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com.android.support包中支持库中的BottomAppBar小部件具有isFabAttached标志和方法。在28.0.0-alpha1版本中，它具有公共访问权限。但在稳定版本28.0.0发布后，它不再可用。

我用于bottomAppBar.isFabAttached = false动画分离和bottomAppBar.isFabAttached = true垂直附加动画。但是在更新到 com.android.support:design:28.0.0 后isFabAttached具有私有访问权限，因此动画不起作用。目前只有水平动画可用。

如何为最后一个版本的com.android.support:design:28.0.0库制作这张图片上的 fab 按钮动画？

在此处输入图像描述

更新：问题解决了，我从 BottomAppBar 复制了代码并创建了一个自定义视图：android.support.design.bottomappbar包中的CustomBottomAppBar并添加了下一个代码：

public void setFabAttached(boolean attached) {
    maybeAnimateAttachChange(attached);
    maybeAnimateMenuView(fabAlignmentMode, attached);
    this.fabAttached = attached;
}

private void maybeAnimateAttachChange(boolean targetAttached) {
    if (fabAttached == targetAttached || !ViewCompat.isLaidOut(this)) {
        return;
    }

    if (attachAnimator != null) {
        attachAnimator.cancel();
    }

    List<Animator> animators = new ArrayList<>();

    createCradleShapeAnimation(targetAttached, animators);
    createFabTranslationYAnimation(targetAttached, animators);

    AnimatorSet set = new AnimatorSet();
    set.playTogether(animators);
    attachAnimator = set;
    attachAnimator.addListener(
            new AnimatorListenerAdapter() {
                @Override
                public void onAnimationEnd(Animator animation) {
                    attachAnimator = null;
                }
            });
    attachAnimator.start();
}
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