setMinDate(…) for DatePicker doesn't work when invoked a second time

问题

I'm in a particular situation in which I have to alter the min and max date of DatePicker according to the selected element of a Spinner. Here's the chunk of code I'm using to switch min and max date.

private void switchCalculationMethod(int method) {
    calculationMethod = method;
    switch (method) {
        case METHOD_1:
            datePicker.setMinDate(new LocalDate().minusWeeks(42).getMillis());
            datePicker.setMaxDate(new LocalDate().plusDays(1).getMillis() - 1);
            break;
        case METHOD_2:
            datePicker.setMinDate(new LocalDate().minusWeeks(2).getMillis()); // This don't work!!
            datePicker.setMaxDate(new LocalDate().plusWeeks(40).getMillis()); // This works!!!
            break;
    }
    datePicker.init(today.getYear(), today.getMonthOfYear() - 1,
            today.getDayOfMonth(), this);
}

So, the DatePicker would get set up correctly the first time, problem occurs when I attempt to change the min date again (changing max date works). It would remain at the value I had set first. I'm thinking this is a bug. Am I doing something wrong here? Is there a workaround for this?.

PS : I'm using Joda time api.

回答1:

This happens because method setMinDate() has check

 if (mTempDate.get(Calendar.YEAR) == mMinDate.get(Calendar.YEAR)
                && mTempDate.get(Calendar.DAY_OF_YEAR) != mMinDate.get(Calendar.DAY_OF_YEAR){
            return;
 }

Simple workaround is to set min date with different year at first, for example

mPicker.setMinDate(0);

mPicker.setMinDate(new LocalDate().minusWeeks(2)
                                .toDateTimeAtStartOfDay().getMillis());

It works for me.

回答2:

As said above, you can bypass the check by calling those before actually changing the value:

setMinDate(0);
setMaxDate(Long.MAX_VALUE);

If you want to reset the minimum or maximum value to its default, you can use the following values:

setMinDate(-2208902400000L);  // Jan 1, 1900
setMaxDate(4102531200000L);  // Jan 1, 2100

回答3:

first update setMinDate to 0 after then setMinDate according to you dateobject

mPicker.setMinDate(0);

mPicker.setMinDate(datepickerObject.getTimeInMillis());

回答4:

mPicker.setMinDate(0);

doesn't work for me.

Try to reinitialize the picker.

mPicker = new DatePickerDialog(..)

来源：https://stackoverflow.com/questions/19616575/setmindate-for-datepicker-doesnt-work-when-invoked-a-second-time

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android

date

time

android-ui