@Override
          public void onAnimationUpdate(ValueAnimator valueAnimator) {
            calculateInterpolation(getWorkingTransform(), (float) valueAnimator.getAnimatedValue());
            AnimatedZoomableController.super.setTransform(getWorkingTransform());
          }
ZoomableController that adds animation capabilities to DefaultZoomableController using standard
Android animation classes
samples/zoomable/src/main/java/com/facebook/samples/zoomable/AnimatedZoomableController.java