소스 코드

private void doCountdown(int duration) {

	// 카운트다운 타이머 설정
	countDownTimer = new CountDownTimer(duration * 1000, 1000) {
		@Override
		public void onTick(long millisUntilFinished) {
			int secondsRemaining = (int) (millisUntilFinished / 1000);
			int minute = (int)Math.floor(secondsRemaining / 60);
			int second = secondsRemaining % 60;
			String formattedTime = String.format("%01d:%02d", minute, second);
			countdownTextView.setText(formattedTime);
		}

		@Override
		public void onFinish() {
		}
	};

	countDownTimer.start(); // 카운트다운 시작
}