Elevation on Android Lollipop not working

Question

I am trying to make use of the elevation property in the latest Android Lollipop preview release. I set the targetSdk to 21 and the theme to Material. Next i added a background shape to a TextView and set the elevation to 8dp but the TextView is not showing any signs of a shadow. That is on a Nexus7 running the Lollipop preview. Is there anything else i have to consider?

Here is the layout:

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"           android:layout_width="match_parent"           android:layout_height="match_parent">    <TextView       android:layout_width="wrap_content"       android:layout_height="wrap_content"       android:background="@drawable/rect"       android:text="hallo world"       android:padding="8dp"       android:elevation="8dp" />  </LinearLayout> 

This is the background drawable:

<?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android"      android:shape="rectangle">     <solid android:color="#7d0073ff" />     <corners android:radius="16dp" /> </shape> 

Here is the TextView:

Answer 1

For some reason if you set a solid color with a transparency, the elevation shadow does not show up.

In your example, I changed #7d0073ff to #0073ff and I got a shadow.

This is probably a bug, as in their documentation it gives a similar example using a translucent background color.