How to change direction of android elevation shadow?

Question

I have FrameLayout with android:elevation="4dp". Shadow of this elevation directed down. I want change direction of shadow to up.

<FrameLayout     android:id="@+id/container"     android:layout_width="match_parent"     android:layout_height="100dp"     android:elevation="10dp"     android:layout_marginBottom="100dp"     android:background="@color/ColorPrimary"     android:layout_alignParentBottom="true"     android:layout_alignParentLeft="true"     android:layout_alignParentStart="true"> </FrameLayout> 

Answer 1

I consider this method is the best solution: Android Bottom Navigation Bar with drop shadow Thanks, Alexander Bilchuk.

Solution:

You can draw your own shadow just above the view using simple View and its background:

<View     android:layout_width="match_parent"     android:layout_height="4dp"     android:layout_above="@id/bottom_bar"     android:background="@drawable/shadow"/> 

drawable/shadow.xml:

<shape xmlns:android="http://schemas.android.com/apk/res/android">     <gradient         android:startColor="#1F000000"         android:endColor="@android:color/transparent"         android:angle="90" /> </shape> 

Also, there are no compatibility issues if use this approach.