sprockets/src/main/java/net/sf/sprockets/transition/Transitions.java
public static Transition arcMotion(Context context) {
        if (sArc == null) {
            sArc = TransitionInflater.from(context).inflateTransition(
                    R.transition.sprockets_arc_motion);
        }
        return sArc;
    }
public static Transition arcMotion(Context context) {
        if (sArc == null) {
            sArc = TransitionInflater.from(context).inflateTransition(
                    R.transition.sprockets_arc_motion);
        }
        return sArc;
    }
Get a cached arc motion transition.