Android——BaseAdapter相关

layout文件：

 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:paddingBottom="@dimen/activity_vertical_margin"
     android:paddingLeft="@dimen/activity_horizontal_margin"
     android:paddingRight="@dimen/activity_horizontal_margin"
     android:paddingTop="@dimen/activity_vertical_margin"
     tools:context="com.hanqi.testapp2.TestActivity8">

     <ListView
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:id="@+id/lv_3"></ListView>
 </LinearLayout>

java类：

 package com.hanqi.testapp2;

 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
 import android.util.Log;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.BaseAdapter;
 import android.widget.ImageView;
 import android.widget.ListView;
 import android.widget.TextView;

 import java.util.ArrayList;
 import java.util.List;

 public class TestActivity8 extends AppCompatActivity {

     ListView lv_3;
     List<MyClass> lm;
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_test8);

         lv_3 = (ListView)findViewById(R.id.lv_3);

         //数据集合
         lm = new ArrayList<>();
         MyClass myClass = new MyClass(R.drawable.f1,"美食1","美食1的介绍");
         lm.add(myClass);
         lm.add(new MyClass(R.drawable.f2,"美食2","美食2的介绍"));
         lm.add(new MyClass(R.drawable.f3,"美食3","美食3的介绍"));
         lm.add(new MyClass(R.drawable.f4,"美食4","美食4的介绍"));
         lm.add(new MyClass(R.drawable.f5,"美食5","美食5的介绍"));
         lm.add(new MyClass(R.drawable.f6,"美食6","美食6的介绍"));
         lm.add(new MyClass(R.drawable.f7,"美食7","美食7的介绍"));
         lm.add(new MyClass(R.drawable.f8,"美食8","美食8的介绍"));
         lm.add(new MyClass(R.drawable.f9,"美食9","美食9的介绍"));

         MyBaseAdapter myBaseAdapter = new MyBaseAdapter();
         {
             lv_3.setAdapter(myBaseAdapter);
         }
     }

     //装载数据的类 实体类 POJO类
     //只包含属性和属性的getter和setter方法
     class MyClass
     {
         //img
         private int img;
         //name
         private String name;
         //content
         private String content;

         public int getImg() {
             return img;
         }

         public void setImg(int img) {
             this.img = img;
         }

         public String getName() {
             return name;
         }

         public void setName(String name) {
             this.name = name;
         }

         public String getContent() {
             return content;
         }

         public void setContent(String content) {
             this.content = content;
         }
         //默认构造方法
         public MyClass()
         {

         }
         //直接初始化属性的构造方法
         public MyClass(int img,String name,String content)
         {
             this.img = img;
             this.name = name;
             this.content = content;
         }
     }

     //内部类继承抽象类BaseAdapter实现4个方法
     class MyBaseAdapter extends BaseAdapter
     {
         @Override
         public int getCount() {
             return lm.size();
         }

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

         @Override
         public long getItemId(int position) {
             return 0;
         }

         //返回适配完成的视图
         //convertView 可以复用的视图
         @Override
         public View getView(int position, View convertView, ViewGroup parent) {

             //适配一条数据和View
             //1.得到数据
             MyClass myClass = lm.get(position);

             if (convertView ==null)
             {
                 Log.e("TAG","适配器getView = "+position);
                 //2.得到 View
                 //加载layout文件
                 convertView = View.inflate(TestActivity8.this, R.layout.simple_adapter, null);
             }
             //3.把数据放到View里
             ImageView imageView = (ImageView)convertView.findViewById(R.id.iv_2);
             imageView.setImageResource(myClass.getImg());

             TextView textView = (TextView)convertView.findViewById(R.id.tv_7);
             textView.setText(myClass.getName());

             TextView textView1 = (TextView)convertView.findViewById(R.id.tv_8);
             textView1.setText(myClass.getContent());
             return convertView;
         }
     }
 }

效果图为：