Android Practices: xml parsing

rss_feed_view.xml

rss_list_item.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <TextView
        android:id="@+id/rss_title_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="17dp"
        android:layout_marginTop="14dp"
        android:text="NDTV"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:textColor="@android:color/black" />

</RelativeLayout>

RSSFeed.java

public class RSSFeed implements Serializable {

    private String title;
    private String link;
    private String description;
    private String category;
    private String pubDate;
    private String guid;
    private String feedburnerOrigLink;

    public RSSFeed() {
    }

    public RSSFeed(String title, String link, String description, String category, String pubDate,
            String guid, String feedburnerOrigLink) {
        this.title = title;
        this.link = link;
        this.description = description;
        this.category = category;
        this.pubDate = pubDate;
        this.guid = guid;
        this.feedburnerOrigLink = feedburnerOrigLink;
    }

    public String getTitle() {
        return title;
    }

    public String getLink() {
        return link;
    }

    public String getDescription() {
        return description;
    }

    public String getCategory() {
        return category;
    }

    public String getPubDate() {
        return pubDate;
    }

    public String getGuid() {
        return guid;
    }

    public String getFeedburnerOrigLink() {
        return feedburnerOrigLink;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public void setLink(String link) {
        this.link = link;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public void setCategory(String category) {
        this.category = category;
    }

    public void setPubDate(String pubDate) {
        this.pubDate = pubDate;
    }

    public void setGuid(String guid) {
        this.guid = guid;
    }

    public void setFeedburnerOrigLink(String feedburnerOrigLink) {
        this.feedburnerOrigLink = feedburnerOrigLink;
    }
}

NewsFeedParser.java

import com.rajeshvijayakumar.model.RSSFeed;

public class NewsFeedParser {
    private InputStream urlStream;
    private XmlPullParserFactory factory;
    private XmlPullParser parser;

    private List<RSSFeed> rssFeedList;
    private RSSFeed rssFeed;

    private String urlString;
    private String tagName;

    private String title;
    private String link;
    private String description;
    private String category;
    private String pubDate;
    private String guid;
    private String feedburner;

    public static final String ITEM = "item";
    public static final String CHANNEL = "channel";

    public static final String TITLE = "title";
    public static final String LINK = "link";
    public static final String DESCRIPTION = "description";
    public static final String CATEGORY = "category";
    public static final String PUBLISHEDDATE = "pubDate";
    public static final String GUID = "guid";
    public static final String FEEDBURNERORIGLINK = "feedburner:origLink";


    public NewsFeedParser(String urlString) {
        this.urlString = urlString;
    }

    public static InputStream downloadUrl(String urlString) throws IOException {
        URL url = new URL(urlString);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setRequestMethod("GET");
        conn.setDoInput(true);
        conn.connect();
        InputStream stream = conn.getInputStream();
        return stream;
    }

    public List<RSSFeed> parse() {
        try {
            int count = 0;
            factory = XmlPullParserFactory.newInstance();
            parser = factory.newPullParser();
            urlStream = downloadUrl(urlString);
            parser.setInput(urlStream, null);
            int eventType = parser.getEventType();
            boolean done = false;
            rssFeed = new RSSFeed();
            rssFeedList = new ArrayList<RSSFeed>();
            while (eventType != XmlPullParser.END_DOCUMENT && !done) {
                tagName = parser.getName();

                switch (eventType) {
                    case XmlPullParser.START_DOCUMENT:
                        break;
                    case XmlPullParser.START_TAG:
                        if (tagName.equals(ITEM)) {
                            rssFeed = new RSSFeed();
                        }
                        if (tagName.equals(TITLE)) {
                            title = parser.nextText().toString();
                        }
                        if (tagName.equals(LINK)) {
                            link = parser.nextText().toString();
                        }
                        if (tagName.equals(DESCRIPTION)) {
                            description = parser.nextText().toString();
                        }
                        if (tagName.equals(CATEGORY)) {
                            category = parser.nextText().toString();
                        }
                        if (tagName.equals(PUBLISHEDDATE)) {
                            pubDate = parser.nextText().toString();
                        }
                        if (tagName.equals(GUID)) {
                            guid = parser.nextText().toString();
                        }
                        if (tagName.equals(FEEDBURNERORIGLINK)) {
                            feedburner = parser.nextText().toString();
                        }
                        break;
                    case XmlPullParser.END_TAG:
                        if (tagName.equals(CHANNEL)) {
                            done = true;
                        } else if (tagName.equals(ITEM)) {
                            rssFeed = new RSSFeed(title, link, description, category, pubDate,                               guid, feedburner);
                            rssFeedList.add(rssFeed);
                        }
                        break;
                }
                eventType = parser.next();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        return rssFeedList;
    }
}

MainActivity.java

package com.rajeshvijayakumar.xmlpullparser;

import com.rajeshvijayakumar.model.RSSFeed;
import com.rajeshvijayakumar.parser.NewsFeedParser;

public class MainActivity extends Activity implements OnItemClickListener {

    private ListView mRssListView;
    private NewsFeedParser mNewsFeeder;
    private List<RSSFeed> mRssFeedList;
    private RssAdapter mRssAdap;

    private static final String TOPSTORIES =
            "http://feeds.feedburner.com/NdtvNews-TopStories?format=xml";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.rss_feed_view);

        mRssListView = (ListView) findViewById(R.id.rss_list_view);
        mRssFeedList = new ArrayList<RSSFeed>();
        new DoRssFeedTask().execute(TOPSTORIES);
        mRssListView.setOnItemClickListener(this);
    }

    private class RssAdapter extends ArrayAdapter<RSSFeed> {
        private List<RSSFeed> rssFeedLst;

        public RssAdapter(Context context, int textViewResourceId, List<RSSFeed> rssFeedLst) {
            super(context, textViewResourceId, rssFeedLst);
            this.rssFeedLst = rssFeedLst;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {

            View view = convertView;
            RssHolder rssHolder = null;
            if (convertView == null) {
                view = View.inflate(MainActivity.this, R.layout.rss_list_item, null);
                rssHolder = new RssHolder();
                rssHolder.rssTitleView = (TextView) view.findViewById(R.id.rss_title_view);
                view.setTag(rssHolder);
            } else {
                rssHolder = (RssHolder) view.getTag();
            }
            RSSFeed rssFeed = rssFeedLst.get(position);
            rssHolder.rssTitleView.setText(rssFeed.getTitle());
            return view;
        }
    }

    static class RssHolder {
        public TextView rssTitleView;
    }

    public class DoRssFeedTask extends AsyncTask<String, Void, List<RSSFeed>> {
        ProgressDialog prog;
        String jsonStr = null;
        Handler innerHandler;

        @Override
        protected void onPreExecute() {
            prog = new ProgressDialog(MainActivity.this);
            prog.setMessage("Loading....");
            prog.show();
        }

        @Override
        protected List<RSSFeed> doInBackground(String... params) {
            for (String urlVal : params) {
                mNewsFeeder = new NewsFeedParser(urlVal);
            }
            mRssFeedList = mNewsFeeder.parse();
            return mRssFeedList;
        }

        @Override
        protected void onPostExecute(List<RSSFeed> result) {
            prog.dismiss();
            runOnUiThread(new Runnable() {

                @Override
                public void run() {
                    mRssAdap = new RssAdapter(MainActivity.this, R.layout.rss_list_item,
                            mRssFeedList);
                    int count = mRssAdap.getCount();
                    if (count != 0 && mRssAdap != null) {
                        mRssListView.setAdapter(mRssAdap);
                    }
                }
            });
        }

        @Override
        protected void onProgressUpdate(Void... values) {
        }
    }

    @Override
    public void onItemClick(AdapterView<?> adapterView, View v, int position, long id) {
    }
}
Add this Permission in your Manifest.xml file of your project

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

Output :

Source Code : Download this Example Here

Android Practices

Sunday, 14 April 2013

Xml Pull Parser Example in Android