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Wie erstelle ich einen RSS-Reader für Android?

Ich bin neu in Android und versuche, einen RSS-Reader für Android zu erstellen. Ich habe alle Klassen und XML-Dateien erstellt, aber es gibt nicht die erforderliche Ausgabe. Es zeigt nur die Nachricht No RSS feed available.

Bitte kann jemand vorschlagen, was ich tun soll.

Hier ist der Code, den ich aus dem Tutorial genommen und versucht habe zu manipulieren-

public final String RSSFEEDOFCHOICE = "http://blog.01synergy.com/feed/";

public final String tag = "RSSReader";
private RSSFeed feed = null;

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

public void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    setContentView(R.layout.main);

    // go get our feed!
    feed = getFeed(RSSFEEDOFCHOICE);

    // display UI
    UpdateDisplay();

}


private RSSFeed getFeed(String urlToRssFeed)
{
    try
    {
        // setup the url
       URL url = new URL(urlToRssFeed);

       // create the factory
       SAXParserFactory factory = SAXParserFactory.newInstance();
       // create a parser
       SAXParser parser = factory.newSAXParser();

       // create the reader (scanner)
       XMLReader xmlreader = parser.getXMLReader();
       // instantiate our handler
       RSSHandler theRssHandler = new RSSHandler();
       // assign our handler
       xmlreader.setContentHandler(theRssHandler);
       // get our data via the url class
       InputSource is = new InputSource(url.openStream());
       // perform the synchronous parse           
       xmlreader.parse(is);
       // get the results - should be a fully populated RSSFeed instance, or null on error
       return theRssHandler.getFeed();
    }
    catch (Exception ee)
    {
        // if we have a problem, simply return null
        return null;
    }
}
public boolean onCreateOptionsMenu(Menu menu) 
{
    super.onCreateOptionsMenu(menu);

    menu.add(0,0,0, "Choose RSS Feed");
    menu.add(0,1,0, "Refresh");
    Log.i(tag,"onCreateOptionsMenu");
    return true;
}

public boolean onOptionsItemSelected(Menu item){
    switch (((View) item).getId()) {
    case 0:

        Log.i(tag,"Set RSS Feed");
        return true;
    case 1:
        Log.i(tag,"Refreshing RSS Feed");
        return true;
    }
    return false;
}


private void UpdateDisplay()
{
    TextView feedtitle = (TextView) findViewById(R.id.feedtitle);
    TextView feedpubdate = (TextView) findViewById(R.id.feedpubdate);
    ListView itemlist = (ListView) findViewById(R.id.itemlist);


    if (feed == null)
    {
        feedtitle.setText("No RSS Feed Available");
        return;
    }

    feedtitle.setText(feed.getTitle());
    feedpubdate.setText(feed.getPubDate());

    ArrayAdapter<RSSItem> adapter = new ArrayAdapter<RSSItem>(this,Android.R.layout.simple_list_item_1,feed.getAllItems());

    itemlist.setAdapter(adapter);

    itemlist.setOnItemClickListener(this);

    itemlist.setSelection(0);

}


 public void onItemClick(AdapterView parent, View v, int position, long id)
 {
     Log.i(tag,"item clicked! [" + feed.getItem(position).getTitle() + "]");

     Intent itemintent = new Intent(this,ShowDescription.class);

     Bundle b = new Bundle();
     b.putString("title", feed.getItem(position).getTitle());
     b.putString("description", feed.getItem(position).getDescription());
     b.putString("link", feed.getItem(position).getLink());
     b.putString("pubdate", feed.getItem(position).getPubDate());

     itemintent.putExtra("Android.intent.extra.INTENT", b);

     startSubActivity(itemintent,0);
 }


private void startSubActivity(Intent itemintent, int i) {
    // TODO Auto-generated method stub

}

}
16
Avi kumar

Überprüfen Sie den folgenden Link: Es ist ein Open-Source-RSS-Reader für Android. Sie können Code als Referenz herunterladen

http://code.google.com/p/Android-rss/

5
Ketan Parmar

Dies ist meine erste Herangehensweise an den RSS-Reader. Er ist nicht so dynamisch und hat Boilerplate-Code, der für mich jedoch gut funktioniert hat.

Verwendungszweck:

RssParser parser = new RssParser(feedUrl);
Log.i("LOG", "Description: " + parser.getItem(3).description); //4th item's description

Klasse:

package com.uncocoder.course.app.feed_reader;

import Java.io.IOException;
import Java.net.URL;
import Java.util.ArrayList;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;
import Android.util.Log;


public class RssParser extends DefaultHandler {

    private StringBuilder   content;
    private boolean         inChannel;
    private boolean         inImage;
    private boolean         inItem;

    private ArrayList<Item> items   = new ArrayList<Item>();
    private Channel         channel = new Channel();

    private Item            lastItem;


    public RssParser(String url) {
        try {
            SAXParserFactory spf = SAXParserFactory.newInstance();
            SAXParser sp = spf.newSAXParser();
            XMLReader xr = sp.getXMLReader();
            URL sourceUrl = new URL(url);
            xr.setContentHandler(this);
            xr.parse(new InputSource(sourceUrl.openStream()));
        }
        catch (ParserConfigurationException e) {
            e.printStackTrace();
        }
        catch (SAXException e) {
            e.printStackTrace();
        }
        catch (IOException e) {
            e.printStackTrace();
        }
    }


    public class Item {

        public String title;
        public String description;
        public String link;
        public String category;
        public String pubDate;
        public String guid;
    }


    public class Channel {

        public String title;
        public String description;
        public String link;
        public String lastBuildDate;
        public String generator;
        public String imageUrl;
        public String imageTitle;
        public String imageLink;
        public String imageWidth;
        public String imageHeight;
        public String imageDescription;
        public String language;
        public String copyright;
        public String pubDate;
        public String category;
        public String ttl;
    }


    @Override
    public void startDocument() throws SAXException {
        Log.i("LOG", "StartDocument");
    }


    @Override
    public void endDocument() throws SAXException {
        Log.i("LOG", "EndDocument");
    }


    @Override
    public void startElement(String uri, String localName, String qName, Attributes atts) throws SAXException {
        if (localName.equalsIgnoreCase("image")) {
            inImage = true;
        }

        if (localName.equalsIgnoreCase("channel")) {
            inChannel = true;
        }

        if (localName.equalsIgnoreCase("item")) {
            lastItem = new Item();
            items.add(lastItem);
            inItem = true;
        }

        content = new StringBuilder();
    }


    @Override
    public void endElement(String uri, String localName, String qName) throws SAXException {
        if (localName.equalsIgnoreCase("image")) {
            inImage = false;
        }

        if (localName.equalsIgnoreCase("channel")) {
            inChannel = false;
        }

        if (localName.equalsIgnoreCase("item")) {
            inItem = false;
        }

        if (localName.equalsIgnoreCase("title")) {
            if (content == null) {
                return;
            }

            if (inItem) {
                lastItem.title = content.toString();
            } else if (inImage) {
                channel.imageTitle = content.toString();
            } else if (inChannel) {
                channel.title = content.toString();
            }

            content = null;
        }

        if (localName.equalsIgnoreCase("description")) {
            if (content == null) {
                return;
            }

            if (inItem) {
                lastItem.description = content.toString();
            } else if (inImage) {
                channel.imageDescription = content.toString();
            } else if (inChannel) {
                channel.description = content.toString();
            }

            content = null;
        }

        if (localName.equalsIgnoreCase("link")) {
            if (content == null) {
                return;
            }

            if (inItem) {
                lastItem.link = content.toString();
            } else if (inImage) {
                channel.imageLink = content.toString();
            } else if (inChannel) {
                channel.link = content.toString();
            }

            content = null;
        }

        if (localName.equalsIgnoreCase("category")) {
            if (content == null) {
                return;
            }

            if (inItem) {
                lastItem.category = content.toString();
            } else if (inChannel) {
                channel.category = content.toString();
            }

            content = null;
        }

        if (localName.equalsIgnoreCase("pubDate")) {
            if (content == null) {
                return;
            }

            if (inItem) {
                lastItem.pubDate = content.toString();
            } else if (inChannel) {
                channel.pubDate = content.toString();
            }

            content = null;
        }

        if (localName.equalsIgnoreCase("guid")) {
            if (content == null) {
                return;
            }

            lastItem.guid = content.toString();
            content = null;
        }

        if (localName.equalsIgnoreCase("url")) {
            if (content == null) {
                return;
            }

            channel.imageUrl = content.toString();
            content = null;
        }

        if (localName.equalsIgnoreCase("width")) {
            if (content == null) {
                return;
            }

            channel.imageWidth = content.toString();
            content = null;
        }

        if (localName.equalsIgnoreCase("height")) {
            if (content == null) {
                return;
            }

            channel.imageHeight = content.toString();
            content = null;
        }

        if (localName.equalsIgnoreCase("language")) {
            if (content == null) {
                return;
            }

            channel.language = content.toString();
            content = null;
        }

        if (localName.equalsIgnoreCase("copyright")) {
            if (content == null) {
                return;
            }

            channel.copyright = content.toString();
            content = null;
        }

        if (localName.equalsIgnoreCase("ttl")) {
            if (content == null) {
                return;
            }

            channel.ttl = content.toString();
            content = null;
        }
    }


    @Override
    public void characters(char[] ch, int start, int length) throws SAXException {
        if (content == null) {
            return;
        }

        content.append(ch, start, length);
    }


    public Item getItem(int index) {
        return items.get(index);
    }
}
11
Behnam

Es gibt ein Tutorial (einschließlich des kompletten Quellcodes) zum Erstellen eines Android-RSS-Reders hier:

Teil 1 (vollständige Bewerbung)

Teil 2 (Anwendung aktualisiert, um Bild-Tags von der Beschreibung zu analysieren)

Teil 3 (Anwendungsupdate mit Android 3.0)

Das Lernprogramm verwendet den SAX-Parser und enthält ein komplettes Android-Projekt, das auf einen RSS-Feed zugreift und den Feed in einer Listenansicht anzeigt.

Es scheint immer noch viele Leute zu geben, die daran interessiert sind - wenn Sie also nach einem Android 3.0+ mit Fragmenten/Async-Aufgaben usw. sowie vollständigem Anwendungscode suchen, habe ich die Einträge erneut aktualisiert und sie können es sein hier gefunden!

4
rhinds

Sie können mein Projekt unter google-play herunterladen und überprüfen. Bei diesem Projekt geht es um einige türkische Sportkanäle. Viele Kanäle sind in einer Anwendung.

Sie können den Quellcode des Projekts auf github überprüfen.

2
AknKplnoglu

Analysieren Sie diese Art von RSS-Feeds einfach mit XmlPullParser

 Parse this type of Rss Feeds easily using <code>XmlPullParser</code>

     public class RSSParser {

public static ArrayList<Pojo> getParserData(String Data){
    try {
        RSSXMLTag currentTag = null;
        ArrayList<Pojo> postDataList = new ArrayList<>();
        XmlPullParserFactory factory = XmlPullParserFactory
                .newInstance();
        factory.setNamespaceAware(true);
        XmlPullParser xpp = factory.newPullParser();
        xpp.setInput(new StringReader(Data));

        int eventType = xpp.getEventType();
        Pojo pdData = null;
        SimpleDateFormat dateFormat = new SimpleDateFormat(
                "EEEE, DD MMM yyyy ");
        while (eventType != XmlPullParser.END_DOCUMENT) {
            int i = 0;
            if (eventType == XmlPullParser.START_DOCUMENT) {

            } else if (eventType == XmlPullParser.START_TAG) {
                if (xpp.getName().equals("item")) {

                    pdData = new Pojo();

                    currentTag = RSSXMLTag.IGNORETAG;
                } else if (xpp.getName().equals("title")) {
                    currentTag = RSSXMLTag.TITLE;
                } else if (xpp.getName().equals("link")) {
                    currentTag = RSSXMLTag.LINK;
                } else if (xpp.getName().equals("pubDate")) {
                    currentTag = RSSXMLTag.DATE;
                } else if (xpp.getName().equals("creator")) {

                    currentTag = RSSXMLTag.CREATOR;
                } else if (xpp.getName().equals("category")) {
                    currentTag = RSSXMLTag.CATEGORY;
                } else if (xpp.getName().equals("description")) {
                    currentTag = RSSXMLTag.DESCRIPTION;
                }
            } else if (eventType == XmlPullParser.END_TAG) {
                if (xpp.getName().equals("item")) {
                    // format the data here, otherwise format data in
                    // Adapter
                    Date postDate = dateFormat.parse(pdData.postDate);
                    pdData.postDate = dateFormat.format(postDate);
                    postDataList.add(pdData);
                } else {
                    currentTag = RSSXMLTag.IGNORETAG;
                }
            } else if (eventType == XmlPullParser.TEXT) {
                String content = xpp.getText();
                content = content.trim();
                Log.d("debug", content);
                if (pdData != null) {
                    switch (currentTag) {
                        case TITLE:
                            if (content.length() != 0) {
                                if (pdData.postTitle != null) {
                                    pdData.postTitle += content;
                                } else {
                                    pdData.postTitle = content;
                                }
                            }
                            break;
                        case LINK:
                            if (content.length() != 0) {
                                if (pdData.postLink != null) {
                                    pdData.postLink += content;
                                } else {
                                    pdData.postLink = content;
                                }
                            }
                            break;
                        case DATE:
                            if (content.length() != 0) {
                                if (pdData.postDate != null) {
                                    pdData.postDate += content;
                                } else {
                                    pdData.postDate = content;
                                }
                            }
                            break;
                        case CATEGORY:
                            if (content.length() != 0) {
                                if (pdData.postCategory != null) {
                                    i = i + 1;
                                    if (i == 1) {
                                        pdData.postCategory = content;
                                    }
                                } else {
                                    i = i + 1;
                                    if (i == 1) {
                                        pdData.postCategory = content;
                                    }
                                }
                            }
                            break;
                        case DESCRIPTION:
                            if (content.length() != 0) {
                                if (pdData.postDescription != null) {
                                    String s = content;

                                    String string = s.substring(s.indexOf("src=\"") + 5, s.indexOf("\" class=\""));
                                    pdData.postDescription += string;
                                } else {
                                    String s = content;

                                    String string = s.substring(s.indexOf("src=\"") + 5, s.indexOf("\" class=\""));
                                    pdData.postDescription = string;
                                }
                            }
                            break;
                        case CREATOR:
                            if (content.length() != 0) {
                                if (pdData.postCreator != null) {
                                    pdData.postCreator += content;
                                } else {
                                    pdData.postCreator = content;
                                }
                            }
                            break;
                        default:
                            break;
                    }
                }
            }

            eventType = xpp.next();
        }
        return postDataList;
    }catch (Exception e){
        e.printStackTrace();
    }

    return null;
}

public enum RSSXMLTag {
    IGNORETAG, TITLE, LINK, DATE,CREATOR,CATEGORY, DESCRIPTION;
}


public class Pojo {


public String getPostTitle() {
    return postTitle;
}

public void setPostTitle(String postTitle) {
    this.postTitle = postTitle;
}

public String getPostLink() {
    return postLink;
}

public void setPostLink(String postLink) {
    this.postLink = postLink;
}

public String getPostDate() {
    return postDate;
}

public void setPostDate(String postDate) {
    this.postDate = postDate;
}

public String getPostCategory() {
    return postCategory;
}

public void setPostCategory(String postCategory) {
    this.postCategory = postCategory;
}

public String getPostDescription() {
    return postDescription;
}

public void setPostDescription(String postDescription) {
    this.postDescription = postDescription;
}

public String getPostCreator() {
    return postCreator;
}

public void setPostCreator(String postCreator) {
    this.postCreator = postCreator;
}

public String postTitle;

public String postLink;

public String postDate;

public String postCategory;

public String postDescription;
public String postCreator;
}


}
0
Aman Jham