上拉加载页面

package com.example.listviewloaddatademo;

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

import com.lidroid.xutils.view.annotation.ViewInject;
import com.lidroid.xutils.view.annotation.event.OnClick;

import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
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;
import android.widget.Toast;

public class MainActivity extends Activity implements OnScrollListener{
    @ViewInject(R.id.lv)
    private ListView lv;
    private ArrayAdapter<String> adapter = null;
    
    private List<String> data = null;//保存数据
    //是否需要加载更多
    private boolean isLoad = false;
    
    int count = 1;
    
    @OnClick(R.id.lv)
    public void sa(View v){
        
    }
    
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        lv = (ListView)findViewById(R.id.lv);
        data = new ArrayList<String>();
        initData("");
        adapter = new ArrayAdapter<String>(getApplicationContext(),R.layout.list_pager_item,data);
        lv.setAdapter(adapter);
        lv.setOnScrollListener(this);
    }

    // "" 本地数据   web 网络数据
    private void initData(String param) {
        // TODO Auto-generated method stub
        for(int i=0;i<30;i++){
            data.add(param+" data"+i);
        }
    }

    //
    @Override
    public void onScroll(AbsListView view, int firstVisibleItem,int visibleItemCount, int totalItemCount) {
        // TODO Auto-generated method stub
        //Log.i("aaa", "onScroll");
        Log.i("TAG", "firstVisibleItem="+firstVisibleItem);
        Log.i("TAG", "visibleItemCount="+visibleItemCount);
        Log.i("TAG", "totalItemCount="+totalItemCount);
        isLoad = ((firstVisibleItem+visibleItemCount)==totalItemCount);
        
    }

    
    
    /* (non-Javadoc)
     * 
     * SCROLL_STATE_FLING 手指做出抛的动作
     * SCROLL_STATE_IDLE 停止滚动
     * SCROLL_STATE_TOUCH_SCROLL 手指在屏幕上，屏幕滚动
     * @see android.widget.AbsListView.OnScrollListener#onScrollStateChanged(android.widget.AbsListView, int)
     */
    @Override
    public void onScrollStateChanged(AbsListView view, int scrollState) {
        // TODO Auto-generated method stub
        //当ListView滚动到底部，并且ListView停止滚动
        Log.i("TAG", "onScrollStateChanged  isLoad="+isLoad+";是否是停止滚动："+(scrollState==OnScrollListener.SCROLL_STATE_IDLE));
        Log.i("TAG", "scrollState"+scrollState);
        if(isLoad&&scrollState==OnScrollListener.SCROLL_STATE_IDLE){
            Toast.makeText(getApplicationContext(), "开始加载数据", 1).show();
            initData("web"+count);
            count++;
            adapter.notifyDataSetChanged();
        }
        
        
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

}