notifyDataSetChanged() 动态更新ListView 经过 Handler AsyncTask两种方式

notifyDataSetChanged() 动态更新ListView 通过 Handler AsyncTask两种方式
http://www.pocketdigi.com/20100827/75.html

有时候我们需要修改已经生成的列表，添加或者修改数据，notifyDataSetChanged()可以在修改适配器绑定的数组后，不用重新刷新Activity，通知Activity更新ListView。今天的例子就是通过Handler AsyncTask两种方式来动态更新ListView.从今天起，每次学习的源代码都会打包上传，方便各位同学学习，注册帐号即可下载。
布局main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<ListView  android:id="@+id/lv"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
</LinearLayout>

ListView列表布局playlist.xml:

<?xml version="1.0" encoding="utf-8"?>
<TextView 
  android:id="@+id/text1"
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="30px"
  android:textSize="18sp"
></TextView>

程序代码：

package com.pocketdigi;
 
import java.util.ArrayList;
 
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.AdapterView.OnItemClickListener;
 
public class main extends Activity {
    /** Called when the activity is first created. */
	ListView lv;
	ArrayAdapter<String> Adapter;
	ArrayList<String> arr=new ArrayList<String>();
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        lv=(ListView)findViewById(R.id.lv);
    	arr.add("123");
    	arr.add("234");
    	arr.add("345");
    	Adapter = new ArrayAdapter<String>(this,R.layout.playlist, arr);
    	lv.setAdapter(Adapter);
    	lv.setOnItemClickListener(lvLis); 
    	editItem edit= new editItem();
    	edit.execute("0","第1项");//把第一项内容改为"第一项"
    	Handler handler=new Handler();
    	handler.postDelayed(add,3000);//延迟3秒执行
    }
    Runnable add=new Runnable(){
 
		@Override
		public void run() {
			// TODO Auto-generated method stub
			arr.add("增加一项");//增加一项
			Adapter.notifyDataSetChanged();	
		}   	
    };
    class editItem extends AsyncTask<String,Integer,String>{
		@Override
		protected String doInBackground(bbcode_editor.textarea.insertAfterSelection(response.responseText);
        Element.scrollTo(editor.bbcode_editor.textarea.element);}
    });
  }

  new WeiboShare({share_buttons: $('share_weibo'), img_scope: $('blog_content')});