为什么动画会影响idleHandler？

Question

此代码运行后将不执行idleHandler：

if (operatingAnim == null) {
    operatingAnim = AnimationUtils.loadAnimation(BocaiApplication.getInstance(), R.anim.rotate);
    operatingAnim.setInterpolator(new LinearInterpolator());
}
iv.clearAnimation();
iv.startAnimation(operatingAnim);