Android中Listview实现分页加载效果OnScrollListener

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" 
    android:background="#000000"
    >

    <ListView 
    android:id="@+id/listveiw"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    
    ></ListView>

</RelativeLayout>

MainActivity.java

package com.bawei.day05_onscrolllistener;

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

import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity extends Activity implements OnScrollListener{

    private ListView listView;
    private List<String> list;
    //是否需要加载更多
    private boolean isLoad = false;
    
    int count = 1;
    private ArrayAdapter<String> adapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        listView = (ListView) findViewById(R.id.listveiw);
        list = new ArrayList<String>();
        //赋值
        getData();
        //适配
        adapter = new ArrayAdapter<String>(getApplicationContext(),android.R.layout.simple_expandable_list_item_1,list);
        listView.setAdapter(adapter);
        //监听
          listView.setOnScrollListener(this);
        
        
    }
   //赋值
    private void getData() {
    
        for (int i = 0; i <30; i++) {
            list.add(i+"");
        }
    }

    public void onScroll(AbsListView view, int firstVisibleItem,
            int visibleItemCount, int totalItemCount) {
        // TODO Auto-generated method stub
        Log.i("TAG", "firstVisibleItem="+firstVisibleItem);
        Log.i("TAG", "visibleItemCount="+visibleItemCount);
        Log.i("TAG", "totalItemCount="+totalItemCount);
        //isLoad为是否滚动到底部
        isLoad = ((firstVisibleItem+visibleItemCount)==totalItemCount);
    }
    /* (non-Javadoc)
     * 
     * SCROLL_STATE_FLING 手指做出抛的动作
     * SCROLL_STATE_IDLE 停止滚动
     * SCROLL_STATE_TOUCH_SCROLL 手指在屏幕上，屏幕滚动
     * @see android.widget.AbsListView.OnScrollListener#onScrollStateChanged(android.widget.AbsListView, int)
     */
    public void onScrollStateChanged(AbsListView view, int scrollState) {
        // TODO Auto-generated method stub
        Log.i("TAG", "onScrollStateChanged  isLoad="+isLoad+";是否是停止滚动："+(scrollState==OnScrollListener.SCROLL_STATE_IDLE));
        Log.i("TAG", "scrollState"+scrollState);
        //当ListView滚动到底部，并且ListView停止滚动
        //isLoad为是否滚动到底部
        //scrollState为当前状态有三种 ，不断变化，只有当他停止滚动才加载数据 
        if(isLoad&&scrollState==OnScrollListener.SCROLL_STATE_IDLE){
            Toast.makeText(getApplicationContext(), "开始加载数据", 1).show();
             //得到当前显示个数
            int id=adapter.getCount();
            //加载数据
            for (int i = id; i < id+10; i++) {
            list.add("加载第"+count+"次："+i)    ;
            }
            //加载了几次
            count++;
            //刷新
            adapter.notifyDataSetChanged();
        }
    }


}