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J2ME: The Complete Reference
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First, the getSelectedIndex() method is called to return the index number of the selected list item Index numbers are assigned sequentially beginning with zero as each item is appended to the list This means that the first item is New and has the index value zero The second item has the index number of one as a string value of Open The if statement evaluates the value returned by the getSelectedIndex() method An alert is displayed when a match occurs The alert shows the list item selected by the user of the MIDlet The MIDlet terminates like the other examples in this chapter when the user selects the Exit command
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Listing 6-23 The JAD file for Listing 6-24
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MIDlet-Name: ListImplicit MIDlet-Version: 10 MIDlet-Vendor: MyCompany MIDlet-Jar-URL: ListImplicitjar MIDlet-1: ListImplicit, , ListImplicit MicroEdition-Configuration: CLDC-10 MicroEdition-Profile: MIDP-10 MIDlet-JAR-SIZE: 100
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Listing 6-24 Displaying an implicit List class
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import javaxmicroeditionmidlet*; import javaxmicroeditionlcdui*; public class ListImplicit extends MIDlet implements CommandListener { private Display display; private List list; private Command exit; Alert alert; public ListImplicit() { display = DisplaygetDisplay(this); exit = new Command("Exit", CommandEXIT, 1); list = new List("Menu:", ListIMPLICIT); listappend("New",null); listappend("Open",null); listaddCommand(exit); listsetCommandListener(this); } public void startApp() { displaysetCurrent(list); } public void pauseApp() {
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} public void destroyApp(boolean unconditional) { } public void commandAction(Command command, Displayable displayable) { if (command == ListSELECT_COMMAND) { String selection = listgetString(listgetSelectedIndex()); alert = new Alert("Option Selected", selection, null, null); alertsetTimeout(AlertFOREVER); alertsetType(AlertTypeINFO); displaysetCurrent(alert); } else if (command == exit) { destroyApp(false); notifyDestroyed(); } } }
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Listing 6-26 displays an instance of a List class in the form of check boxes (Figure 6-11) This instance is created similar to Listing 6-12 except that the format type of the instance is MULTIPLE Four items are added to the list by calling the append() method None of the items is associated with an image, so the second parameter of the append() method is null Unlike the implicit formatted instance of the List class, the multiple format does not automatically generate a command event Instead, you must create an instance of the Command object that, when selected, causes the MIDlet to process the list The Submit command is used in this example for that purpose The list is displayed the same way as in Listing 6-24 The if statement within the actionCommand() method traps the submit event and causes statements within the if statement to process the user selections First, a boolean array is declared having the size of the value returned by calling the size() method, which is the number of items in the instance of the List class The StringBuffer is also created Next, the getSelectedFlags() method is called and is passed the boolean array The getSelectedFlags() method populates the boolean array with the selected status of each item on the list The MIDlet then steps through each item using a for loop The selected flag status of the boolean array element is compared to the boolean value true for each iteration of the for loop If the value of the boolean array element is true, the getString() method is called and passed the index number of the current boolean array element, which is the same index number of the item on the list The getString() method returns
J2ME: The Complete Reference
Figure 6-11
Displaying a list in the form of check boxes
the text of that item, which is then appended to the instance of the StringBuffer class called message An alert is displayed on the screen containing the text of each item selected by the user The Submit command is then removed from the screen, leaving the user to close the alert dialog box and then terminate the MIDlet by selecting the Exit command
Listing 6-25 The JAD file for Listing 6-26
MIDlet-Name: ListCheckBox MIDlet-Version: 10 MIDlet-Vendor: MyCompany MIDlet-Jar-URL: ListCheckBoxjar MIDlet-1: ListCheckBox, , ListCheckBox MicroEdition-Configuration: CLDC-10 MicroEdition-Profile: MIDP-10 MIDlet-JAR-SIZE: 100
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