[BottomAppBar] BottomAppBar casts a shadow

https://github.com/material-components/material-components-android/issues/2698…

Description: BottomAppBar (https://m3.material.io/components/bottom-app-bar/overview):

• Elevation: No shadow
• M3: Bottom app bar has new colors, a taller container, no elevation or shadow, and contains the FAB.

But, the BottomAppBar casts a shadow (https://github.com/material-components/material-components-android/issues/2852). The MaterialToolbar casts no drop shadow (https://github.com/material-components/material-components-android/issues/2698#issuecomment-1233742799). https://m3.material.io/components/top-app-bar/overview https://github.com/material-components/material-components/issues/108

Expected behavior: The BottomAppBar casts no shadow. Or revise the documentation.

Source code:

<androidx.coordinatorlayout.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <com.google.android.material.bottomappbar.BottomAppBar
        android:id="@+id/appBar"
        android:layout_width="match_parent"
        android:layout_height="?actionBarSize"
        android:layout_gravity="bottom" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>

Minimal sample app repro: Test1.zip (https://github.com/material-components/material-components-android/issues/2852)

Android API version: 33

Material Library version: 1.7.0-rc01

Device: Emulator 31.3.10

[imhappi]

Hi! Sorry, I was out last week

Yes, the designer has confirmed that although there is elevation, there should be no shadow. Changes for this will go out soon

[manabu-nakamura]

Thank you, @patzly. This method can also be used for the navigation bar (BottomNavigationView). https://m3.material.io/components/navigation-bar/overview

My method can not be used for the navigation bar:

((MaterialShapeDrawable)binding.appBar.getBackground()).setShadowCompatibilityMode(MaterialShapeDrawable.SHADOW_COMPAT_MODE_NEVER);

https://github.com/material-components/material-components-android/blob/master/lib/java/com/google/android/material/bottomappbar/BottomAppBar.java#L355:

materialShapeDrawable.setShadowCompatibilityMode(SHADOW_COMPAT_MODE_ALWAYS);