I see Android 6/7 I can to customize the navigation bar ("back", "home" and "recent" buttons). I can reorder, remove or add other pre-defined buttons.
I want add new custom buttom. By example, I want a "screenshot" button to avoid hold down+power to do a screenshot.
Is it possible?
EDIT: My devices are LG K10 (2016 and 2017 versions)