Download Advanced BlackBerry Development by Chris King PDF

By Chris King

BlackBerry units and functions are promoting by way of the hundreds of thousands. As a BlackBerry developer, you would like a complicated ability set to effectively take advantage of the main compelling gains of the platform. This ebook can help you enhance that ability set and educate you ways to create the main subtle BlackBerry courses attainable. With complex BlackBerry improvement, you are going to research you the way to exploit BlackBerry media features, together with the digicam and video playback. The booklet additionally indicates 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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To launch in video record mode, use the appropriate parameter in CameraArguments. ARG_VIDEO_RECORDER)); At this point, your application is backgrounded, and you will not be able to interact with the user. However, your application can monitor the filesystem for newly created files, and then use them as if they were created by your application. You’ll see an example of this later in the chapter. Creating a MediaPlayer As noted earlier, any media operation requires both a DataSource and a Player.

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. close(); Networking Almost every interesting mobile app includes some sort of networking. It might share messages with other users, back up data on a remote server, or download new game levels.

UiApplication. Listing 1-2 shows a simple CLDC app that performs the same basic function as the previous MIDlet application. For this example we will be configuring a basic MainScreen with some non-interactive elements. Future examples in this book will show how to create more interactive CLDC applications. Listing 1-2. start(); } } You’ll note that this is even less code than was used in the MIDlet. When you build a CLDC app, you get a lot of useful capabilities for free, including automatic state management that allows a user to navigate back through your app and exit.

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