Tablets E Readers

Advanced BlackBerry Development by Chris King

By Chris King

BlackBerry units and purposes are promoting via the hundreds of thousands. As a BlackBerry developer, you wish a sophisticated ability set to effectively take advantage of the main compelling beneficial properties of the platform. This ebook might help you enhance that ability set and educate you ways to create the main subtle BlackBerry courses attainable. With complex BlackBerry improvement, you will study you ways to use BlackBerry media functions, together with the digicam and video playback. The booklet additionally exhibits you ways to ship and obtain textual content and multimedia messages, use strong cryptography libraries, and fasten with the user's own and enterprise contacts and calendar.

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List() returns all the files and subdirectories in this directory. „ fileSize() reports how many bytes a file occupies on the filesystem. Note: Always include the trailing / character when specifying a directory path, such as file:///SDCard/BlackBerry/Music/. If you don’t, the BlackBerry operating system cannot determine whether you are referring to a file or to a directory of that name. The following code snippet checks to see whether a file exists. If it doesn’t, it will create it. The create() method does not automatically create directories, so this code first checks to see that the containing directory exists.

Figure 1-10. Requesting a signature Caution: Whenever you sign an application, you must request a signature from the RIM signing servers. These servers are notorious for their occasional outages of varying lengths that can strike at any time. If you have a deadline for your project, do yourself a favor and plan to finish ahead of time so you aren’t stuck if the signing servers happen to be offline right before you need to ship. Now, replace the old version of your app with the updated signed version.

Note: BlackBerry does not support many standard Java I/O classes such as BufferedInputStream. Although you have successfully obtained a FileConnection object, opening the stream may still fail. Security is generally not checked until you attempt to access the file. It is also possible that the file itself does not exist yet, or another app has a lock on it. Be prepared to handle SecurityException, IllegalModeException, and IOException. Once you have an appropriate stream, you can read or write to it as you would in a standard Java application.

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