How to distinguish whether onDestroy() is called as part of configuration change sequence?

In my Activity some external thing (service) need to be destroyed in onDestroy(). But I do not want this when configuration change happens (e.g. keyboard flips out) because it will be restored right away.

So the question is: how to distinguish whether onDestroy() is caused by say Back-key press or part of config change process?

after @CommonsWare's answer it would be pretty simple) something like:

@Override 
onDestroy() { 
  if (mIsChangeConfig == true) { 
    mIsChangeConfig = false: 
  } else { 
    stopService(); 
  } 
} 

@Override 
onRetainNonConfigurationInstance() { 
  mIsChangeConfig = true; 
}