精确监听ListView滑动到底部

main.xml如下:

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >

    <ListView
        android:id="@+id/listView"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_centerInParent="true"
     />

</RelativeLayout>

listviewitem.mxl如下:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <TextView
        android:id="@+id/textView"
        android:layout_width="fill_parent"
        android:gravity="center"
        android:layout_height="80dip"
     />

</RelativeLayout>

MainActivity如下:

import java.util.ArrayList;
import java.util.HashMap;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.ListView;
import android.widget.SimpleAdapter;

public class MainActivity extends Activity {
	private ListView mListView;
	private SimpleAdapter mSimpleAdapter;
	private HashMap<String, Object> mHashMap;
	private ArrayList<HashMap<String, Object>> mArrayList;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		init();
	}
	private void init(){
		mListView=(ListView) findViewById(R.id.listView);
		mArrayList=new ArrayList<HashMap<String,Object>>();
		addDataForListView();
		mSimpleAdapter=new SimpleAdapter
	   (MainActivity.this, mArrayList, R.layout.listviewitem, new String []{"id"},new int []{R.id.textView});
		mListView.setAdapter(mSimpleAdapter);
		mListView.setOnScrollListener(new OnScrollListenerImple());

	}
	private void addDataForListView(){
		System.out.println("====>Add data to ListView");
		for (int i = 0; i < 10; i++) {
			mHashMap=new HashMap<String, Object>();
			mHashMap.put("id", ""+i);
			mArrayList.add(mHashMap);
		}
	}
	private class OnScrollListenerImple implements OnScrollListener{
		@Override
		public void onScroll(AbsListView listView, int firstVisibleItem,int visibleItemCount, int totalItemCount) {
			int lastItem = firstVisibleItem + visibleItemCount;
            if(lastItem == totalItemCount) {
            	System.out.println("Scroll to the listview last item");
            	View lastItemView=(View) listView.getChildAt(listView.getChildCount()-1);
            	if ((listView.getBottom())==lastItemView.getBottom()) {
					System.out.println("========Scroll to the listview bottom =============");
					addDataForListView();
					mSimpleAdapter.notifyDataSetChanged();
				}
            }
		}

		@Override
		public void onScrollStateChanged(AbsListView listview, int scrollState) {

		}

	}

}