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UI Guidelines

Design principles

As you identify the goal, you might need to make some tough decisions. For example, if the main purpose of your

application is to allow users to view pictures, make sure you limit the functionality that you provide on the screen only to the

features that make viewing pictures a fantastic experience for users. Where possible, move the functionality that is not

essential to the primary workflow to a menu.

If you are porting an application that is designed for a computer to the BlackBerry PlayBook tablet, simplifying the

functionality might be a challenge. Design your application to include the essential features for mobile users. Provide only

the features that people really care about.

Support user data input

You should support data input for your users as much as possible. This could be as easy as opening the numeric keyboard

for a user to type a phone number in a field or capturing data using other means, such as GPS, a Bluetooth enabled sensor,

a camera, or an accelerometer. Limiting the data that users need to input can reduce the burden on users and greatly

improve the usability of your application.

Another way to support user data input is to make sure that you combine similar input operations together in the flow of

your application, so that users don't need to change input modes or navigate to another screen. For example, a mapping

application might allow users to place landmarks on a map. You could allow users to access a menu, choose a landmark

tool, reactivate the map content area, and then place the landmark. But a better solution might be to allow users to simply

touch and hold the desired map location and have your application place a landmark pin at that location after a few

seconds.