java - 在 android 的 java 中暂停倒数计时器

Question

我正在制作一个计时器，它有一个按钮，我可以控制选择递增模式或倒计时模式。倒计时模式运行良好，开始、暂停、重置。倒数计时器是通过倒数Android studio中的倒数计时器制作的。问题是我无法暂停计数计时器并从它停止的地方恢复。这样做的正确方法是什么？我知道这可以通过计时模式来完成，但我正在尝试制作一个定制的计时器小部件，正如我之前提到的，可以按下一个按钮让用户决定他想要的模式。因此，如果可能的话，我不想在当前设置中使用其他小部件。

public void startBuiltInTimer(int millisecondCountingInterval) {

    if (getTimeInMillis() > 0) { //getTimeInMillis will read the time value in the current Timer widget, which is a textView
        builtInTimerIsCounting = true; //set the timer is running flag
        showAsCounting(true);
        if (getTimerCountUpOrDown() == TIMER_COUNT_DOWN) { //countdown mode
            countDownTimer = new CountDownTimer(getTimeInMillis(), millisecondCountingInterval) {
                @Override
                public void onTick(long millisUntilFinished) {
                    setTime(millisUntilFinished);
                    }
                }

                @Override
                public void onFinish() {
                    setTime(0);
                    builtInTimerIsCounting = false;
                    showAsCounting(false);
                    }

                }
            }.start();
        } else if (getTimerCountUpOrDown() == TIMER_COUNT_UP) { //count up mode
            long tempTimeInMillis = getTimeInMillis() + lastTimeMillisUntilFinished; //trying to save the last time value in millis and keep the total time value as user defined.
            setTime(0); //set initial value of the textView to show the count-up timer start from zero, initially.
            countDownTimer = new CountDownTimer(tempTimeInMillis, millisecondCountingInterval) {
                @Override
                public void onTick(long millisUntilFinished) {
                    long temp = tempTimeInMillis - millisUntilFinished;
                    setTime(temp); //reverse the countdown to count-up
                    lastTimeMillisUntilFinished = millisUntilFinished;//keep the millisUntilFinished for next start. 
                }

                @Override
                public void onFinish() {
                    setTime(tempTimeInMillis);
                    builtInTimerIsCounting = false;
                    showAsCounting(false);
                    }

                }
            }.start();
        }
    }

}

编辑:我最终使用 SystemClock 来保持跟踪和记录计数计时器。这是代码。

else if (getTimerCountUpOrDown() == TIMER_COUNT_UP) {
        startCountUpTimer(millisecondCountingInterval);
}

public void startCountUpTimer(int millisecInterval) {
    if (!countUpTimerIsRunning) {
        handler = new Handler();
        myRunnable = new MyRunnable(millisecInterval);    //MyRunnable can pass a variable thru to let handler have more flexibility with postDelay method. You can still use regular Runnable with hard coded time interval in millisec.
        startTime = SystemClock.uptimeMillis();    //use startTime to mark the time when the count up timer start ticking
        handler.postDelayed(myRunnable, millisecInterval);
        countUpTimerIsRunning = true;
    }

}

public class MyRunnable implements Runnable {
    private int interval;

    public MyRunnable(int t) {
        this.interval = t;
    }

    @Override
    public void run() {
        millisecondTime = SystemClock.uptimeMillis() - startTime;    //this is the time value measured by the count up timer
        updateTime = timeBuff + millisecondTime;   
        setTime(updateTime);
        if (updateTime <= countUpMode_Threshold) {
            handler.postDelayed(this, interval);
        } else {
            setTime(countUpMode_Threshold);
            handler.removeCallbacks(myRunnable);
            builtInTimerIsCounting = false;
            showAsCounting(false);
            if (onBuiltInTimerStatusChangeListener != null) {
                onBuiltInTimerStatusChangeListener.onStatusChange(OnBuiltInTimerStatusChangeListener.STATUS_FINISHED);
            }
        }
    }
}

public void pauseCountUpTimer() {
    timeBuff += millisecondTime;
    handler.removeCallbacks(myRunnable);
    countUpTimerIsRunning = false;
}

Answer 1

一种方法是您应该手动跟踪暂停时间并从该时间再次启动计时器。或者您可以尝试使用位于 this link 的实用程序它具有您正在寻找的功能。很有帮助