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Getting started guide

3. In the constructor, add the following code:

super();

LabelField title = new LabelField("HelloWorld Sample", LabelField.ELLIPSIS |

LabelField.USE_ALL_WIDTH);

setTitle(title);

add(new RichTextField("Hello World!"));

Allow the HelloWorld application display a screen

pushScreen()

The

method is inherited from the

and paints it. The BlackBerry® JVM maintains screens in a display stack. See

information.

HelloWorld

In the

//display a new screen

pushScreen(new HelloWorldScreen());

Display a message when a BlackBerry smartphone user closes the HelloWorld

application

The

onClose()

method is inherited from the

a close event has occurred.

The

Dialog.alert()

method creates an alert dialog box that a BlackBerry device application can use to notify a

BlackBerry smartphone user of an event or some important information. The dialog uses an exclamation mark

bitmap. See

Dialog

in the API Reference for more information.

In the HelloWorldScreen class, overide the onClose() method using the following code:

public boolean onClose()

{ Dialog.alert("Goodbye!");

System.exit(0);

return true;

}

Test the HelloWorld application in the BlackBerry Smartphone Simulator

From the Run menu, click Run As > BlackBerry Simulator.

2. In the Choose a launch Configuration dialog box, select a launch configuration.

3. Press OK.

4. From the HomeScreen of the BlackBerry® Smartphone Simulator, select and open the HelloWorld . The

BlackBerry device application displays the text HelloWorld!.

5. From the FullMenu of the BlackBerry device application, select the Close menu item. The BlackBerry device

application displays a dialog with the text Goodbye!.

constructor, add the following code:

Screen

UiApplication

class and pushes a screen onto the display stack

class and indicates to an BlackBerry® device application that

Screen

in the API Reference for more