QR Bar Code Scanner Dialog #

Plugin to show a simple scanner dialog and capture Bar/QR code easily. Works with Android, iOS and Web. It uses html5-qrcode js library for web and qr_code_scanner for Android and iOS

Note:

At present, this is the only flutter web plugin that support barcode scanning

Get Scanned QR/Bar Code #

When a QR code is recognized, the text identified will be set in 'result' of type Barcode, which contains the output text as property 'code' of type String and scanned code type as property 'format' which is an enum BarcodeFormat, defined in the library.

class _MyAppState extends State<MyApp> {

  final _qrBarCodeScannerDialogPlugin = QrBarCodeScannerDialog();
  String? code;

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Plugin example app'),
		),
		body: Builder(builder: (context) {
          return Material(
            child: Center(
              child: ElevatedButton(
                  onPressed: () {
                    _qrBarCodeScannerDialogPlugin.getScannedQrBarCode(
                        context: context,
						onCode: (code) {
                          setState(() {
                            this.code = code;
						  });
					 });
				  },
				  child: Text(code ?? "Click me")),
			  ),
		    );
		  }),
		 ),
	  );
	}
}

Android Integration #

In order to use this plugin, please update the Gradle, Kotlin and Kotlin Gradle Plugin:

In android/build.gradle change ext.kotlin_version = '1.3.50' to ext.kotlin_version = '1.5.10'

In android/build.gradle change classpath 'com.android.tools.build:gradle:3.5.0' to classpath 'com.android.tools.build:gradle:4.2.0'

In android/gradle/wrapper/gradle-wrapper.properties change distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.2-all.zip to distributionUrl=https\://services.gradle.org/distributions/gradle-6.9-all.zip

In android/app/build.gradle change defaultConfig{ ... minSdkVersion 16 } to defaultConfig{ ... minSdkVersion 20 }

Warning #

If you are using Flutter Beta or Dev channel (1.25 or 1.26) you can get the following error:

java.lang.AbstractMethodError: abstract method "void io.flutter.plugin.platform.PlatformView.onFlutterViewAttached(android.view.View)"

This is a bug in Flutter which is being tracked here: https://github.com/flutter/flutter/issues/72185

There is a workaround by adding android.enableDexingArtifactTransform=false to your gradle.properties file.

iOS Integration #

In order to use this plugin, add the following to your Info.plist file:

<key>io.flutter.embedded_views_preview</key>
<true/>
<key>NSCameraUsageDescription</key>
<string>This app needs camera access to scan QR codes</string>

Web Integration #

No need to update anything, plugin append the html contents to the DOM.