安卓：自定义适配器 activity_main
item 小项
MainActivity
package com.example.demoadapter;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ListView;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
//控件
private ListView listViewProduct ;
//数据
List listProduct ;
//自定义适配器
ProductAdapter productAdapter ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//获取控件
getView() ;
//准备数据
listProduct = makeData();
//实例化适配器
productAdapter = new ProductAdapter(this , listProduct,R.layout.item );
//绑定适配器
listViewProduct.setAdapter(productAdapter);
}private List makeData() {
List productList = new ArrayList<>() ;
Product caomei = new Product(R.mipmap.caomei , "草莓","21.5",11 ) ;
productList.add(caomei) ;
Product dagao = new Product(R.mipmap.dagao , "打糕" ,"9.5",15 ) ;
productList.add(dagao) ;
Product xiaobei = new Product(R.mipmap.xiaobei , "肉松小贝" ,"25" ,61 ) ;
productList.add(xiaobei) ;
Product zhishi = new Product(R.mipmap.zhishi , "芝士饼干" , "19" , 12 ) ;
productList.add(zhishi) ;
return productList ;
}private void getView() {
listViewProduct = findViewById(R.id.lv_product) ;
}
}
···## Product
```java
package com.example.demoadapter;
public class Product {
private int picture;
//图片
private String name ;
//名字
private String price ;
//价钱
private int stocks ;
//库存量public Product(int picture, String name, String price, int stocks) {
this.picture = picture;
this.name = name;
this.price = price;
this.stocks = stocks;
}public int getPicture() {
return picture;
}public void setPicture(int picture) {
this.picture = picture;
}public String getName() {
return name;
}public void setName(String name) {
this.name = name;
}public String getPrice() {
return price;
}public void setPrice(String price) {
this.price = price;
}public int getStocks() {
return stocks;
}public void setStocks(int stocks) {
this.stocks = stocks;
}@Override
public String toString() {
return "Product{" +
"picture=" + picture +
", name='" + name + '\'' +
", price='" + price + '\'' +
", stocks=" + stocks +
'}';
}
}ProductAdapter
package com.example.demoadapter;
import android.content.Context;
import android.content.Intent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import java.util.List;
public class ProductAdapter extends BaseAdapter {
//上下文环境
private Context mcontext ;
//数据源
private List listProduct ;
//子控件
private int layout ;
//构造方法传入数据public ProductAdapter(Context mcontext, List listProduct, int layout) {
this.mcontext = mcontext;
this.listProduct = listProduct;
this.layout = layout;
}@Override
public int getCount() {
return listProduct.size();
}@Override
public Object getItem(int i) {
return listProduct.get(i);
}@Override
public long getItemId(int i) {
return i;
}@Override
public View getView(int i, View view, ViewGroup viewGroup) {
if(null == view) {
//获取item控件
LayoutInflater inflater = LayoutInflater.from(mcontext) ;
view = inflater.inflate(R.layout.item , null) ;
}
//获取子布局中控件
ImageView picture = view.findViewById(R.id.product_picture) ;
TextView name = view.findViewById(R.id.product_name) ;
TextView price = view.findViewById(R.id.product_price) ;
TextView stocks = view.findViewById(R.id.product_stocks) ;
//获取当前的元素
Product product = listProduct.get(i) ;
//绑定数据
picture.setImageResource(product.getPicture());
name.setText(product.getName());
price.setText("￥" + product.getPrice());
stocks.setText("库存量" + product.getStocks());
return view;
}
}实现效果图 【安卓开发|安卓（自定义适配器）】
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