StopwatchAdapter.kt

class StopwatchAdapter: ListAdapter<Stopwatch, StopwatchViewHolder>(itemComparator) {

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): StopwatchViewHolder {
        val layoutInflater = LayoutInflater.from(parent.context)
        val binding = StopwatchItemBinding.inflate(layoutInflater, parent, false)
        return StopwatchViewHolder(binding)
    }

    override fun onBindViewHolder(holder: StopwatchViewHolder, position: Int) {
        holder.bind(getItem(position))
    }

    private companion object {

        private val itemComparator = object : DiffUtil.ItemCallback<Stopwatch>() {

            override fun areItemsTheSame(oldItem: Stopwatch, newItem: Stopwatch): Boolean {
                return oldItem.id == newItem.id
            }

            override fun areContentsTheSame(oldItem: Stopwatch, newItem: Stopwatch): Boolean {
                return oldItem.currentMs == newItem.currentMs &&
                        oldItem.isStarted == newItem.isStarted
            }
        }
    }
}