android studio实现购物车的代码

您好，以下是针对 Android Studio 实现购物车的代码示例：

1. 在 build.gradle 中添加以下依赖：

implementation 'androidx.cardview:cardview:1.0.0'
implementation 'androidx.recyclerview:recyclerview:1.0.0'

2. 创建一个 RecyclerView 来显示购物车列表：

<androidx.recyclerview.widget.RecyclerView
    android:id="@+id/rv_shopping_cart"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>

3. 创建一个适配器类，用于将商品数据显示在 RecyclerView 中：

public class ShoppingCartAdapter extends RecyclerView.Adapter<ShoppingCartAdapter.ViewHolder> {
    private List<Product> products;
    private Context context;

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

    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_product, parent, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
        Product product = products.get(position);
        holder.tvProductName.setText(product.getName());
        holder.tvProductPrice.setText("$" + product.getPrice());
        holder.btnAddToCart.setVisibility(View.GONE);
    }

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

    public static class ViewHolder extends RecyclerView.ViewHolder {
        TextView tvProductName, tvProductPrice;
        Button btnAddToCart;

        public ViewHolder(View itemView) {
            super(itemView);
            tvProductName = itemView.findViewById(R.id.tv_product_name);
            tvProductPrice = itemView.findViewById(R.id.tv_product_price);
            btnAddToCart = itemView.findViewById(R.id.btn_add_to_cart);
        }
    }
}

4. 在 activity 中创建一个列表，并初始化适配器：

List<Product> products = new ArrayList<>();
products.add(new Product("Apple", 1.99));
products.add(new Product("Banana", 0.99));
products.add(new Product("Orange", 0.49));

RecyclerView rvShoppingCart = findViewById(R.id.rv_shopping_cart);
rvShoppingCart.setLayoutManager(new LinearLayoutManager(this));
ShoppingCartAdapter adapter = new ShoppingCartAdapter(this, products);
rvShoppingCart.setAdapter(adapter);

这样就完成了一个简单的购物车实现，希望能对您有所帮助。