qr_mobile_vision 4.1.4

Plugin for reading QR codes using Firebase's Mobile Vision API.

example/lib/main.dart

import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:qr_mobile_vision/qr_camera.dart';

void main() {
  debugPaintSizeEnabled = false;
  runApp(HomePage());
}

class HomePage extends StatefulWidget {
  @override
  HomeState createState() => HomeState();
}

class HomeState extends State<HomePage> {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(home: MyApp());
  }
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  String? qr;
  bool camState = false;
  bool dirState = false;

  @override
  initState() {
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Plugin example app'),
        actions: <Widget>[
          IconButton(icon: new Icon(Icons.light), onPressed: _swapBackLightState),
        ],
      ),
      body: Center(
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.center,
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                Text("Back"),
                Switch(value: dirState, onChanged: (val) => setState(() => dirState = val)),
                Text("Front"),
              ],
            ),
            Expanded(
                child: camState
                    ? Center(
                        child: SizedBox(
                          width: 300.0,
                          height: 600.0,
                          child: QrCamera(
                            onError: (context, error) => Text(
                              error.toString(),
                              style: TextStyle(color: Colors.red),
                            ),
                            cameraDirection: dirState ? CameraDirection.FRONT : CameraDirection.BACK,
                            qrCodeCallback: (code) {
                              setState(() {
                                qr = code;
                              });
                            },
                            child: Container(
                              decoration: BoxDecoration(
                                color: Colors.transparent,
                                border: Border.all(
                                  color: Colors.orange,
                                  width: 10.0,
                                  style: BorderStyle.solid,
                                ),
                              ),
                            ),
                          ),
                        ),
                      )
                    : Center(child: Text("Camera inactive"))),
            Text("QRCODE: $qr"),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
          child: Text(
            "on/off",
            textAlign: TextAlign.center,
          ),
          onPressed: () {
            setState(() {
              camState = !camState;
            });
          }),
    );
  }

  _swapBackLightState() async {
    QrCamera.toggleFlash();
  }
}