android OnScrollListener 監聽的簡單應用

實現OnscrollListening 接口 ，ListView 進行調用

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(); // 取得類的名字
private ListView listView ; //ListView 列表
private View footView ; // 用於顯示ListView底部的View
private List listmsg ; // 數據
private MyAdapter adapter; // 適配器，用於ListView
private Boolean isload =false ;
private int eachnum =10 ; // 每次加載的數據
private int maxnum = 25 ; // 最多加載的數據
@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); // 獲得底部View
listView.addFooterView(footView); // 將底部的視圖加載進去
init(); // 初始化加載List 信息
adapter = new MyAdapter(listmsg); // 初始化適配器
listView.setAdapter(adapter); //對ListView進行適配
listView.setOnScrollListener(this); // 對listView的滾動進行監聽
}

class MyAdapter extends BaseAdapter{
// 適配器
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.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) {
// 滑動的時候加載數據
// 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) {
        // 一進來加載數據 
    // 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 ;

}

}

佈局文件有三個，一個是主頁面的，一個ListView 適配數據的頁面，一個是底部視圖的頁面