Backtime

tv = new TextView(this);
    this.setContentView(tv);

//10000 is the starting number (in milliseconds)
//1000 is the number to count down each time (in milliseconds)
MyCount counter = new MyCount(10000,1000);

counter.start();

}

//countdowntimer is an abstract class, so extend it and fill in methods
public class MyCount extends CountDownTimer
{

public MyCount(long millisInFuture, long countDownInterval)
{
super(millisInFuture, countDownInterval);
}

public void onFinish()
{
tv.setText("Time Up!");
}

public void onTick(long millisUntilFinished)
{
tv.setText("Time Left : " + millisUntilFinished/1000);

}