Blackberry Smartphones Specifications download pdf (Page 41)

Before information displays on a screen temporarily When information displays on a screen temporarily

Best practice: Displaying information on a screen temporarily

• Avoid displaying information or components that users require to complete a task. Display only secondary information, such

as descriptions or metadata, on a screen temporarily.

• To avoid distracting users from their primary task, display temporary information judiciously.

• Use the EyelidFieldManager class to display information temporarily. For more information about displaying

information temporarily, see the API reference guide for the BlackBerry® Java® SDK and the BlackBerry Java Application

UI and Navigation Development Guide.

Screen transitions

You can create a transition to apply a visual effect that appears when an application opens or closes a screen on a BlackBerry®

device. Creating transitions between screens helps users understand the structure of your application. Consider the following

guidelines when implementing screen transitions:

Transition When to use Details

Fade The content is the same but users change their view of

the content (for example, switching between day and

week view in a calendar or switching between viewing

a list of images and viewing the thumbnails of the same

images).

Set the duration of the fade to 150

milliseconds.

UI Guidelines

Screen transitions

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Blackberry Smartphones Specifications Page 41