updated example

example/lib/main.dart

@@ -1,3 +1,5 @@
+import 'dart:typed_data';
+
 import 'package:flutter/material.dart';
 import 'package:flutter_zxing/flutter_zxing.dart';
 
@@ -16,9 +18,26 @@ class _MyAppState extends State<MyApp> {
   @override
   Widget build(BuildContext context) {
     FlutterZxing.setLogEnabled(true);
-    return MaterialApp(
+    return const MaterialApp(
       title: 'Flutter Zxing Example',
-      home: DefaultTabController(
+      home: DemoPage(),
+    );
+  }
+}
+
+class DemoPage extends StatefulWidget {
+  const DemoPage({Key? key}) : super(key: key);
+
+  @override
+  State<DemoPage> createState() => _DemoPageState();
+}
+
+class _DemoPageState extends State<DemoPage> {
+  Uint8List? createdCodeBytes;
+
+  @override
+  Widget build(BuildContext context) {
+    return DefaultTabController(
       length: 2,
       child: Scaffold(
         appBar: AppBar(
@@ -35,16 +54,37 @@ class _MyAppState extends State<MyApp> {
           children: [
             ReaderWidget(
               onScan: (value) {
-                  debugPrint(value.textString ?? '');
+                showMessage(context, 'Scanned: ${value.textString ?? ''}');
               },
             ),
+            ListView(
+              children: [
                 WriterWidget(
-                onSuccess: (result, bytes) {},
-                onError: (error) {},
+                  onSuccess: (result, bytes) {
+                    setState(() {
+                      createdCodeBytes = bytes;
+                    });
+                  },
+                  onError: (error) {
+                    showMessage(context, 'Error: $error');
+                  },
+                ),
+                if (createdCodeBytes != null)
+                  Image.memory(createdCodeBytes ?? Uint8List(0), height: 200),
+              ],
             ),
           ],
         ),
       ),
+    );
+  }
+
+  showMessage(BuildContext context, String message) {
+    debugPrint(message);
+    ScaffoldMessenger.of(context).hideCurrentSnackBar();
+    ScaffoldMessenger.of(context).showSnackBar(
+      SnackBar(
+        content: Text(message),
       ),
     );
   }

lib/reader_widget.dart

@@ -39,7 +39,7 @@ class ReaderWidget extends StatefulWidget {
 
 class _ReaderWidgetState extends State<ReaderWidget>
     with TickerProviderStateMixin {
-  late List<CameraDescription> cameras;
+  List<CameraDescription>? cameras;
   CameraController? controller;
 
   bool isAndroid() => Theme.of(context).platform == TargetPlatform.android;
@@ -195,7 +195,10 @@ class _ReaderWidgetState extends State<ReaderWidget>
   // Display the preview from the camera.
   Widget _cameraPreviewWidget(double cropSize) {
     final CameraController? cameraController = controller;
-    if (cameraController == null || !cameraController.value.isInitialized) {
+    if (cameras != null && cameras?.isEmpty == true) {
+      return const Text('No cameras found');
+    } else if (cameraController == null ||
+        !cameraController.value.isInitialized) {
       return const CircularProgressIndicator();
     } else {
       final size = MediaQuery.of(context).size;

lib/writer_widget.dart

@@ -170,7 +170,7 @@ class _WriterWidgetState extends State<WriterWidget>
                 onPressed: createBarcode,
                 child: const Text('Create'),
               ),
-              const SizedBox(height: 20),
+              const SizedBox(height: 10),
             ],
           ),
         ),
@@ -202,7 +202,6 @@ class _WriterWidgetState extends State<WriterWidget>
         error = result.errorMessage;
       }
       if (error != null) {
-        debugPrint(error);
         widget.onError?.call(error);
       }
     }