从Android的时间戳获得天的名称 [英] Get name of day from timestamp in Android

问题描述

我有一个类，它的初始化时，它记录初始化的时间在私人领域与公共的getter：

I have a class that when its initialized, it records the time of initialization in a private field with a public getter:

public class TestClass {

   private long mTimestamp;

    public TestClass(){
      mTimestamp = System.getCurrentMillis();
    }

    public long getTimestamp(){
          return mTimestamp;
    }
}

我也有天的名称的枚举：

I also have an enum with the name of days:

public enum Days implements Serializable {
    MONDAY,
    TUESDAY,
    WEDNESDAY,
    THURSDAY,
    FRIDAY,
    SATURDAY,
    SUNDAY
}

现在的问题是另一个类我一定要得到的时间戳和天字段设置为一天，类初始化：

Now the problem is in another class I have to get the timestamp and set a Days field to the day that the class was initialized:

public class OtherClass {

     public Days getDayOfInitialization(TestClass testClass){
          //how to do this?
          Date date = new Date(testClass.getTimestamp())
          Days day = Date.getDay(); //Deprecated!
          //convert to enum and return...
     }
}

日期的 getDay（）法德precated ......我应该怎么做？

The getDay() method of Date is deprecated...how should I do this?

推荐答案

您不需要那么枚举为日期时间标准（ ISO 8601 ）一个星期定义为周一至周日。

Standard Week

You do not need that Enum as the standard for date-time (ISO 8601) defines a week as Monday to Sunday.

乔达时的英文定义了一天的周每个名称常量如的 DateTimeConstants.MONDAY 。

Joda-Time defines constants for each day-of-week name in English such as DateTimeConstants.MONDAY.

您应该使用乔达时库，作为Java .util.Date和.Calendar类是出了名的麻烦。乔达时根据人的作品在Android中。

You should be using Joda-Time library, as the java.util.Date and .Calendar classes are notoriously troublesome. Joda-Time works in Android according to others.

追踪日期时间以毫秒为单位是达不到最佳。序列化到ISO 8601字符串是preferable。但是，如果你一定要，就这样吧。

Tracking date-time as milliseconds is less than optimal. Serializing to a ISO 8601 string is preferable. But if you must, so be it.

时区是至关重要的。一天的周由时区的定义，如以上所讨论的评论

Time zone is crucial. Day-of-week is defined by time zone, as the comments above discussed.

如果你想 UTC ，乔达时提供恒定的 DateTimeZone.UTC 。

If you want UTC, Joda-Time provides the constant DateTimeZone.UTC.

DateTimeZone timeZone = DateTimeZone.forID( "Europe/Paris" );
DateTime dateTime = new DateTime( millisSinceEpochInUtc, timeZone );
int dayOfWeekNumber = dateTime.getDayOfWeek(); // ISO 8601 standard says Monday is 1.
DateTimeFormatter formatter = DateTimeFormat.forPattern( "EEEE" ).withLocale( java.util.Locale.ENGLISH );
String dayOfWeekName = formatter.print( dateTime );

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