Android Material Design-CollapsingToolbarLayout折叠后如何更改工具栏的背景颜色 [英] Android Material Design - How to change background color of Toolbar after CollapsingToolbarLayout is collapsed

问题描述

用户向下滚动屏幕后， CollapsingToolbarLayout 中的图像消失，并留下带有后退按钮，内容标题和设置菜单的工具栏.我想知道如何仅在工具栏处于折叠"状态时更改其背景颜色.

After the user scrolls down the screen, the image in the CollapsingToolbarLayout disappears and is left with a toolbar with the back button, content title, and settings menu. I want to know how to change the background color of that toolbar only when its in a 'collapsed' state.

我所指的操作类似于工具栏背景颜色变为绿色的操作:

The action I am referring to is similar to this where the toolbar background color changes to green:

在CollapsingToolbarLayout下面，我有一个 NestedScrollView 和 CardViews

Below the CollapsingToolbarLayout I have a NestedScrollView with CardViews

推荐答案

我认为您是在app:contentScrim之后.

<android.support.design.widget.CollapsingToolbarLayout
    ...
    app:contentScrim="?attr/colorPrimary">
    <!-- Toolbar and ImageView here -->
</android.support.design.widget.CollapsingToolbarLayout>

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