当然，以下是如何在Flutter项目中使用camera插件（注意，您提到的camera_camera_2可能是一个误写，Flutter社区中广泛使用的相机插件是camera）来实现相机功能的示例代码。

首先，确保在您的pubspec.yaml文件中添加了camera插件的依赖：

dependencies:
  flutter:
    sdk: flutter
  camera: ^0.14.5+3  # 请检查最新版本号并更新

然后，运行flutter pub get来安装依赖。

接下来，您需要在AndroidManifest.xml和Info.plist中添加必要的权限配置。

对于Android（在android/app/src/main/AndroidManifest.xml中添加）：

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.yourapp">

    <uses-permission android:name="android.permission.CAMERA" />
    <uses-feature android:name="android.hardware.camera" android:required="true" />
    <uses-feature android:name="android.hardware.camera.autofocus" />

    <application
        ...>
        <activity ...>
            ...
            <meta-data
                android:name="io.flutter.embedding.android.NormalTheme"
                android:resource="@style/NormalTheme" />
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

对于iOS（在ios/Runner/Info.plist中添加）：

<key>NSCameraUsageDescription</key>
<string>Need camera access</string>
<key>NSPhotoLibraryUsageDescription</key>
<string>Need photo library access</string>
<key>NSMicrophoneUsageDescription</key>
<string>Need microphone access</string>

接下来是Flutter代码部分，创建一个简单的相机应用：

import 'package:flutter/material.dart';
import 'package:camera/camera.dart';

List<CameraDescription> cameras;
CameraController? controller;

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Camera App',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  void initState() {
    super.initState();
    availableCameras().then((availableCameras) {
      cameras = availableCameras;

      if (cameras.isEmpty) {
        print('No cameras found');
        return;
      }

      // Use the first camera on the device.
      controller = CameraController(
        cameras[0],
        ResolutionPreset.medium,
      );

      controller!.initialize().then((_) {
        if (!mounted) {
          return;
        }
        setState(() {});
      });
    }).catchError((err) {
      print('Error: $err.code\n${err.message}');
    });
  }

  @override
  void dispose() {
    controller?.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    if (!controller!.value.isInitialized) {
      return Container();
    }
    return Scaffold(
      appBar: AppBar(
        title: Text('Camera'),
      ),
      body: Center(
        child: CameraPreview(controller!),
      ),
      floatingActionButton: FloatingActionButton(
        child: Icon(Icons.camera_alt),
        onPressed: () async {
          try {
            final XFile? picture = await controller!.takePicture();

            if (mounted) {
              setState(() {});
            }

            if (picture != null) {
              // Display the captured image
              showDialog(
                context: context,
                builder: (context) => AlertDialog(
                  content: Image.file(File(picture.path)),
                ),
              );
            }
          } catch (e) {
            print(e);
          }
        },
      ),
    );
  }
}

这个示例代码展示了如何使用camera插件来初始化相机、显示相机预览以及拍摄照片。注意，您需要在运行应用之前确保设备上有可用的相机，并且已经授予了必要的权限。