title: How to setup night mode drawables to work as expected
body: <p>I what to change background as night mode changes.</p>
  
  <p>I have /values and /values-night folder, that contain "colors.xml" with different values.
  `
  </p>
  
  <pre><code>&lt;color name="grey1"&gt;#ebebeb&lt;/color&gt;
  &lt;color name="grey2"&gt;#c7c7c7&lt;/color&gt;
  &lt;color name="grey3"&gt;#999999&lt;/color&gt;
  &lt;color name="hover1"&gt;#8bb065&lt;/color&gt;
  &lt;color name="red1"&gt;#ba0000&lt;/color&gt;
  &lt;color name="red2"&gt;#ff0000&lt;/color&gt;
  &lt;color name="green1"&gt;#336600&lt;/color&gt;
  &lt;color name="text1"&gt;#000000&lt;/color&gt;
  </code></pre>
  
  <p></p>
  
  <p>and other is</p>
  
  <p>
  </p>
  
  <pre><code>&lt;color name="grey1"&gt;#999999&lt;/color&gt;
  &lt;color name="grey2"&gt;#333333&lt;/color&gt;
  &lt;color name="grey3"&gt;#000000&lt;/color&gt;
  &lt;color name="hover1"&gt;#8bb065&lt;/color&gt;
  &lt;color name="red1"&gt;#ba0000&lt;/color&gt;
  &lt;color name="red2"&gt;#ff0000&lt;/color&gt;
  &lt;color name="green1"&gt;#336600&lt;/color&gt;
  &lt;color name="text1"&gt;#ffffff&lt;/color&gt;
  </code></pre>
  
  <p></p>
  
  <p>these colors are used in layer list for background "activity_main_bg2.xml":</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;layer-list xmlns:android="http://schemas.android.com/apk/res/android" &gt;
      &lt;item&gt;
          &lt;shape android:shape="rectangle" &gt;
              &lt;solid android:color="@color/grey1" /&gt;
          &lt;/shape&gt;
      &lt;/item&gt;
      &lt;item
          android:bottom="1dp"
          android:left="1dp"
          android:right="1dp"&gt;
          &lt;shape android:shape="rectangle" &gt;
              &lt;solid android:color="@color/grey2" /&gt;
          &lt;/shape&gt;
       &lt;/item&gt;
  &lt;/layer-list&gt;
  </code></pre>
  
  <p>My activity contains fragment:</p>
  
  <p></p>
  
  <pre><code>&lt;TextView
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="@string/hello_world_dark"
      android:background="@drawable/activity_main_bg2" /&gt;
  </code></pre>
  
  <p></p>
  
  <p>When I change time from day-night or back colors in background does not change. But if I use</p>
  
  <pre><code>android:background="@color/grey1"
  </code></pre>
  
  <p>everythings works ok. </p>
  
  <p>How to solve this? Is this android bug?</p>