1. Writing Your First MIDlet Running JAVA on a Cell Phone Jon A. Batcheller January 27, 2004

2. Overview The MID The CLDC & MIDP API Developing Code Emulation Deployment

3. MID – Mobile Information Device Cell Phones, Palms, Blackberry…. Pocket Fisherman? JAVA = one program, multi-platforms “similar platforms” - WORA

4. MIDP Reduced JVM J2ME – Java 2 Mobile Edition CLDC – Connected Limited Device Configuration CDC – Connected Device Configuration – full JVM imp. MIDP – Mobile Information Device Profile Personal Java, Embedded Java, JavaPhone

5. MIDP MID MID Native (SYMBIAN OS) CLDC MIDP Native Apps JAVA MIDP Apps

6. CLDC 128K to 512K total memory Limited Power Limited Connectivity (9600bps) Reduced UI Cell Phones, Pagers, PDA’s

7. MIDP API and virtual machine to device domain java.lang java.util java.io javax.microedition.io javax.microedition.lcdui javax.microedition.rms javax.microedition.midlet

8. Development Tools Sun Micro – J2ME Wireless Toolkit MIDP 1.0.3 Borland & Sun Forte Nokia – Standalone & JBuilder attachment Need environment to compile (library), verify, package, emulate, and finally deploy

9. Writing our first MIDlet Application written for the MIDP Profile Must derive from javax.microedition.midlet.MIDlet Must implement startApp(), pauseApp() and destroyApp() Typically also implement a default constructor and a commandAction() from the CommandListener interface

10. MIDlet Lifecycle

11. HelloMIDlet.java Extends MIDlet Implements startApp, pauseApp, destroyApp Like an Applet, need something and somewhere to display Display.vs. Displayable Foreground.vs. Background Current Displayable

12. HelloMIDlet.java Extends MIDlet Implements startApp, pauseApp, destroyApp Like an Applet, need something and somewhere to display Display.vs. Displayable Foreground.vs. Background Current Displayable

13. Display Object Displayable current = Display.getDisplay(this).getCurrent(); Returns current Displayable Typically in startApp(), look for current Displayable, if null, create own and set it as current.

14. HelloScreen Displayable current = Display.getDisplay(this).getCurrent(); Returns current Displayable Typically in startApp(), look for current Displayable, if null, create own and set it as current.

15. HelloMIDlet.java Compile Note project library Package Emulate Deploy Test

16. Package JAD Versions – JAD, CLDC, MIDP Multiple MIDlets – Suites Other Classes Other Files JAR

17. JAD – Java Application Descriptor Usually a link on a WAP site Info on the MIDlet Most Important – URL of the JAR Downloaded to MID then user queried to download JAR

18. JAD – Java Application Descriptor MIDlet-Name: HelloWorld MIDlet-Version: 0.0.1 MIDlet-Vendor: Solidware, Inc MicroEdition-Profile: MIDP-1.0 MicroEdition-Configuration: CLDC-1.0 MIDlet-Jar-URL: HelloWorld.jar MIDlet-Jar-Size: 1592 MIDlet-1: HelloWorldApp,, HelloWorldApp

19. Deploy JAD first JAR on request Methods –IR –BlueTooth –Email –WEB – “Over the Air” http://www.javac.com/index.wml

20. Emulate Emulators – part of toolkits – Sun or Phone http://developers.sun.com/techtopics/mobility/midp/ articles/emulators Debugging Environment Interesting Behaviors

21. Test –Download jad –Queries user if new or different version –Download jar –Execute Application Review Application details

22. PropExample.java Review Code Emulators Test

23. javax.microedition.lcdui MIDP Low & High-level APIs Displayable CanvasScreen AlertFormListTextBox

24. javax.microedition.lcdui Contents of Form and Alert Screens Item ChoiceGroupDateFieldGaugeImageItemStringItemTextField

25. UiDemo.java Look and Feel Bejeweled

26. javax.microedition.io CLDC – HTTP protocol! Connection object Content, Datagram, HTTP, Stream Normal Stream I/O –Open with URL –Get input/output streams –Read/Write –Close

27. javax.microedition.io HttpExample.java Log & Server2.java

28. javax.microedition.rms Named record store Access to byte array records Add, Get, Store Stock Ticker

29. Writing Your First MIDlet Running JAVA on a Cell Phone And the discussion continues at McMenamin’s Greenway Pub, 12272 SW Scholls Ferry Road North on 217 next exit, then West