PostAdapter.java

public class PostAdapter extends RecyclerView.Adapter<PostAdapter.BindingHolder> {
    private List<Post> mPosts;
    private Context mContext;
    private boolean mIsUserPosts;

    public PostAdapter(Context context, boolean isUserPosts) {
        mContext = context;
        mIsUserPosts = isUserPosts;
        mPosts = new ArrayList<>();
    }

    @Override
    public BindingHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        ItemPostBinding postBinding = DataBindingUtil.inflate(
                LayoutInflater.from(parent.getContext()),
                R.layout.item_post,
                parent,
                false);
        return new BindingHolder(postBinding);
    }

    @Override
    public void onBindViewHolder(BindingHolder holder, int position) {
        ItemPostBinding postBinding = holder.binding;
        postBinding.setViewModel(new PostViewModel(mContext, mPosts.get(position), mIsUserPosts));
    }

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

    public void setItems(List<Post> posts) {
        mPosts = posts;
        notifyDataSetChanged();
    }

    public void addItem(Post post) {
        mPosts.add(post);
        notifyDataSetChanged();
    }

    public static class BindingHolder extends RecyclerView.ViewHolder {
        private ItemPostBinding binding;

        public BindingHolder(ItemPostBinding binding) {
            super(binding.cardView);
            this.binding = binding;
        }
    }

}