Trouble with xml parsing through JAVA

First your example has syntax error (missing space before attribute)...

I like a JAXB very much... so I would recomend it to you. If your data has static format (not change format in time) it is the best way. Only "problem" could be with CDATA blocks, see this post for more information. Here is "fast" example... it is not nice code just a example!

    public class AdapterCDATA extends XmlAdapter {


      @Override
      public String marshal(String arg0) throws Exception {
        return "";
      }

      @Override
      public String unmarshal(String arg0) throws Exception {
        return arg0;
      }
    }

    public class TestData {

      @XmlRootElement(name = "prestashop")
      @XmlAccessorType(XmlAccessType.FIELD)
      static class Prestashop {

        @XmlElementWrapper(name = "products")
        @XmlElement(name = "product")
        List products;
      }

      @XmlAccessorType(XmlAccessType.FIELD)
      static class Product {
        @XmlJavaTypeAdapter(AdapterCDATA.class)
        @XmlElement(name = "id")
        String id;

        @XmlElement(name = "id_default_image")
        IdDefaultImage idDefaultImage;

        @XmlJavaTypeAdapter(AdapterCDATA.class)
        @XmlElement(name = "price")
        String price;

        @XmlElement(name = "name")
        Name name;
      }

      @XmlAccessorType(XmlAccessType.FIELD)
      static class IdDefaultImage {
        @XmlAttribute(name = "not_filterable")
        String notFilterable;

        @XmlAttribute(name = "href", namespace = "http://www.w3.org/1999/xlink")
        String href;

        @XmlJavaTypeAdapter(AdapterCDATA.class)
        @XmlValue
        String idDefaultImage;
      }

      @XmlAccessorType(XmlAccessType.FIELD)
      static class Name {
        @XmlElement(name = "language")
        Language language;
      }

      @XmlAccessorType(XmlAccessType.FIELD)
      static class Language {
        @XmlJavaTypeAdapter(AdapterCDATA.class)
        @XmlValue
        String language;

        @XmlAttribute(name = "href", namespace = "http://www.w3.org/1999/xlink")
        String href;

        @XmlAttribute(name = "id")
        String id;
      }

      public static void main(String[] args) throws JAXBException {
        JAXBContext jc = JAXBContext.newInstance(Prestashop.class);

        Unmarshaller unmarshaller = jc.createUnmarshaller();
        File xml = new File("src/test/resources/testData.xml");
        Prestashop prestashop = (Prestashop) unmarshaller.unmarshal(xml);

        Marshaller marshaller = jc.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        marshaller.marshal(prestashop, System.out);
      }
    }

EXAMPLE XML:

<a>
<b category='3' number='25' points='2'>
<c>
<d filename='' content='some content'/>
<d filename='0134.jpg'/>
</c>
<e>
<f description='desc' correct='1'/>
</e>
</a>

CODE FOR PARSING
Fields in parsing class to make later modification easier:

//data to parse
private static final String TAG_A = "a";        //root

private static final String TAG_B = "b";
private static final String ATT_CATEGORY = "category";
private static final String ATT_POINTS = "points";

private static final String TAG_D = "d";
private static final String ATT_FILE_NAME = "filename";
private static final String ATT_CONTENT = "content";

private static final String TAG_F = "f";
private static final String ATT_DESCRIPTION = "description";
private static final String ATT_CORRECT = "correct";

Method in parsing class:

    private void parseXml()
    {
        try
        {
            XmlPullParser parser = Xml.newPullParser();
            parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, false);
            parser.setInput(questionsXmlFile, null);
            parser.nextTag();
            parser.require(XmlPullParser.START_TAG, null, TAG_A);
            while (parser.next() != XmlPullParser.END_DOCUMENT)
            {
                if (parser.getEventType() == XmlPullParser.START_TAG)
                {
                    String name = parser.getName();
                    if (name.equalsIgnoreCase(TAG_B))
                    {
                        parser.getAttributeValue(null, ATT_CATEGORY));
                        parser.getAttributeValue(null, ATT_POINTS));
                    }
                    else if (name.equalsIgnoreCase(TAG_D))
                    {
                        parser.getAttributeValue(null, ATT_CONTENT));
                        parser.getAttributeValue(null, ATT_FILE_NAME));
                    }
                    else if (name.equalsIgnoreCase(TAG_ANSWER))
                    {
                    }
                }
            }
        }
        catch (XmlPullParserException e)
        {
            e.printStackTrace();
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
    }

What this method does? It traverse through xml from beginning to END_DOCUMENT and check if tags has been found are interesting one. If yes, check desired attributes and do nothing with it (add your own actions.
Remember, getAttributeValue() can return null. Be sure you dont operate on null.
Remember, parser.require(XmlPullParser.START_TAG, null, TAG_A) returns exception if variables passed to it are wrong comparing current situation of parser.

Your code looks all ok, only you have to remove <![CDATA[ .... ]]>

<id><![CDATA[ 526 ]]></id> change to <id>526</id>

or if you do not want to remove it, then do it following way,

Add the following method/function:

public String getCDataValue(Element e, String id) {
        NodeList title = e.getElementsByTagName(id);
        Element ex = (Element) title.item(0);
        Node child = ex.getFirstChild();
        if (child instanceof CharacterData) {
            CharacterData cd = (CharacterData) child;
            return cd.getData().trim();
        }
        return "";
}

and then use it this way:

NodeList nl = doc.getElementsByTagName("product");
       for (int i = 0; i < nl.getLength(); i++) {
        Element e = (Element) nl.item(i);
        Toast.makeText(getApplicationContext(), getCDataValue(e, "price"),
        Toast.LENGTH_SHORT).show();
}

if its is your code :

publishProgress(new ProductItems(
                      getCDataValue(e, "name"),
                      getCDataValue(e, "id"),
                      getCDataValue(e, "id_default_image"),
                      12.050000)
);