ContactsAdapter.java

public class ContactsAdapter extends ArrayAdapter<User> {


    private Context context;
    private List<User> contacts;
    private Callback<User> onCall;

    public ContactsAdapter(@NonNull Context context, List<User> list, Callback<User> onCall) {
        super(context, 0, list);
        this.context = context;
        contacts = list;
        this.onCall = onCall;
    }

    public void setContacts(List<User> contacts) {
        this.contacts = contacts;
    }

    @NonNull
    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
        View listItem = convertView;
        if (listItem == null)
            listItem = LayoutInflater.from(context).inflate(R.layout.row_contact, parent, false);

        Log.i("ContactsAdapter", "Render List Item " + position);

        User contact = contacts.get(position);

        TextView usernameText = listItem.findViewById(R.id.textView3);
        usernameText.setText(contact.getFullName());


        ImageView avatarImage = listItem.findViewById(R.id.avatar_image);


        Picasso.get().load(contact.getAvatarURL())
                .placeholder(R.drawable.ic_user)
                .error(R.drawable.ic_user)
                .transform(new CircleTransform()).into(avatarImage);

        TextView mobileNumberText = listItem.findViewById(R.id.mobile_number_text);
        mobileNumberText.setText(contact.getMobileNumber());

        listItem.findViewById(R.id.call_button).setOnClickListener(view -> {
            onCall.accept(contact);
        });


        return listItem;
    }

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