비둘기 박제창 (@Dreamwalker) 1

2 Pigeons and papyrus at Amarna: the birds of the Green Room revisited Christopher M. Stimpson1,* & Barry J. Kemp2,*

Flutter Multi-Platform Mobile Bring your app idea to more users from day one by building with Flutter on iOS and Android simultaneously, without sacrificing features, quality, or performance. Android iOS Web Easily reach more users in browsers with the same experience as on mobile devices through the power of Flutter on the web. Chrome etc.. Desktop & Embedded Build high-quality desktop apps without compromising compatibility or performance. Flutter's support for custom embedders means you can create new ways to put Flutter to work on the platforms that matter to you. Windows macOS Linux 3

Platform integration Flutter Communication with host 4 @source: https://medium.com/flutter/flutter-platform-channels-ce7f540a104e

type-safe? 5

Pigeon is a code generator tool to make communication between Flutter and the host platform type-safe, easier, and faster. ● Pigeon removes the necessity to manage strings across multiple platforms and languages. ● It also improves efficiency over common method channel patterns. ● Most importantly though, it removes the need to write custom platform channel code, since pigeon generates it for you. Code Generator tool Pigeon 6

Currently pigeon supports generating: ● Kotlin and Java code for Android ● Swift and Objective-C code for iOS and macOS ● C++ code for Windows Supported Platforms Pigeon 7

Pigeon Code Generator tool 8 .dart file Flutter App iOS Host Android Host Desktop Host Dart Objective-C Swift Java, Kotlin Pigeon 🕊

9 https://github.com/flutter/packages/blob/main/packages/pigeon/doc/pigeon_state.png

10 https://pub.dev/packages/pigeon https://github.com/flutter/packages/tree/main/packages/pige on

Flutterfire 11

video_player 12

Installing Add pigeon as a dev_dependency 13

@HostApi() abstract class SimpleHostApi { String getHostLanguage(); } 14

class MessageData { String? name; Code code; Map data; MessageData({required this.code, required this.data}); } 15 @HostApi() abstract class SimpleHostApi { bool sendMessage(MessageData message); }

Pigeon @HostApi Flutter에서 호스트 플랫폼을 호출하고 싶을때 사용 @FlutterApi 호스트 플랫폼에서 Flutter 앱을 호출하고 싶을때 사용 16

dart run pigeon \ --input pigeons/messaging.dart \ --dart_out lib/pigeon.dart \ --objc_header_out ios/Runner/pigeon.h \ --objc_source_out ios/Runner/pigeon.m \ --java_out ./android/app/src/main/java/com/example/xxxx/Pigeon.java \ --java_package "com.example.xxxx" 17

@ConfigurePigeon(PigeonOptions( dartOut: 'lib/src/messages.g.dart', dartOptions: DartOptions(), cppOptions: CppOptions(namespace: 'pigeon_example'), cppHeaderOut: 'windows/runner/messages.g.h', cppSourceOut: 'windows/runner/messages.g.cpp', kotlinOut: 'android/app/src/main/kotlin/com/dreamwalker/flutter_pigeon/Messages.g.kt', kotlinOptions: KotlinOptions(), javaOut: 'android/app/src/main/java/io/flutter/plugins/Messages.java', javaOptions: JavaOptions(), swiftOut: 'ios/Runner/Messages.g.swift', swiftOptions: SwiftOptions(), objcHeaderOut: 'macos/Runner/messages.g.h', objcSourceOut: 'macos/Runner/messages.g.m', objcOptions: ObjcOptions(prefix: 'PGN'), copyrightHeader: 'pigeons/copyright.txt', dartPackageName: 'pigeon_example', )) 18

dart run pigeon --input ./pigeons/message.dart 19

20 Future getHostLanguage() async { final BasicMessageChannel channel = BasicMessageChannel( 'dev.flutter.pigeon.pigeon_example.SimpleHostApi.getHostLanguage', codec, binaryMessenger: _binaryMessenger); final List? replyList = await channel.send(null) as List?; if (replyList == null) { throw PlatformException( code: 'channel-error', message: 'Unable to establish connection on channel.', ); } /// else if else { return (replyList[0] as String?)!; } }

21 class MainActivity : FlutterActivity() { override fun configureFlutterEngine(flutterEngine: FlutterEngine) { super.configureFlutterEngine(flutterEngine) val api = PigeonApiImplementation() SimpleHostApi.setUp(flutterEngine.dartExecutor.binaryMessenger, api); } }

22 @UIApplicationMain @objc class AppDelegate: FlutterAppDelegate { override func application( _ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]? ) -> Bool { GeneratedPluginRegistrant.register(with: self) let controller = window?.rootViewController as! FlutterViewController let api = PigeonApiImplementation() ExampleHostApiSetup.setUp(binaryMessenger: controller.binaryMessenger, api: api) return super.application(application, didFinishLaunchingWithOptions: launchOptions) } }

23 private class PigeonApiImplementation: SimpleHostApi { override fun getHostLanguage(): String { return "Kotlin" } override fun sendMessage(message: MessageData, callback: (Result) -> Unit) { if (message.code == Code.ONE) { callback(Result.failure(FlutterError("code", "message", "details"))) return } callback(Result.success(true)) } }

24 private class PigeonApiImplementation: SimpleHostApi { func getHostLanguage() throws -> String { return "Swift" } func sendMessage(message: MessageData, completion: @escaping (Result) -> Void) { if (message.code == Code.one) { completion(.failure(FlutterError(code: "code", message: "message", details: "details"))) return } completion(.success(true)) } }

25 ElevatedButton( onPressed: () async { final host = await ExampleHostApi().getHostLanguage(); // custom code.. }, child: Text("호스트 정보"), )

● Pigeon is a code generator tool to make communication between Flutter and the host platform ● type-safe ○ Kotlin and Java code for Android ○ Swift and Objective-C code for iOS and macOS ○ C++ code for Windows Summary Pigeon Code Generator tool 26

THANK YOU! 27