title: How to make Activity blurry when it goes background?
body: <p>I couldn't find anything about this kind of feature online. So basically what I'm trying to achieve is when the user clicks <code>Home</code> button (in other words <code>onPause()</code> method called) I want to make the <code>activity</code> invisible or blurry on back stack for maximum security.</p>
  
  <p><a href="https://i.stack.imgur.com/DivAl.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/DivAl.jpg" alt="here is what I meant"></a></p>
  
  <p>I want this for not just one activity but every activity, what's the easiest way to achieve this?</p>