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Nearly every MIDP device uses a system of softkeys to drive its built-in GUI. A softkey is a physical button on the device whose function changes depending on the context. The button corresponding to the softkey is generally placed right next to the screen so that the program can display the current label for it such as Exit, Options, or OK. A typical platform has two softkeys a right softkey and a left softkey at the base of the screen. When writing your own custom GUI, naturally you want to be able to implement the softkey functionality so that you can be sure that the softkey labels match the look of the rest of the graphical components. Unfortunately, the designers of MIDP decided that they didn t want to make it easy for you to do this. The philosophy seems to be that the softkeys are a platformspecific implementation detail that you don t need to know about, and if you start fiddling with them, you can mess up the platform s consistent user experience by perhaps putting your Exit key on the left when the platform normally puts it on the right, or you might assume the softkeys are at the bottom of the screen when for a particular platform they re at the top. So MIDP encapsulates softkeys (and possibly other related input features) in Command objects and says in essence We ll handle them you don t touch them.

ClickOnce allows the deployment of applications over the Web. A user can click an application in the Start menu or use a link, and ClickOnce will determine based on a manifest whether the application should be updated. Although ClickOnce can handle some application deployment scenarios, it has some limitations. These limitations include the inability to modify registry settings, create custom installation directories, and share installations. Another solution could be the use of a simple MSI installation package that a user can run themselves; however, even this scenario can have problems. Some of these problems can include the lack of rights, the user not performing the necessary updates, and installation problems such as prerequisite components not being present on the user s machine. Another possible solution is to create a custom bootstrapper application for downloading updates to a desktop. In many cases, you can buy third-party packages to do this, or you can find open source implementations on the Internet. Although this approach removes the need to push installation packages each time an application requires an update, an initial installation will still have to take place to get the bootstrapper on the user s desktop.

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1,042 parts total (more than two NXT retail set parts are needed)

Summary

However, since so many devices use this same consistent design of placing the softkeys at the bottom left and bottom right of the screen, it s natural to want to try to implement them yourself to create a consistent, attractive look for your game It would have been nice if the designers of MIDP had at least thrown in some minimal support such as a system property you can query to determine whether the platform uses standard (bottom left and bottom right) softkeys, and then provide the corresponding key constants in the GameCanvas class As it is, it s possible to receive and interpret the softkey events, but you have to do some additional work, and the resulting code isn t terribly portable Essentially you have to customize the JAR file for every target device (or at least every manufacturer) that you d like to use custom softkeys on.

In summary, this chapter has gone over the key components most applications will need in order to create successful, reliable, and scalable applications. Remember to break apart the components of an application in at least a logical manner. Having one class file that handles all the application functionality can become a nightmare to maintain; plus, having the components logically separated will allow for future growth by allowing for the physical separation of layers into components to facilitate scalability. Now that you understand these components, the next task is to figure out how to implement these different layers and to understand how the Enterprise Library Application Blocks can fulfill these necessary features in an application.

You can obtain LEGO spare parts from LEGO Education (http://www.legoeducation.com/ global.aspx), BrickLink (http://www.bricklink.com/), and LEGO Factory Pick a Brick (http:// us.factory.lego.com/), even though the TECHNIC section is not well furnished at the moment. Also, a good place to find LEGO spares remains eBay (http://www.ebay.com). For those who live in Italy, a good resource is CampuStore (http://www.campustore.it/lego). This time, the building phase is more challenging than for the other robots in this book, but once finished, it will give you great satisfaction. Every JohnNXT subassembly will reveal many interesting mechanical aspects for you, and each one will teach you something.

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