service 中创建handler

 

/*** 用于接收从客户端传递过来的数据*/
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);}}
}/*** 创建Messenger并传入Handler实例对象*/
final Messenger mMessenger = new Messenger(new IncomingHandler());

/*** 当绑定Service时,该方法被调用,将通过mMessenger返回一个实现* IBinder接口的实例对象*/
@Override
public IBinder onBind(Intent intent) {Log.i(TAG, "Service is invoke onBind");return mMessenger.getBinder();
}

 

activity 中创建Messenger和ServiceConnection

 

 

/*** 与服务端交互的Messenger*/
Messenger mMessenger = null;/** Flag indicating whether we have called bind on the service. */
boolean mBound;/*** 实现与服务端链接的对象*/
private ServiceConnection mConnection = new ServiceConnection() {public void onServiceConnected(ComponentName className, IBinder service) {/*** 通过服务端传递的IBinder对象,创建相应的Messenger* 通过该Messenger对象与服务端进行交互*/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;}
};

开启service

 

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

activity 发送数据到service

 

public void sayHello(View v) {if (!mBound) return;// 创建与服务交互的消息实体MessageMessage msg = Message.obtain(null, 6, 0, 0);try {//发送消息mMessenger.send(msg);} catch (RemoteException e) {e.printStackTrace();}
}