java 如何获取两个日期之间的日期列表？
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How to get list of dates between two dates?
提问by Avan
In my application user should select date from listview. The problem is generating this list. For example I need all dates between 2010-2013or June-August(period maybe day, month, year). Is there any method that allows to get that data?
在我的应用程序中，用户应该从listview. 问题是生成这个列表。例如，我需要2010-2013或6-8月之间的所有日期（期间可能是日、月、年）。是否有任何方法可以获取该数据？
Example: I need dates between 01.01.2013 - 10.01.2013
示例：我需要01.01.2013 - 10.01.2013之间的日期
- 01.01.2013
- 02.01.2013
- 03.01.2013
- 04.01.2013
- 05.01.2013
- 06.01.2013
- 07.01.2013
- 08.01.2013
- 09.01.2013
- 10.01.2013
- 01.01.2013
- 02.01.2013
- 03.01.2013
- 04.01.2013
- 05.01.2013
- 06.01.2013
- 07.01.2013
- 08.01.2013
- 09.01.2013
- 10.01.2013
Thanks in advance
提前致谢
回答by Jon Skeet
For a listyou could just do:
对于列表，您可以这样做：
public static List<LocalDate> datesBetween(LocalDate start, LocalDate end) {
List<LocalDate> ret = new ArrayList<LocalDate>();
for (LocalDate date = start; !date.isAfter(end); date = date.plusDays(1)) {
ret.add(date);
}
return ret;
}
Note, that will include end. If you want it to excludethe end, just change the condition in the loop to date.isBefore(end).
请注意，这将包括end. 如果您希望它排除结尾，只需将循环中的条件更改为date.isBefore(end).
If you only need an Iterable<LocalDate>you could write your own class to do this very efficiently rather than building up a list. You could do this with an anonymous class, if you didn't mind a fair degree of nesting. For example (untested):
如果您只需要一个，Iterable<LocalDate>您可以编写自己的类来非常有效地执行此操作，而不是建立一个列表。如果您不介意一定程度的嵌套，您可以使用匿名类来执行此操作。例如（未经测试）：
public static Iterable<LocalDate> datesBetween(final LocalDate start,
final LocalDate end) {
return new Iterable<LocalDate>() {
@Override public Iterator<LocalDate> iterator() {
return new Iterator<LocalDate>() {
private LocalDate next = start;
@Override
public boolean hasNext() {
return !next.isAfter(end);
}
@Override
public LocalDate next() {
if (next.isAfter(end)) {
throw NoSuchElementException();
}
LocalDate ret = next;
next = next.plusDays(1);
return ret;
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
};
}
};
}
回答by curlyreggie
Use a DatePickerFragment like this:
使用这样的DatePicker片段：
private static class DatePickerFragment extends DialogFragment
implements DatePickerDialog.OnDateSetListener {
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
// Use the current date as the default date in the picker
final Calendar c = Calendar.getInstance();
int year = c.get(Calendar.YEAR);
int month = c.get(Calendar.MONTH);
int day = c.get(Calendar.DAY_OF_MONTH);
// Create a new instance of DatePickerDialog and return it
return new DatePickerDialog(getActivity(), this, year, month, day);
}
@Override
public void onDateSet(DatePicker view, int year, int monthOfYear,
int dayOfMonth) {
// Copy the Date to the EditText set.
dateValue = String.format("%04d", year) + "-" + String.format("%02d", monthOfYear + 1) + "-" + String.format("%02d", dayOfMonth);
}
}
This should be easier to get dates in the first place. Use the below code for Date Ranges:
首先，这应该更容易获取日期。对日期范围使用以下代码：
public static List<Date> dateInterval(Date initial, Date final) {
List<Date> dates = new ArrayList<Date>();
Calendar calendar = Calendar.getInstance();
calendar.setTime(initial);
while (calendar.getTime().before(final)) {
Date result = calendar.getTime();
dates.add(result);
calendar.add(Calendar.DATE, 1);
}
return dates;
}
Cheers!
干杯!
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