How to add one section separator for Navigation Drawer in Android?

Question

I have a navigation drawer like this image. I want to add a section separator (like the line separating Neptune). It seems simple but I can\'t find anything on the web that

Answer 1

My hacky method is similar to Mostrapotski's.

In my Layout for my custom adapter, I'm adding a horizontal separator at the beginning of each item and setting it's visibility to gone.

For the elements that mark the beginning of a new group, I set their visibility to visible so that the separator shows up on top of it.