Page 108 has an issue where a Resources object is called though has not been instantiated yet.  Just move the Resources instantiation further up the chain in the initCompassView() method.

 
protecteded void initCompassView() {
  setFocusable(true);
  Resources r = this.getResources();
 
 // Removed for brevity
 
}

Oh yeah, the Wrox errata form totally sucks. It wants me to create a user and fill out a large form. Otherwise I would have let them know.