【Flutter/Dart】カメラを開く

dependencies:
  flutter:
    sdk: flutter
  image_picker: ^0.8.4+3 // 追加

import 'dart:io';
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: CameraScreen(),
    );
  }
}

class CameraScreen extends StatefulWidget {
  @override
  _CameraScreenState createState() => _CameraScreenState();
}

class _CameraScreenState extends State<CameraScreen> {
  File? _image;

  Future<void> _takePicture() async {
    final picker = ImagePicker();
    final pickedFile = await picker.getImage(source: ImageSource.camera);

    setState(() {
      if (pickedFile != null) {
        _image = File(pickedFile.path);
      } else {
        print('No image selected.');
      }
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Camera Example'),
      ),
      body: Center(
        child:
            _image == null ? Text('No image selected.') : Image.file(_image!),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _takePicture,
        tooltip: 'Take Picture',
        child: Icon(Icons.camera_alt),
      ),
    );
  }
}