今日から始める依存性の注入 / First Time Dependency Injection

ࠓ೔͔Β࢝ΊΔґଘੑͷ஫ೖ
First Time Dependency Injection
Keisuke Kobayashi
DroidKaigi 2019 / Room1, 2019/02/08 14:50~15:20

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ࣗݾ঺հ
• Keisuke Kobayashi
• Twitter: @kobakei122
• GitHub: @kobakei
• Merpay, Inc. / Engineering Manager
• Studyplus, Inc. / ٕज़ސ໰ʢ෭ۀʣ

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ࠓ೔ͷςʔϚ
• DIॳ৺ऀɺ·ͨ͸ʮงғؾͰDagger2Λ࢖͍ͬͯΔਓʯʹɺDI
ͱ͸Ͳ͏͍͏΋ͷ͔ɺԿͷͨΊʹಋೖ͢Δͷ͔Λղઆ͢Δηο
γϣϯͰ͢
• ݸผͷDIίϯςφͷৄ͍͠࢖͍ํʹ͸࣌ؒͷؔ܎্ਂೖΓ͠·
ͤΜ

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ΞδΣϯμ
• Dependency Injection(DI)ͱ͸ʁ
• AndroidΞϓϦ։ൃΛྫʹ঺հ
• DIίϯςφͷجຊతͳ࢖͍ํ
• Dagger2 & Koin
• DIಋೖޙͷςετͷॻ͖ํ

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Dependency Injection (DI)ͱ͸ʁ
• ίϯϙʔωϯτؒͷґଘؔ܎Λιʔείʔυ͔Βഉআ͠ɺ֎෦
͔ΒґଘίϯϙʔωϯτΛ஫ೖͤ͞ΔσβΠϯύλʔϯ
• ґଘؔ܎Λഉআ͢Δ͜ͱͰɺίϯϙʔωϯτ͕ؒૄ݁߹ʹͳΔ

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DIͷϝϦοτ
• ίϯϙʔωϯτ͕ؒૄ݁߹ʹͳΔ͜ͱͰɺҎԼͷϝϦοτ͕͋
Δ
• ΞϓϦέʔγϣϯΛ֦ு͠΍͘͢ͳΔ
• ςετ͕ॻ͖΍͘͢ͳΔ
• ͜Ε͸ޙͰৄ͘͠ղઆ

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AndroidΞϓϦ։ൃͰ
Α͋͘ΔέʔεΛߟ͑Δ

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Α͋͘ΔMVPͷྫ
HogeActivity
HogePresenter
UserRepository
ApiClient UserDao

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// DIΛಋೖ͍ͯ͠ͳ͍ίʔυ
// ApiClientͱUserDaoʹґଘͨ͠ϦϙδτϦΫϥε
class UserRepository {
private val apiClient: ApiClient = ApiClientImpl()
private val userDao: UserDao = UserDaoImpl()
fun find(id:Long): Single =
return if (userDao.cached) {
userDao.find(id)
} else {
apiClient.getUser(id)
}
}
// UserRepositoryΛ࢖͏ଆ
val repo = UserRepository()
repo.find(123)...

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private val userDao: UserDao = UserDaoImpl()
userDao.find(id)
} else {
}
}
repo.find(123)...
ґଘΦϒδΣΫτͱ 
ີ݁߹͍ͯ͠Δ

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class UserRepository(
private val apiClient: ApiClient,
private val userDao: UserDao
) {
userDao.find(id)
} else {
}
}
val apiClient = ApiClientImpl()
val userDao = UserDaoImpl()
val repo = UserRepository(apiClient, userDao)
repo.find(123)...

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) {
userDao.find(id)
} else {
}
}
repo.find(123)...
ίϯετϥΫλͰ 
ґଘΦϒδΣΫτΛ
ड͚औΔ

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) {
userDao.find(id)
} else {
}
}
repo.find(123)...
࢖͏ଆ͕ґଘΦϒδΣΫτ͔Β 
૊Έཱ͍ͯͯΔ

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// ґଘΦϒδΣΫτΛղܾ͢ΔͨΊͷίϯςφΦϒδΣΫτ
object Container {
val apiClient: ApiClient = ApiClientImpl()
val userDao: UserDao = UserDaoImpl()
val userRepo: UserRepository =
UserRepository(apiClient, userDao)
}

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) {
fun find(id: Long): Single =
userDao.find(id)
} else {
}
}
val repo = Container.userRepo
repo.find(123)...
UserRepositoryͷґଘؔ܎
͕ഉআ͞Εͨ

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Α͋͘ΔMVPͷྫ
HogeActivity
HogePresenter
UserRepository
ApiClient UserDao

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Activityͷ৔߹
• ίϯετϥΫλͰͷ஫ೖ͕Ͱ͖ͳ͍
• Fragment, Service, BroadcastReceiverͳͲ΋ಉ͡

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class HogeActivity : AppCompatActivity() {
private val presenter = HogePresenter()
override fun onCreate(savedInstanceState: Bundle?) {
// লུ
}
fun onButtonClick(view: View) {
presenter.onButtonClick()
}
}
Activity͕
HogePresenterʹ 
ີ݁߹͍ͯ͠Δ

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private lateinit var presenter: HogePresenter
// লུ
presenter = HogePresenter(applicationContext)
}
}
}
͜Ε΋ີ݁߹͍ͯ͠Δ

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// ґଘΦϒδΣΫτΛղܾ͢ΔͨΊͷίϯςφΦϒδΣΫτ
object Container {
val apiClient: ApiClient = ApiClientImpl()
val userDao: UserDao = UserDaoImpl()
val userRepo: UserRepository =
UserRepository(apiClient, userDao)
private var hogePresenter: HogePresenter? = null
fun resolveHogePresenter(context: Context): HogePresenter {
if (hogePresenter == null) {
hogePresenter = HogePresenter(context, userRepo)
}
return requireNotNull(hogePresenter)
}
}
ContextΛҾ਺ʹऔΔϝιουΛ௥Ճ

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// DIΛಋೖޙͷίʔυ
private val presenter: HogePresenter by lazy {
Container.resolveHogePresenter(applicationContext)
}
// লུ
}ɹ
}
}
by lazyΛ࢖͏͜ͱͰɺ
Application ContextΛ౉ͤΔ

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͜͜ͰؾʹͳΔ͜ͱ͕

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PresenterͷϥΠϑαΠΫϧ͜ΕͰେৎ෉ʁ
• Presenter͸Activityͱಉ͡ϥΠϑαΠΫϧʹ͍ͨ͠
• Activity͕ੜ੒͞ΕΔͱPresenter΋ੜ੒͞ΕɺActivity͕ഁغ
͞ΕΔͱಉ࣌ʹഁغ͞ΕΔ΂͖
• ActivityͷΠϯελϯε͕2ͭ͋Δͱ͖͸ɺͦΕͧΕʹ
Presenter͕͍ͯ΄͍͠

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είʔϓ
• ґଘΦϒδΣΫτͷੜଘظؒΛද͢
• SingletonɺActivityͱಉ͡ੜଘظؒɺͳͲ
• είʔϓ͝ͱʹґଘΦϒδΣΫτ͕ੜ੒͞Εɺ࢖͍ճ͞ΕΔΑ
͏ͳ࢓૊Έ͕ඞཁ

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HogeActivity
HogePresenter
UserRepository
ApiClient UserDao
FugaActivity
FugaPresenter

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HogeActivity
HogePresenter
UserRepository
ApiClient UserDao
FugaActivity
FugaPresenter
ը໘ڞ௨Ͱ࢖͍·Θ͍ͨ͠
֤ը໘͝ͱʹੜ੒͍ͨ͠

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HogeActivity
HogePresenter
UserRepository
ApiClient UserDao
FugaActivity
FugaPresenter
Singleton Singleton
Singleton
ActivityScope ActivityScope

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object Container {
// লུ
val userRepo = UserRepository(apiClient, logger)
}
class HogeActivityScopeContainer {
fun resolveHogePresenter(ctx: Context): HogePresenter {…}
}
class FugaActivityScopeContainer {
fun resolveFugaPresenter(ctx: Context): FugaPresenter {…}
}

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object Container {
// লུ
}
}
}
Singletonͳ
ΫϥεͷΈ

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object Container {
// লུ
}
}
}
HogeActivityͱಉ͡ 
είʔϓͷΫϥεΛฦ͢

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private val container = HogeActivityScopeContainer()
container.resolveHogePresenter(applicationContext)
}
// লུ
}ɹ
}
}
͜ͷActivityͷ
ίϯςφΛॳظԽ

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private val container = HogeActivityScopeContainer()
container.resolveHogePresenter(applicationContext)
}
// লུ
}ɹ
}
}
containerΛ࢖ͬͯ஫ೖ

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͜͜·Ͱͷ·ͱΊ
• DIͱ͸ίϯϙʔωϯτؒͷґଘؔ܎Λ֎෦ʹ௥͍ग़͢ύλʔϯ
• ґଘίϯϙʔωϯτΛ֎෦͔Βड͚औΔΑ͏ʹ͢Δ
• είʔϓ͸ΦϒδΣΫτͷੜଘظؒΛද͠ɺείʔϓ͝ͱʹίϯςφ
Λ࣋ͭ
• ͜͜·Ͱͷ࣮૷͸͋͘·Ͱղઆ༻ͷࡶͳ΋ͷͳͷͰ஫ҙʂ 
ΑΓ࣮ફతͳ࣮૷ํ๏͸࣍Ҏ߱

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DIίϯςφ

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DIίϯςφ
• DIΛ࣮ݱ͢ΔͨΊͷϥΠϒϥϦ
• ઌఔࣗ෼Ͱ࣮૷ͨ͠ContainerʢΑΓ΋ͬͱ͍͍΋ͷʣΛࣗಈ
Ͱ࡞ͬͯ͘ΕΔϥΠϒϥϦ

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AndroidͰ༗໊ͳDIίϯςφ
• Dagger2
• Koin
• Kodein
• Toothpick
• Roboguice

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Dagger2
https://google.github.io/dagger/

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Dagger2
• ݩʑSquare͕։ൃ => ݱࡏ͸Google͕fork
• Annotation processorΛ࢖༻
• ίϯύΠϧ࣌ʹґଘπϦʔʹ໰୊͕͋Δͱ෼͔Δ"
• ίϯετϥΫλ͕࢖͑ΔΫϥεͷ৔߹ɺґଘؔ܎ͷղܾΛࣗಈੜ੒Ͱ͖Δ"
• Ϗϧυ͸஗͘ͳΔ#
• υΩϡϝϯτ͕೉͍͠###

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஫ҙʂ
• Dagger2͸͔ͳΓଟػೳͰ͕͢ɺ࣌ؒͷؔ܎্͋ͬ͞Γ͔͠঺հͰ͖·
ͤΜ
• Dagger2ʹ͸AndroidʹݶΒͳ͍௨ৗ൛ͱAndroidαϙʔτ൛
ʢdagger.androidʣ͕͋Δ
• ࠓ೔͸dagger.androidͰͷActivity΁ͷ஫ೖΛ঺հ
• ʮ͓·͡ͳ͍ʯ͕େྔʹग़ͯ͘ΔͷͰ஫ҙ

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Dagger2ͷొ৔ਓ෺
• Module
• Component

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Module
• ֤ґଘΫϥεΛͲ͏ΠϯελϯεԽ͢Δ͔Λఆٛ͢ΔΫϥε
• Daggerͷ৔߹ίϯετϥΫλΛ࢖ͬͯΠϯελϯεԽ͢Δ 
Ϋϥε͸ࣗಈతʹੜ੒Ͱ͖Δɻ 
ίϯετϥΫλ͕࢖͑ͳ͍ΫϥεΛͲ͏΍ͬͯΠϯελϯεԽ
͢Δ͔͚ͩఆٛ͢Ε͹Α͍ɻ

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Α͋͘ΔMVPͷྫ
HogeActivity
HogePresenter
UserRepository
ApiClient UserDao

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class ApiClientImpl private constructor(): ApiClient {
class Builder {
fun build(): ApiClient {...}
}
override fun getUser(id: Long): Single {...}
}
class UserDaoImpl(): UserDao {
override fun find(id: Long): Single {...}
}
) {
fun find(id: Long): Single {...}
}

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class Builder {
}
}
}
) {
}
ࣗಈੜ੒Ͱ͖Δ" 
=>Moduleʹॻ͘ඞཁͳ͠
ࣗಈੜ੒Ͱ͖ͳ͍# 
=> Moduleʹॻ͘ඞཁ͋Γ

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@Module
class AppModule {
@Singleton
@Provides
fun provideApiClient(): ApiClient {
return ApiClientImpl.Builder().build()
}
}

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@Module
class AppModule {
@Singleton
@Provides
}
}
Dagger2ͷϞδϡʔϧΛҙຯ͢Δ

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@Module
class AppModule {
@Singleton
@Provides
}
}

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@Module
class AppModule {
@Singleton
@Provides
}
}
͜ͷϝιουΛґଘղܾʹ࢖͏

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@Module
class AppModule {
@Singleton
@Provides
}
}
ApiClientͷείʔϓ

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class Builder {
}
}
}
) {
}
ࣗಈੜ੒Ͱ͖Δ" 
=>Moduleʹॻ͘ඞཁͳ͠
ࣗಈੜ੒Ͱ͖ͳ͍# 
=> Moduleʹॻ͘ඞཁ͋Γ

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@Singleton
class UserRepository @Inject constructor(
) {
}
͜ͷίϯετϥΫλΛ࢖ͬͯΠϯελϯεԽ͞ΕΔ

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@Module
abstract class ActivityModule {
@ActivityScope
@ContributesAndroidInjector
abstract fun contributeHogeActivity(): HogeActivity
}
dagger.androidΛ࢖͏ͨΊͷಛघͳϞδϡʔϧ
@ProvidesϝιουΛ࣋ͨͳ͍

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@Module
abstract class ActivityModule {
@ActivityScope
@ContributesAndroidInjector
abstract fun contributeHogeActivity(): HogeActivity
}
HogeActivityʹ஫ೖ͢ΔͨΊͷϝιου

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Component
• ModuleΛ࢖ͬͯґଘ͍ͯ͠ΔΦϒδΣΫτΛੜ੒ɾ஫ೖ͢Δ 
Ϋϥε

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@Singleton
@Component(modules = [
AppModule::class,
ActivityModule::class,
AndroidInjectionModule::class
])
interface AppComponent: AndroidInjector {
@Component.Builder
abstract class Builder: AndroidInjector.Builder()
}

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@Singleton
AppModule::class,
])
@Component.Builder
}
͜ͷίϯϙʔωϯτ͕࢖͏
Ϟδϡʔϧͷ഑ྻ

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@Singleton
AppModule::class,
])
@Component.Builder
}
Android support༻ͷΠϯλϑΣʔεΛܧঝͤ͞Δ

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class App : Application(), HasActivityInjector {
@Inject
lateinit var injector: DispatchingAndroidInjector
override fun onCreate() {
super.onCreate()
// Dagger2ͷॳظԽ
DaggerAppComponent.builder()
.create(this)
.inject(this)
}
override fun activityInjector(): AndroidInjector
= injector
}

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@Inject
super.onCreate()
// Dagger2ͷॳظԽ
.create(this)
.inject(this)
}
= injector
}
Android support༻ͷΠϯλϑΣʔεΛܧঝͤ͞Δ

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@Inject
super.onCreate()
// Dagger2ͷॳظԽ
.create(this)
.inject(this)
}
= injector
}
AppʹinjectorΛ஫ೖ

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@Inject
lateinit var presenter: HogePresenter
// লུ
AndroidInjection.inject(this)
}
}
}

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@Inject
// লུ
}
}
}
ґଘΦϒδΣΫτʹ͸
@InjectΛ෇͚͓ͯ͘

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@Inject
// লུ
}
}
}
ґଘΦϒδΣΫτΛ஫ೖ

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ͳΔ΄ͲɺΘ͔ΒΜ
• େৎ෉
• ଟ෼ΈΜͳ࠷ॳ͸෼͔ͬͯͳ͍
• ࠓޙDaggerΛಋೖ͢Δͱ͖ʹɺ΋͏Ұ౓͜ͷࢿྉ΍ଞͷαϯϓ
ϧΛݟ௚ͤ͹OK

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Koin
https://insert-koin.io/

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Koin
• KotlinͰॻ͔ΕͨDIίϯςφ
• ҠৡϓϩύςΟΛ࢖༻ͯ͠ґଘੑΛղܾ
• Annotation processorෆ࢖༻
• Ϗϧυ଎౓ʹѱӨڹ͸ͳ͍"
• ࣮ߦ͢Δ·ͰґଘπϦʔʹ໰୊͕ͳ͍͔෼͔Βͳ͍#
• constructor injectionͰ͖ΔΫϥεͰ΋ɺϞδϡʔϧʹॻ͘ඞཁ͋Γ#
• υΩϡϝϯτ͕Θ͔Γ΍͍͢"
• AAC ViewModelʹରԠ"

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࢖͍ํ
1. moduleͷఆٛ
• ͜͜͸Dagger2ͱಉ͡
2. startKoinͰίϯςφ࡞੒
3. ஫ೖઌͷΫϥεͰҠৡϓϩύςΟΛ࢖ͬͯ஫ೖ͢Δ

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class App : Application() {
super.onCreate()
// KoinͷϞδϡʔϧͷઃఆ
val appModule = module {
single { LoggerImpl() }
factory {
ApiClientImpl.Builder().build()
}
factory {
HogeRepository(get())
}
}
// ґଘπϦʔͷ࡞੒
startKoin(this, listOf(appModule))
}
}

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super.onCreate()
factory {
}
factory {
}
}
}
}
Ϟδϡʔϧͷ࡞੒

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super.onCreate()
factory {
}
factory {
}
}
}
}
Singleton

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super.onCreate()
factory {
}
factory {
}
}
}
}
ΦϒδΣΫτΛ
ຖճ࡞੒͢ΔΫϥε

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super.onCreate()
factory {
}
factory {
}
}
}
}
getͰґଘղܾ

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super.onCreate()
factory {
}
factory {
}
}
}
} ίϯςφͷ࡞੒

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val logger: Logger by inject()
super.onCreate(savedInstanceState)
// ...
logger.v(“Hello world!”)
}
}
ҕৡϓϩύςΟΛ࢖ͬͯ஫ೖ

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AAC ViewModelʹରԠ
• ViewModel͸Factoryܦ༝ͰΠϯελϯεΛੜ੒͢Δ
• FactoryΛܧঝ͢Δ࢓૊Έ͕͋ΓɺDIͱ૊Έ߹ΘͤΔͷ͸ 
τϦοΫ͕ඞཁ
• Koin͸ରԠ͍ͯ͠Δʂ

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class HogeViewModel(
private val userRepository: UserRepository
) : ViewModel() {…}

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super.onCreate()
// ...
viewModel { HogeViewModel(get()) }
}
}
}
ViewModelͷΠϯελϯεԽ

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val hogeViewModel: HogeViewModel by viewModel()
super.onCreate(savedInstanceState)
// ...
}
hogeViewModel.onButtonClick()
}
}
ViewModel༻ͷ
ҕৡϓϩύςΟΛ࢖͏

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͜͜·Ͱͷ·ͱΊ
• DIίϯςφ = DIΛ؆୯ʹ࣮૷͢ΔͨΊͷϥΠϒϥϦ
• Dagger2…ଟػೳ͕ͩ೉͍͠ɻconstructor injectionͷ৔߹͸
ϞδϡʔϧলུՄೳɻ
• Koin…Θ͔Γ΍͍͢ɻAAC ViewModelʹରԠ͍ͯ͠Δɻ

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DIΛಋೖͯ͠Կ͕มΘͬͨʁ

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DIͷϝϦοτʢ࠶ܝʣ
• ίϯϙʔωϯτ͕ؒૄ݁߹ʹͳΔ͜ͱͰɺҎԼͷϝϦοτ͕͋
Δ
• ΞϓϦέʔγϣϯΛ֦ு͠΍͘͢ͳΔ
• ςετ͕ॻ͖΍͘͢ͳΔ
• ͜Ε͸ޙͰৄ͘͠ղઆ

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୯ମςετ

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// ςετର৅ͷΫϥεʢDIಋೖલʣ
}
ApiClientʹີ݁߹͍ͯ͠Δ

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// UserRepositoryͷςετίʔυ
class UserRepositoryTest {
@Test
fun find_isSuccess() {
repo.find(1)
.test()
.awaitCount(1)
.assertValue(expected)
}
}

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@Test
repo.find(1)
.test()
.awaitCount(1)
.assertValue(expected)
}
}
ApiClientImplͷ 
ίʔυ΋࣮ߦ͍ͯ͠Δ

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HogeActivity
HogeViewModel
UserRepository
ApiClient
͕͜͜ςετର৅ʹ
ͳͬͯ͠·͍ͬͯΔ

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HogeActivity
HogeViewModel
UserRepository
ApiClient
ຊ౰ʹςετ͍ͨ͠ͷ͸
͚ͩ͜͜

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DIΛಋೖ͍ͯ͠Δ৔߹
• ґଘίϯϙʔωϯτΛ஫ೖ͢Δͱ͖ʹɺςετʹ౎߹ͷ͍͍ 
ΦϒδΣΫτΛ࢖͏͜ͱͰɺର৅ͷΫϥεͷΈݕূՄೳ
• Mockk, MockitoͳͲͰϞοΫʹ͢Δ͜ͱ͕ଟ͍

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// ςετର৅ͷΫϥεʢDIಋೖޙʣ
private val apiClient: ApiClient
) {
}
ApiClientΛ
֎෦͔Β஫ೖՄೳ

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@Test
val apiClient = mockk {
every { getUser(any()) } returns Single.just(user)
}
val repo = UserRepository(apiClient)
repo.find(1)
.test()
.awaitCount(1)
.assertValue(user)
}
}

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@Test
}
repo.find(1)
.test()
.awaitCount(1)
.assertValue(user)
}
}
ApiClientͷϞοΫΛ࡞੒

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@Test
}
repo.find(1)
.test()
.awaitCount(1)
.assertValue(user)
}
}
ϞοΫΛ஫ೖͯ͠
ςετ࣮ߦ

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݁߹ςετ

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݁߹ςετ
• ???ʮͲ͏ͤ݁߹ͨ͠ঢ়ଶͰςετ͢Δ͔ΒDIͰίϯϙʔωϯ
τؒΛૄ݁߹ʹͯ͠΋ҙຯͳ͍Μ͡Όͳ͍Μͷʁʯ
• ͦΜͳ͜ͱ͸ͳ͍

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ྫ: EspressoͰUIςετΛॻ͘
• APIΫϥΠΞϯτͷԠ౴͕ຖճҧ͏ͷͰਏ͍
• Ϩεϙϯε͕࣌ؒʹΑͬͯҧ͏
• Ԡ౴࣌ؒ
• Α͘API͕յΕΔʢ։ൃ؀ڥͳͲʣ
• DIΛಋೖ͍ͯ͠Δͱɺ؆୯ʹAPIΫϥΠΞϯτΛςετ༻ͷϞοΫʹࠩ͠ସ͑
Δ͜ͱ͕Ͱ͖Δ

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DIίϯςφͷϞδϡʔϧΛςετ༻ʹ 
ࠩ͠ସ͑Δ
1. ςετ༻ͷApplicationΛ࡞੒͠ɺ಺෦Ͱςετ༻Ϟδϡʔϧ
Λ࢖ͬͯґଘπϦʔΛ࡞Δ
2. Instrumented test࣮ߦ࣌ʹىಈ͢ΔApplicationΫϥεΛɺ 
1Ͱ࡞ͬͨΫϥεʹࠩ͠ସ͑Δ

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open class App : Application() {
private val appModule = module {
factory { UserRepository(get()) }
viewModel { MainViewModel(get(), get()) }
}
// APIΫϥΠΞϯτ༻Ϟδϡʔϧ
protected open val apiModule = module {
factory { ApiClientImpl() }
}
super.onCreate()
// ґଘπϦʔΛߏங
startKoin(this, listOf(appModule, apiModule))
}
}

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}
}
super.onCreate()
}
}
ςετ༻ͷAppΫϥεΛ 
ܧঝͯ͠࡞ΕΔΑ͏ʹ͢Δ

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}
}
super.onCreate()
}
}
͜͜΋ΦʔόʔϥΠυ
Ͱ͖ΔΑ͏ʹ͢Δ

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class TestApp : App() {
override val apiModule = module {
factory {
val user = User(123, “kobakei”)
}
apiClient
}
}
}

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class TestApp : App() {
override val apiModule = module {
factory {
val user = User(123, “kobakei”)
}
apiClient
}
}
} ϞοΫͷAPIΫϥΠΞϯτΛฦ͢
ϞδϡʔϧͰΦʔόʔϥΠυ

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// ΞϓϦέʔγϣϯΛࠩ͠ସ͑ΔͨΊͷϥϯφʔ
class MyTestRunner : AndroidJUnitRunner() {
override fun newApplication(cl: ClassLoader?, name: String?, c: Context?) =
super.newApplication(cl, TestApp::class.java.name, c)
}
TestAppΫϥεΛىಈ͢Δ

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// app/build.gradle
android {
defaultConfig {
testInstrumentationRunner “your.app.MyTestRunner”
}
}
Instrumented test࣌ͷϥϯφʔΛࢦఆ

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ຊ೔ͷ·ͱΊ

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·ͱΊ
• DI = ίϯϙʔωϯτؒͷґଘؔ܎Λ֎෦ʹ௥͍ग़͢σβΠϯύ
λʔϯ
• DIΛಋೖ͢Δ͜ͱͰɺίϯϙʔωϯτ͕ૄ݁߹ʹͳΓɺίϯ
ϙʔωϯτΛࠩ͠ସ͑ͨΓɺςετ͕ॻ͖΍͘͢ͳΔ
• Dagger2΍KoinͳͲDIίϯςφΛར༻͠Α͏

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Thanks!!!

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今日から始める依存性の注入 / First Time Dependency Injection

今日から始める依存性の注入 / First Time Dependency Injection

Keisuke Kobayashi

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