title: Android unbounded ripple and background
body: <p>it is possible to create a RippleDrawable defining an unbounded ripple and at the same time a background color?
  I've tried everything but when i define a shape and its color the ripple is not unbounded anymore.
  Also in this page <a href="https://developer.android.com/reference/android/graphics/drawable/RippleDrawable.html" rel="noreferrer">https://developer.android.com/reference/android/graphics/drawable/RippleDrawable.html</a> there is no reference about adding an unbounded ripple over a shape.</p>
  
  <p>I've tried with this layer-list but the result is awful</p>
  
  <pre><code>    &lt;layer-list 
          xmlns:android="http://schemas.android.com/apk/res/android"&gt;
  &lt;item&gt;
      &lt;ripple
          android:color="@color/android_l_light_gray"&gt;
      &lt;/ripple&gt;
  &lt;/item&gt;
  
  &lt;item&gt;      
      &lt;shape
          android:shape="rectangle"&gt;
          &lt;solid android:color="@color/android_l_dark_gray" /&gt;
      &lt;/shape&gt;    
  &lt;/item&gt; &lt;/layer-list&gt;
  </code></pre>
  
  <p>this is what i get <img src="https://i.stack.imgur.com/lBbtd.png" alt="enter image description here"></p>