How to save scroll position of RecyclerView in Android?

Question

I have Recycler view which lays inside of SwipeRefreshLayout. Also, have ability to open each item in another activity. After returning back to Recycler I need scroll to chosen item, or to previous Y. How to do that?

Yes, I googled, found articles in StackOverFlow about saving instance of layout manager, like this one: RecyclerView store / restore state between activities. But, it doesn't help me.

UPDATE

Right now I have this kind of resolving problem, but, of course, it also doesn't work.

private int scrollPosition;  ...//onViewCreated - it is fragment recyclerView.setHasFixedSize(true); LinearLayoutManager llm = new LinearLayoutManager(getActivity()); recyclerView.setLayoutManager(llm); data = new ArrayList<>(); adapter.setData(getActivity(), data); recyclerView.setAdapter(adapter); ...  @Override public void onResume() {     super.onResume();     recyclerView.setScrollY(scrollPosition); }  @Override public void onPause() {     super.onPause();     scrollPosition = recyclerView.getScrollY(); } 

Yes, I have tried scrollTo(int, int) - doen't work.

Now I tried just scroll, for example, to Y = 100, but it doesn't scrolling at all.

Answer 1

Save the current state of recycle view position @onPause:

    positionIndex= llManager.findFirstVisibleItemPosition();     View startView = rv.getChildAt(0);     topView = (startView == null) ? 0 : (startView.getTop() - rv.getPaddingTop()); 

Restore the scroll position @onResume:

    if (positionIndex!= -1) {         llManager.scrollToPositionWithOffset(positionIndex, topView);     } 

or another way can be @onPause:

long currentVisiblePosition = 0; currentVisiblePosition = ((LinearLayoutManager)rv.getLayoutManager()).findFirstCompletelyVisibleItemPosition(); 

restore @onResume:

((LinearLayoutManager) rv.getLayoutManager()).scrollToPosition(currentVisiblePosition); currentVisiblePosition = 0; 

Answer 2

A lot of these answers seem to be over complicating it.

The LayoutManager supports onRestoreInstanceState out of the box so there is no need to save scroll positions etc. The built in method already saves pixel perfect positions.

example fragment code (null checking etc removed for clarity):

private Parcelable listState; private RecyclerView list;  @Override public void onCreate(@Nullable Bundle savedInstanceState) {     super.onCreate(savedInstanceState);      listState=savedInstanceState.getParcelable("ListState");  }  @Override public void onSaveInstanceState(Bundle outState) {     super.onSaveInstanceState(outState);      outState.putParcelable("ListState", list.getLayoutManager().onSaveInstanceState());  } 

then just call

list.getLayoutManager().onRestoreInstanceState(listState); 

once your data has been reattached to your RecyclerView