title: Android overflow button overlay / always visible
body: <p>I'm trying to get a button to be always on top (just when the application is active, not like the facebook messenger one).</p>
  
  <p>How do I accomplish that?</p>
  
  <p>Since i have a main activity, which switches out the fragments, I can't create the button in the fragments, and it seems that I can't initialise a button in the main activity that will be on top of those fragments.</p>