我想获取特定月份的周数

android java calendar

2022-09-02 20:38:14

我想得到当月的周数。这包括上个月的最后一周和下个月的第一周。

像这样：

我想在Android上的某个gridview适配器中使用它，并试图操纵这个代码块：

            //FIRST_DAY_OF_WEEK =0;
    int lastDay = month.getActualMaximum(Calendar.DAY_OF_MONTH);
    int firstDay = (int) month.get(Calendar.DAY_OF_WEEK);
    int firstDayNextMonth = nextMonth.get(Calendar.DAY_OF_WEEK);
    int lastDayNextMonth=nextMonth.getActualMaximum(Calendar.DAY_OF_MONTH);
    int nextMonthdays=nextMonth.getMinimalDaysInFirstWeek();

    // figure size of the array
    if (firstDay == 1) {
        days = new String[lastDay + (FIRST_DAY_OF_WEEK * 6)];
    }

    else {
        days = new String[lastDay + firstDay - (FIRST_DAY_OF_WEEK + 1)];
    }

答案 1

“日历”类的“WEEK_OF_YEAR”属性可能对您有用。参考：日历类

创建一个新日期，该日期将是某个月的第一天。获取这一天的一年中的那一周，假设您获得了起始值。

创建一个新日期，该日期将是给定月份的最后一天。获取这一天的一周，所以现在你得到了结束值。

现在结束 - 开始+ 1应该是你想要的。

当一周与另一年或类似年份重叠时，您可能需要处理一些角落情况。但我认为，一旦你把这件事做好了，你就可以用简单的逻辑来做到这一点。

下面是一个简单的示例代码。我认为你可以让它成为功能，并传递任何你想要的东西。

        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, 2013);
        cal.set(Calendar.MONTH, 1);
        cal.set(Calendar.DAY_OF_MONTH, 1);
        int start = cal.get(Calendar.WEEK_OF_YEAR);
        Log.d("BLA BLA", "Value is " + start);
        cal.set(Calendar.YEAR, 2013);
        cal.set(Calendar.MONTH, 1);
        cal.set(Calendar.DAY_OF_MONTH, 28);
        int end = cal.get(Calendar.WEEK_OF_YEAR);
        //Above line will not work for December Month, use following line for this
        int end = isDecember?53:cal.get(Calendar.WEEK_OF_YEAR);
        Log.d("BLA BLA", "Value is " + end);
        Log.d("BLA BLA", "Num weeks:: " + (end - start +1 ));

对于角落情况：

角落情况只会发生在Januaray月份（例如2010年1月，2000年1月），在这些情况下，大多数日子都是前一年最后一周的一部分，因此起始值将为52，结束值将为5。发生这种情况时，请检查是否，

          if(start > end) {
                numweeks = end + 1;
             }

P.S：把它放在你得到的不同测试输入中。让我知道，一旦你发现任何错误，我是否可以改进它。

甚至更简单的解决方案：

        Calendar cal = Calendar.getInstance();
        for(int i = 0 ; i < 11;i++){
            cal.set(Calendar.YEAR, 2013);
            cal.set(Calendar.DAY_OF_MONTH, 1);
            cal.set(Calendar.MONTH, i);
            int maxWeeknumber = cal.getActualMaximum(Calendar.WEEK_OF_MONTH);
            Log.d("LOG","max week number" + maxWeeknumber);
        }

        01-22 01:49:03.591: D/LOG(573): max week number5
        01-22 01:49:03.602: D/LOG(573): max week number5
        01-22 01:49:03.602: D/LOG(573): max week number6
        01-22 01:49:03.671: D/LOG(573): max week number5
        01-22 01:49:03.671: D/LOG(573): max week number5
        01-22 01:49:03.671: D/LOG(573): max week number6
        01-22 01:49:03.681: D/LOG(573): max week number5
        01-22 01:49:03.691: D/LOG(573): max week number5
        01-22 01:49:03.691: D/LOG(573): max week number5
        01-22 01:49:03.711: D/LOG(573): max week number5
        01-22 01:49:03.711: D/LOG(573): max week number5

简单的解决方案适用于角落情况：

        Calendar cal = Calendar.getInstance();
        for(int i = 0 ; i < 11;i++){
            cal.set(Calendar.YEAR, 2010);
            cal.set(Calendar.DAY_OF_MONTH, 1);
            cal.set(Calendar.MONTH, i);
            int maxWeeknumber = cal.getActualMaximum(Calendar.WEEK_OF_MONTH);
            // Month value starts from 0 to 11 for Jan to Dec
            Log.d("LOG","For Month :: "+ i + " Num Week :: " + maxWeeknumber);
        }

日志：

        01-22 01:59:35.841: D/LOG(629): For Month :: 0 Num Week :: 6
        01-22 01:59:35.841: D/LOG(629): For Month :: 1 Num Week :: 5
        01-22 01:59:35.841: D/LOG(629): For Month :: 2 Num Week :: 5
        01-22 01:59:35.841: D/LOG(629): For Month :: 3 Num Week :: 5
        01-22 01:59:35.841: D/LOG(629): For Month :: 4 Num Week :: 6
        01-22 01:59:35.852: D/LOG(629): For Month :: 5 Num Week :: 5
        01-22 01:59:35.871: D/LOG(629): For Month :: 6 Num Week :: 5
        01-22 01:59:35.871: D/LOG(629): For Month :: 7 Num Week :: 5
        01-22 01:59:35.871: D/LOG(629): For Month :: 8 Num Week :: 5
        01-22 01:59:35.871: D/LOG(629): For Month :: 9 Num Week :: 6
        01-22 01:59:35.871: D/LOG(629): For Month :: 10 Num Week :: 5

答案 2

我们可以使用日历类，然后做一些类似的事情

Calendar calendar = Calendar.getInstance();
System.out.println(calendar.getActualMaximum(Calendar.WEEK_OF_MONTH));

这将返回当前月份的周数