Handle left right trackball swipe in blackberry

How do I write code to handle event that are fir开发者_C百科ed when the track ball in a black berry app is swiped left and right?

The navigationMovement method of the selected field is called when such an event occurs. You can override it an place your logic there. The first parameter helps you determine what kind of movement it is(left/right) :

dx - Magnitude of navigational motion: negative for a move left and postive for a move right.