Android Dialog Interface

public class LineUpDetailDialog extends DialogFragment {
    public interface DetailDialogListener {
        void onConcertInCustomLineUpChanged(int wpId);
        void onDismiss();
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        parentFragment = getArguments().getString(bundleParentFragmentKey);
        try {
            Fragment fragment = activity.getSupportFragmentManager().findFragmentByTag(parentFragment);
            listener = (DetailDialogListener) fragment;
        }catch (Exception e){
            Crashlytics.logException(e);
        }
    }
}
// --------------------------------------------------
public class PageLineUp extends LoadingFragment implements LineUpDetailDialog.DetailDialogListener{¨
    ...
}