title: XML Color for area outside rectangle's curved edges
body: <p>I am making a rectangle for the background of a RelativeLayout and was wondering how I could make the area outside of the rounded edges of this rectangle to also be darker_grey.  Currently, only the inside of this rectangle is darker_grey</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle" &gt;
      &lt;solid android:color="@android:color/darker_gray" /&gt;
      &lt;stroke android:width="1dip" android:color="@android:color/black"/&gt;
      &lt;corners android:radius="20dp" /&gt;
  &lt;/shape&gt;
  </code></pre>