CameraPage + Preview Page done

app/allergy/lib/screens/cameraPage.dart

@@ -1,17 +1,114 @@
 import 'package:camera/camera.dart';
+import 'package:flutter/material.dart';
 import 'package:flutter/src/widgets/framework.dart';
 import 'package:flutter/src/widgets/placeholder.dart';
 
 class CameraPage extends StatefulWidget {
-  const CameraPage({super.key, this.cameras});
-  final List<CameraDescription>? cameras;
+  const CameraPage((Key?key, required this.cameras)) : super(key: key);
+
+  final ListCameraDescription>? cameras;
+
   @override
-  State<CameraPage> createState() => _CameraPageState();
+State<CameraPage> createState() => _CameraPageState();
 }
 
 class _CameraPageState extends State<CameraPage> {
+  late CameraController _cameraController;
+  bool _isRearCameraSelected = true;
+
   @override
+  void dispose() {
+    _cameraController.dispose();
+    super.dispose();
+  }
+
+  @override
+  void initState() {
+    super.initState();
+    initCamera(widget.cameras![0]);
+  }
+
+  Future takePicture() async {
+    if (!_cameraController.value.isInitialized) {
+      return null;
+    }
+    if (_cameraController.value.isTakingPicture) {
+      return null;
+    }
+    try {
+      await _cameraController.setFlashMode(FlashMode.off);
+      XFile picture = await _cameraController.takePicture();
+      Navigator.push(
+          context,
+          MaterialPageRoute(
+              builder: (context) => PreviewPage(
+                    picture: picture,
+                  )));
+    } on CameraException catch (e) {
+      debugPrint('Error occured while taking picture: $e');
+      return null;
+    }
+  }
+
+  Future initCamera(CameraDescription,cameraDescription) async {
+    _cameraController =
+        CameraController(cameraDescription, ResolutionPreset.high);
+    try {
+      await _cameraController.initialize().then((_) {
+        if (!mounted) return;
+        setState(() {});
+      });
+    } on CameraException catch (e) {
+      debugPrint("Camera Error $e");
+    }
+  }
+
+    @override
   Widget build(BuildContext context) {
-    return const Placeholder();
+    return Scaffold(
+        body: SafeArea(
+      child: Stack(children: [
+        (_cameraController.value.isInitialized)
+            ? CameraPreview(_cameraController)
+            : Container(
+                color: Colors.black,
+                child: const Center(child: CircularProgressIndicator())),
+        Align(
+            alignment: Alignment.bottomCenter,
+            child: Container(
+              height: MediaQuery.of(context).size.height * 0.20,
+              decoration: const BoxDecoration(
+                  borderRadius: BorderRadius.vertical(top: Radius.circular(24)),
+                  color: Colors.black),
+              child:
+                  Row(crossAxisAlignment: CrossAxisAlignment.center, children: [
+                Expanded(
+                    child: IconButton(
+                  padding: EdgeInsets.zero,
+                  iconSize: 30,
+                  icon: Icon(
+                      _isRearCameraSelected
+                          ? CupertinoIcons.switch_camera
+                          : CupertinoIcons.switch_camera_solid,
+                      color: Colors.white),
+                  onPressed: () {
+                    setState(
+                        () => _isRearCameraSelected = !_isRearCameraSelected);
+                    initCamera(widget.cameras![_isRearCameraSelected ? 0 : 1]);
+                  },
+                )),
+                Expanded(
+                    child: IconButton(
+                  onPressed: takePicture,
+                  iconSize: 50,
+                  padding: EdgeInsets.zero,
+                  constraints: const BoxConstraints(),
+                  icon: const Icon(Icons.circle, color: Colors.white),
+                )),
+                const Spacer(),
+              ]),
+            )),
+      ]),
+    ));
   }
-}
+}

app/allergy/lib/screens/preview_page.dart

@@ -0,0 +1,23 @@
+import 'package:camera/camera.dart';
+import 'package:flutter/material.dart';
+import 'dart:io';
+
+class PreviewPage extends StatelessWidget {
+  const PreviewPage({Key? key, required this.picture}) : super(key: key);
+
+  final XFile picture;
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: const Text('Preview Page')),
+      body: Center(
+        child: Column(mainAxisSize: MainAxisSize.min, children: [
+          Image.file(File(picture.path), fit: BoxFit.cover, width: 250),
+          const SizedBox(height: 24),
+          Text(picture.name)
+        ]),
+      ),
+    );
+  }
+}