diff --git a/java/net/micode/notes/gtask/remote/GTaskClient.java b/java/net/micode/notes/gtask/remote/GTaskClient.java
index c67dfdf..d8ddc99 100644
--- a/java/net/micode/notes/gtask/remote/GTaskClient.java
+++ b/java/net/micode/notes/gtask/remote/GTaskClient.java
@@ -65,31 +65,22 @@ public class GTaskClient {
     private static final String TAG = GTaskClient.class.getSimpleName();
 
     private static final String GTASK_URL = "https://mail.google.com/tasks/";
-
     private static final String GTASK_GET_URL = "https://mail.google.com/tasks/ig";
-
     private static final String GTASK_POST_URL = "https://mail.google.com/tasks/r/ig";
 
-    private static GTaskClient mInstance = null;
-
-    private DefaultHttpClient mHttpClient;
-
-    private String mGetUrl;
-
-    private String mPostUrl;
-
-    private long mClientVersion;
-
-    private boolean mLoggedin;
-
-    private long mLastLoginTime;
-
-    private int mActionId;
-
-    private Account mAccount;
+   private static GTaskClient mInstance = null;  // 单例实例
 
-    private JSONArray mUpdateArray;
+    private DefaultHttpClient mHttpClient;  // HTTP客户端
+    private String mGetUrl;  // GET请求URL
+    private String mPostUrl;  // POST请求URL
+    private long mClientVersion;  // 客户端版本号
+    private boolean mLoggedin;  // 登录状态
+    private long mLastLoginTime;  // 最后登录时间
+    private int mActionId;  // 操作ID
+    private Account mAccount;  // 当前账户
+    private JSONArray mUpdateArray;  // 更新操作数组
 
+	// 私有构造函数，实现单例模式
     private GTaskClient() {
         mHttpClient = null;
         mGetUrl = GTASK_GET_URL;
@@ -102,6 +93,7 @@ public class GTaskClient {
         mUpdateArray = null;
     }
 
+	 // 获取单例实例
     public static synchronized GTaskClient getInstance() {
         if (mInstance == null) {
             mInstance = new GTaskClient();
@@ -109,15 +101,18 @@ public class GTaskClient {
         return mInstance;
     }
 
+	// 登录Google账户
     public boolean login(Activity activity) {
         // we suppose that the cookie would expire after 5 minutes
         // then we need to re-login
+      	// 检查是否需要重新登录（5分钟过期或账户切换）
         final long interval = 1000 * 60 * 5;
         if (mLastLoginTime + interval < System.currentTimeMillis()) {
             mLoggedin = false;
         }
 
         // need to re-login after account switch
+      // 账户切换时需要重新登录
         if (mLoggedin
                 && !TextUtils.equals(getSyncAccount().name, NotesPreferenceActivity
                         .getSyncAccountName(activity))) {
@@ -137,6 +132,7 @@ public class GTaskClient {
         }
 
         // login with custom domain if necessary
+      	// 处理自定义域名账户
         if (!(mAccount.name.toLowerCase().endsWith("gmail.com") || mAccount.name.toLowerCase()
                 .endsWith("googlemail.com"))) {
             StringBuilder url = new StringBuilder(GTASK_URL).append("a/");
@@ -152,6 +148,7 @@ public class GTaskClient {
         }
 
         // 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;
@@ -164,6 +161,7 @@ public class GTaskClient {
         return true;
     }
 
+    // 登录Google账户并获取认证令牌
     private String loginGoogleAccount(Activity activity, boolean invalidateToken) {
         String authToken;
         AccountManager accountManager = AccountManager.get(activity);
@@ -174,6 +172,7 @@ public class GTaskClient {
             return null;
         }
 
+      // 获取同步账户
         String accountName = NotesPreferenceActivity.getSyncAccountName(activity);
         Account account = null;
         for (Account a : accounts) {
@@ -190,6 +189,7 @@ public class GTaskClient {
         }
 
         // get the token now
+      // 获取认证令牌
         AccountManagerFuture<Bundle> accountManagerFuture = accountManager.getAuthToken(account,
                 "goanna_mobile", null, activity, null, null);
         try {
@@ -207,10 +207,12 @@ public class GTaskClient {
         return authToken;
     }
 
+	  // 尝试登录Google Tasks
     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
+          // 认证令牌可能过期，使令牌失效并重新尝试
             authToken = loginGoogleAccount(activity, true);
             if (authToken == null) {
                 Log.e(TAG, "login google account failed");
@@ -225,7 +227,9 @@ public class GTaskClient {
         return true;
     }
 
+	// 登录Google Tasks服务
     private boolean loginGtask(String authToken) {
+       // 设置HTTP客户端参数
         int timeoutConnection = 10000;
         int timeoutSocket = 15000;
         HttpParams httpParameters = new BasicHttpParams();
@@ -237,6 +241,7 @@ public class GTaskClient {
         HttpProtocolParams.setUseExpectContinue(mHttpClient.getParams(), false);
 
         // login gtask
+       // 登录Google Tasks
         try {
             String loginUrl = mGetUrl + "?auth=" + authToken;
             HttpGet httpGet = new HttpGet(loginUrl);
@@ -244,6 +249,7 @@ public class GTaskClient {
             response = mHttpClient.execute(httpGet);
 
             // get the cookie now
+           // 检查认证Cookie
             List<Cookie> cookies = mHttpClient.getCookieStore().getCookies();
             boolean hasAuthCookie = false;
             for (Cookie cookie : cookies) {
@@ -256,6 +262,7 @@ public class GTaskClient {
             }
 
             // get the client version
+          // 获取客户端版本
             String resString = getResponseContent(response.getEntity());
             String jsBegin = "_setup(";
             String jsEnd = ")}</script>";
@@ -280,10 +287,12 @@ public class GTaskClient {
         return true;
     }
 
+	// 获取操作ID
     private int getActionId() {
         return mActionId++;
     }
 
+	// 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");
@@ -291,6 +300,7 @@ public class GTaskClient {
         return httpPost;
     }
 
+	// 处理HTTP响应内容
     private String getResponseContent(HttpEntity entity) throws IOException {
         String contentEncoding = null;
         if (entity.getContentEncoding() != null) {
@@ -298,6 +308,7 @@ public class GTaskClient {
             Log.d(TAG, "encoding: " + contentEncoding);
         }
 
+      // 处理压缩响应
         InputStream input = entity.getContent();
         if (contentEncoding != null && contentEncoding.equalsIgnoreCase("gzip")) {
             input = new GZIPInputStream(entity.getContent());
@@ -323,6 +334,7 @@ public class GTaskClient {
         }
     }
 
+	// 发送POST请求
     private JSONObject postRequest(JSONObject js) throws NetworkFailureException {
         if (!mLoggedin) {
             Log.e(TAG, "please login first");
@@ -337,6 +349,7 @@ public class GTaskClient {
             httpPost.setEntity(entity);
 
             // execute the post
+          // 执行POST请求
             HttpResponse response = mHttpClient.execute(httpPost);
             String jsString = getResponseContent(response.getEntity());
             return new JSONObject(jsString);
@@ -360,6 +373,7 @@ public class GTaskClient {
         }
     }
 
+	// 创建任务
     public void createTask(Task task) throws NetworkFailureException {
         commitUpdate();
         try {
@@ -367,6 +381,7 @@ public class GTaskClient {
             JSONArray actionList = new JSONArray();
 
             // action_list
+          // 添加创建任务的操作
             actionList.put(task.getCreateAction(getActionId()));
             jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList);
 
@@ -374,6 +389,7 @@ public class GTaskClient {
             jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
 
             // post
+          // 发送请求并获取新任务ID
             JSONObject jsResponse = postRequest(jsPost);
             JSONObject jsResult = (JSONObject) jsResponse.getJSONArray(
                     GTaskStringUtils.GTASK_JSON_RESULTS).get(0);
@@ -386,6 +402,7 @@ public class GTaskClient {
         }
     }
 
+	// 创建任务列表
     public void createTaskList(TaskList tasklist) throws NetworkFailureException {
         commitUpdate();
         try {
@@ -393,6 +410,7 @@ public class GTaskClient {
             JSONArray actionList = new JSONArray();
 
             // action_list
+           // 添加创建任务列表的操作
             actionList.put(tasklist.getCreateAction(getActionId()));
             jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList);
 
@@ -400,6 +418,7 @@ public class GTaskClient {
             jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
 
             // post
+           // 发送请求并获取新任务列表ID
             JSONObject jsResponse = postRequest(jsPost);
             JSONObject jsResult = (JSONObject) jsResponse.getJSONArray(
                     GTaskStringUtils.GTASK_JSON_RESULTS).get(0);
@@ -412,6 +431,7 @@ public class GTaskClient {
         }
     }
 
+	 // 提交更新操作
     public void commitUpdate() throws NetworkFailureException {
         if (mUpdateArray != null) {
             try {
@@ -433,10 +453,12 @@ public class GTaskClient {
         }
     }
 
+	// 添加更新节点
     public void addUpdateNode(Node node) throws NetworkFailureException {
         if (node != null) {
             // too many update items may result in an error
             // set max to 10 items
+           // 批量操作限制，超过10个项目时提交更新
             if (mUpdateArray != null && mUpdateArray.length() > 10) {
                 commitUpdate();
             }
@@ -447,6 +469,8 @@ public class GTaskClient {
         }
     }
 
+	
+    // 移动任务
     public void moveTask(Task task, TaskList preParent, TaskList curParent)
             throws NetworkFailureException {
         commitUpdate();
@@ -456,10 +480,12 @@ public class GTaskClient {
             JSONObject action = new JSONObject();
 
             // action_list
+          // 创建移动任务的操作
             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());
+          // 设置前置兄弟任务ID，如果在同一任务列表中移动且不是第一个任务
             if (preParent == curParent && task.getPriorSibling() != null) {
                 // put prioring_sibing_id only if moving within the tasklist and
                 // it is not the first one
@@ -467,6 +493,8 @@ public class GTaskClient {
             }
             action.put(GTaskStringUtils.GTASK_JSON_SOURCE_LIST, preParent.getGid());
             action.put(GTaskStringUtils.GTASK_JSON_DEST_PARENT, curParent.getGid());
+          
+          // 设置目标任务列表ID（如果在不同任务列表之间移动）
             if (preParent != curParent) {
                 // put the dest_list only if moving between tasklists
                 action.put(GTaskStringUtils.GTASK_JSON_DEST_LIST, curParent.getGid());
@@ -486,6 +514,7 @@ public class GTaskClient {
         }
     }
 
+	// 删除节点
     public void deleteNode(Node node) throws NetworkFailureException {
         commitUpdate();
         try {
@@ -493,6 +522,7 @@ public class GTaskClient {
             JSONArray actionList = new JSONArray();
 
             // action_list
+            // 设置节点为已删除并添加更新操作
             node.setDeleted(true);
             actionList.put(node.getUpdateAction(getActionId()));
             jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList);
@@ -509,6 +539,7 @@ public class GTaskClient {
         }
     }
 
+	 // 获取任务列表
     public JSONArray getTaskLists() throws NetworkFailureException {
         if (!mLoggedin) {
             Log.e(TAG, "please login first");
@@ -521,6 +552,7 @@ public class GTaskClient {
             response = mHttpClient.execute(httpGet);
 
             // get the task list
+           // 解析响应内容获取任务列表
             String resString = getResponseContent(response.getEntity());
             String jsBegin = "_setup(";
             String jsEnd = ")}</script>";
@@ -547,6 +579,7 @@ public class GTaskClient {
         }
     }
 
+	// 获取特定任务列表中的任务
     public JSONArray getTaskList(String listGid) throws NetworkFailureException {
         commitUpdate();
         try {
@@ -555,6 +588,7 @@ public class GTaskClient {
             JSONObject action = new JSONObject();
 
             // action_list
+          // 创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());
@@ -575,10 +609,12 @@ public class GTaskClient {
         }
     }
 
+	 // 获取同步账户
     public Account getSyncAccount() {
         return mAccount;
     }
 
+	  // 重置更新数组
     public void resetUpdateArray() {
         mUpdateArray = null;
     }