WHAT IS ANDROID.OS.NETWORKONMAINTHREADEXCEPTION

Samuel Fernandes

Total Post:159

Points:1117
Posted by  Samuel Fernandes
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In the below code I got an error when running my Android project for RssReader.

And it shows an error:
android.os.NetworkOnMainThreadException

How can I fix this issue?

URL url = new URL(urlToRssFeed);
SAXParserFactory factory = SAXParserFactory.newInstance();
SAXParser parser = factory.newSAXParser();
XMLReader xmlreader = parser.getXMLReader();
RssHandler theRSSHandler = new RssHandler();
xmlreader.setContentHandler(theRSSHandler);
InputSource is = new InputSource(url.openStream());
xmlreader.parse(is);
return theRSSHandler.getFeed();
  1. Mayank Tripathi

    Post:397

    Points:3117
    Re: What is 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:

    class RetrieveFeedTask extends AsyncTask<String, Void, RSSFeed> {
        private Exception exception;
        protected RSSFeed doInBackground(String... urls) {
            try {
                URL url= new URL(urls[0]);
                SAXParserFactory factory =SAXParserFactory.newInstance();
                SAXParser parser=factory.newSAXParser();
                XMLReader xmlreader=parser.getXMLReader();
                RssHandler theRSSHandler=new RssHandler();
                xmlreader.setContentHandler(theRSSHandler);
                InputSource is=new InputSource(url.openStream());
                xmlreader.parse(is);
                return theRSSHandler.getFeed();
            } catch (Exception e) {
                this.exception = e;
                return null;
            }
        }
        protected void onPostExecute(RSSFeed feed) {
            // TODO: check this.exception 
            // TODO: do something with the feed
        }
    }

    How to execute the task: In MainActivity.java file you can add this line within your oncreate() method

    new RetrieveFeedTask().execute(urlToRssFeed);
    Don't forget to add this to AndroidManifest.xml file:

    <uses-permission android:name="android.permission.INTERNET"/>

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