Yahoo! One Day Java ME Crash Course 8 Feb 2007

2007-02-08T11:58:51Z

67.101.148.212: /* Introduction */

== Menu ==

=== Introduction ===
* [http://uberthings.com/teaching/wiki/index.php?title=Setup Setup] / Installation
* Useful [[Links]]
* Your first program
** [[Hello (Form version)]]
** [[Hello (Canvas version)]]
* [[Deploying]] - getting your apps running on real devices

=== User Interfaces ===
==== Forms ====
* [[Forms-A-Go-Go]] - a smorgasbord of form examples
* [[ZombieDetector]] - a teeny bit of logic and forms
==== Canvases ====
* [[CanvasDemo]] - a braindead animation on a canvas
* [[TastingCanvas]] - an assortment of tasty Canvas treats

=== Events ===
* [[Name That Key]] - trapping key events

=== Multimedia (MMAPI) ===
* [[MediaInformationMidlet]] - figure out which mime types your device speaks

==== Camera ====
* [[CameraMidlet]] - displaying and capturing images

=== HTTP ===
* [[ImageMonkey]] - Downloading images using HTTP

=== Games ===
* [[GameTest]]

=== XML/RSS parsing ===
* [[RSS Demon]]

=== GPS on iDEN ===
* [[Position Demo]]

=== Bluetooth ===
* [[Bluetooth]]

RSS Demon

2007-02-08T11:08:03Z

67.101.148.212:

* 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

<pre>
/**
* RSS Demon
* a modified version of my XMLDemon example uses kXML2 to parse RSS feeds
*
* NOTE: Uses techniques and code from Tommi Laukkanen's RSS Reader - http://www.substanceofcode.com
* copyleft Michael Sharon 2006
*/

package my;

import java.io.*;
import java.util.Vector;

import org.kxml2.io.*;
import org.xmlpull.v1.*;

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.io.*;

public class RSSDemon extends MIDlet implements CommandListener {

//add any RSS feed here

//NY Times Music Feed
static final String rssFeedURL = "http://www.nytimes.com/services/xml/rss/nyt/Music.xml";

//BBC News Feed
//static final String rssFeedURL = "http://newsrss.bbc.co.uk/rss/newsonline_world_edition/front_page/rss.xml";

//An empty feed which will cause an error
//static final String rssFeedURL = "http://uberthings.com/teaching/mobile_application_design/7/empty.xml";

//BBC
//The title of your RSS feed
static final String TITLE = "NY Times Music";

//Vector stores a variable number of items from the feed
Vector foundItems = new Vector();

//Holds all our items
List itemList = new List(TITLE, Choice.IMPLICIT);

TextBox textBox = new TextBox("", "", 256, TextField.ANY);

Display display;

Command backCmd = new Command("Back", Command.BACK, 0);

public void startApp() {

//get a reference to the display object
display = Display.getDisplay(this);

//set up listeners and commands
itemList.setCommandListener(this);
textBox.setCommandListener(this);
textBox.addCommand(backCmd);

//show the list of items
display.setCurrent(itemList);

//create a new thread and start it
new ReadThread().start();
}

public void pauseApp() {
}

public void commandAction(Command c, Displayable d) {

if (c == List.SELECT_COMMAND) {

//retrieve the specific item that we have selected
String text = (String) foundItems.elementAt(itemList.getSelectedIndex());

if (textBox.getMaxSize() < text.length())
textBox.setMaxSize(text.length());

textBox.setString(text);
display.setCurrent(textBox);
} else if (c == backCmd)
display.setCurrent(itemList);
}

public void destroyApp(boolean really) {
}

class ReadThread extends Thread {

public void run() {
try {
HttpConnection httpConnection = (HttpConnection) Connector.open(rssFeedURL);

KXmlParser parser = new KXmlParser();

System.out.println("Grabbing XML and parsing");
parser.setInput(new InputStreamReader(httpConnection.openInputStream()));

System.out.println("looking for first tag");

/** <?xml...*/
parser.nextTag();

//ignore other tags, wait for <item> tag
parser.require(parser.START_TAG, null, null);
while(!"item".equals(parser.getName()) ){
/** Check if document doesn't include any item tags */
if( parser.next() == parser.END_DOCUMENT )
throw new IOException("No items in RSS feed!");
}

/** Parse <item> tags */
do {
readItem(parser);
} while("item".equals(parser.getName()));

} catch (Exception e) {
e.printStackTrace();
foundItems.addElement(e.toString());
itemList.append("Error", null);
}
}

// Read a story and append it to the list
void readItem(KXmlParser parser)
throws IOException, XmlPullParserException {

parser.require(parser.START_TAG, null, null);

String title = null;
String description = null;

// Handles one <item> tag at a time
while (parser.nextTag() != parser.END_TAG) {
parser.require(parser.START_TAG, null, null);
String name = parser.getName();
String text = parser.nextText();

//replace HTML entities
text = replace(text, "ä", "‰");
text = replace(text, "ö", "ˆ");
text = replace(text, "√§", "‰");
text = replace(text, "√∂", "ˆ");

// Save item property values
if (name.equals("title")) {
title = text;
}
else if (name.equals("description")) {
description = text;
}

parser.require(parser.END_TAG, null, name);
}

// Debugging information
System.out.println ("Title: " + title);
System.out.println ("Description: " + description);

if (title != null) {
foundItems.addElement(""+description);
itemList.append(title, null);
}

parser.nextTag();
}
}

/* Replace all instances of a String in a String.
* @param s String to alter.
* @param f String to look for.
* @param r String to replace it with, or null to just remove it.
*/
public static String replace( String s, String f, String r )
{
if (s == null) return s;
if (f == null) return s;
if (r == null) r = "";

int index01 = s.indexOf( f );
while (index01 != -1)
{
s = s.substring(0,index01) + r + s.substring(index01+f.length());
index01 += r.length();
index01 = s.indexOf( f, index01 );
}
return s;
}

}
</pre>

Mobile Application Design - User contributions [en]

Yahoo! One Day Java ME Crash Course 8 Feb 2007

RSS Demon