MealIngredientContract.java

    public String getShoppingList(List<Meal> meals, SQLiteOpenHelper helper) {

        ArrayList<String> array_list = new ArrayList<>();

        String[] queryArgs = getMealIds(meals);
        String query = getShoppingListQuery(meals);

        SQLiteDatabase db = helper.getReadableDatabase();
        Cursor res = db.rawQuery(query, queryArgs);

        if (res != null && res.getCount() > 0) {
            res.moveToFirst();

            do {
                String name = res.getString(0);
                int count = res.getInt(1);
                array_list.add(count + " x " + name + "\n");
            } while (res.moveToNext());
        }

        db.close();
        return TextUtils.join("\n", array_list);
    }