如何计算一个学年？答案

【问题标题】：How to calculate a school year?如何计算一个学年？
【发布时间】：2014-08-20 09:06:27
【问题描述】：

我正在尝试使用此日历库TimesSquare，我需要通过以下方式启动日历：

Calendar nextYear = Calendar.getInstance();
nextYear.add(Calendar.YEAR, 1);

CalendarPickerView calendar = (CalendarPickerView) findViewById(R.id.calendar_view);
Date today = new Date();
calendar.init(today, nextYear.getTime())
    .withSelectedDate(today);

我的问题是我需要知道一种方法来创建一个从 9 月开始到次年 8 月结束的日历。

我需要自动执行，我的意思是，如果用户在 8 月打开应用程序，日历需要从“2013 年 9 月”到“2014 年 8 月”，但如果用户在 9 月打开应用程序，日历应从“2014 年 9 月”到“2015 年 8 月”。我不知道如果我解释清楚，每个月的间隔都是一样的，年份必须改变，取决于你打开应用程序的月份。

如何修改之前的代码来解决这个问题？

谢谢。

【问题讨论】：

标签： android date calendar gregorian-calendar

【解决方案1】：

只需将当前日历的 MONTH 字段与 AUGUST 进行比较，然后根据它初始化日历。像这样的：

Calendar today = Calendar.getInstance();
if (today.get(Calendar.MONTH) > Calendar.AUGUST) {
    // set "today" to september of current year and "nextYear" to august of the next one
} else {
    // set "today" to september of previous year and "nextYear" to august of the current one
}

【讨论】：

【解决方案2】：

感谢 yunik 让我清醒。在那之后，我有了下一个工作的想法。

Calendar today_cal = Calendar.getInstance();
        Calendar start_calendar = Calendar.getInstance();
        Calendar end_calendar = Calendar.getInstance();
        CalendarPickerView calendar = (CalendarPickerView) findViewById(R.id.calendar_view);
        Date today = new Date();

        if (today_cal.get(Calendar.MONTH) <= Calendar.AUGUST) {
            // set "today" to september of current year and "nextYear" to august of the next one
            int min_year = today_cal.get(Calendar.YEAR) - 1;
            int min_month = Calendar.SEPTEMBER;
            int min_day = 1;
            start_calendar.set(min_year, min_month, min_day);


            int max_year = today_cal.get(Calendar.YEAR);
            int max_month = Calendar.AUGUST;
            end_calendar.set(max_year, max_month, 1);
            int max_day = end_calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
            end_calendar.set(max_year, max_month, max_day);

            calendar.init(start_calendar.getTime(), end_calendar.getTime()).withSelectedDate(today);
        } else {
            // set "today" to september of previous year and "nextYear" to august of the current one
            int year = today_cal.get(Calendar.YEAR) + 1;
            int month = Calendar.SEPTEMBER;
            int day = 1;

            // set "today" to september of current year and "nextYear" to august of the next one
            int min_year = today_cal.get(Calendar.YEAR);
            int min_month = Calendar.SEPTEMBER;
            int min_day = 1;
            start_calendar.set(min_year, min_month, min_day);

            int max_year = today_cal.get(Calendar.YEAR) + 1;
            int max_month = Calendar.AUGUST;
            end_calendar.set(max_year, max_month, 1);
            int max_day = end_calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
            end_calendar.set(max_year, max_month, max_day);

            calendar.init(start_calendar.getTime(), end_calendar.getTime()).withSelectedDate(today);
        }

我希望这会对某人有所帮助。

【讨论】：