Fast QR Reader Widget (2OS)

flutter fast qr reader

fast qr reader widget is a flutter plugin for ios and android allowing access to the device cameras to scan multiple types of codes (qr, pdf417, code39, etc). heavily based on the camera.

features:

• display live camera preview in a widget.
• uses native avfoundation code detection in ios
• uses ml kit in android

installation

first, add fast_qr_reader_view as a dependency in your pubspec.yaml file.

ios

add a row to the ios/runner/info.plist with the key privacy - camera usage description and a usage description.

or in text format add the key:

<key>nscamerausagedescription</key>
<string>can i use the camera please?</string>

android

add firebase to your project following this step (only that step, not the entire guide).

change the minimum android sdk version to 21 (or higher) in your android/app/build.gradle file.

minsdkversion 21

example

here is a small example flutter app displaying a full screen camera preview.

import 'dart:async';
import 'package:flutter/material.dart';
import 'package:fast_qr_reader_view/fast_qr_reader_view.dart';

list<cameradescription> cameras;

future<null> main() async {
  cameras = await availablecameras();
  runapp(new cameraapp());
}

class cameraapp extends statefulwidget {
  @override
  _cameraappstate createstate() => new _cameraappstate();
}

class _cameraappstate extends state<cameraapp> {
  qrreadercontroller controller;

  @override
  void initstate() {
    super.initstate();
    controller = new qrreadercontroller(cameras[0], resolutionpreset.medium, [codeformat.qr], (dynamic value){
        print(value); // the result!
    // ... do something
    // wait 3 seconds then start scanning again.
    new future.delayed(const duration(seconds: 3), controller.startscanning);
    });
    controller.initialize().then((_) {
      if (!mounted) {
        return;
      }
      setstate(() {});
      controller.startscanning();
    });
  }

  @override
  void dispose() {
    controller?.dispose();
    super.dispose();
  }

  @override
  widget build(buildcontext context) {
    if (!controller.value.isinitialized) {
      return new container();
    }
    return new aspectratio(
        aspectratio:
        controller.value.aspectratio,
        child: new qrreaderpreview(controller));
  }
}

for a more elaborate usage example see here.

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