How to correctly save dialog fragment's state containing parent fragment reference in callback?

Issue

Constructor (note ListPickerHandler)

public StarredListPickerDialogFragment(ListPickerHandler h) {
        handler = h;
        mSelectedItems = new ArrayList<StarredList>();
    }

this is how I call parent fragment methods (defined implementing ListPickerHandler interface)

 alertDialog.setOnShowListener(new DialogInterface.OnShowListener() {
            @Override
            public void onShow(DialogInterface dialog) {
                Button negative = alertDialog.getButton(AlertDialog.BUTTON_NEGATIVE);
                Button positive = alertDialog.getButton(AlertDialog.BUTTON_POSITIVE);
                positive.setEnabled(false);
                negative.setOnClickListener(new View.OnClickListener() {

                    @Override
                    public void onClick(View view) {
                        handler.onNegativeButtonAction(mSelectedItems);
                    }
                });
                positive.setOnClickListener(new View.OnClickListener() {

                    @Override
                    public void onClick(View view) {
                        handler.onPositiveButtonAction(mSelectedItems);
                    }
                });
            }
        });

Now troubles come when android os calls onSaveInstanceState(). Handler is no more defined and I actually have no clues to handle this situation..

Solution

solved by casting (when bundle is not null) the parent fragment to ListPickerHandler which is the interface implemented by the invoking fragment

Answered By - Francesco Donzello