Blackberry Smartphones Specifications download pdf (Page 44)

• Use a vertical layout for your application screens.

• Consider arranging the UI components on application screens using the BlackBerry API layout managers. For more

information about arranging UI components, see the API reference guide for the BlackBerry® Java® SDK and the BlackBerry

Java Application UI and Navigation Development Guide.

• On BlackBerry devices with a touch screen, verify that the screens display correctly in both portrait and landscape view.

• Display the most important information at the top of the screen. For example, for contact information, display the name

first, followed by the email address and phone numbers. Display a field such as the Notes field last.

• Limit the number of components that appear on the screen at one time.

• Use line separators on a screen to separate components or to indicate a group of components.

• Consider localization requirements as early in the design process as possible. Localization can affect the layout of screens.

Related topics

Display specifications and interaction methods for BlackBerry devices, 12

Dialog boxes

Use dialog boxes to perform the following actions:

• Prompt users for information that is required to complete a user-initiated task.

• Inform users of urgent information or the status of important actions.

• Warn users of unexpected or potentially destructive conditions or situations.

Dialog boxes are modal; they interrupt the normal operation of the BlackBerry® device and are pushed to the top of the stack.

A dialog box includes a message, buttons that allow users to perform an action, and an indicator that indicates the type of dialog

box. The size of the dialog box depends on the size of the BlackBerry device screen. The theme that users select on their BlackBerry

device determines the visual style of the dialog box.

Best practice: Implementing dialog boxes

• Use buttons to confirm or cancel actions in dialog boxes. Avoid using links or other components.

UI Guidelines

Dialog boxes

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Blackberry Smartphones Specifications Page 44