title: Get Selected Text from TextView
body: <p>I'm trying to get the text the user selected in a TextView,
  i wan't to use the <code>android:textIsSelectable="true"</code> to allow my user copy/paste actions</p>
  
  <p>However I don't have a clue as how to get the text once the action bar menu is displayed, the goal is to implement a Google book like behavior : you select a word and it gives you a definition.</p>