使用notifyDataSetChanged()无法更新视图
先说明一下程序实现的内容，我要将从服务器上下载的xml解析后显示在ListView上，网络请求部分单独建立线程实现，然后通过Handler，Message以字符串的形式传递回主线程。在主线程的onCreate（）里listView1.setAdapter(sAdapter);待从新建的网络请求线程传递回数据后通过sAdapter.notifyDataSetChanged();更新ListVIew，但是虚拟机始终显示黑屏，没有更新视图，请大家帮忙解决（xmlParse()是解析xml的函数）

Java code

public class ReceiveXMLOnlineActivity extends Activity {    private ListView listView1;    private String xmlMainOnline;    private SimpleAdapter sAdapter;    private List<Map<String,String>> xmlList=new ArrayList<Map<String,String>>() ;    static final int SENDXML=1;    static final int ALERTMESSAGE=2;    static final int ERROR=3;            //消息处理    Handler handler=new Handler(){        @Override        public void handleMessage(Message msg) {            // TODO Auto-generated method stub            super.handleMessage(msg);            switch(msg.what){            case SENDXML:                Bundle bundleRe=new Bundle();                bundleRe=msg.getData();                xmlMainOnline=bundleRe.getString("xml");                xmlList=xmlParse();                               sAdapter.notifyDataSetChanged();                            //没有更新                break;            case ALERTMESSAGE:                AlertDialog.Builder alertDialog=new AlertDialog.Builder(ReceiveXMLOnlineActivity.this);                alertDialog.setMessage("请求失败！").show();                break;            case ERROR:                Bundle bundleRe1=new Bundle();                bundleRe1=msg.getData();                String errorMessage=bundleRe1.getString("error");                AlertDialog.Builder alertDialog1=new AlertDialog.Builder(ReceiveXMLOnlineActivity.this);                alertDialog1.setMessage(errorMessage).show();                break;            }                    }            };        /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);                //为从网络获取XML建立新线程        ReceiveXMLOnline newThread=new ReceiveXMLOnline();                setContentView(R.layout.main);        listView1=(ListView)findViewById(R.id.listView1);        sAdapter=new SimpleAdapter(ReceiveXMLOnlineActivity.this,xmlList,R.layout.simpleadapter,new String[]{"FG_NAME","FG_ID"},new int[]{R.id.textView4,R.id.textView5});        listView1.setAdapter(sAdapter);                       //监听ListView的单击事件        listView1.setOnItemClickListener(new OnItemClickListener(){            @Override            public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,                    long arg3) {                // TODO Auto-generated method stub                switch(arg2){                case 0:                    changeActivity(0);                    break;                case 1:                    changeActivity(1);                    break;                case 2:                    changeActivity(2);                    break;                }            }                    });    }

[解决办法]
the xmlList after downlown is not the one you used to create adapter...

they are two different reference to diferent List;

so do not use = to change the data ,

please use removeall and addall .... and the data reference does not change,rather than its elements,and the notifyDataSet will work.