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Conceptually, a custom menu is pretty easy to implement. Basically, you draw the user-interface components onto the Canvas and navigate around them in the same way that you would draw and manipulate any other game graphics. It s just a question of doing it from scratch instead of using built-in widgets. In the Dungeon example, there s one softkey that pops the menu up and down, and then the user navigates around the menu and makes selections using the usual navigation and fire/select keys. The advantage to the custom menu in this example is the fact that the background of the menu is just the current game canvas, which is something you can t do with an lcdui menu. Also the menu is animated: the focused menu item has a three-frame sprite painted behind it made up of stars that give a sparkling effect when the sprite is advanced from one frame to the next (see Figure 10-5).

was left out of the application. This is due to the amount of effort it would take to implement a solid security infrastructure to support the application. I do not want to distract from the purpose of this book.

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Figure 10-5. The image that gives the three frames of the sparkling animation as horizontal strips If you want an animated menu without drawing the entire thing from scratch, it is possible to add animated CustomItems to an lcdui Form. However, in that case you have to implement the CustomItem yourself, so it s really no easier than painting the whole menu as in the Dungeon example. Another possibility in MIDP 3 is to associate an animated image with each item in a list. But again the platform decides how to display the list and will insist on displaying the corresponding strings in one of the platform s fonts and without giving you the option of placing a background image behind it. So the built-in lcdui widgets simply don t give you control over the look of the menu. When you write the code yourself to draw the whole menu onto a Canvas, you can give it whatever look you want. Figure 10-6 shows the result for the improved Dungeon example.

TECHNIC Beam 5 TECHNIC Axle 7 TECHNIC Beam Liftarm Bent 45 Double TECHNIC Axle 10 Electric Cable NXT 20cm Electric Cable NXT 35cm Electric Cable NXT 50cm TECHNIC Beam 11 TECHNIC Axle 12 TECHNIC Beam 13 TECHNIC Beam 15 MINDSTORMS NXT Motor MINDSTORMS NXT TECHNIC Axle Joiner Double Flexible TECHNIC Axle 6 TECHNIC Beam 7 Liftarm Bent 53.5 (4:4) TECHNIC Panel Fairing #5 Tire Model Team Electric MINDSTORMS NXT Sound Sensor Electric MINDSTORMS NXT Light Sensor TECHNIC Beam 7 TECHNIC Axle 8 TECHNIC Beam 9 Liftarm Bent 53.5 (7:3) TECHNIC Steering Link 9L MINDSTORMS NXT Ultrasonic Sensor TECHNIC Beam 9 TECHNIC Bush 1/2 Smooth Bar 4L Light Saber Blade TECHNIC Axle 4 TECHNIC Beam 5 Bent 90 with 4 Pins TECHNIC Universal Joint TECHNIC Beam 5 Liftarm Bent 90 (4:2) Plate 2 3 Wheel Model Team TECHNIC Liftarm Triangle

As shown in this chapter, the Security Application Block can be a very capable tool. In most of today s applications, the ability to authorize users at some level or another is a must. The next chapter will focus on the Validation Application Block, which allows for the validation of data that is passed through an application.

Figure 10-6. The Dungeon game in menu mode on a small-screen emulator The menu works by having a menu softkey switch the DungeonCanvas in and out of menu mode (just toggling a boolean field myMenuMode in the class). When in menu mode, the current game canvas is painted on the screen as usual, but then the menu items are painted on top as sprites. The menu item sprite images are words written on a transparent background (so the game screen is visible between and around the letters) and the letters appear in black or blue depending on whether the item is currently the focused item (as discussed in the section

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