Game Development for Nokia Asha Devices with Java ME #1
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The document outlines the development of mobile games for Nokia Asha devices using Java ME, highlighting the significance of Nokia's app store and the platform's architecture. It discusses Java ME configurations, profiles, and key components like MIDP and CLDC, detailing the lifecycle and management of MIDlets. Furthermore, the document provides insights into IDE integration and the development process for creating Java applications tailored for resource-limited devices.
Game Development for Nokia Asha Devices with Java ME #1
- 1. Game Development for Nokia Asha Devices with Java ME Marlon Luz - INdT Nokia Developer Evangelist @marlonluz
- 2. WHAT IS THE CENTER OF INdT? RESEARCH & DEVELOPMENT nonprofit with focus in development of new concepts, products & solutions for areas related to mobile tecnologies and internet
- 3. Training Content • Talk on games • Nokia App Store • Nokia Platforms • Introduction to Java ME Development • Game API • Publishing your game
- 4. Mobile Games • Player Experience • Idea • Design • Audio • Coding
- 6. Nokia App Store, Series40 & JavaME 120k+ apps, 15m downloads/day Brasil: 150m downloads (total), 50m in 2012, 500k per day, 56% in Series 40, 73% of purchases are JavaME apps
- 7. Nokia Platforms Java apps Phones Series 40 Silverlight, XNA
- 11. Nokia SDK 2.0 for Java • Emulates the device environment • Location, contactos, etc. • Emulates mobile events like battery, sms, etc. • IDE Integration
- 12. Development • IDE Installation • Overview JavaME • First Project
- 13. JavaME Overview • Java Micro Edition (ME) is the Java for devices with limited resources • Java ME brings a common platform for devices like: • Mobile phones • Pagers • PDAs • Set-top boxes • Java ME defines a set of configurations, profiles e optional APIs; • Java ME enables the developers to create applications for a large number of devices;
- 14. Configurations • Support a wide variety of products that fit within the scope of J2ME; • Defines a Java platform for a wide variety of devices, also defines a JVM (Java Virtual Machine) and the minimum set of class libraries available: • Connected Device Configuration (CDC) • Connected Limited Device Configuration (CLDC)
- 15. CLDC • 128 kilobytes of memory to run Java; • 32 kilobytes for memory allocation in runtime; • No user interface; • Low power processing, battery enabled device; • 16-32 Mhz Processor
- 16. Profiles • Needed APIs to develop applications for a specific set of devices • MIDP • IMP • PBP • ...
- 17. MIDP • Mobile Information Device Profile; • MIDP defines the following set of classes: • Application Lifecycle Package • User Interface Package Mobile Information • Persistence Package Device Profile Networking Persistent Interface Storage • Networking Package MIDlet User APIs • Language and Utility Packages CLDC Core classes CLDC or KVM
- 18. MIDP • 3 versions available: MIDP 1.0 MIDP 2.0 Memory Requirement At least 200KB At least 256KB High/Low-Level UI Network API Persistent Storage API Game API Secure networking Push Registry Signed MIDlets
- 19. MIDlets • Apps Java that run on MIDP devices are known as MIDlets • MIDlets are defined in the javax.microedition.midlet package • Child of the abstract class javax.microedition.midlet.MIDlet • Life cycle defined and managed by methods implemented in the MIDlet;
- 20. MIDlets • An application manager controls the MIDlet running • The MIDlet behavior is controlled by a life cycle through methods that a MIDlet has to implement default constructor() startApp() Paused Active pauseApp() destroyApp() destroyApp() Destroyed
- 21. MIDlets • The platform can change the state from Active to Paused at any time startApp() Paused Active pauseApp() destroyApp() destroyApp() Destroyed
- 22. MIDlets • The method destroyApp() of a MIDlet is called when the platform needs shutdown a MIDlet startApp() Paused Active pauseApp() destroyApp() destroyApp() Destroyed
- 23. MIDlets • Let´s see how to implement a MIDlet #stopTalking #startCoding
- 24. JAD and JAR • JAD (Java Application Descriptor) • Provides information on the content of a JAR file • JAR (Java Archive) • Packaging various kinds of information (classes, images, audio, data) • Attributes JAR/JAD
- 25. Development process Development Station MyMIDlet.jad MyMIDlet.java Download /deploy javac Target Devices Download MyMIDlet.class /deploy MyMIDlet.jar preverify MyMIDlet.class jar
- 26. Thanks Marlon Luz [email protected] @marlonluz