Search This Blog

Support my cause by downloading

Wednesday, 20 February 2013

Binding service using Messenger in android

Binding service using Messanger is another way. Here we discussed bounding service using iBinder. This current post address the issue of bounding service using Messanger
When to use Messanger Approach
If you need your service to communicate with remote processes, then you can use a Messenger to provide the interface for your service. This technique allows you to perform interprocess communication (IPC) without the need to use AIDL.

Create one Class and extend Service. Register this inside android manifest.
Not make necessary changes to your service class. Create one handler class for Messanger. Handler class will handle communication with Activity.

 import android.app.Service;  
 import android.content.Intent;  
 import android.os.Handler;  
 import android.os.IBinder;  
 import android.os.Message;  
 import android.os.Messenger;  
 import android.widget.Toast;  
 public class UsingMessanger extends Service {  
 final public static int Msg = 1;  
 @Override  
 public void onCreate() {  
 super.onCreate();  
 }  
 @Override  
 public IBinder onBind(Intent arg0) {  
 Messenger mssMessenger = new Messenger(new HandlerMessag());  
 return mssMessenger.getBinder();  
 }  
 public class HandlerMessag extends Handler {  
 @Override  
 public void handleMessage(Message msg) {  
 switch (msg.what) {  
 case Msg:  
 Toast.makeText(getApplicationContext(), "Service: I got your message",  
 Toast.LENGTH_SHORT).show();  
 break;  
 default:  
 super.handleMessage(msg);  
 }  
 }  
 }  
 }  
Now change the activity to handle Service connection.
 import android.app.Activity;  
 import android.content.ComponentName;  
 import android.content.Context;  
 import android.content.Intent;  
 import android.content.ServiceConnection;  
 import android.os.Bundle;  
 import android.os.IBinder;  
 import android.os.Message;  
 import android.os.Messenger;  
 import android.os.RemoteException;  
 public class MessangerActivity extends Activity {  
 Messenger messenger;  
 @Override  
 protected void onCreate(Bundle savedInstanceState) {  
 super.onCreate(savedInstanceState);  
 bindService();  
 }  
 public void bindService() {  
 Intent intent = new Intent(this, UsingMessanger.class);  
 bindService(intent, new ConnectService(), Context.BIND_AUTO_CREATE);  
 }  
 public void stoppingService() {  
 Intent intent = new Intent(this, UsingMessanger.class);  
 stopService(intent);  
 }  
 public class ConnectService implements ServiceConnection {  
 @Override  
 public void onServiceConnected(ComponentName name, IBinder service) {  
 messenger = new Messenger(service);  
 Message msg = Message.obtain(null, UsingMessanger.Msg, 0, 0);  
 try {  
 messenger.send(msg);  
 } catch (RemoteException e) {  
 e.printStackTrace();  
 }  
 }  
 @Override  
 public void onServiceDisconnected(ComponentName name) {  
 /**  
 * Called when service disconnected  
 */  
 }  
 }  
 }  


 All Service Binding Source Code

Android News and source code