Android倒数计时器不会停止

Question

我是Android新手，我需要一些帮助。我正在使用倒数计时器来更新文本视图，直到某个日期。它的工作正常，但微调器不会在0：0：0：0处停止，而是继续运行，因为此0：0：0：-12。

我希望文本视图文本更改为从0：0：0：0开始。

 SimpleDateFormat formatter = new SimpleDateFormat("dd.MM.yyyy, HH:mm:ss");
        formatter.setLenient(false);


        String endTime = "22.05.2019, 23:48:00";

        Date endDate;
        try {
            endDate = formatter.parse(endTime);
            milliseconds = endDate.getTime();

        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        startTime = System.currentTimeMillis();

        diff = milliseconds - startTime;


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

                startTime = startTime - 1;

                Long serverUptimeSeconds =
                        (millisUntilFinished - startTime) / 1000;

                Toast.makeText(MainActivity.this, "Time left :" + serverUptimeSeconds, Toast.LENGTH_SHORT).show();

                String daysLeft = String.format("%2d", serverUptimeSeconds / 86400);

                String hoursLeft = String.format("%2d", (serverUptimeSeconds % 86400) / 3600);

                String minutesLeft = String.format("%2d", ((serverUptimeSeconds % 86400) % 3600) / 60);

                String secondsLeft = String.format("%2d", ((serverUptimeSeconds % 86400) % 3600) % 60);
                countdownTimerText.setText(daysLeft + ":" + hoursLeft + ":" + minutesLeft + ":" + secondsLeft);


            }

            @Override
            public void onFinish() {
                countdownTimerText.setText("Start");

            }
        }.start();

Answer 1

CountdownTimers API需要millisInTheFuture和interval

https://developer.android.com/reference/android/os/CountDownTimer.html#CountDownTimer(long,%20long)

更容易做类似的事情

new CountdownTimer(TimeUnit.Seconds.toMillis(30), TimeUnit.Seconds.toMillis(1))

// ^这将以1秒的间隔倒计时30秒

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