java - Android日期选择器计算，特定日期之前和之后

Question

我有一个应用程序，它使用当前日期和用户使用日期选择器选择的日期，如下所示:

• 如果用户选择的日期超过当前日期+280天，一些代码将被执行。

• 如果用户选择的日期小于当前日期，则某些代码将被执行。

我使用此代码来执行此操作..

    Calendar start2 = Calendar.getInstance();

       int birthYear = birthDayDatePicker.getYear();
            int birthMonth = birthDayDatePicker.getMonth();
            int birthDay = birthDayDatePicker.getDayOfMonth();

            start2.set(birthYear, birthMonth, birthDay);

           Calendar cal2 = Calendar.getInstance();
           cal2.setTime(birthDate);
           cal2.add(Calendar.DAY_OF_MONTH,daysToAdd);
 birthDayChosenCalender.set(birthYear,birthMonth,birthDay);
         MaxBirthDayCalender.set(currentYear, currentMonth, currentDay);

          long diff = birthDayChosenCalender.getTimeInMillis() - MaxBirthDayCalender.getTimeInMillis(); //result in millis
          long daysBetween = diff / (24 * 60 * 60 * 1000);
          System.out.println("Days between ,,,,,,,,,,,,,,,,,,"+daysBetween);

          if(MaxBirthDayCalender.before(birthDayChosenCalender) && daysBetween <= 280){

do sth }

有没有其他干净的方法可以做到这一点!因为这种方式不太好用!

Answer 1

另一种简洁的方法是使用 Joda Time 库。

除此之外，一切都可以使用 millis 和单个日历实例来完成:

Calendar pickedDate = new GregorianCalendar(
        picker.getYear(), 
        picker.getMonth(), 
        picker.getDayOfMonth());
long pickedTime = pickedDate.getTimeInMillis();
long now = new Date().getTime();

if (pickedTime - now <= (280 * 24 * 60 * 60 * 1000)) { // 280 days in milliseconds
  // ...
}

应满足要求:

I have an application which use the current date and a date that is chose by user using date picker as follow:

• If the date that the user chose is more than the current date +280 day, some code will be executed.
• If the date that the user chose is less than the current date , some code will be executed.