public class Dialog extends AppCompatDialogFragment {

    DialogListener mListener;
    private String color
   //Some code


    @Override
    public void onAttach(Context context) {

        super.onAttach(context);
        try {
            mListener = (DialogListener) getActivity();
        } catch (ClassCastException e) {
            throw new ClassCastException(getActivity().toString() + MUST_IMPLEMENT_INTERFACE_MESSAGE);
        }
    }



    private void returnResult() {


 //Some code
            mListener.onButtonClick(color);

    }

    public interface DialogListener {

        void onButtonClick(String color);

    }
}