title: Set border color for FloatingActionButton in support library
body: <p>In support library <a href="https://developer.android.com/reference/android/support/design/widget/FloatingActionButton.html" rel="noreferrer">FloatingActionButton</a> is introduced. There is an option to set border width for button with <code>app:borderWidth="2dp"</code>, but how about setting border color?</p>
  
  <p>I create a custom drawable for that porpuse, such as:</p>
  
  <pre><code>&lt;item&gt;
       &lt;shape android:shape="oval"&gt;
           &lt;solid android:color="@color/color1" /&gt;
           &lt;stroke android:width="2dp" android:color="@android:color/white" /&gt;
       &lt;/shape&gt;
  &lt;/item&gt;
  </code></pre>
  
  <p>and try both <code>android:background</code> and <code>app:backgroundTint</code> properties of FloatingActionButton to set background. Non of them worked. Note that app:backgroundTint seems just to accept color and not drawable</p>
  
  <p>Anyone know any workaround?</p>