@Override
    public void onAnimationUpdate(final ValueAnimator animation) {
        //noinspection ConstantConditions
        final float value = (Float) animation.getAnimatedValue();

        if (animation == mCheckmarkScaleAnimator) {
            mCheckMarkDrawable.setScaleAnimatorValue(value);
        } else if (animation == mCheckmarkAlphaAnimator) {
            mCheckMarkDrawable.setAlphaAnimatorValue(value);
        }
    }
Must be <= 1f since the animation value is used as a percentage.
android/modules/module_common/src/main/java/github/tornaco/android/thanos/widget/checkable/CheckableFlipDrawable.java