[Solved] How to control multiple CoundownTimer in android

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I would do something like this:

   private void startNewTimer(List<CountDownTimer> listOfTimers) {


        CountDownTimer countDownTimer = new CountDownTimer(1000,1000) {
            @Override
            public void onTick(long millisUntilFinished) {

            }

            @Override
            public void onFinish() {

            }
        }.start();

        listOfTimers.add(countDownTimer);

    }

    private boolean cancelTimers(List<CountDownTimer> listOfTimers) {

        if(listOfTimers != null && !listOfTimers.isEmpty()) {
            for(CountDownTimer cdt : listOfTimers) {
                cdt.cancel();
            }
            listOfTimers = null;
            return true;
        }
        return false;
    }

You may want to create your List<CountDownTimer> listOfTimers as a global variable (List<CountDownTimer> listOfTimers = new ArrayList<>())

You would call the the startNewTimer(list) from the onClick method of your button OnClickListener and the stopTimers where you see fit.

If you want to cancel a specific cancel you could reference it through its index in the List likes this:

private boolean stopTimer(List<CountDownTimer> listOfTimers, int index) {

        if(listOfTimers != null && listOfTimers.size() > index) {
            for(int i = 0; i < listOfTimers.size(); i++) {
                listOfTimers.get(i).cancel();
            }
            return true;
        }
        return false;
    }

solved How to control multiple CoundownTimer in android