java - Android 还剩多少天

Question

我需要从一个日期到第二个日期执行CountDown Days

例如

CURRENT_DATE:3/1/2013 NEXT_DATE:21/01/2013

然后显示::17 DAYS LEFT

我实现了这样的代码

String inputDateString = "01/22/2013";
Calendar calCurr = Calendar.getInstance();
Calendar calNext = Calendar.getInstance();
calNext.setTime(new Date(inputDateString)); 

if(calNext.after(calCurr)) 
{
    long timeDiff = calNext.getTimeInMillis() - calCurr.getTimeInMillis();
    int daysLeft = (int) (timeDiff/DateUtils.DAY_IN_MILLIS);
    dni.setText("Days Left: "+daysLeft);
}
else
{
    long timeDiff = calCurr.getTimeInMillis() - calNext.getTimeInMillis();
    timeDiff = DateUtils.YEAR_IN_MILLIS - timeDiff;
    int daysLeft = (int) (timeDiff/DateUtils.DAY_IN_MILLIS);
}

有没有更好的方法来实现这些目标？

Answer 1

使用 Calendar 的方法:

String inputDateString = "01/22/2013";
Calendar calCurr = Calendar.getInstance();
Calendar day = Calendar.getInstance();
day.setTime(new SimpleDateFormat("MM/dd/yyyy").parse(inputDateString));
if(day.after(calCurr)){
               System.out.println("Days Left: " + (day.get(Calendar.DAY_OF_MONTH) -(calCurr.get(Calendar.DAY_OF_MONTH))) );
}

输出:剩余天数:17

要将年份递增 1 ，您可以使用 Calendar.add() 方法

        day.add(Calendar.YEAR, 1);