listView滑動載入資料代碼

package com.example.listview;

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

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;
public class MainActivity extends Activity implements OnClickListener,
OnScrollListener {
private ListView listView = null;
private int lastIndex=0;//最後一條資料的角標
private int pageLastIndex=0;//一頁的最後一條資料的索引
private MyAdapter myAdapter=new MyAdapter(getData());
private  Handler handler=new Handler();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initview();
}
private void initview() {
listView = (ListView) this.findViewById(R.id.listview);
viewAction();
}
private void viewAction() {
// TODO Auto-generated method stub
listView.setAdapter(myAdapter);
listView.setOnScrollListener(this);//想要讓某一個事件響應的話，就必須給他設定相對應的事件
}

//擷取資料
private List getData() {
List<String> list=new ArrayList<String>();
for (int i = 0; i < 30;i++) {
list.add("你好：："+i);
}
return list;
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {

lastIndex=myAdapter.getCount()-1;//總資料的最後一條資料的索引，因為在頁面上顯示的資料的索引從0開始
pageLastIndex=firstVisibleItem+visibleItemCount-1;//頁面上顯示的最後一條資料的索引
//firstVisibleItem   頁面上顯示第一條資料的索引、
//visibleItemCount   頁面上顯示的多少條資料的個數
//totalItemCount     所有資料的總條數
Log.d("yujianbin", "onScroll方法執行 firstVisibleItem：："+firstVisibleItem);
Log.d("yujianbin", "onScroll方法執行 visibleItemCount：："+visibleItemCount);
Log.d("yujianbin", "onScroll方法執行 totalItemCount：："+totalItemCount);
}

@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
// TODO Auto-generated method stub

if(OnScrollListener.SCROLL_STATE_FLING==scrollState){
Log.d("yujianbin", "listview正在滾動");


//如果滑動停止了，並且到了最後一條資料時就讓載入資料
}else if(OnScrollListener.SCROLL_STATE_IDLE==scrollState&&lastIndex==pageLastIndex){
Log.d("yujianbin", "listview停止滾動");//一般在這個狀態載入資料
Log.d("yujianbin", "lastIndex:::"+lastIndex);
Log.d("yujianbin", "pageLastIndex:::"+pageLastIndex);
             Runnable run=new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
//1，載入資料
loadData();
Log.d("yujianbin", "listview載入資料");//一般在這個狀態載入資料
// handler.postDelayed(this, 2000);//在run方法中表示每隔兩秒執行一次
}
};
handler.postDelayed(run, 2000);
}else if(OnScrollListener.SCROLL_STATE_TOUCH_SCROLL==scrollState){
Log.d("yujianbin", "觸控螢幕幕開始滾動");

}
}
@Override
public void onClick(View v) {

}


//分頁顯示的資料
private void loadData(){
for(int i=20;i<40;i++){
myAdapter.addItem("item:"+i);
}
myAdapter.notifyDataSetChanged();
}

class MyAdapter extends BaseAdapter {

private List list = null;

public MyAdapter(List list) {
// TODO Auto-generated constructor stub
this.list = list;
}

@Override
public int getCount() {
// TODO Auto-generated method stub
return list.size();
}

@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return list.get(position);
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
ViewHolder viewHolder;
if (convertView == null) {
viewHolder = new ViewHolder();
LayoutInflater inflater = LayoutInflater
.from(MainActivity.this);
convertView = inflater.inflate(R.layout.item, null);
viewHolder.text1 = (TextView) convertView
.findViewById(R.id.text1);
viewHolder.text2 = (TextView) convertView
.findViewById(R.id.text2);
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
viewHolder.text1.setText(String.valueOf(position));
viewHolder.text2.setText((CharSequence) list.get(position));

return convertView;
}
public void addItem(String str){
list.add(str);
}
}
}
class ViewHolder {
public TextView text1 = null;
public TextView text2 = null;

}