title: ActionBar background with MaterialComponents theme
body: <p>I want to customize my ActionBar. My Theme looks as below:</p>
  
  <pre><code>&lt;style name="AppTheme" parent="Theme.MaterialComponents.DayNight"&gt;
      &lt;item name="actionBarStyle"&gt;@style/MyActionBar&lt;/item&gt;
  &lt;/style&gt;
  
  &lt;style name="MyActionBar" parent="@style/ThemeOverlay.MaterialComponents.ActionBar"&gt;
      &lt;item name="background"&gt;@drawable/actionBarBackground&lt;/item&gt;
  &lt;/style&gt;
  </code></pre>
  
  <p>In values folder:</p>
  
  <pre><code>&lt;drawable name="actionBarBackground"&gt;#FFFFFFFF&lt;/drawable&gt;
  </code></pre>
  
  <p>In values-night folder:</p>
  
  <pre><code>&lt;drawable name="actionBarBackground"&gt;#FF000000&lt;/drawable&gt;
  </code></pre>
  
  <p>Not sure why my ActionBar background colour doesn't change accordingly. I have tried to change my theme in different other ways as well but nothing works. Here are my other tries:</p>
  
  <p>Instead of <code>actionBarStyle</code>, I used <code>actionBarTheme</code>.</p>
  
  <pre><code>&lt;item name="actionBarTheme"&gt;@style/MyActionBar&lt;/item&gt;
  </code></pre>
  
  <p>I also tried using <code>colorPrimary</code>.</p>
  
  <pre><code>&lt;item name="colorPrimary"&gt;@color/actionBarBackground&lt;/item&gt;
  </code></pre>
  
  <p>Am I missing something?</p>