show black screen if camera not found

example/android/build.gradle

@@ -1,12 +1,12 @@
 buildscript {
-    ext.kotlin_version = '1.6.10'
+    ext.kotlin_version = '1.6.21'
     repositories {
         google()
         mavenCentral()
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.1.0'
+        classpath 'com.android.tools.build:gradle:7.2.1'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }

example/android/gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Fri Jun 23 08:50:38 CEST 2017
+#Sat Jun 18 18:28:03 AMT 2022
 distributionBase=GRADLE_USER_HOME
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.4.2-bin.zip
 distributionPath=wrapper/dists
-zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.7-all.zip
+zipStoreBase=GRADLE_USER_HOME

example/pubspec.lock

@@ -28,21 +28,7 @@ packages:
       name: camera
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.9.8"
-  camera_android:
-    dependency: transitive
-    description:
-      name: camera_android
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.9.7+1"
-  camera_avfoundation:
-    dependency: transitive
-    description:
-      name: camera_avfoundation
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.9.7+1"
+    version: "0.9.7"
   camera_platform_interface:
     dependency: transitive
     description:
@@ -112,7 +98,7 @@ packages:
       name: ffi
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.2.1"
+    version: "2.0.0"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -197,7 +183,7 @@ packages:
       name: image_picker_android
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.8.5"
+    version: "0.8.5+1"
   image_picker_for_web:
     dependency: transitive
     description:

ios/Classes/src/native_zxing.cpp

@@ -52,6 +52,7 @@ extern "C"
             size_t size = (wcslen(resultText) + 1) * sizeof(wchar_t);
             code.text = new char[size];
             std::wcstombs(code.text, resultText, size);
+            platform_log("zxingRead: %ls", resultText);
         }
 
         int evalInMillis = static_cast<int>(get_now() - start);
@@ -98,6 +99,7 @@ extern "C"
                 
                 codes[i] = code;
                 i++;
+                platform_log("zxingRead: %s", code.text);
             }
         }
 

lib/src/ui/reader_widget.dart

@@ -199,17 +199,16 @@ class _ReaderWidgetState extends State<ReaderWidget>
   // Display the preview from the camera.
   Widget _cameraPreviewWidget(double cropSize) {
     final CameraController? cameraController = controller;
-    if (cameras != null && (cameras?.isEmpty ?? false)) {
-      return const Text('No cameras found');
-    } else if (cameraController == null ||
-        !cameraController.value.isInitialized ||
-        !_cameraOn) {
-      return const CircularProgressIndicator();
-    } else {
-      final Size size = MediaQuery.of(context).size;
-      final double cameraMaxSize = max(size.width, size.height);
-      return Stack(
-        children: <Widget>[
+    final bool isCameraReady = cameras != null &&
+        (cameras?.isNotEmpty ?? false) &&
+        _cameraOn &&
+        !(cameraController == null || !cameraController.value.isInitialized);
+    final Size size = MediaQuery.of(context).size;
+    final double cameraMaxSize = max(size.width, size.height);
+    return Stack(
+      children: <Widget>[
+        if (!isCameraReady) Container(color: Colors.black),
+        if (isCameraReady)
           SizedBox(
             width: cameraMaxSize,
             height: cameraMaxSize,
@@ -227,37 +226,38 @@ class _ReaderWidgetState extends State<ReaderWidget>
               ),
             ),
           ),
-          if (widget.showCroppingRect)
-            Container(
-              decoration: ShapeDecoration(
-                shape: widget.scannerOverlay ??
-                    ScannerOverlay(
-                      borderColor: Theme.of(context).primaryColor,
-                      overlayColor: Colors.black45,
-                      borderRadius: 1,
-                      borderLength: 16,
-                      borderWidth: 8,
-                      cutOutSize: cropSize,
-                    ),
-              ),
-            ),
-          if (widget.allowPinchZoom)
-            GestureDetector(
-              onScaleStart: (ScaleStartDetails details) {
-                _zoom = _scaleFactor;
-              },
-              onScaleUpdate: (ScaleUpdateDetails details) {
-                _scaleFactor =
-                    (_zoom * details.scale).clamp(_minZoomLevel, _maxZoomLevel);
-                cameraController.setZoomLevel(_scaleFactor);
-              },
+        if (widget.showCroppingRect)
+          Container(
+            decoration: ShapeDecoration(
+              shape: widget.scannerOverlay ??
+                  ScannerOverlay(
+                    borderColor: Theme.of(context).primaryColor,
+                    overlayColor: Colors.black45,
+                    borderRadius: 1,
+                    borderLength: 16,
+                    borderWidth: 8,
+                    cutOutSize: cropSize,
+                  ),
             ),
-          if (widget.showFlashlight)
-            Positioned(
-              bottom: 20,
-              left: 20,
-              child: FloatingActionButton(
-                onPressed: () {
+          ),
+        if (widget.allowPinchZoom)
+          GestureDetector(
+            onScaleStart: (ScaleStartDetails details) {
+              _zoom = _scaleFactor;
+            },
+            onScaleUpdate: (ScaleUpdateDetails details) {
+              _scaleFactor =
+                  (_zoom * details.scale).clamp(_minZoomLevel, _maxZoomLevel);
+              cameraController?.setZoomLevel(_scaleFactor);
+            },
+          ),
+        if (widget.showFlashlight)
+          Positioned(
+            bottom: 20,
+            left: 20,
+            child: FloatingActionButton(
+              onPressed: () {
+                if (cameraController != null) {
                   FlashMode mode = cameraController.value.flashMode;
                   if (mode == FlashMode.torch) {
                     mode = FlashMode.off;
@@ -266,18 +266,18 @@ class _ReaderWidgetState extends State<ReaderWidget>
                   }
                   cameraController.setFlashMode(mode);
                   setState(() {});
-                },
-                backgroundColor: Colors.black26,
-                child: Icon(_flashIcon(cameraController)),
-              ),
-            )
-        ],
-      );
-    }
+                }
+              },
+              backgroundColor: Colors.black26,
+              child: Icon(_flashIcon(cameraController)),
+            ),
+          )
+      ],
+    );
   }
 
-  IconData _flashIcon(CameraController cameraController) {
-    final FlashMode mode = cameraController.value.flashMode;
+  IconData _flashIcon(CameraController? cameraController) {
+    final FlashMode mode = cameraController?.value.flashMode ?? FlashMode.torch;
     switch (mode) {
       case FlashMode.torch:
         return Icons.flash_on;

pubspec.yaml

@@ -9,7 +9,7 @@ environment:
 
 dependencies:
   camera: ^0.9.7
-  ffi: ^1.2.1
+  ffi: ^2.0.0
   flutter:
     sdk: flutter
   flutter_beep: ^1.0.0

zxscanner/pubspec.lock

@@ -98,28 +98,14 @@ packages:
       name: built_value
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "8.3.2"
+    version: "8.3.3"
   camera:
     dependency: transitive
     description:
       name: camera
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.9.8"
-  camera_android:
-    dependency: transitive
-    description:
-      name: camera_android
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.9.7+1"
-  camera_avfoundation:
-    dependency: transitive
-    description:
-      name: camera_avfoundation
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.9.7+1"
+    version: "0.9.7"
   camera_platform_interface:
     dependency: transitive
     description:
@@ -231,7 +217,7 @@ packages:
       name: ffi
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.2.1"
+    version: "2.0.0"
   file:
     dependency: transitive
     description:
@@ -297,7 +283,7 @@ packages:
       name: flutter_native_splash
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.2.3"
+    version: "2.2.3+1"
   flutter_plugin_android_lifecycle:
     dependency: transitive
     description:
@@ -342,7 +328,7 @@ packages:
       name: glob
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.2"
+    version: "2.1.0"
   graphs:
     dependency: transitive
     description:
@@ -384,7 +370,7 @@ packages:
       name: http_multi_server
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "3.2.0"
+    version: "3.2.1"
   http_parser:
     dependency: transitive
     description:
@@ -419,7 +405,7 @@ packages:
       name: image_picker_android
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.8.5"
+    version: "0.8.5+1"
   image_picker_for_web:
     dependency: transitive
     description:
@@ -531,7 +517,7 @@ packages:
       name: mobx
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.7+2"
+    version: "2.0.7+3"
   mobx_codegen:
     dependency: "direct dev"
     description:
@@ -545,7 +531,7 @@ packages:
       name: package_config
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.2"
+    version: "2.1.0"
   path:
     dependency: transitive
     description:
@@ -566,14 +552,14 @@ packages:
       name: path_provider_android
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.14"
+    version: "2.0.15"
   path_provider_ios:
     dependency: transitive
     description:
       name: path_provider_ios
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.9"
+    version: "2.0.10"
   path_provider_linux:
     dependency: transitive
     description:
@@ -601,7 +587,7 @@ packages:
       name: path_provider_windows
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.7"
+    version: "2.1.0"
   petitparser:
     dependency: transitive
     description:
@@ -629,7 +615,7 @@ packages:
       name: pool
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.5.0"
+    version: "1.5.1"
   process:
     dependency: transitive
     description:
@@ -664,7 +650,7 @@ packages:
       name: share_plus
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "4.0.7"
+    version: "4.0.8"
   share_plus_linux:
     dependency: transitive
     description:
@@ -762,14 +748,14 @@ packages:
       name: shelf
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.3.0"
+    version: "1.3.1"
   shelf_web_socket:
     dependency: transitive
     description:
       name: shelf_web_socket
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.1"
+    version: "1.0.2"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -900,14 +886,14 @@ packages:
       name: url_launcher_platform_interface
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.5"
+    version: "2.1.0"
   url_launcher_web:
     dependency: transitive
     description:
       name: url_launcher_web
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.11"
+    version: "2.0.12"
   url_launcher_windows:
     dependency: transitive
     description:
@@ -942,7 +928,7 @@ packages:
       name: win32
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.6.1"
+    version: "2.7.0"
   xdg_directories:
     dependency: transitive
     description:

zxscanner/pubspec.yaml

@@ -16,7 +16,7 @@ dependencies:
   flutter_localizations:
     sdk: flutter
   flutter_markdown: ^0.6.10
-  flutter_mobx: ^2.0.5
+  flutter_mobx: ^2.0.6
   flutter_zxing:
     path: ../
   font_awesome_flutter: ^10.1.0
@@ -27,7 +27,7 @@ dependencies:
   intl: ^0.17.0
   mobx: ^2.0.7
   path_provider: ^2.0.11
-  share_plus: ^4.0.7
+  share_plus: ^4.0.8
   shared_preferences: ^2.0.15
   url_launcher: ^6.1.3
 
@@ -38,7 +38,7 @@ flutter_intl:
 dev_dependencies:
   build_runner: ^2.1.11
   flutter_lints: ^2.0.1
-  flutter_native_splash: ^2.2.2 # flutter pub run flutter_native_splash:create
+  flutter_native_splash: ^2.2.3 # flutter pub run flutter_native_splash:create
   flutter_test:
     sdk: flutter
   hive_generator: