android适配器及监听点击和滚动在ListView中的使用

package com.example.demon08;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity implements OnItemClickListener,OnScrollListener{

private ListView listView;
private ArrayAdapter<String> arr_adapter;
private SimpleAdapter simp_adapter;
private List<Map<String,Object>>dataList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
listView=(ListView) findViewById(R.id.listView);
//新建一个适配器
//ArrayAdapter(上下文，当前listView加载的每一个列表项所对应的布局文件,数据源)
//适配器加载数据源
String[]arr_data={"战斗暴龙兽","机械暴龙兽","丧尸暴龙兽","暴龙兽","亚古兽","滚球兽"};
arr_adapter=new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,arr_data);
//SimpleAdapter
//上下文
//数据源List<? extends Map<String, ?>> data一个Map所组成List集合，
//每一个Map都会去对应ListView列表中的一行
//每一个Map（键-值对）中的键必须包含所有在from中指定的键
//resource:列表项的布局文件ID
//from:Map中的键名
//绑定数据视图中的ID，与from成对应关系
dataList=new ArrayList<Map<String,Object>>();
simp_adapter=new SimpleAdapter(this,getData(),R.layout.item,new String[]{"pic","text"},new int[]{R.id.pic,R.id.text});
//视图加载适配器
//listView.setAdapter(arr_adapter);
listView.setAdapter(simp_adapter);
listView.setOnItemClickListener(this);
listView.setOnScrollListener(this);
}

private List<Map<String,Object>> getData(){
for(int i=0;i<20;i++){
Map<String,Object> map=new HashMap<String,Object>();
map.put("pic",R.drawable.ic_launcher);
map.put("text","刀冲"+i);
dataList.add(map);
}

return dataList;
}

@Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
// TODO Auto-generated method stub

}

@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
// TODO Auto-generated method stub
switch(scrollState){
case SCROLL_STATE_FLING:
Log.i("Main","用户在手指离开屏幕之前，由于用力滑了一下，视图仍依靠惯性继续滑动");
Map<String,Object>map=new HashMap<String,Object>();
map.put("pic",R.drawable.ic_launcher);
map.put("text","增加项");
dataList.add(map);
simp_adapter.notifyDataSetChanged();
break;
case SCROLL_STATE_IDLE:
Log.i("Main","视图已经停止滑动");
break;
case SCROLL_STATE_TOUCH_SCROLL:
Log.i("Main","手指没有离开屏幕，视图正在滑动");
break;
}
}

@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// TODO Auto-generated method stub
String text=listView.getItemAtPosition(position)+"";
Toast.makeText(this,"position="+position+" text="+text,Toast.LENGTH_SHORT).show();
}

}