如何使用 Android CountDownTimer 倒计时一天

Question

我是新来的，也是 Android 开发的新手，我有一个关于 Android CountDownTimer 的问题。我如何使用 Android 的 CountDownTimer 倒计时到特定日期，比如 2015 年 11 月 6 日？另外，我如何将 Java 代码与相应的 XML 代码一起使用？

我对这个问题很感兴趣 (how to countdown to a date)，但无法真正理解发生了什么？谁能抽出时间帮我一下？

谢谢

Answer 1

这正是您的做法

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

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();

Answer 3

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();

}

如何使用 Android CountDownTimer 倒计时一天

How to Countdown to a day using Android CountDownTimer

java

android

xml

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countdowntimer