diff --git a/java/net/micode/notes/gtask/remote/GTaskASyncTask.java b/java/net/micode/notes/gtask/remote/GTaskASyncTask.java
index 2d3861d..b570a88 100644
--- a/java/net/micode/notes/gtask/remote/GTaskASyncTask.java
+++ b/java/net/micode/notes/gtask/remote/GTaskASyncTask.java
@@ -31,20 +31,22 @@ import net.micode.notes.ui.NotesPreferenceActivity;
 
 public class GTaskASyncTask extends AsyncTask<Void, String, Integer> {
 
-    private static int GTASK_SYNC_NOTIFICATION_ID = 5234235;
+    private static int GTASK_SYNC_NOTIFICATION_ID = 5234235;// 同步通知的唯一ID
 
+  	// 完成监听器接口
     public interface OnCompleteListener {
         void onComplete();
     }
 
-    private Context mContext;
+    private Context mContext;  // 应用上下文
 
-    private NotificationManager mNotifiManager;
+    private NotificationManager mNotifiManager;  // 通知管理器
 
-    private GTaskManager mTaskManager;
+    private GTaskManager mTaskManager;  // Google Tasks管理器
 
-    private OnCompleteListener mOnCompleteListener;
+    private OnCompleteListener mOnCompleteListener;  // 完成监听器
 
+    // 构造函数
     public GTaskASyncTask(Context context, OnCompleteListener listener) {
         mContext = context;
         mOnCompleteListener = listener;
@@ -53,10 +55,11 @@ public class GTaskASyncTask extends AsyncTask<Void, String, Integer> {
         mTaskManager = GTaskManager.getInstance();
     }
 
+	// 取消同步操作
     public void cancelSync() {
         mTaskManager.cancelSync();
     }
-
+	// 发布进度信息
     public void publishProgess(String message) {
         publishProgress(new String[] {
             message
@@ -81,6 +84,8 @@ public class GTaskASyncTask extends AsyncTask<Void, String, Integer> {
           //      pendingIntent);
         //mNotifiManager.notify(GTASK_SYNC_NOTIFICATION_ID, notification);
     //}
+    
+     // 显示通知
 private void showNotification(int tickerId, String content) {
     PendingIntent pendingIntent;
     if (tickerId != R.string.ticker_success) {
@@ -100,7 +105,8 @@ private void showNotification(int tickerId, String content) {
     Notification notification=builder.getNotification();
     mNotifiManager.notify(GTASK_SYNC_NOTIFICATION_ID, notification);
 }
-
+	
+	// 在后台线程执行同步操作
     @Override
     protected Integer doInBackground(Void... unused) {
         publishProgess(mContext.getString(R.string.sync_progress_login, NotesPreferenceActivity
@@ -108,6 +114,7 @@ private void showNotification(int tickerId, String content) {
         return mTaskManager.sync(mContext, this);
     }
 
+	 // 更新UI线程中的进度
     @Override
     protected void onProgressUpdate(String... progress) {
         showNotification(R.string.ticker_syncing, progress[0]);
@@ -115,7 +122,8 @@ private void showNotification(int tickerId, String content) {
             ((GTaskSyncService) mContext).sendBroadcast(progress[0]);
         }
     }
-
+	
+	// 同步完成后在UI线程执行
     @Override
     protected void onPostExecute(Integer result) {
         if (result == GTaskManager.STATE_SUCCESS) {
@@ -130,6 +138,7 @@ private void showNotification(int tickerId, String content) {
             showNotification(R.string.ticker_cancel, mContext
                     .getString(R.string.error_sync_cancelled));
         }
+      // 调用完成监听器
         if (mOnCompleteListener != null) {
             new Thread(new Runnable() {