Recyclerview indicates that reaches the last item

Question

I have a recycleView that I need to observe when the last item is reached but I have notice the it always indicate that I reached the last item even if I haven't scrolled yet. My code for setting up the recycler:

newsRecyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
newsRecyclerView.setFocusable(false);
newsRecyclerView.setNestedScrollingEnabled(false);
newsAdapter = new NewsAdapter(getContext(), newsDetails, categoryNumber);
newsRecyclerView.setAdapter(newsAdapter);
layoutManager = new LinearLayoutManager(getContext(), LinearLayoutManager.VERTICAL, false);

My xml code is:

            <android.support.v7.widget.RecyclerView
            android:id="@+id/news_recycler_view"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:padding="4dp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/news_top_stories_title_text_view" />

Possible duplicate of [Detect when RecyclerView reaches the bottom most position while scrolling](https://stackoverflow.com/questions/36127734/detect-when-recyclerview-reaches-the-bottom-most-position-while-scrolling) — Manohar, Aug 13 '18 at 06:08
you need to use `onScrollListener` on recyclerview and then find out last `((LinearLayoutManager) vYourRecycler.getLayoutManager()).findLastCompletelyVisibleItemPosition();` — Rahul, Aug 13 '18 at 06:36

Khemraj Sharma · Answer 1 · 2018-08-13T12:38:26.157

This is my code that I put in my Util, and use anywhere.

Util.setRecyclerViewLastPositionListner(rv, linearLayoutManager , new UtilitiesV2.OnLastPositionReached() {
            @Override
            public void onReached() {
                // last position reached
            }
        });

Put this in Util.

 private boolean userScrolled = true;
    int pastVisiblesItems, visibleItemCount, totalItemCount;


    public interface OnLastPositionReached {
        void onReached();
    }

    public void setRecyclerViewLastPositionListner(RecyclerView rvBooksMockTest, final LinearLayoutManager mLayoutManager, final OnLastPositionReached onLastPositionReached) {
        rvBooksMockTest.addOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
                super.onScrollStateChanged(recyclerView, newState);
                if (newState == AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL) {
                    userScrolled = true;
                }
            }

            @Override
            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {

                super.onScrolled(recyclerView, dx, dy);
                // Here get the child count, item count and visibleitems
                // from layout manager

                visibleItemCount = mLayoutManager.getChildCount();
                totalItemCount = mLayoutManager.getItemCount();
                pastVisiblesItems = mLayoutManager.findFirstVisibleItemPosition();

                // Now check if userScrolled is true and also check if
                // the item is end then update recycler view and set
                // userScrolled to false
                if (userScrolled && (visibleItemCount + pastVisiblesItems) == totalItemCount) {
                    userScrolled = false;
                    if (onLastPositionReached != null) onLastPositionReached.onReached();
                }
            }
        });
    }

Update According to your requirement, here is NestedScrollView bottom reach listener.

nestedScrollView.getViewTreeObserver().addOnScrollChangedListener(new ViewTreeObserver.OnScrollChangedListener() {
    @Override
    public void onScrollChanged() {
        if (nestedScrollView != null) {
            if (nestedScrollView.getChildAt(0).getBottom() <= (nestedScrollView.getHeight() + nestedScrollView.getScrollY())) {
                //scroll view is at bottom
            } else {
                //scroll view is not at bottom
            }
        }
    }
});

May be your RecyclerView is not scrollable. Or it has 1-2 items. — Khemraj Sharma, Aug 13 '18 at 10:47
I have a `scrollview` which contains a` constraintlayout` that contains the `recyclerview` so I should consider to observe the scrollview instead? — Ali Habbash, Aug 13 '18 at 12:06
Can you provide me with a link to detect when the `nestedScrollView` reaches the end — Ali Habbash, Aug 13 '18 at 12:29

score 0 · Accepted Answer · answered Aug 13 '18 at 17:06

Thanks to Khemraj who give the tip for solution because I have a recyclerview inside NestedScrollView and coordinator layout as parent for them

I have solved my problem like this:

public Disposable observeNestedScroll(LoadMoreListener listener) {
    return RxNestedScrollView.scrollChangeEvents(nestedScrollView)
            .subscribe(
                    viewScrollChangeEvent -> {
                        NestedScrollView nestedScrollView =(NestedScrollView) viewScrollChangeEvent.view();
                        if(nestedScrollView.getChildAt(nestedScrollView.getChildCount() - 1) != null) {
                            if ((viewScrollChangeEvent.scrollY() >= (nestedScrollView.getChildAt(nestedScrollView.getChildCount() - 1).getMeasuredHeight() - nestedScrollView.getMeasuredHeight())) &&
                                    viewScrollChangeEvent.scrollY() > viewScrollChangeEvent.oldScrollY()) {
                                listener.onLoadMore();
                            }
                        }
                    });
}

score 0 · Answer 3 · answered Mar 23 '21 at 18:18

I've seen to many responses for this question and I stand that all of them don't give accurate behavior as an outcome. However if you follow this approach I'm positive you'll get the best behavior.

rvCategories is your RecyclerView

categoriesList is the list passed to your adapter

binding.rvCategories.addOnScrollListener(object : RecyclerView.OnScrollListener() {
      override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
                val position = (recyclerView.layoutManager as LinearLayoutManager).findLastCompletelyVisibleItemPosition()
                if (position + 1 == categoriesList.size) {
                   // END OF RECYCLERVIEW IS REACHED
                } else {
                    // END OF RECYCLERVIEW IS NOT REACHED
                }
        }
    })

Recyclerview indicates that reaches the last item

3 Answers3