title: How can I get current theme's action bar background color?
body: <p>I was trying to make my navigation drawer's background always match with the action bar's background color.</p>
  
  <p>So that, every time, if the theme changes both background will change automatically.</p>
  
  <p>I looked into <a href="http://developer.android.com/reference/android/R.attr.html" rel="noreferrer">R.attr</a>, but didn't find anything.</p>