title: Android, Finish all activities
body: <p>I need to finish all the activities running in an Android application when an exit button is clicked.  How can I do that?</p>
  
  <p>What I want:</p>
  
  <ol>
  <li>An option menu on screen with an EXIT option.</li>
  <li>When I click the Exit menu, the application should close.</li>
  </ol>