Why does not `replace` replace a fragment?

Question

I have the following code that adds fragments to the same container R.id.container. First I add one fragment, then after user interacts with it, I add another one with the same code

FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.container, fragment);
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();

My question when I cell getSupportFragmentManager().getFragments() I can see two fragments. Why doesn't replace actually replace but add?

It actually does replace. You must be doing something wrong but it is not apparent from the code you posted. — Xaver Kapeller
– Xaver Kapeller, Commented Apr 7, 2016 at 7:49

NitroG42 · Accepted Answer · 2016-04-07 07:54:03Z

1

It keeps the two fragments because

addToBackStack(null);

means the user is able to revert back to the previous state. If you add fragment1 (using replace), then fragment2, only fragment2 is shown, but if the user press back, the FragmentManager needs to show fragment1, so it keeps a reference to both fragment.

answered Apr 7, 2016 at 7:54

NitroG42

5,3562 gold badges30 silver badges32 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Why does not `replace` replace a fragment?

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related