problem to reset Countdowntimer

Question

I’m putting together a project to learn and I can’t find a solution for a timer, let’s say that time has already been selected 10 minutes and the user wants to change to 5 minutes when clicking 5 min should cancel the old time and start the new but I can’t implement it, follows the code :

if (TIMER != null) {
  TIMER.cancel();
  display.setText("00:00");
} else if (TIMER == null) {
  TIMER = new CountDownTimer(300000, 1000) {
    public void onTick(long millisUntilFinished) {
      display.setText("Tempo restante: " + millisUntilFinished / 1000);
    }
    public void onFinish() {
      display.setText("00:00");
      pausarMusica();
    }
  }.start();
}

Answer 1

I think you’re forgetting to set the TIMER to null when you call the TIMER.cancel();. Since you’re wearing the suit of TIMER was null or not as a flag.

After the first run, according to your code, it will never be null again, so it will never fall in the second if.

That should work:

if (TIMER != null) {
      TIMER.cancel();
      TIMER = null;
      display.setText("00:00");
    } else if (TIMER == null) {
      TIMER = new CountDownTimer(300000, 1000) {
        public void onTick(long millisUntilFinished) {
          display.setText("Tempo restante: " + millisUntilFinished / 1000);
        }
        public void onFinish() {
          display.setText("00:00");
          pausarMusica();
        }
      }.start();
    }