private long addProductShown() {
    // lấy giá trị
    Product product = (Product) mSpinner_Product.getSelectedItem();
    long productId = product.get_id();
    int number = Integer.valueOf(mInputLayout_Number.getEditText().getText() + "");
    long retailPrice = Long.valueOf(mInputLayout_RetailPrice.getEditText().getText() + "");

    // gán giá trị
    mProductShown = new ProductShown();

    mProductShown.setAssignId(mAssignId);
    mProductShown.setProductId(productId);
    mProductShown.setNumber(number);
    mProductShown.setRetailPrice(retailPrice);

    mProductShown.setSessionCode(DatabaseUtil.getCodeGenerationByTime());
    mProductShown.setCreateBy(UserPref.getUserPrefId(this));
    mProductShown.setCreateAt(Calendar.getInstance());
    mProductShown.setUploadStatus(UploadStatus.WAITING_UPLOAD);

    long id = ProductShownData.add(this, mProductShown);
    mProductShown.set_id(id);

    return id;
  }