BaseAdapter适配器

package com.hanqi.testapp2;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
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 TestActivity9 extends AppCompatActivity {
     ListView lv_3;
     List<MyClass> lm;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_test9);
        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"));
        MyBaseAdapter myBaseAdapter=new MyBaseAdapter();
        lv_3.setAdapter(myBaseAdapter);

    }
    //装载数据的类 实体类 POJO类,简单java对象
    //一般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;
        }
        public MyClass()//默认构造方法
        {

        }
        //直接初始化属性的构造方法
        public MyClass(int img,String name,String content)//默认构造方法
        {
            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
        @Override                              //convertView可以复用的视图
        public View getView(int position, View convertView, ViewGroup parent) {
            Log.e("TAG","适配器getView="+position);
            //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(TestActivity9.this, R.layout.simple_adapter1, 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;
        }
    }
}