Mobile Application Design - User contributions [en]

Java Setup Notes

2007-04-10T16:53:26Z

200.238.102.170:

== Setting up your environment ==

Having a good environment setup is essential for everything you will be doing with Java ME - writing, compiling, packaging, debugging, obfuscating, tearing your hair out etc etc. Use the instructions here to setup your environment on Windows or OS X (currently experimental).

<h2>Java Wireless Toolkit</h2>
#Java Standard Edition Development Kit (JDK) - you need to have some version of Java installed on your machine. Try to get version 1.4.2 (or later). This is essential for development. NOTE: You MUST have the JDK installed before you install the Java Wireless Toolkit as you will need the tools it contains (such as javac) to compile and run your MIDlets.
#Download it here: http://java.sun.com/j2se/downloads/index.html. Get the version without any other bundled software. It should be called something like JDK 5.0 Update 8.
#Java ME, Wireless Toolkit (WTK). This contains the essential tools that we need to build, package and install mobile applications. Download it here: http://java.sun.com/products/j2mewtoolkit/. Get the [J2ME Wireless Toolkit 2.2 http://java.sun.com/products/sjwtoolkit/download-2_2.html], or if you feel living on the bleeding edge - grab the Sun [Java Wireless Toolkit 2.5 for CLDC, Beta http://java.sun.com/products/sjwtoolkit/download-2_5.html](the toolkit formerly known as J2ME Wireless Toolkit). Careful, you may cut yourself.
#I'm going to assume that you will install this into the <pre>C:\WTK\</pre> directory - if you install it somewhere else, just modify the paths accordingly.

<h2>Paths</h2>
To play nicely with the grown-ups, Java needs to know where all your files are, so we need to add the location of the Java binaries to the system path.

<h3>Windows 95/98</h3>
Go to Start->Run. Type in <em>command</em>. Then type

<pre>SET PATH=%PATH%;C:\WTK\bin</pre>

You should also edit your C:\autoexec.bat file to include this line, so you don't have to enter it every single time you restart your computer. After you've done this, you should be able to run the tools included in the Java Wireless Toolkit from any directory on your system.

<h3>Windows 2000/XP</h3>
#Go to Control Panel -> System.
#Click on the Advanced Tab
#Click on the Environment Variables button
#Double-click the PATH variable in the System variables box
#At the end of the <em>Variable value</em> field, add the path to your J2ME WTK installation - for me this is something like <em>;C:\WTK</em>
#If you had to install the J2SE SDK too, it's a good idea to add the paths for that as well - for me this was <em>C:\j2sdk1.4.2_03;C:\j2sdk1.4.2_03\bin</em>.

<p>A good way to test if this worked is to type the preverify command without any arguments in the command line. You should see something like this on your screen. </p>
<pre>
C:\> preverify<br />
Usage: PREVERIFY.EXE [options] classnames|dirnames ...<br />
<br />
where options include:<br />
-classpath <directories separated by ';'><br />
Directories in which to look for classes<br />
-d <directory> Directory in which output is written <br />
@<filename> Read command line arguments from a text file.<br />
</pre>

<h2>Emulators</h2>

<h3>Windows</h3>
Depending on your target device, you should download and install the SDK for that particular handset or family of handsets from the manufacturer's site. Since this course is based around the Nokia Series 60 handsets, we're going to grab the Nokia Series 60 2nd Edition SDK, Feature Pack 2 and 3 as well as the Nokia Series 60 3rd Edition SDK (for the N80). You'll also need to get serial numbers for these SDKs, so don't forget to request those as well.
Download them from here:

[http://www.forum.nokia.com/info/sw.nokia.com/id/6e772b17-604b-4081-999c-31f1f0dc2dbb/S60_Platform_SDKs_for_Symbian_OS_for_Java.html Series 60 SDKs]

<h3>Mac OS X</h3>
None of the manufacturers have bothered to port their SDKs for the Mac, and neither has Sun, but there is a way to develop MIDP 1.0 and 2.0 applications using Apache Ant, MPowerplayer MIDP 2.0 SDK and J2ME Polish. Get 'em while they're hot:

<h5>Apache Ant</h5>
# Download Apache Ant from http://download.nextag.com/apache/ant/binaries/apache-ant-1.6.5-bin.tar.gz
# Save it somewhere easy and memorable - on my machine I save all my downloaded source files to <pre>/Users/michael/src</pre>
# Here is the process. To try keep things clean, we're going to be installing into /usr/local.
<pre>
tar -zxvf apache-ant-1.6.5-src.tar.gz
cd /usr/local
sudo mkdir ant
cd ant
sudo cp -R ~/src/apache-ant-1.6.5/bin .
sudo cp -R ~/src/apache-ant-1.6.5/lib .
</pre>
# Set up the paths in your environment
<pre>
pico ~/.bash_login
</pre>
Add these lines somewhere
<pre>
export ANT_HOME=/usr/local/ant
export JAVA_HOME=/Library/Java/Home
export PATH=${PATH}:${ANT_HOME}/bin
</pre>
Shut down your shell, open it up again and type
<pre>
ant

You should see something like this

Buildfile: build.xml does not exist!
Build failed
</pre>
This means that Ant is installed and we're ready to roll.

<h5>MPowerplayer MIDP 2.0 SDK</h5>
# Download this from http://www.mpowerplayer.com/products-sdk.php
# Save the file somewhere in your src folder and unzip it. On my machine this looked like this:
<pre>
/Users/michael/src/mobile/mpp-sdk
</pre>
# [Optional] I like making shortcuts so that it's easy for me to run the application. Fire up your favourite editor and type this
<pre>java -jar /Users/michael/src/mobile/mpp/player.jar $1

ZombieDetector

2007-04-10T15:13:59Z

200.238.102.170:

=== Overview ===

=== Setup ===

# Create a new J2ME Midlet Suite in Eclipse by right-clicking in the Package Manager, selecting New -> Project -> J2ME Midlet Suite
# Call this ZombieDetector. Leave everything else as is.
# Right-click on your ZombieDetector project and select New -> Class
# Use '''src''' as your package and '''ZombieDetector''' as the class name. Click Finish.
# Open your new ZombieDetector class
# Cut and paste the code from below into your file. Save.
# Open up the ZombieDetector.jad file
# Click on the Midlets tab. Click Add.
# Write in ZombieDetector as the MIDlet name.
# Click in the button that appears in class. You may have to start typing Zombie in. It should find your class automatically. If nothing happens, try closing all the files down and opening them again.
# Right-click your project again, select Run As, then Run...
# Setup so that it looks something like this - http://uberthings.com/teaching/mobile_application_design/2/run_dialog.png
# Run your MIDlet

<pre>
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

/**
* Zombie Detector
* @author Michael Sharon
*
* This program will allow a user to type in a sentence and detect if they are a zombie or not.
*
* Notice that we're implementing the CommandListener and Runnable. Read up on those two classes in the API docs.
* Runnable - http://uberthings.com/mobile/docs/midp1/java/lang/Runnable.html
* CommandListenter - http://uberthings.com/mobile/docs/midp1/javax/microedition/lcdui/CommandListener.html
*/
public class ZombieDetector extends MIDlet implements CommandListener, Runnable {

//Create our variables

//Every MIDlet will always contain exactly one Display object
//Display represents the device's display manager and input devices
private Display mDisplay;

private Command mExitCommand, mDetectCommand, mCancelCommand;

//Setting up the Textbox and Progress Forms (like the example in class)
private TextBox mSubmitBox;

private Form mProgressForm;

private StringItem mProgressString;

//Field / Form style
private TextField mSubmitField;

private Form mDetectionForm;

public ZombieDetector() {
mExitCommand = new Command("Exit", Command.EXIT, 0);
mDetectCommand = new Command("Detect", Command.SCREEN, 0);

mSubmitBox = new TextBox("ZombieDetector", "Am I a Zombie?", 32, 0);
mSubmitBox.addCommand(mExitCommand);
mSubmitBox.addCommand(mDetectCommand);
mSubmitBox.setCommandListener(this);

mSubmitField = new TextField(
"Type a few words below to check if you are a zombie:",
"I am not a zombie.. honest..", 32, 0);
mDetectionForm = new Form("Zombie Detector");
mDetectionForm.addCommand(mExitCommand);
mDetectionForm.addCommand(mDetectCommand);
mDetectionForm.append(mSubmitField);
mDetectionForm.setCommandListener(this);

mProgressForm = new Form("Lookup progress");
mProgressString = new StringItem(null, null);
mProgressForm.append(mProgressString);
}

public void startApp() {
mDisplay = Display.getDisplay(this);

//uncomment the mSubmitbox line below to run it like the example in class
//mDisplay.setCurrent(mSubmitBox);
mDisplay.setCurrent(mDetectionForm);

}

public void pauseApp() {
}

public void destroyApp(boolean unconditional) {
}

//This is called whenever we select a command
public void commandAction(Command c, Displayable s) {
if (c == mExitCommand) {
destroyApp(false);
notifyDestroyed();
} else if (c == mDetectCommand) {
// Show the progress form.
mDisplay.setCurrent(mProgressForm);
// Kick off the thread to do the query.
Thread t = new Thread(this);
t.start();
}
}

/*
* The run() method is automatically called when a new Thread is started.
*
*/
public void run() {

//uncomment the line below if you want use the TextBox
//String word = mSubmitBox.getString();
String word = mSubmitField.getString();
//System.out.println is useful for debugging and sending things to the console.
System.out.println("Got the String - " word);
String result;

result = checkForZombie(word);

//Place the result into an Alert
Alert results = new Alert("Result", result, null, null);
results.setTimeout(Alert.FOREVER);

//Display the Alert, followed by the next Displayable - in this case our Form or Textbox
//Uncomment the line below to use the Textbox
//mDisplay.setCurrent(results, mSubmitBox);
mDisplay.setCurrent(results, mDetectionForm);
}

private String checkForZombie(String word) {
String isZombie = null;
int zombieCheck = 0;

//Check if we're dealing with a zombie
zombieCheck = word.indexOf("brain");

if (zombieCheck == -1) {
isZombie = "This is a live one. No zombies here.";
} else {
isZombie = "Eeek! Run for your lives!";
}

return isZombie;
}
}</pre>

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2007-04-09T23:12:19Z

200.238.102.170:

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