service 中創建handler

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/*** 用于接收從客戶端傳遞過來的數據*/ class IncomingHandler extends Handler {@Overridepublic void handleMessage(Message msg) {switch (msg.what) {case 6:Log.i("map", "thanks,Service had receiver message from client!");break;default:super.handleMessage(msg);}} }/*** 創建Messenger并傳入Handler實例對象*/ final Messenger mMessenger = new Messenger(new IncomingHandler()); /*** 當綁定Service時,該方法被調用,將通過mMessenger返回一個實現* IBinder接口的實例對象*/ @Override public IBinder onBind(Intent intent) {Log.i(TAG, "Service is invoke onBind");return mMessenger.getBinder(); }

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activity 中創建Messenger和ServiceConnection

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/*** 與服務端交互的Messenger*/ Messenger mMessenger = null;/** Flag indicating whether we have called bind on the service. */ boolean mBound;/*** 實現與服務端鏈接的對象*/ private ServiceConnection mConnection = new ServiceConnection() {public void onServiceConnected(ComponentName className, IBinder service) {/*** 通過服務端傳遞的IBinder對象,創建相應的Messenger* 通過該Messenger對象與服務端進行交互*/mMessenger = new Messenger(service);mBound = true;}public void onServiceDisconnected(ComponentName className) {// This is called when the connection with the service has been// unexpectedly disconnected -- that is, its process crashed.mMessenger = null;mBound = false;} };

開啟service

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bindService(new Intent(MainActivity.this, ForegroundService.class), mConnection,Context.BIND_AUTO_CREATE);

activity 發送數據到service

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public void sayHello(View v) {if (!mBound) return;// 創建與服務交互的消息實體MessageMessage msg = Message.obtain(null, 6, 0, 0);try {//發送消息mMessenger.send(msg);} catch (RemoteException e) {e.printStackTrace();} }

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