Android RSS Feed Reader Example

What is RSS FEED?

  *   RSS(originally RDF Site Summary, often dubbed Really Simple Syndication) is a family of webfeed formats used to publish frequently updated works—such as blog entries, news headlines, audio, and video—in a standardized format.

 *   An RSS document (which is called a "feed", "web feed", or "channel") includes full or summarized text, plus metadata such as publishing dates and authorship.

 *  Many news-related sites, weblogs and other online publishers syndicate their content as an RSS Feed to whoever wants it. 

RSS URL : http://feeds.feedburner.com/iamvijayakumar/androidtutorial 
i write code for my blog rss feed reader applcation . In this application every day it will update if any new post added in my blog.

Screen Shot: 

Normal Mode

Sort Mode

Activity code: 

public class RssFeedReaderActivity extends Activity {

/** Called when the activity is first created. */

ListView _rssFeedListView;

List jobs ;

List rssStr ;

private RssReaderListAdapter _adapter;

String sorti = "";

String mode = "";

Button sort_Btn;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.rssfeedreaderactivity);

_rssFeedListView = (ListView)findViewById(R.id.rssfeed_listview);

sort_Btn = (Button)findViewById(R.id.sort);

sort_Btn.setText("Change Sorting Mode");

sort_Btn.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

if(sorti.equalsIgnoreCase("")){

sorti = "sort";

}

if(sorti.equalsIgnoreCase("sort")){

sorti = "sort";

sort_Btn.setText("Change Reverse Mode");

RssFeedTask rssTask = new RssFeedTask();

rssTask.execute();

}

else if(sorti.equalsIgnoreCase("reverse")){

sorti = "reverse";

sort_Btn.setText("Change Normal Mode");

RssFeedTask rssTask = new RssFeedTask();

rssTask.execute();

}

else if(sorti.equalsIgnoreCase("normal")){

sort_Btn.setText("Change Sorting Mode");

RssFeedTask rssTask = new RssFeedTask();

rssTask.execute();

}

}

});

RssFeedTask rssTask = new RssFeedTask();

rssTask.execute();

}

private class RssFeedTask extends AsyncTask {

// private String Content;

private ProgressDialog Dialog;

String response = "";

@Override

protected void onPreExecute() {

Dialog = new ProgressDialog(RssFeedReaderActivity.this);

Dialog.setMessage("Rss Loading...");

Dialog.show();

}

@Override

protected String doInBackground(String... urls) {

try {

String feed = "http://feeds.feedburner.com/iamvijayakumar/androidtutorial";

XmlHandler rh = new XmlHandler();

rssStr = rh.getLatestArticles(feed);

} catch (Exception e) {

}

return response;

}

@Override

protected void onPostExecute(String result) {

if(sorti.equalsIgnoreCase("sort")){

sorti = "reverse";

Collections.sort(rssStr, new SortingOrder());

}else if(sorti.equalsIgnoreCase("reverse")){

sorti = "normal";

Comparator comp = Collections.reverseOrder();

Collections.sort(rssStr, new ReverseOrder());

}else{

sorti = "";

}

if(rssStr != null){

_adapter = new RssReaderListAdapter(RssFeedReaderActivity.this,rssStr);

_rssFeedListView.setAdapter(_adapter);

}

Dialog.dismiss();

}

}

}

 XML handler class

--> 

public class XmlHandler extends DefaultHandler {

private RssFeedStructure feedStr = new RssFeedStructure();

private List rssList = new ArrayList();

private int articlesAdded = 0;

// Number of articles to download

private static final int ARTICLES_LIMIT = 25;

StringBuffer chars = new StringBuffer();

public void startElement(String uri, String localName, String qName, Attributes atts) {

chars = new StringBuffer();

if (qName.equalsIgnoreCase("media:content"))

{

if(!atts.getValue("url").toString().equalsIgnoreCase("null")){

feedStr.setImgLink(atts.getValue("url").toString());

}

else{

feedStr.setImgLink("");

}

}

}

public void endElement(String uri, String localName, String qName) throws SAXException {

if (localName.equalsIgnoreCase("title"))

{

feedStr.setTitle(chars.toString());

}

else if (localName.equalsIgnoreCase("description"))

{

feedStr.setDescription(chars.toString());

}

else if (localName.equalsIgnoreCase("pubDate"))

{

feedStr.setPubDate(chars.toString());

}

else if (localName.equalsIgnoreCase("encoded"))

{

feedStr.setEncodedContent(chars.toString());

}

else if (qName.equalsIgnoreCase("media:content"))

{

}

else if (localName.equalsIgnoreCase("link"))

{

}

if (localName.equalsIgnoreCase("item")) {

rssList.add(feedStr);

feedStr = new RssFeedStructure();

articlesAdded++;

if (articlesAdded >= ARTICLES_LIMIT)

{

throw new SAXException();

}

}

}

public void characters(char ch[], int start, int length) {

chars.append(new String(ch, start, length));

}

public List getLatestArticles(String feedUrl) {

URL url = null;

try {

SAXParserFactory spf = SAXParserFactory.newInstance();

SAXParser sp = spf.newSAXParser();

XMLReader xr = sp.getXMLReader();

url = new URL(feedUrl);

xr.setContentHandler(this);

xr.parse(new InputSource(url.openStream()));

} catch (IOException e) {

} catch (SAXException e) {

} catch (ParserConfigurationException e) {

}

return rssList;

}

}

Layout Code

 

-->xml version="1.0" encoding="utf-8"?> 

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:background="#5D5C5C"

android:orientation="vertical" >

<LinearLayout

android:layout_width="fill_parent"

android:background="@layout/shape"

android:layout_height="40dip"

>

<TextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:textColor="#FFFFFF"

android:layout_marginTop="2dip"

android:layout_marginLeft="30dip"

android:gravity="center"

android:textSize="8pt"

android:textStyle="bold"

android:layout_gravity="center"

android:text="iamvijayakumar.blogspot.com"

/>

</LinearLayout>

<ListView

android:layout_width="fill_parent"

android:layout_height="390dip"

android:id="@+id/rssfeed_listview"

android:background="#5D5C5C"

android:cacheColorHint="#00000000"

android:divider="#000000"

android:dividerHeight="1dip"

android:paddingLeft="5pt"

android:paddingRight="5pt"

android:transcriptMode="alwaysScroll"

></ListView>

<LinearLayout

android:layout_width="fill_parent"

android:background="#000000"

android:gravity="bottom"

android:layout_gravity="bottom"

android:layout_height="wrap_content"

>

<Button

android:layout_height="wrap_content"

android:layout_width="fill_parent"

android:text="Sort"

android:id="@+id/sort"

/>

</LinearLayout>

</LinearLayout>

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