在运行时在FloatingActionButton上设置layout_anchor [英] Set layout_anchor at runtime on FloatingActionButton

问题描述

我正在尝试为固定在AppBarLayout上的android.support.design.widget.FloatingActionButton设置动画。我可以在布局xml中将其设置为正确，并且显示良好。但是，我正在向此布局进行共享元素转换，并且在设置视图之前显示了FAB。我试图将可见性设置为GONE和INVISIBLE，但是如果在layout xml中设置了layout_anchor，它们似乎将被忽略。

I am trying to animate a android.support.design.widget.FloatingActionButton that is pinned to my AppBarLayout. I can set it fine within the layout xml and it shows up fine. However i am doing a Shared Element Transition to this layout and the FAB is showing up before the view is set. I tried to set the visibility to GONE and INVISIBLE but they seem to be disregarded if the layout_anchor is set in the layout xml. Is there anyway around this?

我希望该活动加载共享元素过渡，然后在我的FAB中淡出。我只是无法隐藏加载中的FAB。我可以在不使用layout_anchor的情况下做到这一点，但是如果可能的话，最好保留它。

I would like the activity to load with the shared element transition then fade in my FAB. I just can't hide the FAB on load. I could do it without using the layout_anchor but prefer to keep that if possible.

推荐答案

如果您的FAB带有 app：layout_anchor 属性，并且要设置可见性，应使用类似以下内容的东西：

If you have a FAB with the the app:layout_anchor attribute, and you want to set the visibility you should use something like this:

CoordinatorLayout.LayoutParams params = (CoordinatorLayout.LayoutParams) fab.getLayoutParams();
params.setAnchorId(View.NO_ID);
fab.setLayoutParams(params);
fab.setVisibility(View.GONE);

如果要设置 app：layout_anchor 可以使用相同的代码

If you want to set theapp:layout_anchor dinamically you can use the same code:

CoordinatorLayout.LayoutParams p = (CoordinatorLayout.LayoutParams) fab.getLayoutParams();
p.setAnchorId(xxxx);
fab.setLayoutParams(p);

这篇关于在运行时在FloatingActionButton上设置layout_anchor的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！