OfFragmentManager

OfFragmentManager is a class in the Android framework that provides a way to manage fragments within an activity. It is part of the Android Support Library, which allows developers to use fragments on devices running Android versions as low as 1.6. The FragmentManager class is responsible for performing actions such as adding, removing, and replacing fragments in an activity's layout.

The primary methods of the FragmentManager class include:

- beginTransaction(): This method returns a FragmentTransaction object, which is used to perform a series of fragment operations atomically.

- findFragmentById(): This method retrieves a fragment that was identified by a specific ID in the activity's layout.

- findFragmentByTag(): This method retrieves a fragment that was identified by a specific tag.

- getBackStackEntryCount(): This method returns the number of entries currently in the back stack.

- popBackStack(): This method pops the top state off the back stack.

FragmentManager is an essential component of the Android architecture, enabling developers to create more modular and reusable UI components. By using fragments, developers can create a more dynamic and flexible user interface, allowing for better separation of concerns and easier maintenance of the codebase.