If you want to parse an RSS Feed using SimpleXML you can use this as an Start. I used this to parse RSS using RetroFit from Square

Channel.java

import org.simpleframework.xml.Attribute;
import org.simpleframework.xml.Element;
import org.simpleframework.xml.ElementList;
import org.simpleframework.xml.Namespace;
import org.simpleframework.xml.NamespaceList;
import org.simpleframework.xml.Root;
import org.simpleframework.xml.Text;

import java.util.List;

@NamespaceList({
        @Namespace(reference = "http://www.w3.org/2005/Atom", prefix = "atom")
})
@Root(strict = false)
public class Channel {
    // Tricky part in Simple XML because the link is named twice
    @ElementList(entry = "link", inline = true, required = false)
    public List<Link> links;

    @ElementList(name = "item", required = true, inline = true)
    public List<Item> itemList;


    @Element
    String title;
    @Element
    String language;

    @Element(name = "ttl", required = false)
    int ttl;

    @Element(name = "pubDate", required = false)
    String pubDate;

    @Override
    public String toString() {
        return "Channel{" +
                "links=" + links +
                ", itemList=" + itemList +
                ", title='" + title + '\'' +
                ", language='" + language + '\'' +
                ", ttl=" + ttl +
                ", pubDate='" + pubDate + '\'' +
                '}';
    }

    public static class Link {
        @Attribute(required = false)
        public String href;

        @Attribute(required = false)
        public String rel;

        @Attribute(name = "type", required = false)
        public String contentType;

        @Text(required = false)
        public String link;
    }

    @Root(name = "item", strict = false)
    public static class Item {

        @Element(name = "title", required = true)
        String title;//The title of the item.	Venice Film Festival Tries to Quit Sinking
        @Element(name = "link", required = true)
        String link;//The URL of the item.	http://www.nytimes.com/2002/09/07/movies/07FEST.html
        @Element(name = "description", required = true)
        String description;//The item synopsis.	Some of the most heated chatter at the Venice Film Festival this week was about the way that the arrival of the stars at the Palazzo del Cinema was being staged.
        @Element(name = "author", required = false)
        String author;//Email address of the author of the item. More.	[email protected]
        @Element(name = "category", required = false)
        String category;//Includes the item in one or more categories. More.	Simpsons Characters
        @Element(name = "comments", required = false)
        String comments;//URL of a page for comments relating to the item. More.	http://www.myblog.org/cgi-local/mt/mt-comments.cgi?entry_id=290
        @Element(name = "enclosure", required = false)
        String enclosure;//	Describes a media object that is attached to the item. More.	<enclosure url="http://live.curry.com/mp3/celebritySCms.mp3" length="1069871" type="audio/mpeg"/>
        @Element(name = "guid", required = false)
        String guid;//A string that uniquely identifies the item. More.	<guid isPermaLink="true">http://inessential.com/2002/09/01.php#a2</guid>
        @Element(name = "pubDate", required = false)
        String pubDate;//	Indicates when the item was published. More.	Sun, 19 May 2002 15:21:36 GMT
        @Element(name = "source", required = false)
        String source;//	The RSS channel that the item came from. More.

        @Override
        public String toString() {
            return "Item{" +
                    "title='" + title + '\'' +
                    ", link='" + link + '\'' +
                    ", description='" + description + '\'' +
                    ", author='" + author + '\'' +
                    ", category='" + category + '\'' +
                    ", comments='" + comments + '\'' +
                    ", enclosure='" + enclosure + '\'' +
                    ", guid='" + guid + '\'' +
                    ", pubDate='" + pubDate + '\'' +
                    ", source='" + source + '\'' +
                    '}';
        }
    }
}

RestAdapterUtil.java

   public static <T> T createXmlAdapterFor(final Class<T> api, final String endpoint, final Client client) {
        Preconditions.checkNotNull(client);
        Preconditions.checkNotNull(endpoint);
        //
        final RestAdapter.LogLevel level = getLogLevel();
        Log.d(LOG_TAG, "Log Level:" + level);
        final RestAdapter adapter = new RestAdapter.Builder()//
                .setEndpoint(endpoint)//
                .setConverter(new SimpleXMLConverter())//
                .setClient(client)//
                .setLogLevel(level)//
                .build();
        //
        return adapter.create(api);
    }

RSS.java

import org.simpleframework.xml.Attribute;
import org.simpleframework.xml.Element;
import org.simpleframework.xml.Root;

@Root
public class RSS {

    @Attribute
    String version;

    @Element
    Channel channel;


    public Channel getChannel() {
        return channel;
    }

    @Override
    public String toString() {
        return "RSS{" +
                "version='" + version + '\'' +
                ", channel=" + channel +
                '}';
    }
}

Using RX Java to receive the Feed

        final String baseURL = getString(YOU_ENDPOINT_URL);
        final Client client = RestAdapterUtil.createOKClient();
        endpoint = RestAdapterUtil.createXmlAdapterFor(Endpoint.class, baseURL, client);
        final Observable<RSS> events = endpoint.getRSSFeed();

I am sorry for dumb question, how did you get endpoint.getRSSFeed()?

Oh, great! I was thinking of writing it on my own right now but you did a pretty nice job here.
@Jawnnypoo I don't know whether it's a good practice but I always exclude models from Proguard. It's a way to avoid problems.

Here is example using Retrofit2 if anybody is wondering...

    public static <T> T createXmlAdapterFor(final Class<T> api, final String endpoint) {
        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl(endpoint)
                .client(new OkHttpClient()) // Use OkHttp3 client
                .addCallAdapterFactory(RxJavaCallAdapterFactory.create()) // RxJava adapter
                .addConverterFactory(SimpleXmlConverterFactory.create()) // Simple XML converter
                .build();
        return retrofit.create(api);
    }

And the retrofit 2 service API

public interface RssFeedService {
    /**
     * Provides RSS feed data.
     * @param feedUrl RSS Feed URL. Note: This must be fully qualified URL.
     * @return RSS Feed
     */
    @GET
    Observable<RSS> getFeed(@Url String feedUrl);
}

And finally call with retrofit

        RssFeedService xmlAdapterFor = ApiService.createXmlAdapterFor(RssFeedService.class, "http://www.thestar.com/");
        Observable<RSS> rssObservable = xmlAdapterFor.getFeed("http://www.thestar.com/feeds.topstories.rss");
        rssObservable.subscribe(new Subscriber<RSS>() {
            @Override
            public void onCompleted() {
                Log.d(TAG, "onCompleted() called");
            }

            @Override
            public void onError(final Throwable e) {
                Log.d(TAG, "onError() called with: e = [" + e + "]");
            }

            @Override
            public void onNext(final RSS rss) {
                Log.d(TAG, "onNext() called with: rss = [" + rss + "]");
            }
        });

And here is my gradle dependency for retrofit

    // Retrofit - retrofitVersion = '2.1.0'
    compile "com.squareup.retrofit2:retrofit:$rootProject.retrofitVersion"
    compile "com.squareup.retrofit2:converter-gson:$rootProject.retrofitVersion"
    compile "com.squareup.retrofit2:converter-scalars:$rootProject.retrofitVersion"
    compile ("com.squareup.retrofit2:converter-simplexml:$rootProject.retrofitVersion") {
        // https://github.com/square/retrofit/tree/master/retrofit-converters/simplexml
        // exclude the following transitive dependencies: stax:stax-api, stax:stax, and xpp3:xpp3
        exclude group: 'xpp3', module: 'xpp3'
        exclude group: 'stax', module: 'stax-api'
        exclude group: 'stax', module: 'stax'
    }
    compile "com.squareup.retrofit2:adapter-rxjava:$rootProject.retrofitVersion"

It helped a lot, thanks!

Thank you very much for this!

It helped me thanks

You can try https://github.com/faruktoptas/RetrofitRssConverterFactory

@macsystems I have added fields for the popular rss content module. Maybe they will be useful for other people as well and you might want to add them here (since PRs are not possible for gists)