android编辑购物车,Android制作简单的普通购物车代码

编辑购物车需要先设计好购物车的数据结构，通常包括商品名称、价格、数量、图片等信息。下面是一个简单的 Android 购物车代码示例：

1. 创建一个商品类

public class Product {
    private String name;
    private double price;
    private int quantity;
    private int image;

    public Product(String name, double price, int quantity, int image) {
        this.name = name;
        this.price = price;
        this.quantity = quantity;
        this.image = image;
    }

    public String getName() {
        return name;
    }

    public double getPrice() {
        return price;
    }

    public int getQuantity() {
        return quantity;
    }

    public int getImage() {
        return image;
    }

    public void setQuantity(int quantity) {
        this.quantity = quantity;
    }
}

2. 创建一个购物车类

public class ShoppingCart {
    private List<Product> productList;

    public ShoppingCart() {
        productList = new ArrayList<>();
    }

    public void addProduct(Product product) {
        productList.add(product);
    }

    public void removeProduct(Product product) {
        productList.remove(product);
    }

    public List<Product> getProductList() {
        return productList;
    }

    public double getTotalPrice() {
        double totalPrice = 0;
        for (Product product : productList) {
            totalPrice += product.getPrice() * product.getQuantity();
        }
        return totalPrice;
    }
}

3. 创建一个商品列表页面

public class ProductListActivity extends AppCompatActivity {
    private List<Product> productList;
    private RecyclerView recyclerView;
    private ProductAdapter productAdapter;
    private ShoppingCart shoppingCart;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_product_list);

        // 初始化商品列表
        productList = new ArrayList<>();
        productList.add(new Product("商品1", 100, 0, R.drawable.product1));
        productList.add(new Product("商品2", 200, 0, R.drawable.product2));
        productList.add(new Product("商品3", 300, 0, R.drawable.product3));

        // 初始化购物车
        shoppingCart = new ShoppingCart();

        // 初始化RecyclerView
        recyclerView = findViewById(R.id.recycler_view);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        productAdapter = new ProductAdapter(productList, new ProductAdapter.OnItemClickListener() {
            @Override
            public void onItemClick(Product product) {
                // 添加商品到购物车
                shoppingCart.addProduct(product);
                Toast.makeText(ProductListActivity.this, "已添加到购物车", Toast.LENGTH_SHORT).show();
            }
        });
        recyclerView.setAdapter(productAdapter);
    }

    private class ProductHolder extends RecyclerView.ViewHolder {
        private ImageView imageView;
        private TextView nameTextView;
        private TextView priceTextView;

        public ProductHolder(LayoutInflater inflater, ViewGroup parent) {
            super(inflater.inflate(R.layout.list_item_product, parent, false));
            imageView = itemView.findViewById(R.id.product_image);
            nameTextView = itemView.findViewById(R.id.product_name);
            priceTextView = itemView.findViewById(R.id.product_price);
        }

        public void bind(Product product) {
            imageView.setImageResource(product.getImage());
            nameTextView.setText(product.getName());
            priceTextView.setText(String.format(Locale.getDefault(), "¥%.2f", product.getPrice()));
        }
    }

    private class ProductAdapter extends RecyclerView.Adapter<ProductHolder> {
        private List<Product> productList;
        private OnItemClickListener listener;

        public ProductAdapter(List<Product> productList, OnItemClickListener listener) {
            this.productList = productList;
            this.listener = listener;
        }

        public interface OnItemClickListener {
            void onItemClick(Product product);
        }

        @NonNull
        @Override
        public ProductHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
            LayoutInflater inflater = LayoutInflater.from(ProductListActivity.this);
            return new ProductHolder(inflater, parent);
        }

        @Override
        public void onBindViewHolder(@NonNull ProductHolder holder, int position) {
            Product product = productList.get(position);
            holder.bind(product);
            holder.itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    listener.onItemClick(product);
                }
            });
        }

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

4. 创建一个购物车页面

public class ShoppingCartActivity extends AppCompatActivity {
    private RecyclerView recyclerView;
    private ProductAdapter productAdapter;
    private ShoppingCart shoppingCart;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_shopping_cart);

        // 初始化购物车
        shoppingCart = new ShoppingCart();

        // 初始化RecyclerView
        recyclerView = findViewById(R.id.recycler_view);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        productAdapter = new ProductAdapter(shoppingCart.getProductList(), new ProductAdapter.OnItemClickListener() {
            @Override
            public void onItemClick(Product product) {
                // 从购物车中删除商品
                shoppingCart.removeProduct(product);
                productAdapter.notifyDataSetChanged();
            }
        });
        recyclerView.setAdapter(productAdapter);

        // 设置“结算”按钮的点击事件
        Button checkoutButton = findViewById(R.id.checkout_button);
        checkoutButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(ShoppingCartActivity.this, "总价：" + shoppingCart.getTotalPrice(), Toast.LENGTH_SHORT).show();
            }
        });
    }

    private class ProductHolder extends RecyclerView.ViewHolder {
        private ImageView imageView;
        private TextView nameTextView;
        private TextView priceTextView;
        private TextView quantityTextView;

        public ProductHolder(LayoutInflater inflater, ViewGroup parent) {
            super(inflater.inflate(R.layout.list_item_shopping_cart, parent, false));
            imageView = itemView.findViewById(R.id.product_image);
            nameTextView = itemView.findViewById(R.id.product_name);
            priceTextView = itemView.findViewById(R.id.product_price);
            quantityTextView = itemView.findViewById(R.id.product_quantity);
        }

        public void bind(Product product) {
            imageView.setImageResource(product.getImage());
            nameTextView.setText(product.getName());
            priceTextView.setText(String.format(Locale.getDefault(), "¥%.2f", product.getPrice()));
            quantityTextView.setText(String.format(Locale.getDefault(), "x%d", product.getQuantity()));
        }
    }

    private class ProductAdapter extends RecyclerView.Adapter<ProductHolder> {
        private List<Product> productList;
        private OnItemClickListener listener;

        public ProductAdapter(List<Product> productList, OnItemClickListener listener) {
            this.productList = productList;
            this.listener = listener;
        }

        public interface OnItemClickListener {
            void onItemClick(Product product);
        }

        @NonNull
        @Override
        public ProductHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
            LayoutInflater inflater = LayoutInflater.from(ShoppingCartActivity.this);
            return new ProductHolder(inflater, parent);
        }

        @Override
        public void onBindViewHolder(@NonNull ProductHolder holder, int position) {
            Product product = productList.get(position);
            holder.bind(product);
            holder.itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    listener.onItemClick(product);
                }
            });
        }

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

以上代码是一个简单的购物车实现，包括商品列表页面和购物车页面。在商品列表页面点击商品，会将商品添加到购物车中，可以在购物车页面进行删除和结算操作。