code: public void setEnabled(boolean enable, GVRContext gvrContext) {
          if (this.enabled != enabled ) {
              // a change in the animation stopping / starting
              for (GVRNodeAnimation gvrKeyFrameAnimation : gvrKeyFrameAnimations) {
                  if (enable) gvrKeyFrameAnimation.start(gvrContext.getAnimationEngine());
                  else {
                      gvrKeyFrameAnimation.setRepeatMode(GVRRepeatMode.ONCE);
                  }
              }
              this.enabled = enable;
          }
      }
docs: setEnabled will set the TimeSensor enable variable.
  if true, then it will started the animation
  if fase, then it changes repeat mode to ONCE so the animation will conclude.
  There is no simple stop() animation
  @param enable
  @param gvrContext