XML多標籤問題Android

Question

我正在使用xml，並遇到了一個我無法解決的問題。我在xml代碼中標記了相同的標籤，並且我需要將它們全部拉入，但目前我所擁有的代碼只是拉入第一個標籤。 XML代碼我試圖解析是：

<Pickup> 
    <AddressLine>Address Line 1</AddressLine> 
    <AddressLine>Address Line 2</AddressLine> 
    <AddressLine>Address Line 3</AddressLine> 
    <AddressLine>Address Line 4</AddressLine> 
    <AddressLine>Address Line 5</AddressLine> 
    <Postcode> 
     <PostcodeOut>PostCode One</PostcodeOut> 
     <PostcodeIn>PostCode Two</PostcodeIn> 
    </Postcode> 
    <AddressCoords> 
     <Latitude>00.000000</Latitude> 
     <Longitude>-0.000000</Longitude> 
    </AddressCoords> 

我與分析數據的代碼是：

XMLParser parser = new XMLParser(); 
    Document doc = parser.getDomElement(xml); // getting DOM 
    references = new ArrayList<String>(); 
    NodeList nl = doc.getElementsByTagName("Bookings"); 
    NodeList nlpickup = doc.getElementsByTagName("Pickup"); 
    NodeList nldestination = doc.getElementsByTagName("Destination"); 
    NodeList nlAddress = doc.getElementsByTagName("AddressLine"); 

    AddressData = new StringBuilder(); 
    addressData = new ArrayList<String>(); 


    // looping through all item nodes <item> 
    for (int i = 0; i < nl.getLength(); i++) {    

     Element e = (Element) nl.item(i); 
     resultCode = parser.getValue(e, "BookingNo"); 
     DateTime = parser.getValue(e, "PickupTime"); 

     Element etwo = (Element) nlpickup.item(i); 
     Element eaddress = (Element) nlAddress.item(i); 
     PAddressTwo = parser.getValue(eaddress, "AddressLine"); 

     AddressData.append(PAddressTwo + " ,"); 

     PPostIn = parser.getValue(etwo, "PostcodeOut"); 
     PPostOut = parser.getValue(etwo, "PostcodeIn"); 
     VType = parser.getValue(e, "VehicleType"); 
     Dist =parser.getValue(e, "Mileage"); 

     Element ethree = (Element) nldestination.item(i); 
     DAddressOne = parser.getValue(ethree, "AddressLine"); 
     DPostIn = parser.getValue(ethree, "PostcodeOut"); 
     DPostOut = parser.getValue(ethree, "PostcodeIn"); 

    } 

，我使用XML解析器是：

public class XMLParser { 

// constructor 
public XMLParser() { 

} 

/** 
* Getting XML from URL making HTTP request 
* @param url string 
* */ 
public String getXmlFromUrl(String url) { 
    String xml = null; 

    try { 
     // defaultHttpClient 
     DefaultHttpClient httpClient = new DefaultHttpClient(); 
     HttpPost httpPost = new HttpPost(url); 

     HttpResponse httpResponse = httpClient.execute(httpPost); 
     HttpEntity httpEntity = httpResponse.getEntity(); 



     xml = EntityUtils.toString(httpEntity); 
     InputStream is = new ByteArrayInputStream(xml.getBytes("UTF-8")); 
     BufferedReader reader = new BufferedReader(new InputStreamReader(
       is, "iso-8859-1"), 8); 
     StringBuilder sbtwo = new StringBuilder(); 
     String myfeed = null; 
     while ((myfeed = reader.readLine()) != null) { 
      final String newjsontwo = myfeed.replaceAll(
        "throw 'allowIllegalResourceCall is false.';", ""); 
      sbtwo.append(newjsontwo); 
     } 
     is.close(); 


    } catch (UnsupportedEncodingException e) { 
     e.printStackTrace(); 
    } catch (ClientProtocolException e) { 
     e.printStackTrace(); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 
    // return XML 
    return xml; 
} 

/** 
* Getting XML DOM element 
* @param XML string 
* */ 
public Document getDomElement(String xml){ 
    Document doc = null; 
    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); 
    try { 

     DocumentBuilder db = dbf.newDocumentBuilder(); 

     InputSource is = new InputSource(); 
      is.setCharacterStream(new StringReader(xml)); 
      doc = db.parse(is); 

     } catch (ParserConfigurationException e) { 
      Log.e("Error: ", e.getMessage()); 
      return null; 
     } catch (SAXException e) { 
      Log.e("Error: ", e.getMessage()); 
      return null; 
     } catch (IOException e) { 
      Log.e("Error: ", e.getMessage()); 
      return null; 
     } 

     return doc; 
} 

/** Getting node value 
    * @param elem element 
    */ 
public final String getElementValue(Node elem) { 
    Node child; 
    if(elem != null){ 
     if (elem.hasChildNodes()){ 
      for(child = elem.getFirstChild(); child != null; child = child.getNextSibling()){ 
       if(child.getNodeType() == Node.TEXT_NODE ){ 

        return child.getNodeValue(); 
       } 
      } 
     } 
    } 
    return ""; 
} 

/** 
    * Getting node value 
    * @param Element node 
    * @param key string 
    * */ 
public String getValue(Element item, String str) {  
     NodeList n = item.getElementsByTagName(str);   
     return this.getElementValue(n.item(0)); 
    } 

任何想法如何我的標籤和代碼在哪裏我會出錯？

Answer 1

你沒有做錯任何事。解析多個元素基本上就是您使用Bookings NodeList nl所做的。使用標記名稱Document類調用getElementsByTagName獲取NodeList，並使用NodeList的getLength（）方法和item（）方法遍歷NodeList內的節點。

NodeList nl = doc.getElementsByTagName("AdressLine"); 
for(int i = 0; i < nl.getLength(); i++) { 
    Node n = nl.item(0); 
    // do something with node... 
    Element e = (Element)n; 
    e.getElementsByTagName("PostCode"); 
} 

如果Node對象被轉換爲Element類，則Element類對象只允許訪問相應Node對象的子元素。在上面的代碼中，e.getElementsByTagName("PostCode");僅返回相應AdressLine元素的PostCode子元素。

對於您的情況，使用以下代碼行，例如在執行Document類的getElementsByTagName方法時，解析整個xml文檔的每個AdressLine。 Document類的doc對象對應於整個文檔。

NodeList nlAddress = doc.getElementsByTagName("AddressLine"); 

我希望這有助於！