Fragments

A Fragment is a reusable UI module that lives inside an Activity. Think of it as a sub-Activity with its own layout, lifecycle, and logic.

Why use Fragments?

• Reuse UI across multiple Activities
• Handle different layouts for phone vs tablet
• Build multi-screen flows without multiple Activities
• Work naturally with Navigation Component

Fragments have their own lifecycle that runs alongside the Activity lifecycle. Key callbacks:

• onAttach — fragment attached to Activity
• onCreate — fragment created (no view yet)
• onCreateView — inflate the layout
• onViewCreated — view ready, set up UI here
• onDestroyView — view destroyed (clear view references)
• onDetach — fragment detached