如何确定是星期几还是最后一天？ [英] how to determine whether the date of this week or last?

问题描述

我有日期数组。例如10个日期。我需要计算每个日期-是本周还是上周。

I have date array. For example 10 dates. I need calculate each date - it is this week or last week. How do make this?

private List<Receipt> getSectionPosition(List<Receipt> receiptList){
       List<Receipt> list = new ArrayList<>();
       Date now = new Date();
        for (int i = 0; i<receiptList.size(); i++){
            if (receiptList.get(i).getCreatedDate().compareTo(now)==0){
                list.add(receiptList.get(i));
            }
        }
       return list;
    }

i pass List< Receipt> ，如果收据有本周的日期，则将其添加到新列表中。

i pass List<Receipt> and if receipt has date on this week i add it in new list. but it is not work.

推荐答案

使用类似以下内容进行比较：

Use something like this for comparing:

private List<Receipt> getSectionPosition(List<Receipt> receiptList){
   List<Receipt> list = new ArrayList<>();
   Date now = new Date();
   Calendar c = Calendar.getInstance();
   c.setTime(now);
   int currentWeek = c.get(Calendar.WEEK_OF_YEAR);
   for (int i = 0; i<receiptList.size(); i++){
       c.setTime(receiptList.get(i).getCreatedDate());
       int createdDateWeek = c.get(Calendar.WEEK_OF_YEAR);

       if (currentWeek == createdDateWeek){
           list.add(receiptList.get(i));
       }
   }
   return list;
}

为了获得更正确的结果，您也可以检查年份（而不仅仅是一年中的星期），您可以这样操作： int year = c.get（Calendar.YEAR）;
http://developer.android.com /reference/java/util/Calendar.html#WEEK_OF_YEAR

P.S. for more correct results, you could check the year, too (not just the week of the year), which you could do like this: int year = c.get(Calendar.YEAR); http://developer.android.com/reference/java/util/Calendar.html#WEEK_OF_YEAR

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