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‎README.md

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# Dagger Multi Module Android
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Plain Dagger implementation in multi module project
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### Articles
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- [Offical android dagger documentation](https://developer.android.com/training/dependency-injection/dagger-multi-module)
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- [Mindorks Multi-Module-Dagger article](https://blog.mindorks.com/dagger-in-a-multi-module-project)
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- [Step by step multi module dagger implementation](https://proandroiddev.com/android-multi-module-dagger-a-real-use-case-step-by-step-bbc03500f2f9)
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### Reference projects that I get inspired
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- [https://github.com/MindorksOpenSource/Dagger-Multi-Module-Android](https://github.com/MindorksOpenSource/Dagger-Multi-Module-Android)
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- [https://github.com/elye/demo_android_dagger_modules_setup](https://github.com/elye/demo_android_dagger_modules_setup)
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- [https://github.com/Ladgertha/Dagger-Multi-Modules](https://github.com/Ladgertha/Dagger-Multi-Modules)
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Feel free to contribute

‎app/build.gradle

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apply plugin: 'com.android.application'
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apply plugin: 'kotlin-android'
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apply plugin: 'kotlin-android-extensions'
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apply plugin: 'kotlin-kapt'
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android {
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compileSdkVersion 29
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dependencies {
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implementation fileTree(dir: 'libs', include: ['*.jar'])
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implementation project(":base")
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implementation project(":feature-one")
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implementation project(":feature-two")
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implementation project(":feature-three")
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implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
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implementation 'androidx.appcompat:appcompat:1.1.0'
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implementation 'androidx.core:core-ktx:1.2.0'
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implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
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testImplementation 'junit:junit:4.12'
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androidTestImplementation 'androidx.test.ext:junit:1.1.1'
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androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
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// Dagger dependencies
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implementation "com.google.dagger:dagger:$daggerVersion"
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kapt "com.google.dagger:dagger-compiler:$daggerVersion"
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}

‎app/src/main/AndroidManifest.xml

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package="com.ysfcyln.daggermultimodule">
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<application
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android:name=".MyApp"
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android:allowBackup="true"
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android:icon="@mipmap/ic_launcher"
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android:label="@string/app_name"

‎app/src/main/java/com/ysfcyln/daggermultimodule/MainActivity.kt

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package com.ysfcyln.daggermultimodule
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import android.content.Intent
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import androidx.appcompat.app.AppCompatActivity
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import android.os.Bundle
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import android.util.Log
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import com.ysfcyln.base.DatabaseService
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import com.ysfcyln.base.NetworkService
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import com.ysfcyln.daggermultimodule.R
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import com.ysfcyln.daggermultimodule.di.main.MainComponentProvider
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import com.ysfcyln.feature_one.FeatureOneActivity
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import com.ysfcyln.feature_two.FeatureTwoActivity
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import kotlinx.android.synthetic.main.activity_main.*
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import javax.inject.Inject
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class MainActivity : AppCompatActivity() {
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@Inject
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lateinit var databaseService: DatabaseService
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@Inject
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lateinit var networkService: NetworkService
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/**
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* Create component and inject
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*/
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private fun inject() {
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// When rotation happens component and its dependencies recreated :(
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val mainComponent = (application as MainComponentProvider).provideMainComponent()
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mainComponent.inject(this)
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}
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override fun onCreate(savedInstanceState: Bundle?) {
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inject()
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super.onCreate(savedInstanceState)
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setContentView(R.layout.activity_main)
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Log.d("MainActivity", databaseService.toString())
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Log.d("MainActivity", networkService.toString())
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clickListeners()
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}
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/**
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* View click listeners
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*/
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private fun clickListeners() {
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btnFeatureOne.setOnClickListener {
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startActivity(Intent(this, FeatureOneActivity::class.java))
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}
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btnFeatureTwo.setOnClickListener {
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startActivity(Intent(this, FeatureTwoActivity::class.java))
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}
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}
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}

‎app/src/main/java/com/ysfcyln/daggermultimodule/MyApp.kt

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package com.ysfcyln.daggermultimodule
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import android.app.Application
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import com.ysfcyln.daggermultimodule.di.DiProvider
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import com.ysfcyln.daggermultimodule.di.SubComponents
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class MyApp : Application(), SubComponents {
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override fun onCreate() {
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super.onCreate()
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DiProvider.buildDi(this)
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}
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}

‎app/src/main/java/com/ysfcyln/daggermultimodule/di/AppComponent.kt

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package com.ysfcyln.daggermultimodule.di
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import android.app.Application
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import com.ysfcyln.base.BaseModule
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import com.ysfcyln.daggermultimodule.di.main.MainComponent
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import com.ysfcyln.feature_one.di.FeatureOneComponent
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import com.ysfcyln.feature_three.di.FeatureThreeComponent
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import com.ysfcyln.feature_two.di.FeatureTwoComponent
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import dagger.BindsInstance
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import dagger.Component
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import javax.inject.Singleton
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@Singleton
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@Component(
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modules = [
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BaseModule::class,
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SubComponentsModule::class
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]
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)
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interface AppComponent {
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/**
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* A {@see [Component.Factory]} that initializes necessary implementations
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*/
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@Component.Factory
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interface Factory {
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fun create(@BindsInstance application: Application): AppComponent
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}
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// Save the reference of factories in the app component for creating sub components
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fun mainComponent() : MainComponent.Factory
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// Save the reference of factories in the app component for creating sub components
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fun featureOneComponent() : FeatureOneComponent.Factory
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// Save the reference of factories in the app component for creating sub components
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fun featureTwoComponent() : FeatureTwoComponent.Factory
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// Save the reference of factories in the app component for creating sub components
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fun featureThreeComponent() : FeatureThreeComponent.Factory
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}

‎app/src/main/java/com/ysfcyln/daggermultimodule/di/DiProvider.kt

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package com.ysfcyln.daggermultimodule.di
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import android.app.Application
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object DiProvider {
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private lateinit var appComponent: AppComponent
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@JvmStatic
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fun appComponent() = appComponent
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fun buildDi(application: Application) {
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appComponent = DaggerAppComponent.factory().create(application)
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}
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}

‎app/src/main/java/com/ysfcyln/daggermultimodule/di/SubComponents.kt

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package com.ysfcyln.daggermultimodule.di
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import com.ysfcyln.daggermultimodule.di.main.MainComponent
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import com.ysfcyln.daggermultimodule.di.main.MainComponentProvider
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import com.ysfcyln.feature_one.di.FeatureOneComponent
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import com.ysfcyln.feature_one.di.FeatureOneComponentProvider
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import com.ysfcyln.feature_three.di.FeatureThreeComponent
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import com.ysfcyln.feature_three.di.FeatureThreeComponentProvider
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import com.ysfcyln.feature_two.di.FeatureTwoComponent
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import com.ysfcyln.feature_two.di.FeatureTwoComponentProvider
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interface SubComponents: MainComponentProvider, FeatureOneComponentProvider, FeatureTwoComponentProvider,
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FeatureThreeComponentProvider {
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override fun provideMainComponent(): MainComponent {
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return DiProvider.appComponent().mainComponent().create()
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}
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override fun provideFeatureOneComponent(): FeatureOneComponent {
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return DiProvider.appComponent().featureOneComponent().create()
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}
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override fun provideFeatureTwoComponent(): FeatureTwoComponent {
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return DiProvider.appComponent().featureTwoComponent().create()
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}
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override fun provideFeatureThreeComponent(): FeatureThreeComponent {
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return DiProvider.appComponent().featureThreeComponent().create()
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}
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}

‎app/src/main/java/com/ysfcyln/daggermultimodule/di/SubComponentsModule.kt

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package com.ysfcyln.daggermultimodule.di
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import com.ysfcyln.daggermultimodule.di.main.MainComponent
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import com.ysfcyln.feature_one.di.FeatureOneComponent
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import com.ysfcyln.feature_three.di.FeatureThreeComponent
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import com.ysfcyln.feature_two.di.FeatureTwoComponent
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import dagger.Module
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/**
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* Associate SubComponents with AppComponent
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*/
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@Module(
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subcomponents = [
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MainComponent::class,
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FeatureOneComponent::class,
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FeatureTwoComponent::class,
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FeatureThreeComponent::class
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]
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)
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class SubComponentsModule {
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}

‎app/src/main/java/com/ysfcyln/daggermultimodule/di/main/MainComponent.kt

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package com.ysfcyln.daggermultimodule.di.main
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import com.ysfcyln.daggermultimodule.MainActivity
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import dagger.Subcomponent
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@Subcomponent(
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modules = [
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// Bounded main activity necessary modules comes here
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]
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)
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interface MainComponent {
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@Subcomponent.Factory
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interface Factory {
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fun create() : MainComponent
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}
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fun inject(mainActivity: MainActivity) // Add main activity to Dagger graph
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}

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