RecyclerView scrolled UP/DOWN listener

Question

How do we know if user scrolled down or up in RecyclerView ?

I tried with RecyclerView#OnScrollListener , it gives the amount of vertical scroll and the scroll state. How do we get the last scroll position when started to dragging and scrolled position when scroll state idle.

Answer 1

The accepted answer works fine, but @MaciejPigulski gave more clear and neat solution in the comment below. I just putting it as an answer here. Here's my working code.

mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {

    @Override
    public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
        super.onScrolled(recyclerView, dx, dy);
        if (dy > 0) {
            // Scrolling up
        } else {
            // Scrolling down
        }
    }

    @Override
    public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
        super.onScrollStateChanged(recyclerView, newState);

        if (newState == AbsListView.OnScrollListener.SCROLL_STATE_FLING) {
            // Do something
        } else if (newState == AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL) {
            // Do something
        } else {
            // Do something
        }
    }
});

Answer 2

Try this way:

private static int firstVisibleInListview;

firstVisibleInListview = yourLayoutManager.findFirstVisibleItemPosition();

In your scroll listener:

public void onScrolled(RecyclerView recyclerView, int dx, int dy) 
{
    super.onScrolled(recyclerView, dx, dy);

    int currentFirstVisible = yourLayoutManager.findFirstVisibleItemPosition();

    if(currentFirstVisible > firstVisibleInListview)
       Log.i("RecyclerView scrolled: ", "scroll up!");
    else
       Log.i("RecyclerView scrolled: ", "scroll down!");  

    firstVisibleInListview = currentFirstVisible;

}

Answer 3

I wanted to hide a layout if the recyclerview is scrolled down and then make it visible if the recyclerview is scrolled up. I did some thinking and came up with this logic. Variable y is a global static int. Do not forget to declare y as static int y;

I hope it helps someone :)

 mRecyclerView.addOnScrollListener(new EndlessRecyclerOnScrollListener(lLayout) {
           @Override
            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
            // super.onScrolled(recyclerView, dx, dy);
                y=dy;
            }

            @Override
            public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
                super.onScrollStateChanged(recyclerView, newState);
                if(mRecyclerView.SCROLL_STATE_DRAGGING==newState){
                    //fragProductLl.setVisibility(View.GONE);
                }
                if(mRecyclerView.SCROLL_STATE_IDLE==newState){
                   // fragProductLl.setVisibility(View.VISIBLE);
                    if(y<=0){
                        fragProductLl.setVisibility(View.VISIBLE);
                    }
                    else{
                        y=0;
                        fragProductLl.setVisibility(View.GONE);
                    }
                }
            }
        });

Answer 4

Another simple solution that can detect scroll direction with the help of your adapter:

class MyRecyclerViewAdapter extends RecyclerView.Adapter<MyViewHolder> {
    int lastItemPosition = -1;

    @Override
    public void onBindViewHolder(MyViewHolder holder, int position) {
        if (position > lastItemPosition) {
            // Scrolled Down
        }
        else {
            // Scrolled Up
        }
        lastItemPosition = position;
     }
}

^ Helpful when doing item animations upon scrolling.

PS: This will tell you directions discontinuously until further onBindViewHolder calls.

Answer 5

this code work for me

private var nearmeListScrollListener = object : RecyclerView.OnScrollListener() {
        override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
            super.onScrolled(recyclerView, dx, dy)

          
                if (recyclerView.scrollState == RecyclerView.SCROLL_STATE_SETTLING)
                    if (dy > 0) {
                        layout_vendros_list_header.hide()
                         layout_vendros_list_header.animate().translationY(1f)
                    } else if (dy < 0) {
                        layout_vendros_list_header.show()
                        layout_vendros_list_header.animate().translationY(0f)
                    }

        }
    }
    ```