我正在编写一个自定义组件，允许用户使用 JAVA SDK 从日历中选择日期。我想将一天设置为一周的第一天（例如星期一），然后将日历显示为一周的第一天（日历的第一列将是设置的那一天）。
在 Android 中，我们在 DatePicker 中有 setFirstDayOfWeek(int firstDayOfWeek) 方法，它为我们做这件事。
Harmony OS 的DatePicker 中的上述替代方案是什么？
问候，苏布汉姆
【问题讨论】：
标签： java android huawei-mobile-services huawei-developers harmonyos
目前还没有直接的api接口来实现，但是可以使用工具类代码来实现。如下：
public static LocalDateTime getMondayForThisWeek(LocalDate localDate) {
LocalDateTime monday = LocalDateTime.of(localDate, LocalTime.MIN).with(DayOfWeek.MONDAY);
return monday;
}
参考代码：
Tool类核心代码：
public class LocalDateTimeUtil {
...
/***
* constructor method
*/
private LocalDateTimeUtil() {
}
/**
* Obtains the date of the Monday of the week to which the specified date belongs.
*
* @param localDate Time
* @return LocalDateTime
*/
public static LocalDateTime getMondayForThisWeek(LocalDate localDate) {
LocalDateTime monday = LocalDateTime.of(localDate, LocalTime.MIN).with(DayOfWeek.MONDAY);
return monday;
}
/**
* Obtains the date of the Sunday of the week to which the specified date belongs.
*
* @param localDate Time
* @return LocalDateTime
*/
public static LocalDateTime getSundayForThisWeek(LocalDate localDate) {
LocalDateTime sunday = LocalDateTime.of(localDate, LocalTime.MIN).with(DayOfWeek.SUNDAY);
return sunday;
}
...
}
XML文件布局：
<?xml version="1.0" encoding="utf-8"?>
<DirectionalLayout
xmlns:ohos="http://schemas.huawei.com/res/ohos"
ohos:height="match_parent"
ohos:width="match_parent"
ohos:orientation="vertical"
>
<DatePicker
ohos:id="$+id:data_picker"
ohos:height="match_content"
ohos:width="match_parent"
ohos:background_element="#C89FDEFF"
/>
</DirectionalLayout>
AbilitySlice中的代码：
public class MainAbilitySlice extends AbilitySlice {
private DatePicker datePicker;
@Override
public void onStart(Intent intent) {
super.onStart(intent);
super.setUIContent(ResourceTable.Layout_ability_main);
initView();
}
private void initView() {
if (findComponentById(ResourceTable.Id_data_picker) instanceof DatePicker) {
datePicker = (DatePicker) findComponentById(ResourceTable.Id_data_picker);
}
if (datePicker != null) {
// If you select Monday or Sunday as the first day of a week, select the corresponding method. This example selects Monday as the first day of the week
LocalDateTime mondayForThisWeek = LocalDateTimeUtil.getMondayForThisWeek(LocalDate.now());
datePicker.updateDate(mondayForThisWeek.getYear(), mondayForThisWeek.getMonth().getValue(), mondayForThisWeek.getDayOfMonth());
}
}
}
【讨论】：