listview刷新数据，滑到底部就会更新数据，解析本地数据，用for循环赋值

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" 
    android:background="#df2"
    >

   <ListView 
       android:id="@+id/lv"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       ></ListView>

</RelativeLayout>

package com.example.day6_listview_more;

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

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.ViewTreeObserver.OnScrollChangedListener;
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{

    private ListView lv;
    private ArrayAdapter<String> adapter=null;
    //保存数据
    private List<String> data=null;
    //判断是否加载更多
    private boolean isload=false;
    int count=1;
    
    protected void onCreate(Bundle savedInstanceState) {
        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.listitem,data);
        lv.setAdapter(adapter);
        lv.setOnScrollListener(this);
        
    }

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

    

    @Override
    public void onScroll(AbsListView view, int firstVisibleItem,
            int visibleItemCount, int totalItemCount) {
        // TODO Auto-generated method stub
        isload=((firstVisibleItem+visibleItemCount)==totalItemCount);
        
    }

    @Override
    public void onScrollStateChanged(AbsListView view, int scrollState) {
        // TODO Auto-generated method stub
        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) {
    // TODO Auto-generated method stub
    getMenuInflater().inflate(R.menu.activity_main, menu);
    return true;
}
}

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textSize="20sp"
    android:text="aaa">
    
    

</TextView>