如何使用Android CountDownTimer倒数一天

Question

我是Android开发的新手，我对Android CountDownTimer有疑问。 我如何使用Android的CountDownTimer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？

我对这个问题（ 如何倒数日期 ）有疑问，真的不知道发生了什么吗？ 任何人都可以抽出一点时间来帮助我吗？

谢谢

Answer 1

这就是你的做法

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();
}

Answer 2

有用的方法！

@Override
public void start(final long miliSecond, final int interval) {

    new CountDownTimer(miliSecond, interval) {
        @Override
        public void onTick(long millisUntilFinished) {
            long day = TimeUnit.MILLISECONDS.toDays(millisUntilFinished);
            millisUntilFinished -= TimeUnit.DAYS.toMillis(day);

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

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

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

            intDay.setText("" + day);
            intHour.setText("" + hour);
            intMinute.setText("" + minute);
            intSecond.setText("" + second);
        }

        @Override
        public void onFinish() {
            // What ever you want !
        }

    }.start();

}

Answer 3

Date currentDate=new Date();
Date endDate=new Date();
long difference = endDate.getTime() - currentDate.getTime();
new CountDownTimer(difference, 1000)     {

public void onTick(long millisUntilFinished) {

}

public void onFinish() {
  System.out.println("Done");
 }
}.start();