General :: Video Player - Track Seekbar Scrub Past Markers?

I am currently working on a video player using the VideoView and I am controlling it with the MediaController.

The first thing I would like to do is to be able to place markers along the seekbar, such as 25% of the clip. I want to fire an event when this mark is hit or scrubbed past. Throwing an event when this marker is hit with the video playing regularly will be easy because I should be able to just use getCurrentPosition and checking to see if it is 25% of the total clip. The issue I am having is how to fire the event if the user scrubs past the 25% point.

The second thing I am trying to do is just show a visual marker along the seekbar that I can display a marker, lets say at the 25% point, 50% point, etc.