LinearLayout problem, Pagination recyclerview with DiffUtil & AsyncListDiffer not working

Question

Basically My problem is not with DiffUtil & AsyncListDiffer but the issue is in the LayoutManager item count. Please look at my code:

recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrollStateChanged(@NonNull RecyclerView recyclerView, int newState) {
                super.onScrollStateChanged(recyclerView, newState);
                if (newState == AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL) {
                    isScrolled = true;
                }
            }

            @Override
            public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
                super.onScrolled(recyclerView, dx, dy);
                currentItem = manager.getChildCount();
                totalItem = manager.getItemCount();
                scrolledOutItems = manager.findFirstVisibleItemPosition();
                if (isScrolled && currentItem + scrolledOutItems == totalItem) {
                    progress.setVisibility(View.VISIBLE);
                    isScrolled = false;
                    fetchData();
                }
            }
        });

    private void fetchData() {
        new Handler(Looper.myLooper()).postDelayed(() -> {
            setData();
            adapter.submitList(arrayList);
            progress.setVisibility(View.GONE);

        }, 1000);
    }

    void setData() {
        arrayList.add(new VideoModel(UUID.randomUUID(),"https://xxxxxxx/rap-324.mp4"));
        arrayList.add(new VideoModel(UUID.randomUUID(), "https://xxxxxxxx/ythori.mp4",));
        arrayList.add(new VideoModel(UUID.randomUUID(), "https://xxxxxxxx/minee.mp4"));
        arrayList.add(new VideoModel(UUID.randomUUID(), "https://xxxxxxxx/standw.mp4"));

    }

Behavior I'm getting:

For the first 2-3 scroll it is updating the data properly.
But after that when I'm scrolling down the totalItemCount is not matching currentItem & scrolledOutItems.

Note :

Yes I have unique items because each item has UUID.
Yes my item model class has equals() method.
Yes I have properly implemented DifUtils and AsyncListDffer.

I can share my Items counts in onScrolled Method :

I have created a log inside onScorlled() method like this: Log.d("COUNT","scrolledOutItems :"+scrolledOutItems+" "+"currentItem :"+currentItem+" "+"totalItem :"+totalItem); and the out put is->

Case 1:

scrolledOutItems :14 currentItem :2 totalItem :16
scrolledOutItems :14 currentItem :2 totalItem :16
scrolledOutItems :14 currentItem :3 totalItem :20
scrolledOutItems :14 currentItem :3 totalItem :20
scrolledOutItems :14 currentItem :3 totalItem :24
scrolledOutItems :14 currentItem :3 totalItem :24

Look the the above log as I'm adding 4 items every time it was working fine until total items 16 means total 16/4=4 scrolls, but after adding next 4 items total items became 20 but suddenly how is the next 4 items added?

Case 2:

scrolledOutItems :2 currentItem :2 totalItem :4
scrolledOutItems :2 currentItem :3 totalItem :8
scrolledOutItems :2 currentItem :3 totalItem :12

Same here also.

But if I scrolling up again then scrolling down it is working,I can clearly say the issue is in the item count.

LinearLayout problem, Pagination recyclerview with DiffUtil & AsyncListDiffer not working

0 Answers0