Adding Flutter to an existing Android/iOS app

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Enzo Lizama Adding Flutter to an existing Android/iOS app Mobile Developer at Mandü @enzoftware

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Previous concepts

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Platform Channels?

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Method Channel The Flutter side sends notifications to the native side, usually used to call a method of native.

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Event Channel Used for data stream communication, it has the function of monitoring, such as pushing directly to the Flutter terminal after the change of power.

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Basic Message Channel Data used to pass strings or semi-structured objects.

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Project structure

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Integration with Android

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Using Android Studio

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Adding flutter module manually

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flutter create --template module flutter_module

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Depend on the Android Archive (AAR)

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android { // ... } repositories { maven { url 'some/path/my_flutter/build/host/outputs/repo' // This is relative to the location of the build.gradle file // if using a relative path. } maven { url 'http://download.flutter.io' } } dependencies { // ... debugImplementation 'com.example.flutter_module:flutter_debug:1.0' profileImplementation 'com.example.flutter_module:flutter_profile:1.0' releaseImplementation 'com.example.flutter_module:flutter_release:1.0' }

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Depend on the module’s source code

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// settings.gradle import javax.naming.Binding include ':.android' include ':app' setBinding(new Binding([gradle: this])) evaluate(new File(settingsDir.parentFile, 'flutter_android_ios/flutter_module/flutter_module/.android/include_flutter.groovy ' ))

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apply plugin: 'com.android.application' apply plugin: 'kotlin-android' apply plugin: 'kotlin-android-extensions' android { ... compileOptions { sourceCompatibility = 1.8 targetCompatibility = 1.8 } } dependencies { implementation fileTree(dir: 'libs', include: ['*.jar']) implementation Dependencies.kotlin ... androidTestImplementation Dependencies.mockk androidTestImplementation Dependencies.junit implementation project(path: ':flutter') }

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Integration with iOS

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Embed with CocoaPods and the Flutter SDK

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target 'ios_app' do flutter_application_path = 'ROUTE_TO_FLUTTER_MODULE' # /Users/enzoftware/Projects/add_flutter_to_existing_app/flutter_module load File.join(flutter_application_path, '.ios', 'Flutter', 'podhelper.rb') install_all_flutter_pods(flutter_application_path) # Comment the next line if you don't want to use dynamic frameworks use_frameworks! # Pods for ios_app target 'ios_appTests' do inherit! :search_paths # Pods for testing end target 'ios_appUITests' do # Pods for testing end end

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Embed frameworks in Xcode

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flutter build ios-framework --output=some/path/MyApp/Flutter/

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Embed application and plugin frameworks in Xcode and Flutter framework with CocoaPods

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flutter build ios-framework --cocoapods --output=some/path/MyApp/Flutter/ # In your Podfile pod 'Flutter', :podspec => 'some/path/MyApp/Flutter/{build_mode}/Flutter.podspec'

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Adding screens to work with Android

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myButton.setOnClickListener { startActivity( FlutterActivity.createDefaultIntent(this) ) } The easiest way

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myButton.setOnClickListener { startActivity( FlutterActivity .withNewEngine() .initialRoute("/my_route") .build(this) ) } The easiest way, with routes

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lateinit var flutterEngine : FlutterEngine override fun onCreate() { super.onCreate() // Instantiate a FlutterEngine. flutterEngine = FlutterEngine(this) // Start executing Dart code to pre-warm the FlutterEngine. flutterEngine.dartExecutor.executeDartEntrypoint( DartExecutor.DartEntrypoint.createDefault() ) // Cache the FlutterEngine to be used by FlutterActivity. FlutterEngineCache .getInstance() .put("my_engine_id", flutterEngine) } Pre-warm engine

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myButton.setOnClickListener { startActivity( FlutterActivity .withCachedEngine("my_engine_id") .build(this) ) } Pre-warm engine call

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var newFlutterFragment = FlutterFragment.createDefault() flutterFragment = newFlutterFragment fragmentManager .beginTransaction() .add( R.id.fragment_container, newFlutterFragment, TAG_FLUTTER_FRAGMENT ) .commit() Fragments? Yes!

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Adding screens to work with iOS

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@objc func showFlutter() { let flutterEngine = (UIApplication.shared.delegate as! AppDelegate).flutterEngine let flutterViewController = FlutterViewController(engine: flutterEngine, nibName: nil, bundle: nil) present(flutterViewController, animated: true, completion: nil) } FlutterViewController with your FlutterEngine

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let flutterEngine = FlutterEngine(name: "my flutter engine") flutterEngine.navigationChannel.invokeMethod("setInitialRoute", arguments:"/onboarding") flutterEngine.run() Working with routes

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Demo! Let’s see the code

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Limitations ● Running multiple Flutter instances or running in partial screen views may have undefined behavior. ● Using Flutter in background mode is still a WIP. ● Packing a Flutter library into another shareable library or packing multiple Flutter libraries into an application isn’t supported.

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https://ﬂutter.dev/docs/resources/faq#how-big-is-the-ﬂutter-engine How big is the Flutter engine?

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Summary

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Enzo Lizama THANKS! Mobile Developer at Mandü @enzoftware https://github.com/enzoftware/add_flutter_to_existing_app