how to display Count down clock?

In my ap开发者_如何转开发plication one option is there which is used to select the application trigger time that is implemented in RadioButtons like : 10 mins, 20Mins, 30mins and 60mins after selecting one of them the application starts at that time.. up to this working fine. But, now I want to display a count down clock after selecting one option from above from that time onwords one clock, I want to display

That will useful to user how much time remaining to trigger the application

if any body knows about this please try to help me

Thanks for reading

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Something like this for short counts:

    public void timerCountDown(final int secondCount){
    Handler handler = new Handler(); 
     handler.postDelayed(new Runnable() {           
         public void run() {                
             if (secondCount > 0){
                 //format time and display
                 counterBox.setText(Integer.toString((secondCount)));
                 timerCountDown(secondCount - 1);
             }else{
                 //do after time is up
                 removeCounterViews();
             }
         }
         }, 1000); 
     }

But this one is even better and it has two events which update the main UI thread: on tick and on finish, where tick's lenght is defined in the second parameter:

        new CountdownTimer(30000, 1000) {

        public void onTick(long millisUntilFinished) {
            mTextField.setText("seconds remaining: " + millisUntilFinished / 1000);
        }

        public void onFinish() {
            mTextField.setText("done!");
        }
     }.start();