title: Changing Application title during tab change
body: <p>I am following this <a href="http://www.androidhive.info/2015/09/android-material-design-working-with-tabs/" rel="nofollow">tutorial</a> in order to set up some tabbed activities. All is going fine until I try change the main app title at the top of the screen. What I want to happen is change the title to reflect the title of the open tab.</p>
  
  <p>I am quite new to fragments so this is causing some trouble. I am able to change the title for the activities but when ever I try change the fragments it sets the title the same for all tabs and not individually.</p>
  
  <p>From my understanding the fragments are launched from the main activity and replace the current view, i just can seem to figure out where the tutorial is changing the title per fragment  </p>