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Having a countdown timer on a Canvas using Surfaceview class in Android
public class GameView extends SurfaceView {
 double timeleft =60,000 //60  sec
int clicked=0;
 static double starttime;//time when we started game
 double timeleft=300000;

 @Override
protected void onDraw(Canvas canvas) {
   if(clicked==0)
    score.onDraw(canvas,timeleft); // trying to print the score by calling onDraw function in score class
    else {
        double timegone= System.currentTimeMillis() - starttime ;
        timeleft=timeleft-timegone;
        score.onDraw(canvas,timeleft);
    }

       public boolean onTouchEvent(MotionEvent event)
{
    if(clicked==0)
    starttime= System.currentTimeMillis();

          clicked++;
    }
   }
 }

public void onDraw(Canvas canvas, double time) {
    Paint paint = new Paint();
    int min=(int) (time/60000);
    int sec=(int) ((time)%60000);
    paint.setColor(Color.GREEN);
    paint.setTextSize(20);
    canvas.drawText("Coins:"+Integer.toString(coins),gameView.getWidth()-100, 20, paint);
    canvas.drawText("Time Left:"+Integer.toString(min)+":"+Integer.toString(sec),gameView.getWidth()-140, 40, paint);

}