title: Android - objectAnimator xml alpha animation not working
body: <p>Using <code>alpha</code> as the <code>propertyName</code> of the <code>objectAnimator</code> does nothing at all. The <code>objectAnimator</code> is connected to a <code>path</code> inside the <code>vector</code>.</p>
  
  <p>fading_animator.xml:</p>
  
  <pre><code>&lt;set xmlns:android="http://schemas.android.com/apk/res/android"&gt;
      &lt;objectAnimator
          android:duration="700"
          android:propertyName="alpha"
          android:valueFrom="1"
          android:valueTo="0"
          android:valueType="floatType"
          android:repeatCount="infinite"
          android:repeatMode="restart"/&gt;
  &lt;/set&gt;
  </code></pre>
  
  <p>animated_vector.xml:</p>
  
  <pre><code>&lt;animated-vector
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:drawable="@drawable/vector_drawable"&gt;
  
    &lt;target
      android:name="pathTarget"
      android:animation="@animator/fading_animator"/&gt;
  
  &lt;/animated-vector&gt;
  </code></pre>