ListView 兑现像Android Market那样 分页加载 滚动加载

package zy.lucifer.ListViewScroll;  
import android.app.Activity;  
import android.os.Bundle;  
import android.util.Log;  
import android.view.Gravity;  
import android.view.View;  
import android.view.ViewGroup;  
import android.widget.AbsListView;  
import android.widget.BaseAdapter;  
import android.widget.LinearLayout;  
import android.widget.ListView;  
import android.widget.ProgressBar;  
import android.widget.TextView;  
import android.widget.Toast;  
import android.widget.AbsListView.OnScrollListener;  
import android.widget.LinearLayout.LayoutParams;  
public class ListViewScroll extends Activity {  
    /** Called when the activity is first created. */  
    private LayoutParams mLayoutParams = new LinearLayout.LayoutParams(  
            LinearLayout.LayoutParams.WRAP_CONTENT,  
            LinearLayout.LayoutParams.WRAP_CONTENT);  
    /** 
     * 设置布局显示目标最大化属性 
     */  
    private LayoutParams FFlayoutParams = new LinearLayout.LayoutParams(  
            LinearLayout.LayoutParams.FILL_PARENT,  
            LinearLayout.LayoutParams.FILL_PARENT);  
    ListView listView ;  
    private int lastItem = 0;  
    LinearLayout loadingLayout;  
    private listViewAdapter adapter;  
    @Override  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.main);  
        listView = (ListView) findViewById(R.id.myList);  
          
        Log.i("test", "onCreate(Bundle savedInstanceState)>>>>>>>>>>>>>>>");  
        // 线性布局  
        LinearLayout layout = new LinearLayout(this);  
        // 设置布局 水平方向  
        layout.setOrientation(LinearLayout.HORIZONTAL);  
        // 进度条  
        ProgressBar progressBar = new ProgressBar(this);  
        // 进度条显示位置  
        progressBar.setPadding(0, 0, 15, 0);  
        // 把进度条加入到layout中  
        layout.addView(progressBar, mLayoutParams);  
        // 文本内容  
        TextView textView = new TextView(this);  
        textView.setText("加载中...");  
        textView.setGravity(Gravity.CENTER_VERTICAL);  
        // 把文本加入到layout中  
        layout.addView(textView, FFlayoutParams);  
        // 设置layout的重力方向，即对齐方式是  
        layout.setGravity(Gravity.CENTER);  
        // 设置ListView的页脚layout  
        loadingLayout = new LinearLayout(this);  
        loadingLayout.addView(layout, mLayoutParams);  
        loadingLayout.setGravity(Gravity.CENTER);  
        listView.addFooterView(loadingLayout);  
        adapter = new listViewAdapter();  
        listView.setAdapter(adapter);  
        listView.setOnScrollListener(new OnScrollListener() {  
   
            @Override  
            public void onScroll(AbsListView view, int firstVisibleItem,  
                    int visibleItemCount, int totalItemCount) {  
                // TODO Auto-generated method stub  
                Log.i("test" , "Scroll>>>first: " + firstVisibleItem + ", visible: " + visibleItemCount + ", total: " + totalItemCount);  
                lastItem = firstVisibleItem + visibleItemCount - 1;  
                Log.i("test" , "Scroll>>>lastItem:" + lastItem);  
                //显示50条ListItem，即0-49，因为onScroll是在“滑动”执行过之后才触发，所以用adapter.count<=41作条件  
                int scrolllength=101;  
                if (adapter.count<=scrolllength) {  
                    if (firstVisibleItem+visibleItemCount==totalItemCount) {  
                        adapter.count += 10;  
                        adapter.notifyDataSetChanged();  
                        listView.setSelection(lastItem);  
                        int currentPage=adapter.count/10;  
                        Toast.makeText(getApplicationContext(), "第"+currentPage+"页", Toast.LENGTH_LONG).show();  
                    }  
                }  
                else {  
                     listView.removeFooterView(loadingLayout);   
                }  
            }  
            @Override  
            public void onScrollStateChanged(AbsListView view, int scrollState) {  
                // TODO Auto-generated method stub  
            }  
        });  
    }  
    class listViewAdapter extends BaseAdapter {  
        int count = 10; /* starting amount */  
        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) {  
            Log.i("test", "getView>>>pos:" + pos);  
            TextView view;  
            if (v == null) {  
                view = new TextView(ListViewScroll.this);  
            } else {  
                view = (TextView) v;  
            }  
            view.setText("ListItem " + pos);  
            view.setTextSize(20f);  
            view.setGravity(Gravity.CENTER);  
            view.setHeight(60);  
            return view;  
              
        }  
    }  
}  

<?xml version="1.0" encoding="utf-8"?>  
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    android:orientation="vertical"  
    android:layout_width="fill_parent"  
    android:layout_height="fill_parent"  
    >  
<ListView android:cacheColorHint="#00000000" android:id="@+id/myList"  
android:layout_width="fill_parent" android:layout_height="fill_parent"  
        >  
    </ListView>  
</LinearLayout>