Why does RecyclerView restore its state after rotation?

Question

I have RecyclerView inside Fragment handled by ViewPager. How is it made that RecyclerView automatically restore its state after rotation? I thought I have to implement

LayoutManager.onSaveInstanceState()
LayoutManager.onRestoreInstanceState(Parcelable state);

by myself. Is LayoutManager or RecyclerView register some kind of onConfigurationChange receiver?

Look this answer : http://stackoverflow.com/questions/28236390/recyclerview-store-restore-state-between-activities — BenjaminBihr, Mar 06 '17 at 10:09
No, neither LayoutManger nor RecyclerView will receive onconfigurationchage. — Keyur Thumar, Mar 06 '17 at 10:15
@BenjaminBihr It says nothing about my question. I'm asking why restoring the state working by defualt, without implementing it explicitly. — AppiDevo, Mar 06 '17 at 10:25
@AppiDevo I think you should check your question once again, as i didn't find any why in your entire question. so I answered your last question only. — Keyur Thumar, Mar 06 '17 at 10:42

score 2 · Answer 1 · edited May 23 '17 at 12:25

2

A RecyclerView extends a ViewGroup so, it's extend a View.

If you put an Id on your RecyclerView, the

onSaveInstanceState/onRestoreInstanceState

will be call.

Link : RecyclerView store / restore state between activities

edited May 23 '17 at 12:25

Community

1
1

answered Mar 06 '17 at 11:23

BenjaminBihr

1,252
2
10
15

As I said earlier there are no information about my question in the link you posted. Here is helpful link: http://trickyandroid.com/saving-android-view-state-correctly/ with great explanation how AUTOMATIC state saving works. – AppiDevo Mar 06 '17 at 13:46
Ok ! Your question is not only for recyclerView if I understand correctly – BenjaminBihr Mar 06 '17 at 13:52

Why does RecyclerView restore its state after rotation?

1 Answers1