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Activities: The building block of the user interface is the activity. You can think of an activity as being the Android analogue for the window or dialog box in a desktop application. While it is possible for activities to not have a user interface, most likely your headless code will be packaged in the form of content providers or services. Content providers: Content providers provide a level of abstraction for any data stored on the device that is accessible by multiple applications. The Android development model encourages you to make your own data available to other applications, as well as your own. Building a content provider lets you do that, while maintaining complete control over how your data is accessed. Services: Activities and content providers are short-lived and can be shut down at any time. Services, on the other hand, are designed to keep running, if needed, independent of any activity. You might use a service for checking for updates to an RSS feed or to play back music even if the controlling activity is no longer operating. Intents: Intents are system messages, running around the inside of the device, notifying applications of various events, from hardware state changes (e.g., an SD card was inserted), to incoming data (e.g., an SMS message arrived), to application events (e.g., your activity was launched from the device s main menu). Not only can you respond to intents, but you can create your own to launch other activities or to let you know when specific situations arise (e.g., raise such-and-so intent when the user gets within 100 meters of this-and-such location).

This exercise shows how to insert the proper information in the database when a user adds a product to their shopping cart and then sees the shopping cart with the selected items. Follow these steps: 1. You ll start at the database and create the stored procedure script. This stored procedure is named ShoppingCart_Insert, and it is fairly complex. It will first query the number of items that reside in the shopping cart with the same product ID and the same cart ID. Then, if that number is greater than zero, the product found will be updated. If that number is zero, the product will be inserted in the ShoppingCart table. So, execute the following script against the database: CREATE PROCEDURE ShoppingCart_Insert @CartGUID nvarchar(50), @ProductID int, @Quantity int AS DECLARE @ItemCount int SELECT @ItemCount = Count(ProductID) FROM ShoppingCart WHERE ProductID = @ProductID AND CartGUID = @CartGUID IF @ItemCount > 0 /* Update quantity */ UPDATE ShoppingCart SET Quantity = (@Quantity + ShoppingCart.Quantity) WHERE ProductID = @ProductID AND CartGUID = @CartGUID ELSE /* No quantity found - insert */ INSERT INTO ShoppingCart (CartGUID, ProductID, Quantity) VALUES (@CartGUID, @ProductID, @Quantity)

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2. You have created the stored procedure in the database to use. Next, proceed to the data access layer and to the LIttleItalyVineyard.DataAccess class library project. In this project, since this is the first time you are inserting an item in the database, you need to create a folder in the project, thus creating another namespace. To do so, right-click the LittleItalyVineyard.DataAccess class library, and choose Add New Folder, as shown in Figure 17-1. Please note that this will create a physical folder on the file system and not a virtual folder.

Android comes with a number of features to help you develop applications: Storage: You can package data files with your application, for things that do not change, such as icons or help files. You also can carve out a bit of space on the device itself, for databases or files containing user-entered or retrieved data needed by your application. And, if the user supplies bulk storage, like an SD card, you can read and write files there as needed. Network: Android devices will generally be Internet-ready, through one communications medium or another. You can take advantage of the Internet access at any level you wish, from raw Java sockets all the way up to a built-in WebKit-based web browser widget you can embed in your application.

Figure 11-4. The same application, made ugly You can trigger the context menu by doing a tap-and-hold on any item in the list (Figure 11-5).

Figure 17-1. Adding a new folder 3. This creates a new folder in the class library project. Next, rename the new folder to Insert, as shown in Figure 17-2.

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