flutter_qrreader_tut

.\lib\main.dart

import 'package:flutter/material.dart';
import 'package:qr_mobile_vision/qr_camera.dart';
//...
class _MyHomePageState extends State<MyHomePage> {
  //...
  _qrCallback(String code) {}
  
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      //...
      body: _camState
          ? Center(
              child: SizedBox(
                width: 512,
                height: 1024,
                child: QrCamera(
                  onError: (context, error) => Text(
                    error.toString(),
                    style: TextStyle(color: Colors.red),
                  ),
                  qrCodeCallback: (code) {
                    _qrCallback(code);
                  },
                ),
              ),
            )
          : Center(
              child: Text(_qrInfo),
            ),
      //...
    );
  }
}