title: Android - how can i make a minimizable app?
body: <p>So , i want to make an app that can i can minimize and move over other apps. 
  I saw this feature on the twitch app and did some research but didn't find how they did it.<a href="https://i.stack.imgur.com/O4vzj.jpg" rel="nofollow noreferrer">here is an example of this feature</a>.
  Thank you for your answers in advance.</p>