在 Android 中获取当月的周范围

Question

我想在 MPAndroidChart 图表中显示周范围。例如，在二月份，我想显示 xAxis 标签值，如 1-4、5-11、12-18、19-25、26-28。这里的 1-4 来自 2 月的第 1 周，前一个月的日期也可用。但我只需要当月的天数。但是我得到了一周中的所有日期。

 public List<String> getWeeksInCurrentMonth() {
    Calendar cal = Calendar.getInstance();
    cal.set(Calendar.DAY_OF_MONTH, 1);
    int month = cal.get(Calendar.MONTH);

    List<String> weekRanges = new ArrayList<>();

    while (cal.get(Calendar.MONTH) == month) {
        int week = cal.get(Calendar.WEEK_OF_MONTH);
        int year = cal.get(Calendar.YEAR);
        int dayOfWeek = cal.get(Calendar.DAY_OF_WEEK);

        if (dayOfWeek == Calendar.SUNDAY || cal.getActualMaximum(Calendar.DAY_OF_MONTH) == cal.get(Calendar.DAY_OF_MONTH)) {
            int startDay = cal.get(Calendar.DAY_OF_MONTH) - (dayOfWeek - 1);
            int endDay = cal.get(Calendar.DAY_OF_MONTH) + (7 - dayOfWeek);

            if (endDay > cal.getActualMaximum(Calendar.DAY_OF_MONTH)) {
                endDay = cal.getActualMaximum(Calendar.DAY_OF_MONTH);
            }

            if (startDay <= endDay && startDay <= cal.getActualMaximum(Calendar.DAY_OF_MONTH)) {
                weekRanges.add(String.format("%d-%d", startDay, endDay));
            }
        }

        cal.add(Calendar.DAY_OF_MONTH, 1);
    }

    System.out.println(weekRanges);
    return weekRanges;

 }

在美国语言环境中运行时观察到的输出：

[5-11、12-18、19-25、26-28、26-28]

第一周好像少了

有人请在这里说明一下，以实现只有当前月份日期的周范围。

Answer 1

要获取仅包含当前月份日期的周范围，您可以修改 getWeeksInCurrentMonth() 方法中的逻辑以将当前月份考虑在内，并排除上个月或下个月的任何日期。这是一个应该实现所需行为的更新实现：

public List<String> getWeeksInCurrentMonth() {
    Calendar cal = Calendar.getInstance();
    int currentMonth = cal.get(Calendar.MONTH);
    int currentYear = cal.get(Calendar.YEAR);
    cal.set(Calendar.DAY_OF_MONTH, 1);

    List<String> weekRanges = new ArrayList<>();

    while (cal.get(Calendar.MONTH) == currentMonth) {
        int week = cal.get(Calendar.WEEK_OF_MONTH);
        int year = cal.get(Calendar.YEAR);
        int dayOfWeek = cal.get(Calendar.DAY_OF_WEEK);

        // Only consider days in the current month
        if (cal.get(Calendar.MONTH) == currentMonth && cal.get(Calendar.YEAR) == currentYear) {
            int startDay = cal.get(Calendar.DAY_OF_MONTH);
            int endDay = startDay + (7 - dayOfWeek);

            if (endDay > cal.getActualMaximum(Calendar.DAY_OF_MONTH)) {
                endDay = cal.getActualMaximum(Calendar.DAY_OF_MONTH);
            }

            weekRanges.add(String.format("%d-%d", startDay, endDay));
        }

        cal.add(Calendar.DAY_OF_MONTH, 7 - dayOfWeek + 1);
    }

    System.out.println(weekRanges);
    return weekRanges;
}