如何构建具有自定义一周第一天的区域设置？

Question

我需要一个 Locale 对象，它与另一个对象完全相同，但一周的第一天不同（即：星期日而不是星期六）。

具体来说，我需要从周日开始的阿拉伯-埃及语言环境。我正在使用仅支持更改其语言环境的日历控件，因此是我的要求。

Answer 1

您可以创建一个 Calendar 对象并使用 calender.setFirstDayOfWeek() 方法设置第一天。

Locale locale = new Locale("ar-EG", "EG");
TimeZone timeZone = TimeZone.getTimeZone("Egypt");
Calendar calendar = GregorianCalendar.getInstance(locale);
Calendar calendar2 = GregorianCalendar.getInstance(locale);
calendar2.setFirstDayOfWeek(0);
System.out.println("Calender locale: " + locale + "\nTimeZone: "
        + timeZone.getDisplayName(locale) + "FirstDayOfTheWeek:"
        + calendar.getFirstDayOfWeek() + "\nCalender2 locale: "
        + locale + "\nTimeZone: " + timeZone.getDisplayName(locale)
        + "FirstDayOfTheWeek:" + calendar2.getFirstDayOfWeek());

Answer 2

Locale 对象不控制一周的第一天。这是由 Calendar class 通过以下方式完成的：

Locale locale = Locale.forLanguageTag("ar-EG");
Calendar calendar = Calendar.getInstance(locale);
calendar.setFirstDayOfWeek(Calendar.SUNDAY);

根据 Gautam Jose 的回答：

Normally this would've been just fine. Thing is, the control I'm using keeps instantiating Calendar objects according to the default locale (application scope wise), so a custom locale. I actually tried reverse engineering the control and it does not provide leeway around the issue due to it using private members (i.e.: inheriting it can't help here)

如果您直接使用 Java 反射更改这些 private 成员，则不需要继承 API。

首先，检查控件的 class 以找到 Calendar 字段：

public class CalendarControl {
    private Calendar calendar;
}

现在使用：

CalendarControl control; // The instance to manipulate
try {
    Field field = control.getClass().getDeclaredField("calendar");
    field.setAccessible(true);
    field.set(control, calendar); // Pass the new object we created at top of this answer
} catch (Exception ex) {
    // You must catch NoSuchFieldException and IllegalAccessException here
}

如何构建具有自定义一周第一天的区域设置？

How can I construct a Locale with a custom first day of week?

java

android

calendar