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>
<?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>
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(){ @Overridepublic void run() {// TODO Auto-generated method stubarr.add("增加一项");//增加一项Adapter.notifyDataSetChanged();} }; class editItem extends AsyncTask<String,Integer,String>{@Overrideprotected 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')});