You can use the APIs in the net.rim.device.api.ui.accessibility package to allow a BlackBerry® device application that uses custom UI components to send information to an assistive technology application. When a custom UI component changes, an assistive technology application receives a notification about the change and can obtain more information about the change from the custom UI component.

For example, if a BlackBerry device application uses a class called myTextField that extends the TextField class, when a BlackBerry device user changes the text in a myTextField instance, an assistive technology application receives notification of the change and can retrieve data such as the text that the user selects or changes.