public void updateCart() {
Log.d(LOG_TAG, "updateCart");
cart = DataManager.getInstance().my_cart;
setTotalPrice();
products_list.clear();
products_list.addAll(cart.products);
lv_cart_list.invalidateViews();
((BaseAdapter) lv_cart_list.getAdapter()).notifyDataSetChanged();
}

private String LOG_TAG = getClass().getSimpleName();
private CartFragment cartFragment;
private GiftsActivity activity;
private List<Product> products_list = new LinkedList<>();
private LayoutInflater inflater;


public CartAdapter(CartFragment mContext, List<Product> products) {
    super();
    activity = (GiftsActivity) mContext.getActivity();
    cartFragment = mContext;
    products_list = products;
    inflater = (LayoutInflater) activity
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}

@Override
public int getCount() {
    return products_list.size();
}

@Override
public Object getItem(int position) {
    return products_list.get(position);
}

@Override
public long getItemId(int position) {
    return position;
}

static class ViewHolder {
    ImageView iv_cart_item;
    TextView tv_cart_item_name;
    TextView tv_price;
    TextView tv_discount_price;
    Spinner sp_quatity_of_order;
    ImageButton ib_delete_item_from_cart;
    RelativeLayout rl_item_package;
    ImageView iv_current_package;
    TextView tv_package_title;
    TextView tv_size;
    TextView tv_package_price;
    TextView tv_package_discount_price;
    ImageButton ib_delete_package_from_item;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    ViewHolder viewHolder;
    final Product product = products_list.get(position);
    String image_url = Constants.SERVER_HOST + "/" + product.image;
    if (convertView == null) {
        convertView = inflater.inflate(R.layout.cart_item, parent, false);

        viewHolder = new ViewHolder();
        viewHolder.iv_cart_item = (ImageView) convertView.findViewById(R.id.iv_cart_item);
        viewHolder.tv_cart_item_name = (TextView) convertView.findViewById(R.id.tv_cart_item_name);
        viewHolder.tv_price = (TextView) convertView.findViewById(R.id.tv_price);
        viewHolder.tv_discount_price = (TextView) convertView.findViewById(R.id.tv_discount_price);
        viewHolder.sp_quatity_of_order = (Spinner) convertView.findViewById(R.id.sp_quatity_of_order);
        viewHolder.ib_delete_item_from_cart = (ImageButton) convertView.findViewById(R.id.ib_delete_item_from_cart);
        viewHolder.rl_item_package = (RelativeLayout) convertView.findViewById(R.id.rl_item_package);
        viewHolder.iv_current_package = (ImageView) convertView.findViewById(R.id.iv_current_package);
        viewHolder.tv_package_title = (TextView) convertView.findViewById(R.id.tv_package_title);
        viewHolder.tv_size = (TextView) convertView.findViewById(R.id.tv_size);
        viewHolder.tv_package_price = (TextView) convertView.findViewById(R.id.tv_package_price);
        viewHolder.tv_package_discount_price = (TextView) convertView.findViewById(R.id.tv_package_discount_price);
        viewHolder.ib_delete_package_from_item = (ImageButton) convertView.findViewById(R.id.ib_delete_package_from_item);

        Typeface bold = Typeface.createFromAsset(activity.getAssets(), "fonts/Exo2Bold.ttf");
        viewHolder.tv_cart_item_name.setTypeface(bold);
        viewHolder.tv_price.setTypeface(bold);
        viewHolder.tv_discount_price.setTypeface(bold);
        viewHolder.tv_package_title.setTypeface(bold);

        convertView.setTag(viewHolder);


        int stock_quantity = Integer.parseInt(product.stock_quantity);
        ArrayList<String> spinner_array = initSpinnerArray(stock_quantity);
        ArrayAdapter<String> adapter = new ArrayAdapter<>(activity, android.R.layout.simple_spinner_item,
                spinner_array);
        viewHolder.sp_quatity_of_order.setAdapter(adapter);
        int quantity = Integer.parseInt(product.quantity);
        boolean isQuantityLessStockQuantity = isQuantityLessStockQuantity(stock_quantity, quantity);
        if (isQuantityLessStockQuantity) {
            viewHolder.sp_quatity_of_order.setSelection(quantity - 1);
        }
        viewHolder.sp_quatity_of_order.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
                int quantity = i + 1;
                String quantity_param = String.valueOf(quantity);
                if (product.product_package == null) {
                    ApiClient.getInstance(activity).changeProductQuantity(product.product_id, quantity_param, null, null, null);
                    Log.d(LOG_TAG, "changeProductQuantity package == null");
                    DataManager.getInstance().is_updating_cart = true;
                } else {
                    ApiClient.getInstance(activity).changeProductQuantity(product.product_id, quantity_param, null,
                            product.product_package.package_product_id, product.product_package.package_product_value_id);
                    Log.d(LOG_TAG, "changeProductQuantity");
                    DataManager.getInstance().is_updating_cart = true;
                }

            }

            @Override
            public void onNothingSelected(AdapterView<?> adapterView) {

            }
        });

        viewHolder.ib_delete_item_from_cart.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (product.product_package == null) {
                    ApiClient.getInstance(activity).removeProductFromcart(product.product_id, null, null);
                    DataManager.getInstance().is_updating_cart = true;
                } else {
                    ApiClient.getInstance(activity).removeProductFromcart(product.product_id,
                            product.product_package.package_product_id,
                            product.product_package.package_product_value_id);
                    DataManager.getInstance().is_updating_cart = true;
                }
            }
        });

        viewHolder.ib_delete_package_from_item.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                ApiClient.getInstance(activity).removePackageFromProduct(product.product_id,
                        product.product_package.package_product_id,
                        product.product_package.package_product_value_id);
                DataManager.getInstance().is_updating_cart = true;
            }
        });
        boolean hasPackage = isProductPacked(product);
        Log.d(LOG_TAG, "hasPackage = " + hasPackage);
        if (hasPackage) {
            viewHolder.rl_item_package.setVisibility(View.VISIBLE);

            setProductValues(product, viewHolder.tv_cart_item_name, viewHolder.tv_price,
                    viewHolder.tv_discount_price, viewHolder.sp_quatity_of_order);
            setPackageValues(product.product_package, viewHolder.tv_package_title, viewHolder.tv_size,
                    viewHolder.tv_package_price, viewHolder.tv_package_discount_price);

            loadProductImages(product, viewHolder.iv_cart_item);
            loadPackageImages(product.product_package, viewHolder.iv_current_package);
        } else {
            Log.d(LOG_TAG, "hasPackage = " + hasPackage);
            viewHolder.rl_item_package.setVisibility(View.GONE);
            setProductValues(product, viewHolder.tv_cart_item_name, viewHolder.tv_price,
                    viewHolder.tv_discount_price, viewHolder.sp_quatity_of_order);

            loadProductImages(product, viewHolder.iv_cart_item);
        }
    } else {
        viewHolder = (ViewHolder) convertView.getTag();
    }
    return convertView;
}

private boolean isQuantityLessStockQuantity(int stock_quantity, int quantity) {
    if (stock_quantity >= quantity) {
        return true;
    } else {
        return false;
    }
}

private ArrayList<String> initSpinnerArray(int product_quantity) {
    Log.d(LOG_TAG, "product_quantity  = " + product_quantity);
    ArrayList<String> spinner_array = new ArrayList<>();
    for (int j = 0; j < product_quantity; j++) {
        spinner_array.add(j, String.valueOf(j + 1) + " шт.");
    }
    return spinner_array;
}

private boolean isDiscount(String discount_price) {
    Log.d(LOG_TAG, "discount_price = " + discount_price);
    if (!discount_price.equals("0"))
        return true;
    else
        return false;
}

private void setPackageValues(ProductPackage product_package, TextView tv_package_title, TextView tv_size,
                              TextView tv_package_price, TextView tv_package_discount_price) {
    setPrices(product_package, tv_package_price, tv_package_discount_price);
    tv_package_title.setText(product_package.name);
    tv_size.setText(product_package.value);
    tv_package_price.setText(product_package.price);
}

private void setProductValues(Product product, TextView tv_cart_item_name, TextView tv_price, TextView tv_discount_price,
                              Spinner sp_quatity_of_order) {
    setPrices(product, tv_price, tv_discount_price);
    tv_cart_item_name.setText(product.name);
}

private void loadProductImages(Product product, ImageView iv_cart_item) {
    String product_image_url = Constants.SERVER_HOST + "/" + product.image;
    Log.d(LOG_TAG, "product_image_url = " + product_image_url);
    Glide.with(activity).load(product_image_url).into(iv_cart_item);
}

private void loadPackageImages(ProductPackage product_package, ImageView iv_current_package) {
    String product_package_image_url = Constants.SERVER_HOST + "/" + product_package.image;
    Glide.with(activity).load(product_package_image_url).into(iv_current_package);
}

private boolean isProductPacked(Product product) {
    if (product.product_package != null)
        return true;
    else
        return false;
}

private void setPrices(Product product, TextView price, TextView discount_price) {

    boolean is_discount = isDiscount(product.discount_price);
    Log.d(LOG_TAG, "is_discount = " + is_discount);

    if (is_discount) {
        String old_price = (product.price + Constants.UAH);
        int i = old_price.length();
        price.setText(old_price);
        price.setTextColor(activity.getResources().getColor(R.color.catalog_oldprice_color));
        price.setGravity(Gravity.CENTER);
        discount_price.setText(product.discount_price + Constants.UAH);
        discount_price.setGravity(Gravity.CENTER);
        SpannableStringBuilder sp = new SpannableStringBuilder(old_price);
        sp.setSpan(new StrikethroughSpan(), 0, i, SpannableStringBuilder.SPAN_EXCLUSIVE_EXCLUSIVE);
        price.setText(sp);
        price.setTextSize(16);
        discount_price.setTextSize(22);
    } else {
        discount_price.setText(product.price + Constants.UAH);
        price.setVisibility(View.GONE);
        discount_price.setGravity(Gravity.CENTER_HORIZONTAL);
        discount_price.setTextSize(22);
        discount_price.setGravity(Gravity.CENTER);
    }
}

private void setPrices(ProductPackage product, TextView price, TextView discount_price) {

    boolean is_discount = isDiscount(product.discount_price);

    Log.d(LOG_TAG, "is_discount = " + is_discount);

    if (is_discount) {
        String old_price = (product.price + Constants.UAH);
        int i = old_price.length();
        price.setText(old_price);
        price.setTextColor(activity.getResources().getColor(R.color.catalog_oldprice_color));
        price.setGravity(Gravity.CENTER);
        discount_price.setText(product.discount_price + Constants.UAH);
        discount_price.setGravity(Gravity.CENTER);
        SpannableStringBuilder sp = new SpannableStringBuilder(old_price);
        sp.setSpan(new StrikethroughSpan(), 0, i, SpannableStringBuilder.SPAN_EXCLUSIVE_EXCLUSIVE);
        price.setText(sp);
        price.setTextSize(12);
        discount_price.setTextSize(18);
    } else {
        discount_price.setText(product.price + Constants.UAH);
        price.setVisibility(View.GONE);
        discount_price.setGravity(Gravity.CENTER_HORIZONTAL);
        discount_price.setTextSize(18);
        discount_price.setGravity(Gravity.CENTER);
    }
}