Android SimpleAdapter

1.MainActivity.java

public class MainActivity extends Activity {
    private ListView listView;
    private SimpleAdapter simp_adapter;
    private List<Map<String, Object>> dataList;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

     /* 1.context:上下文对象
        2.data:数据源(List<? extents Map<String,?>> data)一个Map所组成的List集合.
        每一个Map都对应ListView列表中的一行.
        每一个Map(键-值对)中的键必须包含所有在from中所指定的键
        3.resource:列表项的布局文件ID
        4.from:Map中的键名
        5.to:绑定数据视图中的ID,与FROM成对应关系
        */

        listView = (ListView)findViewById(R.id.listView);
        //1.新建适配器
        dataList = new ArrayList<Map<String,Object>>();
        //2.适配器加载数据源
        simp_adapter = new SimpleAdapter(this, getData(),R.layout.item,
                new String[] {"image","text"}, new int[]{R.id.image,R.id.text});
        //视图加载适配器
        listView.setAdapter(simp_adapter);
    }

    public List<Map<String, Object>> getData(){
        for(int i = 0;i<20;i++){
            Map<String, Object> map = new HashMap<String, Object>();
            map.put("image", R.drawable.ic_launcher);
            map.put("text", "Just a Demo."+i);
            dataList.add(map);

        }

        return dataList;
    }
}

<RelativeLayout 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" >

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

</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal" >

    <ImageView
        android:id="@+id/image"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="20dp"
        android:src="@drawable/ic_launcher" />

    <TextView
        android:id="@+id/text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Demo"
        android:textColor="#000000"
        android:textSize="20sp" />

</LinearLayout>