如何使用Android CountDownTimer倒数一天 [英] How to Countdown to a day using Android CountDownTimer

问题描述

我是这里的新手，也是Android开发的新手，我对Android CountDownTimer有疑问。我如何使用Android的CountDownTimer来倒计时到某个特定日期，例如2015年11月6日？另外，如何将Java代码与相应的XML代码一起使用？

I'm new here and new to Android Development, I Have a question regarding the Android CountDownTimer. How am I able to use Android's CountDownTimer, to count down to a specific date, let's say the 6th Novemeber 2015? Also How would I use the Java code with corresponding XML Code?

我在这个问题上遇到了麻烦（如何倒计时到某个日期），真的无法理解发生了什么事吗？有人可以抽出一点时间来帮助我吗？

I had a llok at this question (how to countdown to a date) and couldn't really understand what was going on? Can anyone spare a moment to help me?

谢谢

推荐答案

这正是您的操作方式

更新3

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.your_layout);

    TextView tv_countdown = (TextView) findViewById(R.id.your_textview_id);

    Calendar start_calendar = Calendar.getInstance();
    Calendar end_calendar = Calendar.getInstance();

    long start_millis = start_calendar.getTimeInMillis(); //get the start time in milliseconds
    long end_millis = end_calendar.getTimeInMillis(); //get the end time in milliseconds
    long total_millis = (end_millis - start_millis); //total time in milliseconds
    end_calendar.set(2015, 10, 6); // 10 = November, month start at 0 = January

    //1000 = 1 second interval
    CountDownTimer cdt = new CountDownTimer(total_millis, 1000) {
        @Override
        public void onTick(long millisUntilFinished) {
            long days = TimeUnit.MILLISECONDS.toDays(millisUntilFinished);
            millisUntilFinished -= TimeUnit.DAYS.toMillis(days);

            long hours = TimeUnit.MILLISECONDS.toHours(millisUntilFinished);
            millisUntilFinished -= TimeUnit.HOURS.toMillis(hours);

            long minutes = TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished);
            millisUntilFinished -= TimeUnit.MINUTES.toMillis(minutes);

            long seconds = TimeUnit.MILLISECONDS.toSeconds(millisUntilFinished);

            tv_countdown.setText(days + ":" + hours + ":" + minutes + ":" + seconds); //You can compute the millisUntilFinished on hours/minutes/seconds
        }

        @Override
        public void onFinish() {
            tv_countdown.setText("Finish!");
        }
    };
    cdt.start();
}

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