I have the Hamburger/Menu icon in the top left corner of the app in the Action Bar. I know that the normal action bar items (which are on the right) have specific rules about size and opacity (like 60 or 80% opacity, etc). Do those same rules apply to the hamburger icon on the right?
In the Iconography > Action Bar section of Android Design Guidelines you can find this:
In the same section you can download the "Action Bar Icon Pack".
It contains the "Navigation Drawer Indicator" icon files (i.e., the hamburger icon).
I think we can therefore assume the guidelines apply to that icon, too.