16 ListView

package mars.listview;

import java.util.ArrayList;
import java.util.HashMap;

import android.app.ListActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ListView;
import android.widget.SimpleAdapter;

public class Activity01 extends ListActivity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        ArrayList<HashMap<String, String>> list = new ArrayList<HashMap<String, String>>();
        HashMap<String, String> map1 = new HashMap<String, String>();
        HashMap<String, String> map2 = new HashMap<String, String>();
        HashMap<String, String> map3 = new HashMap<String, String>();
        map1.put("user_name", "zhangsan");
        map1.put("user_ip", "192.168.0.1");
        map2.put("user_name", "zhangsan");
        map2.put("user_ip", "192.168.0.2");
        map3.put("user_name", "wangwu");
        map3.put("user_ip", "192.168.0.3");
        list.add(map1);
        list.add(map2);
        list.add(map3);
        MyAdapter listAdapter = new MyAdapter(this, list,
                R.layout.user1, new String[] { "user_name", "user_ip" },
                new int[] { R.id.user_name,R.id.user_ip});
        setListAdapter(listAdapter);
    }

    @Override
    protected void onListItemClick(ListView l, View v, int position, long id) {
        // TODO Auto-generated method stub
        super.onListItemClick(l, v, position, id);
        System.out.println("id----------------" + id);
        System.out.println("position----------" + position);
    }

}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent" android:layout_height="fill_parent"
    android:orientation="horizontal" android:paddingLeft="10dip"
    android:paddingRight="10dip" android:paddingTop="1dip"
    android:paddingBottom="1dip">
    <TextView android:id="@+id/user_name" android:layout_width="180dip"
        android:layout_height="30dip" android:textSize="5pt"
        android:singleLine="true" />
    <TextView android:id="@+id/user_ip" android:layout_width="fill_parent"
        android:layout_height="fill_parent" android:gravity="right"
        android:textSize="5pt" />
</LinearLayout>

根据列表的适配器类型，列表分为三种，ArrayAdapter，SimpleAdapter和SimpleCursorAdapter
其中以ArrayAdapter最为简单，只能展示一行字。SimpleAdapter有最好的扩充性，可以自定义出各种效果。 SimpleCursorAdapter可以认为是SimpleAdapter对数据库的简单结合，可以方面的把数据库的内容以列表的形式展示出来。