How to implement a mechanism to return to the previous screen after completing a transaction added to the back stack?

To return to the previous screen after performing a transaction added to the back stack in Android, the FragmentManager.popBackStack() method is usually used.

If you added a transaction to the back stack using addToBackStack(), then calling:

supportFragmentManager.popBackStack()

will take the user back to the previous fragment.

Example of adding a transaction to the stack:

supportFragmentManager.beginTransaction()
    .replace(R.id.container, NewFragment())
    .addToBackStack(null) // add to back stack
    .commit()

After this, to go back, you can call popBackStack(), for example, when pressing the "Back" button.