title: How to center a drawable in a button?
body: <p>I want to put an image(Drawable) into a button. But the opcions are drawableLeft/Bottom/Top/Rigth. I want to put it in center.
  Background dont work because it stretched my image.
  The image is an drawable into drawable folder.
  If it possible the code in xml.
  Thanks!</p>
  
  <p>The drawable:</p>
  
  <pre><code>    &lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;layer-list xmlns:android="http://schemas.android.com/apk/res/android"&gt;
      &lt;item
          android:drawable="@drawable/im_perfil"
          android:bottom="20dp"
          android:left="20dp"
          android:right="20dp"
          android:top="20dp"/&gt;
  &lt;/layer-list&gt;
  </code></pre>
  
  <p>"im_perfil" is an ImageAsset,</p>
  
  <p><strong>I CAN! I use src!</strong></p>