However, many states' traffic laws don't mention lane splitting at all. While many states don't have any explicit legal provisions on lane splitting one way or the other, in most states, law enforcement officers can pull a cyclist over for splitting lanes.
IMHO yes, basically foreground is a state in which user can interact with the application through android component like Activity or service. Take example of Musicplayer playing music in foreground service. Also if you have to interact with application through Actvity, the activity has to be in forground.
Figure ground reversal is the inversion of background and foreground. This is often used in logo designs and can often ground an image. In a simple figure ground the borders are perceived as limitless, whereas the figure ground reversal bounds the image.