title: Custom attributes in styles.xml
body: <p>I have created a custom widget, and I'm declaring it in layout.xml.  I have also added some custom attributes in attr.xml.  However, when trying to declare these attributes in a style in styles.xml, it's giving me <code>No resource found that matches the given name: attr 'custom:attribute'.</code></p>
  
  <p>I have put the <code>xmlns:custom="http://schemas.android.com/apk/res/com.my.package"</code> in all of the tags in styles.xml, including <code>&lt;?xml&gt;</code>, <code>&lt;resources&gt;</code>, and <code>&lt;style&gt;</code>, but it still gives me the same error, that it can't find my custom XML namespace.</p>
  
  <p>I can, however, use my namespace to manually assign attributes to the view in my layout.xml, so there is nothing wrong with the namespace.  My issue lies in making styles.xml aware of my attr.xml.</p>