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J2ME BREW Game Design

What is BREW?. Binary Runtime Environment for Wireless. Tied to CDMA (in practice, if not theory)Strongly supported by Verizon, Alltel Korean carriers, KDDI in Japan, Bell Mobility in Canada. Like Java, runs in a virtual machine (on the hardware). Qualcomm is the Gatekeeper. Write apps in C, C ,

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J2ME BREW Game Design

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    1. J2ME & BREW Game Design Code running on the handset (at last)

    2. What is BREW? Binary Runtime Environment for Wireless

    3. What is J2ME? Java 2 Micro Edition (for small device CLDC: Connected Limited Device Configuration MIDP: Mobile Information Device Profile

    4. Which Should You Use? Little difference in technical capability

    5. Why Develop J2ME/BREW Games? Run apps on the handset (not all logic has to be on the server side)

    6. How it Used to Work Download applet to your PC over the Internet. Hotsynch your phone to install applet. Can’t install applications over the air network. In Asia, applets can’t communicate over the network—soloplay only.

    7. How it Now Works User makes a network connection, browses carrier’s list of midlets, chooses one. HTTP request goes out over air network, is routed to remote server on the Internet. Server sends midlet to handset, where it is installed. Network sockets are exposed to J2ME on the handset, so midlets can send and receive data with remote servers.

    8. Technical Limitations Midlets must be <50k (or so)

    9. What We Can Rely On High-Level UI Features: PNGs & bitmaps Text Entry Select lists (radio buttons) & Multiple select lists (check boxes) Bar graphs Support for standard phone keys (0-9, *, #, arrows) Abstracted game controls

    10. Latency > WAP? With WAP, latency = air network + Internet latency

    11. Keep Network Access Sessions Short People pay by the minute— but YOU get nada

    12. Network Still Unreliable Irrelevant for soloplay

    13. Dealing with the 50k Limit Keep text short

    14. Making the Most of Graphics No inherent support for layers

    15. Thinking About UI Handset is similar to a console controller

    16. What Kinds of Games Can We Do? Primitive skill-and-action games (retro arcade)

    17. Jamdat Bowling

    18. Diamond Mine

    19. Micro Nitro

    20. Froggy

    21. URLs Obfuscators: www.alphaworks.ibm.com/tech/JAX/ retrologic.com J2ME Wireless Toolkit: java.sun.com/products/j2mewtoolkit/ Useful Articles: wireless.java.sun.com/midp/articles/ www.gamasutra.com/resource_guide/20010917/fox_01.htm

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