What is Activity and Fragment in Android, and what are the differences between them?
In Android development, an Activity represents a single screen with a user interface where users can interact. It serves as a crucial component of an Android app and typically corresponds to a single window in the user interface.
A Fragment, on the other hand, is a modular section of an activity that has its own lifecycle, receives its own input events, and can be added or removed while the activity is running. Fragments are used to create more flexible user interfaces and improve the reusability of code.
The main differences between Activity and Fragment:
- Reusability: Fragments can be reused in multiple activities, promoting code reusability, whereas Activities are standalone units that represent a complete user interface.
- Modularity: Fragments allow for a modular design by breaking the user interface into smaller components that can be managed independently within an activity.
- Navigation: Activities are traditionally used for full-screen user interactions and represent a complete workflow or navigation flow in an app. Fragments are often used for smaller, reusable UI components within an activity.
- Communication: Fragments can communicate with their parent activity and other fragments within the same activity through interfaces or shared view models.
- Flexible Layouts: Fragments offer greater flexibility in creating dynamic and responsive layouts, enabling developers to adapt the UI based on different screen sizes and orientations more easily.
Understanding the distinctions between Activity and Fragment is essential for building efficient and maintainable Android applications.
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