An Activity is a single screen in an Android application with a user interface. It acts as an entry point for interacting with the user and is responsible for managing the UI components, handling user ...

Fragments cannot live on their own--they must be hosted by an activity or another fragment. The fragment’s view hierarchy becomes part of, or attaches to, the host’s view hierarchy.

Bottom Navigation Bar Java Android Studio with Fragments How to Make a Bottom Navigation Bar in Android Studio Using Java: A Simple Guide and Step by Step ...

Learn how to use the Fragments API in Mono for Android to create an application UI for multiple screens, such as a handset and tablet.