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Creating a UI that is consistent with standard BlackBerry UIs

You can use standard MIDP APIs and BlackBerry® UI APIs to create BlackBerry® Java Application UIs.

The BlackBerry UI APIs are a library of UI components that are designed to provide default layouts and behaviors that are consistent with the core BlackBerry device applications.

  • Screen components provide a standard screen layout, a default menu, and a standard behavior when the BlackBerry device user presses the Escape key or clicks the trackwheel or trackball.
  • Field components provide standard UI elements for date selection, options, check boxes, lists, text fields and labels, and progress bar controls.
  • Layout managers provide an application with the ability to arrange components on a BlackBerry device screen in standard ways, such as horizontally, vertically, or in a left-to-right flow.

You can use the BlackBerry UI APIs to create UIs that include tables, grids, and other specialized features. The BlackBerry Java Development Environment uses a standard Java event model to receive and respond to specific types of events. Applications can receive and respond to BlackBerry device user events, such as when the BlackBerry device user clicks the trackwheel, clicks the trackball, or types on the keyboard, and to system events, such as global alerts, real-time clock changes, and USB port connections.


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