main6.xml 代码
<?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="vertical" >
<ListView
android:id="@+id/listView6_1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center" >
</ListView>
</LinearLayout>

load.xml 代码
<?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:gravity="center"
android:orientation="horizontal" >
<ProgressBar
android:id="@+id/progressBar1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="正在加载。。。。。" />
</LinearLayout>

main6_item.xml 代码
<?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="vertical" >
<TextView
android:id="@+id/tv_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Large Text"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="@+id/tv_content"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="TextView" />
</LinearLayout>

MainActivity6.java 代码
package com.gxuwz.android_21;
import java.util.ArrayList;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;
@SuppressLint("HandlerLeak")
public class MainActivity6 extends Activity implements OnScrollListener{
int index=1;//数据计数器， 索引。
private ListView lv;
private ArrayList<News> news=new ArrayList<News>();
MyAdapter adapter;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main6);
lv=(ListView) findViewById(R.id.listView6_1);
lv.setOnScrollListener(this);
//设置底部视图
View foot=getLayoutInflater().inflate(R.layout.load, null);
lv.addFooterView(foot);
intiData();
adapter=new MyAdapter();
lv.setAdapter(adapter);
}
//初始化数据
void intiData(){
for (int i = 0; i < 10; i++) {
News n=new News();
n.title="title"+index;
n.content="content"+index;
index++;
news.add(n);
}
}
//自定义适配器
class MyAdapter extends BaseAdapter{
public int getCount() {
return news.size();
}
public Object getItem(int position) {
return news.get(position);
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder vh;
if (convertView==null) {
convertView=getLayoutInflater().inflate(R.layout.main6_item, null);
vh=new ViewHolder();
vh.tv_tilte=(TextView) convertView.findViewById(R.id.tv_title);
vh.tv_content=(TextView) convertView.findViewById(R.id.tv_content);
convertView.setTag(vh);
} else {
vh=(ViewHolder) convertView.getTag();
}
News n=news.get(position);
vh.tv_content.setText(n.content);
vh.tv_tilte.setText(n.title);
return convertView;
}
}
static class ViewHolder{
TextView tv_tilte;
TextView tv_content;
}
//visibleLastIndex 表示最后一条数据的标号
int visibleLastIndex=0;
public void onScrollStateChanged(AbsListView view, int scrollState) {
//判断
if (visibleLastIndex==adapter.getCount()&&scrollState==OnScrollListener.SCROLL_STATE_IDLE){
//加载新数据
new LoadDataThread().start();
}
}
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
visibleLastIndex=firstVisibleItem+visibleItemCount-1;
}
//线程之间通信的桥梁
private Handler handler=new Handler(){
@SuppressLint("HandlerLeak")
public void handleMessage(android.os.Message msg) {
switch (msg.what) {
case 1:
adapter.notifyDataSetChanged();//数据更新
break;
default:
break;
}
};
};
//模拟加载数据过程
class LoadDataThread extends Thread{
public void run() {
intiData();//获取数据
try {
Thread.sleep(2000);//休眠3秒 模拟从网络获取数据
} catch (InterruptedException e) {
e.printStackTrace();
}
//通过handler处理器通知主线程。说数据已加载完毕！
handler.sendEmptyMessage(1);
}
}
}

记得修改AndroidManifest.xml
把
<activity
android:name="com.gxuwz.android_21.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
改成
<activity
android:name="com.gxuwz.android_21.MainActivity6"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

项目名称为android_21
包名为 com.gxuwz.android_21