title: Quitting application in Android
body: <p>I want to quit application in Android. Just put a "quit" button, which kills my app.</p>
  
  <p>I know I shouldn't do this. I know that this is not the philosophy of the OS.</p>
  
  <p>If you know how it can be done, pls share. </p>
  
  <p>In the app, I have many opened activities, so "finish()" will not do the job.</p>
  
  <p>Thank you for your information in advance.
  Danail</p>