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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.
+ */
+
+// 声明包名
+package net.micode.notes.gtask.remote;
+ 
+// 导入所需的Android类和接口
+import android.app.Notification; // 通知类
+import android.app.NotificationManager; // 通知管理类
+import android.app.PendingIntent; // 意图的延迟执行类
+import android.content.Context; // 上下文类
+import android.content.Intent; // 意图类
+import android.os.AsyncTask; // 异步任务类
+ 
+// 导入项目内部的其他类
+import net.micode.notes.R; // 资源类
+import net.micode.notes.ui.NotesListActivity; // 笔记列表活动
+import net.micode.notes.ui.NotesPreferenceActivity; // 笔记偏好设置活动
+ 
+// 定义一个继承自AsyncTask的类，用于执行后台任务
+public class GTaskASyncTask extends AsyncTask<Void, String, Integer> {
+	 // 定义通知ID
+    private static int GTASK_SYNC_NOTIFICATION_ID = 5234235;
+ // 定义一个接口，用于任务完成时的回调
+    public interface OnCompleteListener {
+        void onComplete();
+    }
+ // 声明成员变量
+    private Context mContext; // 上下文
+    private NotificationManager mNotifiManager; // 通知管理器
+    private GTaskManager mTaskManager; // 任务管理器
+    private OnCompleteListener mOnCompleteListener; // 任务完成监听器
+ 
+    // 构造函数，初始化成员变量
+    public GTaskASyncTask(Context context, OnCompleteListener listener) {
+        mContext = context;
+        mOnCompleteListener = listener;
+        mNotifiManager = (NotificationManager) mContext
+                .getSystemService(Context.NOTIFICATION_SERVICE);// 获取通知服务
+        mTaskManager = GTaskManager.getInstance();// 获取任务管理器实例
+    }
+ // 取消同步的方法
+    public void cancelSync() {
+        mTaskManager.cancelSync();
+    }
+ // 发布进度的方法，注意这里重写了publishProgress方法
+    public void publishProgess(String message) {
+        publishProgress(new String[] {
+            message
+        });
+    }
+ // 显示通知的方法
+    private void showNotification(int tickerId, String content) {
+    	// 创建通知
+        Notification notification = new Notification(R.drawable.notification, mContext
+                .getString(tickerId), System.currentTimeMillis());
+        notification.defaults = Notification.DEFAULT_LIGHTS; // 设置默认灯光
+        notification.flags = Notification.FLAG_AUTO_CANCEL;// 设置自动取消
+        PendingIntent pendingIntent;// 延迟意图
+        // 根据tickerId判断点击通知后的跳转页面
+        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);
+     // 发送通知
+        mNotifiManager.notify(GTASK_SYNC_NOTIFICATION_ID, notification);
+    }
+ // 在后台线程中执行的任务
+    @Override
+    protected Integer doInBackground(Void... unused) {
+    	// 发布登录进度的通知
+        publishProgess(mContext.getString(R.string.sync_progress_login, NotesPreferenceActivity
+                .getSyncAccountName(mContext)));
+     // 执行同步任务，并返回结果
+        return mTaskManager.sync(mContext, this);
+    }
+ // 更新进度的方法
+    @Override
+    protected void onProgressUpdate(String... progress) {
+    	// 显示同步中的通知
+        showNotification(R.string.ticker_syncing, progress[0]);
+     // 如果上下文是GTaskSyncService的实例，则发送广播
+        if (mContext instanceof GTaskSyncService) {
+            ((GTaskSyncService) mContext).sendBroadcast(progress[0]);
+        }
+    }
+    // 任务执行完成后的方法
+    @Override
+    protected void onPostExecute(Integer result) {
+    	// 根据结果显示不同的通知
+        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));
+        }
+     // 如果设置了任务完成监听器，则在新线程中调用其onComplete方法
+        if (mOnCompleteListener != null) {
+            new Thread(new Runnable() {
+
+                public void run() {
+                    mOnCompleteListener.onComplete();
+                }
+            }).start();
+        }
+    }
+}