title: Background drawable not applying to button
body: <p>I am trying to create a capsule/pill shaped button in XML.  I have defined a drawable and set it as the background of my button, but in the preview, and when I run the app, it's displaying as a blue rectangle, despite the background drawable being a white oval.  Does anyone know why that might be happening?</p>
  
  <p>Here's the button:</p>
  
  <pre><code>&lt;Button
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:layout_below="@+id/search_box"
              android:layout_centerHorizontal="true"
              android:layout_marginTop="24dp"
              android:background="@drawable/button_capsule"
              android:text="@string/search"
              android:textColor="@color/precipLightBlue"/&gt;
  </code></pre>
  
  <p>And here's the background drawable:</p>
  
  <pre><code>&lt;shape xmlns:android="http://schemas.android.com/apk/res/android"&gt;
  
      &lt;corners android:radius="1000dp" /&gt;
  
      &lt;solid android:color="@android:color/white" /&gt;
  
  &lt;/shape&gt;
  </code></pre>