Android onTrackballEvent and Click

I want to capture onClick events for the trackball on a HTC Hero. This event is firing and I can get the direction of motion of the trackball:

@Override
public boolean onTrackballEvent(MotionEv开发者_如何学运维ent event) {

}

How do I find out if the event was a click event?

Try overriding onKeyDown(), watching for the KeyEvent.KEYCODE_DPAD_CENTER event.