Android AppBar not showing shadow

Question

The AppBar and BottomNavigationView don't display any shadow on the listview between them even with

setSupportActionBar().setElevation(3.0f);

I have the following layout

CordinatorLayout
--LinearLayout

----AppBarLayout
-----------Toolbar
----/AppBarLayout

----FrameLayout
-----------ListView
----/FrameLayout

----BottomNavigationView

--/LinearLayout
/CordinatorLayout

what are the other possibilities the shadow isn't drawn

Edit,

---------------------------------------------------------------------------------------------------------

older devices like Galaxy s3 running Android 4.4.2 still doesn't show any shadow, even with hardware acceleration enabled

Answer 1

So the issue wasn't related to toolbar elevation, view clipping or incorrect layouts, the manifest entry for this particular activity had hardware acceleration turned off.

<activity
..
..
..
android:hardwareAccelerated="false"/>

changing this to true fixed it