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The MIDlet in Listing 6-2 is called DisplayAlert and begins by declaring references to instances of the Display class, Alert object, Form object, and Command object There is also a boolean variable, which is used to flag whether or not the user made one attempt to terminate the MIDlet Next, the constructor is defined, first by assigning a false value to the exitFlag variable The false value is the default value and indicates that the person hasn t made the first attempt to exit the MIDlet Three instances are then created and assigned to the appropriate reference These are instances of the Display class, Command class, and Form class The instance of the Command class is associated with the instance of the Form class by calling the addCommand() method and passing it reference to the instances of the Command class The last statement in the constructor associates a CommandListener to the instance of the Form class by invoking the setCommandListener() method The registered CommandListener is notified of command events as they occur The startApp() method is then defined with one statement that calls the setCurrent() method to display the instance of the Form class on the screen The startApp() method is invoked by the device s application manager The pauseApp() is defined as an empty method Remember that every MIDlet must have a pauseApp() defined, even if no statements are executed when the application manager calls the pauseApp() method The destroyApp() method also must be defined in every MIDlet and is the method called before the MIDlet terminates The destroyApp() method is passed a boolean value that indicates whether termination of the MIDlet is conditional or unconditional Conditional termination requires that a particular condition be met prior to termination The condition in this example is that the value of the boolean parameter is false, indicating that the MIDlet hasn t finished processing, although the user requested that the MIDlet terminate An exception is thrown when this occurs An unconditional termination indicates that no condition must be met before the MIDlet terminates, which happens in this example when the user selects the Exit command for the second time The commandAction() method processes command events trapped by the CommandListener The commandAction() is called when the person selects any command available on the device The CommandListener s commandAction() method processes command events as notified by the system/application manager Only the Exit command is evaluated in this example The MIDlet flow enters the try { } block when the Exit command is received by the commandAction() method, and the MIDlet evaluates whether or not the value of the exitFlag variable is false If false, this means that the user has selected the Exit command only once This causes the creation of an instance of the Alert class, which is assigned to the appropriate reference The title of the alert instance is Busy, and the message is Please try again No image is being used with the alert instance; therefore the third parameter is null The AlertType of the alert instance is WARNING The alert dialog box is modal, so the timeout setting must be set to AlertFOREVER This is accomplished by calling the setTimeout() method and passing it the AlertFOREVER integer. vb.net ean 13 reader .NET EAN - 13 Barcode Reader for C#, VB . NET , ASP.NET Applications
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