title: App logo on Action Bar in Android Studio is not showing
body: <p>Android Studio is not showing app logo on the Action Bar.</p>
  
  <p>I used following style:</p>
  
  <pre><code>&lt;style name="AppTheme" parent="Base.Theme.AppCompat.Light.DarkActionBar"&gt;
      &lt;!-- Customize your theme here. --&gt;
  &lt;/style&gt;
  </code></pre>
  
  <p>It is showing logo in my XMl design what While i run it app logo disappear.</p>
  
  <p>Like this is the output of my app</p>
  
  <p><img src="https://i.stack.imgur.com/vcdwT.png" alt="enter image description here"></p>