简单适配器加载列表

activity_main.xml

item.xml

MainActivity.java

package com.example.prace3;

import android.app.Activity;
import android.os.Bundle;
import android.widget.ListView;
import android.widget.SimpleAdapter;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class MainActivity extends Activity implements AdapterView.OnItemClickListener{
    private ListView lv;
    private SimpleAdapter sim_Adapter;
    private List> dataList;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //初始化控件
        lv = findViewById(R.id.lv);
        dataList = new ArrayList>();
        //适配器加载数据源
        sim_Adapter = new SimpleAdapter(this,getData(),R.layout.item,new String[]{"img","text"},new int[]{R.id.img,R.id.text});
        /*  参数解析
            SimpleAdapter(context,data,resource,from,to);
            context:上下文
            data:数据源(List> data)一个map组成的集合；
                    每一个Map都会去对应ListView列表的每一行；
                    每一个Map中的键必须包含在所有form中指定的键
            resource:列表项的布局文件ID
            from:Map的键名
            to:绑定视图的ID，与from成对应关系
         */
        //视图加载器
        lv.setAdapter(sim_Adapter);lv.setOnItemClickListener(this);
    }

    private List> getData(){
        for (int i=0;i<20;i++){
            Map map = new HashMap();
            map.put("img",R.mipmap.ic_launcher);
            map.put("text","列表项"+i);
            dataList.add(map);
        }
        return dataList;
    };

  @Override
    public void onItemClick(AdapterView parent, View view, int position, long id) {
        String text = lv.getItemAtPosition(position)+"";
        Toast.makeText(MainActivity.this,"position"+position+" text"+text,Toast.LENGTH_SHORT).show();
    }
}