android:layout_height=“?attr/actionBarSize” is not working with support:design:23.0.0' library

Question

If I set android:layout_height=\"56dp\", I can see the toolbar in graphical layout. But when I set like the below,

Answer 1

It was a problem in setting the theme.

Theme Values-v21.

 

when i selected the correct theme like here, it works fine for me!

Hope it helps.