title: How to implement WhatsApp like material design SearchView?
body: <p>WhatsApp has such Toolbar:
  <a href="https://i.stack.imgur.com/waxng.png" rel="noreferrer"><img src="https://i.stack.imgur.com/waxng.png" alt="enter image description here"></a></p>
  
  <p>When 'Search' menu item clicked, from the top SearchView comes down which takes whole space of toolbar:
  <a href="https://i.stack.imgur.com/6zIqr.png" rel="noreferrer"><img src="https://i.stack.imgur.com/6zIqr.png" alt="enter image description here"></a></p>
  
  <p>When I tried to implement SearchView, it looks like this:
  <a href="https://i.stack.imgur.com/7Qswj.png" rel="noreferrer"><img src="https://i.stack.imgur.com/7Qswj.png" alt="enter image description here"></a></p>
  
  <p>I found some libraries to implement this:
  <a href="https://github.com/EugeneHoran/Android-Material-SearchView" rel="noreferrer">Android Material SearchView by Eugene Horan</a>
  and <a href="https://github.com/krishnakapil/MaterialSeachView" rel="noreferrer">MaterialSearchView by krishnakapil</a>. But they are not like in WhatsApp.</p>
  
  <p>This question may seem weird, I could not find the way how to do this. So my question is how to implement WhatsApp like material design SearchView which comes from the top?</p>