Future<void> _scanBarcode() async {
  final barcodes = await Navigator.push<List<Barcode>>(
    context,
    MaterialPageRoute(
      builder: (context) => const ScanAndPopPageExample(),
    ),
  );
  if (barcodes == null) return;
  showBarcodeListDialog(context, barcodes); // show barcode list dialog to display barcode.
}

import 'package:flutter/material.dart';
import 'package:scan_barcode/scan_barcode.dart';

class ScanAndPopPageExample extends StatefulWidget {
  const ScanAndPopPageExample({Key? key}) : super(key: key);

  @override
  State<ScanAndPopPageExample> createState() => _ScanAndPopPageExampleState();
}

class _ScanAndPopPageExampleState extends State<ScanAndPopPageExample> {
  var isPop = false;

  @override
  Widget build(BuildContext context) {
    return BarcodeWidget(
      onHandleBarcodeList: (List<Barcode> barcode) async {
        if (isPop) { // Prevent multiple pop
          return;
        }
        if (barcode.isEmpty) return;
        isPop = true;
        Navigator.of(context).pop(barcode);
      },
      scanValue: ScanValue(),
    );
  }
}

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:scan_barcode/scan_barcode.dart';

class ShowDialogExample extends StatelessWidget {
  const ShowDialogExample({
    Key? key,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return BarcodeScanPage(
      title: 'Show dialog when scanned',
      onHandleBarcodeList: (List<Barcode> barCode) async {
        if (barCode.isEmpty) return;
        await showBarcodeListDialog(
            context, barCode); // The await is important, if you don't await, multiple dialogs will be shown.
      },
    );
  }

  Future<void> showBarcodeListDialog(BuildContext context, List<Barcode> barCode) async {
    await showDialog(
      context: context,
      builder: (context) =>
          AlertDialog(
            title: const Text('Barcode list'),
            content: Column(
              mainAxisSize: MainAxisSize.min,
              children: [
                for (final barcode in barCode)
                  ListTile(
                    title: Text(barcode.rawValue ?? ''),
                    subtitle:
                    Text('type: ${barcode.type}, format: ${barcode.format}'),
                    trailing: IconButton(
                      icon: const Icon(Icons.copy),
                      onPressed: () {
                        Clipboard.setData(
                          ClipboardData(text: barcode.rawValue ?? ''),
                        );
                      },
                    ),
                  ),
              ],
            ),
            actions: [
              ElevatedButton(
                onPressed: () {
                  Navigator.of(context).pop();
                },
                child: const Text('OK'),
              ),
            ],
          ),
    );
  }
}