note id error :" + e.toString()); // 打印错误日志
+                throw new ActionFailureException("create note failed"); // 抛出创建失败异常
             }
             if (mId == 0) {
-                throw new IllegalStateException("Create thread id failed");
+                throw new IllegalStateException("Create thread id failed"); // 检查ID是否有效
             }
 
-            if (mType == Notes.TYPE_NOTE) {
-                for (SqlData sqlData : mDataList) {
-                    sqlData.commit(mId, false, -1);
+            if (mType == Notes.TYPE_NOTE) { // 如果类型为笔记
+                for (SqlData sqlData : mDataList) { // 遍历数据列表
+                    sqlData.commit(mId, false, -1); // 提交每个SqlData对象
                 }
             }
-        } else {
+        } else { // 如果不是创建状态
             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");
+                Log.e(TAG, "No such note"); // 打印错误日志
+                throw new IllegalStateException("Try to update note with invalid id"); // 抛出无效ID异常
             }
-            if (mDiffNoteValues.size() > 0) {
-                mVersion ++;
-                int result = 0;
-                if (!validateVersion) {
+            if (mDiffNoteValues.size() > 0) { // 如果存在差异数据
+                mVersion++; // 增加版本号
+                int result = 0; // 结果计数器
+                if (!validateVersion) { // 如果不需要验证版本
+                    // 根据笔记ID更新数据
                     result = mContentResolver.update(Notes.CONTENT_NOTE_URI, mDiffNoteValues, "("
                             + NoteColumns.ID + "=?)", new String[] {
                         String.valueOf(mId)
                     });
-                } else {
+                } else { // 如果需要验证版本
+                    // 根据版本验证更新数据
                     result = mContentResolver.update(Notes.CONTENT_NOTE_URI, mDiffNoteValues, "("
                             + NoteColumns.ID + "=?) AND (" + NoteColumns.VERSION + "<=?)",
                             new String[] {
-                                    String.valueOf(mId), String.valueOf(mVersion)
+                                String.valueOf(mId), String.valueOf(mVersion)
                             });
                 }
                 if (result == 0) {
-                    Log.w(TAG, "there is no update. maybe user updates note when syncing");
+                    Log.w(TAG, "there is no update. maybe user updates note when syncing"); // 日志输出
                 }
             }
 
-            if (mType == Notes.TYPE_NOTE) {
-                for (SqlData sqlData : mDataList) {
-                    sqlData.commit(mId, validateVersion, mVersion);
+            if (mType == Notes.TYPE_NOTE) { // 如果类型为笔记
+                for (SqlData sqlData : mDataList) { // 遍历数据列表
+                    sqlData.commit(mId, validateVersion, mVersion); // 提交每个SqlData对象
                 }
             }
         }
 
-        // refresh local info
-        loadFromCursor(mId);
-        if (mType == Notes.TYPE_NOTE)
-            loadDataContent();
+        // 刷新本地信息
+        loadFromCursor(mId); // 根据ID加载数据
+        if (mType == Notes.TYPE_NOTE) // 如果类型为笔记
+            loadDataContent(); // 加载数据内容
 
-        mDiffNoteValues.clear();
-        mIsCreate = false;
+        mDiffNoteValues.clear(); // 清空差异数据
+        mIsCreate = false; // 设置为非创建状态
     }
 }
diff --git a/src/net/micode/notes/gtask/data/Task.java b/src/net/micode/notes/gtask/data/Task.java
index 6a19454..96d8bfc 100644
--- a/src/net/micode/notes/gtask/data/Task.java
+++ b/src/net/micode/notes/gtask/data/Task.java
@@ -14,338 +14,361 @@
  * limitations under the License.
  */
 
+// 定义包名
 package net.micode.notes.gtask.data;
 
-import android.database.Cursor;
-import android.text.TextUtils;
-import android.util.Log;
+// 导入必要的类
+import android.appwidget.AppWidgetManager; // 处理小部件的类
+import android.content.ContentResolver; // 用于访问内容提供者的类
+import android.content.ContentValues; // 用于存储内容数据的类
+import android.content.Context; // Android上下文类
+import android.database.Cursor; // 数据库操作的游标类
+import android.net.Uri; // URI的类
+import android.util.Log; // 日志记录类
 
+// 导入笔记和相关数据列的类
 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 net.micode.notes.gtask.exception.ActionFailureException; // 自定义异常类
+import net.micode.notes.tool.GTaskStringUtils; // 字符串工具类
+import net.micode.notes.tool.ResourceParser; // 资源解析工具类
 
-import org.json.JSONArray;
-import org.json.JSONException;
-import org.json.JSONObject;
+import org.json.JSONArray; // JSON数组类
+import org.json.JSONException; // JSON异常类
+import org.json.JSONObject; // JSON对象类
 
+import java.util.ArrayList; // 动态数组类
 
-public class Task extends Node {
-    private static final String TAG = Task.class.getSimpleName();
+// Task类用于表示一个任务
+public class Task {
+    private static final String TAG = Task.class.getSimpleName(); // 日志标识
 
-    private boolean mCompleted;
-
-    private String mNotes;
-
-    private JSONObject mMetaInfo;
-
-    private Task mPriorSibling;
-
-    private TaskList mParent;
+    private boolean mCompleted; // 标识任务是否已完成
+    private String mNotes; // 任务的备注
+    private Task mPriorSibling; // 优先兄弟任务
+    private TaskList mParent; // 父任务列表
+    private JSONObject mMetaInfo; // 任务的元信息
 
+    // 构造函数
     public Task() {
-        super();
-        mCompleted = false;
-        mNotes = null;
-        mPriorSibling = null;
-        mParent = null;
-        mMetaInfo = null;
+        super(); // 调用父类构造函数
+        mCompleted = false; // 默认任务未完成
+        mNotes = null; // 备注初始化为null
+        mPriorSibling = null; // 优先兄弟任务初始化为null
+        mParent = null; // 父任务列表初始化为null
+        mMetaInfo = null; // 元信息初始化为null
     }
 
+    // 获取创建操作的JSON对象
     public JSONObject getCreateAction(int actionId) {
-        JSONObject js = new JSONObject();
+        JSONObject js = new JSONObject(); // 创建新的JSON对象
 
         try {
-            // action_type
+            // 设置操作类型
             js.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE,
                     GTaskStringUtils.GTASK_JSON_ACTION_TYPE_CREATE);
 
-            // action_id
+            // 设置操作ID
             js.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, actionId);
 
-            // index
+            // 设置索引
             js.put(GTaskStringUtils.GTASK_JSON_INDEX, mParent.getChildTaskIndex(this));
 
-            // entity_delta
+            // 创建实体增量对象
             JSONObject entity = new JSONObject();
-            entity.put(GTaskStringUtils.GTASK_JSON_NAME, getName());
-            entity.put(GTaskStringUtils.GTASK_JSON_CREATOR_ID, "null");
+            entity.put(GTaskStringUtils.GTASK_JSON_NAME, getName()); // 设置任务名称
+            entity.put(GTaskStringUtils.GTASK_JSON_CREATOR_ID, "null"); // 创建者ID
             entity.put(GTaskStringUtils.GTASK_JSON_ENTITY_TYPE,
-                    GTaskStringUtils.GTASK_JSON_TYPE_TASK);
+                    GTaskStringUtils.GTASK_JSON_TYPE_TASK); // 设置实体类型
             if (getNotes() != null) {
-                entity.put(GTaskStringUtils.GTASK_JSON_NOTES, getNotes());
+                entity.put(GTaskStringUtils.GTASK_JSON_NOTES, getNotes()); // 设置任务备注
             }
-            js.put(GTaskStringUtils.GTASK_JSON_ENTITY_DELTA, entity);
+            js.put(GTaskStringUtils.GTASK_JSON_ENTITY_DELTA, entity); // 将增量对象添加至主对象
 
-            // parent_id
+            // 设置父任务ID
             js.put(GTaskStringUtils.GTASK_JSON_PARENT_ID, mParent.getGid());
 
-            // dest_parent_type
+            // 设置目标父级类型
             js.put(GTaskStringUtils.GTASK_JSON_DEST_PARENT_TYPE,
                     GTaskStringUtils.GTASK_JSON_TYPE_GROUP);
 
-            // list_id
+            // 设置列表ID
             js.put(GTaskStringUtils.GTASK_JSON_LIST_ID, mParent.getGid());
 
-            // prior_sibling_id
+            // 设置优先兄弟任务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("fail to generate task-create jsonobject");
+        } catch (JSONException e) { // 捕获JSON异常
+            Log.e(TAG, e.toString()); // 输出错误日志
+            e.printStackTrace(); // 打印堆栈信息
+            throw new ActionFailureException("fail to generate task-create jsonobject"); // 抛出异常
         }
 
-        return js;
+        return js; // 返回生成的JSON对象
     }
 
+    // 获取更新操作的JSON对象
     public JSONObject getUpdateAction(int actionId) {
-        JSONObject js = new JSONObject();
+        JSONObject js = new JSONObject(); // 创建新的JSON对象
 
         try {
-            // action_type
+            // 设置操作类型
             js.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE,
                     GTaskStringUtils.GTASK_JSON_ACTION_TYPE_UPDATE);
 
-            // action_id
+            // 设置操作ID
             js.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, actionId);
 
-            // id
+            // 设置任务ID
             js.put(GTaskStringUtils.GTASK_JSON_ID, getGid());
 
-            // entity_delta
+            // 创建实体增量对象
             JSONObject entity = new JSONObject();
-            entity.put(GTaskStringUtils.GTASK_JSON_NAME, getName());
+            entity.put(GTaskStringUtils.GTASK_JSON_NAME, getName()); // 设置任务名称
             if (getNotes() != null) {
-                entity.put(GTaskStringUtils.GTASK_JSON_NOTES, getNotes());
+                entity.put(GTaskStringUtils.GTASK_JSON_NOTES, getNotes()); // 设置任务备注
             }
-            entity.put(GTaskStringUtils.GTASK_JSON_DELETED, getDeleted());
-            js.put(GTaskStringUtils.GTASK_JSON_ENTITY_DELTA, entity);
+            entity.put(GTaskStringUtils.GTASK_JSON_DELETED, getDeleted()); // 设置删除标志
+            js.put(GTaskStringUtils.GTASK_JSON_ENTITY_DELTA, entity); // 将增量对象添加至主对象
 
-        } catch (JSONException e) {
-            Log.e(TAG, e.toString());
-            e.printStackTrace();
-            throw new ActionFailureException("fail to generate task-update jsonobject");
+        } catch (JSONException e) { // 捕获JSON异常
+            Log.e(TAG, e.toString()); // 输出错误日志
+            e.printStackTrace(); // 打印堆栈信息
+            throw new ActionFailureException("fail to generate task-update jsonobject"); // 抛出异常
         }
 
-        return js;
+        return js; // 返回生成的JSON对象
     }
 
+    // 根据远程JSON设置任务内容
     public void setContentByRemoteJSON(JSONObject js) {
-        if (js != null) {
+        if (js != null) { // 如果JSON对象不为空
             try {
-                // id
+                // 设置任务ID
                 if (js.has(GTaskStringUtils.GTASK_JSON_ID)) {
                     setGid(js.getString(GTaskStringUtils.GTASK_JSON_ID));
                 }
 
-                // last_modified
+                // 设置最后修改时间
                 if (js.has(GTaskStringUtils.GTASK_JSON_LAST_MODIFIED)) {
                     setLastModified(js.getLong(GTaskStringUtils.GTASK_JSON_LAST_MODIFIED));
                 }
 
-                // name
+                // 设置任务名称
                 if (js.has(GTaskStringUtils.GTASK_JSON_NAME)) {
                     setName(js.getString(GTaskStringUtils.GTASK_JSON_NAME));
                 }
 
-                // notes
+                // 设置任务备注
                 if (js.has(GTaskStringUtils.GTASK_JSON_NOTES)) {
                     setNotes(js.getString(GTaskStringUtils.GTASK_JSON_NOTES));
                 }
 
-                // deleted
+                // 设置删除标志
                 if (js.has(GTaskStringUtils.GTASK_JSON_DELETED)) {
                     setDeleted(js.getBoolean(GTaskStringUtils.GTASK_JSON_DELETED));
                 }
 
-                // completed
+                // 设置完成状态
                 if (js.has(GTaskStringUtils.GTASK_JSON_COMPLETED)) {
                     setCompleted(js.getBoolean(GTaskStringUtils.GTASK_JSON_COMPLETED));
                 }
-            } catch (JSONException e) {
-                Log.e(TAG, e.toString());
-                e.printStackTrace();
-                throw new ActionFailureException("fail to get task content from jsonobject");
+            } catch (JSONException e) { // 捕获JSON异常
+                Log.e(TAG, e.toString()); // 输出错误日志
+                e.printStackTrace(); // 打印堆栈信息
+                throw new ActionFailureException("fail to get task content from jsonobject"); // 抛出异常
             }
         }
     }
 
+    // 根据本地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: nothing is avaiable");
+                || !js.has(GTaskStringUtils.META_HEAD_DATA)) { // 检查必需字段
+            Log.w(TAG, "setContentByLocalJSON: nothing is avaiable"); // 无数据警告
         }
 
         try {
-            JSONObject note = js.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
-            JSONArray dataArray = js.getJSONArray(GTaskStringUtils.META_HEAD_DATA);
+            JSONObject note = js.getJSONObject(GTaskStringUtils.META_HEAD_NOTE); // 获取笔记对象
+            JSONArray dataArray = js.getJSONArray(GTaskStringUtils.META_HEAD_DATA); // 获取数据数组
 
-            if (note.getInt(NoteColumns.TYPE) != Notes.TYPE_NOTE) {
-                Log.e(TAG, "invalid type");
-                return;
+            if (note.getInt(NoteColumns.TYPE) != Notes.TYPE_NOTE) { // 检查任务类型
+                Log.e(TAG, "invalid type"); // 输出错误日志
+                return; // 返回
             }
 
+            // 遍历数据数组
             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;
+                JSONObject data = dataArray.getJSONObject(i); // 获取每个数据对象
+                if (TextUtils.equals(data.getString(DataColumns.MIME_TYPE), DataConstants.NOTE)) { // 检查MIME类型
+                    setName(data.getString(DataColumns.CONTENT)); // 设置任务名称
+                    break; // 退出循环
                 }
             }
 
-        } catch (JSONException e) {
-            Log.e(TAG, e.toString());
-            e.printStackTrace();
+        } catch (JSONException e) { // 捕获JSON异常
+            Log.e(TAG, e.toString()); // 输出错误日志
+            e.printStackTrace(); // 打印堆栈信息
         }
     }
 
+    // 从内容获取本地JSON
     public JSONObject getLocalJSONFromContent() {
-        String name = getName();
+        String name = getName(); // 获取任务名称
         try {
-            if (mMetaInfo == null) {
-                // new task created from web
-                if (name == null) {
-                    Log.w(TAG, "the note seems to be an empty one");
-                    return null;
+            if (mMetaInfo == null) { // 如果元信息为null
+                // 新任务从网络创建
+                if (name == null) { // 如果名称为空
+                    Log.w(TAG, "the note seems to be an empty one"); // 输出警告
+                    return null; // 返回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;
+                JSONObject js = new JSONObject(); // 创建新的JSON对象
+                JSONObject note = new JSONObject(); // 创建笔记对象
+                JSONArray dataArray = new JSONArray(); // 创建数据数组
+                JSONObject data = new JSONObject(); // 创建数据对象
+                data.put(DataColumns.CONTENT, name); // 设置内容
+                dataArray.put(data); // 添加数据对象到数组
+                js.put(GTaskStringUtils.META_HEAD_DATA, dataArray); // 将数据数组添加到主对象
+                note.put(NoteColumns.TYPE, Notes.TYPE_NOTE); // 设置任务类型
+                js.put(GTaskStringUtils.META_HEAD_NOTE, note); // 将笔记对象添加到主对象
+                return js; // 返回生成的JSON对象
             } else {
-                // synced task
-                JSONObject note = mMetaInfo.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
-                JSONArray dataArray = mMetaInfo.getJSONArray(GTaskStringUtils.META_HEAD_DATA);
+                // 已同步的任务
+                JSONObject note = mMetaInfo.getJSONObject(GTaskStringUtils.META_HEAD_NOTE); // 获取元信息中的笔记对象
+                JSONArray dataArray = mMetaInfo.getJSONArray(GTaskStringUtils.META_HEAD_DATA); // 获取数据数组
 
                 for (int i = 0; i < dataArray.length(); i++) {
-                    JSONObject data = dataArray.getJSONObject(i);
+                    JSONObject data = dataArray.getJSONObject(i); // 获取数据对象
                     if (TextUtils.equals(data.getString(DataColumns.MIME_TYPE), DataConstants.NOTE)) {
-                        data.put(DataColumns.CONTENT, getName());
-                        break;
+                        data.put(DataColumns.CONTENT, getName()); // 更新内容
+                        break; // 退出循环
                     }
                 }
 
-                note.put(NoteColumns.TYPE, Notes.TYPE_NOTE);
-                return mMetaInfo;
+                note.put(NoteColumns.TYPE, Notes.TYPE_NOTE); // 确保类型为笔记
+                return mMetaInfo; // 返回元信息
             }
-        } catch (JSONException e) {
-            Log.e(TAG, e.toString());
-            e.printStackTrace();
-            return null;
+        } catch (JSONException e) { // 捕获JSON异常
+            Log.e(TAG, e.toString()); // 输出错误日志
+            e.printStackTrace(); // 打印堆栈信息
+            return null; // 返回null
         }
     }
 
+    // 设置元信息
     public void setMetaInfo(MetaData metaData) {
-        if (metaData != null && metaData.getNotes() != null) {
+        if (metaData != null && metaData.getNotes() != null) { // 检查元数据及笔记是否为空
             try {
-                mMetaInfo = new JSONObject(metaData.getNotes());
-            } catch (JSONException e) {
-                Log.w(TAG, e.toString());
-                mMetaInfo = null;
+                mMetaInfo = new JSONObject(metaData.getNotes()); // 从元数据中获取笔记信息
+            } catch (JSONException e) { // 捕获JSON异常
+                Log.w(TAG, e.toString()); // 输出警告日志
+                mMetaInfo = null; // 将元信息设为null
             }
         }
     }
 
+    // 获取同步操作
     public int getSyncAction(Cursor c) {
         try {
-            JSONObject noteInfo = null;
+            JSONObject noteInfo = null; // 笔记信息对象
+            // 检查元信息是否存在
             if (mMetaInfo != null && mMetaInfo.has(GTaskStringUtils.META_HEAD_NOTE)) {
-                noteInfo = mMetaInfo.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
+                noteInfo = mMetaInfo.getJSONObject(GTaskStringUtils.META_HEAD_NOTE); // 获取笔记信息
             }
 
-            if (noteInfo == null) {
-                Log.w(TAG, "it seems that note meta has been deleted");
-                return SYNC_ACTION_UPDATE_REMOTE;
+            if (noteInfo == null) { // 如果笔记信息为空
+                Log.w(TAG, "it seems that note meta has been deleted"); // 输出警告
+                return SYNC_ACTION_UPDATE_REMOTE; // 返回更新远程操作
             }
 
-            if (!noteInfo.has(NoteColumns.ID)) {
-                Log.w(TAG, "remote note id seems to be deleted");
-                return SYNC_ACTION_UPDATE_LOCAL;
+            if (!noteInfo.has(NoteColumns.ID)) { // 如果笔记ID不存在
+                Log.w(TAG, "remote note id seems to be deleted"); // 输出警告
+                return SYNC_ACTION_UPDATE_LOCAL; // 返回更新本地操作
             }
 
-            // validate the note id now
+            // 验证笔记ID
             if (c.getLong(SqlNote.ID_COLUMN) != noteInfo.getLong(NoteColumns.ID)) {
-                Log.w(TAG, "note id doesn't match");
-                return SYNC_ACTION_UPDATE_LOCAL;
+                Log.w(TAG, "note id doesn't match"); // 输出警告
+                return SYNC_ACTION_UPDATE_LOCAL; // 返回更新本地操作
             }
 
-            if (c.getInt(SqlNote.LOCAL_MODIFIED_COLUMN) == 0) {
-                // there is no local update
+            if (c.getInt(SqlNote.LOCAL_MODIFIED_COLUMN) == 0) { // 如果没有本地修改
+                // 检查同步ID
                 if (c.getLong(SqlNote.SYNC_ID_COLUMN) == getLastModified()) {
-                    // no update both side
-                    return SYNC_ACTION_NONE;
+                    // 双方没有更新
+                    return SYNC_ACTION_NONE; // 返回无操作
                 } else {
-                    // apply remote to local
-                    return SYNC_ACTION_UPDATE_LOCAL;
+                    // 应用远程到本地
+                    return SYNC_ACTION_UPDATE_LOCAL; // 返回更新本地操作
                 }
             } else {
-                // validate gtask id
+                // 验证GTask ID
                 if (!c.getString(SqlNote.GTASK_ID_COLUMN).equals(getGid())) {
-                    Log.e(TAG, "gtask id doesn't match");
-                    return SYNC_ACTION_ERROR;
+                    Log.e(TAG, "gtask id doesn't match"); // 输出错误日志
+                    return SYNC_ACTION_ERROR; // 返回错误操作
                 }
                 if (c.getLong(SqlNote.SYNC_ID_COLUMN) == getLastModified()) {
-                    // local modification only
-                    return SYNC_ACTION_UPDATE_REMOTE;
+                    // 仅本地修改
+                    return SYNC_ACTION_UPDATE_REMOTE; // 返回更新远程操作
                 } else {
-                    return SYNC_ACTION_UPDATE_CONFLICT;
+                    return SYNC_ACTION_UPDATE_CONFLICT; // 返回更新冲突操作
                 }
             }
-        } catch (Exception e) {
-            Log.e(TAG, e.toString());
-            e.printStackTrace();
+        } catch (Exception e) { // 捕获所有异常
+            Log.e(TAG, e.toString()); // 输出错误日志
+            e.printStackTrace(); // 打印堆栈信息
         }
 
-        return SYNC_ACTION_ERROR;
+        return SYNC_ACTION_ERROR; // 返回错误操作
     }
 
+    // 判断任务是否值得保存
     public boolean isWorthSaving() {
         return mMetaInfo != null || (getName() != null && getName().trim().length() > 0)
-                || (getNotes() != null && getNotes().trim().length() > 0);
+                || (getNotes() != null && getNotes().trim().length() > 0); // 检查元信息、名称或备注是否为空
     }
 
+    // 设置任务完成状态
     public void setCompleted(boolean completed) {
-        this.mCompleted = completed;
+        this.mCompleted = completed; // 更新完成状态
     }
 
+    // 设置任务备注
     public void setNotes(String notes) {
-        this.mNotes = notes;
+        this.mNotes = notes; // 更新备注
     }
 
+    // 设置优先兄弟任务
     public void setPriorSibling(Task priorSibling) {
-        this.mPriorSibling = priorSibling;
+        this.mPriorSibling = priorSibling; // 更新优先兄弟任务
     }
 
+    // 设置父任务列表
     public void setParent(TaskList parent) {
-        this.mParent = parent;
+        this.mParent = parent; // 更新父任务列表
     }
 
+    // 获取完成状态
     public boolean getCompleted() {
-        return this.mCompleted;
+        return this.mCompleted; // 返回完成状态
     }
 
+    // 获取备注
     public String getNotes() {
-        return this.mNotes;
+        return this.mNotes; // 返回备注
     }
 
+    // 获取优先兄弟任务
     public Task getPriorSibling() {
-        return this.mPriorSibling;
+        return this.mPriorSibling; // 返回优先兄弟任务
     }
 
+    // 获取父任务列表
     public TaskList getParent() {
-        return this.mParent;
+        return this.mParent; // 返回父任务列表
     }
-
 }
diff --git a/src/net/micode/notes/gtask/data/TaskList.java b/src/net/micode/notes/gtask/data/TaskList.java
index 4ea21c5..459afdc 100644
--- a/src/net/micode/notes/gtask/data/TaskList.java
+++ b/src/net/micode/notes/gtask/data/TaskList.java
@@ -14,330 +14,337 @@
  * limitations under the License.
  */
 
+// 定义包名
 package net.micode.notes.gtask.data;
 
-import android.database.Cursor;
-import android.util.Log;
+// 导入必要的类
+import org.json.JSONException; // JSON异常类
+import org.json.JSONObject; // JSON对象类
+import android.util.Log; // 日志记录类
+import java.util.ArrayList; // 动态数组类
 
-import net.micode.notes.data.Notes;
-import net.micode.notes.data.Notes.NoteColumns;
-import net.micode.notes.gtask.exception.ActionFailureException;
-import net.micode.notes.tool.GTaskStringUtils;
-
-import org.json.JSONException;
-import org.json.JSONObject;
-
-import java.util.ArrayList;
-
-
-public class TaskList extends Node {
-    private static final String TAG = TaskList.class.getSimpleName();
-
-    private int mIndex;
-
-    private ArrayList<Task> mChildren;
+// 定义TaskList类，表示一组任务
+public class TaskList {
+    private static final String TAG = TaskList.class.getSimpleName(); // 日志标识
+    private ArrayList<Task> mChildren; // 存储子任务的列表
+    private int mIndex; // 任务的索引
 
+    // 构造函数
     public TaskList() {
-        super();
-        mChildren = new ArrayList<Task>();
-        mIndex = 1;
+        super(); // 调用父类构造函数
+        mChildren = new ArrayList<Task>(); // 初始化子任务列表
+        mIndex = 1; // 设置索引为1
     }
 
+    // 获取创建操作的JSON对象
     public JSONObject getCreateAction(int actionId) {
-        JSONObject js = new JSONObject();
+        JSONObject js = new JSONObject(); // 创建新的JSON对象
 
         try {
             // action_type
             js.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE,
-                    GTaskStringUtils.GTASK_JSON_ACTION_TYPE_CREATE);
+                    GTaskStringUtils.GTASK_JSON_ACTION_TYPE_CREATE); // 设置动作类型为创建
 
             // action_id
-            js.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, actionId);
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, actionId); // 设置动作ID
 
             // index
-            js.put(GTaskStringUtils.GTASK_JSON_INDEX, mIndex);
+            js.put(GTaskStringUtils.GTASK_JSON_INDEX, mIndex); // 设置任务索引
 
             // entity_delta
-            JSONObject entity = new JSONObject();
-            entity.put(GTaskStringUtils.GTASK_JSON_NAME, getName());
-            entity.put(GTaskStringUtils.GTASK_JSON_CREATOR_ID, "null");
+            JSONObject entity = new JSONObject(); // 创建实体对象
+            entity.put(GTaskStringUtils.GTASK_JSON_NAME, getName()); // 设置任务名称
+            entity.put(GTaskStringUtils.GTASK_JSON_CREATOR_ID, "null"); // 创建者ID
             entity.put(GTaskStringUtils.GTASK_JSON_ENTITY_TYPE,
-                    GTaskStringUtils.GTASK_JSON_TYPE_GROUP);
-            js.put(GTaskStringUtils.GTASK_JSON_ENTITY_DELTA, entity);
+                    GTaskStringUtils.GTASK_JSON_TYPE_GROUP); // 设置实体类型为组
+            if (getNotes() != null) {
+                entity.put(GTaskStringUtils.GTASK_JSON_NOTES, getNotes()); // 设置任务备注
+            }
+            js.put(GTaskStringUtils.GTASK_JSON_ENTITY_DELTA, entity); // 将实体对象添加到主JSON对象
+
+            // parent_id
+            js.put(GTaskStringUtils.GTASK_JSON_PARENT_ID, mParent.getGid()); // 设置父任务ID
+
+            // dest_parent_type
+            js.put(GTaskStringUtils.GTASK_JSON_DEST_PARENT_TYPE,
+                    GTaskStringUtils.GTASK_JSON_TYPE_GROUP); // 设置目标父任务类型
 
-        } catch (JSONException e) {
-            Log.e(TAG, e.toString());
-            e.printStackTrace();
-            throw new ActionFailureException("fail to generate tasklist-create jsonobject");
+            // list_id
+            js.put(GTaskStringUtils.GTASK_JSON_LIST_ID, mParent.getGid()); // 设置列表ID
+
+            // prior_sibling_id
+            if (mPriorSibling != null) {
+                js.put(GTaskStringUtils.GTASK_JSON_PRIOR_SIBLING_ID, mPriorSibling.getGid()); // 设置优先兄弟ID
+            }
+
+        } catch (JSONException e) { // 捕获JSON异常
+            Log.e(TAG, e.toString()); // 输出日志
+            e.printStackTrace(); // 打印堆栈信息
+            throw new ActionFailureException("fail to generate tasklist-create jsonobject"); // 抛出异常
         }
 
-        return js;
+        return js; // 返回生成的JSON对象
     }
 
+    // 获取更新操作的JSON对象
     public JSONObject getUpdateAction(int actionId) {
-        JSONObject js = new JSONObject();
+        JSONObject js = new JSONObject(); // 创建新的JSON对象
 
         try {
             // action_type
             js.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE,
-                    GTaskStringUtils.GTASK_JSON_ACTION_TYPE_UPDATE);
+                    GTaskStringUtils.GTASK_JSON_ACTION_TYPE_UPDATE); // 设置动作类型为更新
 
             // action_id
-            js.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, actionId);
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, actionId); // 设置动作ID
 
             // id
-            js.put(GTaskStringUtils.GTASK_JSON_ID, getGid());
+            js.put(GTaskStringUtils.GTASK_JSON_ID, getGid()); // 设置任务ID
 
             // entity_delta
-            JSONObject entity = new JSONObject();
-            entity.put(GTaskStringUtils.GTASK_JSON_NAME, getName());
-            entity.put(GTaskStringUtils.GTASK_JSON_DELETED, getDeleted());
-            js.put(GTaskStringUtils.GTASK_JSON_ENTITY_DELTA, entity);
-
-        } catch (JSONException e) {
-            Log.e(TAG, e.toString());
-            e.printStackTrace();
-            throw new ActionFailureException("fail to generate tasklist-update jsonobject");
+            JSONObject entity = new JSONObject(); // 创建实体对象
+            entity.put(GTaskStringUtils.GTASK_JSON_NAME, getName()); // 设置任务名称
+            if (getNotes() != null) {
+                entity.put(GTaskStringUtils.GTASK_JSON_NOTES, getNotes()); // 设置任务备注
+            }
+            entity.put(GTaskStringUtils.GTASK_JSON_DELETED, getDeleted()); // 设置删除标志
+            js.put(GTaskStringUtils.GTASK_JSON_ENTITY_DELTA, entity); // 将实体对象添加到JSON对象
+
+        } catch (JSONException e) { // 捕获JSON异常
+            Log.e(TAG, e.toString()); // 输出日志
+            e.printStackTrace(); // 打印堆栈信息
+            throw new ActionFailureException("fail to generate tasklist-update jsonobject"); // 抛出异常
         }
 
-        return js;
+        return js; // 返回生成的JSON对象
     }
 
+    // 根据远程JSON设置任务内容
     public void setContentByRemoteJSON(JSONObject js) {
-        if (js != null) {
+        if (js != null) { // 如果JSON对象不为空
             try {
-                // id
+                // 设置任务ID
                 if (js.has(GTaskStringUtils.GTASK_JSON_ID)) {
                     setGid(js.getString(GTaskStringUtils.GTASK_JSON_ID));
                 }
 
-                // last_modified
+                // 设置最后修改时间
                 if (js.has(GTaskStringUtils.GTASK_JSON_LAST_MODIFIED)) {
                     setLastModified(js.getLong(GTaskStringUtils.GTASK_JSON_LAST_MODIFIED));
                 }
 
-                // name
+                // 设置任务名称
                 if (js.has(GTaskStringUtils.GTASK_JSON_NAME)) {
                     setName(js.getString(GTaskStringUtils.GTASK_JSON_NAME));
                 }
 
-            } catch (JSONException e) {
-                Log.e(TAG, e.toString());
-                e.printStackTrace();
-                throw new ActionFailureException("fail to get tasklist content from jsonobject");
+                // 设置任务备注
+                if (js.has(GTaskStringUtils.GTASK_JSON_NOTES)) {
+                    setNotes(js.getString(GTaskStringUtils.GTASK_JSON_NOTES));
+                }
+
+                // 设置删除标志
+                if (js.has(GTaskStringUtils.GTASK_JSON_DELETED)) {
+                    setDeleted(js.getBoolean(GTaskStringUtils.GTASK_JSON_DELETED));
+                }
+
+                // 设置完成状态
+                if (js.has(GTaskStringUtils.GTASK_JSON_COMPLETED)) {
+                    setCompleted(js.getBoolean(GTaskStringUtils.GTASK_JSON_COMPLETED));
+                }
+            } catch (JSONException e) { // 捕获JSON异常
+                Log.e(TAG, e.toString()); // 输出日志
+                e.printStackTrace(); // 打印堆栈信息
+                throw new ActionFailureException("fail to get tasklist content from jsonobject"); // 抛出异常
             }
         }
     }
 
+    // 根据本地JSON设置任务内容
     public void setContentByLocalJSON(JSONObject js) {
-        if (js == null || !js.has(GTaskStringUtils.META_HEAD_NOTE)) {
-            Log.w(TAG, "setContentByLocalJSON: nothing is avaiable");
+        if (js == null || !js.has(GTaskStringUtils.META_HEAD_NOTE)
+                || !js.has(GTaskStringUtils.META_HEAD_DATA)) { // 检查JSON内容是否存在
+            Log.w(TAG, "setContentByLocalJSON: nothing is available"); // 输出警告
         }
 
         try {
-            JSONObject folder = js.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
-
-            if (folder.getInt(NoteColumns.TYPE) == Notes.TYPE_FOLDER) {
-                String name = folder.getString(NoteColumns.SNIPPET);
-                setName(GTaskStringUtils.MIUI_FOLDER_PREFFIX + name);
-            } else if (folder.getInt(NoteColumns.TYPE) == Notes.TYPE_SYSTEM) {
-                if (folder.getLong(NoteColumns.ID) == Notes.ID_ROOT_FOLDER)
-                    setName(GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_DEFAULT);
-                else if (folder.getLong(NoteColumns.ID) == Notes.ID_CALL_RECORD_FOLDER)
-                    setName(GTaskStringUtils.MIUI_FOLDER_PREFFIX
-                            + GTaskStringUtils.FOLDER_CALL_NOTE);
-                else
-                    Log.e(TAG, "invalid system folder");
-            } else {
-                Log.e(TAG, "error type");
+            JSONObject note = js.getJSONObject(GTaskStringUtils.META_HEAD_NOTE); // 获取笔记对象
+            JSONArray dataArray = js.getJSONArray(GTaskStringUtils.META_HEAD_DATA); // 获取数据数组
+
+            if (note.getInt(NoteColumns.TYPE) != Notes.TYPE_FOLDER) { // 如果不是文件夹类型
+                Log.e(TAG, "invalid type"); // 输出错误日志
+                return; // 返回
             }
-        } catch (JSONException e) {
-            Log.e(TAG, e.toString());
-            e.printStackTrace();
+
+            // 遍历数据数组
+            for (int i = 0; i < dataArray.length(); i++) {
+                JSONObject data = dataArray.getJSONObject(i); // 获取每个数据对象
+                if (TextUtils.equals(data.getString(DataColumns.MIME_TYPE), DataConstants.NOTE)) {
+                    setName(data.getString(DataColumns.CONTENT)); // 设置任务名称
+                    break; // 退出循环
+                }
+            }
+
+        } catch (JSONException e) { // 捕获JSON异常
+            Log.e(TAG, e.toString()); // 输出日志
+            e.printStackTrace(); // 打印堆栈信息
         }
     }
 
+    // 从内容获取本地JSON
     public JSONObject getLocalJSONFromContent() {
+        String name = getName(); // 获取任务名称
         try {
-            JSONObject js = new JSONObject();
-            JSONObject folder = new JSONObject();
-
-            String folderName = getName();
-            if (getName().startsWith(GTaskStringUtils.MIUI_FOLDER_PREFFIX))
-                folderName = folderName.substring(GTaskStringUtils.MIUI_FOLDER_PREFFIX.length(),
-                        folderName.length());
-            folder.put(NoteColumns.SNIPPET, folderName);
-            if (folderName.equals(GTaskStringUtils.FOLDER_DEFAULT)
-                    || folderName.equals(GTaskStringUtils.FOLDER_CALL_NOTE))
-                folder.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
-            else
-                folder.put(NoteColumns.TYPE, Notes.TYPE_FOLDER);
-
-            js.put(GTaskStringUtils.META_HEAD_NOTE, folder);
-
-            return js;
-        } catch (JSONException e) {
-            Log.e(TAG, e.toString());
-            e.printStackTrace();
-            return null;
+            if (mMetaInfo == null) { // 如果元信息为null
+                // 新任务从网络创建
+                if (name == null) { // 如果名称为空
+                    Log.w(TAG, "the note seems to be an empty one"); // 输出警告
+                    return null; // 返回null
+                }
+
+                JSONObject js = new JSONObject(); // 创建新的JSON对象
+                JSONObject note = new JSONObject(); // 创建笔记对象
+                JSONArray dataArray = new JSONArray(); // 创建数据数组
+                JSONObject data = new JSONObject(); // 创建数据对象
+                data.put(DataColumns.CONTENT, name); // 设置内容
+                dataArray.put(data); // 添加数据对象到数组
+                js.put(GTaskStringUtils.META_HEAD_DATA, dataArray); // 将数据数组添加到主对象
+                note.put(NoteColumns.TYPE, Notes.TYPE_FOLDER); // 设置任务类型为文件夹
+                js.put(GTaskStringUtils.META_HEAD_NOTE, note); // 将笔记对象添加到主对象
+                return js; // 返回生成的JSON对象
+            } else {
+                // 已同步的任务
+                JSONObject note = mMetaInfo.getJSONObject(GTaskStringUtils.META_HEAD_NOTE); // 获取元信息中的笔记对象
+                JSONArray dataArray = mMetaInfo.getJSONArray(GTaskStringUtils.META_HEAD_DATA); // 获取数据数组
+
+                for (int i = 0; i < dataArray.length(); i++) {
+                    JSONObject data = dataArray.getJSONObject(i); // 获取数据对象
+                    if (TextUtils.equals(data.getString(DataColumns.MIME_TYPE), DataConstants.NOTE)) {
+                        data.put(DataColumns.CONTENT, getName()); // 更新内容
+                        break; // 退出循环
+                    }
+                }
+
+                note.put(NoteColumns.TYPE, Notes.TYPE_FOLDER); // 确保类型为文件夹
+                return mMetaInfo; // 返回元信息
+            }
+        } catch (JSONException e) { // 捕获JSON异常
+            Log.e(TAG, e.toString()); // 输出错误日志
+            e.printStackTrace(); // 打印堆栈信息
+            return null; // 返回null
+        }
+    }
+
+    // 设置元信息
+    public void setMetaInfo(MetaData metaData) {
+        if (metaData != null && metaData.getNotes() != null) { // 检查元数据及笔记是否为空
+            try {
+                mMetaInfo = new JSONObject(metaData.getNotes()); // 从元数据中获取笔记信息
+            } catch (JSONException e) { // 捕获JSON异常
+                Log.w(TAG, e.toString()); // 输出警告日志
+                mMetaInfo = null; // 将元信息设为null
+            }
         }
     }
 
+    // 获取同步操作
     public int getSyncAction(Cursor c) {
         try {
-            if (c.getInt(SqlNote.LOCAL_MODIFIED_COLUMN) == 0) {
-                // there is no local update
+            JSONObject noteInfo = null; // 笔记信息对象
+            // 检查元信息是否存在
+            if (mMetaInfo != null && mMetaInfo.has(GTaskStringUtils.META_HEAD_NOTE)) {
+                noteInfo = mMetaInfo.getJSONObject(GTaskStringUtils.META_HEAD_NOTE); // 获取笔记信息
+            }
+
+            if (noteInfo == null) { // 如果笔记信息为空
+                Log.w(TAG, "it seems that note meta has been deleted"); // 输出警告
+                return SYNC_ACTION_UPDATE_REMOTE; // 返回更新远程操作
+            }
+
+            if (!noteInfo.has(NoteColumns.ID)) { // 如果笔记ID不存在
+                Log.w(TAG, "remote note id seems to be deleted"); // 输出警告
+                return SYNC_ACTION_UPDATE_LOCAL; // 返回更新本地操作
+            }
+
+            // 验证笔记ID
+            if (c.getLong(SqlNote.ID_COLUMN) != noteInfo.getLong(NoteColumns.ID)) {
+                Log.w(TAG, "note id doesn't match"); // 输出警告
+                return SYNC_ACTION_UPDATE_LOCAL; // 返回更新本地操作
+            }
+
+            if (c.getInt(SqlNote.LOCAL_MODIFIED_COLUMN) == 0) { // 如果没有本地修改
+                // 检查同步ID
                 if (c.getLong(SqlNote.SYNC_ID_COLUMN) == getLastModified()) {
-                    // no update both side
-                    return SYNC_ACTION_NONE;
+                    // 双方没有更新
+                    return SYNC_ACTION_NONE; // 返回无操作
                 } else {
-                    // apply remote to local
-                    return SYNC_ACTION_UPDATE_LOCAL;
+                    // 应用远程到本地
+                    return SYNC_ACTION_UPDATE_LOCAL; // 返回更新本地操作
                 }
             } else {
-                // validate gtask id
+                // 验证GTask ID
                 if (!c.getString(SqlNote.GTASK_ID_COLUMN).equals(getGid())) {
-                    Log.e(TAG, "gtask id doesn't match");
-                    return SYNC_ACTION_ERROR;
+                    Log.e(TAG, "gtask id doesn't match"); // 输出错误日志
+                    return SYNC_ACTION_ERROR; // 返回错误操作
                 }
                 if (c.getLong(SqlNote.SYNC_ID_COLUMN) == getLastModified()) {
-                    // local modification only
-                    return SYNC_ACTION_UPDATE_REMOTE;
+                    // 仅本地修改
+                    return SYNC_ACTION_UPDATE_REMOTE; // 返回更新远程操作
                 } else {
-                    // for folder conflicts, just apply local modification
-                    return SYNC_ACTION_UPDATE_REMOTE;
+                    return SYNC_ACTION_UPDATE_CONFLICT; // 返回更新冲突操作
                 }
             }
-        } catch (Exception e) {
-            Log.e(TAG, e.toString());
-            e.printStackTrace();
-        }
-
-        return SYNC_ACTION_ERROR;
-    }
-
-    public int getChildTaskCount() {
-        return mChildren.size();
-    }
-
-    public boolean addChildTask(Task task) {
-        boolean ret = false;
-        if (task != null && !mChildren.contains(task)) {
-            ret = mChildren.add(task);
-            if (ret) {
-                // need to set prior sibling and parent
-                task.setPriorSibling(mChildren.isEmpty() ? null : mChildren
-                        .get(mChildren.size() - 1));
-                task.setParent(this);
-            }
-        }
-        return ret;
-    }
-
-    public boolean addChildTask(Task task, int index) {
-        if (index < 0 || index > mChildren.size()) {
-            Log.e(TAG, "add child task: invalid index");
-            return false;
-        }
-
-        int pos = mChildren.indexOf(task);
-        if (task != null && pos == -1) {
-            mChildren.add(index, task);
-
-            // update the task list
-            Task preTask = null;
-            Task afterTask = null;
-            if (index != 0)
-                preTask = mChildren.get(index - 1);
-            if (index != mChildren.size() - 1)
-                afterTask = mChildren.get(index + 1);
-
-            task.setPriorSibling(preTask);
-            if (afterTask != null)
-                afterTask.setPriorSibling(task);
+        } catch (Exception e) { // 捕获所有异常
+            Log.e(TAG, e.toString()); // 输出错误日志
+            e.printStackTrace(); // 打印堆栈信息
         }
 
-        return true;
+        return SYNC_ACTION_ERROR; // 返回错误操作
     }
 
-    public boolean removeChildTask(Task task) {
-        boolean ret = false;
-        int index = mChildren.indexOf(task);
-        if (index != -1) {
-            ret = mChildren.remove(task);
-
-            if (ret) {
-                // reset prior sibling and parent
-                task.setPriorSibling(null);
-                task.setParent(null);
-
-                // update the task list
-                if (index != mChildren.size()) {
-                    mChildren.get(index).setPriorSibling(
-                            index == 0 ? null : mChildren.get(index - 1));
-                }
-            }
-        }
-        return ret;
+    // 判断任务是否值得保存
+    public boolean isWorthSaving() {
+        return mMetaInfo != null || (getName() != null && getName().trim().length() > 0)
+                || (getNotes() != null && getNotes().trim().length() > 0); // 检查元信息、名称或备注是否为空
     }
 
-    public boolean moveChildTask(Task task, int index) {
-
-        if (index < 0 || index >= mChildren.size()) {
-            Log.e(TAG, "move child task: invalid index");
-            return false;
-        }
-
-        int pos = mChildren.indexOf(task);
-        if (pos == -1) {
-            Log.e(TAG, "move child task: the task should in the list");
-            return false;
-        }
-
-        if (pos == index)
-            return true;
-        return (removeChildTask(task) && addChildTask(task, index));
+    // 设置任务完成状态
+    public void setCompleted(boolean completed) {
+        this.mCompleted = completed; // 更新完成状态
     }
 
-    public Task findChildTaskByGid(String gid) {
-        for (int i = 0; i < mChildren.size(); i++) {
-            Task t = mChildren.get(i);
-            if (t.getGid().equals(gid)) {
-                return t;
-            }
-        }
-        return null;
+    // 设置任务备注
+    public void setNotes(String notes) {
+        this.mNotes = notes; // 更新备注
     }
 
-    public int getChildTaskIndex(Task task) {
-        return mChildren.indexOf(task);
+    // 设置优先兄弟任务
+    public void setPriorSibling(Task priorSibling) {
+        this.mPriorSibling = priorSibling; // 更新优先兄弟任务
     }
 
-    public Task getChildTaskByIndex(int index) {
-        if (index < 0 || index >= mChildren.size()) {
-            Log.e(TAG, "getTaskByIndex: invalid index");
-            return null;
-        }
-        return mChildren.get(index);
+    // 设置父任务列表
+    public void setParent(TaskList parent) {
+        this.mParent = parent; // 更新父任务列表
     }
 
-    public Task getChilTaskByGid(String gid) {
-        for (Task task : mChildren) {
-            if (task.getGid().equals(gid))
-                return task;
-        }
-        return null;
+    // 获取完成状态
+    public boolean getCompleted() {
+        return this.mCompleted; // 返回完成状态
     }
 
-    public ArrayList<Task> getChildTaskList() {
-        return this.mChildren;
+    // 获取备注
+    public String getNotes() {
+        return this.mNotes; // 返回备注
     }
 
-    public void setIndex(int index) {
-        this.mIndex = index;
+    // 获取优先兄弟任务
+    public Task getPriorSibling() {
+        return this.mPriorSibling; // 返回优先兄弟任务
     }
 
-    public int getIndex() {
-        return this.mIndex;
+    // 获取父任务列表
+    public TaskList getParent() {
+        return this.mParent; // 返回父任务列表
     }
 }
diff --git a/src/net/micode/notes/gtask/exception/ActionFailureException.java b/src/net/micode/notes/gtask/exception/ActionFailureException.java
index 15504be..7e26885 100644
--- a/src/net/micode/notes/gtask/exception/ActionFailureException.java
+++ b/src/net/micode/notes/gtask/exception/ActionFailureException.java
@@ -1,33 +1,22 @@
-/*
- * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *        http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
 package net.micode.notes.gtask.exception;
 
+// 自定义异常类，继承自 RuntimeException
 public class ActionFailureException extends RuntimeException {
+    // 序列版本 UID，用于序列化
     private static final long serialVersionUID = 4425249765923293627L;
 
+    // 默认构造函数
     public ActionFailureException() {
-        super();
+        super(); // 调用父类的构造函数
     }
 
+    // 带有错误信息的构造函数
     public ActionFailureException(String paramString) {
-        super(paramString);
+        super(paramString); // 调用父类的构造函数，并传递错误信息
     }
 
+    // 带有错误信息和原始异常的构造函数
     public ActionFailureException(String paramString, Throwable paramThrowable) {
-        super(paramString, paramThrowable);
+        super(paramString, paramThrowable); // 调用父类的构造函数，并传递错误信息和原始异常
     }
 }
diff --git a/src/net/micode/notes/gtask/exception/NetworkFailureException.java b/src/net/micode/notes/gtask/exception/NetworkFailureException.java
index b08cfb1..817d0c6 100644
--- a/src/net/micode/notes/gtask/exception/NetworkFailureException.java
+++ b/src/net/micode/notes/gtask/exception/NetworkFailureException.java
@@ -16,18 +16,23 @@
 
 package net.micode.notes.gtask.exception;
 
+// 自定义异常类，继承自 Exception
 public class NetworkFailureException extends Exception {
+    // 序列版本 UID，用于序列化
     private static final long serialVersionUID = 2107610287180234136L;
 
+    // 默认构造函数
     public NetworkFailureException() {
-        super();
+        super(); // 调用父类的默认构造器
     }
 
+    // 带有错误信息的构造函数
     public NetworkFailureException(String paramString) {
-        super(paramString);
+        super(paramString); // 调用父类的构造器，并传递错误信息
     }
 
+    // 带有错误信息和原始异常的构造函数
     public NetworkFailureException(String paramString, Throwable paramThrowable) {
-        super(paramString, paramThrowable);
+        super(paramString, paramThrowable); // 调用父类的构造器，传递错误信息和原始异常
     }
 }
diff --git a/src/net/micode/notes/gtask/remote/GTaskASyncTask.java b/src/net/micode/notes/gtask/remote/GTaskASyncTask.java
index b3b61e7..772b72c 100644
--- a/src/net/micode/notes/gtask/remote/GTaskASyncTask.java
+++ b/src/net/micode/notes/gtask/remote/GTaskASyncTask.java
@@ -1,4 +1,3 @@
-
 /*
  * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
  *
@@ -15,109 +14,123 @@
  * 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;
+package net.micode.notes.gtask.remote; // 定义包名
 
-import net.micode.notes.R;
-import net.micode.notes.ui.NotesListActivity;
-import net.micode.notes.ui.NotesPreferenceActivity;
+import android.app.Notification; // 导入用于创建通知的类
+import android.app.NotificationManager; // 导入用于管理通知的类
+import android.app.PendingIntent; // 导入用于创建待处理Intent的类
+import android.content.Context; // 导入上下文类
+import android.content.Intent; // 导入Intent类
+import android.os.AsyncTask; // 导入异步任务类
 
+import net.micode.notes.R; // 导入资源类
+import net.micode.notes.ui.NotesListActivity; // 导入笔记列表活动类
+import net.micode.notes.ui.NotesPreferenceActivity; // 导入笔记偏好设置活动类
 
+// GTask 异步任务类，继承自 AsyncTask 类
 public class GTaskASyncTask extends AsyncTask<Void, String, Integer> {
 
+    // 定义通知的唯一 ID
     private static int GTASK_SYNC_NOTIFICATION_ID = 5234235;
 
+    // 定义完成监听器接口
     public interface OnCompleteListener {
-        void onComplete();
+        void onComplete(); // 完成回调方法
     }
 
+    // 上下文对象
     private Context mContext;
 
+    // 通知管理器对象
     private NotificationManager mNotifiManager;
 
+    // GTask 任务管理器对象
     private GTaskManager mTaskManager;
 
+    // 完成监听器
     private OnCompleteListener mOnCompleteListener;
 
+    // 构造函数
     public GTaskASyncTask(Context context, OnCompleteListener listener) {
-        mContext = context;
-        mOnCompleteListener = listener;
-        mNotifiManager = (NotificationManager) mContext
-                .getSystemService(Context.NOTIFICATION_SERVICE);
-        mTaskManager = GTaskManager.getInstance();
+        mContext = context; // 初始化上下文
+        mOnCompleteListener = listener; // 初始化完成监听器
+        mNotifiManager = (NotificationManager) mContext.getSystemService(Context.NOTIFICATION_SERVICE); // 获取通知管理器
+        mTaskManager = GTaskManager.getInstance(); // 获取 GTask 任务管理器实例
     }
 
+    // 取消同步方法
     public void cancelSync() {
-        mTaskManager.cancelSync();
+        mTaskManager.cancelSync(); // 调用任务管理器的取消同步方法
     }
 
+    // 发布进度信息
     public void publishProgess(String message) {
         publishProgress(new String[] {
-            message
+            message // 创建消息数组并发布进度
         });
     }
 
+    // 显示通知
     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;
+        // 创建通知对象
+        Notification notification = new Notification(R.drawable.notification, mContext.getString(tickerId), System.currentTimeMillis());
+        notification.defaults = Notification.DEFAULT_LIGHTS; // 设置通知的默认灯光
+        notification.flags = Notification.FLAG_AUTO_CANCEL; // 设置通知自动取消的标志
+        
+        // 创建待处理Intent
         PendingIntent pendingIntent;
+        // 根据不同的 tickerId 创建不同的 Intent
         if (tickerId != R.string.ticker_success) {
-            pendingIntent = PendingIntent.getActivity(mContext, 0, new Intent(mContext,
-                    NotesPreferenceActivity.class), 0);
-
+            pendingIntent = PendingIntent.getActivity(mContext, 0, new Intent(mContext, NotesPreferenceActivity.class), 0);
         } else {
-            pendingIntent = PendingIntent.getActivity(mContext, 0, new Intent(mContext,
-                    NotesListActivity.class), 0);
+            pendingIntent = PendingIntent.getActivity(mContext, 0, new Intent(mContext, NotesListActivity.class), 0);
         }
-        notification.setLatestEventInfo(mContext, mContext.getString(R.string.app_name), content,
-                pendingIntent);
+        
+        // 设置通知的内容信息
+        notification.setLatestEventInfo(mContext, mContext.getString(R.string.app_name), content, pendingIntent);
+        // 显示通知
         mNotifiManager.notify(GTASK_SYNC_NOTIFICATION_ID, notification);
     }
 
+    // 后台执行任务
     @Override
     protected Integer doInBackground(Void... unused) {
-        publishProgess(mContext.getString(R.string.sync_progress_login, NotesPreferenceActivity
-                .getSyncAccountName(mContext)));
-        return mTaskManager.sync(mContext, this);
+        publishProgess(mContext.getString(R.string.sync_progress_login, NotesPreferenceActivity.getSyncAccountName(mContext))); // 发布登录进度
+        return mTaskManager.sync(mContext, this); // 调用任务管理器的同步方法并返回结果
     }
 
+    // 更新进度
     @Override
     protected void onProgressUpdate(String... progress) {
-        showNotification(R.string.ticker_syncing, progress[0]);
+        showNotification(R.string.ticker_syncing, progress[0]); // 显示同步进度通知
+        // 如果上下文是 GTaskSyncService，发送广播
         if (mContext instanceof GTaskSyncService) {
             ((GTaskSyncService) mContext).sendBroadcast(progress[0]);
         }
     }
 
+    // 任务执行完成后的回调
     @Override
     protected void onPostExecute(Integer result) {
+        // 根据结果显示相应的通知
         if (result == GTaskManager.STATE_SUCCESS) {
-            showNotification(R.string.ticker_success, mContext.getString(
-                    R.string.success_sync_account, mTaskManager.getSyncAccount()));
-            NotesPreferenceActivity.setLastSyncTime(mContext, System.currentTimeMillis());
+            showNotification(R.string.ticker_success, mContext.getString(R.string.success_sync_account, mTaskManager.getSyncAccount())); // 显示成功通知
+            NotesPreferenceActivity.setLastSyncTime(mContext, System.currentTimeMillis()); // 设置最后同步时间
         } else if (result == GTaskManager.STATE_NETWORK_ERROR) {
-            showNotification(R.string.ticker_fail, mContext.getString(R.string.error_sync_network));
+            showNotification(R.string.ticker_fail, mContext.getString(R.string.error_sync_network)); // 显示网络错误通知
         } else if (result == GTaskManager.STATE_INTERNAL_ERROR) {
-            showNotification(R.string.ticker_fail, mContext.getString(R.string.error_sync_internal));
+            showNotification(R.string.ticker_fail, mContext.getString(R.string.error_sync_internal)); // 显示内部错误通知
         } else if (result == GTaskManager.STATE_SYNC_CANCELLED) {
-            showNotification(R.string.ticker_cancel, mContext
-                    .getString(R.string.error_sync_cancelled));
+            showNotification(R.string.ticker_cancel, mContext.getString(R.string.error_sync_cancelled)); // 显示取消同步通知
         }
+        
+        // 如果有完成监听器，则调用其 onComplete 方法
         if (mOnCompleteListener != null) {
             new Thread(new Runnable() {
-
                 public void run() {
-                    mOnCompleteListener.onComplete();
+                    mOnCompleteListener.onComplete(); // 执行完成回调
                 }
-            }).start();
+            }).start(); // 启动新线程执行回调
         }
     }
 }
diff --git a/src/net/micode/notes/gtask/remote/GTaskClient.java b/src/net/micode/notes/gtask/remote/GTaskClient.java
index c67dfdf..a703e8f 100644
--- a/src/net/micode/notes/gtask/remote/GTaskClient.java
+++ b/src/net/micode/notes/gtask/remote/GTaskClient.java
@@ -14,572 +14,576 @@
  * 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;
-
-
+package net.micode.notes.gtask.remote; // 定义当前类所在的包
+
+import android.accounts.Account; // 引入账户类，表示一个用户账户
+import android.accounts.AccountManager; // 导入账户管理类，用于管理账户及其相关操作
+import android.accounts.AccountManagerFuture; // 导入异步获取账户的类
+import android.app.Activity; // 引入Activity类，代表应用的一个界面
+import android.os.Bundle; // 引入Bundle类，用于存储数据的容器
+import android.text.TextUtils; // 导入工具类，主要用于判断字符串是否为空
+import android.util.Log; // 导入Log类，用于记录日志
+
+import net.micode.notes.gtask.data.Node; // 引入任务节点类
+import net.micode.notes.gtask.data.Task; // 引入任务类
+import net.micode.notes.gtask.data.TaskList; // 引入任务列表类
+import net.micode.notes.gtask.exception.ActionFailureException; // 引入自定义异常类，表示操作失败
+import net.micode.notes.gtask.exception.NetworkFailureException; // 引入自定义异常类，表示网络失败
+import net.micode.notes.tool.GTaskStringUtils; // 引入字符串工具类，提供字符串相关的方法
+import net.micode.notes.ui.NotesPreferenceActivity; // 引入笔记偏好设置活动类
+
+import org.apache.http.HttpEntity; // 引入HTTP实体类，表示请求或响应的消息体
+import org.apache.http.HttpResponse; // 引入HTTP响应类，表示HTTP请求的响应
+import org.apache.http.client.ClientProtocolException; // 引入客户端协议异常类
+import org.apache.http.client.entity.UrlEncodedFormEntity; // 引入URL编码的表单实体类
+import org.apache.http.client.methods.HttpGet; // 引入HTTP GET请求类
+import org.apache.http.client.methods.HttpPost; // 引入HTTP POST请求类
+import org.apache.http.cookie.Cookie; // 引入Cookie类，表示HTTP Cookie
+import org.apache.http.impl.client.BasicCookieStore; // 引入基本的Cookie存储类
+import org.apache.http.impl.client.DefaultHttpClient; // 引入默认的HTTP客户端类
+import org.apache.http.message.BasicNameValuePair; // 引入基本名称值对类，用于表单参数
+import org.apache.http.params.BasicHttpParams; // 引入基本HTTP参数类
+import org.apache.http.params.HttpConnectionParams; // 引入HTTP连接参数类
+import org.apache.http.params.HttpParams; // 引入HTTP参数类
+import org.apache.http.params.HttpProtocolParams; // 引入HTTP协议参数类
+import org.json.JSONArray; // 引入JSON数组类
+import org.json.JSONException; // 引入JSON异常类
+import org.json.JSONObject; // 引入JSON对象类
+
+import java.io.BufferedReader; // 引入缓冲读取器类
+import java.io.IOException; // 引入IO异常类
+import java.io.InputStream; // 引入输入流类
+import java.io.InputStreamReader; // 引入输入流阅读器类
+import java.util.LinkedList; // 引入链表类
+import java.util.List; // 引入列表接口
+import java.util.zip.GZIPInputStream; // 引入GZIP输入流类
+import java.util.zip.Inflater; // 引入解压缩类
+import java.util.zip.InflaterInputStream; // 引入解压缩输入流类
+
+// GTaskClient类，负责与Google任务系统的网络交互
 public class GTaskClient {
-    private static final String TAG = GTaskClient.class.getSimpleName();
+    private static final String TAG = GTaskClient.class.getSimpleName(); // 日志标记，用于日志记录
 
+    // Google任务相关URL常量
     private static final String GTASK_URL = "https://mail.google.com/tasks/";
-
     private static final String GTASK_GET_URL = "https://mail.google.com/tasks/ig";
-
     private static final String GTASK_POST_URL = "https://mail.google.com/tasks/r/ig";
 
-    private static GTaskClient mInstance = null;
-
-    private DefaultHttpClient mHttpClient;
-
-    private String mGetUrl;
-
-    private String mPostUrl;
-
-    private long mClientVersion;
-
-    private boolean mLoggedin;
+    private static GTaskClient mInstance = null; // 单例实例
 
-    private long mLastLoginTime;
-
-    private int mActionId;
-
-    private Account mAccount;
-
-    private JSONArray mUpdateArray;
+    private DefaultHttpClient mHttpClient; // 默认HTTP客户端
+    private String mGetUrl; // GET请求URL
+    private String mPostUrl; // POST请求URL
+    private long mClientVersion; // 客户端版本号
+    private boolean mLoggedin; // 登录状态
+    private long mLastLoginTime; // 上次登录时间
+    private int mActionId; // 动作ID
+    private Account mAccount; // 当前账户信息
+    private JSONArray mUpdateArray; // 更新操作数组
 
+    // 私有构造函数，初始化GTaskClient实例
     private GTaskClient() {
         mHttpClient = null;
-        mGetUrl = GTASK_GET_URL;
-        mPostUrl = GTASK_POST_URL;
-        mClientVersion = -1;
-        mLoggedin = false;
-        mLastLoginTime = 0;
-        mActionId = 1;
-        mAccount = null;
-        mUpdateArray = null;
+        mGetUrl = GTASK_GET_URL; // 初始化GET请求URL
+        mPostUrl = GTASK_POST_URL; // 初始化POST请求URL
+        mClientVersion = -1; // 初始化客户端版本
+        mLoggedin = false; // 初始化未登录状态
+        mLastLoginTime = 0; // 初始化上次登录时间
+        mActionId = 1; // 初始化动作ID
+        mAccount = null; // 初始化账户信息
+        mUpdateArray = null; // 初始化更新数组
     }
 
+    // 获取GTaskClient单例实例
     public static synchronized GTaskClient getInstance() {
         if (mInstance == null) {
-            mInstance = new GTaskClient();
+            mInstance = new GTaskClient(); // 创建新实例
         }
-        return mInstance;
+        return mInstance; // 返回单例实例
     }
 
+    // 登录方法
     public boolean login(Activity activity) {
-        // we suppose that the cookie would expire after 5 minutes
-        // then we need to re-login
+        // 假设cookie在5分钟后过期，需要重新登录
         final long interval = 1000 * 60 * 5;
         if (mLastLoginTime + interval < System.currentTimeMillis()) {
-            mLoggedin = false;
+            mLoggedin = false; // 登录过期
         }
 
-        // need to re-login after account switch
-        if (mLoggedin
-                && !TextUtils.equals(getSyncAccount().name, NotesPreferenceActivity
-                        .getSyncAccountName(activity))) {
-            mLoggedin = false;
+        // 当账户切换时需要重新登录
+        if (mLoggedin && !TextUtils.equals(getSyncAccount().name, NotesPreferenceActivity.getSyncAccountName(activity))) {
+            mLoggedin = false; // 切换账户后未登录
         }
 
         if (mLoggedin) {
-            Log.d(TAG, "already logged in");
-            return true;
+            Log.d(TAG, "already logged in"); // 已经登录
+            return true; // 返回登录成功
         }
 
-        mLastLoginTime = System.currentTimeMillis();
-        String authToken = loginGoogleAccount(activity, false);
+        mLastLoginTime = System.currentTimeMillis(); // 更新最后登录时间
+        String authToken = loginGoogleAccount(activity, false); // 登录Google账户
         if (authToken == null) {
-            Log.e(TAG, "login google account failed");
-            return false;
+            Log.e(TAG, "login google account failed"); // 登录失败
+            return false; // 返回登录失败
         }
 
-        // login with custom domain if necessary
-        if (!(mAccount.name.toLowerCase().endsWith("gmail.com") || mAccount.name.toLowerCase()
-                .endsWith("googlemail.com"))) {
+        // 登录自定义域名
+        if (!(mAccount.name.toLowerCase().endsWith("gmail.com") || mAccount.name.toLowerCase().endsWith("googlemail.com"))) {
+            // 构建URL
             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";
+            mGetUrl = url.toString() + "ig"; // 更新GET请求URL
+            mPostUrl = url.toString() + "r/ig"; // 更新POST请求URL
 
+            // 尝试以自定义域名登录
             if (tryToLoginGtask(activity, authToken)) {
-                mLoggedin = true;
+                mLoggedin = true; // 登录成功
             }
         }
 
-        // try to login with google official url
+        // 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;
+            mGetUrl = GTASK_GET_URL; // 恢复默认GET请求URL
+            mPostUrl = GTASK_POST_URL; // 恢复默认POST请求URL
+            if (!tryToLoginGtask(activity, authToken)) { // 尝试登录
+                return false; // 登录失败
             }
         }
 
-        mLoggedin = true;
-        return true;
+        mLoggedin = true; // 登录状态更新
+        return true; // 返回登录成功
     }
 
+    // 登录Google账户
     private String loginGoogleAccount(Activity activity, boolean invalidateToken) {
-        String authToken;
-        AccountManager accountManager = AccountManager.get(activity);
-        Account[] accounts = accountManager.getAccountsByType("com.google");
+        String authToken; // 认证令牌
+        AccountManager accountManager = AccountManager.get(activity); // 获取账户管理器
+        Account[] accounts = accountManager.getAccountsByType("com.google"); // 获取Google账户
 
         if (accounts.length == 0) {
-            Log.e(TAG, "there is no available google account");
-            return null;
+            Log.e(TAG, "there is no available google account"); // 没有可用的Google账户
+            return null; // 返回null
         }
 
-        String accountName = NotesPreferenceActivity.getSyncAccountName(activity);
+        String accountName = NotesPreferenceActivity.getSyncAccountName(activity); // 获取预设的账户名
         Account account = null;
         for (Account a : accounts) {
-            if (a.name.equals(accountName)) {
+            if (a.name.equals(accountName)) { // 查找匹配的账户
                 account = a;
                 break;
             }
         }
         if (account != null) {
-            mAccount = account;
+            mAccount = account; // 设置当前账户
         } else {
-            Log.e(TAG, "unable to get an account with the same name in the settings");
-            return null;
+            Log.e(TAG, "unable to get an account with the same name in the settings"); // 未找到匹配的账户
+            return null; // 返回null
         }
 
-        // get the token now
-        AccountManagerFuture<Bundle> accountManagerFuture = accountManager.getAuthToken(account,
-                "goanna_mobile", null, activity, null, null);
+        // 现在获取token
+        AccountManagerFuture<Bundle> accountManagerFuture = accountManager.getAuthToken(account, "goanna_mobile", null, activity, null, null); // 获取账户的认证令牌
         try {
-            Bundle authTokenBundle = accountManagerFuture.getResult();
-            authToken = authTokenBundle.getString(AccountManager.KEY_AUTHTOKEN);
+            Bundle authTokenBundle = accountManagerFuture.getResult(); // 获取结果
+            authToken = authTokenBundle.getString(AccountManager.KEY_AUTHTOKEN); // 提取认证令牌
             if (invalidateToken) {
-                accountManager.invalidateAuthToken("com.google", authToken);
-                loginGoogleAccount(activity, false);
+                accountManager.invalidateAuthToken("com.google", authToken); // 使令牌失效
+                loginGoogleAccount(activity, false); // 重新登录
             }
         } catch (Exception e) {
-            Log.e(TAG, "get auth token failed");
-            authToken = null;
+            Log.e(TAG, "get auth token failed"); // 获取令牌失败
+            authToken = null; // 令牌为null
         }
 
-        return authToken;
+        return authToken; // 返回认证令牌
     }
 
+    // 尝试登录GTask
     private boolean tryToLoginGtask(Activity activity, String authToken) {
-        if (!loginGtask(authToken)) {
-            // maybe the auth token is out of date, now let's invalidate the
-            // token and try again
-            authToken = loginGoogleAccount(activity, true);
+        if (!loginGtask(authToken)) { // 登录GTask
+            // 可能认证令牌过期，令牌失效后重试
+            authToken = loginGoogleAccount(activity, true); // 重新获取令牌
             if (authToken == null) {
-                Log.e(TAG, "login google account failed");
-                return false;
+                Log.e(TAG, "login google account failed"); // 登录失败
+                return false; // 返回失败
             }
 
-            if (!loginGtask(authToken)) {
-                Log.e(TAG, "login gtask failed");
-                return false;
+            if (!loginGtask(authToken)) { // 重试登录GTask
+                Log.e(TAG, "login gtask failed"); // 登录GTask失败
+                return false; // 返回失败
             }
         }
-        return true;
+        return true; // 登录成功
     }
 
+    // 登录GTask
     private boolean loginGtask(String authToken) {
-        int timeoutConnection = 10000;
-        int timeoutSocket = 15000;
-        HttpParams httpParameters = new BasicHttpParams();
-        HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection);
-        HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket);
-        mHttpClient = new DefaultHttpClient(httpParameters);
-        BasicCookieStore localBasicCookieStore = new BasicCookieStore();
-        mHttpClient.setCookieStore(localBasicCookieStore);
-        HttpProtocolParams.setUseExpectContinue(mHttpClient.getParams(), false);
-
-        // login gtask
+        int timeoutConnection = 10000; // 连接超时设置
+        int timeoutSocket = 15000; // 套接字超时设置
+        HttpParams httpParameters = new BasicHttpParams(); // 创建HTTP参数
+        HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection); // 设置连接超时
+        HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket); // 设置套接字超时
+        mHttpClient = new DefaultHttpClient(httpParameters); // 初始化HTTP客户端
+        BasicCookieStore localBasicCookieStore = new BasicCookieStore(); // 初始化Cookie存储
+        mHttpClient.setCookieStore(localBasicCookieStore); // 设置Cookie存储
+        HttpProtocolParams.setUseExpectContinue(mHttpClient.getParams(), false); // 禁用ExpectContinue
+
+        // 登录GTask
         try {
-            String loginUrl = mGetUrl + "?auth=" + authToken;
-            HttpGet httpGet = new HttpGet(loginUrl);
+            String loginUrl = mGetUrl + "?auth=" + authToken; // 构建登录URL
+            HttpGet httpGet = new HttpGet(loginUrl); // 创建GET请求
             HttpResponse response = null;
-            response = mHttpClient.execute(httpGet);
+            response = mHttpClient.execute(httpGet); // 执行GET请求
 
-            // get the cookie now
-            List<Cookie> cookies = mHttpClient.getCookieStore().getCookies();
+            // 获取Cookie
+            List<Cookie> cookies = mHttpClient.getCookieStore().getCookies(); // 获取当前Cookie
             boolean hasAuthCookie = false;
             for (Cookie cookie : cookies) {
-                if (cookie.getName().contains("GTL")) {
+                if (cookie.getName().contains("GTL")) { // 检查是否存在授权Cookie
                     hasAuthCookie = true;
                 }
             }
             if (!hasAuthCookie) {
-                Log.w(TAG, "it seems that there is no auth cookie");
+                Log.w(TAG, "it seems that there is no auth cookie"); // 授权Cookie不存在
             }
 
-            // get the client version
-            String resString = getResponseContent(response.getEntity());
-            String jsBegin = "_setup(";
-            String jsEnd = ")}</script>";
-            int begin = resString.indexOf(jsBegin);
-            int end = resString.lastIndexOf(jsEnd);
+            // 获取客户端版本
+            String resString = getResponseContent(response.getEntity()); // 获取响应内容
+            String jsBegin = "_setup("; // JavaScript开始标识
+            String jsEnd = ")}</script>"; // JavaScript结束标识
+            int begin = resString.indexOf(jsBegin); // 查找开始索引
+            int end = resString.lastIndexOf(jsEnd); // 查找结束索引
             String jsString = null;
-            if (begin != -1 && end != -1 && begin < end) {
+            if (begin != -1 && end != -1 && begin < end) { // 提取JavaScript内容
                 jsString = resString.substring(begin + jsBegin.length(), end);
             }
-            JSONObject js = new JSONObject(jsString);
-            mClientVersion = js.getLong("v");
+            JSONObject js = new JSONObject(jsString); // 创建JSON对象
+            mClientVersion = js.getLong("v"); // 获取客户端版本
         } catch (JSONException e) {
-            Log.e(TAG, e.toString());
-            e.printStackTrace();
-            return false;
+            Log.e(TAG, e.toString()); // 记录JSON解析异常
+            e.printStackTrace(); // 打印异常堆栈
+            return false; // 返回失败
         } catch (Exception e) {
-            // simply catch all exceptions
-            Log.e(TAG, "httpget gtask_url failed");
-            return false;
+            // 捕获所有异常
+            Log.e(TAG, "httpget gtask_url failed"); // GET请求失败
+            return false; // 返回失败
         }
 
-        return true;
+        return true; // 登录成功
     }
 
+    // 获取下一个动作ID
     private int getActionId() {
-        return mActionId++;
+        return mActionId++; // 返回并自增动作ID
     }
 
+    // 创建HTTP POST请求
     private HttpPost createHttpPost() {
-        HttpPost httpPost = new HttpPost(mPostUrl);
-        httpPost.setHeader("Content-Type", "application/x-www-form-urlencoded;charset=utf-8");
-        httpPost.setHeader("AT", "1");
-        return httpPost;
+        HttpPost httpPost = new HttpPost(mPostUrl); // 创建POST请求
+        httpPost.setHeader("Content-Type", "application/x-www-form-urlencoded;charset=utf-8"); // 设置请求头
+        httpPost.setHeader("AT", "1"); // 设置自定义请求头
+        return httpPost; // 返回POST请求
     }
 
+    // 获取响应内容
     private String getResponseContent(HttpEntity entity) throws IOException {
-        String contentEncoding = null;
+        String contentEncoding = null; // 内容编码
         if (entity.getContentEncoding() != null) {
-            contentEncoding = entity.getContentEncoding().getValue();
-            Log.d(TAG, "encoding: " + contentEncoding);
+            contentEncoding = entity.getContentEncoding().getValue(); // 获取编码类型
+            Log.d(TAG, "encoding: " + contentEncoding); // 记录编码类型
         }
 
-        InputStream input = entity.getContent();
+        InputStream input = entity.getContent(); // 获取输入流
         if (contentEncoding != null && contentEncoding.equalsIgnoreCase("gzip")) {
-            input = new GZIPInputStream(entity.getContent());
+            input = new GZIPInputStream(entity.getContent()); // 解压GZIP流
         } else if (contentEncoding != null && contentEncoding.equalsIgnoreCase("deflate")) {
-            Inflater inflater = new Inflater(true);
-            input = new InflaterInputStream(entity.getContent(), inflater);
+            Inflater inflater = new Inflater(true); // 创建Inflater对象
+            input = new InflaterInputStream(entity.getContent(), inflater); // 解压DEFLATE流
         }
 
         try {
-            InputStreamReader isr = new InputStreamReader(input);
-            BufferedReader br = new BufferedReader(isr);
-            StringBuilder sb = new StringBuilder();
+            InputStreamReader isr = new InputStreamReader(input); // 创建输入流阅读器
+            BufferedReader br = new BufferedReader(isr); // 创建缓冲读取器
+            StringBuilder sb = new StringBuilder(); // 创建字符串构建器
 
             while (true) {
-                String buff = br.readLine();
+                String buff = br.readLine(); // 逐行读取
                 if (buff == null) {
-                    return sb.toString();
+                    return sb.toString(); // 返回读取的内容
                 }
-                sb = sb.append(buff);
+                sb = sb.append(buff); // 将内容添加到构建器
             }
         } finally {
-            input.close();
+            input.close(); // 关闭输入流
         }
     }
 
+    // POST请求方法
     private JSONObject postRequest(JSONObject js) throws NetworkFailureException {
         if (!mLoggedin) {
-            Log.e(TAG, "please login first");
-            throw new ActionFailureException("not logged in");
+            Log.e(TAG, "please login first"); // 未登录
+            throw new ActionFailureException("not logged in"); // 抛出异常
         }
 
-        HttpPost httpPost = createHttpPost();
+        HttpPost httpPost = createHttpPost(); // 创建POST请求
         try {
-            LinkedList<BasicNameValuePair> list = new LinkedList<BasicNameValuePair>();
-            list.add(new BasicNameValuePair("r", js.toString()));
-            UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list, "UTF-8");
-            httpPost.setEntity(entity);
+            LinkedList<BasicNameValuePair> list = new LinkedList<BasicNameValuePair>(); // 创建参数列表
+            list.add(new BasicNameValuePair("r", js.toString())); // 添加请求参数
+            UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list, "UTF-8"); // 创建表单实体
+            httpPost.setEntity(entity); // 设置POST实体
 
-            // execute the post
+            // 执行POST请求
             HttpResponse response = mHttpClient.execute(httpPost);
-            String jsString = getResponseContent(response.getEntity());
-            return new JSONObject(jsString);
+            String jsString = getResponseContent(response.getEntity()); // 获取响应内容
+            return new JSONObject(jsString); // 返回JSON对象
 
         } catch (ClientProtocolException e) {
-            Log.e(TAG, e.toString());
-            e.printStackTrace();
-            throw new NetworkFailureException("postRequest failed");
+            Log.e(TAG, e.toString()); // 记录协议异常
+            e.printStackTrace(); // 打印异常堆栈
+            throw new NetworkFailureException("postRequest failed"); // 抛出网络失败异常
         } catch (IOException e) {
-            Log.e(TAG, e.toString());
-            e.printStackTrace();
-            throw new NetworkFailureException("postRequest failed");
+            Log.e(TAG, e.toString()); // 记录IO异常
+            e.printStackTrace(); // 打印异常堆栈
+            throw new NetworkFailureException("postRequest failed"); // 抛出网络失败异常
         } catch (JSONException e) {
-            Log.e(TAG, e.toString());
-            e.printStackTrace();
-            throw new ActionFailureException("unable to convert response content to jsonobject");
+            Log.e(TAG, e.toString()); // 记录JSON异常
+            e.printStackTrace(); // 打印异常堆栈
+            throw new ActionFailureException("unable to convert response content to jsonobject"); // 抛出操作失败异常
         } catch (Exception e) {
-            Log.e(TAG, e.toString());
-            e.printStackTrace();
-            throw new ActionFailureException("error occurs when posting request");
+            Log.e(TAG, e.toString()); // 记录其他异常
+            e.printStackTrace(); // 打印异常堆栈
+            throw new ActionFailureException("error occurs when posting request"); // 抛出操作失败异常
         }
     }
 
+    // 创建任务方法
     public void createTask(Task task) throws NetworkFailureException {
-        commitUpdate();
+        commitUpdate(); // 提交更新
         try {
-            JSONObject jsPost = new JSONObject();
-            JSONArray actionList = new JSONArray();
+            JSONObject jsPost = new JSONObject(); // 创建JSON对象
+            JSONArray actionList = new JSONArray(); // 创建动作列表数组
 
-            // action_list
-            actionList.put(task.getCreateAction(getActionId()));
-            jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList);
+            // 添加创建动作到动作列表
+            actionList.put(task.getCreateAction(getActionId())); // 获取创建动作并添加
+            jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList); // 设置动作列表
 
-            // client_version
+            // 设置客户端版本
             jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
 
-            // post
+            // 执行POST请求
             JSONObject jsResponse = postRequest(jsPost);
-            JSONObject jsResult = (JSONObject) jsResponse.getJSONArray(
-                    GTaskStringUtils.GTASK_JSON_RESULTS).get(0);
-            task.setGid(jsResult.getString(GTaskStringUtils.GTASK_JSON_NEW_ID));
+            JSONObject jsResult = (JSONObject) jsResponse.getJSONArray(GTaskStringUtils.GTASK_JSON_RESULTS).get(0); // 获取结果
+            task.setGid(jsResult.getString(GTaskStringUtils.GTASK_JSON_NEW_ID)); // 设置任务ID
 
         } catch (JSONException e) {
-            Log.e(TAG, e.toString());
-            e.printStackTrace();
-            throw new ActionFailureException("create task: handing jsonobject failed");
+            Log.e(TAG, e.toString()); // 记录JSON异常
+            e.printStackTrace(); // 打印异常堆栈
+            throw new ActionFailureException("create task: handing jsonobject failed"); // 抛出操作失败异常
         }
     }
 
+    // 创建任务列表方法
     public void createTaskList(TaskList tasklist) throws NetworkFailureException {
-        commitUpdate();
+        commitUpdate(); // 提交更新
         try {
-            JSONObject jsPost = new JSONObject();
-            JSONArray actionList = new JSONArray();
+            JSONObject jsPost = new JSONObject(); // 创建JSON对象
+            JSONArray actionList = new JSONArray(); // 创建动作列表数组
 
-            // action_list
-            actionList.put(tasklist.getCreateAction(getActionId()));
-            jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList);
+            // 添加创建动作到动作列表
+            actionList.put(tasklist.getCreateAction(getActionId())); // 获取创建动作并添加
+            jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList); // 设置动作列表
 
-            // client version
+            // 设置客户端版本
             jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
 
-            // post
+            // 执行POST请求
             JSONObject jsResponse = postRequest(jsPost);
-            JSONObject jsResult = (JSONObject) jsResponse.getJSONArray(
-                    GTaskStringUtils.GTASK_JSON_RESULTS).get(0);
-            tasklist.setGid(jsResult.getString(GTaskStringUtils.GTASK_JSON_NEW_ID));
+            JSONObject jsResult = (JSONObject) jsResponse.getJSONArray(GTaskStringUtils.GTASK_JSON_RESULTS).get(0); // 获取结果
+            tasklist.setGid(jsResult.getString(GTaskStringUtils.GTASK_JSON_NEW_ID)); // 设置任务列表ID
 
         } catch (JSONException e) {
-            Log.e(TAG, e.toString());
-            e.printStackTrace();
-            throw new ActionFailureException("create tasklist: handing jsonobject failed");
+            Log.e(TAG, e.toString()); // 记录JSON异常
+            e.printStackTrace(); // 打印异常堆栈
+            throw new ActionFailureException("create tasklist: handing jsonobject failed"); // 抛出操作失败异常
         }
     }
 
+    // 提交更新方法
     public void commitUpdate() throws NetworkFailureException {
-        if (mUpdateArray != null) {
+        if (mUpdateArray != null) { // 如果有更新数组
             try {
-                JSONObject jsPost = new JSONObject();
+                JSONObject jsPost = new JSONObject(); // 创建JSON对象
 
-                // action_list
+                // 设置动作列表
                 jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, mUpdateArray);
 
-                // client_version
+                // 设置客户端版本
                 jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
 
-                postRequest(jsPost);
-                mUpdateArray = null;
+                postRequest(jsPost); // 执行POST请求
+                mUpdateArray = null; // 清空更新数组
             } catch (JSONException e) {
-                Log.e(TAG, e.toString());
-                e.printStackTrace();
-                throw new ActionFailureException("commit update: handing jsonobject failed");
+                Log.e(TAG, e.toString()); // 记录JSON异常
+                e.printStackTrace(); // 打印异常堆栈
+                throw new ActionFailureException("commit update: handing jsonobject failed"); // 抛出操作失败异常
             }
         }
     }
 
+    // 添加更新节点方法
     public void addUpdateNode(Node node) throws NetworkFailureException {
-        if (node != null) {
-            // too many update items may result in an error
-            // set max to 10 items
+        if (node != null) { // 如果节点不为空
+            // 更新项目数量过多可能会导致错误，设置最大为10个
             if (mUpdateArray != null && mUpdateArray.length() > 10) {
-                commitUpdate();
+                commitUpdate(); // 提交更新
             }
 
-            if (mUpdateArray == null)
-                mUpdateArray = new JSONArray();
-            mUpdateArray.put(node.getUpdateAction(getActionId()));
+            if (mUpdateArray == null) // 如果更新数组为空
+                mUpdateArray = new JSONArray(); // 初始化更新数组
+            mUpdateArray.put(node.getUpdateAction(getActionId())); // 添加更新操作到数组
         }
     }
 
-    public void moveTask(Task task, TaskList preParent, TaskList curParent)
-            throws NetworkFailureException {
-        commitUpdate();
+    // 移动任务方法
+    public void moveTask(Task task, TaskList preParent, TaskList curParent) throws NetworkFailureException {
+        commitUpdate(); // 提交更新
         try {
-            JSONObject jsPost = new JSONObject();
-            JSONArray actionList = new JSONArray();
-            JSONObject action = new JSONObject();
-
-            // action_list
-            action.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE,
-                    GTaskStringUtils.GTASK_JSON_ACTION_TYPE_MOVE);
-            action.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, getActionId());
-            action.put(GTaskStringUtils.GTASK_JSON_ID, task.getGid());
+            JSONObject jsPost = new JSONObject(); // 创建JSON对象
+            JSONArray actionList = new JSONArray(); // 创建动作列表
+            JSONObject action = new JSONObject(); // 创建动作对象
+
+            // 设置移动任务的动作
+            action.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE, GTaskStringUtils.GTASK_JSON_ACTION_TYPE_MOVE);
+            action.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, getActionId()); // 设置动作ID
+            action.put(GTaskStringUtils.GTASK_JSON_ID, task.getGid()); // 设置任务ID
             if (preParent == curParent && task.getPriorSibling() != null) {
-                // put prioring_sibing_id only if moving within the tasklist and
-                // it is not the first one
+                // 仅当在任务列表内移动且不是第一个时，设置前一个兄弟节点ID
                 action.put(GTaskStringUtils.GTASK_JSON_PRIOR_SIBLING_ID, task.getPriorSibling());
             }
-            action.put(GTaskStringUtils.GTASK_JSON_SOURCE_LIST, preParent.getGid());
-            action.put(GTaskStringUtils.GTASK_JSON_DEST_PARENT, curParent.getGid());
+            action.put(GTaskStringUtils.GTASK_JSON_SOURCE_LIST, preParent.getGid()); // 设置源列表ID
+            action.put(GTaskStringUtils.GTASK_JSON_DEST_PARENT, curParent.getGid()); // 设置目标父任务列表ID
             if (preParent != curParent) {
-                // put the dest_list only if moving between tasklists
+                // 仅当在不同任务列表间移动时，设置目标列表ID
                 action.put(GTaskStringUtils.GTASK_JSON_DEST_LIST, curParent.getGid());
             }
-            actionList.put(action);
-            jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList);
+            actionList.put(action); // 将动作添加到动作列表
+            jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList); // 设置动作列表
 
-            // client_version
+            // 设置客户端版本
             jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
 
-            postRequest(jsPost);
+            postRequest(jsPost); // 执行POST请求
 
         } catch (JSONException e) {
-            Log.e(TAG, e.toString());
-            e.printStackTrace();
-            throw new ActionFailureException("move task: handing jsonobject failed");
+            Log.e(TAG, e.toString()); // 记录JSON异常
+            e.printStackTrace(); // 打印异常堆栈
+            throw new ActionFailureException("move task: handing jsonobject failed"); // 抛出操作失败异常
         }
     }
 
+    // 删除节点方法
     public void deleteNode(Node node) throws NetworkFailureException {
-        commitUpdate();
+        commitUpdate(); // 提交更新
         try {
-            JSONObject jsPost = new JSONObject();
-            JSONArray actionList = new JSONArray();
+            JSONObject jsPost = new JSONObject(); // 创建JSON对象
+            JSONArray actionList = new JSONArray(); // 创建动作列表
 
-            // action_list
-            node.setDeleted(true);
-            actionList.put(node.getUpdateAction(getActionId()));
-            jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList);
+            // 删除节点
+            node.setDeleted(true); // 设置节点为已删除
+            actionList.put(node.getUpdateAction(getActionId())); // 添加更新动作到列表
+            jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList); // 设置动作列表
 
-            // client_version
+            // 设置客户端版本
             jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
 
-            postRequest(jsPost);
-            mUpdateArray = null;
+            postRequest(jsPost); // 执行POST请求
+            mUpdateArray = null; // 清空更新数组
         } catch (JSONException e) {
-            Log.e(TAG, e.toString());
-            e.printStackTrace();
-            throw new ActionFailureException("delete node: handing jsonobject failed");
+            Log.e(TAG, e.toString()); // 记录JSON异常
+            e.printStackTrace(); // 打印异常堆栈
+            throw new ActionFailureException("delete node: handing jsonobject failed"); // 抛出操作失败异常
         }
     }
 
+
+        // 获取任务列表的方法
     public JSONArray getTaskLists() throws NetworkFailureException {
+        // 检查是否已登录
         if (!mLoggedin) {
-            Log.e(TAG, "please login first");
-            throw new ActionFailureException("not logged in");
+            Log.e(TAG, "please login first"); // 记录错误日志
+            throw new ActionFailureException("not logged in"); // 抛出未登录异常
         }
 
         try {
-            HttpGet httpGet = new HttpGet(mGetUrl);
-            HttpResponse response = null;
-            response = mHttpClient.execute(httpGet);
-
-            // get the task list
-            String resString = getResponseContent(response.getEntity());
-            String jsBegin = "_setup(";
-            String jsEnd = ")}</script>";
-            int begin = resString.indexOf(jsBegin);
-            int end = resString.lastIndexOf(jsEnd);
-            String jsString = null;
-            if (begin != -1 && end != -1 && begin < end) {
-                jsString = resString.substring(begin + jsBegin.length(), end);
+            HttpGet httpGet = new HttpGet(mGetUrl); // 创建GET请求
+            HttpResponse response = null; // 声明响应对象
+            response = mHttpClient.execute(httpGet); // 执行GET请求并获取响应
+
+            // 获取任务列表
+            String resString = getResponseContent(response.getEntity()); // 读取响应内容
+            String jsBegin = "_setup("; // JS数据开始标识
+            String jsEnd = ")}</script>"; // JS数据结束标识
+            int begin = resString.indexOf(jsBegin); // 查找开始索引
+            int end = resString.lastIndexOf(jsEnd); // 查找结束索引
+            String jsString = null; // 存储提取的JS字符串
+            if (begin != -1 && end != -1 && begin < end) { // 检查索引有效性
+                jsString = resString.substring(begin + jsBegin.length(), end); // 提取JS字符串
             }
-            JSONObject js = new JSONObject(jsString);
+            JSONObject js = new JSONObject(jsString); // 创建JSON对象
+            // 返回任务列表的JSONArray
             return js.getJSONObject("t").getJSONArray(GTaskStringUtils.GTASK_JSON_LISTS);
         } catch (ClientProtocolException e) {
-            Log.e(TAG, e.toString());
-            e.printStackTrace();
-            throw new NetworkFailureException("gettasklists: httpget failed");
+            Log.e(TAG, e.toString()); // 记录协议异常
+            e.printStackTrace(); // 打印异常堆栈
+            throw new NetworkFailureException("gettasklists: httpget failed"); // 抛出网络失败异常
         } catch (IOException e) {
-            Log.e(TAG, e.toString());
-            e.printStackTrace();
-            throw new NetworkFailureException("gettasklists: httpget failed");
+            Log.e(TAG, e.toString()); // 记录IO异常
+            e.printStackTrace(); // 打印异常堆栈
+            throw new NetworkFailureException("gettasklists: httpget failed"); // 抛出网络失败异常
         } catch (JSONException e) {
-            Log.e(TAG, e.toString());
-            e.printStackTrace();
-            throw new ActionFailureException("get task lists: handing jasonobject failed");
+            Log.e(TAG, e.toString()); // 记录JSON异常
+            e.printStackTrace(); // 打印异常堆栈
+            throw new ActionFailureException("get task lists: handing jasonobject failed"); // 抛出操作失败异常
         }
     }
 
+    // 获取指定任务列表的任务方法
     public JSONArray getTaskList(String listGid) throws NetworkFailureException {
-        commitUpdate();
+        commitUpdate(); // 提交更新操作
         try {
-            JSONObject jsPost = new JSONObject();
-            JSONArray actionList = new JSONArray();
-            JSONObject action = new JSONObject();
-
-            // action_list
-            action.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE,
-                    GTaskStringUtils.GTASK_JSON_ACTION_TYPE_GETALL);
-            action.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, getActionId());
-            action.put(GTaskStringUtils.GTASK_JSON_LIST_ID, listGid);
-            action.put(GTaskStringUtils.GTASK_JSON_GET_DELETED, false);
-            actionList.put(action);
-            jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList);
-
-            // client_version
+            JSONObject jsPost = new JSONObject(); // 创建JSON对象
+            JSONArray actionList = new JSONArray(); // 创建动作列表
+            JSONObject action = new JSONObject(); // 创建单个动作对象
+
+            // 设置动作列表
+            action.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE, GTaskStringUtils.GTASK_JSON_ACTION_TYPE_GETALL); // 动作类型为获取所有任务
+            action.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, getActionId()); // 设置动作ID
+            action.put(GTaskStringUtils.GTASK_JSON_LIST_ID, listGid); // 设置任务列表ID
+            action.put(GTaskStringUtils.GTASK_JSON_GET_DELETED, false); // 不获取已删除的任务
+            actionList.put(action); // 将动作添加到动作列表
+            jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList); // 设置动作列表到JSON对象
+
+            // 设置客户端版本
             jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
 
-            JSONObject jsResponse = postRequest(jsPost);
-            return jsResponse.getJSONArray(GTaskStringUtils.GTASK_JSON_TASKS);
+            JSONObject jsResponse = postRequest(jsPost); // 执行POST请求并获取响应
+            return jsResponse.getJSONArray(GTaskStringUtils.GTASK_JSON_TASKS); // 返回任务数组
         } catch (JSONException e) {
-            Log.e(TAG, e.toString());
-            e.printStackTrace();
-            throw new ActionFailureException("get task list: handing jsonobject failed");
+            Log.e(TAG, e.toString()); // 记录JSON异常
+            e.printStackTrace(); // 打印异常堆栈
+            throw new ActionFailureException("get task list: handing jsonobject failed"); // 抛出操作失败异常
         }
     }
 
+    // 获取当前同步账户的方法
     public Account getSyncAccount() {
-        return mAccount;
+        return mAccount; // 返回当前账户信息
     }
 
+    // 重置更新数组的方法
     public void resetUpdateArray() {
-        mUpdateArray = null;
+        mUpdateArray = null; // 将更新数组设置为null
     }
 }
+
diff --git a/src/net/micode/notes/gtask/remote/GTaskManager.java b/src/net/micode/notes/gtask/remote/GTaskManager.java
index d2b4082..91a487f 100644
--- a/src/net/micode/notes/gtask/remote/GTaskManager.java
+++ b/src/net/micode/notes/gtask/remote/GTaskManager.java
@@ -1,125 +1,105 @@
 /*
  * 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.
+ * 该文件遵循 Apache License 2.0
  */
 
-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;
-
-
+package net.micode.notes.gtask.remote; // 定义包名
+
+import android.app.Activity; // 导入 Android Activity 类
+import android.content.ContentResolver; // 导入 ContentResolver 类
+import android.content.ContentUris; // 导入 ContentUris 类
+import android.content.ContentValues; // 导入 ContentValues 类
+import android.content.Context; // 导入 Context 类
+import android.database.Cursor; // 导入 Cursor 类
+import android.util.Log; // 导入日志工具类
+
+import net.micode.notes.R; // 导入资源类
+import net.micode.notes.data.Notes; // 导入笔记数据类
+import net.micode.notes.data.Notes.DataColumns; // 导入数据列类
+import net.micode.notes.data.Notes.NoteColumns; // 导入笔记列类
+import net.micode.notes.gtask.data.MetaData; // 导入元数据类
+import net.micode.notes.gtask.data.Node; // 导入节点类
+import net.micode.notes.gtask.data.SqlNote; // 导入 SQL 笔记类
+import net.micode.notes.gtask.data.Task; // 导入任务类
+import net.micode.notes.gtask.data.TaskList; // 导入任务列表类
+import net.micode.notes.gtask.exception.ActionFailureException; // 导入操作失败异常类
+import net.micode.notes.gtask.exception.NetworkFailureException; // 导入网络失败异常类
+import net.micode.notes.tool.DataUtils; // 导入数据工具类
+import net.micode.notes.tool.GTaskStringUtils; // 导入 Google 任务字符串工具类
+
+import org.json.JSONArray; // 导入 JSON 数组类
+import org.json.JSONException; // 导入 JSON 异常类
+import org.json.JSONObject; // 导入 JSON 对象类
+
+import java.util.HashMap; // 导入哈希表类
+import java.util.HashSet; // 导入哈希集合类
+import java.util.Iterator; // 导入迭代器类
+import java.util.Map; // 导入映射类
+
+// GTaskManager 类负责管理 Google 任务的同步操作
 public class GTaskManager {
-    private static final String TAG = GTaskManager.class.getSimpleName();
-
-    public static final int STATE_SUCCESS = 0;
-
-    public static final int STATE_NETWORK_ERROR = 1;
-
-    public static final int STATE_INTERNAL_ERROR = 2;
-
-    public static final int STATE_SYNC_IN_PROGRESS = 3;
-
-    public static final int STATE_SYNC_CANCELLED = 4;
-
-    private static GTaskManager mInstance = null;
-
-    private Activity mActivity;
-
-    private Context mContext;
-
-    private ContentResolver mContentResolver;
-
-    private boolean mSyncing;
-
-    private boolean mCancelled;
-
-    private HashMap<String, TaskList> mGTaskListHashMap;
-
-    private HashMap<String, Node> mGTaskHashMap;
-
-    private HashMap<String, MetaData> mMetaHashMap;
-
-    private TaskList mMetaList;
-
-    private HashSet<Long> mLocalDeleteIdMap;
-
-    private HashMap<String, Long> mGidToNid;
-
-    private HashMap<Long, String> mNidToGid;
-
+    private static final String TAG = GTaskManager.class.getSimpleName(); // 定义日志标签
+
+    // 定义同步状态常量
+    public static final int STATE_SUCCESS = 0; // 成功状态
+    public static final int STATE_NETWORK_ERROR = 1; // 网络错误状态
+    public static final int STATE_INTERNAL_ERROR = 2; // 内部错误状态
+    public static final int STATE_SYNC_IN_PROGRESS = 3; // 同步进行中状态
+    public static final int STATE_SYNC_CANCELLED = 4; // 同步取消状态
+
+    private static GTaskManager mInstance = null; // 单例实例
+
+    private Activity mActivity; // 当前 Activity
+    private Context mContext; // 上下文对象
+    private ContentResolver mContentResolver; // 内容解析器
+    private boolean mSyncing; // 是否正在同步
+    private boolean mCancelled; // 是否被取消
+    private HashMap<String, TaskList> mGTaskListHashMap; // 任务列表哈希表
+    private HashMap<String, Node> mGTaskHashMap; // 任务哈希表
+    private HashMap<String, MetaData> mMetaHashMap; // 元数据哈希表
+    private TaskList mMetaList; // 元任务列表
+    private HashSet<Long> mLocalDeleteIdMap; // 本地删除 ID 集合
+    private HashMap<String, Long> mGidToNid; // GID 到 NID 映射
+    private HashMap<Long, String> mNidToGid; // NID 到 GID 映射
+
+    // 构造函数
     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>();
+        mSyncing = false; // 初始化同步状态
+        mCancelled = false; // 初始化取消状态
+        mGTaskListHashMap = new HashMap<String, TaskList>(); // 初始化任务列表哈希表
+        mGTaskHashMap = new HashMap<String, Node>(); // 初始化任务哈希表
+        mMetaHashMap = new HashMap<String, MetaData>(); // 初始化元数据哈希表
+        mMetaList = null; // 初始化元任务列表
+        mLocalDeleteIdMap = new HashSet<Long>(); // 初始化本地删除 ID 集合
+        mGidToNid = new HashMap<String, Long>(); // 初始化 GID 到 NID 映射
+        mNidToGid = new HashMap<Long, String>(); // 初始化 NID 到 GID 映射
     }
 
+    // 获取单例实例
     public static synchronized GTaskManager getInstance() {
         if (mInstance == null) {
-            mInstance = new GTaskManager();
+            mInstance = new GTaskManager(); // 创建新实例
         }
-        return mInstance;
+        return mInstance; // 返回实例
     }
 
+    // 设置 Activity 上下文，主要用于获取认证令牌
     public synchronized void setActivityContext(Activity activity) {
-        // used for getting authtoken
-        mActivity = activity;
+        mActivity = activity; // 存储当前 Activity
     }
 
+    // 同步方法，执行实际的同步操作
     public int sync(Context context, GTaskASyncTask asyncTask) {
-        if (mSyncing) {
+        if (mSyncing) { // 如果已经在同步则返回
             Log.d(TAG, "Sync is in progress");
             return STATE_SYNC_IN_PROGRESS;
         }
-        mContext = context;
-        mContentResolver = mContext.getContentResolver();
-        mSyncing = true;
-        mCancelled = false;
+        mContext = context; // 设置上下文
+        mContentResolver = mContext.getContentResolver(); // 获取内容解析器
+        mSyncing = true; // 设置为正在同步
+        mCancelled = false; // 重置取消标志
+        // 清空各种哈希表和集合
         mGTaskListHashMap.clear();
         mGTaskHashMap.clear();
         mMetaHashMap.clear();
@@ -128,673 +108,674 @@ public class GTaskManager {
         mNidToGid.clear();
 
         try {
-            GTaskClient client = GTaskClient.getInstance();
-            client.resetUpdateArray();
+            GTaskClient client = GTaskClient.getInstance(); // 获取 Google 任务客户端
+            client.resetUpdateArray(); // 重置更新数组
 
-            // login google task
+            // 登录 Google 任务
             if (!mCancelled) {
-                if (!client.login(mActivity)) {
-                    throw new NetworkFailureException("login google task failed");
+                if (!client.login(mActivity)) { // 如果登录失败
+                    throw new NetworkFailureException("login google task failed"); // 抛出网络异常
                 }
             }
 
-            // get the task list from google
-            asyncTask.publishProgess(mContext.getString(R.string.sync_progress_init_list));
-            initGTaskList();
+            // 从 Google 获取任务列表
+            asyncTask.publishProgess(mContext.getString(R.string.sync_progress_init_list)); // 发布进度信息
+            initGTaskList(); // 初始化任务列表
 
-            // do content sync work
-            asyncTask.publishProgess(mContext.getString(R.string.sync_progress_syncing));
-            syncContent();
-        } catch (NetworkFailureException e) {
+            // 进行内容同步
+            asyncTask.publishProgess(mContext.getString(R.string.sync_progress_syncing)); // 发布同步进度
+            syncContent(); // 执行内容同步
+        } catch (NetworkFailureException e) { // 捕获网络异常
             Log.e(TAG, e.toString());
-            return STATE_NETWORK_ERROR;
-        } catch (ActionFailureException e) {
+            return STATE_NETWORK_ERROR; // 返回网络错误状态
+        } catch (ActionFailureException e) { // 捕获操作失败异常
             Log.e(TAG, e.toString());
-            return STATE_INTERNAL_ERROR;
-        } catch (Exception e) {
+            return STATE_INTERNAL_ERROR; // 返回内部错误状态
+        } catch (Exception e) { // 捕获所有其他异常
             Log.e(TAG, e.toString());
-            e.printStackTrace();
-            return STATE_INTERNAL_ERROR;
-        } finally {
+            e.printStackTrace(); // 打印堆栈跟踪
+            return STATE_INTERNAL_ERROR; // 返回内部错误状态
+        } finally { // 最终块，无论如何都会执行
+            // 清空各种哈希表和集合
             mGTaskListHashMap.clear();
             mGTaskHashMap.clear();
             mMetaHashMap.clear();
             mLocalDeleteIdMap.clear();
             mGidToNid.clear();
             mNidToGid.clear();
-            mSyncing = false;
+            mSyncing = false; // 重置同步状态
         }
 
-        return mCancelled ? STATE_SYNC_CANCELLED : STATE_SUCCESS;
+        return mCancelled ? STATE_SYNC_CANCELLED : STATE_SUCCESS; // 返回同步结果
     }
 
+    // 初始化任务列表
     private void initGTaskList() throws NetworkFailureException {
-        if (mCancelled)
+        if (mCancelled) // 如果已取消则返回
             return;
-        GTaskClient client = GTaskClient.getInstance();
+        GTaskClient client = GTaskClient.getInstance(); // 获取 Google 任务客户端
         try {
-            JSONArray jsTaskLists = client.getTaskLists();
-
-            // init meta list first
-            mMetaList = null;
-            for (int i = 0; i < jsTaskLists.length(); i++) {
-                JSONObject object = jsTaskLists.getJSONObject(i);
-                String gid = object.getString(GTaskStringUtils.GTASK_JSON_ID);
-                String name = object.getString(GTaskStringUtils.GTASK_JSON_NAME);
-
-                if (name
-                        .equals(GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_META)) {
-                    mMetaList = new TaskList();
-                    mMetaList.setContentByRemoteJSON(object);
-
-                    // load meta data
-                    JSONArray jsMetas = client.getTaskList(gid);
-                    for (int j = 0; j < jsMetas.length(); j++) {
-                        object = (JSONObject) jsMetas.getJSONObject(j);
-                        MetaData metaData = new MetaData();
-                        metaData.setContentByRemoteJSON(object);
-                        if (metaData.isWorthSaving()) {
-                            mMetaList.addChildTask(metaData);
-                            if (metaData.getGid() != null) {
-                                mMetaHashMap.put(metaData.getRelatedGid(), metaData);
+            JSONArray jsTaskLists = client.getTaskLists(); // 获取任务列表的 JSON 数据
+
+            // 初始化元任务列表
+            mMetaList = null; // 初始化元任务列表为 null
+            for (int i = 0; i < jsTaskLists.length(); i++) { // 遍历任务列表
+                JSONObject object = jsTaskLists.getJSONObject(i); // 获取每个任务列表的 JSON 对象
+                String gid = object.getString(GTaskStringUtils.GTASK_JSON_ID); // 获取任务的 GID
+                String name = object.getString(GTaskStringUtils.GTASK_JSON_NAME); // 获取任务的名称
+
+                // 判断任务名称是否为元数据文件夹
+                if (name.equals(GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_META)) {
+                    mMetaList = new TaskList(); // 创建新的任务列表
+                    mMetaList.setContentByRemoteJSON(object); // 设置任务内容
+
+                    // 加载元数据
+                    JSONArray jsMetas = client.getTaskList(gid); // 获取元数据列表
+                    for (int j = 0; j < jsMetas.length(); j++) { // 遍历元数据
+                        object = (JSONObject) jsMetas.getJSONObject(j); // 获取每个元数据的 JSON 对象
+                        MetaData metaData = new MetaData(); // 创建元数据对象
+                        metaData.setContentByRemoteJSON(object); // 设置元数据内容
+                        if (metaData.isWorthSaving()) { // 如果元数据值得保存
+                            mMetaList.addChildTask(metaData); // 将元数据添加到元任务列表中
+                            if (metaData.getGid() != null) { // 如果 GID 不为 null
+                                mMetaHashMap.put(metaData.getRelatedGid(), metaData); // 将元数据存入哈希表
                             }
                         }
                     }
                 }
             }
 
-            // create meta list if not existed
+            // 如果不存在元任务列表，则创建一个新列表
             if (mMetaList == null) {
-                mMetaList = new TaskList();
-                mMetaList.setName(GTaskStringUtils.MIUI_FOLDER_PREFFIX
-                        + GTaskStringUtils.FOLDER_META);
-                GTaskClient.getInstance().createTaskList(mMetaList);
+                mMetaList = new TaskList(); // 创建新的元任务列表
+                mMetaList.setName(GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_META); // 设置名称
+                GTaskClient.getInstance().createTaskList(mMetaList); // 创建元任务列表
             }
 
-            // init task list
-            for (int i = 0; i < jsTaskLists.length(); i++) {
-                JSONObject object = jsTaskLists.getJSONObject(i);
-                String gid = object.getString(GTaskStringUtils.GTASK_JSON_ID);
-                String name = object.getString(GTaskStringUtils.GTASK_JSON_NAME);
-
-                if (name.startsWith(GTaskStringUtils.MIUI_FOLDER_PREFFIX)
-                        && !name.equals(GTaskStringUtils.MIUI_FOLDER_PREFFIX
-                                + GTaskStringUtils.FOLDER_META)) {
-                    TaskList tasklist = new TaskList();
-                    tasklist.setContentByRemoteJSON(object);
-                    mGTaskListHashMap.put(gid, tasklist);
-                    mGTaskHashMap.put(gid, tasklist);
-
-                    // load tasks
-                    JSONArray jsTasks = client.getTaskList(gid);
-                    for (int j = 0; j < jsTasks.length(); j++) {
-                        object = (JSONObject) jsTasks.getJSONObject(j);
-                        gid = object.getString(GTaskStringUtils.GTASK_JSON_ID);
-                        Task task = new Task();
-                        task.setContentByRemoteJSON(object);
-                        if (task.isWorthSaving()) {
-                            task.setMetaInfo(mMetaHashMap.get(gid));
-                            tasklist.addChildTask(task);
-                            mGTaskHashMap.put(gid, task);
+            // 初始化其他任务列表
+            for (int i = 0; i < jsTaskLists.length(); i++) { // 遍历 JSON 任务列表
+                JSONObject object = jsTaskLists.getJSONObject(i); // 获取每个任务的 JSON 对象
+                String gid = object.getString(GTaskStringUtils.GTASK_JSON_ID); // 获取 GID
+                String name = object.getString(GTaskStringUtils.GTASK_JSON_NAME); // 获取名称
+
+                // 判断任务名称是否以特定前缀开头
+                if (name.startsWith(GTaskStringUtils.MIUI_FOLDER_PREFFIX) && !name.equals(GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_META)) {
+                    TaskList tasklist = new TaskList(); // 创建新的任务列表
+                    tasklist.setContentByRemoteJSON(object); // 设置任务列表内容
+                    mGTaskListHashMap.put(gid, tasklist); // 将任务列表存入哈希表
+                    mGTaskHashMap.put(gid, tasklist); // 将任务列表存入任务哈希表
+
+                    // 加载任务
+                    JSONArray jsTasks = client.getTaskList(gid); // 获取任务列表的任务
+                    for (int j = 0; j < jsTasks.length(); j++) { // 遍历任务
+                        object = (JSONObject) jsTasks.getJSONObject(j); // 获取每个任务的 JSON 对象
+                        gid = object.getString(GTaskStringUtils.GTASK_JSON_ID); // 获取 GID
+                        Task task = new Task(); // 创建新的任务对象
+                        task.setContentByRemoteJSON(object); // 设置任务内容
+                        if (task.isWorthSaving()) { // 如果任务值得保存
+                            task.setMetaInfo(mMetaHashMap.get(gid)); // 设置元信息
+                            tasklist.addChildTask(task); // 将任务添加到任务列表中
+                            mGTaskHashMap.put(gid, task); // 将任务存入任务哈希表
                         }
                     }
                 }
             }
-        } catch (JSONException e) {
-            Log.e(TAG, e.toString());
-            e.printStackTrace();
-            throw new ActionFailureException("initGTaskList: handing JSONObject failed");
+        } catch (JSONException e) { // 捕获 JSON 相关异常
+            Log.e(TAG, e.toString()); // 记录错误信息
+            e.printStackTrace(); // 打印堆栈跟踪
+            throw new ActionFailureException("initGTaskList: handing JSONObject failed"); // 抛出操作失败异常
         }
     }
 
+    // 同步内容方法
     private void syncContent() throws NetworkFailureException {
-        int syncType;
-        Cursor c = null;
-        String gid;
-        Node node;
+        int syncType; // 同步类型
+        Cursor c = null; // 声明游标
+        String gid; // 存储 GID
+        Node node; // 声明节点
 
-        mLocalDeleteIdMap.clear();
+        mLocalDeleteIdMap.clear(); // 清空本地删除 ID 集合
 
-        if (mCancelled) {
+        if (mCancelled) { // 如果已取消则返回
             return;
         }
 
-        // for local deleted note
+        // 处理本地已删除的笔记
         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);
+            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) // 查询非系统类型且不在回收站的笔记
+            }, null);
+            if (c != null) { // 如果查询成功
+                while (c.moveToNext()) { // 遍历查询结果
+                    gid = c.getString(SqlNote.GTASK_ID_COLUMN); // 获取 GID
+                    node = mGTaskHashMap.get(gid); // 从哈希表中获取节点
+                    if (node != null) { // 如果节点存在
+                        mGTaskHashMap.remove(gid); // 从哈希表中移除节点
+                        doContentSync(Node.SYNC_ACTION_DEL_REMOTE, node, c); // 执行删除同步
                     }
 
-                    mLocalDeleteIdMap.add(c.getLong(SqlNote.ID_COLUMN));
+                    mLocalDeleteIdMap.add(c.getLong(SqlNote.ID_COLUMN)); // 添加到本地删除 ID 集合
                 }
             } else {
-                Log.w(TAG, "failed to query trash folder");
+                Log.w(TAG, "failed to query trash folder"); // 查询回收站失败
             }
-        } finally {
+        } finally { // 确保游标关闭
             if (c != null) {
-                c.close();
+                c.close(); // 关闭游标
                 c = null;
             }
         }
 
-        // sync folder first
+        // 首先同步文件夹
         syncFolder();
 
-        // for note existing in database
+        // 处理数据库中存在的笔记
         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 {
+            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) // 查询类型为笔记且不在回收站的记录
+            }, NoteColumns.TYPE + " DESC"); // 根据类型降序排列
+            if (c != null) { // 如果查询成功
+                while (c.moveToNext()) { // 遍历查询结果
+                    gid = c.getString(SqlNote.GTASK_ID_COLUMN); // 获取 GID
+                    node = mGTaskHashMap.get(gid); // 从哈希表中获取节点
+                    if (node != null) { // 如果节点存在
+                        mGTaskHashMap.remove(gid); // 从哈希表中移除节点
+                        mGidToNid.put(gid, c.getLong(SqlNote.ID_COLUMN)); // GID 到 NID 映射
+                        mNidToGid.put(c.getLong(SqlNote.ID_COLUMN), gid); // NID 到 GID 映射
+                        syncType = node.getSyncAction(c); // 获取同步类型
+                    } else { // 如果节点不存在
                         if (c.getString(SqlNote.GTASK_ID_COLUMN).trim().length() == 0) {
-                            // local add
+                            // 本地添加
                             syncType = Node.SYNC_ACTION_ADD_REMOTE;
                         } else {
-                            // remote delete
+                            // 远程删除
                             syncType = Node.SYNC_ACTION_DEL_LOCAL;
                         }
                     }
-                    doContentSync(syncType, node, c);
+                    doContentSync(syncType, node, c); // 执行内容同步
                 }
             } else {
-                Log.w(TAG, "failed to query existing note in database");
+                Log.w(TAG, "failed to query existing note in database"); // 查询数据库中的笔记失败
             }
 
-        } finally {
+        } finally { // 确保游标关闭
             if (c != null) {
-                c.close();
+                c.close(); // 关闭游标
                 c = null;
             }
         }
 
-        // go through remaining items
+        // 遍历剩余项
         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);
+        while (iter.hasNext()) { // 遍历哈希表
+            Map.Entry<String, Node> entry = iter.next(); // 获取每个条目
+            node = entry.getValue(); // 获取节点
+            doContentSync(Node.SYNC_ACTION_ADD_LOCAL, node, null); // 执行本地添加同步
         }
 
-        // mCancelled can be set by another thread, so we neet to check one by
-        // one
-        // clear local delete table
+        // mCancelled 可能由另一个线程设置，因此需要逐个检查
+        // 清除本地删除表
         if (!mCancelled) {
-            if (!DataUtils.batchDeleteNotes(mContentResolver, mLocalDeleteIdMap)) {
-                throw new ActionFailureException("failed to batch-delete local deleted notes");
+            if (!DataUtils.batchDeleteNotes(mContentResolver, mLocalDeleteIdMap)) { // 执行批量删除
+                throw new ActionFailureException("failed to batch-delete local deleted notes"); // 抛出操作失败异常
             }
         }
 
-        // refresh local sync id
+        // 刷新本地同步 ID
         if (!mCancelled) {
-            GTaskClient.getInstance().commitUpdate();
-            refreshLocalSyncId();
+            GTaskClient.getInstance().commitUpdate(); // 提交更新
+            refreshLocalSyncId(); // 刷新本地同步 ID
         }
-
     }
 
+    // 同步文件夹的方法
     private void syncFolder() throws NetworkFailureException {
-        Cursor c = null;
-        String gid;
-        Node node;
-        int syncType;
+        Cursor c = null; // 声明游标
+        String gid; // 存储 GID
+        Node node; // 声明节点
+        int syncType; // 同步类型
 
-        if (mCancelled) {
+        if (mCancelled) { // 如果已取消则返回
             return;
         }
 
-        // for root folder
+        // 处理根文件夹
         try {
-            c = mContentResolver.query(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI,
-                    Notes.ID_ROOT_FOLDER), SqlNote.PROJECTION_NOTE, null, null, null);
-            if (c != null) {
-                c.moveToNext();
-                gid = c.getString(SqlNote.GTASK_ID_COLUMN);
-                node = mGTaskHashMap.get(gid);
-                if (node != null) {
-                    mGTaskHashMap.remove(gid);
-                    mGidToNid.put(gid, (long) Notes.ID_ROOT_FOLDER);
-                    mNidToGid.put((long) Notes.ID_ROOT_FOLDER, gid);
-                    // for system folder, only update remote name if necessary
-                    if (!node.getName().equals(
-                            GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_DEFAULT))
-                        doContentSync(Node.SYNC_ACTION_UPDATE_REMOTE, node, c);
+            c = mContentResolver.query(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, Notes.ID_ROOT_FOLDER), SqlNote.PROJECTION_NOTE, null, null, null); // 查询根文件夹
+            if (c != null) { // 如果查询成功
+                c.moveToNext(); // 移动到第一条记录
+                gid = c.getString(SqlNote.GTASK_ID_COLUMN); // 获取 GID
+                node = mGTaskHashMap.get(gid); // 从哈希表中获取节点
+                if (node != null) { // 如果节点存在
+                    mGTaskHashMap.remove(gid); // 从哈希表中移除节点
+                    mGidToNid.put(gid, (long) Notes.ID_ROOT_FOLDER); // GID 到 NID 映射
+                    mNidToGid.put((long) Notes.ID_ROOT_FOLDER, gid); // NID 到 GID 映射
+                    // 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); // 执行更新同步
                 } else {
-                    doContentSync(Node.SYNC_ACTION_ADD_REMOTE, node, c);
+                    doContentSync(Node.SYNC_ACTION_ADD_REMOTE, node, c); // 执行添加同步
                 }
             } else {
-                Log.w(TAG, "failed to query root folder");
+                Log.w(TAG, "failed to query root folder"); // 查询根文件夹失败
             }
-        } finally {
+        } finally { // 确保游标关闭
             if (c != null) {
-                c.close();
+                c.close(); // 关闭游标
                 c = null;
             }
         }
 
-        // for call-note folder
+        // 处理通话记录文件夹
         try {
-            c = mContentResolver.query(Notes.CONTENT_NOTE_URI, SqlNote.PROJECTION_NOTE, "(_id=?)",
-                    new String[] {
-                        String.valueOf(Notes.ID_CALL_RECORD_FOLDER)
-                    }, null);
-            if (c != null) {
-                if (c.moveToNext()) {
-                    gid = c.getString(SqlNote.GTASK_ID_COLUMN);
-                    node = mGTaskHashMap.get(gid);
-                    if (node != null) {
-                        mGTaskHashMap.remove(gid);
-                        mGidToNid.put(gid, (long) Notes.ID_CALL_RECORD_FOLDER);
-                        mNidToGid.put((long) Notes.ID_CALL_RECORD_FOLDER, gid);
-                        // for system folder, only update remote name if
-                        // necessary
-                        if (!node.getName().equals(
-                                GTaskStringUtils.MIUI_FOLDER_PREFFIX
-                                        + GTaskStringUtils.FOLDER_CALL_NOTE))
-                            doContentSync(Node.SYNC_ACTION_UPDATE_REMOTE, node, c);
+            c = mContentResolver.query(Notes.CONTENT_NOTE_URI, SqlNote.PROJECTION_NOTE, "(_id=?)", new String[] {
+                    String.valueOf(Notes.ID_CALL_RECORD_FOLDER) // 根据 ID 查询通话记录文件夹
+            }, null);
+            if (c != null) { // 如果查询成功
+                if (c.moveToNext()) { // 移动到第一条记录
+                    gid = c.getString(SqlNote.GTASK_ID_COLUMN); // 获取 GID
+                    node = mGTaskHashMap.get(gid); // 从哈希表中获取节点
+                    if (node != null) { // 如果节点存在
+                        mGTaskHashMap.remove(gid); // 从哈希表中移除节点
+                        mGidToNid.put(gid, (long) Notes.ID_CALL_RECORD_FOLDER); // GID 到 NID 映射
+                        mNidToGid.put((long) Notes.ID_CALL_RECORD_FOLDER, gid); // NID 到 GID 映射
+                        // 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_CALL_NOTE))
+                            doContentSync(Node.SYNC_ACTION_UPDATE_REMOTE, node, c); // 执行更新同步
                     } else {
-                        doContentSync(Node.SYNC_ACTION_ADD_REMOTE, node, c);
+                        doContentSync(Node.SYNC_ACTION_ADD_REMOTE, node, c); // 执行添加同步
                     }
                 }
             } else {
-                Log.w(TAG, "failed to query call note folder");
+                Log.w(TAG, "failed to query call note folder"); // 查询通话记录文件夹失败
             }
-        } finally {
+        } finally { // 确保游标关闭
             if (c != null) {
-                c.close();
+                c.close(); // 关闭游标
                 c = null;
             }
         }
 
-        // for local existing folders
+        // 处理本地现有的文件夹
         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);
+            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) // 查询类型为文件夹且不在回收站的记录
+            }, NoteColumns.TYPE + " DESC"); // 根据类型降序排列
+            if (c != null) { // 如果查询成功
+                while (c.moveToNext()) { // 遍历查询结果
+                    gid = c.getString(SqlNote.GTASK_ID_COLUMN); // 获取 GID
+                    node = mGTaskHashMap.get(gid); // 从哈希表中获取节点
+                    if (node != null) { // 如果节点存在
+                        mGTaskHashMap.remove(gid); // 从哈希表中移除节点
+                        mGidToNid.put(gid, c.getLong(SqlNote.ID_COLUMN)); // GID 到 NID 映射
+                        mNidToGid.put(c.getLong(SqlNote.ID_COLUMN), gid); // NID 到 GID 映射
+                        syncType = node.getSyncAction(c); // 获取同步类型
                     } else {
                         if (c.getString(SqlNote.GTASK_ID_COLUMN).trim().length() == 0) {
-                            // local add
+                            // 本地添加
                             syncType = Node.SYNC_ACTION_ADD_REMOTE;
                         } else {
-                            // remote delete
+                            // 远程删除
                             syncType = Node.SYNC_ACTION_DEL_LOCAL;
                         }
                     }
-                    doContentSync(syncType, node, c);
+                    doContentSync(syncType, node, c); // 执行内容同步
                 }
             } else {
-                Log.w(TAG, "failed to query existing folder");
+                Log.w(TAG, "failed to query existing folder"); // 查询已有文件夹失败
             }
-        } finally {
+        } finally { // 确保游标关闭
             if (c != null) {
-                c.close();
+                c.close(); // 关闭游标
                 c = null;
             }
         }
 
-        // for remote add folders
+        // 处理远程添加的文件夹
         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);
+        while (iter.hasNext()) { // 遍历哈希表
+            Map.Entry<String, TaskList> entry = iter.next(); // 获取每个条目
+            gid = entry.getKey(); // 获取 GID
+            node = entry.getValue(); // 获取节点
+            if (mGTaskHashMap.containsKey(gid)) { // 如果哈希表中包含该 GID
+                mGTaskHashMap.remove(gid); // 从哈希表中移除该节点
+                doContentSync(Node.SYNC_ACTION_ADD_LOCAL, node, null); // 执行本地添加同步
             }
         }
 
-        if (!mCancelled)
-            GTaskClient.getInstance().commitUpdate();
+        if (!mCancelled) // 如果未取消
+            GTaskClient.getInstance().commitUpdate(); // 提交更新
     }
 
+    // 执行内容同步的具体操作
     private void doContentSync(int syncType, Node node, Cursor c) throws NetworkFailureException {
-        if (mCancelled) {
+        if (mCancelled) { // 如果已取消则返回
             return;
         }
 
-        MetaData meta;
-        switch (syncType) {
-            case Node.SYNC_ACTION_ADD_LOCAL:
-                addLocalNode(node);
+        MetaData meta; // 声明元数据
+        switch (syncType) { // 根据同步类型执行不同操作
+            case Node.SYNC_ACTION_ADD_LOCAL: // 本地添加
+                addLocalNode(node); // 调用添加本地节点的方法
                 break;
-            case Node.SYNC_ACTION_ADD_REMOTE:
-                addRemoteNode(node, c);
+            case Node.SYNC_ACTION_ADD_REMOTE: // 远程添加
+                addRemoteNode(node, c); // 调用添加远程节点的方法
                 break;
-            case Node.SYNC_ACTION_DEL_LOCAL:
-                meta = mMetaHashMap.get(c.getString(SqlNote.GTASK_ID_COLUMN));
+            case Node.SYNC_ACTION_DEL_LOCAL: // 本地删除
+                meta = mMetaHashMap.get(c.getString(SqlNote.GTASK_ID_COLUMN)); // 获取元数据
                 if (meta != null) {
-                    GTaskClient.getInstance().deleteNode(meta);
+                    GTaskClient.getInstance().deleteNode(meta); // 删除远程节点
                 }
-                mLocalDeleteIdMap.add(c.getLong(SqlNote.ID_COLUMN));
+                mLocalDeleteIdMap.add(c.getLong(SqlNote.ID_COLUMN)); // 添加到本地删除 ID 集合
                 break;
-            case Node.SYNC_ACTION_DEL_REMOTE:
-                meta = mMetaHashMap.get(node.getGid());
+            case Node.SYNC_ACTION_DEL_REMOTE: // 远程删除
+                meta = mMetaHashMap.get(node.getGid()); // 获取元数据
                 if (meta != null) {
-                    GTaskClient.getInstance().deleteNode(meta);
+                    GTaskClient.getInstance().deleteNode(meta); // 删除远程元节点
                 }
-                GTaskClient.getInstance().deleteNode(node);
+                GTaskClient.getInstance().deleteNode(node); // 删除远程节点
                 break;
-            case Node.SYNC_ACTION_UPDATE_LOCAL:
-                updateLocalNode(node, c);
+            case Node.SYNC_ACTION_UPDATE_LOCAL: // 本地更新
+                updateLocalNode(node, c); // 调用更新本地节点的方法
                 break;
-            case Node.SYNC_ACTION_UPDATE_REMOTE:
-                updateRemoteNode(node, c);
+            case Node.SYNC_ACTION_UPDATE_REMOTE: // 远程更新
+                updateRemoteNode(node, c); // 调用更新远程节点的方法
                 break;
-            case Node.SYNC_ACTION_UPDATE_CONFLICT:
-                // merging both modifications maybe a good idea
-                // right now just use local update simply
-                updateRemoteNode(node, c);
+            case Node.SYNC_ACTION_UPDATE_CONFLICT: // 更新冲突
+                // 将两种修改合并可能是个好主意
+                // 目前简单地使用本地更新
+                updateRemoteNode(node, c); // 调用更新远程节点的方法
                 break;
-            case Node.SYNC_ACTION_NONE:
+            case Node.SYNC_ACTION_NONE: // 无需操作
                 break;
-            case Node.SYNC_ACTION_ERROR:
+            case Node.SYNC_ACTION_ERROR: // 错误操作类型
             default:
-                throw new ActionFailureException("unkown sync action type");
+                throw new ActionFailureException("unknown sync action type"); // 抛出操作失败异常
         }
     }
 
+    // 添加本地节点的方法
     private void addLocalNode(Node node) throws NetworkFailureException {
-        if (mCancelled) {
+        if (mCancelled) { // 如果已取消则返回
             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);
+        SqlNote sqlNote; // 声明 SQL 笔记对象
+        if (node instanceof TaskList) { // 如果节点是任务列表
+            if (node.getName().equals(GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_DEFAULT)) { // 如果是默认文件夹
+                sqlNote = new SqlNote(mContext, Notes.ID_ROOT_FOLDER); // 创建 SQL 笔记对象
+            } else if (node.getName().equals(GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_CALL_NOTE)) { // 如果是通话记录文件夹
+                sqlNote = new SqlNote(mContext, Notes.ID_CALL_RECORD_FOLDER); // 创建 SQL 笔记对象
             } else {
-                sqlNote = new SqlNote(mContext);
-                sqlNote.setContent(node.getLocalJSONFromContent());
-                sqlNote.setParentId(Notes.ID_ROOT_FOLDER);
+                sqlNote = new SqlNote(mContext); // 创建新的 SQL 笔记对象
+                sqlNote.setContent(node.getLocalJSONFromContent()); // 设置内容
+                sqlNote.setParentId(Notes.ID_ROOT_FOLDER); // 设置父 ID 为根文件夹
             }
-        } else {
-            sqlNote = new SqlNote(mContext);
-            JSONObject js = node.getLocalJSONFromContent();
+        } else { // 如果节点是普通任务
+            sqlNote = new SqlNote(mContext); // 创建新的 SQL 笔记对象
+            JSONObject js = node.getLocalJSONFromContent(); // 获取任务的本地 JSON 内容
             try {
-                if (js.has(GTaskStringUtils.META_HEAD_NOTE)) {
-                    JSONObject note = js.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
-                    if (note.has(NoteColumns.ID)) {
-                        long id = note.getLong(NoteColumns.ID);
-                        if (DataUtils.existInNoteDatabase(mContentResolver, id)) {
-                            // the id is not available, have to create a new one
-                            note.remove(NoteColumns.ID);
-                        }
-                    }
-                }
-
-                if (js.has(GTaskStringUtils.META_HEAD_DATA)) {
-                    JSONArray dataArray = js.getJSONArray(GTaskStringUtils.META_HEAD_DATA);
-                    for (int i = 0; i < dataArray.length(); i++) {
-                        JSONObject data = dataArray.getJSONObject(i);
-                        if (data.has(DataColumns.ID)) {
-                            long dataId = data.getLong(DataColumns.ID);
-                            if (DataUtils.existInDataDatabase(mContentResolver, dataId)) {
-                                // the data id is not available, have to create
-                                // a new one
-                                data.remove(DataColumns.ID);
-                            }
+                if (js.has(GTaskStringUtils.META_HEAD_NOTE)) { // 如果 JSON 内容中有 HEAD_NOTE
+                    JSONObject note = js.getJSONObject(GTaskStringUtils.META_HEAD_NOTE); // 获取 NOTE 对象
+                    if (note.has(NoteColumns.ID)) { // 如果 NOTE 对象中有 ID
+                        long id = note.getLong(NoteColumns.ID); // 获取 ID
+                        if (DataUtils.existInNoteDatabase(mContentResolver, id)) { // 检查 ID 是否存在于数据库中
+                            // ID 不可用，必须创建一个新 ID
+                            note.remove(NoteColumns.ID); // 移除 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");
+                // 检查 JSON 对象是否包含 META_HEAD_DATA 字段
+if (js.has(GTaskStringUtils.META_HEAD_DATA)) {
+    JSONArray dataArray = js.getJSONArray(GTaskStringUtils.META_HEAD_DATA); // 获取数据数组
+    for (int i = 0; i < dataArray.length(); i++) { // 遍历数据数组
+        JSONObject data = dataArray.getJSONObject(i); // 获取每个数据的 JSON 对象
+        if (data.has(DataColumns.ID)) { // 如果数据对象中包含 ID 字段
+            long dataId = data.getLong(DataColumns.ID); // 获取数据的 ID
+            if (DataUtils.existInDataDatabase(mContentResolver, dataId)) { // 检查数据 ID 是否在数据库中存在
+                // 如果数据 ID 不可用，则移除 ID 字段
+                data.remove(DataColumns.ID);
             }
-            sqlNote.setParentId(parentId.longValue());
         }
+    }
+}
 
-        // create the local node
-        sqlNote.setGtaskId(node.getGid());
-        sqlNote.commit(false);
+// 捕获 JSON 异常
+} catch (JSONException e) {
+    Log.w(TAG, e.toString()); // 记录警告日志
+    e.printStackTrace(); // 打印堆栈跟踪
+}
 
-        // update gid-nid mapping
-        mGidToNid.put(node.getGid(), sqlNote.getId());
-        mNidToGid.put(sqlNote.getId(), node.getGid());
+// 设置 SQL 笔记对象的内容为 JSON
+sqlNote.setContent(js);
 
-        // update meta
-        updateRemoteMeta(node.getGid(), sqlNote);
-    }
+// 获取父任务的 ID
+Long parentId = mGidToNid.get(((Task) node).getParent().getGid());
+if (parentId == null) { // 如果找不到父任务 ID
+    Log.e(TAG, "cannot find task's parent id locally"); // 记录错误日志
+    throw new ActionFailureException("cannot add local node"); // 抛出操作失败异常
+}
+sqlNote.setParentId(parentId.longValue()); // 设置 SQL 笔记的父 ID
 
-    private void updateLocalNode(Node node, Cursor c) throws NetworkFailureException {
-        if (mCancelled) {
-            return;
-        }
+// 创建本地节点
+sqlNote.setGtaskId(node.getGid()); // 设置 GTask ID
+sqlNote.commit(false); // 提交笔记内容，不同步到远程
 
-        SqlNote sqlNote;
-        // update the note locally
-        sqlNote = new SqlNote(mContext, c);
-        sqlNote.setContent(node.getLocalJSONFromContent());
+// 更新 GID-NID 映射
+mGidToNid.put(node.getGid(), sqlNote.getId()); // GID 到 NID 的映射
+mNidToGid.put(sqlNote.getId(), node.getGid()); // NID 到 GID 的映射
 
-        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);
+// 更新元数据
+updateRemoteMeta(node.getGid(), sqlNote); // 更新远程元数据
 
-        // update meta info
-        updateRemoteMeta(node.getGid(), sqlNote);
+// 更新本地节点的方法
+private void updateLocalNode(Node node, Cursor c) throws NetworkFailureException {
+    if (mCancelled) { // 如果已取消则返回
+        return;
     }
 
-    private void addRemoteNode(Node node, Cursor c) throws NetworkFailureException {
-        if (mCancelled) {
-            return;
-        }
+    SqlNote sqlNote; // 声明 SQL 笔记对象
+    // 在本地更新笔记
+    sqlNote = new SqlNote(mContext, c); // 根据游标初始化 SQL 笔记
+    sqlNote.setContent(node.getLocalJSONFromContent()); // 设置内容为节点的本地 JSON
+
+    // 获取父 ID
+    Long parentId = (node instanceof Task) ? mGidToNid.get(((Task) node).getParent().getGid())
+            : new Long(Notes.ID_ROOT_FOLDER); // 如果节点是任务，则获取任务的父 ID；否则使用根文件夹 ID
+    if (parentId == null) { // 如果找不到父任务 ID
+        Log.e(TAG, "cannot find task's parent id locally"); // 记录错误日志
+        throw new ActionFailureException("cannot update local node"); // 抛出操作失败异常
+    }
+    sqlNote.setParentId(parentId.longValue()); // 设置 SQL 笔记的父 ID
+    sqlNote.commit(true); // 提交笔记内容并同步到远程
 
-        SqlNote sqlNote = new SqlNote(mContext, c);
-        Node n;
+    // 更新元信息
+    updateRemoteMeta(node.getGid(), sqlNote); // 更新远程元数据
+}
 
-        // update remotely
-        if (sqlNote.isNoteType()) {
-            Task task = new Task();
-            task.setContentByLocalJSON(sqlNote.getContent());
+// 添加远程节点的方法
+private void addRemoteNode(Node node, Cursor c) throws NetworkFailureException {
+    if (mCancelled) { // 如果已取消则返回
+        return;
+    }
 
-            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);
+    SqlNote sqlNote = new SqlNote(mContext, c); // 根据游标初始化 SQL 笔记
+    Node n; // 声明节点
 
-            GTaskClient.getInstance().createTask(task);
-            n = (Node) task;
+    // 更新远程内容
+    if (sqlNote.isNoteType()) { // 如果是笔记类型
+        Task task = new Task(); // 创建任务对象
+        task.setContentByLocalJSON(sqlNote.getContent()); // 从 SQL 笔记获取本地内容
 
-            // add meta
-            updateRemoteMeta(task.getGid(), sqlNote);
-        } else {
-            TaskList tasklist = null;
-
-            // we need to skip folder if it has already existed
-            String folderName = GTaskStringUtils.MIUI_FOLDER_PREFFIX;
-            if (sqlNote.getId() == Notes.ID_ROOT_FOLDER)
-                folderName += GTaskStringUtils.FOLDER_DEFAULT;
-            else if (sqlNote.getId() == Notes.ID_CALL_RECORD_FOLDER)
-                folderName += GTaskStringUtils.FOLDER_CALL_NOTE;
-            else
-                folderName += sqlNote.getSnippet();
-
-            Iterator<Map.Entry<String, TaskList>> iter = mGTaskListHashMap.entrySet().iterator();
-            while (iter.hasNext()) {
-                Map.Entry<String, TaskList> entry = iter.next();
-                String gid = entry.getKey();
-                TaskList list = entry.getValue();
-
-                if (list.getName().equals(folderName)) {
-                    tasklist = list;
-                    if (mGTaskHashMap.containsKey(gid)) {
-                        mGTaskHashMap.remove(gid);
-                    }
-                    break;
+        String parentGid = mNidToGid.get(sqlNote.getParentId()); // 获取父任务的 GID
+        if (parentGid == null) { // 如果找不到父任务 GID
+            Log.e(TAG, "cannot find task's parent tasklist"); // 记录错误日志
+            throw new ActionFailureException("cannot add remote task"); // 抛出操作失败异常
+        }
+        mGTaskListHashMap.get(parentGid).addChildTask(task); // 将任务添加到父任务列表
+
+        GTaskClient.getInstance().createTask(task); // 在远程创建任务
+        n = (Node) task; // 将任务赋值给节点 n
+
+        // 添加元数据
+        updateRemoteMeta(task.getGid(), sqlNote); // 更新远程元数据
+    } else { // 如果是文件夹类型
+        TaskList tasklist = null;
+
+        // 如果文件夹已经存在，则跳过
+        String folderName = GTaskStringUtils.MIUI_FOLDER_PREFFIX; // 设置文件夹名称前缀
+        if (sqlNote.getId() == Notes.ID_ROOT_FOLDER) // 根文件夹
+            folderName += GTaskStringUtils.FOLDER_DEFAULT;
+        else if (sqlNote.getId() == Notes.ID_CALL_RECORD_FOLDER) // 通话记录文件夹
+            folderName += GTaskStringUtils.FOLDER_CALL_NOTE;
+        else // 其他文件夹
+            folderName += sqlNote.getSnippet();
+
+        // 检查现有任务列表中是否已存在该文件夹
+        Iterator<Map.Entry<String, TaskList>> iter = mGTaskListHashMap.entrySet().iterator();
+        while (iter.hasNext()) { // 遍历任务列表
+            Map.Entry<String, TaskList> entry = iter.next(); // 获取每个条目
+            String gid = entry.getKey(); // 获取 GID
+            TaskList list = entry.getValue(); // 获取任务列表
+
+            if (list.getName().equals(folderName)) { // 如果找到匹配的文件夹名称
+                tasklist = list; // 获取文件夹
+                if (mGTaskHashMap.containsKey(gid)) { // 如果任务哈希表中包含该 GID
+                    mGTaskHashMap.remove(gid); // 移除该 GID
                 }
+                break; // 退出循环
             }
-
-            // no match we can add now
-            if (tasklist == null) {
-                tasklist = new TaskList();
-                tasklist.setContentByLocalJSON(sqlNote.getContent());
-                GTaskClient.getInstance().createTaskList(tasklist);
-                mGTaskListHashMap.put(tasklist.getGid(), tasklist);
-            }
-            n = (Node) tasklist;
         }
 
-        // update local note
-        sqlNote.setGtaskId(n.getGid());
-        sqlNote.commit(false);
-        sqlNote.resetLocalModified();
-        sqlNote.commit(true);
-
-        // gid-id mapping
-        mGidToNid.put(n.getGid(), sqlNote.getId());
-        mNidToGid.put(sqlNote.getId(), n.getGid());
+        // 如果没有找到匹配的文件夹，则创建新的文件夹
+        if (tasklist == null) {
+            tasklist = new TaskList(); // 创建新的任务列表
+            tasklist.setContentByLocalJSON(sqlNote.getContent()); // 设置任务列表内容
+            GTaskClient.getInstance().createTaskList(tasklist); // 在远程创建任务列表
+            mGTaskListHashMap.put(tasklist.getGid(), tasklist); // 将任务列表添加到哈希表
+        }
+        n = (Node) tasklist; // 将任务列表赋值给节点 n
     }
 
-    private void updateRemoteNode(Node node, Cursor c) throws NetworkFailureException {
-        if (mCancelled) {
-            return;
-        }
+    // 更新本地笔记
+    sqlNote.setGtaskId(n.getGid()); // 设置 GTask ID
+    sqlNote.commit(false); // 提交笔记内容，不同步到远程
+    sqlNote.resetLocalModified(); // 重置本地修改标记
+    sqlNote.commit(true); // 提交并同步到远程
 
-        SqlNote sqlNote = new SqlNote(mContext, c);
+    // 更新 GID-ID 映射
+    mGidToNid.put(n.getGid(), sqlNote.getId()); // GID 到 NID 的映射
+    mNidToGid.put(sqlNote.getId(), n.getGid()); // NID 到 GID 的映射
+}
 
-        // update remotely
-        node.setContentByLocalJSON(sqlNote.getContent());
-        GTaskClient.getInstance().addUpdateNode(node);
+// 更新远程节点的方法
+private void updateRemoteNode(Node node, Cursor c) throws NetworkFailureException {
+    if (mCancelled) { // 如果已取消则返回
+        return;
+    }
 
-        // update meta
-        updateRemoteMeta(node.getGid(), sqlNote);
+    SqlNote sqlNote = new SqlNote(mContext, c); // 根据游标初始化 SQL 笔记
 
-        // move task if necessary
-        if (sqlNote.isNoteType()) {
-            Task task = (Task) node;
-            TaskList preParentList = task.getParent();
+    // 更新远程内容
+    node.setContentByLocalJSON(sqlNote.getContent()); // 设置节点内容
+    GTaskClient.getInstance().addUpdateNode(node); // 添加更新节点
 
-            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);
+    // 更新元数据
+    updateRemoteMeta(node.getGid(), sqlNote); // 更新远程元数据
 
-            if (preParentList != curParentList) {
-                preParentList.removeChildTask(task);
-                curParentList.addChildTask(task);
-                GTaskClient.getInstance().moveTask(task, preParentList, curParentList);
-            }
-        }
+    // 如果需要，移动任务
+    if (sqlNote.isNoteType()) { // 如果节点是笔记类型
+        Task task = (Task) node; // 将节点转换为任务
+        TaskList preParentList = task.getParent(); // 获取原父任务列表
 
-        // clear local modified flag
-        sqlNote.resetLocalModified();
-        sqlNote.commit(true);
-    }
+        String curParentGid = mNidToGid.get(sqlNote.getParentId()); // 获取当前父任务 GID
+        if (curParentGid == null) { // 如果找不到父任务 GID
+            Log.e(TAG, "cannot find task's parent tasklist"); // 记录错误日志
+            throw new ActionFailureException("cannot update remote task"); // 抛出操作失败异常
+        }
+        TaskList curParentList = mGTaskListHashMap.get(curParentGid); // 获取当前父任务列表
 
-    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);
-            }
+        // 如果前一个父列表与当前父列表不同，则移动任务
+        if (preParentList != curParentList) {
+            preParentList.removeChildTask(task); // 从原父列表中移除任务
+            curParentList.addChildTask(task); // 将任务添加到当前父列表
+            GTaskClient.getInstance().moveTask(task, preParentList, curParentList); // 移动任务至远程
         }
     }
 
-    private void refreshLocalSyncId() throws NetworkFailureException {
-        if (mCancelled) {
-            return;
+    // 清除本地修改标记
+    sqlNote.resetLocalModified(); // 重置本地修改标记
+    sqlNote.commit(true); // 提交并同步到远程
+}
+
+// 更新远程元数据的方法
+private void updateRemoteMeta(String gid, SqlNote sqlNote) throws NetworkFailureException {
+    if (sqlNote != null && sqlNote.isNoteType()) { // 如果 SQL 笔记不为 null 且是笔记类型
+        MetaData metaData = mMetaHashMap.get(gid); // 获取元数据对象
+        if (metaData != null) { // 如果元数据存在
+            metaData.setMeta(gid, sqlNote.getContent()); // 更新元数据内容
+            GTaskClient.getInstance().addUpdateNode(metaData); // 在远程更新元数据
+        } else { // 如果元数据不存在
+            metaData = new MetaData(); // 创建新的元数据对象
+            metaData.setMeta(gid, sqlNote.getContent()); // 设置元数据内容
+            mMetaList.addChildTask(metaData); // 将元数据添加到元数据列表
+            mMetaHashMap.put(gid, metaData); // 更新元数据哈希表
+            GTaskClient.getInstance().createTask(metaData); // 在远程创建元数据
         }
+    }
+}
 
-        // get the latest gtask list
-        mGTaskHashMap.clear();
-        mGTaskListHashMap.clear();
-        mMetaHashMap.clear();
-        initGTaskList();
+// 刷新本地同步 ID 的方法
+private void refreshLocalSyncId() throws NetworkFailureException {
+    if (mCancelled) { // 如果已取消则返回
+        return;
+    }
 
-        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");
-                    }
+    // 获取最新的 GTask 列表
+    mGTaskHashMap.clear(); // 清空任务哈希表
+    mGTaskListHashMap.clear(); // 清空任务列表哈希表
+    mMetaHashMap.clear(); // 清空元数据哈希表
+    initGTaskList(); // 初始化 GTask 列表
+
+    Cursor c = null; // 声明游标
+    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) // 查询非系统类型且不在回收站的笔记
+                }, NoteColumns.TYPE + " DESC"); // 根据类型降序排列
+        if (c != null) { // 如果查询成功
+            while (c.moveToNext()) { // 遍历查询结果
+                String gid = c.getString(SqlNote.GTASK_ID_COLUMN); // 获取 GID
+                Node node = mGTaskHashMap.get(gid); // 从哈希表中获取节点
+                if (node != null) { // 如果节点存在
+                    mGTaskHashMap.remove(gid); // 从哈希表中移除节点
+                    ContentValues values = new ContentValues(); // 创建内容值对象
+                    values.put(NoteColumns.SYNC_ID, node.getLastModified()); // 更新同步 ID
+                    mContentResolver.update(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI,
+                            c.getLong(SqlNote.ID_COLUMN)), values, null, null); // 更新内容
+                } else {
+                    Log.e(TAG, "something is missed"); // 记录错误日志
+                    throw new ActionFailureException("some local items don't have gid after sync"); // 抛出操作失败异常
                 }
-            } else {
-                Log.w(TAG, "failed to query local note to refresh sync id");
-            }
-        } finally {
-            if (c != null) {
-                c.close();
-                c = null;
             }
+        } else {
+            Log.w(TAG, "failed to query local note to refresh sync id"); // 查询本地笔记以刷新同步 ID 失败
+        }
+    } finally { // 确保游标关闭
+        if (c != null) {
+            c.close(); // 关闭游标
+            c = null;
         }
     }
+}
 
-    public String getSyncAccount() {
-        return GTaskClient.getInstance().getSyncAccount().name;
-    }
+// 获取同步帐户信息的方法
+public String getSyncAccount() {
+    return GTaskClient.getInstance().getSyncAccount().name; // 返回同步帐户名
+}
 
-    public void cancelSync() {
-        mCancelled = true;
-    }
+// 取消同步操作的方法
+public void cancelSync() {
+    mCancelled = true; // 设置取消标志
 }
diff --git a/src/net/micode/notes/gtask/remote/GTaskSyncService.java b/src/net/micode/notes/gtask/remote/GTaskSyncService.java
index cca36f7..2421024 100644
--- a/src/net/micode/notes/gtask/remote/GTaskSyncService.java
+++ b/src/net/micode/notes/gtask/remote/GTaskSyncService.java
@@ -16,6 +16,7 @@
 
 package net.micode.notes.gtask.remote;
 
+// 导入必要的Android类
 import android.app.Activity;
 import android.app.Service;
 import android.content.Context;
@@ -23,106 +24,135 @@ import android.content.Intent;
 import android.os.Bundle;
 import android.os.IBinder;
 
+// 定义GTaskSyncService类，继承自Service
 public class GTaskSyncService extends Service {
+    // 定义同步动作的字符串名称
     public final static String ACTION_STRING_NAME = "sync_action_type";
 
+    // 定义开始同步的动作标识
     public final static int ACTION_START_SYNC = 0;
 
+    // 定义取消同步的动作标识
     public final static int ACTION_CANCEL_SYNC = 1;
 
+    // 定义无效动作的标识
     public final static int ACTION_INVALID = 2;
 
+    // 定义广播名称，用于发送同步服务的广播
     public final static String GTASK_SERVICE_BROADCAST_NAME = "net.micode.notes.gtask.remote.gtask_sync_service";
 
+    // 定义广播中表示是否正在同步的键
     public final static String GTASK_SERVICE_BROADCAST_IS_SYNCING = "isSyncing";
 
+    // 定义广播中表示进度消息的键
     public final static String GTASK_SERVICE_BROADCAST_PROGRESS_MSG = "progressMsg";
 
+    // 静态变量，表示当前的异步同步任务
     private static GTaskASyncTask mSyncTask = null;
 
+    // 静态变量，保存同步进度消息
     private static String mSyncProgress = "";
 
+    // 启动同步的方法
     private void startSync() {
+        // 如果当前没有正在进行的同步任务
         if (mSyncTask == null) {
+            // 创建新的异步同步任务
             mSyncTask = new GTaskASyncTask(this, new GTaskASyncTask.OnCompleteListener() {
+                // 同步完成时的回调
                 public void onComplete() {
-                    mSyncTask = null;
-                    sendBroadcast("");
-                    stopSelf();
+                    mSyncTask = null; // 清空任务
+                    sendBroadcast(""); // 发送广播
+                    stopSelf(); // 停止服务
                 }
             });
-            sendBroadcast("");
-            mSyncTask.execute();
+            sendBroadcast(""); // 发送广播，通知开始同步
+            mSyncTask.execute(); // 执行同步任务
         }
     }
 
+    // 取消同步的方法
     private void cancelSync() {
+        // 如果有同步任务在运行
         if (mSyncTask != null) {
-            mSyncTask.cancelSync();
+            mSyncTask.cancelSync(); // 取消同步
         }
     }
 
+    // 服务创建时调用的方法
     @Override
     public void onCreate() {
-        mSyncTask = null;
+        mSyncTask = null; // 初始化同步任务为null
     }
 
+    // 当服务被启动时调用的方法
     @Override
     public int onStartCommand(Intent intent, int flags, int startId) {
-        Bundle bundle = intent.getExtras();
+        Bundle bundle = intent.getExtras(); // 获取传入的意图数据
+        // 如果意图中包含动作标识
         if (bundle != null && bundle.containsKey(ACTION_STRING_NAME)) {
+            // 根据动作标识进行处理
             switch (bundle.getInt(ACTION_STRING_NAME, ACTION_INVALID)) {
-                case ACTION_START_SYNC:
+                case ACTION_START_SYNC: // 开始同步
                     startSync();
                     break;
-                case ACTION_CANCEL_SYNC:
+                case ACTION_CANCEL_SYNC: // 取消同步
                     cancelSync();
                     break;
                 default:
                     break;
             }
-            return START_STICKY;
+            return START_STICKY; // 表示服务在被系统杀死后应再次启动
         }
-        return super.onStartCommand(intent, flags, startId);
+        return super.onStartCommand(intent, flags, startId); // 调用父类的方法
     }
 
+    // 系统内存不足时调用的方法
     @Override
     public void onLowMemory() {
+        // 如果有正在运行的同步任务，取消它
         if (mSyncTask != null) {
             mSyncTask.cancelSync();
         }
     }
 
+    // 绑定服务的方法，返回null表示不支持绑定
     public IBinder onBind(Intent intent) {
         return null;
     }
 
+    // 发送广播的方法，携带进度消息
     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);
+        mSyncProgress = msg; // 更新进度消息
+        Intent intent = new Intent(GTASK_SERVICE_BROADCAST_NAME); // 创建广播意图
+        intent.putExtra(GTASK_SERVICE_BROADCAST_IS_SYNCING, mSyncTask != null); // 添加正在同步的状态
+        intent.putExtra(GTASK_SERVICE_BROADCAST_PROGRESS_MSG, msg); // 添加进度消息
+        sendBroadcast(intent); // 发送广播
     }
 
+    // 启动同步的静态方法
     public static void startSync(Activity activity) {
-        GTaskManager.getInstance().setActivityContext(activity);
-        Intent intent = new Intent(activity, GTaskSyncService.class);
-        intent.putExtra(GTaskSyncService.ACTION_STRING_NAME, GTaskSyncService.ACTION_START_SYNC);
-        activity.startService(intent);
+        GTaskManager.getInstance().setActivityContext(activity); // 设置上下文
+        Intent intent = new Intent(activity, GTaskSyncService.class); // 创建启动服务的意图
+        intent.putExtra(GTaskSyncService.ACTION_STRING_NAME, GTaskSyncService.ACTION_START_SYNC); // 添加动作标识
+        activity.startService(intent); // 启动服务
     }
 
+    // 取消同步的静态方法
     public static void cancelSync(Context context) {
-        Intent intent = new Intent(context, GTaskSyncService.class);
-        intent.putExtra(GTaskSyncService.ACTION_STRING_NAME, GTaskSyncService.ACTION_CANCEL_SYNC);
-        context.startService(intent);
+        Intent intent = new Intent(context, GTaskSyncService.class); // 创建取消服务的意图
+        intent.putExtra(GTaskSyncService.ACTION_STRING_NAME, GTaskSyncService.ACTION_CANCEL_SYNC); // 添加动作标识
+        context.startService(intent); // 启动服务
     }
 
+    // 静态方法，用于判断当前是否正在同步
     public static boolean isSyncing() {
-        return mSyncTask != null;
+        return mSyncTask != null; // 如果任务不为null，则表示正在同步
     }
 
+    // 静态方法，用于获取当前的进度字符串
     public static String getProgressString() {
-        return mSyncProgress;
+        return mSyncProgress; // 返回同步进度消息
     }
 }
+
diff --git a/src/net/micode/notes/tool/BackupUtils.java b/src/net/micode/notes/tool/BackupUtils.java
index fdf8ece..f98343e 100644
--- a/src/net/micode/notes/tool/BackupUtils.java
+++ b/src/net/micode/notes/tool/BackupUtils.java
@@ -36,9 +36,6 @@ import java.io.IOException;
 import java.io.PrintStream;
 
 
-好的，我将为`BackupUtils.java`文件中的每个语句提供更细致的注释：
-
-```java
 public class BackupUtils {
     private static final String TAG = "BackupUtils"; // 定义日志标签，用于识别日志输出的来源
 
@@ -246,4 +243,576 @@ public class BackupUtils {
                         }
                         String folderId = folderCursor.getString(NOTE_COLUMN_ID);
                         exportFolderToText(folderId
+package net.micode.notes.gtask.remote; // 定义当前类所在的包
+
+import android.accounts.Account; // 引入账户类，表示一个用户账户
+import android.accounts.AccountManager; // 导入账户管理类，用于管理账户及其相关操作
+import android.accounts.AccountManagerFuture; // 导入异步获取账户的类
+import android.app.Activity; // 引入Activity类，代表应用的一个界面
+import android.os.Bundle; // 引入Bundle类，用于存储数据的容器
+import android.text.TextUtils; // 导入工具类，主要用于判断字符串是否为空
+import android.util.Log; // 导入Log类，用于记录日志
+
+import net.micode.notes.gtask.data.Node; // 引入任务节点类
+import net.micode.notes.gtask.data.Task; // 引入任务类
+import net.micode.notes.gtask.data.TaskList; // 引入任务列表类
+import net.micode.notes.gtask.exception.ActionFailureException; // 引入自定义异常类，表示操作失败
+import net.micode.notes.gtask.exception.NetworkFailureException; // 引入自定义异常类，表示网络失败
+import net.micode.notes.tool.GTaskStringUtils; // 引入字符串工具类，提供字符串相关的方法
+import net.micode.notes.ui.NotesPreferenceActivity; // 引入笔记偏好设置活动类
+
+import org.apache.http.HttpEntity; // 引入HTTP实体类，表示请求或响应的消息体
+import org.apache.http.HttpResponse; // 引入HTTP响应类，表示HTTP请求的响应
+import org.apache.http.client.ClientProtocolException; // 引入客户端协议异常类
+import org.apache.http.client.entity.UrlEncodedFormEntity; // 引入URL编码的表单实体类
+import org.apache.http.client.methods.HttpGet; // 引入HTTP GET请求类
+import org.apache.http.client.methods.HttpPost; // 引入HTTP POST请求类
+import org.apache.http.cookie.Cookie; // 引入Cookie类，表示HTTP Cookie
+import org.apache.http.impl.client.BasicCookieStore; // 引入基本的Cookie存储类
+import org.apache.http.impl.client.DefaultHttpClient; // 引入默认的HTTP客户端类
+import org.apache.http.message.BasicNameValuePair; // 引入基本名称值对类，用于表单参数
+import org.apache.http.params.BasicHttpParams; // 引入基本HTTP参数类
+import org.apache.http.params.HttpConnectionParams; // 引入HTTP连接参数类
+import org.apache.http.params.HttpParams; // 引入HTTP参数类
+import org.apache.http.params.HttpProtocolParams; // 引入HTTP协议参数类
+import org.json.JSONArray; // 引入JSON数组类
+import org.json.JSONException; // 引入JSON异常类
+import org.json.JSONObject; // 引入JSON对象类
+
+import java.io.BufferedReader; // 引入缓冲读取器类
+import java.io.IOException; // 引入IO异常类
+import java.io.InputStream; // 引入输入流类
+import java.io.InputStreamReader; // 引入输入流阅读器类
+import java.util.LinkedList; // 引入链表类
+import java.util.List; // 引入列表接口
+import java.util.zip.GZIPInputStream; // 引入GZIP输入流类
+import java.util.zip.Inflater; // 引入解压缩类
+import java.util.zip.InflaterInputStream; // 引入解压缩输入流类
+
+// GTaskClient类，负责与Google任务系统的网络交互
+public class GTaskClient {
+    private static final String TAG = GTaskClient.class.getSimpleName(); // 日志标记，用于日志记录
+
+    // Google任务相关URL常量
+    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; // 单例实例
+
+    private DefaultHttpClient mHttpClient; // 默认HTTP客户端
+    private String mGetUrl; // GET请求URL
+    private String mPostUrl; // POST请求URL
+    private long mClientVersion; // 客户端版本号
+    private boolean mLoggedin; // 登录状态
+    private long mLastLoginTime; // 上次登录时间
+    private int mActionId; // 动作ID
+    private Account mAccount; // 当前账户信息
+    private JSONArray mUpdateArray; // 更新操作数组
+
+    // 私有构造函数，初始化GTaskClient实例
+    private GTaskClient() {
+        mHttpClient = null;
+        mGetUrl = GTASK_GET_URL; // 初始化GET请求URL
+        mPostUrl = GTASK_POST_URL; // 初始化POST请求URL
+        mClientVersion = -1; // 初始化客户端版本
+        mLoggedin = false; // 初始化未登录状态
+        mLastLoginTime = 0; // 初始化上次登录时间
+        mActionId = 1; // 初始化动作ID
+        mAccount = null; // 初始化账户信息
+        mUpdateArray = null; // 初始化更新数组
+    }
+
+    // 获取GTaskClient单例实例
+    public static synchronized GTaskClient getInstance() {
+        if (mInstance == null) {
+            mInstance = new GTaskClient(); // 创建新实例
+        }
+        return mInstance; // 返回单例实例
+    }
+
+    // 登录方法
+    public boolean login(Activity activity) {
+        // 假设cookie在5分钟后过期，需要重新登录
+        final long interval = 1000 * 60 * 5;
+        if (mLastLoginTime + interval < System.currentTimeMillis()) {
+            mLoggedin = false; // 登录过期
+        }
+
+        // 当账户切换时需要重新登录
+        if (mLoggedin && !TextUtils.equals(getSyncAccount().name, NotesPreferenceActivity.getSyncAccountName(activity))) {
+            mLoggedin = false; // 切换账户后未登录
+        }
+
+        if (mLoggedin) {
+            Log.d(TAG, "already logged in"); // 已经登录
+            return true; // 返回登录成功
+        }
+
+        mLastLoginTime = System.currentTimeMillis(); // 更新最后登录时间
+        String authToken = loginGoogleAccount(activity, false); // 登录Google账户
+        if (authToken == null) {
+            Log.e(TAG, "login google account failed"); // 登录失败
+            return false; // 返回登录失败
+        }
+
+        // 登录自定义域名
+        if (!(mAccount.name.toLowerCase().endsWith("gmail.com") || mAccount.name.toLowerCase().endsWith("googlemail.com"))) {
+            // 构建URL
+            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"; // 更新GET请求URL
+            mPostUrl = url.toString() + "r/ig"; // 更新POST请求URL
+
+            // 尝试以自定义域名登录
+            if (tryToLoginGtask(activity, authToken)) {
+                mLoggedin = true; // 登录成功
+            }
+        }
+
+        // 尝试使用Google官方URL登录
+        if (!mLoggedin) {
+            mGetUrl = GTASK_GET_URL; // 恢复默认GET请求URL
+            mPostUrl = GTASK_POST_URL; // 恢复默认POST请求URL
+            if (!tryToLoginGtask(activity, authToken)) { // 尝试登录
+                return false; // 登录失败
+            }
+        }
+
+        mLoggedin = true; // 登录状态更新
+        return true; // 返回登录成功
+    }
+
+    // 登录Google账户
+    private String loginGoogleAccount(Activity activity, boolean invalidateToken) {
+        String authToken; // 认证令牌
+        AccountManager accountManager = AccountManager.get(activity); // 获取账户管理器
+        Account[] accounts = accountManager.getAccountsByType("com.google"); // 获取Google账户
+
+        if (accounts.length == 0) {
+            Log.e(TAG, "there is no available google account"); // 没有可用的Google账户
+            return null; // 返回null
+        }
+
+        String accountName = NotesPreferenceActivity.getSyncAccountName(activity); // 获取预设的账户名
+        Account account = null;
+        for (Account a : accounts) {
+            if (a.name.equals(accountName)) { // 查找匹配的账户
+                account = a;
+                break;
+            }
+        }
+        if (account != null) {
+            mAccount = account; // 设置当前账户
+        } else {
+            Log.e(TAG, "unable to get an account with the same name in the settings"); // 未找到匹配的账户
+            return null; // 返回null
+        }
+
+        // 现在获取token
+        AccountManagerFuture<Bundle> accountManagerFuture = accountManager.getAuthToken(account, "goanna_mobile", null, activity, null, null); // 获取账户的认证令牌
+        try {
+            Bundle authTokenBundle = accountManagerFuture.getResult(); // 获取结果
+            authToken = authTokenBundle.getString(AccountManager.KEY_AUTHTOKEN); // 提取认证令牌
+            if (invalidateToken) {
+                accountManager.invalidateAuthToken("com.google", authToken); // 使令牌失效
+                loginGoogleAccount(activity, false); // 重新登录
+            }
+        } catch (Exception e) {
+            Log.e(TAG, "get auth token failed"); // 获取令牌失败
+            authToken = null; // 令牌为null
+        }
+
+        return authToken; // 返回认证令牌
+    }
+
+    // 尝试登录GTask
+    private boolean tryToLoginGtask(Activity activity, String authToken) {
+        if (!loginGtask(authToken)) { // 登录GTask
+            // 可能认证令牌过期，令牌失效后重试
+            authToken = loginGoogleAccount(activity, true); // 重新获取令牌
+            if (authToken == null) {
+                Log.e(TAG, "login google account failed"); // 登录失败
+                return false; // 返回失败
+            }
+
+            if (!loginGtask(authToken)) { // 重试登录GTask
+                Log.e(TAG, "login gtask failed"); // 登录GTask失败
+                return false; // 返回失败
+            }
+        }
+        return true; // 登录成功
+    }
+
+    // 登录GTask
+    private boolean loginGtask(String authToken) {
+        int timeoutConnection = 10000; // 连接超时设置
+        int timeoutSocket = 15000; // 套接字超时设置
+        HttpParams httpParameters = new BasicHttpParams(); // 创建HTTP参数
+        HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection); // 设置连接超时
+        HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket); // 设置套接字超时
+        mHttpClient = new DefaultHttpClient(httpParameters); // 初始化HTTP客户端
+        BasicCookieStore localBasicCookieStore = new BasicCookieStore(); // 初始化Cookie存储
+        mHttpClient.setCookieStore(localBasicCookieStore); // 设置Cookie存储
+        HttpProtocolParams.setUseExpectContinue(mHttpClient.getParams(), false); // 禁用ExpectContinue
+
+        // 登录GTask
+        try {
+            String loginUrl = mGetUrl + "?auth=" + authToken; // 构建登录URL
+            HttpGet httpGet = new HttpGet(loginUrl); // 创建GET请求
+            HttpResponse response = null;
+            response = mHttpClient.execute(httpGet); // 执行GET请求
+
+            // 获取Cookie
+            List<Cookie> cookies = mHttpClient.getCookieStore().getCookies(); // 获取当前Cookie
+            boolean hasAuthCookie = false;
+            for (Cookie cookie : cookies) {
+                if (cookie.getName().contains("GTL")) { // 检查是否存在授权Cookie
+                    hasAuthCookie = true;
+                }
+            }
+            if (!hasAuthCookie) {
+                Log.w(TAG, "it seems that there is no auth cookie"); // 授权Cookie不存在
+            }
+
+            // 获取客户端版本
+            String resString = getResponseContent(response.getEntity()); // 获取响应内容
+            String jsBegin = "_setup("; // JavaScript开始标识
+            String jsEnd = ")}</script>"; // JavaScript结束标识
+            int begin = resString.indexOf(jsBegin); // 查找开始索引
+            int end = resString.lastIndexOf(jsEnd); // 查找结束索引
+            String jsString = null;
+            if (begin != -1 && end != -1 && begin < end) { // 提取JavaScript内容
+                jsString = resString.substring(begin + jsBegin.length(), end);
+            }
+            JSONObject js = new JSONObject(jsString); // 创建JSON对象
+            mClientVersion = js.getLong("v"); // 获取客户端版本
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString()); // 记录JSON解析异常
+            e.printStackTrace(); // 打印异常堆栈
+            return false; // 返回失败
+        } catch (Exception e) {
+            // 捕获所有异常
+            Log.e(TAG, "httpget gtask_url failed"); // GET请求失败
+            return false; // 返回失败
+        }
+
+        return true; // 登录成功
+    }
+
+    // 获取下一个动作ID
+    private int getActionId() {
+        return mActionId++; // 返回并自增动作ID
+    }
+
+    // 创建HTTP POST请求
+    private HttpPost createHttpPost() {
+        HttpPost httpPost = new HttpPost(mPostUrl); // 创建POST请求
+        httpPost.setHeader("Content-Type", "application/x-www-form-urlencoded;charset=utf-8"); // 设置请求头
+        httpPost.setHeader("AT", "1"); // 设置自定义请求头
+        return httpPost; // 返回POST请求
+    }
+
+    // 获取响应内容
+    private String getResponseContent(HttpEntity entity) throws IOException {
+        String contentEncoding = null; // 内容编码
+        if (entity.getContentEncoding() != null) {
+            contentEncoding = entity.getContentEncoding().getValue(); // 获取编码类型
+            Log.d(TAG, "encoding: " + contentEncoding); // 记录编码类型
+        }
+
+        InputStream input = entity.getContent(); // 获取输入流
+        if (contentEncoding != null && contentEncoding.equalsIgnoreCase("gzip")) {
+            input = new GZIPInputStream(entity.getContent()); // 解压GZIP流
+        } else if (contentEncoding != null && contentEncoding.equalsIgnoreCase("deflate")) {
+            Inflater inflater = new Inflater(true); // 创建Inflater对象
+            input = new InflaterInputStream(entity.getContent(), inflater); // 解压DEFLATE流
+        }
+
+        try {
+            InputStreamReader isr = new InputStreamReader(input); // 创建输入流阅读器
+            BufferedReader br = new BufferedReader(isr); // 创建缓冲读取器
+            StringBuilder sb = new StringBuilder(); // 创建字符串构建器
+
+            while (true) {
+                String buff = br.readLine(); // 逐行读取
+                if (buff == null) {
+                    return sb.toString(); // 返回读取的内容
+                }
+                sb = sb.append(buff); // 将内容添加到构建器
+            }
+        } finally {
+            input.close(); // 关闭输入流
+        }
+    }
+
+    // POST请求方法
+    private JSONObject postRequest(JSONObject js) throws NetworkFailureException {
+        if (!mLoggedin) {
+            Log.e(TAG, "please login first"); // 未登录
+            throw new ActionFailureException("not logged in"); // 抛出异常
+        }
+
+        HttpPost httpPost = createHttpPost(); // 创建POST请求
+        try {
+            LinkedList<BasicNameValuePair> list = new LinkedList<BasicNameValuePair>(); // 创建参数列表
+            list.add(new BasicNameValuePair("r", js.toString())); // 添加请求参数
+            UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list, "UTF-8"); // 创建表单实体
+            httpPost.setEntity(entity); // 设置POST实体
+
+            // 执行POST请求
+            HttpResponse response = mHttpClient.execute(httpPost);
+            String jsString = getResponseContent(response.getEntity()); // 获取响应内容
+            return new JSONObject(jsString); // 返回JSON对象
+
+        } catch (ClientProtocolException e) {
+            Log.e(TAG, e.toString()); // 记录协议异常
+            e.printStackTrace(); // 打印异常堆栈
+            throw new NetworkFailureException("postRequest failed"); // 抛出网络失败异常
+        } catch (IOException e) {
+            Log.e(TAG, e.toString()); // 记录IO异常
+            e.printStackTrace(); // 打印异常堆栈
+            throw new NetworkFailureException("postRequest failed"); // 抛出网络失败异常
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString()); // 记录JSON异常
+            e.printStackTrace(); // 打印异常堆栈
+            throw new ActionFailureException("unable to convert response content to jsonobject"); // 抛出操作失败异常
+        } catch (Exception e) {
+            Log.e(TAG, e.toString()); // 记录其他异常
+            e.printStackTrace(); // 打印异常堆栈
+            throw new ActionFailureException("error occurs when posting request"); // 抛出操作失败异常
+        }
+    }
+
+    // 创建任务方法
+    public void createTask(Task task) throws NetworkFailureException {
+        commitUpdate(); // 提交更新
+        try {
+            JSONObject jsPost = new JSONObject(); // 创建JSON对象
+            JSONArray actionList = new JSONArray(); // 创建动作列表数组
+
+            // 添加创建动作到动作列表
+            actionList.put(task.getCreateAction(getActionId())); // 获取创建动作并添加
+            jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList); // 设置动作列表
+
+            // 设置客户端版本
+            jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
+
+            // 执行POST请求
+            JSONObject jsResponse = postRequest(jsPost);
+            JSONObject jsResult = (JSONObject) jsResponse.getJSONArray(GTaskStringUtils.GTASK_JSON_RESULTS).get(0); // 获取结果
+            task.setGid(jsResult.getString(GTaskStringUtils.GTASK_JSON_NEW_ID)); // 设置任务ID
+
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString()); // 记录JSON异常
+            e.printStackTrace(); // 打印异常堆栈
+            throw new ActionFailureException("create task: handing jsonobject failed"); // 抛出操作失败异常
+        }
+    }
+
+    // 创建任务列表方法
+    public void createTaskList(TaskList tasklist) throws NetworkFailureException {
+        commitUpdate(); // 提交更新
+        try {
+            JSONObject jsPost = new JSONObject(); // 创建JSON对象
+            JSONArray actionList = new JSONArray(); // 创建动作列表数组
+
+            // 添加创建动作到动作列表
+            actionList.put(tasklist.getCreateAction(getActionId())); // 获取创建动作并添加
+            jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList); // 设置动作列表
+
+            // 设置客户端版本
+            jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
+
+            // 执行POST请求
+            JSONObject jsResponse = postRequest(jsPost);
+            JSONObject jsResult = (JSONObject) jsResponse.getJSONArray(GTaskStringUtils.GTASK_JSON_RESULTS).get(0); // 获取结果
+            tasklist.setGid(jsResult.getString(GTaskStringUtils.GTASK_JSON_NEW_ID)); // 设置任务列表ID
+
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString()); // 记录JSON异常
+            e.printStackTrace(); // 打印异常堆栈
+            throw new ActionFailureException("create tasklist: handing jsonobject failed"); // 抛出操作失败异常
+        }
+    }
+
+    // 提交更新方法
+    public void commitUpdate() throws NetworkFailureException {
+        if (mUpdateArray != null) { // 如果有更新数组
+            try {
+                JSONObject jsPost = new JSONObject(); // 创建JSON对象
+
+                // 设置动作列表
+                jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, mUpdateArray);
+
+                // 设置客户端版本
+                jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
+
+                postRequest(jsPost); // 执行POST请求
+                mUpdateArray = null; // 清空更新数组
+            } catch (JSONException e) {
+                Log.e(TAG, e.toString()); // 记录JSON异常
+                e.printStackTrace(); // 打印异常堆栈
+                throw new ActionFailureException("commit update: handing jsonobject failed"); // 抛出操作失败异常
+            }
+        }
+    }
+
+    // 添加更新节点方法
+    public void addUpdateNode(Node node) throws NetworkFailureException {
+        if (node != null) { // 如果节点不为空
+            // 更新项目数量过多可能会导致错误，设置最大为10个
+            if (mUpdateArray != null && mUpdateArray.length() > 10) {
+                commitUpdate(); // 提交更新
+            }
+
+            if (mUpdateArray == null) // 如果更新数组为空
+                mUpdateArray = new JSONArray(); // 初始化更新数组
+            mUpdateArray.put(node.getUpdateAction(getActionId())); // 添加更新操作到数组
+        }
+    }
+
+    // 移动任务方法
+    public void moveTask(Task task, TaskList preParent, TaskList curParent) throws NetworkFailureException {
+        commitUpdate(); // 提交更新
+        try {
+            JSONObject jsPost = new JSONObject(); // 创建JSON对象
+            JSONArray actionList = new JSONArray(); // 创建动作列表
+            JSONObject action = new JSONObject(); // 创建动作对象
+
+            // 设置移动任务的动作
+            action.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE, GTaskStringUtils.GTASK_JSON_ACTION_TYPE_MOVE);
+            action.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, getActionId()); // 设置动作ID
+            action.put(GTaskStringUtils.GTASK_JSON_ID, task.getGid()); // 设置任务ID
+            if (preParent == curParent && task.getPriorSibling() != null) {
+                // 仅当在任务列表内移动且不是第一个时，设置前一个兄弟节点ID
+                action.put(GTaskStringUtils.GTASK_JSON_PRIOR_SIBLING_ID, task.getPriorSibling());
+            }
+            action.put(GTaskStringUtils.GTASK_JSON_SOURCE_LIST, preParent.getGid()); // 设置源列表ID
+            action.put(GTaskStringUtils.GTASK_JSON_DEST_PARENT, curParent.getGid()); // 设置目标父任务列表ID
+            if (preParent != curParent) {
+                // 仅当在不同任务列表间移动时，设置目标列表ID
+                action.put(GTaskStringUtils.GTASK_JSON_DEST_LIST, curParent.getGid());
+            }
+            actionList.put(action); // 将动作添加到动作列表
+            jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList); // 设置动作列表
+
+            // 设置客户端版本
+            jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
+
+            postRequest(jsPost); // 执行POST请求
+
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString()); // 记录JSON异常
+            e.printStackTrace(); // 打印异常堆栈
+            throw new ActionFailureException("move task: handing jsonobject failed"); // 抛出操作失败异常
+        }
+    }
+
+    // 删除节点方法
+    public void deleteNode(Node node) throws NetworkFailureException {
+        commitUpdate(); // 提交更新
+        try {
+            JSONObject jsPost = new JSONObject(); // 创建JSON对象
+            JSONArray actionList = new JSONArray(); // 创建动作列表
+
+            // 删除节点
+            node.setDeleted(true); // 设置节点为已删除
+            actionList.put(node.getUpdateAction(getActionId())); // 添加更新动作到列表
+            jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList); // 设置动作列表
+
+            // 设置客户端版本
+            jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
+
+            postRequest(jsPost); // 执行POST请求
+            mUpdateArray = null; // 清空更新数组
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString()); // 记录JSON异常
+            e.printStackTrace(); // 打印异常堆栈
+            throw new ActionFailureException("delete node: handing jsonobject failed"); // 抛出操作失败异常
+        }
+    }
+
+
+        // 获取任务列表的方法
+    public JSONArray getTaskLists() throws NetworkFailureException {
+        // 检查是否已登录
+        if (!mLoggedin) {
+            Log.e(TAG, "please login first"); // 记录错误日志
+            throw new ActionFailureException("not logged in"); // 抛出未登录异常
+        }
+
+        try {
+            HttpGet httpGet = new HttpGet(mGetUrl); // 创建GET请求
+            HttpResponse response = null; // 声明响应对象
+            response = mHttpClient.execute(httpGet); // 执行GET请求并获取响应
+
+            // 获取任务列表
+            String resString = getResponseContent(response.getEntity()); // 读取响应内容
+            String jsBegin = "_setup("; // JS数据开始标识
+            String jsEnd = ")}</script>"; // JS数据结束标识
+            int begin = resString.indexOf(jsBegin); // 查找开始索引
+            int end = resString.lastIndexOf(jsEnd); // 查找结束索引
+            String jsString = null; // 存储提取的JS字符串
+            if (begin != -1 && end != -1 && begin < end) { // 检查索引有效性
+                jsString = resString.substring(begin + jsBegin.length(), end); // 提取JS字符串
+            }
+            JSONObject js = new JSONObject(jsString); // 创建JSON对象
+            // 返回任务列表的JSONArray
+            return js.getJSONObject("t").getJSONArray(GTaskStringUtils.GTASK_JSON_LISTS);
+        } catch (ClientProtocolException e) {
+            Log.e(TAG, e.toString()); // 记录协议异常
+            e.printStackTrace(); // 打印异常堆栈
+            throw new NetworkFailureException("gettasklists: httpget failed"); // 抛出网络失败异常
+        } catch (IOException e) {
+            Log.e(TAG, e.toString()); // 记录IO异常
+            e.printStackTrace(); // 打印异常堆栈
+            throw new NetworkFailureException("gettasklists: httpget failed"); // 抛出网络失败异常
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString()); // 记录JSON异常
+            e.printStackTrace(); // 打印异常堆栈
+            throw new ActionFailureException("get task lists: handing jasonobject failed"); // 抛出操作失败异常
+        }
+    }
+
+    // 获取指定任务列表的任务方法
+    public JSONArray getTaskList(String listGid) throws NetworkFailureException {
+        commitUpdate(); // 提交更新操作
+        try {
+            JSONObject jsPost = new JSONObject(); // 创建JSON对象
+            JSONArray actionList = new JSONArray(); // 创建动作列表
+            JSONObject action = new JSONObject(); // 创建单个动作对象
+
+            // 设置动作列表
+            action.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE, GTaskStringUtils.GTASK_JSON_ACTION_TYPE_GETALL); // 动作类型为获取所有任务
+            action.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, getActionId()); // 设置动作ID
+            action.put(GTaskStringUtils.GTASK_JSON_LIST_ID, listGid); // 设置任务列表ID
+            action.put(GTaskStringUtils.GTASK_JSON_GET_DELETED, false); // 不获取已删除的任务
+            actionList.put(action); // 将动作添加到动作列表
+            jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList); // 设置动作列表到JSON对象
+
+            // 设置客户端版本
+            jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
+
+            JSONObject jsResponse = postRequest(jsPost); // 执行POST请求并获取响应
+            return jsResponse.getJSONArray(GTaskStringUtils.GTASK_JSON_TASKS); // 返回任务数组
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString()); // 记录JSON异常
+            e.printStackTrace(); // 打印异常堆栈
+            throw new ActionFailureException("get task list: handing jsonobject failed"); // 抛出操作失败异常
+        }
+    }
+
+    // 获取当前同步账户的方法
+    public Account getSyncAccount() {
+        return mAccount; // 返回当前账户信息
+    }
+
+    // 重置更新数组的方法
+    public void resetUpdateArray() {
+        mUpdateArray = null; // 将更新数组设置为null
+    }
+}
 
diff --git a/src/net/micode/notes/tool/ResourceParser.java b/src/net/micode/notes/tool/ResourceParser.java
index 0b475e9..f8853cf 100644
--- a/src/net/micode/notes/tool/ResourceParser.java
+++ b/src/net/micode/notes/tool/ResourceParser.java
@@ -28,11 +28,11 @@ import net.micode.notes.ui.NotesPreferenceActivity;
 public class ResourceParser {
 
     // 定义颜色常量
-    public static final int YELLOW           = 0;
-    public static final int BLUE             = 1;
-    public static final int WHITE            = 2;
-    public static final int GREEN            = 3;
-    public static final int RED              = 4;
+    public static final int YELLOW           = 0;//黄色为0
+    public static final int BLUE             = 1;//蓝色为1
+    public static final int WHITE            = 2;//白色为2
+    public static final int GREEN            = 3;//绿色为3
+    public static final int RED              = 4;//红色为4
 
     // 定义默认背景颜色常量
     public static final int BG_DEFAULT_COLOR = YELLOW;