title: How to add "UP" back button in fragment (Fragment to Activity)
body: <p>I want to go from fragment to activity using back button using toolbar back icon.</p>
  
  <p><img src="https://i.stack.imgur.com/ad1gQ.png" alt="like this one"></p>
  
  <p>The fragment is my navigation drawer item &amp; activity is my MainActivity.</p>
  
  <p>How do I do it?</p>