title: How to set global application background color?
body: <p>I know that I can assign background color to individual views in <code>layout.xml</code> files. The bg color of a root layout of, say, <code>Activity</code> is effectively the background color of this activity. But is there a way to set this color globally to the whole application so that all activities and fragments get it automatically? I'm using the <code>Theme.AppCompat</code> theme.</p>
  
  <p>Or am I not supposed to alter the default grey color at all?</p>