从另一个活动返回活动时，RecyclerView 的滚动位置丢失

Question

I m using Firebase RecyclerView.Apdapter with Firebase UI in MainActivity. When I'm opening another activity and returning back to main activity, scroll position moves to top. How to have same scroll position after closing of other activity using Firebase RecyclerView?

Answer 1

To solve this, you need to know that the component responsible one for holding the layout state (and restoring it) is the LayoutManager used in your RecyclerView . To achieve this, you can override the onSaveInstanceState() method and store the position directly in the Bundle object.

To get it back, just override the onRestoreInstanceState() method and get the position back fron the Bundle object.

In the end just simply use the following line of code in your onStart() method:

layoutManager.onRestoreInstanceState(yourListState);