在fragment中使用listView设计一个商品展示页面

1.首先，在fragment的布局文件中添加一个ListView控件。例如：

<ListView
    android:id="@+id/listview"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

2.创建一个自定义的Adapter类，用于将商品数据显示在ListView上。例如：

public class ProductAdapter extends BaseAdapter {
    private Context mContext;
    private List<Product> mProductList;

    public ProductAdapter(Context context, List<Product> productList) {
        mContext = context;
        mProductList = productList;
    }

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

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

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        if (convertView == null) {
            convertView = LayoutInflater.from(mContext).inflate(R.layout.item_product, parent, false);
            holder = new ViewHolder();
            holder.imageView = convertView.findViewById(R.id.imageview);
            holder.nameTextView = convertView.findViewById(R.id.name_textview);
            holder.priceTextView = convertView.findViewById(R.id.price_textview);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }
        Product product = mProductList.get(position);
        holder.imageView.setImageResource(product.getImageResId());
        holder.nameTextView.setText(product.getName());
        holder.priceTextView.setText(product.getPrice());
        return convertView;
    }

    private static class ViewHolder {
        ImageView imageView;
        TextView nameTextView;
        TextView priceTextView;
    }
}

3.在fragment的Java代码中，初始化ListView控件，并使用上一步创建的Adapter类将商品数据显示在ListView上。例如：

public class ProductFragment extends Fragment {
    private ListView mListView;
    private ProductAdapter mAdapter;
    private List<Product> mProductList;

    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_product, container, false);
        mListView = view.findViewById(R.id.listview);
        mProductList = getProductList(); // 获取商品数据
        mAdapter = new ProductAdapter(getActivity(), mProductList);
        mListView.setAdapter(mAdapter);
        return view;
    }

    private List<Product> getProductList() {
        List<Product> productList = new ArrayList<>();
        productList.add(new Product(R.drawable.product1, "商品1", "100元"));
        productList.add(new Product(R.drawable.product2, "商品2", "200元"));
        productList.add(new Product(R.drawable.product3, "商品3", "300元"));
        return productList;
    }
}

4.最后，创建一个商品类Product，用于存储商品数据。例如：

public class Product {
    private int mImageResId;
    private String mName;
    private String mPrice;

    public Product(int imageResId, String name, String price) {
        mImageResId = imageResId;
        mName = name;
        mPrice = price;
    }

    public int getImageResId() {
        return mImageResId;
    }

    public String getName() {
        return mName;
    }

    public String getPrice() {
        return mPrice;
    }
}

这样，就可以在fragment中使用ListView设计一个商品展示页面了。