title: Android setBackgroundTintList on pre-lollipop devices
body: <p>I'm working with <code>FloatingActionButton</code>.
  The user should be able to switch the FAB background color within a <code>onClick</code> Event.</p>
  
  <p>However, the recommended call to <code>setBackgroundTintList</code> seems to be only compatible from 21+ API.</p>
  
  <p>How do I - correctly - go about it on pre-lollipop devices? Is there any alternative I could use?</p>
  
  <p>Thanks in advance.</p>