public static void checkSku(String sku) {
        String[] skuParts = sku.split("/");
        if (skuParts.length != 2) {
            throw new IllegalArgumentException("Samsung SKU must contain ITEM_GROUP_ID and ITEM_ID.");
        }
        for (int i = 0; i < skuParts.length; i++) {
            if (!TextUtils.isDigitsOnly(skuParts[i])) {
                if (i == 0) {
                    throw new IllegalArgumentException("Samsung SKU must contain numeric ITEM_GROUP_ID.");
                } else if (i == 1) {
                    throw new IllegalArgumentException("Samsung SKU must contain numeric ITEM_ID.");
                }
            }
        }
    }