title: Application Is stop if i pressed Back Button In Android
body: <p>i have created one application it contains 
  Progress bar with maximum limit.if i press start for starting my progress bar progress bar starts in background and got message box in application only. But if i press BACK button then my application get stop..
  i want my application running in background though i press BACK button..So please tell me how to achieve this..if want code of my application then let me know...</p>