title: How to define a circle shape in an Android XML drawable file?
body: <p>I have some problems finding the documentation of the definitions of shapes in XML for Android. I would like to define a simple circle filled with a solid color in an XML File to include it into my layout files. </p>
  
  <p>Sadly the Documentation on android.com does not cover the XML attributes of the Shape classes. I think I should use an <a href="https://developer.android.com/reference/android/graphics/drawable/shapes/ArcShape" rel="noreferrer">ArcShape</a> to draw a circle but there is no explanation on how to set the size, the color, or the angle needed to make a circle out of an Arc.</p>