title: How to resume activity when application relaunched from android launcher?
body: <p>I have an application that implements two activities. Activity A is for selecting some files on device and activity B is to show additional info while these files are processing. Both of them have singleInstance as launch mode. </p>
  
  <p>On application's start activity A runs. Then this activity starts second activity B, that creates a notification. If I tap this notification or open running app from recents, it works fine and shows running activity B. But if I'd started application before and activity B is already running, launching it again from app menu causes showing activity A when old activity B is already running and accesible from notification bar.</p>
  
  <p>So, what should I do to make application run only single activity at the same time and show second activity when called from launcher (if second activity once started and isn't finished)?</p>