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An optional feature your content provider can offer to its clients is notify-on-change support. This means that your content provider will let clients know if the data for a given content Uri changes.

Figure 9-26. The BusinessLogic class library The Visual Studio 2005 project and solution is now prepared for you to use later within the case study in this book.

For example, suppose you have created a content provider that retrieves RSS and Atom feeds from the Internet based on the user s feed subscriptions (via OPML, perhaps). The content provider offers read-only access to the contents of the feeds, with an eye toward several applications on the phone using those feeds versus everyone implementing their own feed poll-fetch-and-cache system. You have also implemented a service that will get updates to those feeds asynchronously, updating the underlying data store. Your content provider could alert applications using the feeds that such-andso feed was updated, so applications using that specific feed can refresh and get the latest data. On the content provider side, to do this, call notifyChange() on your ContentResolver instance (available in your content provider via getContext().getContentResolver()). This takes two parameters: the Uri of the piece of content that changed and the ContentObserver that initiated the change. In many cases, the latter will be null; a nonnull value simply means that the observer that initiated the change will not be notified of its own changes. On the content consumer side, an activity can call registerContentObserver() on its ContentResolver (via getContentResolver()). This ties a ContentObserver instance to a supplied Uri, and the observer will be notified whenever notifyChange() is called for that specific Uri. When the consumer is done with the Uri, unregisterContentObserver() releases the connection.

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Summary

Over the long haul, there will be two flavors of search available via the Android search system: Query-style search, where the user s search string is passed to an activity that is responsible for conducting the search and displaying the results Filter-style search, where the user s search string is passed to an activity on every key press, and the activity is responsible for updating a displayed list of matches Since the latter approach is under heavy development right now by the Android team, let s focus on the first one.

In the late 1990s, a wave of viruses spread through the Internet, delivered via e-mail, using contact information culled from Microsoft Outlook. A virus would simply e-mail copies of itself to each of the Outlook contacts that had an e-mail address. This was possible because, at the time, Outlook did not take any steps to protect data from programs using the Outlook API, since that API was designed for ordinary developers, not virus authors. Nowadays, many applications that hold onto contact data secure that data by requiring that a user explicitly grant rights for other programs to access the contact information. Those rights could be granted on a case-by-case basis or a once at install time. Android is no different, in that it requires permissions for applications to read or write contact data. Android s permission system is useful well beyond contact data, and for content providers and services other than those supplied by the Android framework. You, as an Android developer, will frequently need to ensure your applications have the appropriate permissions to do what you want to do with other applications data. You may also elect to require permissions for other applications to use your data or services, if you make those available to other Android components. This chapter covers how to accomplish both these ends.

You have finished setting up and organizing the Visual Studio 2005 solution for your application. You are now prepared to establish the overall system s architecture and how each layer of the architecture will be implemented in the Visual Studio solution.

Requesting the use of other applications data or services requires the uses-permission element to be added to your AndroidManifest.xml file. Your manifest may have zero or more uses-permission elements, all as direct children of the root manifest element.

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