Android ListView滚动提示等待框

package cn.stay.activity;
import java.util.ArrayList;
import java.util.List;
import com.aoran.R;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.ProgressBar;
/**
* @author riddlezhang
* 滚动listview提示等待框
*/
public class ListView_sep extends Activity implements OnScrollListener {
private List<String> list = new ArrayList<String>();
private ListView listv01;
private MyAdapter adapter;
private int current_page = 2;
ProgressBar progressBar;
private LinearLayout bottom_linear;
private int lastItem;

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
listv01 = (ListView) findViewById(R.id.listv01);
bottom_linear=(LinearLayout) findViewById(R.id.bottom_linear);
for (int i = 0; i < 100; i++) {
list.add("i="+i);
}
adapter = new MyAdapter(ListView_sep.this, list);
listv01.setAdapter(adapter);
// listv01.setSelection(getSingerStrs().size()-1); 设置每次最后一行被选中
listv01.setOnScrollListener(this);
}
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
if (lastItem==adapter.count && scrollState == OnScrollListener.SCROLL_STATE_IDLE) {
if ((list.size() - current_page * 10) > 0) {
bottom_linear.setVisibility(View.VISIBLE);
if ((list.size() - current_page * 10) >= 10) {
adapter.count += 10;
} else {
adapter.count += (list.size() - current_page * 10);
}
current_page++;
adapter.notifyDataSetChanged();
// bottom_linear.setVisibility(View.GONE);
}
}
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
lastItem=firstVisibleItem+visibleItemCount;
}
}

package cn.stay.activity;
import java.util.List;
import com.aoran.R;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
public class MyAdapter extends BaseAdapter{
private Context mContext;
private List<String> list;
public int count=20;
private ViewHolder holder;

public MyAdapter(Context mContext,List<String> list) {
this.mContext=mContext;
this.list=list;
}
@Override
public int getCount() {
return count;
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return list.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
if(convertView==null || convertView.getTag()==null){
convertView=LayoutInflater.from(mContext).inflate(R.layout.adapter,null);
holder = new ViewHolder();
holder.adapter_tv=(TextView) convertView.findViewById(R.id.adapter_tv);
convertView.setTag(holder);
}else{
holder=(ViewHolder) convertView.getTag();
}
holder.adapter_tv.setText(list.get(position));
return convertView;
}
private class ViewHolder{
private TextView adapter_tv;
}
}

main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/project_main_bg"
>
<LinearLayout android:id="@+id/bottom_linear" android:layout_alignParentBottom="true" android:layout_width="fill_parent" android:layout_height="50dip" android:gravity="center" android:visibility="gone">
<ProgressBar android:layout_width="24dip" android:layout_height="24dip" android:layout_marginLeft="20dip" />
<TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="正在加载，请稍后。。。" android:textColor="#FFFFFF" android:textSize="20sp" android:gravity="center"/>
</LinearLayout>
<ListView android:id="@+id/listv01" android:background="@null" android:layout_above="@id/bottom_linear" android:layout_width="fill_parent" android:layout_height="wrap_content" android:listSelector="#00000000" android:cacheColorHint="#00000000"/>
</RelativeLayout>