我想从DatePickerDialog迁移到MaterialDatePicker。从MaterialDatePicker调用getDialog时遇到问题,对话框结果始终为 null。
这是一个错误,还是MaterialDatePicker不支持该功能?
日期选择器对话框
private static class BirthDateUpdater extends DialogFragment implements DatePickerDialog.OnDateSetListener {
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
// create calendar instance
final Calendar c = Calendar.getInstance();
// set calendar to birthdate
c.setTimeInMillis(getBirthDate().getTime());
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);
}
public void onDateSet(DatePicker view, int year, int month, int day) {
// process date selected in here
}
}
这里的MaterialDatePicker问题 - picker.getDialog() 的结果总是为空?
public static class BirthDateUpdater extends DialogFragment implements
MaterialPickerOnPositiveButtonClickListener<Long>,
DialogInterface.OnCancelListener {
private Dialog dialog;
public BirthDateUpdater() {
}
@NonNull
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
try {
// builder
MaterialDatePicker.Builder<Long> builder = MaterialDatePicker.Builder.datePicker();
builder.setTitleText("Select Date");
// set date to BirthDate
builder.setSelection(getBirthDate().getTime());
// picker
MaterialDatePicker<Long> picker = builder.build();
// add event
picker.addOnPositiveButtonClickListener(this);
picker.addOnCancelListener(this);
// dialog
dialog = picker.getDialog(); // error in here (dialog is null)?
} catch (Exception ex) {
ex.printStackTrace();
}
return dialog;
}
@Override
public void onPositiveButtonClick(Long selection) {
try {
Calendar dateSelected = Calendar.getInstance();
dateSelected.setTimeInMillis(selection);
// process date selected in here
} catch (Exception ex) {
ex.printStackTrace();
}
}
@Override
public void onCancel(@NonNull DialogInterface dialog) {
dialog.dismiss();
}
}