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The itemStateChanged() method is defined outside the constructor and contains logic to evaluate the item passed to the method An if statement is used in this example to determine whether the selected item is the instance of the ChoiceGroup class If so, the item is processed according to the business rules of the application
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private Form form; private ChoiceGroup choiceGroup; choiceGroup = new ChoiceGroup("Pick One", ChoiceEXCLUSIVE); formappend(choiceGroup); formsetItemStateListener(this); public void itemStateChanged(Item item) { if (item == choiceGroup) { // do some processing } }
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You are probably familiar with check boxes and radio buttons used in graphical user interfaces for choosing one or multiple choices from a selection of options Likewise, check boxes and radio buttons are used to display selected options that were previously chosen Check boxes and radio buttons are often grouped into sets of options, although there are times when one check box, rather than multiple check boxes, is required by an application Radio buttons are almost always displayed in a set of radio buttons The primary difference between a set of check boxes and a set of radio buttons, besides their obvious appearance, is the number of check boxes or radio buttons that users can select Users can choose multiple check boxes within a set of check boxes, while they can choose only one radio button within a set of radio buttons For example, radio buttons are used on a form to identify the user s gender The user can be either male or female, and therefore selection of one precludes the other In contrast, a set of check boxes is used to identify preferences, such as choice of movies Each check box within the set is a movie category The selection of one category does not preclude the selection of other categories J2ME classifies check boxes and radio buttons as the ChoiceGroup class An instance of the ChoiceGroup class can be one of two types: exclusive or multiple An exclusive instance appears as a set of radio buttons, and a multiple instance contains one or a set of check boxes You determine the format of an instance of a ChoiceGroup class by passing the ChoiceGroup class constructor a choice type, as shown in Table 6-2
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Description
Only one selection available at any time (radio button) Zero or more selections available at any time (check box) Only one selection at any time The selection generates a command event automatically No icon is used (menu list)
Table 6-2
Choice Types for ChoiceGroup Object and List Object
J2ME USER INTERFACE
When the user selects either a radio button or check box, the device s application manager detects the event and calls the itemStateChanged() method of the MIDlet, as described in the Item Class section of this chapter The itemStateChanged() method determines whether the item selected is an instance of the ChoiceGroup If so, then either the getSelectedFlags() method or getSelectedIndex() method must be called to retrieve the item selected by the user The getSelectedFlags() method returns an array that contains the status of the selected flag for each member of the instance of the ChoiceGroup class (each radio button or each check box) The MIDlet must step through each element of the array to determine whether the selected flag status is true or false If true, the radio button or check box that corresponds to the index of the array element was selected by the user If false, the user did not make a selection The getSelectedIndex() method returns the index number of the item selected by the user, such as a radio button The index number is typically passed to the getString() method, which returns the text of the selected radio button or check box You ll learn this technique in the next section of this chapter Instead of using the ItemStateListener and itemStateChanged() methods, you can place a Command on the screen and implement a CommandListener and define an actionCommand() method As you ll recall from 5, the device s application manager notifies the CommandListener when a command is selected, and then the actionCommand() method you define in the MIDlet is called The actionCommand() method then calls either the getSelectedFlags() method or the getSelectedIndex() method to identify the item selected by the user The Quick Reference Guide section of this chapter contains methods that you can use with instances of the ChoiceGroup class
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