code: private void initializeSweepAnimator() {
          sweepAnimator = ObjectAnimator
                  .ofFloat(this, createSweepProperty(), MAX_DEGREES - MIN_SWEEP_ANGLE * 2);
          sweepAnimator.setInterpolator(new DecelerateInterpolator());
          sweepAnimator.setDuration(SWEEP_ANIMATION_DURATION);
          sweepAnimator.setRepeatMode(ValueAnimator.RESTART);
          sweepAnimator.setRepeatCount(ValueAnimator.INFINITE);
          sweepAnimator.addListener(createSweepAnimatorListener());
      }
docs: Initializes the sweep animator.