Android Data binding - Error:(119, 29) Identifiers must have user defined types from the XML file. main_radio_subscribe is missing it

Question

I been trying to control the visibility of a view using the Implicit Attribute Listeners(reference) in android data binding which allows to access views by id and access at

Answer 1

Looks like the implicit Attribute listeners use camel case when it is used in the expressions, thanks to this post I figured it out.

Documenting for others who have the same issue