问题 I have a date picker dialog which works perfectly on android 9 and android 10, I decided to test on android 5.1.1, and after selecting a date, nothing happens, the onDateSet() doesn't fire up, I've read at least 10 articles on SO that refer to similar problems, but can't find a working solution Here's my code, maybe someone could point out what i'm doing wrong DateDialog.java public class DateDialog extends DialogFragment { DatePickerDialog.OnDateSetListener mOnDateSetListener; public static