Android

//ON SERVICE SIDE
public class YourService extends Service {
  public static final int SAY_HELLO = 1;  
  public static final int REPLY_HELLO = 2;  

  private int cnt = 0;

  class IncomingHandler extends Handler {
    @Override
    public void handleMessage(Message msg) {
      switch (msg.what) {
        case SAY_HELLO:
          msg.replyTo.send(Message.obtain(null, REPLY_HELLO, cnt++, 0));
        break;
      } 
    }  

  /**
   * Target we publish for clients to send messages to IncomingHandler.
   */
  final IncomingHandler mHandler = new IncomingHandler();
  final Messenger mMessenger = new Messenger(mHandler);

}


//ON CLIENT SIDE

...
final Messenger mMessenger = new Messenger(new IncomingHandler()); //You can do it... 
private Messenger mBoundService;


private ServiceConnection mConnection = new ServiceConnection() {
	    public void onServiceConnected(ComponentName className, IBinder service) {
	        mBoundService = new Messenger(service);
	        mIsBound = true;
	        try{
	        	Message msg = Message.obtain(null, 1);
	        	msg.replyTo = mMessenger;
	            mBoundService.send(msg);
	        } catch (RemoteException ex){
	        	ex.printStackTrace();
	        }
	    }

	    public void onServiceDisconnected(ComponentName className) {
	    	mBoundService = null;
	        Toast.makeText(context, "Connection GONE", Toast.LENGTH_SHORT).show();
	    }
	};
	

	public void doBindService() {
		Intent intent = new Intent("com.yourpackage.YourService");
		if (!context.bindService(intent, mConnection, Context.BIND_AUTO_CREATE)) {
		    try { 
		        context.unbindService(mConnection);
		    } catch (Throwable t) {}
		    // Clean up 
		    return;
		}
	}

	public void doUnbindService() {
	    if (mIsBound) {
	    	Message msg = Message.obtain(null, MESSAGE_UNREGISTER_CLIENT);
	    	msg.replyTo = mMessenger; 
	    	try{
	    		 mBoundService.send(msg);
	    	 } catch (RemoteException ex){
		     }
	        context.unbindService(mConnection);
	        mIsBound = false;
	    }
	}