diff --git a/GTaskASyncTask.java b/GTaskASyncTask.java
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+++ b/GTaskASyncTask.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.remote包
+package net.micode.notes.remote;
+
+// 导入所需的Android类和接口
+import android.app.Notification;
+import android.app.NotificationManager;
+import android.app.PendingIntent;
+import android.content.Context;
+import android.content.Intent;
+import android.os.AsyncTask;
+
+// 导入应用内部的资源和类
+import net.micode.notes.R;
+import net.micode.notes.ui.NotesListActivity;
+import net.micode.notes.ui.NotesPreferenceActivity;
+
+// 定义GTaskASyncTask类，它继承自AsyncTask
+// 该类的参数分别为：参数类型Void，进度更新的参数类型String，返回结果的类型Integer
+public class GTaskASyncTask extends AsyncTask<Void, String, Integer> {
+
+    // 定义一个常量，用于通知的ID
+    private static int GTASK_SYNC_NOTIFICATION_ID = 5234235;
+
+    // 定义一个接口，用于在任务完成时回调
+    public interface OnCompleteListener {
+        void onComplete();
+    }
+
+    // 定义成员变量
+    private Context mContext; // Android上下文
+    private NotificationManager mNotifiManager; // 通知管理器
+    private GTaskManager mTaskManager; // 任务管理器
+    private OnCompleteListener mOnCompleteListener; // 完成时的回调接口
+
+    // 构造函数，接收上下文和完成时的回调接口
+    public GTaskASyncTask(Context context, OnCompleteListener listener) {
+        mContext = context;
+        mOnCompleteListener = listener;
+        mNotifiManager = (NotificationManager) mContext
+                .getSystemService(Context.NOTIFICATION_SERVICE); // 获取通知管理器
+        mTaskManager = GTaskManager.getInstance(); // 获取任务管理器的实例
+    }
+
+    // 取消同步的方法
+    public void cancelSync() {
+        mTaskManager.cancelSync();
+    }
+
+    // 发布进度更新的方法
+    public void publishProgess(String message) {
+        publishProgress(new String[] { message }); // 发布进度更新
+    }
+
+    // 显示通知的方法
+    private void showNotification(int tickerId, String content) {
+        // 创建通知对象
+        Notification notification = new Notification(R.drawable.notification, mContext
+                .getString(tickerId), System.currentTimeMillis());
+        notification.defaults = Notification.DEFAULT_LIGHTS; // 设置默认的灯光
+        notification.flags = Notification.FLAG_AUTO_CANCEL; // 设置通知自动取消
+
+        // 根据tickerId创建PendingIntent
+        PendingIntent pendingIntent;
+        if (tickerId != R.string.ticker_success) {
+            pendingIntent = PendingIntent.getActivity(mContext, 0, new Intent(mContext,
+                    NotesPreferenceActivity.class), 0);
+        } else {
+            pendingIntent = PendingIntent.getActivity(mContext, 0, new Intent(mContext,
+                    NotesListActivity.class), 0);
+        }
+
+        // 设置通知的详细信息
+        notification.setLatestEventInfo(mContext, mContext.getString(R.string.app_name), content,
+                pendingIntent);
+        // 发布通知
+        mNotifiManager.notify(GTASK_SYNC_NOTIFICATION_ID, notification);
+    }
+
+    // 后台任务执行的方法
+    @Override
+    protected Integer doInBackground(Void... unused) {
+        publishProgess(mContext.getString(R.string.sync_progress_login, NotesPreferenceActivity
+                .getSyncAccountName(mContext))); // 发布进度更新
+        return mTaskManager.sync(mContext, this); // 执行同步操作并返回结果
+    }
+
+    // 进度更新的方法
+    @Override
+    protected void onProgressUpdate(String... progress) {
+        showNotification(R.string.ticker_syncing, progress[0]); // 显示进度通知
+        if (mContext instanceof GTaskSyncService) {
+            ((GTaskSyncService) mContext).sendBroadcast(progress[0]); // 发送广播
+        }
+    }
+
+    // 任务执行完毕后的方法
+    @Override
+    protected void onPostExecute(Integer result) {
+        // 根据结果展示不同的通知
+        if (result == GTaskManager.STATE_SUCCESS) {
+            showNotification(R.string.ticker_success, mContext.getString(
+                    R.string.success_sync_account, mTaskManager.getSyncAccount()));
+            NotesPreferenceActivity.setLastSyncTime(mContext, System.currentTimeMillis());
+        } else if (result == GTaskManager.STATE_NETWORK_ERROR) {
+            showNotification(R.string.ticker_fail, mContext.getString(R.string.error_sync_network));
+        } else if (result == GTaskManager.STATE_INTERNAL_ERROR) {
+            showNotification(R.string.ticker_fail, mContext.getString(R.string.error_sync_internal));
+        } else if (result == GTaskManager.STATE_SYNC_CANCELLED) {
+            showNotification(R.string.ticker_cancel, mContext
+                    .getString(R.string.error_sync_cancelled));
+        }
+        // 如果设置了完成时的回调接口，则执行回调
+        if (mOnCompleteListener != null) {
+            new Thread(new Runnable() {
+                public void run() {
+                    mOnCompleteListener.onComplete();
+                }
+            }).start();
+        }
+    }
+}