Largan makes most of the lenses for most of the smartphone industry. They're injection-molded plastic.
And no, smartphone lenses don't take any abuse. You never get to touch the lens. Because they're molded of soft plastic, they're always protected behind a flat sheet of hard glass, sometimes sapphire glass.
Lens coatings that crack on their own would be a problem, of course. They probably use optical coatings on both lenses and the cover glass, but I imagine they source the cover glass from someone else, like maybe Corning, not the company building the lens. Apple does their own lens design these days but they need someone to manufacture it.