public class ShipmentsAdaptor extends ArrayAdapter<Shipment> {

    private RealmResults<Shipment> dataSet;
    Context mContext;

    // View lookup cache
    private static class ViewHolder {
        TextView stockItemId;
        TextView technicianName;
        TextView shipmentDate;
    }

    public ShipmentsAdaptor(RealmResults<Shipment> data, Context context){
        super(context, R.layout.shipments_out_row_item, data);
        this.dataSet = data;
        this.mContext = context;
    }

    private int lastPosition = -1;

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // Get the data item for this position
        Shipment shipment = getItem(position);
        // Check if an existing view is being reused, otherwise inflate the view
        ViewHolder viewHolder; // view lookup cache stored in tag

        final View result;

        if (convertView == null) {

            viewHolder = new ViewHolder();
            LayoutInflater inflater = LayoutInflater.from(getContext());
            convertView = inflater.inflate(R.layout.shipments_out_row_item, parent, false);
            viewHolder.stockItemId = convertView.findViewById(R.id.stockItemId);
            viewHolder.technicianName = convertView.findViewById(R.id.technicianName);
            viewHolder.shipmentDate = convertView.findViewById(R.id.shipmentDate);

            result = convertView;

            convertView.setTag(viewHolder);

        } else {
            viewHolder = (ViewHolder) convertView.getTag();
            result=convertView;
        }

        lastPosition = position;

        if(shipment != null){
            viewHolder.stockItemId.setText(String.valueOf(shipment.id));
            if(shipment.technician != null){
                viewHolder.technicianName.setText(shipment.technician.name);
            }
            viewHolder.shipmentDate.setText(shipment.shippingDate);
        }

        // Return the completed view to render on screen
        return convertView;
    }
}