findFragmentByTag() returns null after perform a FragmentTransaction using replace() method

Question

My Android app consists three fragments: A, B and C. They\'re loaded in the two containers defined in the MainActivity layout.

When th

Answer 1

In my case I used the code to replace and add to BackStack, but set wrong tag:

val fragment = { SomeFragment.newInstance() }
fragmentManager?.replaceAndAddToBackStack(R.id.container, fragment, WrongAnotherFragment.TAG)

Of course, supportFragmentManager.findFragmentByTag(SomeFragment.TAG) didn't find SomeFragment.