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} else if(c == myAlertDoneCommand) { try { destroyApp(false); notifyDestroyed(); } catch (MIDletStateChangeException ex) { } } else if(c == myPrefsCommand) { When you create an Alert in MIDP 2.0 and set its timeout to Alert.FOREVER, the Alert automatically contains a Done Command, which corresponds to the default Command Alert.DISMISS_ COMMAND. With the default dismiss command, when the user clicks the Done button, the previous Displayable becomes current (or another Displayable of your choice becomes current if you constructed the Alert with a Displayable as an argument). Therefore, it isn t usually necessary to listen for the Alert s dismiss command. However, in this case, I added my own dismiss command for two reasons: First, I d like this game to be compatible with MIDP 1.0.4, in which the field Alert.DISMISS_COMMAND doesn t exist. Second, if the screen is really the wrong size for the game, I d like the game to end when the Alert is done rather than just going to another Displayable. But I can t just end the game right after calling Display.getDisplay(this). setCurrent(errorAlert) because that method returns immediately after setting the current display and doesn t wait for the user to be done with the Alert. So, if I end the application immediately after setting the Alert to the current Displayable, it appears for only a split second and then disappears. Instead I listen for my custom Done Command and end the game when the command has been activated. It s a bit of a technical point, and some professional game developers avoid using Alerts because they don t simplify the code much compared to the potential confusion caused by their special behavior.

You must insert two LEGO yellow rubber bands in the elbows as shown in Figure 8-11 (steps a through f) There, you can see the left elbow montage; repeat the same procedure for the right elbow before attaching the arms to the shoulders Make sure to align the forearms levers before adding the chain to the gears If their position is not correct, the final result will be asymmetrical once they are attached to the shoulders driving axle..

Listing 12-4. Using the EnumConversionValidatorAttribute Class public class MyClass { private int m_MyMinValue; private int m_MyCurrentValue public string MyMinValue { get { return m_MyMinValue; } set { m_MyMinValue = value; } } [PropertyComparisonValidator("MyMinValue", ComparisonOperator.GreaterThanEqual)] public string MyCurrentValue { get { return m_MyCurrentValue; } set { m_MyCurrentValue = value; } } }

CHAPTER 8 JOHNNXT IS ALIVE!

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Although the GUI functionality is contained in the javaxmicroeditionlcdui package, I ve organized things by placing some of the main buttons in my MIDlet subclass (called Maze in this example) because the functions of these buttons relate to my MIDlet s lifecycle Looking at the Maze class in Listing 2-1, you ll notice that buttons and menu items are instances of javaxmicroeditionlcduiCommand There s no Button class and no MenuItem class This is because your target screen and button configurations vary so much from device to device that it doesn t make sense to have the MIDlet developer decide which commands should be placed in buttons and which should be placed in menus.

The two conversion validators included with the Validation Application Block attempt to convert a specific type to another type. If the conversion is successful, the object passes validation. The two conversion classes are EnumConversionValidator and TypeConversionValidator. EnumConversionValidator The Validation Application Block supports a validator called EnumConversionValidator, which determines if a string representation of an enumerator can be converted to a specific enumerator type. For example, it could test to see if Friday can be converted to the System.DayOfWeek enum type. Figure 12-11 shows the class diagram of the EnumConversionValidator public members.

The EnumConversionValidator class also supports attribute-based validation via the EnumConversionValidatorAttribute class. Like EnumConversionValidator, EnumConversionValidatorAttribute has two overloads. One overload takes the enum type you want to test. The other overload takes an enum type and a Boolean parameter, negated, indicating whether validation results should be produced if the condition is met. By setting the negated parameter to true, the positive condition will produce validation results. This is inverse of the default behavior. Figure 12-12 shows the class diagram of public members for the EnumConversionValidatorAttribute class.

CHAPTER 8 JOHNNXT IS ALIVE!

That s the theory anyway in practice you generally have to produce different versions of a game for different device groups with different capabilities, so it s common to customize the GUI for different devices as well (see 10) However, it s good to try to keep the application as portable as possible, and the system of using Command objects that the platform can map to a softkey or a stylus touch or whatever makes it easy to write a GUI that works well on devices with vastly different screen configurations So you just create a Command object and give the device a bit of information about the Command, and the device does the work of arranging your Commands for you.

Figure 12-12. EnumConversionValidatorAttribute class diagram of public members Listing 12-5 shows an example of using EnumConversionValidatorAttribute. Listing 12-5. Using the EnumConversionValidatorAttribute Class public class MyClass { private string m_MyEnumValue; [EnumConversionValidator(typeof(System.DayOfWeek))] public string MyEnumValue { get { return m_MyEnumValue; } set { m_MyEnumValue = value; } } }

CHAPTER 8 JOHNNXT IS ALIVE!

TypeConversionValidator The TypeConversionValidator class is very much like the EnumConversionValidator class. It takes a string and attempts to convert it to a specific type of object using the TryParse method of that specific object type. Figure 12-13 shows the public constructors available

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