如何在用户打开下一个片段时停止 CountDownTimer 计数?

How to stop CountDownTimer from counting when user opens the next fragment?

我有一个 CountDownTimer,当用户来到这个片段时,它开始从 17 秒倒计时到 0。现在应该有两个选项:

  1. 用户在倒计时为 0 之前点击按钮,按钮打开下一个片段

  2. 倒计时到0自动开启下一个片段

这是我想要的结果,但我找不到实现它的方法。当用户单击按钮时,如何停止倒计时?我尝试使用 progressBar.setVisibility(View.GONE);,但倒计时仍在倒计时。非常感谢任何帮助!

这是我的代码:

public View onCreateView (@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

        ...

        // Opens the next fragment after clicking on the Ok button
        btnOkFrag1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                stopCountdownTimer();
                ((GameActivity)getActivity()).setViewPager(2);

            }
        });

        return view;
    }

// Countdown 17 seconds

    int i = 0;

    private void startCountdownTimer() {

        progressBar.setProgress(i);

        final int totalMsecs = 17 * 1000; // 17 seconds in milli seconds
        int callInterval = 100;

        /** CountDownTimer */
        new CountDownTimer(totalMsecs, callInterval) {

            public void onTick(long millisUntilFinished) {

                int secondsRemaining = (int) millisUntilFinished / 1000;

                float fraction = millisUntilFinished / (float) totalMsecs;

                // progress bar is based on scale of 1 to 10.000;
                progressBar.setProgress((int) (fraction * 10000));
            }

            public void onFinish() {

                stopCountdownTimer();
                ((GameActivity)getActivity()).setViewPager(2);
                // TODO: 2019-10-18 Open next fragment when the countdown is finished. If user clicks ok button before finish, stop countdown.

            }
        }.start();
    }

    private void stopCountdownTimer(){
        progressBar.setVisibility(View.GONE);
    }

您可以将 CountDownTimer(如 Ikazuchi 在评论中所说)分配给这样的变量:

  CountDownTimer countDown =  new CountDownTimer(totalMsecs, callInterval) {...

然后在分配给按钮的onClick方法中调用

countDown.cancel()