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原理から完全理解する Dagger Hilt Migration Keita Kagurazaka

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本発表について ● 話すこと ○ 素のDaggerとdagger.android、Hiltの違い ○ Hiltへの移行方法 ○ 移行する際によく当たる問題とその解決方法 ● 話さないこと / 前提とする知識 ○ DIとは何か、その必要性 ○ Daggerの使い方、どんなクラスがあるかなど

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Agenda Daggerの捉え方 dagger.androidとHiltの思想 Hiltに段階的に移行する FAQ 01 02 03 04

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コンセプト ● 「段階的」なHilt移行 ○ 日々のプロジェクトと並行して進められるように ● 原理から理解する ○ 実際に移行する際に自ら壁を乗り越えられるように

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Daggerの捉え方 dagger.androidとHiltの思想 Hiltに段階的に移行する FAQ Agenda 01 02 03 04

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Dagger = Component Tree

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Dagger = Component Tree

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Componentの提供サービス 1. 依存性(インスタンス)の受け渡し 2. 依存性(インスタンス)の同一性保証

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Componentの提供サービス 1. 依存性(インスタンス)の受け渡し 2. 依存性(インスタンス)の同一性保証 = 何回受け渡しても同じインスタンス

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@Component(modules = [RepositoryModule::class]) interface ApplicationComponent { fun getUserRepository(): UserRepository fun inject(app: App) } Componentによる依存性の受け渡し

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@Component(modules = [RepositoryModule::class]) interface ApplicationComponent { fun getUserRepository(): UserRepository fun inject(app: App) } Componentによる依存性の受け渡し

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@Component(modules = [RepositoryModule::class]) interface ApplicationComponent { fun getUserRepository(): UserRepository fun inject(app: App) } Componentによる依存性の受け渡し

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@Singleton @Component(modules = [ApplicationModule::class]) interface ApplicationComponent { /* 省略 */ } @Module class ApplicationModule { @Singleton @Provides fun providesThirdPartyLibrary(): ThirdPartyLibrary = ThirdPartyLibrary.Builder.build() } Componentによる同一性保証

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@Singleton @Component(modules = [ApplicationModule::class]) interface ApplicationComponent { /* 省略 */ } @Module class ApplicationModule { @Singleton @Provides fun providesThirdPartyLibrary(): ThirdPartyLibrary = ThirdPartyLibrary.Builder.build() } Componentによる同一性保証

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@Singleton @Component(modules = [ApplicationModule::class]) interface ApplicationComponent { /* 省略 */ } @Module class ApplicationModule { @Singleton @Provides fun providesThirdPartyLibrary(): ThirdPartyLibrary = ThirdPartyLibrary.Builder.build() } Componentによる同一性保証

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倉庫預かりオプション ThirdPartyLibrary ください ThirdParty Library 倉庫 ApplicationComponent 以前と同じ ブツです

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@Singleton @Component(modules = [ApplicationModule::class]) interface ApplicationComponent { /* 省略 */ } @Module class ApplicationModule { @Singleton @Provides fun providesThirdPartyLibrary(): ThirdPartyLibrary = ThirdPartyLibrary.Builder.build() } Componentによる同一性保証

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@Singleton @Component(modules = [ApplicationModule::class]) interface ApplicationComponent { /* 省略 */ } @Module class ApplicationModule { @Provides fun providesThirdPartyLibrary(): ThirdPartyLibrary = ThirdPartyLibrary.Builder.build() } Componentによる同一性保証 毎回作り直し!

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Component = 工場 倉庫 受け渡し窓口

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Dagger = Component Tree

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インスタンスのライフタイム管理 アプリのプロセス終了まで 残ってるよ! ThirdParty Library ApplicationComponentが 消えるまで残ってるよ! 倉庫 ApplicationComponent

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インスタンスのライフタイム管理 LoginActivityComponent ApplicationComponent アプリのプロセス終了まで 残ってるよ! LoginActivityが 消えるまで残ってるよ!

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インスタンスのライフタイム管理 LoginActivityComponent ApplicationComponent 先輩のインスタンスも こちらで受け渡します!

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インスタンスのライフタイム管理 LoginActivityComponent ApplicationComponent 苦しゅうない 先輩のインスタンスも こちらで受け渡します!

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インスタンスのライフタイム管理 LoginActivityComponent ApplicationComponent Component Tree

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@Scope @Retention(AnnotationRetention.RUNTIME) annotation class ActivityScope @ActivityScope @Subcomponent interface LoginActivityComponent { fun inject(activity: LoginActivity) @Subcomponent.Factory interface Factory { fun create(): LoginActivityComponent } } SubcomponentによるTree定義

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@Scope @Retention(AnnotationRetention.RUNTIME) annotation class ActivityScope @ActivityScope @Subcomponent interface LoginActivityComponent { fun inject(activity: LoginActivity) @Subcomponent.Factory interface Factory { fun create(): LoginActivityComponent } } SubcomponentによるTree定義

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@Module(subcomponents = [LoginActivityComponent::class]) interface ActivityModule @Singleton @Component(modules = [ ApplicationModule::class, ActivityModule::class ]) interface ApplicationComponent SubcomponentによるTree定義

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@Module(subcomponents = [LoginActivityComponent::class]) interface ActivityModule @Singleton @Component(modules = [ ApplicationModule::class, ActivityModule::class ]) interface ApplicationComponent SubcomponentによるTree定義

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@Module(subcomponents = [LoginActivityComponent::class]) interface ActivityModule @Singleton @Component(modules = [ ApplicationModule::class, ActivityModule::class ]) interface ApplicationComponent SubcomponentによるTree定義

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Component Tree ApplicationComponent ActivityModule LoginActivityComponent ApplicationModule

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Component Tree ApplicationComponent ApplicationModule LoginActivityComponent

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Component Tree ApplicationC ApplicationM LoginActivityC

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Daggerの捉え方 dagger.androidとHiltの思想 Hiltに段階的に移行する FAQ Agenda 01 02 03 04

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interface ApplicationComponent { fun loginActivityComponent(): LoginActivityComponent.Factory } class LoginActivity : AppCompatActivity() { lateinit var component: LoginActivityComponent override fun onCreate(savedInstanceState: Bundle?) { component = (applicationContext as App).component .loginActivityComponent().create() component.inject(this) super.onCreate(savedInstanceState) } } Boilerplate問題

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interface ApplicationComponent { fun loginActivityComponent(): LoginActivityComponent.Factory } class LoginActivity : AppCompatActivity() { lateinit var component: LoginActivityComponent override fun onCreate(savedInstanceState: Bundle?) { component = (applicationContext as App).component .loginActivityComponent().create() component.inject(this) super.onCreate(savedInstanceState) } } Boilerplate問題

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dagger.android

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dagger.android 書くのが大変なら コード生成すればいいじゃない

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@Module interface MainActivityModule { @ActivityScope @ContributesAndroidInjector fun contributesMainActivity(): MainActivity } @Module( includes = [MainActivityModule::class], subcomponents = [LoginActivityComponent::class] ) interface ActivityModule dagger.androidの解法 - コード生成

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@Module interface MainActivityModule { @ActivityScope @ContributesAndroidInjector fun contributesMainActivity(): MainActivity } @Module( includes = [MainActivityModule::class], subcomponents = [LoginActivityComponent::class] ) interface ActivityModule dagger.androidの解法 - コード生成

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@Module interface MainActivityModule { @ActivityScope @ContributesAndroidInjector fun contributesMainActivity(): MainActivity } @Module( includes = [MainActivityModule::class], subcomponents = [LoginActivityComponent::class] ) interface ActivityModule dagger.androidの解法 - コード生成 MainActivitySubC

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@Module interface MainActivityModule { @ActivityScope @ContributesAndroidInjector fun contributesMainActivity(): MainActivity } @Module( includes = [MainActivityModule::class], subcomponents = [LoginActivityComponent::class] ) interface ActivityModule dagger.androidの解法 - コード生成

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@Module interface MainActivityModule { @ActivityScope @ContributesAndroidInjector fun contributesMainActivity(): MainActivity } @Module( includes = [MainActivityModule::class], subcomponents = [LoginActivityComponent::class] ) interface ActivityModule dagger.androidの解法 - コード生成 MainActivitySubC

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@Module interface MainActivityModule { @ActivityScope @ContributesAndroidInjector fun contributesMainActivity(): MainActivity } @Module( includes = [MainActivityModule::class], subcomponents = [LoginActivityComponent::class] ) interface ActivityModule dagger.androidの解法 - コード生成 ApplicationC MainActivitySubC

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@Module(subcomponents = MainActivityModule_ContributesMainActivity.MainActivitySubcomponent.class) public abstract class MainActivityModule_ContributesMainActivity { private MainActivityModule_ContributesMainActivity() {} @Binds @IntoMap @ClassKey(MainActivity.class) abstract AndroidInjector.Factory> bindAndroidInjectorFactory( MainActivitySubcomponent.Factory builder); @Subcomponent @ActivityScope public interface MainActivitySubcomponent extends AndroidInjector { @Subcomponent.Factory interface Factory extends AndroidInjector.Factory {} } }

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@Module(subcomponents = MainActivityModule_ContributesMainActivity.MainActivitySubcomponent.class) public abstract class MainActivityModule_ContributesMainActivity { private MainActivityModule_ContributesMainActivity() {} @Binds @IntoMap @ClassKey(MainActivity.class) abstract AndroidInjector.Factory> bindAndroidInjectorFactory( MainActivitySubcomponent.Factory builder); @Subcomponent @ActivityScope public interface MainActivitySubcomponent extends AndroidInjector { @Subcomponent.Factory interface Factory extends AndroidInjector.Factory {} } }

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@Module(subcomponents = MainActivityModule_ContributesMainActivity.MainActivitySubcomponent.class) public abstract class MainActivityModule_ContributesMainActivity { private MainActivityModule_ContributesMainActivity() {} @Binds @IntoMap @ClassKey(MainActivity.class) abstract AndroidInjector.Factory> bindAndroidInjectorFactory( MainActivitySubcomponent.Factory builder); @Subcomponent @ActivityScope public interface MainActivitySubcomponent extends AndroidInjector { @Subcomponent.Factory interface Factory extends AndroidInjector.Factory {} } }

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@Module(subcomponents = MainActivityModule_ContributesMainActivity.MainActivitySubcomponent.class) public abstract class MainActivityModule_ContributesMainActivity { private MainActivityModule_ContributesMainActivity() {} @Binds @IntoMap @ClassKey(MainActivity.class) abstract AndroidInjector.Factory> bindAndroidInjectorFactory( MainActivitySubcomponent.Factory builder); @Subcomponent @ActivityScope public interface MainActivitySubcomponent extends AndroidInjector { @Subcomponent.Factory interface Factory extends AndroidInjector.Factory {} } }

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@Module(subcomponents = MainActivityModule_ContributesMainActivity.MainActivitySubcomponent.class) public abstract class MainActivityModule_ContributesMainActivity { private MainActivityModule_ContributesMainActivity() {} @Binds @IntoMap @ClassKey(MainActivity.class) abstract AndroidInjector.Factory> bindAndroidInjectorFactory( MainActivitySubcomponent.Factory builder); @Subcomponent @ActivityScope public interface MainActivitySubcomponent extends AndroidInjector { @Subcomponent.Factory interface Factory extends AndroidInjector.Factory {} } } MainActivity

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@Module(subcomponents = MainActivityModule_ContributesMainActivity.MainActivitySubcomponent.class) public abstract class MainActivityModule_ContributesMainActivity { private MainActivityModule_ContributesMainActivity() {} @Binds @IntoMap @ClassKey(MainActivity.class) abstract AndroidInjector.Factory> bindAndroidInjectorFactory( MainActivitySubcomponent.Factory builder); @Subcomponent @ActivityScope public interface MainActivitySubcomponent extends AndroidInjector { @Subcomponent.Factory interface Factory extends AndroidInjector.Factory {} } } MainActivitySubC MainActivity

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@Module(subcomponents = MainActivityModule_ContributesMainActivity.MainActivitySubcomponent.class) public abstract class MainActivityModule_ContributesMainActivity { private MainActivityModule_ContributesMainActivity() {} @Binds @IntoMap @ClassKey(MainActivity.class) abstract AndroidInjector.Factory> bindAndroidInjectorFactory( MainActivitySubcomponent.Factory builder); @Subcomponent @ActivityScope public interface MainActivitySubcomponent extends AndroidInjector { @Subcomponent.Factory interface Factory extends AndroidInjector.Factory {} } } MainActivitySubC MainActivity

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dagger.androidのinjection

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dagger.androidのinjection 1. AndroidInjection.inject

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dagger.androidのinjection 1. AndroidInjection.inject DispatchingAndroidInjector

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dagger.androidのinjection 1. AndroidInjection.inject DispatchingAndroidInjector ︙ MainActivitySubC MainActivity MainFragmentSubC MainFragment LoginActivitySubC LoginActivity

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dagger.androidのinjection 1. AndroidInjection.inject 2. 渡されたインスタンスのクラスを keyにSubCを見つける DispatchingAndroidInjector ︙ MainActivitySubC MainActivity MainFragmentSubC MainFragment LoginActivitySubC LoginActivity

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dagger.androidのinjection 1. AndroidInjection.inject 2. 渡されたインスタンスのクラスを keyにSubCを見つける 3. SubCをインスタンス化して injection DispatchingAndroidInjector ︙ MainActivitySubC MainActivity MainFragmentSubC MainFragment LoginActivitySubC LoginActivity

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class App : Application(), HasAndroidInjector { @Inject lateinit var androidInjector: DispatchingAndroidInjector override fun androidInjector(): AndroidInjector = androidInjector } dagger.androidのinjection

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dagger.androidのComponent Tree ApplicationC MainActivitySubC MainFragmentSubC HogeFragmentSubC HugaActivitySubC HugaFragmentSubC PiyoFragmentSubC

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Hilt

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Hilt Componentは こっちで用意するから それ使ってね

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https://dagger.dev/hilt/components より引用 Hiltの解法 - プリセットComponent

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HiltのComponent Tree (simple ver.) SingletonC ActivityC FragmentC

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@InstallIn(SingletonComponent::class) @Module class ApplicationModule { @Singleton @Provides fun providesThirdPartyLibrary(): ThirdPartyLibrary = ThirdPartyLibrary.Builder.build() } プリセットComponentの使い方

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@InstallIn(SingletonComponent::class) @Module class ApplicationModule { @Singleton @Provides fun providesThirdPartyLibrary(): ThirdPartyLibrary = ThirdPartyLibrary.Builder.build() } プリセットComponentの使い方

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@InstallIn(SingletonComponent::class) @Module class ApplicationModule @Singleton @Component(modules = [ApplicationModule::class]) interface ApplicationComponent プリセットComponentの使い方

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@Component(modules = [AllApplicationModule::class]) interface ApplicationComponent { fun inject(instance: NeedInjectionClass) fun getUserRepository(): UserRepository } インスタンス受け渡し窓口閉鎖のご連絡

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@InstallIn(SingletonComponent::class) @EntryPoint interface ApplicationEntryPoint { fun inject(instance: NeedInjectionClass) fun getUserRepository(): UserRepository } EntryPoint

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@InstallIn(SingletonComponent::class) @EntryPoint interface ApplicationEntryPoint { fun inject(instance: NeedInjectionClass) fun getUserRepository(): UserRepository } public abstract static class SingletonC implements SingletonComponent, ApplicationEntryPoint { /* 省略 */ } EntryPoint = Componentの1窓口

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interface RepositoryProvider { fun getUserRepository(): UserRepository } interface ApplicationInjector { fun inject(instance: NeedInjectionClass) } @Singleton @Component(modules = [ApplicationModule::class]) interface ApplicationComponent : RepositoryProvider, ApplicationInjector EntryPoint ≈ Componentの分割定義

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class MainActivity : AppCompatActivity() class MainFragment : Fragment() HiltのInjection

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@AndroidEntryPoint class MainActivity : AppCompatActivity() @AndroidEntryPoint class MainFragment : Fragment() HiltのInjection

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public abstract class Hilt_MainActivity extends AppCompatActivity implements GeneratedComponentManagerHolder { Hilt_MainActivity() { super(); _initHiltInternal(); } private void _initHiltInternal() { addOnContextAvailableListener(new OnContextAvailableListener() { @Override public void onContextAvailable(Context context) { inject(); } }); } }

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public abstract class Hilt_MainActivity extends AppCompatActivity implements GeneratedComponentManagerHolder { Hilt_MainActivity() { super(); _initHiltInternal(); } private void _initHiltInternal() { addOnContextAvailableListener(new OnContextAvailableListener() { @Override public void onContextAvailable(Context context) { inject(); } }); } }

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public abstract class Hilt_MainActivity extends AppCompatActivity implements GeneratedComponentManagerHolder { Hilt_MainActivity() { super(); _initHiltInternal(); } private void _initHiltInternal() { addOnContextAvailableListener(new OnContextAvailableListener() { @Override public void onContextAvailable(Context context) { inject(); } }); } } ボイラープレート 全部ここでやります

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public abstract class Hilt_MainActivity extends AppCompatActivity implements GeneratedComponentManagerHolder { Hilt_MainActivity() { super(); _initHiltInternal(); } private void _initHiltInternal() { addOnContextAvailableListener(new OnContextAvailableListener() { @Override public void onContextAvailable(Context context) { inject(); } }); } }

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@AndroidEntryPoint class MainActivity : AppCompatActivity() Bytecode transformation in .kt

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@AndroidEntryPoint class MainActivity : AppCompatActivity() Bytecode transformation in .kt

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@AndroidEntryPoint class MainActivity : Hilt_MainActivity() Bytecode transformation in .dex

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@AndroidEntryPoint class MainActivity : AppCompatActivity() @AndroidEntryPoint class MainFragment : Fragment() HiltのInjection

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Daggerの捉え方 dagger.androidとHiltの思想 Hiltに段階的に移行する FAQ Agenda 01 02 03 04

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サンプルプロジェクト ● https://github.com/k-kagurazaka/hilt-migration ● main branch ○ raw Dagger + dagger.androidの構成 ● hilt-migration branch ○ Hilt化済み ○ 各commitはbuild pass

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サンプルプロジェクトのComponent Tree ApplicationC MainActivityC MainFragmentC LoginActivityC LoginFragmentC EmailSignupActivityC UserRegistrationFragmentC SnsSignupActivityC UserRegistrationFragmentC

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raw Dagger ApplicationC MainActivityC MainFragmentC LoginActivityC LoginFragmentC EmailSignupActivityC UserRegistrationFragmentC SnsSignupActivityC UserRegistrationFragmentC

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dagger.android ApplicationC MainActivityC MainFragmentC LoginActivityC LoginFragmentC EmailSignupActivityC UserRegistrationFragmentC SnsSignupActivityC UserRegistrationFragmentC

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同一Fragment、別Component ApplicationC MainActivityC MainFragmentC LoginActivityC LoginFragmentC EmailSignupActivityC UserRegistrationFragmentC SnsSignupActivityC UserRegistrationFragmentC

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移行スタート

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移行ステップ 1. gradleの設定 2. Component Treeの接ぎ木 3. Scopeアノテーションの置き換え 4. MainActivityの移行 5. Loginの移行 6. MainFragmentの移行 7. Activityのお掃除 8. dagger.androidの除去 9. ApplicationComponentの削除

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移行ステップ 1. gradleの設定 2. Component Treeの接ぎ木 3. Scopeアノテーションの置き換え 4. MainActivityの移行 5. Loginの移行 6. MainFragmentの移行 7. Activityのお掃除 8. dagger.androidの除去 9. ApplicationComponentの削除

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SKIP

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移行ステップ 1. gradleの設定 2. Component Treeの接ぎ木 3. Scopeアノテーションの置き換え 4. MainActivityの移行 5. Loginの移行 6. MainFragmentの移行 7. Activityのお掃除 8. dagger.androidの除去 9. ApplicationComponentの削除

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Component Treeの接ぎ木 ApplicationC MainActivityC MainFragmentC LoginActivityC LoginFragmentC SingletonC ActivityC FragmentC ApplicationM RepositoryM

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Component Treeの接ぎ木 ApplicationC MainActivityC MainFragmentC LoginActivityC LoginFragmentC SingletonC ActivityC FragmentC ApplicationM RepositoryM

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@Singleton @Component(modules = [ AndroidInjectionModule::class, ApplicationModule::class, RepositoryModule::class, ActivityModule::class,]) interface ApplicationComponent : AndroidInjector { fun loginActivityComponent(): LoginActivityComponent.Factory @Component.Factory interface Factory { fun create(@BindsInstance app: App): ApplicationComponent } } Component Treeの接ぎ木

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@Singleton @Component(modules = [ AndroidInjectionModule::class, ApplicationModule::class, RepositoryModule::class, ActivityModule::class,]) interface ApplicationComponent : AndroidInjector { fun loginActivityComponent(): LoginActivityComponent.Factory @Component.Factory interface Factory { fun create(@BindsInstance app: App): ApplicationComponent } } Component Treeの接ぎ木

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@Singleton @Component(modules = [ AndroidInjectionModule::class, ApplicationModule::class, RepositoryModule::class, ActivityModule::class,]) interface ApplicationComponent : AndroidInjector { fun loginActivityComponent(): LoginActivityComponent.Factory } Component Treeの接ぎ木

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@Singleton @Component(modules = [ AndroidInjectionModule::class, ApplicationModule::class, RepositoryModule::class, ActivityModule::class,]) @InstallIn(SingletonComponent::class) @EntryPoint interface ApplicationComponent : AndroidInjector { fun loginActivityComponent(): LoginActivityComponent.Factory } Component Treeの接ぎ木

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@Singleton @Component(modules = [ AndroidInjectionModule::class, ApplicationModule::class, RepositoryModule::class, ActivityModule::class,]) @InstallIn(SingletonComponent::class) @EntryPoint interface ApplicationComponent : AndroidInjector { fun loginActivityComponent(): LoginActivityComponent.Factory } Component Treeの接ぎ木

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SingletonCImpl Component Treeの接ぎ木 ApplicationC MainActivityC MainFragmentC LoginActivityC LoginFragmentC SingletonC ActivityC FragmentC ApplicationM RepositoryM

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SingletonCImpl Component Treeの接ぎ木 ApplicationC MainActivityC MainFragmentC LoginActivityC LoginFragmentC SingletonC ActivityC FragmentC ApplicationM RepositoryM

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@Singleton @Component(modules = [ AndroidInjectionModule::class, ApplicationModule::class, RepositoryModule::class, ActivityModule::class,]) @InstallIn(SingletonComponent::class) @EntryPoint interface ApplicationComponent : AndroidInjector { fun loginActivityComponent(): LoginActivityComponent.Factory } Component Treeの接ぎ木

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@InstallIn(SingletonComponent::class) @Module(includes = [ AndroidInjectionModule::class, ApplicationModule::class, RepositoryModule::class, ActivityModule::class,]) interface AggregatorModule @InstallIn(SingletonComponent::class) @EntryPoint interface ApplicationComponent : AndroidInjector { fun loginActivityComponent(): LoginActivityComponent.Factory } Component Treeの接ぎ木

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SingletonCImpl Component Treeの接ぎ木 ApplicationC MainActivityC MainFragmentC LoginActivityC LoginFragmentC SingletonC ActivityC FragmentC ApplicationM RepositoryM

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class App : Application(), HasAndroidInjector { val component: ApplicationComponent = DaggerApplicationComponent.factory().create(this) @Inject lateinit var androidInjector: DispatchingAndroidInjector override fun androidInjector(): AndroidInjector = androidInjector } Applicationの変更

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class App : Application(), HasAndroidInjector { val component: ApplicationComponent = DaggerApplicationComponent.factory().create(this) @Inject lateinit var androidInjector: DispatchingAndroidInjector override fun androidInjector(): AndroidInjector = androidInjector } Applicationの変更

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class App : Application(), HasAndroidInjector { val component: ApplicationComponent by lazy { EntryPoints.get(this, ApplicationComponent::class.java) } @Inject lateinit var androidInjector: DispatchingAndroidInjector override fun androidInjector(): AndroidInjector = androidInjector } Applicationの変更

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class App : Application(), HasAndroidInjector { val component: ApplicationComponent by lazy { EntryPoints.get(this, ApplicationComponent::class.java) } @Inject lateinit var androidInjector: DispatchingAndroidInjector override fun androidInjector(): AndroidInjector = androidInjector } Applicationの変更

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@HiltAndroidApp class App : Application(), HasAndroidInjector { val component: ApplicationComponent by lazy { EntryPoints.get(this, ApplicationComponent::class.java) } @Inject lateinit var androidInjector: DispatchingAndroidInjector override fun androidInjector(): AndroidInjector = androidInjector } Applicationの変更

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@HiltAndroidApp class App : Application(), HasAndroidInjector { val component: ApplicationComponent by lazy { EntryPoints.get(this, ApplicationComponent::class.java) } @Inject lateinit var androidInjector: DispatchingAndroidInjector override fun androidInjector(): AndroidInjector = androidInjector } Applicationの変更

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@HiltAndroidApp class App : Application(), HasAndroidInjector { val component: ApplicationComponent by lazy { EntryPoints.get(this, ApplicationComponent::class.java) } @Inject lateinit var androidInjector: DispatchingAndroidInjector override fun androidInjector(): AndroidInjector = androidInjector } Applicationの変更

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SingletonCImpl 現時点のComponent Tree ApplicationC MainActivityC MainFragmentC LoginActivityC LoginFragmentC SingletonC ActivityC FragmentC ApplicationM RepositoryM

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現時点のComponent Tree ApplicationC MainActivityC MainFragmentC LoginActivityC LoginFragmentC SingletonC ActivityC FragmentC ApplicationM RepositoryM

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移行ステップ 1. gradleの設定 2. Component Treeの接ぎ木 3. Scopeアノテーションの置き換え 4. MainActivityの移行 5. Loginの移行 6. MainFragmentの移行 7. Activityのお掃除 8. dagger.androidの除去 9. ApplicationComponentの削除

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@Module interface MainActivityModule { @ActivityScope @ContributesAndroidInjector(modules = [MainFragmentModule::class]) fun contributesMainActivity(): MainActivity } @Module interface MainFragmentModule { @FragmentScope @ContributesAndroidInjector fun contributesMainFragment(): MainFragment } Scopeアノテーションの置き換え

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@Module interface MainActivityModule { @ActivityScope @ContributesAndroidInjector(modules = [MainFragmentModule::class]) fun contributesMainActivity(): MainActivity } @Module interface MainFragmentModule { @FragmentScope @ContributesAndroidInjector fun contributesMainFragment(): MainFragment } Scopeアノテーションの置き換え

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import dagger.hilt.android.scopes.ActivityScoped import dagger.hilt.android.scopes.FragmentScoped @Module interface MainActivityModule { @ActivityScoped @ContributesAndroidInjector(modules = [MainFragmentModule::class]) fun contributesMainActivity(): MainActivity } @Module interface MainFragmentModule { @FragmentScoped @ContributesAndroidInjector fun contributesMainFragment(): MainFragment } Scopeアノテーションの置き換え

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import dagger.hilt.android.scopes.ActivityScoped import dagger.hilt.android.scopes.FragmentScoped @Module interface MainActivityModule { @ActivityScoped @ContributesAndroidInjector(modules = [MainFragmentModule::class]) fun contributesMainActivity(): MainActivity } @Module interface MainFragmentModule { @FragmentScoped @ContributesAndroidInjector fun contributesMainFragment(): MainFragment } Scopeアノテーションの置き換え

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移行ステップ 1. gradleの設定 2. Component Treeの接ぎ木 3. Scopeアノテーションの置き換え 4. MainActivityの移行 5. Loginの移行 6. MainFragmentの移行 7. Activityのお掃除 8. dagger.androidの除去 9. ApplicationComponentの削除

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移行 = 担当Component変更 ApplicationC MainActivityC MainFragmentC LoginActivityC LoginFragmentC SingletonC ActivityC FragmentC

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移行 = 担当Component変更 ApplicationC MainActivityC MainFragmentC LoginActivityC LoginFragmentC SingletonC ActivityC FragmentC MainActivity担当

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移行 = 担当Component変更 ApplicationC MainActivityC MainFragmentC LoginActivityC LoginFragmentC SingletonC ActivityC FragmentC MainActivity担当

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class MainActivity : AppCompatActivity(), HasAndroidInjector { @Inject lateinit var androidInjector: DispatchingAndroidInjector override fun androidInjector(): AndroidInjector = androidInjector override fun onCreate(savedInstanceState: Bundle?) { AndroidInjection.inject(this) super.onCreate(savedInstanceState) } } MainActivityの移行

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class MainActivity : AppCompatActivity(), HasAndroidInjector { @Inject lateinit var androidInjector: DispatchingAndroidInjector override fun androidInjector(): AndroidInjector = androidInjector override fun onCreate(savedInstanceState: Bundle?) { AndroidInjection.inject(this) super.onCreate(savedInstanceState) } } MainActivityの移行

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class MainActivity : AppCompatActivity(), HasAndroidInjector { @Inject lateinit var androidInjector: DispatchingAndroidInjector override fun androidInjector(): AndroidInjector = androidInjector override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) } } MainActivityの移行

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@AndroidEntryPoint class MainActivity : AppCompatActivity(), HasAndroidInjector { @Inject lateinit var androidInjector: DispatchingAndroidInjector override fun androidInjector(): AndroidInjector = androidInjector override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) } } MainActivityの移行

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@AndroidEntryPoint class MainActivity : AppCompatActivity(), HasAndroidInjector { @Inject lateinit var androidInjector: DispatchingAndroidInjector override fun androidInjector(): AndroidInjector = androidInjector override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) } } MainActivityの移行

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MainActivityのComponent削除 ApplicationC MainActivityC MainFragmentC LoginActivityC LoginFragmentC SingletonC ActivityC FragmentC

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MainActivityのComponent削除 ApplicationC MainFragmentC LoginActivityC LoginFragmentC SingletonC ActivityC FragmentC

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MainFragmentのComponent接ぎ木 ApplicationC MainFragmentC LoginActivityC LoginFragmentC SingletonC ActivityC FragmentC

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MainFragmentのComponent接ぎ木 ApplicationC MainFragmentC LoginActivityC LoginFragmentC SingletonC ActivityC FragmentC

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MainFragmentのComponent接ぎ木 ApplicationC MainFragmentC LoginActivityC LoginFragmentC SingletonC ActivityC FragmentC MainFragmentModule

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@InstallIn(ActivityComponent::class) @Module( includes = [ MainFragmentModule::class, ] ) interface DaggerAndroidActivityModule MainFragmentのComponent接ぎ木

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移行ステップ 1. gradleの設定 2. Component Treeの接ぎ木 3. Scopeアノテーションの置き換え 4. MainActivityの移行 5. Loginの移行 6. MainFragmentの移行 7. Activityのお掃除 8. dagger.androidの除去 9. ApplicationComponentの削除

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Loginの移行 ApplicationC MainFragmentC LoginActivityC LoginFragmentC SingletonC ActivityC FragmentC

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Loginの移行 ApplicationC MainFragmentC LoginActivityC LoginFragmentC SingletonC ActivityC FragmentC

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Loginの移行 ApplicationC MainFragmentC LoginActivityC LoginFragmentC SingletonC ActivityC FragmentC LoginActivity担当 LoginFragment担当

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Loginの移行 ApplicationC MainFragmentC LoginActivityC LoginFragmentC SingletonC ActivityC FragmentC LoginActivity担当 LoginFragment担当

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class LoginActivity : AppCompatActivity() { lateinit var component: LoginActivityComponent override fun onCreate(savedInstanceState: Bundle?) { component = (applicationContext as App).component .loginActivityComponent().create(this) component.inject(this) super.onCreate(savedInstanceState) } } LoginActivityの移行

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class LoginActivity : AppCompatActivity() { lateinit var component: LoginActivityComponent override fun onCreate(savedInstanceState: Bundle?) { component = (applicationContext as App).component .loginActivityComponent().create(this) component.inject(this) super.onCreate(savedInstanceState) } } LoginActivityの移行

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class LoginActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) } } LoginActivityの移行

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@AndroidEntryPoint class LoginActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) } } LoginActivityの移行

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@AndroidEntryPoint class LoginActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) /* 省略 */ } } LoginActivityの移行

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class LoginFragment: Fragment() { lateinit var component: LoginFragmentComponent override fun onAttach(context: Context) { super.onAttach(context) component = (requireActivity() as LoginActivity).component .loginFragmentComponent().create(this) component.inject(this) } } LoginFragmentの移行

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class LoginFragment: Fragment() { lateinit var component: LoginFragmentComponent override fun onAttach(context: Context) { super.onAttach(context) component = (requireActivity() as LoginActivity).component .loginFragmentComponent().create(this) component.inject(this) } } LoginFragmentの移行

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class LoginFragment: Fragment() { override fun onAttach(context: Context) { super.onAttach(context) } } LoginFragmentの移行

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@AndroidEntryPoint class LoginFragment: Fragment() { override fun onAttach(context: Context) { super.onAttach(context) } } LoginFragmentの移行

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@AndroidEntryPoint class LoginFragment: Fragment() { override fun onAttach(context: Context) { super.onAttach(context) /* 省略 */ } } LoginFragmentの移行

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LoginのComponent削除 ApplicationC MainFragmentC LoginActivityC LoginFragmentC SingletonC ActivityC FragmentC

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LoginのComponent削除 ApplicationC MainFragmentC SingletonC ActivityC FragmentC

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LoginのComponent削除 ApplicationC MainFragmentC SingletonC ActivityC FragmentC

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移行ステップ 1. gradleの設定 2. Component Treeの接ぎ木 3. Scopeアノテーションの置き換え 4. MainActivityの移行 5. Loginの移行 6. MainFragmentの移行 7. Activityのお掃除 8. dagger.androidの除去 9. ApplicationComponentの削除

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MainFragmentの移行 ApplicationC MainFragmentC SingletonC ActivityC FragmentC MainFragment担当

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MainFragmentの移行 ApplicationC MainFragmentC SingletonC ActivityC FragmentC MainFragment担当

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class MainFragment : Fragment() { override fun onAttach(context: Context) { AndroidSupportInjection.inject(this) super.onAttach(context) /* 省略 */ } } MainFragmentの移行

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class MainFragment : Fragment() { override fun onAttach(context: Context) { AndroidSupportInjection.inject(this) super.onAttach(context) /* 省略 */ } } MainFragmentの移行

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class MainFragment : Fragment() { override fun onAttach(context: Context) { super.onAttach(context) /* 省略 */ } } MainFragmentの移行

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@AndroidEntryPoint class MainFragment : Fragment() { override fun onAttach(context: Context) { super.onAttach(context) /* 省略 */ } } MainFragmentの移行

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@AndroidEntryPoint class MainFragment : Fragment() { override fun onAttach(context: Context) { super.onAttach(context) /* 省略 */ } } MainFragmentの移行

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MainFragmentのComponent削除 ApplicationC MainFragmentC SingletonC ActivityC FragmentC

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MainFragmentのComponent削除 ApplicationC SingletonC ActivityC FragmentC

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移行ステップ 1. gradleの設定 2. Component Treeの接ぎ木 3. Scopeアノテーションの置き換え 4. MainActivityの移行 5. Loginの移行 6. MainFragmentの移行 7. Activityのお掃除 8. dagger.androidの除去 9. ApplicationComponentの削除

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@AndroidEntryPoint class MainActivity : AppCompatActivity(), HasAndroidInjector { @Inject lateinit var androidInjector: DispatchingAndroidInjector override fun androidInjector(): AndroidInjector = androidInjector /* 省略 */ } MainActivityからdagger.androidを除去

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@AndroidEntryPoint class MainActivity : AppCompatActivity(), HasAndroidInjector { @Inject lateinit var androidInjector: DispatchingAndroidInjector override fun androidInjector(): AndroidInjector = androidInjector /* 省略 */ } MainActivityからdagger.androidを除去

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@AndroidEntryPoint class MainActivity : AppCompatActivity() { /* 省略 */ } MainActivityからdagger.androidを除去

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移行ステップ 1. gradleの設定 2. Component Treeの接ぎ木 3. Scopeアノテーションの置き換え 4. MainActivityの移行 5. Loginの移行 6. MainFragmentの移行 7. Activityのお掃除 8. dagger.androidの除去 9. ApplicationComponentの削除

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Activity / Fragmentの移行が完了したら ApplicationC SingletonC ActivityC FragmentC

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@HiltAndroidApp class App : Application(), HasAndroidInjector { @Inject lateinit var androidInjector: DispatchingAndroidInjector override fun androidInjector(): AndroidInjector = androidInjector val component: ApplicationComponent by lazy { EntryPoints.get(this, ApplicationComponent::class.java) } } Appからdagger.androidを除去

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@HiltAndroidApp class App : Application(), HasAndroidInjector { @Inject lateinit var androidInjector: DispatchingAndroidInjector override fun androidInjector(): AndroidInjector = androidInjector val component: ApplicationComponent by lazy { EntryPoints.get(this, ApplicationComponent::class.java) } } Appからdagger.androidを除去

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@HiltAndroidApp class App : Application() { val component: ApplicationComponent by lazy { EntryPoints.get(this, ApplicationComponent::class.java) } } Appからdagger.androidを除去

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@InstallIn(SingletonComponent::class) @EntryPoint interface ApplicationComponent : AndroidInjector @InstallIn(SingletonComponent::class) @Module( includes = [ AndroidInjectionModule::class, ApplicationModule::class, RepositoryModule::class, ] ) interface AggregatorModule Component Treeからdagger.androidを除去

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@InstallIn(SingletonComponent::class) @EntryPoint interface ApplicationComponent : AndroidInjector @InstallIn(SingletonComponent::class) @Module( includes = [ AndroidInjectionModule::class, ApplicationModule::class, RepositoryModule::class, ] ) interface AggregatorModule Component Treeからdagger.androidを除去

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@InstallIn(SingletonComponent::class) @EntryPoint interface ApplicationComponent @InstallIn(SingletonComponent::class) @Module( includes = [ ApplicationModule::class, RepositoryModule::class, ] ) interface AggregatorModule Component Treeからdagger.androidを除去

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移行ステップ 1. gradleの設定 2. Component Treeの接ぎ木 3. Scopeアノテーションの置き換え 4. MainActivityの移行 5. Loginの移行 6. MainFragmentの移行 7. Activityのお掃除 8. dagger.androidの除去 9. ApplicationComponentの削除

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ApplicationComponent削除 ApplicationC SingletonC ActivityC FragmentC

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ApplicationComponent削除 ApplicationC SingletonC ActivityC FragmentC

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@HiltAndroidApp class App : Application() { val component: ApplicationComponent by lazy { EntryPoints.get(this, ApplicationComponent::class.java) } } @InstallIn(SingletonComponent::class) @EntryPoint interface ApplicationComponent ApplicationComponentを削除

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@HiltAndroidApp class App : Application() { val component: ApplicationComponent by lazy { EntryPoints.get(this, ApplicationComponent::class.java) } } @InstallIn(SingletonComponent::class) @EntryPoint interface ApplicationComponent ApplicationComponentを削除

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@HiltAndroidApp class App : Application() { /* 省略 */ } ApplicationComponentを削除

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Well done 👏

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Daggerの捉え方 dagger.androidとHiltの思想 Hiltに段階的に移行する FAQ Agenda 01 02 03 04

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Q. LoginActivityのような具象クラスを扱いたい @ActivityScope @Subcomponent interface LoginActivityComponent { @Subcomponent.Factory interface Factory { fun create(@BindsInstance activity: LoginActivity): LoginActivityComponent } }

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Q. LoginActivityのような具象クラスを扱いたい A. castしましょう @InstallIn(ActivityComponent::class) @Module class LoginActivityModule { @Provides fun providesLoginActivity(activity: Activity): LoginActivity? = activity as? LoginActivity? }

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Q. LoginActivityのような具象クラスを扱いたい A. castしましょう @InstallIn(ActivityComponent::class) @Module class LoginFeatureModule { @Provides fun providesLoginActivity(activity: Activity): LoginFeature? = (activity as? HasLoginFeature?)?.loginFeature }

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Q. ActivityごとにModuleを切り替えたい @Module interface SignupActivityModule { @ActivityScope @ContributesAndroidInjector(modules = [EmailModule::class]) fun contributesEmailSignupActivity(): EmailSignupActivity @ActivityScope @ContributesAndroidInjector(modules = [SnsModule::class]) fun contributesSnsSignupActivity(): SnsSignupActivity }

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Q. ActivityごとにModuleを切り替えたい @Module interface SignupActivityModule { @ActivityScope @ContributesAndroidInjector(modules = [EmailModule::class]) fun contributesEmailSignupActivity(): EmailSignupActivity @ActivityScope @ContributesAndroidInjector(modules = [SnsModule::class]) fun contributesSnsSignupActivity(): SnsSignupActivity }

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Q. ActivityごとにModuleを切り替えたい @Module interface EmailModule { @Binds fun bindsFeature(feature: EmailSignupFeature): SignupFeature } @Module interface SnsModule { @Binds fun bindsFeature(feature: SnsSignupFeature): SignupFeature }

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Q. ActivityごとにModuleを切り替えたい A. 切り替えたいのはModuleではなくインスタンス @InstallIn(ActivityComponent::class) @Module class SignupModule { @Provides fun providesFeature(activity: Activity): SignupFeature = when (activity) { is EmailSignupActivity -> EmailSignupFeature() is SnsSignupActivity -> SnsSignupFeature() else -> error("Invalid Activity") } }

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Q. FCMServiceにinjectするとUIテストが落ちるのですが @AndroidEntryPoint class MyFirebaseMessagingService : FirebaseMessagingService() { @Inject lateinit var useCase: RegisterToken override fun onNewToken(token: String) { super.onNewToken(token) useCase.execute(token) } }

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Q. FCMServiceにinjectするとUIテストが落ちるのですが C Tree @Before @After C Tree @Before @After C Tree @Before @After

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Q. FCMServiceにinjectするとUIテストが落ちるのですが ContentProvider 初期化 C Tree @Before @After C Tree @Before @After C Tree @Before @After

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Q. FCMServiceにinjectするとUIテストが落ちるのですが A. テストでuseCase実行を諦めましょう class MyFirebaseMessagingService : FirebaseMessagingService() { @EntryPoint @InstallIn(SingletonComponent::class) interface LocalEntryPoint { fun useCase(): RegisterToken } }

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Q. FCMServiceにinjectするとUIテストが落ちるのですが A. テストでuseCase実行を諦めましょう class MyFirebaseMessagingService : FirebaseMessagingService() { private val useCase: RegisterToken? by lazy { try { EntryPointAccessors.fromApplication( applicationContext, LocalEntryPoint::class.java ).useCase() } catch (t: Throwable) { null } } }

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Q. FCMServiceにinjectするとUIテストが落ちるのですが A. テストでuseCase実行を諦めましょう class MyFirebaseMessagingService : FirebaseMessagingService() { override fun onNewToken(token: String) { super.onNewToken(token) useCase?.execute(token) } }

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Q. 今度はApplicationでUIテストが落ちるのですが ContentProvider 初期化 C Tree @Before @After C Tree @Before @After C Tree @Before @After

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Q. 今度はApplicationでUIテストが落ちるのですが App#onCreate ContentProvider 初期化 C Tree @Before @After C Tree @Before @After C Tree @Before @After

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Q. 今度はApplicationでUIテストが落ちるのですが A. 初期化処理を遅延実行しましょう

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open class BaseApp : Application() { @EntryPoint @InstallIn(SingletonComponent::class) interface AppEntryPoint { fun appDependencies(): AppDependencies } private val entryPoint: AppEntryPoint by lazy { EntryPointAccessors.fromApplication(this, AppEntryPoint::class.java) } }

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open class BaseApp : Application() { override fun onCreate() { super.onCreate() initializeOnCreate() } protected open fun initializeOnCreate() { // ここに必要な初期化処理 } }

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@CustomTestApplication(AndroidTestApp::class) interface HiltAndroidTestApp class AndroidTestApp : BaseApp() { private val isInitialized = AtomicBoolean(false) override fun initializeOnCreate() { // 初期化はここでは実施しない } fun initialize() { if (isInitialized.compareAndSet(false, true)) { super.initializeOnCreate() } } }

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@CustomTestApplication(AndroidTestApp::class) interface HiltAndroidTestApp class AndroidTestApp : BaseApp() { private val isInitialized = AtomicBoolean(false) override fun initializeOnCreate() { // 初期化はここでは実施しない } fun initialize() { if (isInitialized.compareAndSet(false, true)) { super.initializeOnCreate() } } }

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@CustomTestApplication(AndroidTestApp::class) interface HiltAndroidTestApp class AndroidTestApp : BaseApp() { private val isInitialized = AtomicBoolean(false) override fun initializeOnCreate() { // 初期化はここでは実施しない } fun initialize() { if (isInitialized.compareAndSet(false, true)) { super.initializeOnCreate() } } }

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@CustomTestApplication(AndroidTestApp::class) interface HiltAndroidTestApp class AndroidTestApp : BaseApp() { private val isInitialized = AtomicBoolean(false) override fun initializeOnCreate() { // 初期化はここでは実施しない } fun initialize() { if (isInitialized.compareAndSet(false, true)) { super.initializeOnCreate() } } }

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class AppInitializeAndroidTestRule : TestRule { override fun apply(base: Statement, description: Description): Statement = object : Statement() { override fun evaluate() { val app = ApplicationProvider.getApplicationContext() app.initialize() base.evaluate() } } }

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class AppInitializeAndroidTestRule : TestRule { override fun apply(base: Statement, description: Description): Statement = object : Statement() { override fun evaluate() { val app = ApplicationProvider.getApplicationContext() app.initialize() base.evaluate() } } }

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fun androidTestRule(testInstance: Any): TestRule = RuleChain.outerRule(HiltAndroidRule(testInstance)) .around(AppInitializeAndroidTestRule()) @HiltAndroidTest @RunWith(AndroidJUnit4::class) class SomeUiTest { @get:Rule val rule = androidTestRule(this) }

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Q. 〇〇を□□したい!

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Q. 〇〇を□□したい! A. Component Treeを思い浮かべて、原理から考えよう

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Thanks!