Android uses Messenger to realize the interaction between service and activity

There are many ways to interact between service and activity. Here, let's talk about using Messenger to realize the interaction between them.

Service program:

public class MessengerService extends Service {

 final Messenger mMessenger = new Messenger(new IncomingHandler());
 @Override
 public IBinder onBind(Intent intent) {
  return mMessenger.getBinder();
 }

 @SuppressLint("HandlerLeak")
 class IncomingHandler extends Handler {

  @Override
  public void handleMessage(Message msg) {
   switch (msg.what) {
   case 0:
    Toast.makeText(MessengerService.this,"Hello lenve!", Toast.LENGTH_LONG).show();
    break;
   case 1:
    Toast.makeText(MessengerService.this,"Hello lenve!Hello world!", Toast.LENGTH_LONG).show();
    break;
   default:
    break;
   }
  }

 }
}

MainActivity.javaL:

public class MainActivity extends Activity {

 private Messenger mMessenger;
 private ServiceConnection conn;
 private Intent intent;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  intent = new Intent(this,MessengerService.class);
  conn = new ServiceConnection() {

   @Override
   public void onServiceDisconnected(ComponentName name) {
    mMessenger = null;
   }

   @Override
   public void onServiceConnected(ComponentName name, IBinder service) {
    mMessenger = new Messenger(service);
   }
  };
 }



 @Override
 protected void onStart() {
  super.onStart();
  bindService(intent, conn, BIND_AUTO_CREATE);
 }



 @Override
 protected void onStop() {
  super.onStop();
  unbindService(conn);
 }



 public void onClick(View v){
  Message msg = null;
  switch (v.getId()) {
  case R.id.button1:
   msg = Message.obtain(null, 0, 0, 0);
   try {
    mMessenger.send(msg);
   } catch (RemoteException e) {
    e.printStackTrace();
   }
   break;
  case R.id.Button01:
   msg = Message.obtain(null, 1, 0, 0);
   try {
    mMessenger.send(msg);
   } catch (RemoteException e) {
    e.printStackTrace();
   }
   break;
  default:
   break;
  }
 }
}

Original link: http://blog.csdn.net/u012702547/article/details/46989417

The above is the whole content of this article, hoping to help everyone learn Android software programming.