DiffUtilCallback.kt

class DiffUtilCallback(
    private val oldItems: List,
    private val newItems: List
) : DiffUtil.Callback() {
    override fun areItemsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean {
    return oldItems[oldItemPosition].id == newItems[newItemPosition].id
}
 
override fun areContentsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean {
    // It works properly if Item is a data class
    // Otherwise, we should check if all fields of the items are the same
    return oldItems[oldItemPosition] == newItems[newItemPosition]
}
 
override fun getOldListSize() = oldItems.size
 
override fun getNewListSize() = newItems.size
}