Make count down clock Android

We wan to make a count down clock in game, give user 1 minute to try. When time finish, we show inform Game Over.

Declare a global variable CountDownTimer w;

Import library.

Copy to below findViewByid.

w=new CountDownTimer(60000, 1000) {           

  public void onTick(long mil) {

   tv.setText("Seconds remaining: " + mil/1000);

  }      

public void onFinish() {

tv.setText("Seconds remaining: 0");

Intent in = new Intent(MainActivity.this, newclass.class);

startActivity(in);

}

}.start();  

If time still remaining but user press Back button, we need to cancel CountDown.

Copy to above last bracket.
Override

public void onBackPressed()

{        

w.cancel();

finish();

}