Android实现ListView分页自动加载数据的方法

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package com.andyidea.bean; 
public class News { 
   
  private String title;  //标题 
  private String content; //内容 
   
  public String getTitle() { 
    return title; 
  } 
  public void setTitle(String title) { 
    this.title = title; 
  } 
  public String getContent() { 
    return content; 
  } 
  public void setContent(String content) { 
    this.cOntent= content; 
  } 
 
} 

package com.andyidea.listview; 
 
import java.util.ArrayList; 
import java.util.List; 
 
import com.andyidea.bean.News; 
 
import android.app.Activity; 
import android.os.Bundle; 
import android.os.Handler; 
import android.util.Log; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.AbsListView; 
import android.widget.AbsListView.OnScrollListener; 
import android.widget.BaseAdapter; 
import android.widget.Button; 
import android.widget.ListView; 
import android.widget.TextView; 
import android.widget.Toast; 
 
public class PaginationListViewActivity extends Activity implements OnScrollListener { 
   
  private ListView listView;  
  private int visibleLastIndex = 0;  //最后的可视项索引  
  private int visibleItemCount;    // 当前窗口可见项总数  
  private int datasize = 38;     //模拟数据集的条数 
  private PaginationAdapter adapter;  
  private View loadMoreView;  
  private Button loadMoreButton;  
  private Handler handler = new Handler();  
   
  /** Called when the activity is first created. */ 
  @Override 
  public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
     
    loadMoreView = getLayoutInflater().inflate(R.layout.loadmore, null); 
    loadMoreButton = (Button)loadMoreView.findViewById(R.id.loadMoreButton); 
    loadMoreButton.setOnClickListener(new View.OnClickListener() { 
       
      @Override 
      public void onClick(View v) { 
        loadMoreButton.setText("正在加载中...");  //设置按钮文字 
        handler.postDelayed(new Runnable() { 
           
          @Override 
          public void run() { 
            loadMoreData(); 
            adapter.notifyDataSetChanged(); 
            loadMoreButton.setText("查看更多..."); //恢复按钮文字 
          } 
        },2000); 
         
      } 
    }); 
     
    listView = (ListView)findViewById(R.id.lvNews); 
    listView.addFooterView(loadMoreView);  //设置列表底部视图 
    initializeAdapter(); 
    listView.setAdapter(adapter); 
    listView.setOnScrollListener(this); 
  } 
   
  @Override 
  public void onScrollStateChanged(AbsListView view, int scrollState) { 
    int itemsLastIndex = adapter.getCount()-1; //数据集最后一项的索引  
    int lastIndex = itemsLastIndex + 1; 
    if (scrollState == OnScrollListener.SCROLL_STATE_IDLE 
        && visibleLastIndex == lastIndex) { 
      // 如果是自动加载,可以在这里放置异步加载数据的代码 
    } 
  } 
 
 
  @Override 
  public void onScroll(AbsListView view, int firstVisibleItem, 
      int visibleItemCount, int totalItemCount) { 
    this.visibleItemCount = visibleItemCount; 
    visibleLastIndex = firstVisibleItem + visibleItemCount - 1; 
     
    Log.e("========================= ","========================"); 
    Log.e("firstVisibleItem = ",firstVisibleItem+""); 
    Log.e("visibleItemCount = ",visibleItemCount+""); 
    Log.e("totalItemCount = ",totalItemCount+""); 
    Log.e("========================= ","========================"); 
     
    //如果所有的记录选项等于数据集的条数，则移除列表底部视图 
    if(totalItemCount == datasize+1){ 
      listView.removeFooterView(loadMoreView); 
      Toast.makeText(this, "数据全部加载完!", Toast.LENGTH_LONG).show(); 
    } 
  } 
   
  /** 
   * 初始化ListView的适配器 
   */ 
  private void initializeAdapter(){ 
    List news = new ArrayList(); 
    for(int i=1;i<=10;i++){ 
      News items = new News(); 
      items.setTitle("Title"+i); 
      items.setContent("This is News Content"+i); 
      news.add(items); 
    } 
    adapter = new PaginationAdapter(news); 
  } 
   
  /** 
   * 加载更多数据 
   */ 
  private void loadMoreData(){ 
    int count = adapter.getCount(); 
     
    if(count+10 <= datasize){ 
      for(int i=count+1; i<=count+10; i++){ 
        News item = new News(); 
        item.setTitle("Title"+i); 
        item.setContent("This is News Content"+i); 
        adapter.addNewsItem(item); 
      } 
    }else{ 
      for(int i=count+1; i<=datasize; i++){ 
        News item = new News(); 
        item.setTitle("Title"+i); 
        item.setContent("This is News Content"+i); 
        adapter.addNewsItem(item); 
      } 
    } 
     
  } 
   
   
  class PaginationAdapter extends BaseAdapter{ 
     
    List newsItems; 
     
    public PaginationAdapter(List newsitems){ 
      this.newsItems = newsitems; 
    } 
 
    @Override 
    public int getCount() { 
      return newsItems.size(); 
    } 
 
    @Override 
    public Object getItem(int position) { 
      return newsItems.get(position); 
    } 
 
    @Override 
    public long getItemId(int position) { 
      return position; 
    } 
 
    @Override 
    public View getView(int position, View view, ViewGroup parent) { 
      if(view == null){ 
        view = getLayoutInflater().inflate(R.layout.list_item, null); 
      } 
       
      //新闻标题 
      TextView tvTitle = (TextView)view.findViewById(R.id.newstitle); 
      tvTitle.setText(newsItems.get(position).getTitle()); 
      //新闻内容 
      TextView tvCOntent= (TextView)view.findViewById(R.id.newscontent); 
      tvContent.setText(newsItems.get(position).getContent()); 
       
      return view; 
    } 
     
    /** 
     * 添加数据列表项 
     * @param newsitem 
     */ 
    public void addNewsItem(News newsitem){ 
      newsItems.add(newsitem); 
    } 
     
  } 
 
}