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我尝试实现以下代码时收到NetworkOnMainThreadException:

public class HandlingXMLStuff extends ListActivity{
static final String URL = "xml_file";

 static final String ITEM = "item"; //parent
    static final String Id = "id";
    static final String Name = "name";
    static final String Desc = "desc";
    static final String Link = "Link";

@Override
public void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.xmllist);

ArrayList<HashMap<String, String>> menuItems = new ArrayList<HashMap<String, String>>(); 

xmlparser parser = new xmlparser();
String xml = parser.getXmlFromUrl(URL);
Document doc = parser.getDomElement(xml);


NodeList nl = doc.getElementsByTagName(ITEM);


//START: loop through all item nodes …

在android的ArrayList中，例如我经常看到的simplelistadapter ArrayList<?>，在一些教程中，我已经查看了<?>，并被某些值替换。但是我仍然不太确定这代表什么变量或限定词。