在Android中解析XML流

Question

我不知道爲什麼，但是Log.i（TAG，「found：」+ found）;在我的XML中爲「found」元素返回null，表示我獲得了一個流。我已經調試過，看來我的XML的根元素被讀取，但是這個根元素的元素不是。 urlString也是正確的。文檔被解析，沒有任何錯誤和異常。但在這一行

NodeList nl = docEle.getElementsByTagName("found"); 
     found = nl.item(0).getNodeValue(); 

發現爲空。這是一個方法的全碼：

protected Void doInBackground(String... urls) { 

     String urlString = urls[0]; 
     URL documentUrl = null; 
     InputStream stream = null; 
     URLConnection conn = null; 
     DocumentBuilder builder = null; 
     Document document = null; 
     try { 
      DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); 
      builder = factory.newDocumentBuilder(); 

      documentUrl = new URL(urlString); 
      conn = documentUrl.openConnection(); 
      stream = conn.getInputStream(); 
      document = builder.parse(stream); 
     } 
     catch (IOException e) { 
      Error = e.getMessage(); 
      Log.i(TAG, "Exception!", e); 
     } 
     catch (SAXException e) { 
      Error = e.getMessage(); 
      Log.i(TAG, "Exception!", e); 
     } 
     catch (ParserConfigurationException e) { 
      Error = e.getMessage(); 
      Log.i(TAG, "Exception!", e); 
     } 
     finally 
     { 
      if (stream != null) 
      { 
       try { 
        stream.close(); 
       } catch (IOException e) { 
        Error = e.getMessage(); 
        Log.i(TAG, "Exception!", e); 
       } 
      } 
     } 

     /*NodeList nodes = document.getElementsByTagName("found"); 
     for (int i = 0; i < nodes.getLength(); i++) { 
      found = nodes.item(i).getNodeValue(); 
      //System.out.println(found); 
      Log.i(TAG, "found: "+found); 
     }*/ 

     //get the root element 
     Element docEle = document.getDocumentElement(); 
     NodeList nl = docEle.getElementsByTagName("found"); 
     found = nl.item(0).getNodeValue(); 
     Log.i(TAG, "found: "+found); 

     return null; 
    } 

這是我urlString與XML：http://basa.med-info.ru/xse/index.php?query=%E3%F0%E8%EF%EF&nres=20

發現必須等於20

Answer 1

用途：

found = nl.item(0).getFirstChild().getNodeValue();