Layout Layers? Z-Axis?

Question

I have seen numerous applications that use layering in their layouts. When I speak of layering I am referring to layers in the z-axis relative to the view of the user. One s

Answer 1

Small addition to previous answer: to prevent onClick events on bottom "layer" set attribute clickable="true" to top "layer"

Otherwise, buttons on something with "click" events can be pressed through top layer.

I found this issue when I have tried to cover UI by RelativeLayout layer with half-transparent background.