Open a new Activity on Receiving the notification in Android

Hello Droid Guys,

In this tutorial , I am going to explain how to open a new activity class
whenever a push notification comes on your device.

Step 1. For this first of all follow Android Goggle Cloud Messaging  . 
            In this blog I already explain how to register your application for GCM,
            Obtaining the sender id and getting the registration id from GCM server.


step 2. Once you complete the step-1 then inside your GCMIntentService.java class add
            following code.

      @Override  
      protected void onMessage(Context context, Intent arg1) {  
           Log.i(TAG, "new message= ");  
            String message = "success on server";  
         //  displayMessage(context, message);  
          // notifies user  
          generateNotification(context, message);  
      }  

Now,

    /**  
    * Issues a notification to inform the user that server has sent a message.  
    */  
   private static void generateNotification(Context context, String message) {  
     int icon = R.drawable.ic_launcher;  
     long when = System.currentTimeMillis();  
     NotificationManager notificationManager = (NotificationManager)  
         context.getSystemService(Context.NOTIFICATION_SERVICE);  
     Notification notification = new Notification(icon, message, when);  
     String title = context.getString(R.string.app_name);  
     Intent notificationIntent = new Intent(context, Messenger.class);  
     notificationIntent.putExtra("MESSAGE",message);  
     notificationIntent.putExtra("ISNOTIFICATION",true);  
     // set intent so it does not start a new activity  
     notificationIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP |  
         Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);  
     PendingIntent intent =  
         PendingIntent.getActivity(context, 0, notificationIntent, 0);  
     notification.setLatestEventInfo(context, title, message, intent);  
     notification.flags |= Notification.FLAG_AUTO_CANCEL;  
     notificationManager.notify(0, notification);  
   }  

This , will helps you to open a new class whenever apush notification comes.
On tapping the Notification from notification bar.

Enjoy Coding... :)
Cheers :)

Also see this link for help
      1. Google Cloud Messaging