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hapters 5, 6, and 7 were devoted to MIDP s generalized user-interface APIs. Clever as these APIs are, they are unsuitable for game development and other specialized user interfaces. Games are programmed closer to the metal than other applications. MIDP offers a class, javax.microedition.lcdui.Canvas, that provides low-level access to a device s screen and input facilities. You can find out exactly which keys a user is pressing and draw whatever you want on the screen. The Game API, contained in the javax.microedition.lcdui.game package, includes a refinement of Canvas and classes for layer-based graphics and sprite animations. The Game API is fully discussed in 14. In this chapter, you ll learn the basics of Canvas and drawing with the Graphics class.

7. Click the Advanced tab to view the device and source properties. Just as for fixed RFID readers, mobile readers can have properties bound to the device or any sources on the device. Typical sources on a mobile device include RFID (the primary RFID device) and Barcode. Click the drop-down box to expose the list of sources, as shown in Figure 7-7.

may compromise the performance or the flexibility of your code. Most of the time, you ll stick with deferred execution, despite the potential confusion it causes.

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Unfortunately, error handling in an application that uses the Entity Framework is not always this straightforward. In more complex examples, database operations might take place in several places. For example, in the following section you ll see how you can use relationships to show related information from different tables. When taking this approach, a database operation occurs whenever you begin iterating over a new collection of records with a foreach block. So, what s the solution One approach is to use the ToList() method, which converts any entity collection into an ordinary in-memory collection, triggering the database query in the process: NorthwindEntities entities = new NorthwindEntities(); GridView1.DataSource = entities.Products.ToList(); GridView1.DataBind(); Although this makes the data access operations more predictable, it s a dangerous practice. As you ll see in the Querying with LINQ to Entities section, deferred execution allows LINQ and the Entity Framework to optimize database queries. If you get into the habit of calling ToList(), you effectively circumvent this mechanism, which can harm the performance of your application. If you don t want to worry about the precise code location where an exception might occur, you can use a better solution just wrap everything in a giant exception handling block that catches databasespecific exceptions. The most straightforward way to do this is to move your data access code to another method. Then you can wrap your method call in an exception block, like this:

try { // Call the method that does all the data processing and display. DataBindProductGrid(); } catch (SqlException err) { ... } Finally, as a last resort you can handle the Application.Error event described in 5 to deal with any problems that slip through the cracks.

Canvas is the heart of MIDP s custom user-interface API. To use it, you must create a subclass of Canvas. This differs from the Screen subclasses, which are ready to use out of the box. Aside from that, however, Canvas fits in very nicely with the other subclasses of Displayable. A MIDlet can mix and match regular screens and Canvases. In a game, for instance, a high-score screen might be a Form, while the game itself would be played on a Canvas. Canvas contains event-handling methods that are invoked by the MIDP implementation whenever something important happens. When the user presses a key, or when the screen needs to be painted, one of Canvas s methods will be called. Most of these methods have empty implementations in Canvas. To respond to an event, you need to override the appropriate method and provide an implementation. The one exception to this rule is the paint() method, which is declared abstract and thus must be defined in subclasses.

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