从单独的线程更新ListView数据

Question

我从网站解析一些xml内容。解析新闻项目时，我想在列表中显示他。当我解析每个项目时，我称之为onNewItemLoaded方法，需要更新列表视图。我知道适配器需要在UI线程中更新，所以我在runOnUiThread中启动它。但我仍然得到一个错误。我做错了什么？

    private ListView listView;
    private NewsAdapter adapter;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        listView = (ListView) findViewById(R.id.listView);
        final Parser parser = new Parser();
        adapter = new NewsAdapter(this,parser.getNews());
        listView.setAdapter(adapter);
        parser.setParserClient(new Parser.ParserClient() {
            @Override
            public void onNewItemLoaded(Item item) {
                // Update in UI Thread! What's wrong?!
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        adapter.updateList(parser.getNews());
                        adapter.notifyDataSetChanged();
                    }
                });
            }
        });
        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                parser.fetchXML("www.example.org"); // run separate thread
            }
        });
    }

来自LogCat：

    java.lang.IllegalStateException: The content of the adapter has changed but 
    ListView did not receive a notification. Make sure the content of your adapter 
    is not modified from a background thread, but only from the UI thread. 
    Make sure your adapter calls notifyDataSetChanged() when its content changes. 
    [in ListView(2130968576, class android.widget.ListView) with Adapter(class   com.example.censor_client.NewsAdapter)]

            at android.widget.ListView.layoutChildren(ListView.java:1555)
            at android.widget.AbsListView.onLayout(AbsListView.java:2087)
            at android.view.View.layout(View.java:14817)
            at android.view.ViewGroup.layout(ViewGroup.java:4631)
            at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1671)
            at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1525)
            at android.widget.LinearLayout.onLayout(LinearLayout.java:1434)
            at android.view.View.layout(View.java:14817)
            at android.view.ViewGroup.layout(ViewGroup.java:4631)
            at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1671)
            at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1525)
            at android.widget.LinearLayout.onLayout(LinearLayout.java:1434)
            at android.view.View.layout(View.java:14817)
            at android.view.ViewGroup.layout(ViewGroup.java:4631)
            at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453)
            at android.widget.FrameLayout.onLayout(FrameLayout.java:388)
            at android.view.View.layout(View.java:14817)