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n the first chapter of this book, you learned about the various decisions and components that are involved in developing an application Figuring out the requirements of your application is a critical and necessary step in the development of any application Without this analysis, you will probably find that your application will be over budget, be difficult to maintain, and, worse yet, may not even satisfactorily meet the requirements of your users Once you have figured out these requirements, it is time to figure out how you re going to go about fulfilling them This is where you get to exercise your creative thinking by keeping it as simple and to the point as possible while still keeping it extensible Always keep in mind that all that matters to the client is whether you ve met their expectations.

Here s how to do it If you look at Listing 10-8, you ll see that in addition to querying for key states (as in the corresponding class in 5), the keyPressed() method is also implemented This is because the return value of the getKeyStates() method only returns information about the standard Java key constants However, the AMS calls the keyPressed() method with the platform s raw keycode integer corresponding to the key that was pressed Since these keycodes vary from one device to the next, you usually follow with the getGameAction class to translate the platform-specific keycode into a recognizable Java constant (as explained in the section Using the Graphics and Canvas Classes from 2) But if you happen to know the current device s codes for the left and right softkeys, this is where you use that information.

CHAPTER 8 JOHNNXT IS ALIVE!

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When it comes to figuring out the architecture and design of your application, you will have to decide whether to build the components yourself or utilize a general framework Building it yourself will give you the freedom to create the architecture that best fits the application you are creating The downside to this is that it can be time-consuming, and if you don t put enough thought into the process, you might find yourself with an architecture that is less than desirable Utilizing a general framework can mean two things: either using an open source architecture or purchasing one Given the number of open source architectures that are available these days, it s difficult to justify purchasing an architecture One of the reasons for this is that most commercial frameworks do everything under the sun, and accordingly, they can be difficult to incorporate into different business environments.

Figuring out what keycodes your game should be using at any given moment is a two-step process: (1) identify the platform, and (2) load and use the correct keycode values for the current platform Identifying the platform is a challenge all its own, discussed in the Identifying the Platform sidebar earlier Then figuring out the keycodes for all of your target devices is a separate challenge Some manufacturers (Sony Ericsson, for example) publish developer guides that contain the keycodes Additionally, there are online databases listing the keycodes for many popular devices, such as the device database on the J2ME Polish web site (see the Using J2ME Polish sidebar) Many devices follow the WTK s example for their keycode mapping: -6 for the left softkey and -7 for the right softkey (These are the values used by Sony Ericsson, for example) But many don t.

The biggest reason commercial frameworks can be difficult in a specific business environment is that they often require an organization to adjust its software to work the way the framework wants the software to work This is especially true for commercial frameworks where the source code is closely guarded When evaluating a commercial framework or any framework that does not offer its source code to the public, it is important to not only evaluate whether the framework can meet the current needs but also to evaluate whether it will meet the needs of the future Not having the framework s source code introduces another risk.

The torso motor subassembly shows you how to get a liftarm to rotate with a huge torque, to raise heavy loads, such as JohnNXT s body Here symmetry is important, because loading an axle (or a gear) on just one side would twist it and you could run the risk of breaking it In this assembly, notice that the geartrain is repeated on both sides of the motor Also, to avoid ungearings, all the axle-bearing gears that are subject to high torque are kept together by beams The torso subassembly shows you how to use a servomotor as an integral part of a robot Here, the motor shaft not only drives the arms mechanism, but also is the pivot for the whole shoulders frame.

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