Android Fragments

Introduction about Mobile Fragments, it's types, Life cycle Methods, Creating Fragments using Java and XML

1. Android Fragments RAHUL KUMAR ROLL NO. 1322232

2. Android Fragments❓🤔 A Fragment in Android is a reusable component of a user interface that represents a portion of a UI in an Activity. Android Fragment  is the part of activity, it is also known as sub-activity .  Fragments represent multiple screen inside one activity.

3. Android Fragments❓🤔 A Fragment has its own layout and its own behavior with its own lifecycle callbacks. You can add or remove fragments in an activity while the activity is running. You can combine multiple fragments in a single activity to build a multi-pane UI. A fragment can be used in multiple activities.

4. The Fragment Lifecycle

5. Android Fragment Lifecycle Methods The lifecycle of android fragment is like the activity lifecycle. The lifecycle methods for fragment are: Sr. No. Methods Description 1. onAttach ( ) Called when the fragment is first attached to its host activity. It's the first step in the fragment lifecycle. 2. onCreate ( ) Initializes the fragment, similar to an activity's onCreate (). This method is used for setting up essential components but doesn't involve the UI. 3. onCreateView ( ) Called to create the fragment’s UI. The layout for the fragment is inflated here (convert XML layout to view objects). 4. onActivityCreated ( ) Called when the host activity’s onCreate () method has completed. It indicates that the activity is fully created. 5. onStart ( ) The fragment becomes visible to the user but cannot yet interact with the user. 6. onResume ( ): The fragment is fully visible and active, and can now interact with the user.

6. Android Fragment Lifecycle Methods Sr. No. Methods Description 7. onPause ( ) The fragment is no longer interacting with the user, typically when the activity goes into the background. 8. onStop ( ) The fragment is no longer visible, usually because the activity is no longer visible. 9. onDestroyView ( ) Cleans up the resources related to the fragment's view. It is called before the fragment’s view is destroyed. 10. onDestroy ( ) Cleans up any remaining resources. The fragment is about to be destroyed. 11. onDetach ( ) The fragment is detached from the activity, completing the lifecycle. It is now no longer associated with its host activity.

7. Single frame fragments List fragments Fragment transaction Types of Fragments Basically, Fragments are divided into three stages as shown here:

8. Single frame fragments: This is the simplest type of fragment where a single fragment is used within an activity. It's typically used in apps that run on devices with smaller screens like phones. Example: A single-page detail screen or form where the fragment handles the entire UI. Types of Fragments

9. List fragments: Fragments having a special list view are called list fragments. Suitable for apps that need to display data in list format, like settings menus, contact lists, or message lists. Example: A fragment that shows a list of contacts or settings options, allowing users to select an item to view its details. Types of Fragments

10. Fragment transaction: Using fragment transaction, we can move one fragment to another fragment. Useful for switching between different fragments within the same activity Example: Navigating between different fragments in a single activity, such as switching between tabs or sections in an app. Types of Fragments

11. Fragment transaction Examples: Fragment For “ Chats” Fragment For “ Updates” Fragment For “ Communities” Fragment For “ Calls”

12. Creating and Fragments Creating a Fragment: To create a fragment , extend the Fragment class and override necessary lifecycle mehods , typically onCreateView () to inflate the layout. Java Code: public class ExampleFragment extends Fragment { @Override public View onCreateView ( LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState ) { // Inflate the layout for this fragment return inflater.inflate ( R.layout.fragment_example , container, false); } }

13. Creating and Fragments Adding Fragments to an Activity: Fragments can be added to an activity via XML. XML Code: < LinearLayout xmlns:android ="http://schemas.android.com/ apk /res/android" android:orientation ="vertical" android:layout_width =" match_parent " android:layout_height =" match_parent "> <fragment android:id ="@+id/ example_fragment " android:name =" com.example.app.ExampleFragment " android:layout_width =" match_parent " android:layout_height =" wrap_content " /> </ LinearLayout >

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