LoadingView.java 文件源码

private void buildAnimator() {
    final ValueAnimator valueAnimator = ValueAnimator.ofFloat(0f, 1f).setDuration(ANIMATOR_DURATION);
    valueAnimator.setRepeatCount(-1);
    valueAnimator.setInterpolator(new LinearInterpolator());
    valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
        @Override
        public void onAnimationUpdate(ValueAnimator animation) {
            mRotation = (float) valueAnimator.getAnimatedValue();
            invalidate();
        }
    });
    animator = valueAnimator;
    animatorSet = buildFlexibleAnimation();
    animatorSet.addListener(animatorListener);
}