Parse XML with DOM - getNodeValue() always null

bstubbs · by **bstubbs** » Wed Oct 08, 2008 7:37 pm

The problem is pretty simple: getNodeValue() is awlays coming up null. I can get the correct names in a list with
getNodeName(), but the value is always null. In other uses, I have done getTextContent(), but that doesn't seem to be an option. Has anyone else run into this? Here is my code just show an example.

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Using java Syntax Highlighting

 
 public void getSearch(String strURL) {
 
                // Connect to WH API - SEARCH FUNCTION
 
        URL url;
 
        URLConnection urlConn = null;
 
        mainList = new ArrayList<Listy>();
 
        try {
 
        url = new URL(strURL);
 
        urlConn = url.openConnection();
 
        } catch (IOException ioe) {
 
                contentdiv.setText("Could not Connect: "+ioe.getMessage());
 
        }
 
        Document doc = null;
 
        try {
 
           DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
 
           DocumentBuilder db = dbf.newDocumentBuilder();
 
           doc = db.parse(urlConn.getInputStream());
 
           String sid="", spage="", sname="", syear="", sim=""; 
 
           Node thisNode, currentNode; NodeList nchild, nodeList;
 
           nodeList = doc.getElementsByTagName("item");
 
           int length = nodeList.getLength();
 
           for (int i = 0; i < length; i++)
 
             {
 
                   currentNode = nodeList.item(i);
 
                   nchild = currentNode.getChildNodes();
 
                   int clength = nchild.getLength();
 
               for (int j = 0; j < clength; j++)
 
                {
 
                   thisNode = nchild.item(j);
 
                   String value = thisNode.getNodeValue();  
 
                   if("id".equals(thisNode.getNodeName())){sid = value;}
 
                   if("page".equals(thisNode.getNodeName())){spage = value;}
 
                   if("name".equals(thisNode.getNodeName())){sname = value;}
 
                   if("year".equals(thisNode.getNodeName())){syear = value;}
 
                   if("im".equals(thisNode.getNodeName())){sim = value;}
 
                }   
 
               mainList.add(new Listy(sid,sname,spage,syear,sim));    
 
           }   
 
           mFavList.setAdapter(new ArrayAdapter<Listy>(this,android.R.layout.simple_list_item_1, mainList));                        
 
        } 
 
          catch (ParserConfigurationException pce){contentdiv.setText("Could not Parse XML: "+pce.getMessage());} 
 
                  catch (SAXException se) {contentdiv.setText("Could not Parse XML: "+se.getMessage());}
 
                  catch (IOException ioe) {contentdiv.setText("Invalid XML: "+ioe.getMessage());} 
 
      }
 
Parsed in 0.180 seconds,  using GeSHi 1.0.8.4

The XML is encoded in UTF-8, could that be causing the problem?

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Using xml Syntax Highlighting

 
 <?xml version='1.0' encoding='UTF-8'?>
 
    <searchy>
 
         <item>
 
              <id>1</id>
 
              <page>person</page>
 
              <name>Guy</name>
 
              <year>1980</year>
 
              <im>None</im>
 
         </item>
 
         <item>
 
              <id>2</id>
 
              <page>person</page>
 
              <name>Other Guy</name>
 
              <year>1985</year>
 
              <im>None</im>
 
         </item>
 
   </searchy>
 
Parsed in 0.014 seconds,  using GeSHi 1.0.8.4

If I change a line in the code to have value = thisNode.getNodeName();, it displays the Node Names correctly. But the Node value, is always null...

Any thoughts (other than just using SAX). Thanks in advance!

ExxKA · by **ExxKA** » Sat Nov 07, 2009 1:52 pm

Hey.

I have the exact same problem. I am scared to find that you haven't got an answer yet (in a year!!). Did you ever solve this issue yourself?

I have seen people on the official android group asking this question aswell. But it doesn't seem to be solved.
http://www.mail-archive.com/android-developers@googlegroups.com/msg19336.html

My code is like this,

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NodeList nodes = xmlDoc.getElementsByTagName(TRIPID);
                                Node tripId = nodes.item(0);
                                Node tripIdContent = tripId.getFirstChild();
                                if(tripIdContent.getNodeType() == Node.TEXT_NODE ){
                                        String value = tripId.getNodeValue();
                                        String value2 = tripId.toString();
                                        return Long.parseLong(value);           
                                }
 
Parsed in 0.139 seconds,  using GeSHi 1.0.8.4

So as you can see, I actually check wether it's a TEXT_NODE or not.. Just to be extra sure. In the debugger, I can see that the Node object tripIdContent has a string buffer which does contain the right String I am trying to fetch. But no luck.
value == null, and value2 == org.apache.harmoney...blablabla ElementID.

Has anyone solved this issue, or are you using some other parser which actually works? I am not afraid of external jar's for as long as they play well with Android.Google Groups Post Web Page Name

qlimax · by **qlimax** » Sat Nov 07, 2009 6:53 pm

Hi, that seem to work for me...

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  NodeList nodeList=d.getElementsByTagName("name");
 
               int len=nodeList.getLength();
 
               for(int i=0;i<len;i++){
 
                   Node node=nodeList.item(i).getFirstChild();
 
                   Element element=(Element)nodeList.item(i);
 
                   String name=element.getNodeName();
 
                   String value=node.getNodeValue();
 
                   Log.v("",name+":"+value);
 
                   }
Parsed in 0.152 seconds,  using GeSHi 1.0.8.4

hope it helps

Bye

ExxKA · by **ExxKA** » Sun Nov 08, 2009 4:55 pm

Thanks champ. I'll try it out

ExxKA · by **ExxKA** » Sun Nov 08, 2009 5:05 pm

It seems I had bugged myself out.

My problem was that I was trying to get the value of the wrong node(not the child, but the parent)

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Using java Syntax Highlighting

 
NodeList nodes = xmlDoc.getElementsByTagName(TRIPID);
 
                                Node tripId = nodes.item(0);
 
                                Node tripIdContent = tripId.getFirstChild();
 
                                if(tripIdContent.getNodeType() == Node.TEXT_NODE ){
 
                                        String value = tripId.getNodeValue(); //SHOULD BE tripIdContent.getNodeValue();
 
                                        String value2 = tripId.toString(); 
 
                                        return Long.parseLong(value);           
 
                                }
 
Parsed in 0.153 seconds,  using GeSHi 1.0.8.4

Thanks for the help.

cupid062985 · by **cupid062985** » Thu May 13, 2010 6:55 am

same here, i also experience this problem... any other solution? none of the solutions are working...

Parse XML with DOM - getNodeValue() always null

Parse XML with DOM - getNodeValue() always null

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