I want a notification to pop up when an app opens. But once User dismisses, I don't want it to come back again, even if they go back to the same activity. But when the app exits, and they come back later, I want same dialog notification to pop up (prompting user to login).

So basically...

boolean b = true;

if (b == true) {
     // show dialog
     b = false;
} 

I simply want var b to save state but clear on exit.