protected void onMessage(Context context, Intent intent) receives null

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Java

Mobile

Android

google-app

I have used this tutorial (GCM Demo Application[^]) to run the sample gcm-server application.

I have successfully built both client and server side code.

Now, I got stuck on sending my own message to client application from server.

I have referred this link(Message[^]) to send my own MessageBuilder

So, I modified the code like this,

server side:-

Message msg = new Message.Builder().build();

to

Message msg = new Message.Builder()
          .collapseKey("collapseKey")
          .timeToLive(30)
          .delayWhileIdle(true)
          .addData("key1", "value1")
          .addData("key2", "value2")
          .build();

client side:-

@Override
    protected void onMessage(Context context, Intent intent) {
        Log.i(TAG, "Received message");
        String message = intent.getStringExtra("key2");
        //getString(R.string.gcm_message);
        displayMessage(context, message);
        // notifies user
        generateNotification(context, message);
    }

But Still I'm getting 'null' in client application. Please help me..

Thanks in Advance.