DiffUtilCallback.kt

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
}