学步园

效果图：

代码实现如下：

1、main.xml

<?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/listview"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        />
</LinearLayout>

2、item.xml

<?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_info"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textSize="22sp"
        android:textColor="@android:color/black"
        />
</LinearLayout>

3、footer.xml

<?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" >
    
    <ProgressBar 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        />
    
    <TextView 
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="正在努力加载中......"
        android:layout_gravity="center_vertical"
        />

</LinearLayout>

4、DataService

package com.njupt.pageloaddata3;

import java.util.ArrayList;
import java.util.List;

public class DataService {

	public List<String> getData(int startPosition,int offset){
		List<String> data = new ArrayList<String>();
	    int i;
	    for(i = 0 ; i < 20 ; ++i){
	    	data.add("章泽天是我的女神...." + i);
	    }
	    
	    return data;
	}
}

5、MainActivity

package com.njupt.pageloaddata3;

import java.util.ArrayList;
import java.util.List;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.os.SystemClock;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class MainActivity extends Activity {

	private static final int SUCCESS_GET_DATA = 0;
	private ListView listview;
	private List<String> data;
	private DataService service;
	private ArrayAdapter adapter;
	
	private boolean finish = true;
	private View footer;
	
	private Handler handler = new Handler(){
		public void handleMessage(android.os.Message msg) {
			switch (msg.what) {
			case SUCCESS_GET_DATA:
				ArrayList<String> result =  (ArrayList<String>) msg.obj;
				data.addAll(result);
				adapter.notifyDataSetChanged();
				finish = true;
				if(listview.getFooterViewsCount() > 0){
					listview.removeFooterView(footer);
				}
				break;

			default:
				break;
			}
		};
	};
	
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		
		listview = (ListView) findViewById(R.id.listview);
		data = new ArrayList<String>();
		service = new DataService();
		adapter = new ArrayAdapter<String>(this, R.layout.item, R.id.tv_info, data);
		footer = View.inflate(this, R.layout.footer, null);
		
		listview.addFooterView(footer);
		listview.setAdapter(adapter);
		listview.removeFooterView(footer);
		listview.setOnScrollListener(new MyOnScrollListener());
	}

	private class MyOnScrollListener implements OnScrollListener{

		private int countPage = 5;
		private int pageSize =20;
		
		@Override
		public void onScrollStateChanged(AbsListView view, int scrollState) {
			
		}

		@Override
		public void onScroll(AbsListView view, int firstVisibleItem,
				int visibleItemCount, int totalItemCount) {
			final int totalCount = firstVisibleItem + visibleItemCount ;
			int currentPage = totalCount/pageSize;
			int nextPage = currentPage + 1;
			
			if(totalCount == totalItemCount && nextPage <= countPage && finish){
				finish = false;
				listview.addFooterView(footer);
				new Thread(){
					public void run() {
						SystemClock.sleep(10000);
						Message msg = new Message();
						msg.what = SUCCESS_GET_DATA;
						msg.obj = service.getData(totalCount + 1, pageSize);
						handler.sendMessage(msg);
					};
				}.start();
			}
		}
		
	}
	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}