How to Parse XML file Using Dom Parsing?

Question

My Problem is I am Using Dom Parsing to parse below xml file but this give me error of NullPointerException.

Any Help Would be Appreciated.

MainActivity.java

Answer 1

Try this:

public class DomParserSampleActivity extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        ScrollView mScrView1 = new ScrollView(this);

        /** Create a new layout to display the view */
        LinearLayout layout = new LinearLayout(this);
        layout.setOrientation(1);

        /** Create a new textview array to display the results */
        TextView id[];
        TextView published[];
        TextView content[];
        TextView title[];

        TextView mediacontent[];
        TextView mediathumbnail[];

        try {
            URL url = new URL(
                    "http://gdata.youtube.com/feeds/api/users/estudiosabiertostv/uploads");
            DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
            DocumentBuilder db = dbf.newDocumentBuilder();
            Document doc = db.parse(new InputSource(url.openStream()));
            doc.getDocumentElement().normalize();

            NodeList nodeList = doc.getElementsByTagName("entry");

            /** Assign textview array length by arraylist size */
            id = new TextView[nodeList.getLength()];
            published = new TextView[nodeList.getLength()];
            content = new TextView[nodeList.getLength()];
            title = new TextView[nodeList.getLength()];
            mediacontent = new TextView[nodeList.getLength()];
            mediathumbnail = new TextView[nodeList.getLength()];

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

                Node node = nodeList.item(i);

                id[i] = new TextView(this);
                published[i] = new TextView(this);
                content[i] = new TextView(this);
                title[i] = new TextView(this);

                Element fstElmnt = (Element) node;

                NodeList idList = fstElmnt.getElementsByTagName("id");
                Element idElement = (Element) idList.item(0);
                idList = idElement.getChildNodes();
                id[i].setText("Id is = "
                        + ((Node) idList.item(0)).getNodeValue());

                Log.v("TAG","id: "+idList.item(0).getNodeValue());

                NodeList publishedList = fstElmnt
                        .getElementsByTagName("published");
                Element publishedElement = (Element) publishedList.item(0);
                publishedList = publishedElement.getChildNodes();
                published[i].setText("published is = "
                        + ((Node) publishedList.item(0)).getNodeValue());

                Log.v("TAG","published: "+publishedList.item(0).getNodeValue());

                NodeList contentList = fstElmnt.getElementsByTagName("content");
                Element contentElement = (Element) contentList.item(0);
                contentList = contentElement.getChildNodes();
                content[i].setText("content is = "
                        + ((Node) contentList.item(0)).getNodeValue());

                Log.v("TAG","content: "+contentList.item(0).getNodeValue());

                NodeList titleList = fstElmnt.getElementsByTagName("title");
                Element titleElement = (Element) titleList.item(0);
                titleList = titleElement.getChildNodes();
                title[i].setText("title is = "
                        + ((Node) titleList.item(0)).getNodeValue());

                Log.v("TAG","titulo: "+titleList.item(0).getNodeValue());

                NodeList nodeList1 = fstElmnt
                        .getElementsByTagName("media:group");

                for (int j = 0; j < nodeList1.getLength(); j++) {
                    Node node1 = nodeList1.item(j);
                    mediacontent[j] = new TextView(this);
                    mediathumbnail[j] = new TextView(this);

                    Element secondElmnt = (Element) node1;

                    NodeList mediacontentList = secondElmnt
                            .getElementsByTagName("media:content");
                    Element mediacontentElement = (Element) mediacontentList
                            .item(0);
                    mediacontent[j].setText("mediacontent url is = "
                            + mediacontentElement.getAttribute("url"));

                    Log.v("TAG","MEDIACONTENT: "+mediacontentElement.getAttribute("url"));

                    NodeList mediathumbnailList = secondElmnt
                            .getElementsByTagName("media:thumbnail");
                    Element mediathumbnailElement = (Element) mediathumbnailList
                            .item(0);
                    mediathumbnail[j].setText("mediathumbnail url is = "
                            + mediathumbnailElement.getAttribute("url"));

                    Log.v("TAG","MEDIATHUMBNAIL: "+mediathumbnailElement.getAttribute("url"));

                    layout.addView(mediacontent[j]);
                    layout.addView(mediathumbnail[j]);
                }

                layout.addView(id[i]);
                layout.addView(published[i]);
                layout.addView(content[i]);
                layout.addView(title[i]);

            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        /** Set the layout view to display */

        mScrView1.addView(layout);
        setContentView(mScrView1);
    }
}

Do not forget to do so within a thread or failing that, use these lines After the onCreate()

    StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
.permitAll().build();
    StrictMode.setThreadPolicy(policy);