android xml parsing of inner tags

Here the following is my xml content

<response>
    <session>online</session>       
    <sitting>true</sitting> 
    <balance>85694.6</balance>  
    <num>13</num>       
    <lastactivity>06:48:19 21/08/2014</lastactivity>        
    <seatlist>
        <seat event="sit" num="13" brief="qc"  userId="8970ca285d9c4e4d"  showbalance="false"  usertypecode="ROBT" ></seat>
        <seat event="sit" num="12" brief="xz"  userId="34c80c3c1dcf47f2"  showbalance="false"  usertypecode="ROBT" ></seat>
    </seatlist>                 
    <userid>8970ca285d9c4e4d</userid>
</response>

Here i am able to parse the terms such as session, sitting balance, user id

when i try to parse the seatlist i am getting empty values.

Following is my parse code

String res = "my xml content from server"
XmlParser parser = new XmlParser();
Document doc = parser.getDomElement(res); // getting DOM element
NodeList nl = doc.getElementsByTagName("response");

for (int i = 0; i < nl.getLength(); i++) 
{

            Element e = (Element) nl.item(i);
            userId = String.valueOf(parser.getValue(e, "userid"));
            out.setBalance(Double.valueOf(parser.getValue(e, "balance")));
            out.setUserid(parser.getValue(e, "userid"));
            out.setTableName(parser.getValue(e, "table_name"));
            out.setSitting(Boolean.valueOf(parser.getValue(e, "sitting")));
            seatList.add(parser.getValue(e, "seatlist"));
            Log.e(""," ===== "+seatList);
}

Here is my xmlparser.class

public class XmlParser {

    public XmlParser() {
        // TODO Auto-generated constructor stub
    }

    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;
    }

     public String getValue(Element item, String str) {     
            NodeList n = item.getElementsByTagName(str);        
            return this.getElementValue(n.item(0));
        }

     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 "";
     }
}

How to parse the content within the seatlist tag