setOnApplyWindowInsetsListener从未调用 [英] setOnApplyWindowInsetsListener never called

问题描述

我想计算NavigationBar的高度.我看过这个演示文稿: https://chris.banes.me/talks/2017/becoming-a-master-window-fitter-nyc/

I would like to calculate the navigationBar height. I've seen this presentation : https://chris.banes.me/talks/2017/becoming-a-master-window-fitter-nyc/

因此，我尝试使用方法 View.setOnApplyWindowInsetsListener().但是，由于某种原因，它从未被调用.

So, I tried to use the method View.setOnApplyWindowInsetsListener(). But, for some reason, it's never called.

有人知道为什么吗?有什么限制吗?

Does anyone knows why ? Any limitation there ?

我试图这样使用它:

navBarOverlay.setOnApplyWindowInsetsListener { v, insets -> 
   Timber.i("BOTTOM = ${insets.systemWindowInsetBottom}")
   return@setOnApplyWindowInsetsListener insets
}

请注意，我的根目录布局是 ConstraintLayout .

Note that my root layout is a ConstraintLayout.

推荐答案

我遇到了同样的问题.

如果您的根视图为ConstraintLayout且包含android:fitsSystemWindows ="true" attr，则该视图将消耗onApplyWindowInsets回调.因此，如果您在子视图上设置onApplyWindowInsets，则它们永远不会获得onApplyWindowInsets回调.

If your root view is ConstraintLayout and contains android:fitsSystemWindows="true" attr, the view consumed onApplyWindowInsets callbacks. So if you set onApplyWindowInsets on child views, they never get onApplyWindowInsets callbacks.

或者检查您的父视图是否使用了回调.

Or check your parent views consume the callback.

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