android - 如何在我的应用程序中使用 CountDownTimer

Question

在我的应用程序中，我想根据系统时间和我的时间使用CountDownTimer。如果我的时间是 14:30:30 而系统时间是 14:00:00，那么如何在我的应用程序中设置 30 分钟计时器？

这是我试过的代码，

 try {
      Date1 = dateFormat.parse(curranttime);
    } catch (ParseException e) {
        e.printStackTrace();
    }
    try {
      Date2 = dateFormat.parse(mytime);
    } catch (ParseException e) {
        e.printStackTrace();
    }
    long mills = Date1.getTime() - Date2.getTime();
    int Hours = (int) (mills / (1000 * 60 * 60));
    int Mins = (int) (mills / (1000 * 60)) % 60;
    Log.e("Mins",Mins+"");

    CountDownTimer countDownTimer = new CountDownTimer(mills, 1000) {
        public void onTick(long millisUntilFinished) {
            long millis = millisUntilFinished;
            //Convert milliseconds into hour,minute and seconds
            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)));
            holder.txtTime.setText(hms);//set text
        }
        public void onFinish() {
            holder.txtTime.setText("00:00"); //On finish change timer text
        }
    }.start();

注意:我在适配器中使用 CountDownTimer。

Answer 1

try {
  Date1 = dateFormat.parse(curranttime);
} catch (ParseException e) {
    e.printStackTrace();
}
try {
  Date2 = dateFormat.parse(mytime);
} catch (ParseException e) {
    e.printStackTrace();
}
long mills = Date2.getTime() - Date1.getTime();
int Hours = (int) (mills / (1000 * 60 * 60));
int Mins = (int) (mills / (1000 * 60)) % 60;
Log.e("Mins",Mins+"");

CountDownTimer countDownTimer = new CountDownTimer(mills, 1000) {
    public void onTick(long millisUntilFinished) {
        long millis = millisUntilFinished;
        //Convert milliseconds into hour,minute and seconds
        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)));
        holder.txtTime.setText(hms);//set text
    }
    public void onFinish() {
        holder.txtTime.setText("00:00"); //On finish change timer text
    }
}.start();

我可以从系统时间中减去我的时间。实际上减去系统时间到我的时间，它的工作