Game Programming Game Programming by by

J2MEJ2ME

By Hamada Zahera

hamada.zahera@mufix.org

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OutlineOutline

•• Java is Everywhere !!Java is Everywhere !!•• Introduction to J2ME: Introduction to J2ME: features & Applicationfeatures & Application•• Your First J2ME Application (Demo#1)Your First J2ME Application (Demo#1)•• Game Design & ArchitectureGame Design & Architecture•• Design your first game (Demo#2)Design your first game (Demo#2)•• Deploying your applicationDeploying your application

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Java Is Everywhere !Java Is Everywhere !• The Power of Java : it can be used not only for

PC but also many different electronic devices as

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Java Editions !!Java Editions !!• J2SE (Java 2 standard edition) is for developing

desktop applications, GUI and Database Application (see J2SE API)

• J2EE (Java 2 enterprise edition ) for Client serve applications , for example web sites.

• J2ME (Java 2 micro edition) for applications which run on resource constrained devices (small scale devices) like cell phones, for example games.

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J2ME: (Java 2 Micro Edition)J2ME: (Java 2 Micro Edition)•• J2MEJ2ME is a java platform which is customized for developing

applications for embedded devices like Mobile , IPhones , PDAs ,….., etc.

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J2ME ArchitectureJ2ME Architecture• Basically , J2ME Applications run on a platform which

is already support by almost of Mobile phones • By default , there are build-in Packages which support

common functionality like GUI , I/O ,Bluetooth, Game API ,etc . These package called “MIDP”

• Mobile phones are different in hardware configurations and resources like memory and feature

• We have two configuration layer of Embedded Devices : Device with higher resources : set-top Boxes use CDC andDevice with limited resources use CDLC

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MIDPMIDP- Mobile Information Device Profile (MIDP) is a key

element of J2ME.- When combined with the Connected Limited

Device Configuration (CLDC), MIDP provides a standard Java runtime environment for today's most popular mobile information devices, such as cell phones and PDAs

- We have MIDP 1.0 , MIDP 2.0

Runtime Environment = MIDP+CDLCRuntime Environment = MIDP+CDLC

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CDCL CDCL vsvs CDCCDCJ2ME Connected, Limited Device Configuration (CLDC)J2ME Connected, Limited Device Configuration (CLDC)- specifies the Java environment for mobile phone, pager and wireless devices - CLDC devices are usually wireless - 160 - 512k of memory available for Java - typically has limited power or battery operated- network connectivity, often wireless, intermittent, low-bandwidth (9600bps or

less)

J2ME Connected Device Configuration (CDC)J2ME Connected Device Configuration (CDC)- describes the Java environment for digital television set-top boxes, high end

wireless devices and automotive telematics systems. - device is powered by a 32-bit processor - 2MB or more of total memory available for Java - network connectivity, often wireless, intermittent, low-bandwidth (9600bps or

less)

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J2ME FeaturesJ2ME FeaturesDescriptionNameJSR

File system, contacts, calendar, to-do

File Connection and PIM

75

Wireless connectionsBluetooth82

Audio, video, multimedia

Mobile Media API(MMAPI)

135

High level 3D graphics Mobile 3D Graphics

184

GPS Location API179

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Demo#1 :Your First applicationDemo#1 :Your First application• Prerequisites :

- JDK 1.5- Install NetBeans with mobility Pack

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Game DesignGame Design

You have to concern with the following :– Logic – Characters– Graphics– Sounds

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Game ElementsGame Elements• 1.Sprite : game object like car , ball ,

persons which has some attributes like X,y coordinates and weight , width

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Game Elements .. (cont)Game Elements .. (cont)• 2.Tiled Layers: dividing the game background

into small cells to save memory and allow other spaces for game objects

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e.g. Tiling Game Background e.g. Tiling Game Background

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Game Elements .. (cont)Game Elements .. (cont)• 3. Layer Manager : it’s a container layer

which group all game object together , game background so we can manage a series of layers simplifying the rendering process

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Demo#2 : Game appDemo#2 : Game app

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ResourcesResources• Books

• Links:www.j2meforums.comwww.j2meforums.com

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Thank you Thank you