How to add tag to Fragment Transaction?

Question

I'm adding a Fragment to my Activity like this:

getSupportFragmentManager()
            .beginTransaction()              
            .add(R.id.frame_container, fragment)
            .setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN)
            .addToBackStack(fragment.getClass().getName())
            .commit();

But when I want to find the Fragment using a FragmentManager it's returning null:

 Fragment oldFragment = (Fragment) getSupportFragmentManager().findFragmentByTag(fragment.getClass().getName());

http://stackoverflow.com/questions/27717127/how-to-handle-backpress-with-fragment/27717201#27717201 — IntelliJ Amiya, Aug 31 '15 at 06:46

score 6 · Accepted Answer · answered Aug 31 '15 at 06:49

6

You try to find it by tag, but you haven't given it any tag

if you want to give it a tag, do it like this

getSupportFragmentManager()
        .beginTransaction()              
        .add(R.id.frame_container, fragment, "tagABC")
        .setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN)
        .addToBackStack(fragment.getClass().getName())
        .commit();

and then you can get it with

Fragment oldFragment = (Fragment) getSupportFragmentManager().findFragmentByTag("tagABC");

BTW, you should correct your question title, the problem has nothing related to backstack.

answered Aug 31 '15 at 06:49

Derek Fung

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Thanks a lot man! I just forget, that i should give tag at add method, not in addToBackStack – Yuriy Kolbasinskiy Aug 31 '15 at 06:53
ic. Just FYI, the parameter of addBackStack() is for naming the backStack itself, where you can revert to a backStack directly if you have multiple of it. – Derek Fung Aug 31 '15 at 06:55

How to add tag to Fragment Transaction?

1 Answers1