RecyclerView scroll listener's method onscolled calls automatically without scrolling

Question

While implementing pagination. I faced this issue. Without scrolling the onscrolled method continuously calling. Please check my code below.

For reference, I'm using Endless Scrolling with AdapterViews and RecyclerView

There is also one demo example this.

I'm requesting data from API. So I implemented volley. After setup, strange thing happened. OnScrolled method continuously calling without scrolling. Below is my code.

    HomeFragment.java

    view = inflater.inflate(R.layout.fragment_home, container, false);

    tvNoDataFound = (TextView) view.findViewById(R.id.tv_no_data_found);
    recyclerView = (RecyclerView)view.findViewById(R.id.listView);

    linearLayoutManager = new LinearLayoutManager(getActivity());

    recyclerView.setNestedScrollingEnabled(false);

    recyclerView.setLayoutManager(linearLayoutManager);


    context = view.getContext();

    // Lookup the swipe container view
    swipeProjects = (SwipeRefreshLayout)view.findViewById(R.id.swipeProjects);

    // Setup refresh listener which triggers new data loading
    swipeProjects.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
        @Override
        public void onRefresh() {
            // Your code to refresh the list here.
            // Make sure you call swipeContainer.setRefreshing(false)
            // once the network request has completed successfully.
            getProjects(0,0);
        }
    });
    // Configure the refreshing colors
    swipeProjects.setColorSchemeResources(android.R.color.holo_blue_bright,
            android.R.color.holo_green_light,
            android.R.color.holo_orange_light,
            android.R.color.holo_red_light);

    List<LatestProject> getLatest = getProjects(0,0);

    recyclerView.addOnScrollListener(new EndlessRecyclerViewScrollListener(linearLayoutManager) {

        @Override
        public void onLoadMore(int page, int totalItemsCount) {

            Log.e("here scrolling","scrolling---"+page+"---"+totalItemsCount);

            // Triggered only when new data needs to be appended to the list
            // Add whatever code is needed to append new items to the bottom of the list
            List<LatestProject> getLatest = getProjects(totalItemsCount,page);
        }
    });
return view;

after get the response from server, I used below function to set adapter.

public List<LatestProject> returnProjects(List<LatestProject> list, int offset, int curSizes){

    if(offset!=0){
        int curSize = adapter.getItemCount();
        latestProjectsList.addAll(list);
        adapter.notifyItemRangeInserted(curSize, list.size() - 1);
    }else{
        latestProjectsList = list;
        adapter = new ProjectListAdapter(list,getActivity(),HomeFragment.this);
        recyclerView.setAdapter(adapter);
    }
    return list;
}

In above code my first API call has offset 0. I don't know what is the issue. Is it because of volley asynchronous request?

Algolagnia

Answer 1

recyclerView.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);

                LinearLayoutManager linearLayoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();

                if (!isLoading) {
                    if (linearLayoutManager != null && linearLayoutManager.findLastCompletelyVisibleItemPosition() == rowsArrayList.size() - 1) {
                        //bottom of list!
                        loadMore();
                        isLoading = true;
                    }
                }
            }
        });

Source : JournalDev

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