title: Android imagebutton not change color when state pressed
body: <p>I have in my layout a button, which is has to change image when pressed. I Have a selector xml. Here is button:</p>
  
  <pre><code>&lt;ImageButton
              android:id="@+id/cwcfwdvcs"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:layout_alignParentRight="true"
              android:clickable="true"
              android:layout_marginTop="16dp"
              android:background="@drawable/button_add_to_favorites_unactive"
              android:drawable="@drawable/add_to_favorites"
              android:text="Favotites"/&gt;
  </code></pre>
  
  <p>Here is selector add_to_favorites.xml: </p>
  
  <pre><code>&lt;animation-list xmlns:android="http://schemas.android.com/apk/res/android" &gt;
  &lt;item android:drawable="@drawable/button_add_to_favorites_active"
        android:state_checked="true" /&gt;
  &lt;item android:drawable="@drawable/button_add_to_favorites_unactive" /&gt;
  </code></pre>
  
  <p></p>