Question

我希望从一年中天数中获取的日期名称。示例：2016年第344天的日期名称是什么。我的服务器给我这样的数据＆amp;必须用它来找出日期名称。

{
  "id": 106,
  "month": 12,
  "year": 2016,
  "yDay": 344,
  "hour": 19
}

我可以从日历中获取当前日期。

Calendar calendar = Calendar.getInstance(); int dayOfYear = calendar.get(Calendar.DAY_OF_YEAR);

Answer 1

首先，您需要使用年份和年份初始化Calendar实例：

Calendar c = Calendar.getInstance();
c.set(Calendar.DAY_OF_YEAR, yourDayOfYear);
c.set(Calendar.YEAR, yourYear);

然后您可以从Calendar

获取星期几

int dayOfWeek = c.get(Calendar.DAY_OF_WEEK);

Answer 2

通过这样的方式实现目标的一种方法：

 public String getNameOfDay(int year, int dayOfYear) {

    Calendar calendar = Calendar.getInstance();
    calendar.set(Calendar.YEAR, year);
    calendar.set(Calendar.DAY_OF_YEAR, dayOfYear);
    String days[] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};

    int dayIndex = calendar.get(Calendar.DAY_OF_WEEK);

    return days[dayIndex - 1];
}

Answer 3

您可以从日期（表格日期从yDay，月，年）获得dayOfWeek

Calendar c = Calendar.getInstance();
c.setTime(yourDate);
int dayOfWeek = c.get(Calendar.DAY_OF_WEEK);

Answer 4

您可以直接从Calendar对象获取星期几作为String：

"Québec".mb_chars.upcase

Answer 5

What is the easiest way to get the current day of the week in Android?

因此，您将获得当天的日期和获得当前日期的方式相同，并以相同的方式获取相同日期的天数。现在就算吧

Answer 6

试试这个，根据你的年月给你一个名字

oslc

如果你有日期格式，那么你可以尝试这个

// Assuming that you already have this.
    int year = 2016;
    int month = 12;
    int day = 2;

    // First convert to Date. This is one of the many ways.
    String dateString = String.format("%d-%d-%d", year, month, day);
    Date date = new SimpleDateFormat("yyyy-M-d").parse(dateString);

    // Then get the day of week from the Date based on specific locale.
    String dayOfWeek = new SimpleDateFormat("EEEE", Locale.ENGLISH).format(date);

    System.out.println(dayOfWeek); // Friday

Answer 7

实现这一目标的另一种方法是使用Joda Time Package。 Android目前只能在Java 1.7上运行，因此它本身没有很好的时间功能。

将Joda时间添加到build.gradle：

compile 'joda-time:joda-time:2.9.4'

然后你可以做类似的事情：

public String getNameOfDay(int year, int yDay) {

    String pattern = year + ";" + yDay;

    DateTimeFormatter dateTimeFormatter = DateTimeFormat.forPattern("y;D");
    DateTime requestedDate = DateTime.parse(pattern, dateTimeFormatter);
    int dayOfWeek = requestedDate.getDayOfWeek();

    //Notice that Monday is 1 and Sunday is 7
    String[] days = {"Monday", "Tuesday", "Thursday", "Friday", "Saturday", "Sunday"};
    return days[dayOfWeek - 1];
}

请注意，我只提供了已经发布的实现此目标的方法的替代方案。如果您不想在项目中添加joda时间，您可以选择其他人已经说过的方式。

Answer 8

这是我使用的方法，并确保您使用相同的格式，这意味着不要使用 - 而不是 /，反之亦然：

 public String getDayName(String date) {
        SimpleDateFormat df = new SimpleDateFormat("M-d-yyyy", Locale.getDefault());

        Date readDate=null;
        try {
            readDate = df.parse(date);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        Calendar c = Calendar.getInstance();
        c.setTime(Objects.requireNonNull(readDate));

        int dayOfWeek = c.get(Calendar.DAY_OF_WEEK);
        String[] days = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};

        return days[dayOfWeek-1];
    }

从年份日期安卓获取日期名称

8 个答案: