title: Chronometer countdown in android
body: <p>I have implemented a simple chronometer from the android api demo. Now is it possible to show the countdown in chronometer like setting the start to 01:23 then onClick of start button, it will change to 01:22 then 01:21 and so on... till 00:00. Please let me know if anyone did it before.
  <a href="http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/view/ChronometerDemo.html" rel="nofollow">http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/view/ChronometerDemo.html</a></p>
  
  <p>Thank you.</p>