在Android中從年的周數獲取日期

Question

我正在嘗試從給定的周數和年份中獲取日期。 即使我輸入星期和年份，下面的代碼也始終顯示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";
    }

而不是獲取第15周的日期。我總是獲取當前日期值。 我不是這里有什么問題嗎？

如何解決這個問題？

謝謝！

Answer 1

嘗試這個

  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

請更新我的代碼：它對我有用。

  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);