title: Circle shape height and width issues in xml
body: <p>I created an Oval Shape and set the sizes 56px for each height and width. but i had an Oval Shape not a circle! when i set the sizes to 78px for each i get an exact circle! Anyone noticed or faced this issue? 
  Solutions please!</p>
  
  <p>clear_test.xml this gives me an Oval shape! different Height and Width in the layout</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;shape xmlns:android="http://schemas.android.com/apk/res/android"
      android:shape="oval"&gt;
      &lt;solid android:color="#7caf00"/&gt;
      &lt;size android:width="56px"
          android:height="56px"/&gt;
  
  &lt;/shape&gt;
  </code></pre>
  
  <p>calc_test.xml But this gives an exact circle</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;shape xmlns:android="http://schemas.android.com/apk/res/android"
      android:shape="oval"&gt;
      &lt;solid android:color="#7caf00"/&gt;
      &lt;size android:width="78px"
          android:height="78px"/&gt;
  
  
  
  &lt;/shape&gt;
  </code></pre>