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One of the most exciting opportunities modern mobile phones offer is the chance to deliver high-quality media experiences. Entire companies have been founded to provide personal television channel delivery, radio station rebroadcast, or similar repackaging of media. In many other applications, you can use media to enhance the features of your app. You might add background music to your game, a tutorial video to a productivity app, or a slideshow mode to a real estate app. You must rely on your own judgment to decide whether media is appropriate for your app, and, if it is, to select the appropriate content. Once the time comes to actually present the media, BlackBerry devices offer a set of APIs for locating and playing that content. As with media capture, you can choose between standard MMAPI interfaces that embed playback within your app, or RIM interfaces to use a native app.
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Because BlackBerry devices are feature-rich and live on the network, you have a plethora of choices for finding and delivering media files to play. This section discusses the various options and the tradeoffs each offers.
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You can use the FileConnection API to discover and load content. BlackBerry devices offer both internal memory and external SD card storage. The former is fast and reliable, but limited in size. It is fine for storing app data, but you will annoy your users if you fill it up with large media files. The SD card offers a large amount of storage, but there is no guarantee that the user will have a card inserted at any time.
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You should first use the FileSystemRegistry to ensure that the file system you want to use is available. You can then use the FileConnection API to look up content, recursing
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CHAPTER 3: Media Playback
into subdirectories if necessary. Alternately, if you know the absolute path of the media file you re looking for, you can directly test for its existence. Once you have verified that the media file is present, you can directly create a Player for it by passing the file s URL to Manager.createPlayer(). If you prefer, you can also open the file contents as an InputStream and pass that stream to Manager.createPlayer(). In the latter case, you should also provide the media s MIME type, such as "audio/mpeg". If you omit the MIME type, Manager will attempt to detect it based on the initial contents of the InputStream, which may or may not be possible.
When to Use
A local filesystem offers several advantages Speed. Your media can load and start playing more quickly than it could when loaded over the network, even on a fast location. Reliability. Particularly when using internal device memory, you can be relatively sure that the media will be available, assuming the user hasn t manually deleted it. There are also some drawbacks. Capacity. The device s internal memory store is limited, and the user may not want you to take up space on their SD card. Authority. Users may choose to grant or deny your app permission to read files at all, and you will be stuck if they deny it.
An Example
The following code snippet demonstrates how to search for the first available MP3 file.
public String getFirstMP3Path() throws IOException { Enumeration roots = FileSystemRegistry.listRoots(); while (roots.hasMoreElements()) { String root = (String) roots.nextElement(); String match = getFirstMP3Path(root); if (match != null) { return match; } } return null; } public String getFirstMP3Path(String directoryPath) throws IOException { FileConnection directory = (FileConnection) Connector
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CHAPTER 3: Media Playback
.open(directoryPath); Enumeration children = directory.list(); while (children.hasMoreElements()) { String path = (String) children.nextElement(); if (path.indexOf(".mp3") != -1) { return directoryPath + path; } else if (path.indexOf("/") != -1) { String match = getFirstMP3Path(directoryPath + path); if (match != null) { return match; } } } return null; }
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