Question

这是我传递产品的适配器。

public class AdapterShoppingCartItem extends BaseAdapter {
    private Context context;
    private ArrayList<Product> products = new ArrayList();

    public AdapterShoppingCartItem(Context context, ArrayList<Product> products) {
        this.context = context;
        this.products = products;
    }

    /*private view holder class*/
    private class ViewHolder {
        ImageView imageView;
        TextView productName;
        TextView productMrp;
        TextView productSellPrice;
        TextView productItemInCart;
        TextView productTotal;
        Button plusButton;
        Button minusButton;
    }


    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder = null;

        LayoutInflater mInflater = (LayoutInflater)
                context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
        if (convertView == null) {
            convertView = mInflater.inflate(R.layout.listview_shopping_cart_item, null);
            holder = new ViewHolder();
            holder.productName = (TextView) convertView.findViewById(R.id.productName);
            holder.productMrp = (TextView) convertView.findViewById(R.id.mrp);
            holder.productSellPrice = (TextView) convertView.findViewById(R.id.sellPrice);
            holder.productItemInCart = (TextView) convertView.findViewById(R.id.quantity);
            holder.productTotal = (TextView) convertView.findViewById(R.id.total);
            holder.plusButton = (Button) convertView.findViewById(R.id.plusButton);

            holder.minusButton = (Button) convertView.findViewById(R.id.minusButton);

            holder.minusButton.setOnClickListener(new View.OnClickListener(){
                @Override
                public void onClick(View v) {
                    Utility.displayToast("minus");
                }
            });

            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        final Product product = (Product) getItem(position);
        if (product != null) {
            ArrayList<ProductVariant> productVariants = product.getProductVariants();
            for(int j=0; j<productVariants.size(); ++j){
                final ProductVariant productVariant = productVariants.get(j);
                if(productVariant.getInCart() > 0){

                    String productName = product.getProductName()
                            + " " + productVariant.getVariant().getVariantName();

                    holder.productName.setText(productName);

                    BigDecimal mrp = productVariant.getMrp();
                    holder.productMrp.setText(mrp.toString());

                    BigDecimal sellPrice = productVariant.getSellPrice();
                    holder.productSellPrice.setText(sellPrice.toString());

                    int quantity = productVariant.getInCart();
                    holder.productItemInCart.setText(Integer.toString(quantity));

                    Payment payment = new Payment();
                    BigDecimal total = payment.calculateCost(quantity, sellPrice);


                    holder.plusButton.setOnClickListener(new View.OnClickListener() {
                        @Override
                        public void onClick(View v) {

                            productVariant.setInCart(1 + productVariant.getInCart());
                            notifyDataSetChanged();
                            Utility.displayToast("plus");

                        }
                    });



                }
            }




            //if (holder.imageView != null) {
                //new Utility.ImageDownloaderTask(holder.imageView).execute(String.valueOf(brand.getBrandImagePath()));
            //}
            //holder.imageView.setText(brand.getBrandImagePath());
        } else {
            Toast.makeText(context, "shoppingCartItem is null", Toast.LENGTH_SHORT).show();
        }

        return convertView;
    }

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

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

    @Override
    public long getItemId(int position) {
        return products.indexOf(getItem(position));
    }
}

我只是想显示那些购物车中任何一个变量超过0的产品。但我的上述逻辑显示了很多空行，即使我保留了条件。

有人可以帮助解决逻辑错误吗？如何解决？

Answer 1

删除For循环int getView（）方法。正如您在getCount（）中提到的产品大小。使用getview方法中的位置值循环显示Productvariant并显示带有购物车计数条件的项目。

    ArrayList<ProductVariant> productVariants = product.getProductVariants();

     final ProductVariant productVariant = productVariants.get(position);
    if(productVariant.getInCart()>0)               
     {
  convertView.setVisibility(View.VISIBLE);                      
  String productName = product.getProductName()
                                + " " + productVariant.getVariant().getVariantName();

                        holder.productName.setText(productName);

                        BigDecimal mrp = productVariant.getMrp();
                        holder.productMrp.setText(mrp.toString());

                        BigDecimal sellPrice = productVariant.getSellPrice();
                        holder.productSellPrice.setText(sellPrice.toString());

                        int quantity = productVariant.getInCart();
                        holder.productItemInCart.setText(Integer.toString(quantity));

                        Payment payment = new Payment();
                        BigDecimal total = payment.calculateCost(quantity, sellPrice);


                        holder.plusButton.setOnClickListener(new View.OnClickListener() {
                            @Override 
                            public void onClick(View v) {

                                productVariant.setInCart(1 + productVariant.getInCart());
                                notifyDataSetChanged();
                                Utility.displayToast("plus");
     }
else
{
convertView.setVisibility(View.GONE);
}

在listView android中显示空行并重复行

1 个答案: