Countdowntimer not working if I call cancel

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Java

Android

timer

Hi all,

I have a count down timer that created to close video stream after 20 seconds.
My problem is the timer doesn't stop and counting very fast. So I have to call cancel. but when calling cancel it doesn't work.

please check my code below and let me know.
Thanks in advance

What I have tried:

private void StartVideoTimer(int countdownPeriod){
Log.d(LOG_TAG, "[startVideoTimer] - Starting timer for video (in calibration), countdown period = " + countdownPeriod);
/**tried to cancel here*/
//        if (inCalibrationVideoTimer != null) {
//            inCalibrationVideoTimer.cancel();
//            inCalibrationVideoTimer = null;
//        }

streamIsRunning = true;

inCalibrationVideoTimer = new CountDownTimer(countdownPeriod, VIDEO_TIMER_INTERVAL) {
            @Override
            public void onTick(long millisUntilFinished) {
                final int secondsLeft = (int) millisUntilFinished / 1000;
                Log.d(LOG_TAG, "[onTick] - Seconds left = " + secondsLeft);

                SharedPreferences.Editor editor = getSharedPreferences(PREFERENCES_FILE, Context.MODE_PRIVATE).edit();
                editor.putInt("inCalibrationvideoTimerCountdown", secondsLeft);
                editor.apply();

                try {
                    if (streamIsRunning) {
                        runOnUiThread(new Runnable() {
                            @Override
                            public void run() {
							videoTimeTextView.setText(String.format(getString(R.string.common_timer_format), secondsLeft));
                            }
                        });
                    }
                }
                catch (IllegalStateException e) {
                    e.printStackTrace();
                }
            }

            @Override
            public void onFinish() {
                try {
                    if (streamIsRunning) {
                        runOnUiThread(new Runnable() {
                            @Override
                            public void run() {
                                videoTimeTextView.setText(String.format(getString(R.string.common_timer_format), 20));
                            }
                        });
                    }
                }
                catch (IllegalStateException e) {
                    e.printStackTrace();
                }
            }
        }.start();
/**tried to cancel here but not working*/
    }