title: Override onStop everywhere?
body: <p><strong>Intro:</strong>
  I have made a fadeout/fadein which fades out the opacity of all views. I want to animate this between switching activities. I now have to add the fadein/fadeout to every onStop/onResume in every activity.</p>
  
  <p><strong>Question:</strong> Is it possible to create a custom overridden onStop function and use that in every activity?</p>