1507: add concrete camera resolution for specific model to fix qr code scanning

Author: f1sh1918

frontend/lib/identification/qr_code_scanner/qr_code_scanner.dart

@@ -8,6 +8,8 @@ import 'package:mobile_scanner/mobile_scanner.dart';
 
 import 'package:ehrenamtskarte/l10n/translations.g.dart';
 
+import 'package:ehrenamtskarte/util/android_utils.dart';
+
 typedef OnCodeScannedCallback = Future<void> Function(Uint8List code);
 
 class QrCodeScanner extends StatefulWidget {
@@ -20,12 +22,29 @@ class QrCodeScanner extends StatefulWidget {
 }
 
 class _QRViewState extends State<QrCodeScanner> {
+  bool _hasCameraIssues = false;
+
+  @override
+  void initState() {
+    super.initState();
+    // Workaround for https://github.com/juliansteenbakker/mobile_scanner/issues/698
+    // Check once the qr code scanner was initialized if the device has camera issues
+    // Depending on that set a controller with predefined camera solution to fix that qr code reading issues
+    WidgetsBinding.instance.addPostFrameCallback((_) async {
+      setState(() async {
+        _hasCameraIssues = await isDeviceWithCameraIssues();
+      });
+    });
+  }
+
   final MobileScannerController _controller = MobileScannerController(
-    torchEnabled: false,
-    detectionSpeed: DetectionSpeed.normal,
-    formats: [BarcodeFormat.qrCode],
-    returnImage: false,
-  );
+      torchEnabled: false, detectionSpeed: DetectionSpeed.normal, formats: [BarcodeFormat.qrCode], returnImage: false);
+  final MobileScannerController _controllerCameraResolution = MobileScannerController(
+      torchEnabled: false,
+      detectionSpeed: DetectionSpeed.normal,
+      formats: [BarcodeFormat.qrCode],
+      returnImage: false,
+      cameraResolution: const Size(640, 480));
   final GlobalKey qrKey = GlobalKey(debugLabel: 'QR');
 
   // Determines whether a code is currently processed by the onCodeScanned callback
@@ -37,7 +56,7 @@ class _QRViewState extends State<QrCodeScanner> {
   @override
   Widget build(BuildContext context) {
     final t = context.t;
-    final controller = _controller;
+    final controller = _hasCameraIssues ? _controllerCameraResolution : _controller;
     return Stack(
       children: [
         Column(

frontend/lib/main.dart

@@ -5,7 +5,7 @@ import 'package:ehrenamtskarte/configuration/definitions.dart';
 import 'package:ehrenamtskarte/l10n/translations.g.dart';
 import 'package:ehrenamtskarte/sentry.dart';
 import 'package:ehrenamtskarte/settings_provider.dart';
-import 'package:ehrenamtskarte/util/android_certificate.dart';
+import 'package:ehrenamtskarte/util/android_utils.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:slang/builder/model/enums.dart';

frontend/lib/util/android_certificate.dart renamed to frontend/lib/util/android_utils.dart

@@ -12,3 +12,13 @@ Future<bool> certificateIsRequired() async {
   AndroidDeviceInfo androidInfo = await deviceInfo.androidInfo;
   return androidInfo.version.sdkInt < 25;
 }
+
+Future<bool> isDeviceWithCameraIssues() async {
+  if (!Platform.isAndroid) {
+    return false;
+  }
+  List<String> devicesWithoutQRCodeDetection = ['SM-A236B'];
+  DeviceInfoPlugin deviceInfo = DeviceInfoPlugin();
+  AndroidDeviceInfo androidInfo = await deviceInfo.androidInfo;
+  return devicesWithoutQRCodeDetection.contains(androidInfo.model);
+}