Android listview怎么实现滚动分页

package com.test;

import android.app.ListActivity;

import android.os.Bundle;

import android.os.Handler;

import android.view.Gravity;

import android.view.View;

import android.view.ViewGroup;

import android.widget.AbsListView;

import android.widget.BaseAdapter;

import android.widget.ImageView;

import android.widget.LinearLayout;

import android.widget.ProgressBar;

import android.widget.TextView;

import android.widget.AbsListView.OnScrollListener;

import android.widget.LinearLayout.LayoutParams;

public class test extends ListActivity implements OnScrollListener {

Aleph0 adapter = new Aleph0();

int lastItem = 0;

int mProgressStatus = 0;

private Handler mHandler = new Handler();

ProgressBar progressBar;

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

LinearLayout searchLayout = new LinearLayout(this);

searchLayout.setOrientation(LinearLayout.HORIZONTAL);

progressBar = new ProgressBar(this);

progressBar.setPadding(0, 0, 15, 0);

searchLayout.addView(progressBar, new LinearLayout.LayoutParams(

LinearLayout.LayoutParams.WRAP_CONTENT,

LinearLayout.LayoutParams.WRAP_CONTENT));

TextView textView = new TextView(this);

textView.setText("加载中...");

textView.setGravity(Gravity.CENTER_VERTICAL);

searchLayout.addView(textView, new LinearLayout.LayoutParams(

LinearLayout.LayoutParams.FILL_PARENT,

LinearLayout.LayoutParams.FILL_PARENT));

searchLayout.setGravity(Gravity.CENTER);

LinearLayout loadingLayout = new LinearLayout(this);

loadingLayout.addView(searchLayout, new LinearLayout.LayoutParams(

LinearLayout.LayoutParams.WRAP_CONTENT,

LinearLayout.LayoutParams.WRAP_CONTENT));

loadingLayout.setGravity(Gravity.CENTER);

getListView().addFooterView(loadingLayout);

// Start lengthy operation in a background thread

// new Thread(new Runnable() {

// public void run() {

// while (mProgressStatus < 100) {

//

// // Update the progress bar

// mHandler.post(new Runnable() {

// public void run() {

// progressBar.setProgress(mProgressStatus);

// }

// });

// }

// }

// }).start();

registerForContextMenu(getListView());

setListAdapter(adapter);

getListView().setOnScrollListener(this);

}

public void onScroll(AbsListView v, int firstVisibleItem,

int visibleItemCount, int totalItemCount) {

//lastItem = firstVisibleItem + visibleItemCount - 1;

//System.out.println("lastItem:" + lastItem);

}

public void onScrollStateChanged(AbsListView v, int state) {

// if (lastItem == adapter.count

// && state == OnScrollListener.SCROLL_STATE_IDLE) {

// adapter.count += 10;

// adapter.notifyDataSetChanged();

// }

if (state == OnScrollListener.SCROLL_STATE_IDLE) {

adapter.count += 10;

adapter.notifyDataSetChanged();

}

}

class Aleph0 extends BaseAdapter {

int count = 10;

public int getCount() {

return count;

}

public Object getItem(int pos) {

return pos;

}

public long getItemId(int pos) {

return pos;

}

public View getView(int pos, View v, ViewGroup p) {

TextView view = new TextView(test.this);

view.setText("entry " + pos);

view.setHeight(90);

return view;

}

}

}