In Android Endless Scrolling is not working in fragment

Question

I am trying to implement this source code for making endless scroll recycle view. But not working in this case. I am trying both recyclerView.addOnScrollListener() and recyclerView.setOnScrollListener() but not working

    @Override
    public View onCreateView(LayoutInflater inflater, final ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View view = inflater.inflate(R.layout.fragment_sanction_info, container, false);
        recyclerView = view.findViewById(R.id.recyclerView);

        linearLayoutManager = new LinearLayoutManager(getActivity());
        linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
        recyclerView.setLayoutManager(linearLayoutManager);

        sanctionInfoAdapter = new SanctionInfoAdapter(getActivity(), adapterData);
        recyclerView.setAdapter(sanctionInfoAdapter);

        recyclerView.addOnScrollListener(new EndlessRecyclerOnScrollListener(linearLayoutManager) {
            @Override
            public void onLoadMore(int current_page) {
                if (adapterData.length() > 0) {
                    loadMore(current_page);
                    Log.e(TAG, "Scroll if");
                } else {
                    loadMore(0);
                    Log.e(TAG, "Scroll else");
                }
            }
        });

        return view;

This source code getting data from api

       private void loadMore(int pageIndex) {
        final ProgressDialog pDialog = new ProgressDialog(getActivity());
        pDialog.setMessage(getString(R.string.please_wait));
        pDialog.setCanceledOnTouchOutside(false);
        pDialog.show();

        Map<String, String> params = new HashMap<>();
        params.put("username", SharedPreferenceClass.getUserName(getActivity()));
        params.put("api_key", ConstantClass.API_KEY);
        params.put("imei", SharedPreferenceClass.getImeiNumber(getActivity()));
        params.put("hits", String.valueOf(pageIndex));

        JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.POST, ConstantClass.SANCTION_INFO,
                new JSONObject(params), new Response.Listener<JSONObject>() {
            @Override
            public void onResponse(JSONObject response) {
                pDialog.dismiss();
                try {
                    adapterData = response.getJSONArray("result");
                    Log.e(TAG, adapterData.toString());
                    sanctionInfoAdapter.notifyDataSetChanged();
                } catch (Exception ex) {
                    Log.e(TAG, ex.toString());
                }
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                pDialog.dismiss();
                Log.e(TAG, error.toString());
            }
        });

        AppClass.getInstance().addToRequestQueue(jsonObjectRequest, TAG);
    }

This is my EndlessScrollListener Source Code

      public abstract class EndlessRecyclerOnScrollListener extends 
          RecyclerView.OnScrollListener {

      public static String TAG = EndlessRecyclerOnScrollListener.class
            .getSimpleName();

    public int previousTotal = 0;
    private boolean loading = true;
    int firstVisibleItem, visibleItemCount, totalItemCount;

    private int current_page = 0;

    private LinearLayoutManager mLinearLayoutManager;

    public EndlessRecyclerOnScrollListener(
            LinearLayoutManager linearLayoutManager) {
        this.mLinearLayoutManager = linearLayoutManager;
    }

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

        visibleItemCount = recyclerView.getChildCount();
        totalItemCount = mLinearLayoutManager.getItemCount();
        firstVisibleItem = mLinearLayoutManager.findFirstVisibleItemPosition();

        if (loading) {
            if (totalItemCount > previousTotal) {
                loading = false;
                previousTotal = totalItemCount;
            }
        }
        int visibleThreshold = 8;
        if (!loading
                && (totalItemCount - visibleItemCount) <= (firstVisibleItem + visibleThreshold)) {
            // End has been reached

            // Do something
            current_page++;

            onLoadMore(current_page);

            loading = true;
        }
    }

    public abstract void onLoadMore(int current_page);
}

Please refer : https://github.com/codepath/android_guides/wiki/Endless-Scrolling-with-AdapterViews-and-RecyclerView — Hardy Android, Feb 08 '18 at 05:31
@HardyAndroid I already trying this link but not working in my case — Jagjeet Singh, Feb 08 '18 at 05:35

score 2 · Accepted Answer · answered Nov 22 '18 at 12:15

I have also been facing a similar problem like this for some days now. but in my case it was the NestedScrollView that was messing with my scrollListner for the recyclerView, so all i did was to setOnScrollChangeListener to the nested ScrollView instead of the recyclerView and now i can detect when the list reaches the end and fetch more data

mNestedScrollView.setOnScrollChangeListener(new NestedScrollView.OnScrollChangeListener() {
@Override
public void onScrollChange(NestedScrollView v, int scrollX, int scrollY, int oldScrollX, int oldScrollY) {
    if(v.getChildAt(v.getChildCount() - 1) != null) {
        if ((scrollY >= (v.getChildAt(v.getChildCount() - 1).getMeasuredHeight() - v.getMeasuredHeight())) &&
                scrollY > oldScrollY) {

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

            if (isLoadData()) {

                if ((visibleItemCount + pastVisiblesItems) >= totalItemCount) {
                  fetchMoreData();

                }
            }
        }
    }
  }
});

score 0 · Answer 2 · answered Nov 15 '19 at 11:45

Instead of using recyclerview.addOnScrollListener(), use nestedScrollView.setOnScrollChangeListener().

 nestedScrollView.setOnScrollChangeListener(new NestedScrollView.OnScrollChangeListener() {

  @Override
  public void onScrollChange(NestedScrollView v, int scrollX, int scrollY, int oldScrollX,
      int oldScrollY) {
    LinearLayoutManager layoutManager = (LinearLayoutManager) questionRecyclerView.getLayoutManager();

    if (layoutManager != null) {
      int visibleItemCount = layoutManager.getChildCount();
      int totalItemCount = layoutManager.getItemCount();
      int firstVisibleItemPosition = layoutManager.findFirstVisibleItemPosition();

      if (!questionAdapter.isLoading()) {
        if (visibleItemCount +firstVisibleItemPosition >= totalItemCount
            && firstVisibleItemPosition >= 0
            && totalItemCount >= PAGE_SIZE) {

             // loadMore();  
            }            
        }
      }
    }
  }
});

In Android Endless Scrolling is not working in fragment

2 Answers2