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Editorial Team
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Asked: 2026-05-24T03:21:02+00:00

I have code written for Android 2.2 that is supposed to parse xml from

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I have code written for Android 2.2 that is supposed to parse xml from a webpage to a String. It works fine on an Android 2.2 emulator, but it gives me a NullPointerException on my Android 3.1 tablet. Here is the code:

Log.d("refreshMeta", "refreshing meta.");
            url = new URL("http://www.chineseoutreach.ca/media/Cstreaming.xml");
            URLConnection connection;
            connection = url.openConnection();

            HttpURLConnection httpConnection = (HttpURLConnection)connection;
            int responseCode = httpConnection.getResponseCode();

            if (responseCode == HttpURLConnection.HTTP_OK) {
                InputStream in = httpConnection.getInputStream();
                Log.d("Connection","connected");
                DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
                DocumentBuilder db = dbf.newDocumentBuilder();

                Document dom = db.parse(in);
                Element docEle = dom.getDocumentElement();
                NodeList nl = docEle.getElementsByTagName("nowplaying");
                Element entry = (Element)nl.item(0);

                try {
                    Element eartist = (Element)entry.getElementsByTagName("artist").item(0);
                sartist = eartist.getFirstChild().getNodeValue();
                Log.d("Artist",sartist);
                }
                catch(NullPointerException e) {
                    sartist = "";
                    Log.d("Connection",e.toString());
                }

Log on Android 3:

refreshmeta: refreshing meta.

Connection: Connected

Connection: java.lang.NullPointerException

EDIT
This is the line that causes it.
Element eartist = (Element)entry.getElementsByTagName(“artist”).item(0);

Edit 2

07-28 13:10:01.483: ERROR/Null(6189): my message

07-28 13:10:01.483: ERROR/Null(6189): java.lang.NullPointerException

07-28 13:10:01.483: ERROR/Null(6189): at com.ciam.app.CiamInfoActivity.refreshMeta(CiamInfoActivity.java:280)

07-28 13:10:01.483: ERROR/Null(6189): at com.ciam.app.CiamInfoActivity.access$0(CiamInfoActivity.java:257)

07-28 13:10:01.483: ERROR/Null(6189): at com.ciam.app.CiamInfoActivity$2.run(CiamInfoActivity.java:123)
07-28 13:10:01.483: ERROR/Null(6189): at java.lang.Thread.run(Thread.java:1020)

I suspect that there are some differences between the way xml is parsed on android 2 and android 3. Any ideas? Thanks in advance.

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1 Answer

  1. Editorial Team

    There is a small mistake in your code. I don’t really understand why it was working with android 2.1 emu, but it shouldn’t have. Your problem was that you were doing a dom.getDocumentElement(). That function will return the base tag of your xml file which is in this case “nowplaying”. And then you are doing a “docEle.getElementsByTagName(“nowplaying”);” over that.

    If you want to be sure to get “nowplaying”, you have to do a “dom.getElementsByTagName(“nowplaying”)”.

    Corrected version:

    Document dom = db.parse(in);
Element docEle = (Element)dom.getElementsByTagName("nowplaying").item(0);
Element eartist = (Element)docEle.getElementsByTagName("artist").item(0);
Element etitle = (Element)docEle.getElementsByTagName("title").item(0);
Log.d("Artist", eartist.getTextContent());
Log.d("Title", etitle.getTextContent());
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