如何判断日期是本周还是最后？

Question

我有日期数组。例如 10 个日期。我需要计算每个日期 - 这是本周或上周。这是怎么做的？

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;
    }

我通过List<Receipt>，如果收据在本周有日期，我将其添加到新列表中。但它不起作用。

Answer 1

使用类似的东西进行比较：

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;
}

附：要获得更正确的结果，您也可以检查年份（不仅仅是一年中的一周），您可以这样做：int year = c.get(Calendar.YEAR); http://developer.android.com/reference/java/util/Calendar.html#WEEK_OF_YEAR

Answer 2

创建一个比较日期的方法

public boolean isTheSameWeek (Date date ){

Calendar c=Calendar.getInstance();
year1=c.get(c.YEAR);
week1=c.get(c.WEEK_OF_YEAR);

Calendar c1=Calendar.getInstance();
c.setTimeInMillis(date.getTime())
year2=c.get(c.YEAR);
week2=c.get(c.WEEK_OF_YEAR);

if(year1 == year2){
       if(week1 == week2}{
       return true;

       }
    }
return false
}}

在你的方法中调用这个

     if (isTheSameWeek(receiptList.get(i).getCreatedDate())){