Android RSS reader, FATAL ERROR

Question

I want to create a simple RSS Reader, and here's my actual code:

    public class MainActivity extends ListActivity {

    List headlines;
    List links;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Initializing instance variables
        headlines = new ArrayList();
        links = new ArrayList();

        try {
            URL url = new URL(
                    "http://www.radiojudaicastrasbourg.fr/category/podcasts/linvite-de-la-redaction/feed/");

            XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
            factory.setNamespaceAware(false);
            XmlPullParser xpp = factory.newPullParser();

            // We will get the XML from an input stream
            xpp.setInput(getInputStream(url), "UTF_8");

            /*
             * We will parse the XML content looking for the "<title>" tag which
             * appears inside the "<item>" tag. However, we should take in
             * consideration that the rss feed name also is enclosed in a
             * "<title>" tag. As we know, every feed begins with these lines:
             * "<channel><title>Feed_Name</title>...." so we should skip the
             * "<title>" tag which is a child of "<channel>" tag, and take in
             * consideration only "<title>" tag which is a child of "<item>"
             * 
             * In order to achieve this, we will make use of a boolean variable.
             */
            boolean insideItem = false;

            // Returns the type of current event: START_TAG, END_TAG, etc..
            int eventType = xpp.getEventType();
            while (eventType != XmlPullParser.END_DOCUMENT) {
                if (eventType == XmlPullParser.START_TAG) {

                    if (xpp.getName().equalsIgnoreCase("item")) {
                        insideItem = true;
                    } else if (xpp.getName().equalsIgnoreCase("title")) {
                        if (insideItem)
                            headlines.add(xpp.nextText()); // extract the
                                                            // headline
                    } else if (xpp.getName().equalsIgnoreCase("enclosure")) {
                        if (insideItem)
                            links.add(xpp.getAttributeValue(null, "url")); // extract
                                                                            // the
                                                                            // link
                                                                            // of
                                                                            // article
                    }
                } else if (eventType == XmlPullParser.END_TAG
                        && xpp.getName().equalsIgnoreCase("item")) {
                    insideItem = false;
                }

                eventType = xpp.next(); // move to next element
            }

        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (XmlPullParserException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        // Binding data
        ArrayAdapter adapter = new ArrayAdapter(this,
                android.R.layout.simple_list_item_1, headlines);

        setListAdapter(adapter);

    }

    public InputStream getInputStream(URL url) {
        try {
            return url.openConnection().getInputStream();
        } catch (IOException e) {
            return null;
        }
    }

    @Override
    protected void onListItemClick(ListView l, View v, int position, long id) {
        Uri uri = Uri.parse((String) links.get(position));
        Intent intent = new Intent(Intent.ACTION_VIEW, uri);
        startActivity(intent);
    }
}

When I start the application, it just closes instantly, and I don't know why. Here's the logcat:

>09-12 17:09:06.065: E/AndroidRuntime(11394): FATAL EXCEPTION: main
09-12 17:09:06.065: E/AndroidRuntime(11394): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.parserxml/com.example.parserxml.MainActivity}: android.os.NetworkOnMainThreadException
09-12 17:09:06.065: E/AndroidRuntime(11394):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2339)
09-12 17:09:06.065: E/AndroidRuntime(11394):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2389)
09-12 17:09:06.065: E/AndroidRuntime(11394):    at android.app.ActivityThread.access$600(ActivityThread.java:153)
09-12 17:09:06.065: E/AndroidRuntime(11394):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1269)
09-12 17:09:06.065: E/AndroidRuntime(11394):    at android.os.Handler.dispatchMessage(Handler.java:99)
09-12 17:09:06.065: E/AndroidRuntime(11394):    at android.os.Looper.loop(Looper.java:137)
09-12 17:09:06.065: E/AndroidRuntime(11394):    at android.app.ActivityThread.main(ActivityThread.java:5287)
09-12 17:09:06.065: E/AndroidRuntime(11394):    at java.lang.reflect.Method.invokeNative(Native Method)
09-12 17:09:06.065: E/AndroidRuntime(11394):    at java.lang.reflect.Method.invoke(Method.java:525)
09-12 17:09:06.065: E/AndroidRuntime(11394):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:738)
09-12 17:09:06.065: E/AndroidRuntime(11394):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:554)
09-12 17:09:06.065: E/AndroidRuntime(11394):    at dalvik.system.NativeStart.main(Native Method)
09-12 17:09:06.065: E/AndroidRuntime(11394): Caused by: android.os.NetworkOnMainThreadException
09-12 17:09:06.065: E/AndroidRuntime(11394):    at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1133)
09-12 17:09:06.065: E/AndroidRuntime(11394):    at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
09-12 17:09:06.065: E/AndroidRuntime(11394):    at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
09-12 17:09:06.065: E/AndroidRuntime(11394):    at java.net.InetAddress.getAllByName(InetAddress.java:214)
09-12 17:09:06.065: E/AndroidRuntime(11394):    at libcore.net.http.HttpConnection.<init>(HttpConnection.java:70)
09-12 17:09:06.065: E/AndroidRuntime(11394):    at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50)
09-12 17:09:06.065: E/AndroidRuntime(11394):    at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:340)
09-12 17:09:06.065: E/AndroidRuntime(11394):    at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:87)
09-12 17:09:06.065: E/AndroidRuntime(11394):    at libcore.net.http.HttpConnection.connect(HttpConnection.java:128)
09-12 17:09:06.065: E/AndroidRuntime(11394):    at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:316)
09-12 17:09:06.065: E/AndroidRuntime(11394):    at libcore.net.http.HttpEngine.connect(HttpEngine.java:311)
09-12 17:09:06.065: E/AndroidRuntime(11394):    at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:290)
09-12 17:09:06.065: E/AndroidRuntime(11394):    at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:240)
09-12 17:09:06.065: E/AndroidRuntime(11394):    at libcore.net.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:282)
09-12 17:09:06.065: E/AndroidRuntime(11394):    at libcore.net.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:177)
09-12 17:09:06.065: E/AndroidRuntime(11394):    at com.example.parserxml.MainActivity.getInputStream(MainActivity.java:95)
09-12 17:09:06.065: E/AndroidRuntime(11394):    at com.example.parserxml.MainActivity.onCreate(MainActivity.java:44)
09-12 17:09:06.065: E/AndroidRuntime(11394):    at android.app.Activity.performCreate(Activity.java:5201)
09-12 17:09:06.065: E/AndroidRuntime(11394):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
09-12 17:09:06.065: E/AndroidRuntime(11394):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2293)
09-12 17:09:06.065: E/AndroidRuntime(11394):    ... 11 more

`Caused by: android.os.NetworkOnMainThreadException`, search a bit around, you will a lot. — zapl, Sep 12 '13 at 15:22
Possible duplication of [link](http://stackoverflow.com/questions/6343166/android-os-networkonmainthreadexception) This exception is thrown when an application attempts to perform a networking operation on its main thread. Run your code in AsyncTask:" — Howli, Sep 12 '13 at 15:26

Prmths · Accepted Answer · 2013-09-12T19:21:30.813

0

As per the Android Documentation

The exception that is thrown when an application attempts to perform a networking operation on its main thread.

This is only thrown for applications targeting the Honeycomb SDK or higher. Applications targeting earlier SDK versions are allowed to do networking on their main event loop threads, but it's heavily discouraged. See the document Designing for Responsiveness.

You'll need to perform your network operation in another thread, not the UI Thread.

edited Sep 12 '13 at 19:21

answered Sep 12 '13 at 15:25

Prmths

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Thank you for you answer, I used the AsyncTask, and now it works perfectly! – NoTBleeD Sep 16 '13 at 13:50

Android RSS reader, FATAL ERROR

1 Answers1