以编程方式在CoordinatorLayout中展开/折叠底部导航视图 [英] Programmatically expand/collapse Bottom Navigation View in CoordinatorLayout

问题描述

我有一个CoordinatorLayout，其中包含一个BottomNavigationView和一个AppBarLayout，其中包含一个ToolBar. (BottomNavigationView不在AppBarLayout内，因为这样做会破坏BottomNavigationView的位置.)

I have a CoordinatorLayout that contains a BottomNavigationView and an AppBarLayout with a ToolBar inside of it. (The BottomNavigationView is not inside the AppBarLayout, as doing it breaks the position of the BottomNavigationView).

当某些事件发生时(例如在片段的onResume上)，我需要以编程方式显示/隐藏AppBarLayout和BottomNavigationView，到目前为止，我已经管理了设置appBarLayout.setExpanded(true, true)以便显示/隐藏AppBar，但是我不知道如何为BottomNavigationView做同样的事情，因为它没有任何显示/隐藏自身的方法.

I need to show/hide the AppBarLayout and the BottomNavigationView programmatically, when certain events happen (e.g. on a fragment's onResume), and so far I've managed setting appBarLayout.setExpanded(true, true) in order to show/hide the AppBar, but I can't figure out how to do the same for the BottomNavigationView, as it does not have any method to show/hide itself.

我的BottomNavigationView的行为是app:layout_behavior="@string/hide_bottom_view_on_scroll_behavior"，在布局xml中设置.如何在我的代码中引用此行为以管理其扩展/折叠状态?

The behaviour of my BottomNavigationView is app:layout_behavior="@string/hide_bottom_view_on_scroll_behavior", set in the layout xml. How can I get a reference to this behaviour in my code in order to manage its expanded/collapsed state?

推荐答案

那是代码将您的底部导航向上滑动到协调器布局内，并具有HideBottomViewOnScrollBehavior.

Thats code slides up your bottom navigation that are inside of a Coordinator Layout and have a HideBottomViewOnScrollBehavior.

如果您使用的是findViewById，只需将其替换为每个binding.

If you are using findViewById just replace that for every binding.

val layoutParams = binding.bottomNavigation.layoutParams as CoordinatorLayout.LayoutParams
val bottomViewNavigationBehavior = layoutParams.behavior as HideBottomViewOnScrollBehavior
bottomViewNavigationBehavior.slideUp(binding.bottomNavigation)

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