barcode scanner for mobile/web and window

Author: CodingWithTashi

example/android/app/build.gradle

@@ -47,7 +47,7 @@ android {
         applicationId "com.kharagedition.example"
         // You can update the following values to match your application needs.
         // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-build-configuration.
-        minSdkVersion flutter.minSdkVersion
+        minSdkVersion 19
         targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName

example/android/app/src/main/AndroidManifest.xml

@@ -1,5 +1,6 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.kharagedition.example">
+    <uses-permission android:name="android.permission.CAMERA" />
    <application
         android:label="example"
         android:name="${applicationName}"

example/lib/main.dart

@@ -1,4 +1,6 @@
 import 'package:flutter/material.dart';
+import 'package:simple_barcode_scanner/simple_barcode_scanner.dart';
+import 'package:webview_flutter/webview_flutter.dart';
 
 void main() {
   runApp(const MyApp());
@@ -13,103 +15,47 @@ class MyApp extends StatelessWidget {
     return MaterialApp(
       title: 'Flutter Demo',
       theme: ThemeData(
-        // This is the theme of your application.
-        //
-        // Try running your application with "flutter run". You'll see the
-        // application has a blue toolbar. Then, without quitting the app, try
-        // changing the primarySwatch below to Colors.green and then invoke
-        // "hot reload" (press "r" in the console where you ran "flutter run",
-        // or simply save your changes to "hot reload" in a Flutter IDE).
-        // Notice that the counter didn't reset back to zero; the application
-        // is not restarted.
         primarySwatch: Colors.blue,
       ),
-      home: const MyHomePage(title: 'Flutter Demo Home Page'),
+      home: const HomePage(),
     );
   }
 }
 
-class MyHomePage extends StatefulWidget {
-  const MyHomePage({Key? key, required this.title}) : super(key: key);
-
-  // This widget is the home page of your application. It is stateful, meaning
-  // that it has a State object (defined below) that contains fields that affect
-  // how it looks.
-
-  // This class is the configuration for the state. It holds the values (in this
-  // case the title) provided by the parent (in this case the App widget) and
-  // used by the build method of the State. Fields in a Widget subclass are
-  // always marked "final".
-
-  final String title;
+class HomePage extends StatefulWidget {
+  const HomePage({Key? key}) : super(key: key);
 
   @override
-  State<MyHomePage> createState() => _MyHomePageState();
+  State<HomePage> createState() => _HomePageState();
 }
 
-class _MyHomePageState extends State<MyHomePage> {
-  int _counter = 0;
-
-  void _incrementCounter() {
-    setState(() {
-      // This call to setState tells the Flutter framework that something has
-      // changed in this State, which causes it to rerun the build method below
-      // so that the display can reflect the updated values. If we changed
-      // _counter without calling setState(), then the build method would not be
-      // called again, and so nothing would appear to happen.
-      _counter++;
-    });
-  }
-
+class _HomePageState extends State<HomePage> {
+  String result = '';
   @override
   Widget build(BuildContext context) {
-    // This method is rerun every time setState is called, for instance as done
-    // by the _incrementCounter method above.
-    //
-    // The Flutter framework has been optimized to make rerunning build methods
-    // fast, so that you can just rebuild anything that needs updating rather
-    // than having to individually change instances of widgets.
     return Scaffold(
-      appBar: AppBar(
-        // Here we take the value from the MyHomePage object that was created by
-        // the App.build method, and use it to set our appbar title.
-        title: Text(widget.title),
-      ),
       body: Center(
-        // Center is a layout widget. It takes a single child and positions it
-        // in the middle of the parent.
         child: Column(
-          // Column is also a layout widget. It takes a list of children and
-          // arranges them vertically. By default, it sizes itself to fit its
-          // children horizontally, and tries to be as tall as its parent.
-          //
-          // Invoke "debug painting" (press "p" in the console, choose the
-          // "Toggle Debug Paint" action from the Flutter Inspector in Android
-          // Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
-          // to see the wireframe for each widget.
-          //
-          // Column has various properties to control how it sizes itself and
-          // how it positions its children. Here we use mainAxisAlignment to
-          // center the children vertically; the main axis here is the vertical
-          // axis because Columns are vertical (the cross axis would be
-          // horizontal).
-          mainAxisAlignment: MainAxisAlignment.center,
-          children: <Widget>[
-            const Text(
-              'You have pushed the button this many times:',
-            ),
-            Text(
-              '$_counter',
-              style: Theme.of(context).textTheme.headline4,
-            ),
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            ElevatedButton(
+                onPressed: () async {
+                  var res = await Navigator.push(
+                      context,
+                      MaterialPageRoute(
+                        builder: (context) => const SimpleBarcodeScannerPage(),
+                      ));
+                  setState(() {
+                    if (res is String) {
+                      result = res;
+                    }
+                  });
+                },
+                child: const Text('Open Scanner')),
+            Text('Barcode Result: $result'),
           ],
         ),
       ),
-      floatingActionButton: FloatingActionButton(
-        onPressed: _incrementCounter,
-        tooltip: 'Increment',
-        child: const Icon(Icons.add),
-      ), // This trailing comma makes auto-formatting nicer for build methods.
     );
   }
 }

example/pubspec.lock

@@ -62,13 +62,27 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  flutter_barcode_scanner:
+    dependency: transitive
+    description:
+      name: flutter_barcode_scanner
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.0"
   flutter_lints:
     dependency: "direct dev"
     description:
       name: flutter_lints
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.0.1"
+  flutter_plugin_android_lifecycle:
+    dependency: transitive
+    description:
+      name: flutter_plugin_android_lifecycle
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.6"
   flutter_test:
     dependency: "direct dev"
     description: flutter
@@ -109,6 +123,20 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.8.1"
+  plugin_platform_interface:
+    dependency: transitive
+    description:
+      name: plugin_platform_interface
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.1.2"
+  simple_barcode_scanner:
+    dependency: "direct main"
+    description:
+      path: ".."
+      relative: true
+    source: path
+    version: "0.0.1"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -163,5 +191,41 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.1.2"
+  webview_flutter:
+    dependency: "direct main"
+    description:
+      name: webview_flutter
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.0.4"
+  webview_flutter_android:
+    dependency: transitive
+    description:
+      name: webview_flutter_android
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.8.8"
+  webview_flutter_platform_interface:
+    dependency: transitive
+    description:
+      name: webview_flutter_platform_interface
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.9.0"
+  webview_flutter_wkwebview:
+    dependency: transitive
+    description:
+      name: webview_flutter_wkwebview
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.7.5"
+  webview_windows:
+    dependency: transitive
+    description:
+      name: webview_windows
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.1.9"
 sdks:
   dart: ">=2.17.0 <3.0.0"
+  flutter: ">=2.5.0"

example/pubspec.yaml

@@ -31,6 +31,7 @@ dependencies:
     sdk: flutter
   simple_barcode_scanner:
     path: ../
+  webview_flutter: ^3.0.4
 
 
   # The following adds the Cupertino Icons font to your application.
@@ -61,8 +62,7 @@ flutter:
 
   # To add assets to your application, add an assets section, like this:
   # assets:
-  #   - images/a_dot_burr.jpeg
-  #   - images/a_dot_ham.jpeg
+  #  - assets/barcode.html
 
   # An image asset can refer to one or more resolution-specific "variants", see
   # https://flutter.dev/assets-and-images/#resolution-aware

example/windows/flutter/generated_plugin_registrant.cc

@@ -6,6 +6,9 @@
 
 #include "generated_plugin_registrant.h"
 
+#include <webview_windows/webview_windows_plugin.h>
 
 void RegisterPlugins(flutter::PluginRegistry* registry) {
+  WebviewWindowsPluginRegisterWithRegistrar(
+      registry->GetRegistrarForPlugin("WebviewWindowsPlugin"));
 }

example/windows/flutter/generated_plugins.cmake

@@ -3,6 +3,7 @@
 #
 
 list(APPEND FLUTTER_PLUGIN_LIST
+  webview_windows
 )
 
 list(APPEND FLUTTER_FFI_PLUGIN_LIST

lib/assets/barcode.html

@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <title></title>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <style>
+         /* In order to place the tracking correctly */
+         canvas.drawing, canvas.drawingBuffer {
+         position: absolute;
+         left: 0;
+         top: 0;
+         }
+         html, body {
+         height: 100%; /* IMPORTANT!!! Stretches viewport to 100% */
+         }
+      </style>
+    <script src="html5-qrcode.min.js"></script>
+</head>
+<body>
+<!-- Div to show the scanner -->
+<div id="reader" ></div>
+<script>
+         const html5QrCode = new Html5Qrcode("reader");
+         console.log("Starting SCANNGING CODE");
+         const qrCodeSuccessCallback = (decodedText, decodedResult) => {
+             /* handle success for web */
+             window.parent.postMessage(decodedText, "*");
+
+             /* handle success for window */
+             var param = {
+             "methodName":"submitCallback",
+             "data":decodedText
+             }
+             submitCallback(JSON.stringify(param));
+         };
+         const config = { fps: 10, qrbox:  { width: 280, height: 120 } };
+
+         // If you want to prefer back camera
+         html5QrCode.start({ facingMode: "environment" }, config, qrCodeSuccessCallback);
+         //html5QrCode.start({ facingMode: "user" }, config, qrCodeSuccessCallback);
+
+
+      </script>
+</body>
+</html>

lib/assets/html5-qrcode.min.js

@@ -0,0 +1,6 @@
+class PackageConstant {
+  static const barcodeFilePath =
+      "packages/simple_barcode_scanner/assets/barcode.html";
+  static const barcodeFileWebPath =
+      "assets/packages/simple_barcode_scanner/assets/barcode.html";
+}