title: How make an view over other app like musixmatch ? android
body: <p>I want to make a view that can drag, drop, resize, expand, collapse and display over other app that like Musixmatch. Streenshot:</p>
  
  <p><img src="https://i.stack.imgur.com/QqDXV.jpg" alt="enter image description here"></p>
  
  <p>have any idea?</p>