foursquare -6 Handler

 

        // Sometimes we want the application to do some work on behalf of the        // Activity. Lets do that        // asynchronously.        mTaskThread = new HandlerThread(TAG + "-AsyncThread"); //初始化LOOP， run 方法中prepare（），调用LOOP 的 loop()        //Loop  循环分发处理消息         mTaskThread.start();        mTaskHandler = new TaskHandler(mTaskThread.getLooper());

handler 定义

    private class TaskHandler extends Handler {        private static final int MESSAGE_UPDATE_USER = 1;        private static final int MESSAGE_START_SERVICE = 2;        public TaskHandler(Looper looper) {            super(looper);        }        @Override        public void handleMessage(Message msg) {//消息处理            super.handleMessage(msg);            if (DEBUG) Log.d(TAG, "handleMessage: " + msg.what);            switch (msg.what) {                case MESSAGE_UPDATE_USER:

                    ............................                    return;                case MESSAGE_START_SERVICE:                    Intent serviceIntent = new Intent(Foursquared.this, FoursquaredService.class);                    serviceIntent.setAction(AppWidgetManager.ACTION_APPWIDGET_UPDATE);                    startService(serviceIntent);                    return;            }        }    }

调用方法

    public void requestStartService() {        mTaskHandler.sendMessage( //把消息放到队列中                mTaskHandler.obtainMessage(TaskHandler.MESSAGE_START_SERVICE) );//生成消息    }    public void requestUpdateUser() {        mTaskHandler.sendEmptyMessage(TaskHandler.MESSAGE_UPDATE_USER);    }