Final answer:
The root layout of an activity should be a Drawer Layout when a navigation view element is added.
Step-by-step explanation:
The root layout of an activity, when a navigation view element is added, should be a Drawer Layout.
A Drawer Layout is a container layout that allows you to have a sliding panel known as a navigation drawer. This is commonly used in Android apps for implementing a navigation menu or side menu.
By using a Drawer Layout as the root layout, you can easily add the navigation view element and define the behavior of the navigation drawer in your activity.