How to stop blinking on recycler view with architecture components paging library

Question

I have a chat-like activity where I am using a RecyclerView with a PagedListAdaper to load a bunch of messages. I\'m using a PositionalDataSource to load the data. The loading i

Answer 1

PagedListAdapterHelper deprecated in Paging Component so we should use AsyncPagedListDiffer instead of it.

Code example:

    import android.arch.paging.AsyncPagedListDiffer;
    import android.arch.paging.PagedList;
    import android.arch.paging.PagedListAdapter;
    import android.support.annotation.NonNull;
    import android.support.v7.util.DiffUtil;
    import android.view.LayoutInflater;
    import android.view.ViewGroup;


    public class PagedItemsArrayAdapter extends PagedListAdapter {

            private final AsyncPagedListDiffer mDiffer;

            public PagedItemsArrayAdapter() {
                super(DIFF_CALLBACK);
                mDiffer = new AsyncPagedListDiffer<>(this, DIFF_CALLBACK);
                setHasStableIds(true);
            }

            @Override
            public long getItemId(int position) {
               Item item = mDiffer.getItem(position);
               return item.id;
            }

            @Override
            public int getItemCount() {
                return mDiffer.getItemCount();
            }

            @Override
            public void submitList(PagedList pagedList) {

                pagedList.addWeakCallback(pagedList.snapshot(), new PagedList.Callback() {
                    @Override
                    public void onChanged(int position, int count) {
                    }

                    @Override
                    public void onInserted(int position, int count) {
                        mDiffer.submitList(pagedList);
                    }

                    @Override
                    public void onRemoved(int position, int count) {

                    }
                });

            }


            @Override
            public void onBindViewHolder(@NonNull MyViewHolder viewHolder, int position) {
                   Item item = mDiffer.getItem(position);
                   viewHolder.onBind(item); 
            }

            private static DiffUtil.ItemCallback DIFF_CALLBACK = new DiffUtil.ItemCallback() {
                @Override
                public boolean areItemsTheSame(@NonNull Item oldItem, @NonNull Item newItem) {
                    return oldItem.getId() == newItem.getId();
                }

                @Override
                public boolean areContentsTheSame(@NonNull Item oldItem, @NonNull Item newItem) {
                    return oldItem.equals(newItem);
                }
            };