Datei zugriff und XML parsen

public class fenster1 extends ListActivity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        // XML File einlesen_________________________________________________________________
        DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();            
        DocumentBuilder docBuilder = null;
        ArrayList<Object> MarkerListe = new ArrayList<Object>();
        
        try 
        {
            docBuilder = docBuilderFactory.newDocumentBuilder();
        } 
        catch (ParserConfigurationException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
        Document doc = null;
        try 
        {
            doc = docBuilder.parse (new File("datei.xml"));
            
            
            
        }
        
        catch (SAXException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
            MarkerListe.add("nich gefunden");
        } 
        
        catch (IOException e)
        {
            // TODO Auto-generated catch block
            
        }
      
         //XML File benutzen______________________________________________
        
        {
            
        try
        {
        NodeList listOfMarkers = doc.getElementsByTagName("marker");
        
            for (int i = 0; i < listOfMarkers.getLength(); i++) 
            {
                MarkerListe.add(listOfMarkers.item(i));
            }
        
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
       
        
        
        
        ListAdapter listenAdapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, MarkerListe);
    
        ListView MarkerListView = (ListView) findViewById(id.list);
        MarkerListView.setAdapter(listenAdapter);
    
    
    }