Android dev: How to Increment ProgressBar in active activity

Suppose I'm watching a video in开发者_开发问答 some video player.

I want to create a service which whenever an event of some kind occurs, the service increments the position of the progress bar in the currently active video player.

How can this be done?

Thanks!

---

You need a player who offers that option with a ContentProvider, BroadcastReceiver or similar =(