倒數計時器運作不正常

Question

我有一個倒計時計時器，該計時器可獲取我的時間選擇器的值，並在設置時間選擇器時開始遞減計數，但是發生的是它沒有倒計時到您設置時間選擇器的當前時間。 我的問題是如何讓我的倒數計時器倒數至目前時間。

這是我的代碼...

   TimePickerDialog.OnTimeSetListener onTimeSetListener = new TimePickerDialog.OnTimeSetListener() {
    @Override
    public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
        timer = new CounterClass((minute * 60 * 1000) + (hourOfDay * 60 * 60 * 1000), 1000);
        long millis = (minute * 60 *1000) + (hourOfDay * 60 * 60 *1000);
        String hms = String.format("%02d:%02d:%02d", TimeUnit.MILLISECONDS.toHours(millis), TimeUnit.MILLISECONDS.toMinutes(millis) - TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS.toHours(millis)),
                TimeUnit.MILLISECONDS.toSeconds(millis) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millis)));
        System.out.println(hms);
        textViewTime.setText(hms);
        timer.start();

    }
};


public class CounterClass extends CountDownTimer {

    /**
     * @param millisInFuture    The number of millis in the future from the call
     *                          to {@link #start()} until the countdown is done and {@link #onFinish()}
     *                          is called.
     * @param countDownInterval The interval along the way to receive
     *                          {@link #onTick(long)} callbacks.
     */

    public CounterClass(long millisInFuture, long countDownInterval) {
        super(millisInFuture, countDownInterval);
    }

    @TargetApi(Build.VERSION_CODES.GINGERBREAD)
    @Override
    public void onTick(long millisUntilFinished) {
        long millis = millisUntilFinished;
        String hms = String.format("%02d:%02d:%02d", TimeUnit.MILLISECONDS.toHours(millis), TimeUnit.MILLISECONDS.toMinutes(millis) - TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS.toHours(millis)),
                TimeUnit.MILLISECONDS.toSeconds(millis) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millis)));
        System.out.println(hms);
        textViewTime.setText(hms);
        Bundle b = new Bundle();
        b.putString(hms, hms);
        Intent mainActivity = new Intent("android.intent.action.MAIN");
        mainActivity.putExtras(b);



    }

    @Override
    public void onFinish() {

    }
}

謝謝：）

Answer 1

您將需要獲取當前時間與所選時間之間的時差，您可以使用類似以下的方法：

public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
    Calendar c = Calendar.getInstance();
    int totalMinutesSelected = (hourOfDay * 60) + minute;
    int totalMinutesNow =(c.get(Calendar.HOUR_OF_DAY) * 60) + c.get(Calendar.MINUTE);
    int seconds = (totalMinutesSelected - totalMinutesNow) * 60;
    timer = new CounterClass(seconds, 1000);
    ...
}

在CounterClass類中，您將必須執行以下操作；

public class CounterClass extends CountDownTimer {

    Calendar c = Calendar.getInstance();

    ...

    public void onTick(long millisUntilFinished) {
        c.setTimeInMillis(System.currentTimeMillis() + millisUntilFinished);
        String hms = String.format("%02d:%02d:%02d", c.get(Calendar.HOUR_OF_DAY), c.get(Calendar.MINUTE), c.get(Calendar.SECOND));
        ...
    }
}