title: How to change shape colors in Drawable?
body: <p>I have the following button:</p>
  
  <pre><code>&lt;Button
      android:id="@+id/Button_Collect"
      android:layout_width="48dp"
      android:layout_height="48dp"
      android:layout_marginBottom="16dp"
      android:layout_gravity="center_horizontal"
      android:background="@drawable/CollectButtonShape" /&gt;
  </code></pre>
  
  <p>which looks like this:</p>
  
  <p><img src="https://i.stack.imgur.com/bVpTT.png" alt="enter image description here"></p>
  
  <p>which consists of the following background 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&gt;
    &lt;shape android:innerRadius="0dp" android:shape="ring" android:thicknessRatio="2" android:useLevel="false" &gt;
      &lt;solid android:color="@android:color/transparent" /&gt;
  
      &lt;stroke
          android:width="2dp"
          android:color="#FF27AE60" /&gt;
    &lt;/shape&gt;
  &lt;/item&gt;
  &lt;item android:top="10dp" android:left="10dp" android:right="10dp" android:bottom="10dp"&gt;
      &lt;shape android:shape="oval"&gt;
          &lt;solid android:color="#FF27AE60" /&gt;
      &lt;/shape&gt;
  &lt;/item&gt;
  &lt;/layer-list&gt;
  </code></pre>
  
  <p>How do I programmatically change the colors of the ring and inner circle (I need to do this on the the Touch  event)???</p>