title: How to create a bottom comment widget in Flutter?
body: <p>I would like to build a comment widget floating at the bottom of screen. when user tap the input box, a key board pop-up.</p>
  <p>Here is the problem. I tried to add a Container inside of a BottomNavigationBar. But when I tap the input box, key board pop-up and covered the entire BottomNavigationBar. SO I have no way to see what I just tapped in the input box.</p>
  <p>Here are 2 images to show you the comment widget box I would like to build. And the key point is I don't want keyboard cover the comment widget.</p>
  <p>Please help me.</p>
  <p><a href="https://i.stack.imgur.com/j0RRx.jpg" rel="nofollow noreferrer">close key board</a></p>
  <p><a href="https://i.stack.imgur.com/TXOUG.jpg" rel="nofollow noreferrer">open key board</a></p>