android OnScrollListener 监听的简单应用

实现OnscrollListening 接口 ，ListView 进行调用

package com.example.test;

import java.util.ArrayList;

import java.util.List;

import android.os.Bundle;

import android.os.Handler;

import android.app.Activity;

import android.util.Log;

import android.view.LayoutInflater;

import android.view.Menu;

import android.view.View;

import android.view.ViewGroup;

import android.widget.AbsListView;

import android.widget.BaseAdapter;

import android.widget.ListView;

import android.widget.AbsListView.OnScrollListener;

import android.widget.TextView;

public class MainActivity extends Activity implements OnScrollListener {

private String tag = MainActivity.class.getName(); // 取得类的名字

private ListView listView ; //ListView 列表

private View footView ; // 用于显示ListView底部的View

private List listmsg ; // 数据

private MyAdapter adapter; // 适配器，用于ListView

private Boolean isload =false ;

private int eachnum =10 ; // 每次加载的数据

private int maxnum = 25 ; // 最多加载的数据

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

listmsg = new ArrayList();

listView =(ListView) findViewById(R.id.listView);

footView = getLayoutInflater().inflate(R.layout.buttons, null); // 获得底部View

listView.addFooterView(footView); // 将底部的视图加载进去

init(); // 初始化加载List 信息

adapter = new MyAdapter(listmsg); // 初始化适配器

listView.setAdapter(adapter); //对ListView进行适配

listView.setOnScrollListener(this); // 对listView的滚动进行监听

}

class MyAdapter extends BaseAdapter{

// 适配器

private List listMsg ;

public MyAdapter(List listMsg) {

// TODO Auto-generated constructor stub

this.listMsg = listMsg ;

}

@Override
public int getCount() {
// TODO Auto-generated method stub
return listmsg==null?0:listmsg.size();
}

@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return listmsg.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
LayoutInflater inflater = LayoutInflater.from(MainActivity.this);
convertView = inflater.inflate(R.layout.detatils, null);
TextView id = (TextView) convertView.findViewById(R.id.tv_id);
TextView news = (TextView) convertView.
4000
findViewById(R.id.tv_news);
id.setText(listmsg.get(position).getId());
news.setText(listmsg.get(position).getNews());
return convertView;
}

}

@Override

public void onScrollStateChanged(AbsListView view, int scrollState) {

// 滑动的时候加载数据

// TODO Auto-generated method stub

Log.i(tag, String.valueOf(scrollState)+”——-“+isload);

if(scrollState==1&&!isload){

more();

adapter.notifyDataSetChanged();

}

isload =false ;

}

@Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
// 一进来加载数据
// TODO Auto-generated method stub
if(firstVisibleItem+visibleItemCount==totalItemCount&&!isload){
//isload =true ;
new Handler().postDelayed(new Runnable() {

@Override
public void run() {
// TODO Auto-generated method stub
//more();
}
}, 2000);

}
Log.i(tag, firstVisibleItem+""+visibleItemCount+""+totalItemCount+"------------");
}

public void init(){

listmsg.add(new Msg("1","head"));
listmsg.add(new Msg("2","head"));
listmsg.add(new Msg("3","head"));
listmsg.add(new Msg("4","head"));
listmsg.add(new Msg("5","head"));
listmsg.add(new Msg("6","head"));
listmsg.add(new Msg("7","head"));
listmsg.add(new Msg("8","head"));
}
public void more(){
int i = adapter.getCount() ;
for(int x = 0;x<eachnum;x++){
if(i+x<maxnum){
Log.i(tag, String.valueOf(((i+x))));
listmsg.add(new Msg(String.valueOf(i+x),"head"));
//adapter.notifyDataSetChanged();
}else{
listView.removeFooterView(footView);
}
}
adapter.notifyDataSetChanged();
//isload =true ;

}

}

布局文件有三个，一个是主页面的，一个ListView 适配数据的页面，一个是底部视图的页面