Question

Assume I have two activities.
Activity A and Activity B, while Activity A is main activity.
There is a button in Activity A that will go to Activity B.
So, Activity A -> click -> Activity B and then click back button, it will go back to Activity A.
However, there is another story that I will have a GCM notification.
When clicking the notification, it will immediately go to Activity B.
But the problem is:

1. If the application already run, when I click the notification and
   go to Activity B, and then click back button, it will correctly go
   back to Activity A.
2. If I kill the application, and click the notification and go to
   Activity B, and then click back button, it will go to the Home
   Screen. But the problem is I want it will go back to Activity A.

How to solve this problem?

Answer 1

Override you onBackPressed method and start the activity A using an intent.

@Override
public void onBackPressed() {
    // TODO Auto-generated method stub
    super.onBackPressed();
        // Start Activity A heres
}