在Android中从年的周数获取日期

Question

我正在尝试从给定的周数和年份中获取日期。 即使我输入星期和年份，下面的代码也始终显示currentDates。

Calendar c = new GregorianCalendar(Locale.getDefault());
    c.set(Calendar.WEEK_OF_YEAR, 15);
    c.set(Calendar.YEAR, 2015);

    String result = "";

    int firstDayOfWeek = c.getFirstDayOfWeek();
    for (int i = firstDayOfWeek; i < firstDayOfWeek + 7; i++) {
        c.set(Calendar.DAY_OF_WEEK, i);
        result += new SimpleDateFormat("yyyy.MM.dd").format(c.getTime()) + "\n";
    }

而不是获取第15周的日期。我总是获取当前日期值。 我不是这里有什么问题吗？

如何解决这个问题？

谢谢！

Answer 1

尝试这个

  Calendar now = Calendar.getInstance();
  now.set(Calendar.YEAR,2015);
  now.set(Calendar.WEEK_OF_YEAR,15);

  System.out.println(new SimpleDateFormat("yyyy.MM.dd").format(now.getTime()));

OUTPUT

Answer 2

请更新我的代码：它对我有用。

  Calendar now = Calendar.getInstance();
      now.set(Calendar.YEAR,2015);
      now.set(Calendar.WEEK_OF_YEAR,15);


      String result = "";

        int firstDayOfWeek = now.getFirstDayOfWeek();

        Log.e("day","day:"+firstDayOfWeek);
        for (int i = firstDayOfWeek; i < firstDayOfWeek + 7; i++) {
            now.set(Calendar.DAY_OF_WEEK, i);
            result += new SimpleDateFormat("yyyy.MM.dd").format(now.getTime()) + "\n";
        }

    Log.e("result","result:"+result);