title: What is WindowManager in android?
body: <p>I tried googling it and there is no direct and/or clear cut answer.</p>
  
  <p>The <a href="https://developer.android.com/reference/android/view/WindowManager.html" rel="noreferrer">developer website</a>'s definition is not clear either:</p>
  
  <blockquote>
    <p>The interface that apps use to talk to the window manager. Use
    <code>Context.getSystemService(Context.WINDOW_SERVICE)</code> to get one of these.</p>
  </blockquote>
  
  <p>Can someone with plain 6th grade English explain what it is?</p>
  
  <p>And how can I use it to create a floating object that remains via several activties, even though I moved from one to the other?</p>