ContactAdapter.java

public class ContactAdapter extends RecyclerView.Adapter<contactAdapter.ContactHolder> {

  private List<Contact> contacts = new ArrayList<>();
    private Context cxt;
    String telnum;
    Activity activity;


    @Override
    public ContactHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.contact_item, parent, false);
        return new ContactHolder(itemView);
    }

    @Override
    public void onBindViewHolder(ContactHolder holder, int position) {

        Contact currentContact = contacts.get(position);
        holder.textViewTitle.setText(currentContact.getTitle());



        if((!currentContact.equals(null))){

            if (currentContact.getNumone() != null ) {
                holder.numone.setVisibility(View.VISIBLE);
                holder.imageview1.setVisibility(View.VISIBLE);
                String str = currentNote.getNumone().replaceAll("\\s+","");
                holder.numone.setText(str);

            }
            //Apply Logic related to Contact attributes here (same for getNumone)

        }
        
    @Override
    public int getItemCount() {
        return contacts.size();
    }


    public void setContacts(List<Contact> contacts, Context cxt, Activity activity) {
        this.contacts = contacts;
        this.cxt=cxt;
        notifyDataSetChanged();
        this.activity=activity;
    }


    
    
        
      class ContactHolder extends RecyclerView.ViewHolder {

        private TextView textViewTitle;
        private TextView numone;
        private TextView numtwo;
        private TextView numthree;
        private TextView numfour;
        private ImageView imageview1,imageview2,imageview3,imageview4;

        public ContactHolder(View itemView) {
            super(itemView);
            textViewTitle = itemView.findViewById(R.id.text_view_title);
            numone = itemView.findViewById(R.id.numone);
             numtwo=itemView.findViewById(R.id.numtwo);
            numthree=itemView.findViewById(R.id.numthree);
            numfour=itemView.findViewById(R.id.numone2);
            imageview1=itemView.findViewById(R.id.phoneiv2);
            imageview2=itemView.findViewById(R.id.phoneiv);
            imageview3=itemView.findViewById(R.id.phoneiv1);
            imageview4=itemView.findViewById(R.id.phoneiv3);


           


            

    }