Blackberry JAVA DEVELOPMENT ENVIRONMENT Handbuch "Erste Schritte - Seite 19

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choiceField.getSelectedIndex()
The
for the choice item that a BlackBerry smartphone user selects from a choiceField drop-down list. Invoking
UiApplication.getUiApplication.pushScreen(_infoScreen)
instance of itself to display a screen with information on the city a BlackBerry smartphone user selects from a
drop-down list.
choiceField
CityInfoScreen
1.
In the
BlackBerry smartphone user selects the menu item.
private MenuItem _viewItem = new MenuItem("More Info", 110, 10) {
CityInfoScreen
2. In the
a BlackBerry smartphone user selects.
public void run() {
//Store the index for the city a BlackBerry smartphone user selects
select = choiceField.getSelectedIndex();
//Create an instance of the screen that displays information about a city the BlackBerry
smartphone user selects
_infoScreen = new InfoScreen();
//Push the screen with information on the city the BlackBerry smartphone user selects to
the display stack and paint this screen
UiApplication.getUiApplication.pushScreen(_infoScreen);
}
Create a menu item that a BlackBerry smartphone user clicks to close a
BlackBerry device application
CityInfoScreen
1.
In the
BlackBerry® smartphone user selects a menu item.
private MenuItem _closeItem = new MenuItem("Close", 200000, 10) {
2. In the
CityInfoScreen
application's
onClose()
public void run()
{ onClose();
}
};

Add menu items to the CityInfo application menu

The
makeMenu()
method is inherited from the
menu items to a menu. If you override the
menu of the BlackBerry device application, you must call this method on the parent class.
2: Create a BlackBerry device application with advanced UI features
method lets a BlackBerry device application retrieve the index number
MenuItem
class, create a
run()
class, create a
method for the
MenuItem
class, create a
class, create a
run()
method that defines the action that calls the BlackBerry device
method when a BlackBerry smartphone user selects the menu item.
MainScreen
makeMenu()
lets a BlackBerry device application use an
with text that reflects the action that occurs when a
MenuItem
that displays information about a city
with text that reflects the action that occurs when a
class and lets a BlackBerry® device application add
method, to add the menu items of the main screen to the
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