如何在 DELPHI ANDROID 中检查一周的第一天是星期一还是星期日？

Question

在 ANDROID 设备上的 DELPHI 中，是否有一种简单的方法来检查一周的第一天是星期一还是星期日？

Answer 1

 GregorianCalendar tepCal = (GregorianCalendar) GregorianCalendar.getInstance();
                Date todayDate = new Date();
                tepCal.setTime(todayDate);
                tepCal.set(Calendar.YEAR, 2016);
                tepCal.set(Calendar.MONTH, 10);// November
                tepCal.set(Calendar.DAY_OF_MONTH, 3);
                dayOfweek = tepCal.get(Calendar.DAY_OF_WEEK) - 1; //It returns 4 (Calendar.DAY_OF_WEEK  returns 1 for sunday)

Answer 2

只需使用此代码：

var
  Calendar: JCalendar;
  UsedFirstDayOfWeek: integer;
begin
  //For default locale use code
  Calendar := TJCalendar.JavaClass.getInstance(TJLocale.JavaClass.getDefault);

  //For US locale (etc UK, ...) use code
  Calendar := TJCalendar.JavaClass.getInstance(TJLocale.JavaClass.US);

  UsedFirstDayOfWeek:= Calendar.getFirstDayOfWeek;

  //Constants used in result
  SUNDAY    Constant Value: 1 (0x00000001)
  MONDAY    Constant Value: 2 (0x00000002)
  TUESDAY   Constant Value: 3 (0x00000003)
  WEDNESDAY Constant Value: 4 (0x00000004)
  THURSDAY  Constant Value: 5 (0x00000005)
  FRIDAY    Constant Value: 6 (0x00000006)
  SATURDAY  Constant Value: 7 (0x00000007)
end;