ch is
 less efficient. <a href="http://d.android.com/reference/android/graphics/drawable/Drawable.html?is-external=true" title="class or interface in android.graphics.drawable"><code>Drawable</code></a>s that implement <a href="http://d.android.com/reference/android/graphics/drawable/Animatable.html?is-external=true" title="class or interface in android.graphics.drawable"><code>Animatable</code></a>
 will fail with an exception. <a href="http://d.android.com/reference/android/graphics/drawable/Drawable.html