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| * RSS Demon requires that you add the kXML library to your project. | | * RSS Demon requires that you add the kXML library to your project. |
| * Download kXML2 here: http://sourceforge.net/project/showfiles.php?group_id=9157&package_id=58653 | | * Download kXML2 here: http://sourceforge.net/project/showfiles.php?group_id=9157 |
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| <pre>
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| /**
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| * RSS Demon
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| * a modified version of my XMLDemon example uses kXML2 to parse RSS feeds
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| *
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| * NOTE: Uses techniques and code from Tommi Laukkanen's RSS Reader - http://www.substanceofcode.com
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| * copyleft Michael Sharon 2006
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| */
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| package my;
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| import java.io.*;
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| import java.util.Vector;
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| import org.kxml2.io.*;
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| import org.xmlpull.v1.*;
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| import javax.microedition.midlet.*;
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| import javax.microedition.lcdui.*;
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| import javax.microedition.io.*;
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| public class RSSDemon extends MIDlet implements CommandListener {
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| //add any RSS feed here
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|
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| //NY Times Music Feed
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| static final String rssFeedURL = "http://www.nytimes.com/services/xml/rss/nyt/Music.xml";
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|
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| //BBC News Feed
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| //static final String rssFeedURL = "http://newsrss.bbc.co.uk/rss/newsonline_world_edition/front_page/rss.xml";
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|
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| //An empty feed which will cause an error
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| //static final String rssFeedURL = "http://uberthings.com/teaching/mobile_application_design/7/empty.xml";
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|
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| //BBC
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| //The title of your RSS feed
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| static final String TITLE = "NY Times Music";
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| //Vector stores a variable number of items from the feed
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| Vector foundItems = new Vector();
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|
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| //Holds all our items
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| List itemList = new List(TITLE, Choice.IMPLICIT);
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|
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| TextBox textBox = new TextBox("", "", 256, TextField.ANY);
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|
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| Display display;
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| Command backCmd = new Command("Back", Command.BACK, 0);
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| public void startApp() {
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|
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| //get a reference to the display object
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| display = Display.getDisplay(this);
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|
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| //set up listeners and commands
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| itemList.setCommandListener(this);
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| textBox.setCommandListener(this);
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| textBox.addCommand(backCmd);
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|
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| //show the list of items
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| display.setCurrent(itemList);
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|
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| //create a new thread and start it
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| new ReadThread().start();
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| }
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| public void pauseApp() {
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| }
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| public void commandAction(Command c, Displayable d) {
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| if (c == List.SELECT_COMMAND) {
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| //retrieve the specific item that we have selected
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| String text = (String) foundItems.elementAt(itemList.getSelectedIndex());
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| if (textBox.getMaxSize() < text.length())
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| textBox.setMaxSize(text.length());
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| textBox.setString(text);
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| display.setCurrent(textBox);
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| } else if (c == backCmd)
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| display.setCurrent(itemList);
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| }
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| public void destroyApp(boolean really) {
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| }
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|
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| class ReadThread extends Thread {
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| public void run() {
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| try {
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| HttpConnection httpConnection = (HttpConnection) Connector.open(rssFeedURL);
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|
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| KXmlParser parser = new KXmlParser();
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| System.out.println("Grabbing XML and parsing");
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| parser.setInput(new InputStreamReader(httpConnection.openInputStream()));
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|
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| System.out.println("looking for first tag");
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| /** <?xml...*/
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| parser.nextTag();
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| //ignore other tags, wait for <item> tag
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| parser.require(parser.START_TAG, null, null);
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| while(!"item".equals(parser.getName()) ){
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| /** Check if document doesn't include any item tags */
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| if( parser.next() == parser.END_DOCUMENT )
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| throw new IOException("No items in RSS feed!");
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| }
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|
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| /** Parse <item> tags */
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| do {
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| readItem(parser);
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| } while("item".equals(parser.getName()));
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| } catch (Exception e) {
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| e.printStackTrace();
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| foundItems.addElement(e.toString());
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| itemList.append("Error", null);
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| }
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| }
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| // Read a story and append it to the list
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| void readItem(KXmlParser parser)
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| throws IOException, XmlPullParserException {
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| parser.require(parser.START_TAG, null, null);
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| String title = null;
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| String description = null;
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| // Handles one <item> tag at a time
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| while (parser.nextTag() != parser.END_TAG) {
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| parser.require(parser.START_TAG, null, null);
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| String name = parser.getName();
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| String text = parser.nextText();
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|
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| //replace HTML entities
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| text = replace(text, "ä", "‰");
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| text = replace(text, "ö", "ˆ");
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| text = replace(text, "√§", "‰");
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| text = replace(text, "√∂", "ˆ");
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|
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| // Save item property values
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| if (name.equals("title")) {
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| title = text;
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| }
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| else if (name.equals("description")) {
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| description = text;
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| }
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| parser.require(parser.END_TAG, null, name);
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| }
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|
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| // Debugging information
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| System.out.println ("Title: " + title);
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| System.out.println ("Description: " + description);
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| if (title != null) {
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| foundItems.addElement(""+description);
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| itemList.append(title, null);
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| }
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|
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| parser.nextTag();
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| }
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| }
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| /* Replace all instances of a String in a String.
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| * @param s String to alter.
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| * @param f String to look for.
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| * @param r String to replace it with, or null to just remove it.
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| */
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| public static String replace( String s, String f, String r )
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| {
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| if (s == null) return s;
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| if (f == null) return s;
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| if (r == null) r = "";
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| int index01 = s.indexOf( f );
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| while (index01 != -1)
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| {
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| s = s.substring(0,index01) + r + s.substring(index01+f.length());
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| index01 += r.length();
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| index01 = s.indexOf( f, index01 );
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| }
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| return s;
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| }
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|
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| }
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| </pre>
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