MaterialDatePicker callbacks lost on orientation change

Hi, due to Androids “weird” handling of rotation changes the callbacks of the MaterialDatePicker are “lost” after orientation change.

Because the MaterialDatePicker ist final there is no way to extend it and override it and handle the click in my own code. A good way would be to change this:

confirmButton.setOnClickListener(
        new View.OnClickListener() {
          @Override
          public void onClick(View v) {
            for (MaterialPickerOnPositiveButtonClickListener<? super S> listener :
                onPositiveButtonClickListeners) {
              listener.onPositiveButtonClick(getSelection());
            }
            dismiss();
          }
        });

to sth like

confirmButton.setOnClickListener(
        new View.OnClickListener() {
          @Override
          public void onClick(View v) {
               onOkClick();
          }
        });

and add a function

public void onOkClick(){
            for (MaterialPickerOnPositiveButtonClickListener<? super S> listener :
                onPositiveButtonClickListeners) {
              listener.onPositiveButtonClick(getSelection());
            }
            dismiss();
}

And make MaterialDatePicker NOT final this way i could extend it and:

@Override
public void onOkClick(){
     //save new date to my database
    super.onOkClick();
}

I’m pretty sure that’s a much more elegant solution than either

• disable orientation changes while dialog is opened
• check in my activity after orientation change if the dialog is opened and reattach my callback

[ymarian]

We cannot serialize the listeners to retain them.

Since the dialog is going to be recreated on a config change, you can find the fragment by the tag set when calling show.

Just reset the listeners in onResume or when appropriate:

MaterialDatePicker datepicker  = (MaterialDatePicker) supportFragmentManager.findFragmentByTag("tag");
// reset listeners

[Rajarml]

@Nailik does it resolve the lost listeners issue after a config change like device rotation?