title: windowBackground in Android 6 (Marshmallow)
body: <p>I have defined a base style for my application with the following element:</p>
  
  <pre><code>&lt;item name="android:windowBackground"&gt;@color/window_background&lt;/item&gt;
  </code></pre>
  
  <p>Which has set the background color for all my activities fine until I tested my app on Android 6 where all backgrounds are white. The backgrounds are still color/window_background on devices running pre-marshmallow. </p>
  
  <p>Anyone know how to make this work (or why it is not working) on Android 6?</p>
  
  <p>Edit with some more info:
  I am targeting API 22, I have not changed anything from previous version or upgraded the API, just running on Android 6 changes the background.</p>