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CHAPTER 8: Digging in Deep
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When two applications share responsibilities and features, the result is more than the sum of its parts. Imagine a world where you couldn t print images you found on the Internet, or where you couldn t attach files to your email. The more applications that can touch and share data with one another, the more useful and compelling they become. In this chapter, you have learned how to take advantage of multiplicative utility in your own apps. You can tap a wealth of features already designed by RIM when you use their hooks to add features to your app. And, in the other direction, you can make your app far more useful to your users if you create an API that allows other developers to use you. If five other apps all use your app, you have just become even more indispensable, without even needing to write those five new apps. This level of deep integration blurs the lines between a built-in app and an installed app. When your app is displaying as an option in the Contacts menu, and showing a custom rollover icon, and getting opened from other apps, it becomes almost indistinguishable from the apps that came pre-installed on the BlackBerry. You have now mastered the critical aspects of making powerful, useful, integrated apps. The next goal is to get those apps onto as many devices as possible, operating as smoothly as you can. Part 3 will show you how to make sure your apps can be used by as many people as possible.
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Part
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you should share it with as many people as you can. Whether you send it to a few friends for fun, or sell it to hordes of eager consumers, people will appreciate your effort and achievement.
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Don t be selfish. Now that you can write an interesting and powerful BlackBerry app,
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However, there can be a world of difference between writing an app that runs well on your personal phone and one that runs smoothly on everyone s phone. You don t want to deal with frustrated customers, confused managers, or sniping competitors. You especially don t want to take ten times as long making your app run on ten devices as you did on the first one. This final section of the book tackles the tricky problem of scaling up. Anticipate security problems before they arise, port your app to a variety of languages and devices, and make building multiple versions easier than before. These techniques won t just improve your work; they will also let you be more generous with the results.
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RIM Security
Few topics trip up BlackBerry developers more than the RIM security model. It can be extremely frustrating to take an app that works perfectly in the simulator and find that it won t even start on a handset; or, worse, one that passes all your internal testing, but exhibits strange behavior in the field. Such problems are often the result of occasionally arcane security rules. Some of them you can bend, some you can break, and others you must live with: in all cases, though, just understanding them will allow you to make better decisions. This chapter examines the most important features of BlackBerry device security and how they affect your applications.
The Ownership Question
Who owns your BlackBerry At first, that may seem like a foolish question: I do, of course. After all, you carry it with you, it s got your phone number, and it shows your name on it. However, actual possession is not quite as straightforward as it may seem at first. If you got your BlackBerry from an employer, then, despite the fact that you carry the device, they are the ones who really own it: they paid for it, they run the network it connects with, and they are responsible for the behavior of the devices. A business has an interest in the ongoing use of BlackBerry devices. They may not want you to upload 3 gigabytes of video files onto the corporate intranet, make phone calls to 1-900 numbers, or install virus-ridden software. When people do these things, they don t only affect their own devices, but they also create financial and administrative headaches for their employers. Even if you got your BlackBerry for a personal mobile phone account, the ownership question might not be quite as simple as you might think. If, like most Americans, you got your BlackBerry as part of a two-year contract, you might have only paid $100 or so instead of a list price of $700 or higher. Your mobile carrier will have subsidized the remaining cost to Research in Motion (RIM) to entice you as a customer. In return, you are expected to continue with them as a loyal customer for multiple years. What happens if you renege on your contract after a month and walk away with your new BlackBerry You could argue that, having violated the contract, the phone company is the one who really owns it: they paid for the majority of it, and set the terms under
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