不需要AIDL也不需要復雜的ContentProvider，也不需要SharedPreferences或者共享存儲文件！
只需要簡單易懂的Messenger，它也稱為信使，通過它可以在不同進程中傳遞message對象，在message中放入我們需要傳遞的數據你就可以實現跨進程通訊和傳遞數據。廢話不多說，直接上代碼。
首先是服務端：
public class Ser extends Service{@Overridepublic IBinder onBind(Intent intent) {return messenger.getBinder();}@Overridepublic int onStartCommand(Intent intent, int flags, int startId) {// TODO Auto-generated method stubLog.i("Service", "onStartCommand()");return super.onStartCommand(intent, flags, startId);}public Messenger messenger = new Messenger(new MyHandler());public class MyHandler extends Handler{@Overridepublic void handleMessage(Message msg) {Log.i("Ser---TAG", "msg::"+msg.arg1+"want :"+msg.getData().getString("msg"));Messenger messenger = msg.replyTo;Message message = Message.obtain(null, 0);Bundle bundle = new Bundle();bundle.putString("reply", "嗯,你的消息我已經收到,稍后回復你!");message.setData(bundle);try {messenger.send(message);} catch (RemoteException e) {e.printStackTrace();}super.handleMessage(msg);}}我們在服務端操作了并不多，僅僅是實例化了一個Messenger，并且創建了一個handler用來接收客戶端發送過來的消息
接下來看客戶端：
public class Client extends Service{private static final String TAG = "Client";protected Messenger mService;public Handler handler = new Handler(){public void handleMessage(Message msg) {Log.i("client --- TAG", "msg:;"+msg.getData().getString("reply"));};};public Messenger messenger = new Messenger(handler);@Overridepublic IBinder onBind(Intent intent) {return null;}@Overridepublic int onStartCommand(Intent intent, int flags, int startId) {Intent mIntent = new Intent();mIntent.setClassName("com.example.test1", "com.example.test1.Ser");bindService(mIntent, mBindService, Context.BIND_AUTO_CREATE);return super.onStartCommand(intent, flags, startId);}@Overridepublic void onDestroy() {super.onDestroy();unbindService(mBindService);}private ServiceConnection mBindService = new ServiceConnection(){@Overridepublic void onServiceConnected(ComponentName name, IBinder service) {mService = new Messenger(service);Message message = Message.obtain(null, 0);Bundle bundle = new Bundle();bundle.putString("msg", "hello this is client!");message.replyTo = messenger;message.setData(bundle);try {mService.send(message);} catch (RemoteException e) {e.printStackTrace();}}@Overridepublic void onServiceDisconnected(ComponentName name) {// TODO Auto-generated method stub}};}同樣客戶端也需要一個handler來接收服務端返回的消息，還有很關鍵的一點
當客戶端發送消息的時候，需要把接收服務端回復的Messenger通過Message的
replyTo參數傳遞給服務端，否則會報NullPointerException。然后我們在看下log
"hello this is client!" 這是客戶端發給服務端的，證明服務端已經收到！
"嗯,你的消息我已經收到,稍后回復你!" 這是服務端返回給客戶端的，證明客戶端也收到了，并且還是實時通訊哦,到此我們的跨進程傳遞數據通訊完整結束啦，是不是很簡單！
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