title: android dashed border with padding
body: <p>i have a RadioGroup <img src="https://i.stack.imgur.com/yPMoS.png" alt="RadioGroup">
  I would like to add a dashed stroke(boder?) with some padding.</p>
  
  <p>The background of Radio Buton is </p>
  
  <pre><code>&lt;layer-list xmlns:android="http://schemas.android.com/apk/res/android"&gt;
      &lt;item android:drawable="@drawable/navigation"/&gt;
      &lt;item &gt;
          &lt;shape&gt;
              &lt;solid android:color="#00000000"/&gt;
              &lt;stroke android:color="#ffffff"
                      android:dashGap="5dp"
                      android:dashWidth="5dp"/&gt;
          &lt;/shape&gt;
      &lt;/item&gt;
  &lt;/layer-list&gt;
  </code></pre>
  
  <p>The second item - is my attemp to draw dashed line.</p>
  
  <p>What am i doing wrong?</p>