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Commands, Items, and Event Processing
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A message is displayed before the exception is thrown by the MIDlet on the default color phone emulator
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the commandAction() method, passing the command selected by the user to the method The selected command is then compared to known commands within the MIDlet, which in this example is the Exit command The MIDlet enters the try { } block within the commandAction() method if the Exit command was selected by the user The value of the exitFlag is then evaluated within the try { } block If the value is false, an instance of the StringItem class is created and is displayed on the screen by passing the instance to the append() method The destroyApp() method is then called and passed a false value A false value means that there is not an unconditional termination of the MIDlet because processing cannot be disrupted For the sake of this example, we re assuming that processing is ongoing and a fatal error would occur should it not be allowed to complete before the MIDlet is terminated However, the destroyApp() method is passed a true value if the value of the exitFlag is true, indicating that the MIDlet can be terminated unconditionally Notification of the pending destruction of the MIDlet is then sent by invoking the notifyDestroyed() method
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Notice that the destroyApp() method is capable of throwing a MIDletStateChangeException A MIDletStateChangeException is thrown if the destroyApp() method is passed a false value indicating there is a condition to termination of the MIDlet The MIDletStateChangeException is trapped by the catch { } block in the commandAction() method where the value of the exitFlag is set to true The next time the user selects the Exit command the destroyApp() is called and passed a true value, meaning the MIDlet can terminate unconditionally
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Steps for Throwing a MIDletStateChangeException
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Listed here are the steps required for throwing a MIDletStateChangeException 1 Declare references
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2 Set default value for the exit flag to false 3 Obtain a reference to an instance of the Display class 4 Create an instance of the Command class to exit the MIDlet 5 Create an instance of the Form class 6 Associate the command to the form 7 Associate a CommandListener with the form 8 Display the form on the screen 9 Evaluate the command selected by the user 10 If the Exit command is selected, determine whether conditions are safe to terminate the MIDlet 11 If conditions are not safe to terminate the MIDlet, create an instance of the StringItem class with the message Busy, please try again 12 Display the instance of the StringItem class on the screen 13 Call the destroyApp() method with a conditional termination notice 14 If conditions are safe to terminate the MIDlet, call the destroyApp() method with an unconditional termination notice, and notify the application manager of pending termination of the MIDlet 15 When the destroyApp() method is called, evaluate the status of the unconditional parameter 16 If the unconditional parameter is false, throw a MIDletStateChangeException; otherwise terminate the MIDlet 17 Trap exceptions thrown within the commandAction() method 18 If the MIDletStateChangeException is thrown, indicate that conditions are now safe to terminate the MIDlet by assigning a true value to the exit flag 19 Terminate the MIDlet when the Exit command is entered the second time
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5:
Commands, Items, and Event Processing
Quick Reference Guide
This quick reference guide provides a brief overview of classes used by J2ME for the Display class, Command class, and Item class Full details of these classes and all Java classes and interfaces are available at javasuncom javaxmicroeditionlcduiDisplay Class Method
static Display getDisplay(MIDlet midlet) Displayable getCurrent() void setCurrent(Alert alert, Displayable displayable) void setCurrent (Displayable displayable) boolean isColor() int numColors() void callSerial(Runnable runnable)
Description
Retrieve an instance of the Display class Retrieve the current instance of Displayable class Display the specified instance of the alert dialog box and then the specified instance of the Displayable class Display the specified instance of the Displayable class Determine whether the device supports color Retrieve the number of colors or shades of gray that are available on the device Call an instance of the Runnable class after repainting J2ME USER INTERFACE
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