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If your app requires certain hardware capabilities to function, you should start communicating this fact well before the user downloads the app. It s frustrating to find that something doesn t work, and even worse if someone has paid for it. You might consider releasing different versions of your app for different devices, based on whether or not they support particular features. For example, you might make a version of MediaGrabber that omits camera support for devices like the 8800 that do not include a camera. This would slightly decrease the size of the app, and could prevent confusion if you clearly state that the app does not support taking pictures. To some extent, though, MediaGrabber already does a good job of examining device capabilities by checking the presence of recording options when building its options menu. Many developers will prefer to go this route. In such cases, the best strategy is usually to check for supported device statistics when the app first starts. Depending on what you find, you can enable or disable particular app features, and also display messages to users if you want to advise them of what they may be missing out on.

Possibly the most important difference between BlackBerry devices, the screen resolution will determine what art assets are available for use, what size of sprites to create, how much text you can fit on a screen without wrapping, and so on. You can generally reuse an application s design between two different BlackBerry devices that share the same screen resolution. If the resolutions are different, you should decide whether a redesign is necessary. The BlackBerry CLDC UI components generally adjust well to multiple screen sizes so long as you stick to simple organizations like the VerticalFieldManager. However, elaborate user interfaces that look great on one screen size may be illegible on another. In addition, touch-screen devices can be rotated into either portrait or landscape mode. Here too, so long as you stick to common UI designs, your app will probably function well in both orientations. Otherwise, you have a few options. Lock the screen into a particular orientation. You can do this by calling Ui.getUiEngineInstance().setAcceptableDirections(), passing in one of the direction orientations from the net.rim.device.api.system. Display class, such as Display.DIRECTION_LANDSCAPE or Display.DIRECTION_PORTRAIT. Detect the device orientation by calling Display.getOrientation(). This will return one of the enumerated direction values listed above. Then, display an appropriate UI for that orientation. You might need to switch to another UI if the user rotates while on the same screen. Some common BlackBerry devices and their screen resolutions are shown in Table 10-2.

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Hardware capabilities are locked in stone. If your device doesn t have a camera, it won t ever have a camera. The OS, though, is much more fluid, and can evolve over time. Because your software runs on top of the OS, you must carefully note the OS availability and features as you port to different phones.

BlackBerry can be the gift that keeps on giving. RIM has traditionally released updated versions for every BlackBerry device. Sometimes these are patches that fix bugs and improve performances; other times, they add significant new features. Updates are released by RIM, but will be approved by the wireless carrier or enterprise prior to being made available to end-users. Updates from wireless carriers are optional, and can either be installed through the BlackBerry Desktop Manager or over the air. Enterprises have the option of pushing out forced updates to newer software versions. BlackBerry has a far higher proportion of power users than most phones, and it is not uncommon for people to seek out and install unapproved device updates in hopes of getting better features or performance. The BlackBerry toolset allows a user to later downgrade to a previous software version, so there is little risk in doing so.