OpacityAnimation.java 文件源码

private void initAuraAnimators(final int index, ValueAnimator opacityAnimator) {
    opacityAnimator.setRepeatMode(ValueAnimator.REVERSE);
    final float opacityDecelerateFactor = 1.f + 0.8f * (index + 1);
    opacityAnimator.setInterpolator(new AnticipateInterpolator(opacityDecelerateFactor));
    opacityAnimator.setIntValues(255, 50, 255, 50);
    opacityAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
        @Override
        public void onAnimationUpdate(ValueAnimator animation) {
            final int opacity = (int) animation.getAnimatedValue();
            mAlphaOpacityList.set(index, opacity);
        }
    });
}