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Store: Recent versions of BlackBerry App World will notify users within the store if a previously purchased application has a new version available. Other stores may offer this feature as well; check to see if they support it. In-app updates: BlackBerry s CodeModuleManager API allows one application to install another application. If you have a suite of applications, you could have one app check for updates for another application, then download and install them. This approach allows you to provide your own user interface on the device to manage updates, rather than relying on the BlackBerry browser. Push: If your app is running in a BES environment, the administrator can forcibly send a new version of the app to all affected phones. You also must decide how to let users know when a new version is available. Even if you are using an application store to deliver your updates, keep in mind that some people may frequently use your app but only rarely launch the store, so otherwise they may not be aware of updates. Poll: Your app can connect to a server you control to check for the latest version number. If it finds an update, alert the user within the app. This works best when the user can complete the update on the device, either OTA through the browser or within the app. Push: If you have access to the user s email address or similar information, you can send him notifications when new versions are available. This approach works best if the update must be completed on the desktop. You will generally have the most successful upgrades if you deliver updates through the same channel that originally installed the app. If you initially distributed the app OTA, use OTA for updates; if you used a PC-based application to download the app, use that same app to download the latest versions.
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Nearly every interesting app will make some use of persistent storage. Whether saving games, user preferences, or downloaded art, persistent storage enhances apps by providing more convenient and increasing speed. Persistence also leads to potential problems, though. Different versions of the app may store data in different formats, leading to potential problems if the user updates.
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BlackBerry does not have any logic that associates files to applications. Your app can write to any directory and read from any directory that it wants. When the app is deleted or upgraded, all existing files will remain in place.
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This has a few ramifications. First, if you store actual program data in files, you will be responsible for maintaining your own versioning system. For example, you might tag the start of each file with the version number of the file format. This way, when future versions of the app try to read those files, they can quickly determine whether the files are compatible, and either translate or delete them if the file format has changed. Second, if you store media files like images or sounds, you can keep them in place and safely reuse on newer app versions. However, if you have a larger number of media files, they will still be taking up space after the user deletes your app; this may annoy some people. To be a good citizen on the phone, offer a choice within your app to clean up any such files. Users can run this option before deleting your app and return to a blank slate.
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BlackBerry borrows the Record Management System from Java ME. This provides a very convenient way to store sets of records, such as recent news headlines or restaurant details. Records are stored as raw byte streams, without any version number or ordering. Unlike files, RMS records are tied to a particular application. If you delete an app, all its RMS records will automatically be removed. When you install an upgraded version, the RMS records will remain in place and the new version will be able to read the old data. If a user updates OTA through the web browser, she will be able to choose whether or not to retain the old RMS data. Few applications actually want to deal with raw bytes, so typically an app will serialize and deserialize to translate between the RMS record data and some sort of object. For example, you might define plain Java classes like NewsStory or RestaurantInfo and define methods to create these objects from byte arrays. So long as the class structure remains exactly the same, you can reuse the data across different app versions. However, odds are high that the record format will need to change at some point to support later application features. In order to future-proof your record storage, you should always tag the beginning of an RMS record with the version number. Future versions of the app can inspect this value first and decide how to handle the data that follows. Tip: The version number of your record can be different from the version of your app. Maybe app versions 1.0, 1.3, and 2.0 all use the same record structure; if so, the records can share version number 1. If you later change the structure, such as adding a Byline field to the NewsStory class as part of your changes to app version 2.1, you would increase the RMS record version number to 2.
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