DiffUtilCallback.kt

import android.support.v7.util.DiffUtil


class DiffUtilCallback<T>(private val oldList: List<T>, private val newList: List<T>) : DiffUtil.Callback() {
    override fun areItemsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean = oldList[oldItemPosition] == newList[newItemPosition]

    override fun getOldListSize(): Int = oldList.size

    override fun getNewListSize(): Int = newList.size

    override fun areContentsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean = oldList[oldItemPosition]?.hashCode() == newList[newItemPosition]?.hashCode()
}