Definition:
It is a building block of the Activity user interface that contributes its own portion of the UI to the whole activity.The Fragment is a behavior or a part of user interface in an Activity. It makes flexible and reusable UI components for large screen devices. A Fragment can never exist alone and is associated with an Activity.
Introduction:
Android introduced Fragments to enable the creation of adaptive user interfaces. They break it down to pieces of activity that can be reused in several screens. Each Fragment has its own lifecycle methods which are similar to activity lifecycle along with adding or removing a fragment from the activity, dynamically.
Explanation:
A Fragment, like an Activity is a sort of entry point to access the UI components. It has its own layout files, event handlers and lifecycle states. Developers use Fragments to build multi-pane UIs, screen transitions that survive after their activity is finished and comprehensive, single-time creation of the whole aspect during a first run.
The Fragment lifecycle is pretty similar to that of an Activity but has additional states (onAttach, onCreateView, onDetach). Smoothness of coordination between UI behavior among Fragments and Activities.
Features / Characteristics:
- Modular and reusable UI components
- Has its own lifecycle other than the Activity
- Allows adding and removing dynamically at runtime
- Provides decoupling between phone and tablet UI design
- Can process its own input events and do processing.
- Supports binding to the host activity
- Memory efficient when orientation is changed.
Example
Think of an app on a tablet which has some two pane layout; the one border has information (list etc.) and other more detailed version of that when something is selected.
ListFragment presents the list of items.
DetailFragment displays the contents of the selected item.
The user taps an item, the Activity makes a Fragment Transaction and replaces DetailFragment with a new one, populated with fresh data.
Advantages / Importance
- Improves the flexibility of UI on various screen sizes
- Permits the cleaner structuring and organizing of larger applications
- Minimize duplication with encouragement for UI reusability.
- Enhanced performance by updating specific region of the UI only
- 8-4 26 Simplified managing device configuration changes
Permits dynamic UI modification at runtime Let’s you update the UI dynamically in Fragment Transactions
Conclusion:
Fragments enable powerful, screen-size flexibility and re-useable UI components in Android. Their lifecycle, states, and transaction system provide a simple way to manage your UI and create slick user experiences. It’s crucial to grasp how Fragment works in order to create modern and fluid Android applications that adapt gracefully over time.
see about on the : Android Application Components and their roles
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