MovieAdapter.kt

class MovieAdapter: PagingDataAdapter<Movie, MovieAdapter.MovieViewHolder>(MovieDiffCallback) {

    override fun onBindViewHolder(holder: MovieViewHolder, position: Int) {
        val movie = getItem(position)
        holder.itemView.movie_title.text = movie.title
        holder.itemView.movie_image.load(ImageUrlProvider.posterPathUrl(movie.posterPath))
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MovieViewHolder {
        return MovieViewHolder(
            LayoutInflater.from(parent.context)
                .inflate(R.layout.movie_item, parent, false)
        )
    }
  
    class MovieViewHolder(view: View) : RecyclerView.ViewHolder(view)

    object MovieDiffCallback: DiffUtil.ItemCallback<Movie>() {
        override fun areItemsTheSame(oldItem: Movie, newItem: Movie): Boolean {
            return oldItem.id == newItem.id
        }

        override fun areContentsTheSame(oldItem: Movie, newItem: Movie): Boolean {
            return oldItem == newItem
        }
    }
}