As posted in https://stackoverflow.com/a/30931750, for Prelollipop, we could have shadow (elevation) for our button by setting the following.
android:background="@android:drawable/dialog_holo_light_frame"
However, if I need to add another color to my button background, how could I achieve that?
(Additional question, is there a way to control the elevation (depth of shadow) using this appraoch?)