(Smooth)ScrollToPosition doesn't work properly with RecyclerView

Question

I\'m using basic RecyclerView with GridLayoutManager. I observed that nor smoothScrollToPosition nor scrollToPosition works properly.

a) when using smoothScrol

Answer 1

Actually, if you have a RecyclerView inside a NestedScrollView, you must use both of these lines every time you want to go to the beginning of the RecyclerView:

nestedScrollView.smoothScrollTo(0, 0);
layoutManager.scrollToPositionWithOffset(0, 0);

This completely works for me.

Answer 2

How to perform smooth scrolling and save RecyclerView vertical position after device rotating: This is the method that works for my case,

public class MainFragment extends Fragment { //OR activity it's //fragment in my case
    ....
 @Override
    public void onLoadFinished(@NonNull Loader<List<Report>> loader, List<Report> objects) { // or other method of your choice, in my case it's a Loader 
    RecyclerView recyclerViewRv = findViewById(........;
         .....
    recyclerViewRv.setAdapter(.....Your adapter);

            recyclerViewRv.addOnScrollListener(new RecyclerView.OnScrollListener() {
                @Override
                public void onScrollStateChanged(@NonNull RecyclerView recyclerView, int newState) {
                    super.onScrollStateChanged(recyclerView, newState);
                }

                @Override
                public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
                    super.onScrolled(recyclerView, dx, dy);
                    recyclerScrollY = recyclerViewRv. computeVerticalScrollOffset();
                }
            });

    //Apply smooth vertical scroll
    recyclerViewRv.smoothScrollBy(0,recyclerScrollY);
}
    //Save vertical scroll position before rotating devices
    @Override
        public void onSaveInstanceState(@NonNull Bundle outState) {
            super.onSaveInstanceState(outState);
            outState.putInt("recyclerScrollY",recyclerScrollY);
        }

    //BackUp vertical scroll position after rotating devices 
    @Override
        public void onCreate(@Nullable Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            if(savedInstanceState != null) {
                recyclerScrollY = savedInstanceState.getInt("recyclerScrollY");
            }
        }
//If you want to perform the same operation for horizontal scrolling just add a variable called recyclerScrollX = recyclerScrollY = recyclerViewRv. computeHorizontalScrollOffset(); then save in bundle

Answer 3

this worked for me

    Handler().postDelayed({
                    (recyclerView.getLayoutManager() as LinearLayoutManager).scrollToPositionWithOffset( 0, 0)

}, 100)

Answer 4

To scroll down smoothly to bottom from any position in the RecyclerView on clicking EditText.

edittext.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                rv_commentList.postDelayed(new Runnable() {
                    @Override
                    public void run() {
                      rv_commentList.scrollToPosition(rv_commentList.getAdapter().getItemCount() - 1);
                    }
                }, 1000);
            }
        });

Answer 5

I was facing a weird issue wherein smoothScrollToPosition only worked occasionally.

After putting the smoothScrollToPosition inside Handler Post Delayed with 1 second delay, it worked fine.

Refer to the following Kotlin example:

Handler().postDelayed({

   recyclerViewObject.smoothScrollToPosition(0) // mention the position in place of 0

}, 1000) // 1000 indicates the 1 second delay.

Answer 6

Try measuring item width or height and call smoothScrollBy(int dx, int dy).