ListView 的使用

ListView控件使用起来比较特殊，不想其他Activity是继承Activivt的，ListView是继承了ListAtivity，并且使用适配器时，需要单独定义适配器中显示的样式。

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <LinearLayout
        android:id="@+id/listviewlayout"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical" >

        <ListView
            android:id="@id/android:list"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:drawSelectorOnTop="false"
            android:scrollbars="vertical" />
    </LinearLayout>

</LinearLayout>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="horizontal"
    android:paddingBottom="1dip"
    android:paddingLeft="10dip"
    android:paddingRight="10dip"
    android:paddingTop="1dip" >

    <TextView
        android:id="@+id/username"
        android:layout_width="100dip"
        android:layout_height="33dip"
        android:singleLine="true"
        android:textSize="10pt" />

    <TextView
        android:id="@+id/userip"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:gravity="right"
        android:textSize="10pt" />

</LinearLayout>

package com.example.helloworld;

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

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

public class TenLessonDemo2 extends ListActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.tentwo);
        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("username", "zhaogan1");
        map1.put("userip", "zhaogan11");

        map2.put("username", "zhaogan2");
        map2.put("userip", "zhaogan22");

        map3.put("username", "zhaogan3");
        map3.put("userip", "zhaogan33");

        list.add(map1);
        list.add(map2);
        list.add(map3);
        // android提供的最简单的适配器,适配器里面存放的键值应与上面的map中的键值一致
        // 适配器里面的格式需要重新定义
        SimpleAdapter listAdepter = new SimpleAdapter(this, list,
                R.layout.tenthree, new String[] { "username", "userip" },
                new int[] { R.id.username, R.id.userip });
        // 上面的int 数组指的是在列表上面显示的问题标题
        setListAdapter(listAdepter);
    }

    @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);
    }

}