java - 做一个倒数计时器

Question

我想在 android 中制作一个从当前时间开始的新年倒数计时器...

Calendar thatDay = Calendar.getInstance();
thatDay.set(Calendar.DAY_OF_MONTH,1);
thatDay.set(Calendar.MONTH,0); // 0-11 so 1 less
thatDay.set(Calendar.YEAR, 2014);

Calendar today = Calendar.getInstance();
long diff =  thatDay.getTimeInMillis() - today.getTimeInMillis(); 

现在如何将这个diff 转换成日、时、分、秒格式？请帮忙

Answer 1

下面的代码

import java.util.Date;
import java.util.Calendar;

public class cal {
    public static int SECONDS_IN_A_DAY = 24 * 60 * 60;
    public static void main(String[] args) {
        Calendar thatDay = Calendar.getInstance();
        thatDay.setTime(new Date(0)); /* reset */
        thatDay.set(Calendar.DAY_OF_MONTH,1);
        thatDay.set(Calendar.MONTH,0); // 0-11 so 1 less
        thatDay.set(Calendar.YEAR, 2014);

        Calendar today = Calendar.getInstance();
        long diff =  thatDay.getTimeInMillis() - today.getTimeInMillis(); 
        long diffSec = diff / 1000;

        long days = diffSec / SECONDS_IN_A_DAY;
        long secondsDay = diffSec % SECONDS_IN_A_DAY;
        long seconds = secondsDay % 60;
        long minutes = (secondsDay / 60) % 60;
        long hours = (secondsDay / 3600); // % 24 not needed

        System.out.printf("%d days, %d hours, %d minutes and %d seconds\n", days, hours, minutes, seconds);
    }
}

产生

27 days, 17 hours, 18 minutes and 2 seconds
27 days, 17 hours, 18 minutes and 1 seconds
27 days, 17 hours, 18 minutes and 0 seconds
27 days, 17 hours, 17 minutes and 59 seconds
27 days, 17 hours, 17 minutes and 58 seconds
27 days, 17 hours, 17 minutes and 57 seconds
27 days, 17 hours, 17 minutes and 56 seconds
27 days, 17 hours, 17 minutes and 55 seconds
27 days, 17 hours, 17 minutes and 54 seconds
27 days, 17 hours, 17 minutes and 53 seconds

希望这就是你想要的