How does Fragment lifecycle work internally in Android SDK?

The Fragment lifecycle in Android consists of various stages that determine how a Fragment is created, started, resumed, paused, stopped, and destroyed. Understanding this lifecycle is critical for managing user interface elements efficiently. Here's a breakdown of its stages:

  • onAttach(): Called when the Fragment is first attached to its context.
  • onCreate(): Called to do initial creation of the Fragment.
  • onCreateView(): Called to create the view hierarchy associated with the Fragment.
  • onActivityCreated(): Called when the Fragment's activity has been created and this Fragment's view hierarchy instantiated.
  • onStart(): Called when the Fragment becomes visible to the user.
  • onResume(): Called when the Fragment is visible and actively running.
  • onPause(): Called when the Fragment is no longer interacting with the user.
  • onStop(): Called when the Fragment is no longer visible to the user.
  • onDestroyView(): Called when the view hierarchy associated with the Fragment is being removed.
  • onDestroy(): Called when the Fragment is being destroyed.
  • onDetach(): Called when the Fragment is detached from its activity.

Below is an example illustrating how to implement these lifecycle methods in a Fragment:

public class MyFragment extends Fragment {
            @Override
            public void onAttach(Context context) {
                super.onAttach(context);
                Log.d("MyFragment", "onAttach Called");
            }

            @Override
            public void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                Log.d("MyFragment", "onCreate Called");
            }

            @Override
            public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                     Bundle savedInstanceState) {
                Log.d("MyFragment", "onCreateView Called");
                return inflater.inflate(R.layout.fragment_my, container, false);
            }

            @Override
            public void onActivityCreated(Bundle savedInstanceState) {
                super.onActivityCreated(savedInstanceState);
                Log.d("MyFragment", "onActivityCreated Called");
            }

            @Override
            public void onStart() {
                super.onStart();
                Log.d("MyFragment", "onStart Called");
            }

            @Override
            public void onResume() {
                super.onResume();
                Log.d("MyFragment", "onResume Called");
            }

            @Override
            public void onPause() {
                super.onPause();
                Log.d("MyFragment", "onPause Called");
            }

            @Override
            public void onStop() {
                super.onStop();
                Log.d("MyFragment", "onStop Called");
            }

            @Override
            public void onDestroyView() {
                super.onDestroyView();
                Log.d("MyFragment", "onDestroyView Called");
            }

            @Override
            public void onDestroy() {
                super.onDestroy();
                Log.d("MyFragment", "onDestroy Called");
            }

            @Override
            public void onDetach() {
                super.onDetach();
                Log.d("MyFragment", "onDetach Called");
            }
        }

Android Fragment Lifecycle Fragment Management Android Development

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