pagination in recyclerView

paginationInRecyclerView.txt

    private boolean isLoading = false;
    private boolean isEndOfList = false;
    private String currentPage = "1";
    .
    .
    .
   
   @Override
    protected void onCreate(Bundle savedInstanceState) {
        .
        .
        .
        
       /* Init user video recyclerView */
            initUserVideosRecyclerView();
        
        
       /* Get list from server */
            currentPage = "1";
            getListFromServer(currentPage);


       /* Handle pagination */
            rv_userVideos.addOnScrollListener(new RecyclerView.OnScrollListener() {
                @Override
                public void onScrollStateChanged(@NonNull RecyclerView recyclerView, int newState) {
                    super.onScrollStateChanged(recyclerView, newState);

                    if (!recyclerView.canScrollVertically(1) && !isEndOfList && !isLoading) {
                            currentPage = String.valueOf(Integer.valueOf(currentPage) + 1);
                            getListFromServer(currentPage);
                   }
               }

            });
        .
        .
        .
    }
    
        
        
    /* Init user video recyclerView */
        private void initUserVideosRecyclerView() {
            // set recyclerView orientation
            RecyclerView.LayoutManager mLayoutManager = new GridLayoutManager(this, 2);
            rv_userVideos.setLayoutManager(mLayoutManager);

            // set recyclerView item decoration
    //        rv_userVideos.addItemDecoration(new GridSpacingItemDecoration(1, dpToPx(5), true));

            rv_userVideos.setItemAnimator(new DefaultItemAnimator());

            // set recyclerView Adapter
            userVideoRecyclerAdapter = new UserVideoRecyclerAdapter(this, userVideoList, true);
            rv_userVideos.setAdapter(userVideoRecyclerAdapter);

            userVideoRecyclerAdapter.setOnItemClickListener(position -> {
                //TODO
            });
        }
    
    
    /* Get list from server */
        private void getListFromServer(String pageNumber) {
            // definition api interface
            APIInterface apiInterface = RetrofitClient.getRetrofitInstance().create(APIInterface.class);
            
            // calling getAdultUserVideos method in api interface
            Call<UserVideoListResponse> call = apiInterface.getAdultUserVideos(pageNumber);
    
            // handle progress visibility
            if (pageNumber.equals("1")) {
                // show progress and hide content before call
                pageContentLoadingContainer.setVisibility(View.VISIBLE);
                pageContentContainer.setVisibility(View.GONE);
            } else {
                //show rv progress
                recyclerViewProgress.setVisibility(View.VISIBLE);
            }


            // call request
            call.enqueue(new Callback<UserVideoListResponse>() {
                @Override
                public void onResponse(Call<UserVideoListResponse> call, Response<UserVideoListResponse> response) {
                    isLoading = false
                    // handle progress visibility
                    if (pageNumber.equals("1")) {
                        // hide progress and show content
                        pageContentLoadingContainer.setVisibility(View.GONE);
                        pageContentContainer.setVisibility(View.VISIBLE);
                    } else {
                        recyclerViewProgress.setVisibility(View.GONE);
                    }
                
                    // get response
                    if (response.isSuccessful() && response.body() != null) {
                        // handle empty recyclerView
                        if (pageNumber.equals("1") && response.body().getUserVideoListWithPagination().getUserVideoList().size() == 0) {
                            emptyRecyclerViewText.setVisibility(View.VISIBLE);
                        } else {
                            emptyRecyclerViewText.setVisibility(View.GONE);
                        }
                            
                        // add data to list
                        if (response.body().getUserVideoListWithPagination().getUserVideoList().size() != 0) {
                            userVideoList.addAll(response.body().getUserVideoListWithPagination().getUserVideoList());
                            userVideoRecyclerAdapter.notifyDataSetChanged();
                        }

                        nextUrl = response.body().getUserVideoListWithPagination().getNext_page_url();
                        isEndOfList = nextUrl == null;
                    } else {
                        // Log
                    }
                }
            
                @Override
                public void onFailure(Call<UserVideoListResponse> call, Throwable t) {
                    isLoading = false
                    // Log
                }
            });
        }