title: Circular gradient in android
body: <p>I'm trying to make a gradient that emits from the middle of the screen in white, and turns to black as it moves toward the edges of the screen.</p>
  
  <p>As I make a "normal" gradient like this, I have been experimenting with different shapes:</p>
  
  <pre><code>&lt;shape xmlns:android="http://schemas.android.com/apk/res/android"
      android:shape="rectangle"&gt;
      &lt;gradient android:startColor="#E9E9E9" android:endColor="#D4D4D4"
          android:angle="270"/&gt;
  &lt;/shape&gt;
  </code></pre>
  
  <p>When using the "oval"-shape I at least got a round shape, but there were no gradient effect. How can I achieve this?'</p>