title: Android: Not end (finish) the last task in stack
body: <p>I would like to know if there is a way to prevent the last task in the Android Task Stack from being finish(); if the user clicks the back button. I do like that the user is sent back to the Home Screen but I would like the last activity to remain in the stack so if the user clicks on the app launcher from the home screen again it doesn't start the main activity again with a new task stack. My app requires the users to sign in and out of it so if they do sign out I want the task stack to be cleared. Does anyone know if this is possible?</p>
  
  <p>Thanks</p>