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Two main thread-related items have been eliminated in CLDC: the class ThreadGroup and the possibility of marking your threads as daemon threads. You won t miss them. This is another case of the CLDC specification authors eliminating something that you didn t need anyway. Daemon threads can be useful in many programs. Marking a thread as a daemon is a way of telling the program not to wait around for the thread to finish if the rest of the program is done, just exit. For example, in a game you may use a daemon thread to move around background items. Throughout the game you want the background items to keep moving, but once the player s character is dead, of course you don t want the program to keep going just for the sake of the background animation. But in a Mobile Internet Device Profile (MIDP) program, daemon threads wouldn t work as you may like them to work. Since a MIDlet is run by application management software (AMS), the end of the MIDlet s lifecycle doesn t correspond to the Java Virtual Machine (JVM) exiting. Regardless of how many threads the MIDlet has started, and regardless of whether they re active, the MIDlet s active life ends when it s destroyed. It s therefore not even clear what it would mean for a thread to be a daemon in this case.

Summary

Flash Catalyst is a valuable tool and will change designer-developer workflow. Flash Catalyst will soon be an integrated part of the development cycle and you will find it hard to work without it, mainly because it will save you valuable development time. The designer can create the artwork and adjust the artwork, as you need to make changes. While the developer may be the one converting the artwork into code, designers and developers can work in parallel to make the changes as required. For example, you may notice that adding a drop-shadow to a vector graphic in Illustrator will convert the graphic into an image in Catalyst. This does not happen all the time except in certain cases. You can work with the designer and have these images adjusted. As you work with the designer, you can show him or her how you are working with Catalyst so the designer can slowly take over some of the Catalyst work when he or she is ready.

Microsoft Internet Explorer is one of the two browsers mentioned in this book that allow crossdomain HTTP requests if the permission has been granted. Internet Explorer grants permissions only if the site has been assigned as trusted. An algorithm is implemented so that trusted sites do not apply the Same Origin Policy. So, for example, to set the site http://192.168.1.101:8080 as trusted, you would use the following steps: 1. Open Microsoft Internet Explorer and from the menu select Tools Internet Options. A dialog box similar to Figure 2-13 is generated.

4

The ThreadGroup class, on the other hand, is essentially useless even for versions of Java that allow its use Its original purpose was to group the threads of a program to simplify pausing, restarting, and stopping them all at once But as you probably know, the methods Threadsuspend(), Threadresume(), and Threadstop() were all deprecated because they re inherently unsafe ThreadGroup s uncaughtException() method can be useful, but without the thread lifecycle methods, putting your threads in a ThreadGroup isn t significantly more useful than grouping them in a Vector You may wonder what you re supposed to do to pause or stop your game if it has multiple threads running If you ve done much programming with threads, you probably already know the answer Your thread classes should have fields that serve as flags, telling the thread to pause or stop.

Adobe Integrated Runtime (AIR) technology provides an opportunity for you to bring your Flex application into a whole new domain, the desktop. The API provides access to almost every nook and cranny you could want: the file system, native windows, native menus, and more. It also includes an embedded local database that you can use for offline storage. Plus it s portable between Mac, Windows, and Linux. With these tools in hand and better integration of AIR 2.0 with the OS, it s hard to think of any desktop application that you can t write with AIR. In this chapter, we ll show several complete examples that push the limits of the AIR API. You are free to use these as templates for your own applications.

Figure 2-13. Internet Options dialog box used to define a trusted site 2. Select the Security tab and then the Trusted Sites icon, resulting in a dialog box similar to Figure 2-14.

If you haven t built an AIR application before, not to worry, the process is very similar to building a new Flex browser application.

Other classes can set these fields, and then your Thread subclass can query the fields and pause or stop when it becomes convenient to do so In fact, this is exactly what I did in the GameThread class of the previous version of the Tumbleweed game Since that class will not be changed for this version, I won t reprint it here See the Using the Thread Class section in 3 to review how it works The pause flags are set by my MIDlet subclass (called Jump) I ve included the code for Jump in Listing 4-1 because there are some changes in this version.

Figure 4-1.