diff --git a/GTaskStringUtils.java b/GTaskStringUtils.java
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+++ b/GTaskStringUtils.java
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+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// 定义包名，表示这个类属于net.micode.notes.tool包
+package net.micode.notes.tool;
+
+// 声明一个公共类GTaskStringUtils
+public class GTaskStringUtils {
+
+    // 定义与GTasks JSON操作相关的常量
+    // action_id，用于标识操作的ID
+    public final static String GTASK_JSON_ACTION_ID = "action_id";
+    // action_list，用于标识操作涉及的任务列表
+    public final static String GTASK_JSON_ACTION_LIST = "action_list";
+    // action_type，用于标识操作类型
+    public final static String GTASK_JSON_ACTION_TYPE = "action_type";
+    // create，表示创建操作
+    public final static String GTASK_JSON_ACTION_TYPE_CREATE = "create";
+    // get_all，表示获取所有操作
+    public final static String GTASK_JSON_ACTION_TYPE_GETALL = "get_all";
+    // move，表示移动操作
+    public final static String GTASK_JSON_ACTION_TYPE_MOVE = "move";
+    // update，表示更新操作
+    public final static String GTASK_JSON_ACTION_TYPE_UPDATE = "update";
+
+    // 定义与GTasks实体相关的常量
+    // creator_id，用于标识创建者的ID
+    public final static String GTASK_JSON_CREATOR_ID = "creator_id";
+    // child_entity，用于标识子实体
+    public final static String GTASK_JSON_CHILD_ENTITY = "child_entity";
+    // client_version，用于标识客户端版本
+    public final static String GTASK_JSON_CLIENT_VERSION = "client_version";
+    // completed，用于标识任务是否完成
+    public final static String GTASK_JSON_COMPLETED = "completed";
+    // current_list_id，用于标识当前任务所在的列表ID
+    public final static String GTASK_JSON_CURRENT_LIST_ID = "current_list_id";
+    // default_list_id，用于标识默认任务列表的ID
+    public final static String GTASK_JSON_DEFAULT_LIST_ID = "default_list_id";
+    // deleted，用于标识任务是否被删除
+    public final static String GTASK_JSON_DELETED = "deleted";
+    // dest_list，用于标识目标列表
+    public final static String GTASK_JSON_DEST_LIST = "dest_list";
+    // dest_parent，用于标识目标父级
+    public final static String GTASK_JSON_DEST_PARENT = "dest_parent";
+    // dest_parent_type，用于标识目标父级类型
+    public final static String GTASK_JSON_DEST_PARENT_TYPE = "dest_parent_type";
+    // entity_delta，用于标识实体变化
+    public final static String GTASK_JSON_ENTITY_DELTA = "entity_delta";
+    // entity_type，用于标识实体类型
+    public final static String GTASK_JSON_ENTITY_TYPE = "entity_type";
+    // get_deleted，用于标识是否获取已删除的任务
+    public final static String GTASK_JSON_GET_DELETED = "get_deleted";
+    // id，用于标识实体的ID
+    public final static String GTASK_JSON_ID = "id";
+    // index，用于标识索引
+    public final static String GTASK_JSON_INDEX = "index";
+    // last_modified，用于标识最后一次修改时间
+    public final static String GTASK_JSON_LAST_MODIFIED = "last_modified";
+    // latest_sync_point，用于标识最新的同步点
+    public final static String GTASK_JSON_LATEST_SYNC_POINT = "latest_sync_point";
+    // list_id，用于标识列表ID
+    public final static String GTASK_JSON_LIST_ID = "list_id";
+    // lists，用于标识列表集合
+    public final static String GTASK_JSON_LISTS = "lists";
+    // name，用于标识名称
+    public final static String GTASK_JSON_NAME = "name";
+    // new_id，用于标识新ID
+    public final static String GTASK_JSON_NEW_ID = "new_id";
+    // notes，用于标识笔记
+    public final static String GTASK_JSON_NOTES = "notes";
+    // parent_id，用于标识父级ID
+    public final static String GTASK_JSON_PARENT_ID = "parent_id";
+    // prior_sibling_id，用于标识前一个同级ID
+    public final static String GTASK_JSON_PRIOR_SIBLING_ID = "prior_sibling_id";
+    // results，用于标识结果集合
+    public final static String GTASK_JSON_RESULTS = "results";
+    // source_list，用于标识源列表
+    public final static String GTASK_JSON_SOURCE_LIST = "source_list";
+    // tasks，用于标识任务集合
+    public final static String GTASK_JSON_TASKS = "tasks";
+    // type，用于标识类型
+    public final static String GTASK_JSON_TYPE = "type";
+    // GROUP，表示组类型
+    public final static String GTASK_JSON_TYPE_GROUP = "GROUP";
+    // TASK，表示任务类型
+    public final static String GTASK_JSON_TYPE_TASK = "TASK";
+    // user，用于标识用户
+    public final static String GTASK_JSON_USER = "user";
+
+    // 定义与文件夹相关的常量
+    // [MIUI_Notes]，表示MIUI笔记文件夹的前缀
+    public final static String MIUI_FOLDER_PREFFIX = "[MIUI_Notes]";
+    // Default，表示默认文件夹名
+    public final static String FOLDER_DEFAULT = "Default";
+    // Call_Note，表示通话记录文件夹名
+    public final static String FOLDER_CALL_NOTE = "Call_Note";
+    // METADATA，表示元数据文件夹名
+    public final static String FOLDER_META = "METADATA";
+
+    // 定义与元数据相关的常量
+    // meta_gid，用于标识元数据中的GTasks ID
+    public final static String META_HEAD_GTASK_ID = "meta_gid";
+    // meta_note，用于标识元数据中的笔记
+    public final static String META_HEAD_NOTE = "meta_note";
+    // meta_data，用于标识元数据中的数据
+    public final static String META_HEAD_DATA = "meta_data";
+
+    // [META INFO] DON'T UPDATE AND DELETE，表示元数据笔记的名称，提示用户不要更新和删除
+    public final static String META_NOTE_NAME = "[META INFO] DON'T UPDATE AND DELETE";
+}