title: Extend UEventObserver.java
body: <p>Hey!
  For observing GPIO interrupts i want to create an observer class which should be a subclass of UEventObserver.java which finds in frameworks/base/core/java/android/os. The problem is, that this class is not contained in the standard SDK android.jar. Does anybody have got an idea how to extend from this class?
  Thanks a lot!</p>