Android 7.x（API24）WEEK_OF_MONTH日历错误？

时间：2017-06-30 15:12:55

标签： android calendar android-7.0-nougat android-7.1-nougat

我们在使用Calendar的Android 7（API 24/25）中遇到了一些奇怪的行为。

鉴于这个相当简单的代码：

SimpleDateFormat month_date = new SimpleDateFormat("dd.MM.YYYY");
Calendar cal = new GregorianCalendar(TimeZone.getTimeZone("Europe/Berlin"), Locale.GERMANY);
cal.setFirstDayOfWeek(Calendar.MONDAY);

for (int month = Calendar.JANUARY; month <= Calendar.DECEMBER; month++) {
    Calendar start = ((Calendar) cal.clone());
    start.set(2017, month, 1);

    Calendar end = ((Calendar) start.clone());
    end.set(Calendar.DAY_OF_MONTH, end.getActualMaximum(Calendar.DAY_OF_MONTH));

    Log.d("CAL", "\n    Date Start: " + month_date.format(start.getTime()) + " " +
        " WEEK_OF_MONTH: " + start.get(Calendar.WEEK_OF_MONTH)
    );
    Log.d("CAL", "\n    Date End: " + month_date.format(end.getTime()) +
        " WEEK_OF_MONTH: " + end.get(Calendar.WEEK_OF_MONTH)
       );
}

在Android 4.0x，5.x和6.x上运行，显示WEEK_OF_MONTH的正确值：

 Date Start: 01.01.2016  WEEK_OF_MONTH: 1
 Date End: 31.01.2017 WEEK_OF_MONTH: 6
 Date Start: 01.02.2017  WEEK_OF_MONTH: 1
 Date End: 28.02.2017 WEEK_OF_MONTH: 5
 Date Start: 01.03.2017  WEEK_OF_MONTH: 1
 Date End: 31.03.2017 WEEK_OF_MONTH: 5
 Date Start: 01.04.2017  WEEK_OF_MONTH: 1
 Date End: 30.04.2017 WEEK_OF_MONTH: 5
 Date Start: 01.05.2017  WEEK_OF_MONTH: 1
 Date End: 31.05.2017 WEEK_OF_MONTH: 5
 Date Start: 01.06.2017  WEEK_OF_MONTH: 1
 Date End: 30.06.2017 WEEK_OF_MONTH: 5
 Date Start: 01.07.2017  WEEK_OF_MONTH: 1
 Date End: 31.07.2017 WEEK_OF_MONTH: 6
 Date Start: 01.08.2017  WEEK_OF_MONTH: 1
 Date End: 31.08.2017 WEEK_OF_MONTH: 5
 Date Start: 01.09.2017  WEEK_OF_MONTH: 1
 Date End: 30.09.2017 WEEK_OF_MONTH: 5
 Date Start: 01.10.2017  WEEK_OF_MONTH: 1
 Date End: 31.10.2017 WEEK_OF_MONTH: 6
 Date Start: 01.11.2017  WEEK_OF_MONTH: 1
 Date End: 30.11.2017 WEEK_OF_MONTH: 5
 Date Start: 01.12.2017  WEEK_OF_MONTH: 1
 Date End: 31.12.2017 WEEK_OF_MONTH: 5

在Android 7.x上运行WEEK_OF_MONTH：

 Date Start: 01.01.2016  WEEK_OF_MONTH: 0
 Date End: 31.01.2017 WEEK_OF_MONTH: 5
 Date Start: 01.02.2017  WEEK_OF_MONTH: 1
 Date End: 28.02.2017 WEEK_OF_MONTH: 5
 Date Start: 01.03.2017  WEEK_OF_MONTH: 1
 Date End: 31.03.2017 WEEK_OF_MONTH: 5
 Date Start: 01.04.2017  WEEK_OF_MONTH: 0
 Date End: 30.04.2017 WEEK_OF_MONTH: 4
 Date Start: 01.05.2017  WEEK_OF_MONTH: 1
 Date End: 31.05.2017 WEEK_OF_MONTH: 5
 Date Start: 01.06.2017  WEEK_OF_MONTH: 1
 Date End: 30.06.2017 WEEK_OF_MONTH: 5
 Date Start: 01.07.2017  WEEK_OF_MONTH: 0
 Date End: 31.07.2017 WEEK_OF_MONTH: 5
 Date Start: 01.08.2017  WEEK_OF_MONTH: 1
 Date End: 31.08.2017 WEEK_OF_MONTH: 5
 Date Start: 01.09.2017  WEEK_OF_MONTH: 0
 Date End: 30.09.2017 WEEK_OF_MONTH: 4
 Date Start: 01.10.2017  WEEK_OF_MONTH: 0
 Date End: 31.10.2017 WEEK_OF_MONTH: 5
 Date Start: 01.11.2017  WEEK_OF_MONTH: 1
 Date End: 30.11.2017 WEEK_OF_MONTH: 5
 Date Start: 01.12.2017  WEEK_OF_MONTH: 0
 Date End: 31.12.2017 WEEK_OF_MONTH: 4

我们在API 24中找不到Calendar的任何文档更改。

有任何线索如何解决这个问题？

我们已经为WEEK_OF_MONTH实现了我们自己的方法，返回与Android 6.x相同的值，但是它的外观set(WEEK_OF_MONTH)也被破坏了。 使用Joda重写代码不是一种选择。

1 个答案:

答案 0 :(得分：1)

您可以使用setMinimalDaysInFirstWeek()方法change how the weeks are counted：

Calendar cal = new GregorianCalendar(TimeZone.getTimeZone("Europe/Berlin"), Locale.GERMANY);
cal.setFirstDayOfWeek(Calendar.MONDAY);
cal.setMinimalDaysInFirstWeek(1);

这将为一周的生成正确的值。

你说用Joda-Time重写代码不是一个选择，但是另一个API怎么样呢？

在Android中，您可以使用ThreeTen Backport，这是Java 8的新日期/时间类的优秀后端，以及ThreeTenABP（更多关于如何使用它here）。< / p>

BTW，Joda-Time处于维护模式，正在被新的API取代，所以我不建议用它来启动新项目。即使在joda's website中它也说：“请注意，Joda-Time被认为是一个很大程度上”完成“的项目。没有计划大的增强。如果使用Java SE 8，请迁移到java.time（JSR） -310）。“即可。

以下课程属于org.threeten.bp个套餐。代码将是这样的：

import java.util.Locale;
import org.threeten.bp.DayOfWeek;
import org.threeten.bp.LocalDate;
import org.threeten.bp.Month;
import org.threeten.bp.format.DateTimeFormatter;
import org.threeten.bp.format.DateTimeFormatterBuilder;
import org.threeten.bp.temporal.TemporalAdjusters;
import org.threeten.bp.temporal.WeekFields;

DateTimeFormatter fmt = new DateTimeFormatterBuilder()
    // day and month
    .appendPattern("dd.MM.")
    // week based year (equivalent to YYYY in SimpleDateFormat)
    .appendValue(WeekFields.ISO.weekBasedYear())
    // create formatter
    .toFormatter(Locale.GERMANY);

// week starting at monday, consider week=1 even if it has 1 day (default is 4)
WeekFields wf = WeekFields.of(DayOfWeek.MONDAY, 1);
for (Month month : Month.values()) {
    LocalDate start = LocalDate.of(2017, month, 1);
    LocalDate end = start.with(TemporalAdjusters.lastDayOfMonth());

    System.out.println("Date Start: " + fmt.format(start) + " " + " WEEK_OF_MONTH: " + start.get(wf.weekOfMonth()));
    System.out.println("Date End: " + fmt.format(end) + " WEEK_OF_MONTH: " + end.get(wf.weekOfMonth()));
}

输出将是：

Date Start: 01.01.2016  WEEK_OF_MONTH: 1
Date End: 31.01.2017 WEEK_OF_MONTH: 6
Date Start: 01.02.2017  WEEK_OF_MONTH: 1
Date End: 28.02.2017 WEEK_OF_MONTH: 5
Date Start: 01.03.2017  WEEK_OF_MONTH: 1
Date End: 31.03.2017 WEEK_OF_MONTH: 5
Date Start: 01.04.2017  WEEK_OF_MONTH: 1
Date End: 30.04.2017 WEEK_OF_MONTH: 5
Date Start: 01.05.2017  WEEK_OF_MONTH: 1
Date End: 31.05.2017 WEEK_OF_MONTH: 5
Date Start: 01.06.2017  WEEK_OF_MONTH: 1
Date End: 30.06.2017 WEEK_OF_MONTH: 5
Date Start: 01.07.2017  WEEK_OF_MONTH: 1
Date End: 31.07.2017 WEEK_OF_MONTH: 6
Date Start: 01.08.2017  WEEK_OF_MONTH: 1
Date End: 31.08.2017 WEEK_OF_MONTH: 5
Date Start: 01.09.2017  WEEK_OF_MONTH: 1
Date End: 30.09.2017 WEEK_OF_MONTH: 5
Date Start: 01.10.2017  WEEK_OF_MONTH: 1
Date End: 31.10.2017 WEEK_OF_MONTH: 6
Date Start: 01.11.2017  WEEK_OF_MONTH: 1
Date End: 30.11.2017 WEEK_OF_MONTH: 5
Date Start: 01.12.2017  WEEK_OF_MONTH: 1
Date End: 31.12.2017 WEEK_OF_MONTH: 5
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