MaterialComponents, CoordinatorLayout, AppBarLayout, Toolbar and automatic elevation Spike

Here's an example of how to use themes to get automatic Toolbar elevation without extra code or custom listeners.

Use AppBarLayout from MaterialComponents for it.

How to

1. Your app style should use a MaterialCompoment style, like src/main/res/values/styles.xml.

2. Setup you AppBarLayout:

   • Use any MaterialCompoments style for this component like: Widget.MaterialComponents.AppBarLayout.Surface.
   • Set app:liftOnScroll="true" to enable the automatic elevation based on scroll.

3. Setup your scrolling view:

   • Set app:layout_behavior="@string/appbar_scrolling_view_behavior.

And that's all :)

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