Cross process two-way communication using messenger

Messenger ： messenger

1. Client side usage Activity

private Messenger messenger;// messenger 
// Handle messages from the server 
    Handler handler = new Handler(){
        @Override
        public void handleMessage(@NonNull Message msg) {
            super.handleMessage(msg);
            switch (msg.what) {
                case MessagerService.MSG:
                    Log.e("TAG"," Received a response from the server ："+msg.getData().getString("msg"));
                    break;
            }
        }
    };

 @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
           // Binding server 
        Intent intent = new Intent(this,MessagerService.class);
        bindService(intent,connection,BIND_AUTO_CREATE);
    }

  private ServiceConnection connection = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            // establish   Messenger from client to server 
            messenger = new Messenger(service);
            Message message = Message.obtain(null,MessagerService.MSG);
            Bundle bundle = new Bundle();
            bundle.putString("msg"," Client message ： Hello   Server side ");
            message.setData(bundle);
            // take messenger  Pass it to the server    Create a server to client messenger 
            message.replyTo = new Messenger(handler);
            try {
                 // Send message to server 
                messenger.send(message);
            } catch (RemoteException e) {
                e.printStackTrace();
            }
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {

        }
    };

2. Server use service

public static final int MSG = 1;
    public Handler handler = new Handler(){
        @SuppressLint("HandlerLeak")
        @Override
        public void handleMessage(@NonNull Message msg) {
            super.handleMessage(msg);
            switch (msg.what) {
                case MSG:
                    Log.e("TAG",msg.getData().getString("msg"));
                    Log.e("TAG"," Received client message ");
                    // Get the client's Messenger object 
                    Messenger messenger = msg.replyTo;
                    Message message = Message.obtain(null,MessagerService.MSG);
                    Bundle bundle = new Bundle();
                    bundle.putString("msg"," Hello, client , I've got the message ");
                    message.setData(bundle);
                    try {
                        messenger.send(message);
                    } catch (RemoteException e) {
                        e.printStackTrace();
                    }
                    break;
            }
        }
    };

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return new Messenger(handler).getBinder();
    }

3.manifest in

<service android:name=".MessagerService" android:process=":remote"/>

bring activity and service Not in a thread