Question

我有数组字符串日期。我需要填写3个ListViews，今天列表，本周的日期和本月的日期。格式为：dd // mm // yy。例如：

{"03.02.16","02.03.16","03.03.16","29.02.16"}

＆＃34; 03.03.16＆＃34; - 今天。＆＃34; 29.02.16＆＃34; - 来自上个月，但就是这样这周我需要将它添加到本周列表中。＆＃34; 02.03.16＆＃34; - 需要进来本周和本月名单。

有一种方法可以在java / android中对日期进行排序吗？

Answer 1

这是使用JSR-310的实现。在Android上，您可以使用Jake Wharton的端口ThreeTenABP。

DateTimeFormatter FORMATTER = DateTimeFormatter.ofPattern("dd.MM.yy");

final List<String> yourDates = someDates();

final List<LocalDate> dates = parseDates(yourDates);

final LocalDate today = getToday(dates);
final List<LocalDate> thisWeek = getDatesThisWeek(dates);
final List<LocalDate> thisMonth = getDatesThisMonth(dates);

...

@Nullable
private LocalDate getToday(List<LocalDate> dates) {
    final LocalDate today = LocalDate.now();
    for (LocalDate date : dates) {
        if (today.equals(date)) {
            return date;
        }
    }

    return null;
}

private List<LocalDate> getDatesThisWeek(List<LocalDate> dates) {
    final TemporalField dayOfWeek = WeekFields.of(Locale.getDefault()).dayOfWeek();
    final LocalDate start = LocalDate.now().with(dayOfWeek, 1);
    final LocalDate end = start.plusDays(6);

    return getDatesBetween(dates, start, end);
}

private List<LocalDate> getDatesThisMonth(List<LocalDate> dates) {
    final LocalDate now = LocalDate.now();
    final LocalDate start = now.withDayOfMonth(1);
    final LocalDate end = now.withDayOfMonth(now.lengthOfMonth());

    return getDatesBetween(dates, start, end);
}

private List<LocalDate> getDatesBetween(List<LocalDate> dates, LocalDate start, LocalDate end) {
    final List<LocalDate> datesInInterval = new ArrayList<>();

    for (LocalDate date : dates) {
        if (start.equals(date) || end.equals(date) || (date.isAfter(start) && date.isBefore(end))) {
            datesInInterval.add(date);
        }
    }

    return datesInInterval;
}

private List<LocalDate> parseDates(List<String> stringDates) {
    final List<LocalDate> dates = new ArrayList<>(stringDates.size());
    for (String stringDate : stringDates) {
        dates.add(LocalDate.parse(stringDate, FORMATTER));
    }

    return dates;
}

更新：您还可以找到实施here。

如何按今天/本周/本月排序日期数组 - android

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