我试图找出两个特定日期的日历日期列表。但我只在同一年内得到两个日期。
我做了什么：
private ArrayList<Calendar> weekendList = null;
public void findWeekendsList(long startDate, long endDate)
{
weekendList = new ArrayList();
Calendar calendarStart = null;
Calendar calendarEnd=null;
calendarStart= Calendar.getInstance();
calendarStart.setTimeInMillis(startDate);
/*calendarEnd= Calendar.getInstance();
calendarEnd.setTimeInMillis(endDate);
*/
// The while loop ensures that you are only checking dates in the current year
while(calendar.get(Calendar.YEAR) == Calendar.getInstance().get(Calendar.YEAR)){
// The switch checks the day of the week for Saturdays and Sundays
switch(calendar.get(Calendar.DAY_OF_WEEK)){
case Calendar.SATURDAY:
case Calendar.SUNDAY:
weekendList.add(calendar);
break;
}
// Increment the day of the year for the next iteration of the while loop
calendar.add(Calendar.DAY_OF_YEAR, 1);
}
}
我有102个周末，就像1月9日到12月31日，但我想今天约会（2018年1月9日）到明年（如2019年1月9日），所有周末都在arrayList。
如果有人有任何想法，这对我有很大的帮助。
答案 0 :(得分：3)
所以，立即，你有很多问题突出......
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<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:custom="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.constraint.ConstraintLayout
android:id="@+id/first_row"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintDimensionRatio="4:1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<com.my.app.presentation.component.FilterObjectTypeWithImageView
android:id="@+id/all_background_filter_view"
android:layout_width="0dp"
android:layout_height="0dp"
custom:text="@string/filter_all"
android:visibility="invisible"
app:layout_constraintDimensionRatio="1:1"
app:layout_constraintHorizontal_chainStyle="spread"
app:layout_constraintEnd_toStartOf="@id/stay_filter_view"
app:layout_constraintStart_toStartOf="@id/first_row"
app:layout_constraintTop_toTopOf="@id/first_row"
app:layout_constraintBottom_toBottomOf="@id/first_row"/>
<com.my.app.presentation.component.FilterObjectTypeIconlessView
android:id="@+id/all_filter_view"
android:layout_width="0dp"
android:layout_height="0dp"
custom:text="@string/filter_all"
app:layout_constraintStart_toStartOf="@id/all_background_filter_view"
app:layout_constraintEnd_toEndOf="@id/all_background_filter_view"
app:layout_constraintTop_toTopOf="@id/all_background_filter_view"
app:layout_constraintBottom_toBottomOf="@id/all_background_filter_view"/>
<com.my.app.presentation.component.FilterObjectTypeWithImageView
android:id="@+id/stay_filter_view"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintDimensionRatio="1:1"
app:layout_constraintEnd_toStartOf="@id/restaurants_filter_view"
app:layout_constraintStart_toEndOf="@id/all_background_filter_view"
app:layout_constraintTop_toTopOf="@id/first_row"
app:layout_constraintBottom_toBottomOf="@id/first_row"
custom:src="@drawable/icon__accomodation__x3"
custom:text="@string/filter_stay" />
<com.my.app.presentation.component.FilterObjectTypeWithImageView
android:id="@+id/restaurants_filter_view"
android:layout_width="0dp"
android:layout_height="0dp"
custom:text="@string/filter_restaurants"
custom:src="@drawable/icon__restaurant__x3"
app:layout_constraintDimensionRatio="1:1"
app:layout_constraintStart_toEndOf="@id/stay_filter_view"
app:layout_constraintEnd_toStartOf="@id/shops_filter_view"
app:layout_constraintTop_toTopOf="@id/first_row"
app:layout_constraintBottom_toBottomOf="@id/first_row" />
<com.my.app.presentation.component.FilterObjectTypeWithImageView
android:id="@+id/shops_filter_view"
android:layout_width="0dp"
android:layout_height="0dp"
custom:text="@string/filter_shops"
custom:src="@drawable/icon__shop__x3"
app:layout_constraintDimensionRatio="1:1"
app:layout_constraintStart_toEndOf="@id/restaurants_filter_view"
app:layout_constraintTop_toTopOf="@id/first_row"
app:layout_constraintBottom_toBottomOf="@id/first_row"
app:layout_constraintEnd_toEndOf="@id/first_row"/>
<android.support.constraint.ConstraintLayout
android:id="@+id/second_row"
android:layout_width="match_parent"
android:layout_height="0dp"
app:layout_constraintDimensionRatio="4:1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="@id/first_row" />
<com.my.app.presentation.component.FilterObjectTypeWithImageView
android:id="@+id/sights_filter_view"
android:layout_width="0dp"
android:layout_height="0dp"
custom:text="@string/filter_sights"
custom:src="@drawable/icon__sights__x3"
app:layout_constraintHorizontal_chainStyle="spread"
app:layout_constraintDimensionRatio="1:1"
app:layout_constraintStart_toStartOf="@id/second_row"
app:layout_constraintEnd_toStartOf="@id/sports_filter_view"
app:layout_constraintTop_toTopOf="@id/second_row"
app:layout_constraintBottom_toBottomOf="@id/second_row"
/>
<com.my.app.presentation.component.FilterObjectTypeWithImageView
android:id="@+id/sports_filter_view"
android:layout_width="0dp"
android:layout_height="0dp"
custom:text="@string/filter_sports"
custom:src="@drawable/icon__sport__x3"
app:layout_constraintDimensionRatio="1:1"
app:layout_constraintStart_toEndOf="@id/sights_filter_view"
app:layout_constraintEnd_toStartOf="@id/educational_filter_view"
app:layout_constraintTop_toTopOf="@id/second_row"
app:layout_constraintBottom_toBottomOf="@id/second_row"/>
<com.my.app.presentation.component.FilterObjectTypeWithImageView
android:id="@+id/educational_filter_view"
android:layout_width="0dp"
android:layout_height="0dp"
custom:text="@string/filter_educational"
custom:src="@drawable/icon__study__x3"
app:layout_constraintDimensionRatio="1:1"
app:layout_constraintStart_toEndOf="@id/sports_filter_view"
app:layout_constraintEnd_toStartOf="@id/public_filter_view"
app:layout_constraintTop_toTopOf="@id/second_row"
app:layout_constraintBottom_toBottomOf="@id/second_row"/>
<com.my.app.presentation.component.FilterObjectTypeWithImageView
android:id="@+id/public_filter_view"
android:layout_width="0dp"
android:layout_height="0dp"
custom:text="@string/filter_public"
custom:src="@drawable/icon__public__x3"
app:layout_constraintDimensionRatio="1:1"
app:layout_constraintEnd_toEndOf="@id/second_row"
app:layout_constraintTop_toTopOf="@id/second_row"
app:layout_constraintStart_toEndOf="@id/educational_filter_view"
app:layout_constraintBottom_toBottomOf="@id/second_row"/>
<View
android:id="@+id/all_filter_top_border"
android:layout_width="0dp"
android:layout_height="1dp"
android:background="@color/filterUnactivatedColor"
app:layout_constraintStart_toStartOf="@id/all_filter_view"
app:layout_constraintEnd_toStartOf="@id/stay_filter_view"
app:layout_constraintTop_toTopOf="parent"/>
<View
android:id="@+id/all_filter_bottom_border"
android:layout_width="0dp"
android:layout_height="1dp"
android:background="@color/filterUnactivatedColor"
app:layout_constraintStart_toStartOf="@id/all_filter_view"
app:layout_constraintEnd_toStartOf="@id/stay_filter_view"
app:layout_constraintTop_toBottomOf="@id/all_filter_view"/>
<View
android:id="@+id/stay_filter_top_border"
android:layout_width="0dp"
android:layout_height="1dp"
android:background="@color/filterUnactivatedColor"
app:layout_constraintStart_toStartOf="@id/stay_filter_view"
app:layout_constraintEnd_toStartOf="@id/restaurants_filter_view"
app:layout_constraintTop_toTopOf="@id/stay_filter_view"/>
<View
android:id="@+id/stay_filter_bottom_border"
android:layout_width="0dp"
android:layout_height="1dp"
android:background="@color/filterUnactivatedColor"
app:layout_constraintStart_toStartOf="@id/stay_filter_view"
app:layout_constraintEnd_toStartOf="@id/restaurants_filter_view"
app:layout_constraintTop_toBottomOf="@id/stay_filter_view"/>
<View
android:id="@+id/restaurants_filter_top_border"
android:layout_width="0dp"
android:layout_height="1dp"
android:background="@color/filterUnactivatedColor"
app:layout_constraintStart_toStartOf="@id/restaurants_filter_view"
app:layout_constraintEnd_toStartOf="@id/shops_filter_view"
app:layout_constraintTop_toTopOf="parent"/>
<View
android:id="@+id/restaurants_filter_bottom_border"
android:layout_width="0dp"
android:layout_height="1dp"
android:background="@color/filterUnactivatedColor"
app:layout_constraintStart_toStartOf="@id/restaurants_filter_view"
app:layout_constraintEnd_toStartOf="@id/shops_filter_view"
app:layout_constraintTop_toBottomOf="@id/restaurants_filter_view"/>
<View
android:id="@+id/shops_filter_top_border"
android:layout_width="0dp"
android:layout_height="1dp"
android:background="@color/filterUnactivatedColor"
app:layout_constraintStart_toStartOf="@id/shops_filter_view"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"/>
<View
android:id="@+id/shops_filter_bottom_border"
android:layout_width="0dp"
android:layout_height="1dp"
android:background="@color/filterUnactivatedColor"
app:layout_constraintStart_toStartOf="@id/shops_filter_view"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="@id/shops_filter_view"/>
<View
android:id="@+id/sights_filter_bottom_border"
android:layout_width="0dp"
android:layout_height="1dp"
android:background="@color/filterUnactivatedColor"
app:layout_constraintStart_toStartOf="@id/sights_filter_view"
app:layout_constraintEnd_toStartOf="@id/sports_filter_view"
app:layout_constraintBottom_toBottomOf="@id/sights_filter_view"/>
<View
android:id="@+id/sports_filter_bottom_border"
android:layout_width="0dp"
android:layout_height="1dp"
android:background="@color/filterUnactivatedColor"
app:layout_constraintStart_toStartOf="@id/sports_filter_view"
app:layout_constraintEnd_toStartOf="@id/educational_filter_view"
app:layout_constraintBottom_toBottomOf="@id/sports_filter_view"/>
<View
android:id="@+id/educational_filter_bottom_border"
android:layout_width="0dp"
android:layout_height="1dp"
android:background="@color/filterUnactivatedColor"
app:layout_constraintStart_toStartOf="@id/educational_filter_view"
app:layout_constraintEnd_toStartOf="@id/public_filter_view"
app:layout_constraintBottom_toBottomOf="@id/educational_filter_view"/>
<View
android:id="@+id/public_filter_bottom_border"
android:layout_width="0dp"
android:layout_height="1dp"
android:background="@color/filterUnactivatedColor"
app:layout_constraintStart_toStartOf="@id/public_filter_view"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintBottom_toBottomOf="@id/public_filter_view"/>
<View
android:id="@+id/all_filter_left_border"
android:layout_width="1dp"
android:layout_height="0dp"
android:background="@color/filterUnactivatedColor"
app:layout_constraintTop_toTopOf="@id/all_filter_view"
app:layout_constraintBottom_toBottomOf="@id/all_filter_view"
app:layout_constraintStart_toStartOf="@id/all_filter_view"/>
<View
android:id="@+id/sights_filter_left_border"
android:layout_width="1dp"
android:layout_height="0dp"
android:background="@color/filterUnactivatedColor"
app:layout_constraintTop_toTopOf="@id/sights_filter_view"
app:layout_constraintBottom_toBottomOf="@id/sights_filter_view"
app:layout_constraintStart_toStartOf="@id/sights_filter_view"/>
<View
android:id="@+id/stay_filter_left_border"
android:layout_width="1dp"
android:layout_height="0dp"
android:background="@color/filterUnactivatedColor"
app:layout_constraintTop_toTopOf="@id/stay_filter_view"
app:layout_constraintBottom_toTopOf="@id/sports_filter_view"
app:layout_constraintStart_toStartOf="@id/stay_filter_view"/>
<View
android:id="@+id/sports_filter_left_border"
android:layout_width="1dp"
android:layout_height="0dp"
android:background="@color/filterUnactivatedColor"
app:layout_constraintTop_toTopOf="@id/sports_filter_view"
app:layout_constraintBottom_toBottomOf="@id/sports_filter_view"
app:layout_constraintStart_toStartOf="@id/sports_filter_view"/>
<View
android:id="@+id/restaurants_filter_left_border"
android:layout_width="1dp"
android:layout_height="0dp"
android:background="@color/filterUnactivatedColor"
app:layout_constraintTop_toTopOf="@id/restaurants_filter_view"
app:layout_constraintBottom_toTopOf="@id/educational_filter_view"
app:layout_constraintStart_toStartOf="@id/restaurants_filter_view"/>
<View
android:id="@+id/educational_filter_left_border"
android:layout_width="1dp"
android:layout_height="0dp"
android:background="@color/filterUnactivatedColor"
app:layout_constraintTop_toTopOf="@id/educational_filter_view"
app:layout_constraintBottom_toBottomOf="@id/educational_filter_view"
app:layout_constraintStart_toStartOf="@id/educational_filter_view"/>
<View
android:id="@+id/shops_filter_left_border"
android:layout_width="1dp"
android:layout_height="0dp"
android:background="@color/filterUnactivatedColor"
app:layout_constraintTop_toTopOf="@id/shops_filter_view"
app:layout_constraintBottom_toTopOf="@id/public_filter_view"
app:layout_constraintStart_toStartOf="@id/shops_filter_view"/>
<View
android:id="@+id/public_filter_left_border"
android:layout_width="1dp"
android:layout_height="0dp"
android:background="@color/filterUnactivatedColor"
app:layout_constraintTop_toTopOf="@id/public_filter_view"
app:layout_constraintBottom_toBottomOf="@id/public_filter_view"
app:layout_constraintStart_toStartOf="@id/public_filter_view"/>
<View
android:id="@+id/shops_filter_right_border"
android:layout_width="1dp"
android:layout_height="0dp"
android:background="@color/filterUnactivatedColor"
app:layout_constraintTop_toTopOf="@id/shops_filter_view"
app:layout_constraintBottom_toBottomOf="@id/shops_filter_view"
app:layout_constraintEnd_toEndOf="@id/shops_filter_view"/>
<View
android:id="@+id/public_filter_right_border"
android:layout_width="1dp"
android:layout_height="0dp"
android:background="@color/filterUnactivatedColor"
app:layout_constraintTop_toTopOf="@id/public_filter_view"
app:layout_constraintBottom_toBottomOf="@id/public_filter_view"
app:layout_constraintEnd_toEndOf="@id/public_filter_view"/>
<View
android:id="@+id/first_border_center_pixel"
android:layout_width="1dp"
android:layout_height="1dp"
android:background="@color/filterUnactivatedColor"
app:layout_constraintStart_toEndOf="@id/all_filter_bottom_border"
app:layout_constraintBottom_toBottomOf="@id/all_filter_bottom_border" />
<View
android:id="@+id/second_border_center_pixel"
android:layout_width="1dp"
android:layout_height="1dp"
android:background="@color/filterUnactivatedColor"
app:layout_constraintStart_toEndOf="@id/stay_filter_bottom_border"
app:layout_constraintBottom_toBottomOf="@id/stay_filter_bottom_border" />
<View
android:id="@+id/third_border_center_pixel"
android:layout_width="1dp"
android:layout_height="1dp"
android:background="@color/filterUnactivatedColor"
app:layout_constraintStart_toEndOf="@id/restaurants_filter_bottom_border"
app:layout_constraintBottom_toBottomOf="@id/restaurants_filter_bottom_border" />
<View
android:id="@+id/fourth_border_center_pixel"
android:layout_width="1dp"
android:layout_height="1dp"
android:background="@color/filterUnactivatedColor"
app:layout_constraintEnd_toEndOf="@id/shops_filter_bottom_border"
app:layout_constraintBottom_toBottomOf="@id/shops_filter_bottom_border" />
</android.support.constraint.ConstraintLayout>
应该不惜一切代价避免，它很麻烦，笨拙且容易搞砸Calendar循环仅在年份相同的情况下循环，因此它完全忽略while endDate是可变的，因此您生成的所有内容都是Calendar，其中包含相同的日期/时间值由于Java 8包含更新的Date / Time API，因此您应该开始使用它。如果您不使用Java 8+（并且我会问一些严重的问题，为什么不这样做），您应该使用更可靠的API - JodaTime浮现在脑海中，但也有一个{{ 3}}
现在，说了这么多，我做的更像是......
List事实上，我甚至会更改它，以便呼叫者必须通过public List<LocalDate> findWeekendsBetween(long startTime, long endTime) {
LocalDate startDate = LocalDate.ofEpochDay(startTime);
LocalDate endDate = LocalDate.ofEpochDay(endTime);
System.out.println("Starting from " + startDate);
System.out.println("Ending at " + endDate);
List<LocalDate> weekends = new ArrayList<>(25);
while (startDate.isBefore(endDate) || startDate.equals(endDate)) {
switch (startDate.getDayOfWeek()) {
case SATURDAY:
weekends.add(startDate);
startDate = startDate.plusDays(2);
break;
default:
startDate = startDate.plusDays(1);
}
}
return weekends;
}
个值...
LocalDate public List<LocalDate> findWeekendsBetween(LocalDate startDate, LocalDate endDate) {
不明确。
上述算法包含long和startTime，并考虑周末＆＃34;是＆＃34;星期五和＃34;之间的时间和＆＃34;星期一＆＃34;，所以它只会返回＆＃34;星期六＆＃34;值
然后你可以使用像......这样的东西来调用它。
endTime（正如您所见，我懒得计算一个固定的时间点并使用LocalDate startDate = LocalDate.now();
LocalDate endDate = startDate.plusMonths(1);
List<LocalDate> weekends = findWeekendsBetween(startDate.toEpochDay(), endDate.toEpochDay());
System.out.println("Found " + weekends.size() + " Saturday/Sundays");
for (LocalDate date : weekends) {
System.out.println(date);
}
并将其转换为LocalDate值）
在我的测试中打印出类似......的内容。
long但是你只添加了星期六，它也必须是星期日。
是的，正如我所说，我只接受Starting from 2018-01-09
Ending at 2018-02-09
Found 4 Weekends
2018-01-13
2018-01-20
2018-01-27
2018-02-03
，对我而言，周末包含Saturday和Saturday。
只需将Sunday包含在SUNDAY声明中即可轻松修复...
switch我认为，它可能是52 * 2 = 104列表大小。
我没有测试一整年，我只检查了一个月的价值。你可以改变结束日期，比如......
switch (startDate.getDayOfWeek()) {
case SATURDAY:
case SUNDAY:
weekends.add(startDate);
break;
default:
startDate = startDate.plusDays(1);
}