DiffUtil

ContactAdapter.java

//In Adapter
   public void setContactsList(final List<Contact> contactsList) {
        Log.d("LOGG_DEBUG", "setNotes COntactAdapter: ");
        ContactsDiffUtilCallback contactsDiffUtilCallback = new ContactsDiffUtilCallback(mContactList, contactsList);
        DiffUtil.DiffResult diffResult = DiffUtil.calculateDiff(contactsDiffUtilCallback);
        diffResult.dispatchUpdatesTo(this);
        mContactList.clear();
        mContactList.addAll(contactsList);
    }

ContactsDiffUtilCallback.java

package com.rogergcc.workplaycontacts.ui.utils;

import androidx.recyclerview.widget.DiffUtil;

import com.rogergcc.workplaycontacts.data.local.db.entity.Contact;

import java.util.List;

/**
 * Created on septiembre.
 * year 2023 .
 */


public class ContactsDiffUtilCallback extends DiffUtil.Callback {


    private final List<Contact> mOldList;
    private final List<Contact> mNewList;

    public ContactsDiffUtilCallback(List<Contact> oldItems, List<Contact> newItems) {
        this.mOldList = oldItems;
        this.mNewList = newItems;
    }

    @Override
    public int getOldListSize() {
        return mOldList != null ? mOldList.size() : 0;
    }

    @Override
    public int getNewListSize() {
        return mNewList != null ? mNewList.size() : 0;
    }

    @Override
    public boolean areItemsTheSame(int oldItemPosition, int newItemPosition) {
        return mNewList.get(newItemPosition).getId() == mOldList.get(oldItemPosition).getId();
    }

    @Override
    public boolean areContentsTheSame(int oldItemPosition, int newItemPosition) {
        return mNewList.get(newItemPosition).equals(mOldList.get(oldItemPosition));
    }

//    @Nullable
//    @Override
//    public Object getChangePayload(int oldItemPosition, int newItemPosition) {
//        return mNewList.get(newItemPosition).equals(mOldList.get(oldItemPosition));
//    }
}