DinnerDialogFragment.java

    public static DinnerDialogFragment newInstance(long date, Dinner dinner) {
        DinnerDialogFragment f = new DinnerDialogFragment();

        Bundle args = new Bundle();
        args.putLong("date", date);

        if (dinner != null) {
            args.putLong("dinnerId", dinner.getId());
            args.putLong("mealId", dinner.getMeal().getId());
            args.putString("mealName", dinner.getMeal().getName());
        }

        f.setArguments(args);

        return f;
    }