Endless RecyclerView with ProgressBar for pagination

Question

I am using a RecyclerView and fetching objects from an API in batches of ten. For pagination, I use EndlessRecyclerOnScrollListener.

It\'s all working properly. Now

Answer 1

I implemented this on my old project, I did it as follows...

I've created an interface as the guys of your examples did

public interface LoadMoreItems {
  void LoadItems();
}

Then I add added an addOnScrollListener() on my Adapter

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

                totalItemCount = linearLayoutManager.getItemCount();
                lastVisibleItem = linearLayoutManager
                        .findLastVisibleItemPosition();
                if (!loading
                        && totalItemCount <= (lastVisibleItem + visibleThreshold)) {
                    //End of the items
                    if (onLoadMoreListener != null) {
                        onLoadMoreListener.LoadItems();
                    }
                    loading = true;

                }
            }
        });

The onCreateViewHolder() is where I put the ProgressBar or not.

@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent,
                                                  int viewType) {
    RecyclerView.ViewHolder vh;
    if (viewType == VIEW_ITEM) {
        View v = LayoutInflater.from(parent.getContext()).inflate(
                R.layout.list_row, parent, false);

        vh = new StudentViewHolder(v);
    } else {
        View v = LayoutInflater.from(parent.getContext()).inflate(
                R.layout.progressbar_item, parent, false);

        vh = new ProgressViewHolder(v);
    }
    return vh;
}

On my MainActivity that is where I put the LoadItems() to add the others items is :

mAdapter.setOnLoadMoreListener(new LoadMoreItems() {
        @Override
        public void LoadItems() {
            DataItemsList.add(null);
            mAdapter.notifyItemInserted(DataItemsList.size() - 1);

            handler.postDelayed(new Runnable() {
                @Override
                public void run() {
                    //   remove progress item
                    DataItemsList.remove(DataItemsList.size() - 1);
                    mAdapter.notifyItemRemoved(DataItemsList.size());
                    //add items one by one
                    //When you've added the items call the setLoaded()
                    mAdapter.setLoaded();
                    //if you put all of the items at once call
                    // mAdapter.notifyDataSetChanged();
                }
            }, 2000); //time 2 seconds

        }
    });

For more information I just followed this Github repository(Note: this is using AsyncTask maybe it's useful as my answer, since I did it manually not with data from API but it should work as well) also this post was helpful to me endless-recyclerview-with-progress-bar

Also I don't know if you named it but I also found this post infinite_scrolling_recyclerview, maybe it could also help to you.

If it's not what you are looking for, let me know and tell me what's wrong with this code and I'll try to modify it as your like.

Hope it helps.

EDIT

Since you don't want to remove an item... I found I guess one guy that removes the footer only on this post : diseño-android-endless-recyclerview.

This is for ListView but I know you can adapt it to RecyclerView he's not deleting any item he's just putting Visible/Invisible the ProgressBar take a look : detecting-end-of-listview

Also take a look to : this question android-implementing-progressbar-and-loading-for-endless-list-like-android