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ࠓ͔Β࢝ΊΔґଘੑͷೖ
First Time Dependency Injection
Keisuke Kobayashi
DroidKaigi 2019 / Room1, 2019/02/08 14:50~15:20
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ࣗݾհ
• Keisuke Kobayashi
• Twitter: @kobakei122
• GitHub: @kobakei
• Merpay, Inc. / Engineering Manager
• Studyplus, Inc. / ٕज़ސʢ෭ۀʣ
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ࠓͷςʔϚ
• DIॳ৺ऀɺ·ͨʮงғؾͰDagger2Λ͍ͬͯΔਓʯʹɺDI
ͱͲ͏͍͏ͷ͔ɺԿͷͨΊʹಋೖ͢Δͷ͔Λղઆ͢Δηο
γϣϯͰ͢
• ݸผͷDIίϯςφͷৄ͍͍͠ํʹ࣌ؒͷ্ؔਂೖΓ͠·
ͤΜ
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ΞδΣϯμ
• Dependency Injection(DI)ͱʁ
• AndroidΞϓϦ։ൃΛྫʹհ
• DIίϯςφͷجຊతͳ͍ํ
• Dagger2 & Koin
• DIಋೖޙͷςετͷॻ͖ํ
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Dependency Injection (DI)ͱʁ
• ίϯϙʔωϯτؒͷґଘؔΛιʔείʔυ͔Βഉআ͠ɺ֎෦
͔ΒґଘίϯϙʔωϯτΛೖͤ͞ΔσβΠϯύλʔϯ
• ґଘؔΛഉআ͢Δ͜ͱͰɺίϯϙʔωϯτ͕ؒૄ݁߹ʹͳΔ
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DIͷϝϦοτ
• ίϯϙʔωϯτ͕ؒૄ݁߹ʹͳΔ͜ͱͰɺҎԼͷϝϦοτ͕͋
Δ
• ΞϓϦέʔγϣϯΛ֦ு͘͢͠ͳΔ
• ςετ͕ॻ͖͘͢ͳΔ
• ͜ΕޙͰৄ͘͠ղઆ
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AndroidΞϓϦ։ൃͰ
Α͋͘ΔέʔεΛߟ͑Δ
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Α͋͘ΔMVPͷྫ
HogeActivity
HogePresenter
UserRepository
ApiClient UserDao
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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)
}
}
// UserRepositoryΛ͏ଆ
val repo = UserRepository()
repo.find(123)...
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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)
}
}
// UserRepositoryΛ͏ଆ
val repo = UserRepository()
repo.find(123)...
ґଘΦϒδΣΫτͱ
ີ݁߹͍ͯ͠Δ
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// ApiClientͱUserDaoʹґଘͨ͠ϦϙδτϦΫϥε
class UserRepository(
private val apiClient: ApiClient,
private val userDao: UserDao
) {
fun find(id:Long): Single =
return if (userDao.cached) {
userDao.find(id)
} else {
apiClient.getUser(id)
}
}
// UserRepositoryΛ͏ଆ
val apiClient = ApiClientImpl()
val userDao = UserDaoImpl()
val repo = UserRepository(apiClient, userDao)
repo.find(123)...
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// ApiClientͱUserDaoʹґଘͨ͠ϦϙδτϦΫϥε
class UserRepository(
private val apiClient: ApiClient,
private val userDao: UserDao
) {
fun find(id:Long): Single =
return if (userDao.cached) {
userDao.find(id)
} else {
apiClient.getUser(id)
}
}
// UserRepositoryΛ͏ଆ
val apiClient = ApiClientImpl()
val userDao = UserDaoImpl()
val repo = UserRepository(apiClient, userDao)
repo.find(123)...
ίϯετϥΫλͰ
ґଘΦϒδΣΫτΛ
ड͚औΔ
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// ApiClientͱUserDaoʹґଘͨ͠ϦϙδτϦΫϥε
class UserRepository(
private val apiClient: ApiClient,
private val userDao: UserDao
) {
fun find(id:Long): Single =
return if (userDao.cached) {
userDao.find(id)
} else {
apiClient.getUser(id)
}
}
// UserRepositoryΛ͏ଆ
val apiClient = ApiClientImpl()
val userDao = UserDaoImpl()
val repo = UserRepository(apiClient, userDao)
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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// ApiClientͱUserDaoʹґଘͨ͠ϦϙδτϦΫϥε
class UserRepository(
private val apiClient: ApiClient,
private val userDao: UserDao
) {
fun find(id: Long): Single =
return if (userDao.cached) {
userDao.find(id)
} else {
apiClient.getUser(id)
}
}
// UserRepositoryΛ͏ଆ
val repo = Container.userRepo
repo.find(123)...
UserRepositoryͷґଘؔ
͕ഉআ͞Εͨ
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Α͋͘ΔMVPͷྫ
HogeActivity
HogePresenter
UserRepository
ApiClient UserDao
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Activityͷ߹
• ίϯετϥΫλͰͷೖ͕Ͱ͖ͳ͍
• Fragment, Service, BroadcastReceiverͳͲಉ͡
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// DIΛಋೖ͍ͯ͠ͳ͍ίʔυ
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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// DIΛಋೖ͍ͯ͠ͳ͍ίʔυ
class HogeActivity : AppCompatActivity() {
private lateinit var presenter: HogePresenter
override fun onCreate(savedInstanceState: Bundle?) {
// লུ
presenter = HogePresenter(applicationContext)
}
fun onButtonClick(view: View) {
presenter.onButtonClick()
}
}
͜Εີ݁߹͍ͯ͠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)
}
}
ContextΛҾʹऔΔϝιουΛՃ
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// DIΛಋೖޙͷίʔυ
class HogeActivity : AppCompatActivity() {
private val presenter: HogePresenter by lazy {
Container.resolveHogePresenter(applicationContext)
}
override fun onCreate(savedInstanceState: Bundle?) {
// লུ
}ɹ
fun onButtonClick(view: View) {
presenter.onButtonClick()
}
}
by lazyΛ͏͜ͱͰɺ
Application ContextΛͤΔ
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͜͜ͰؾʹͳΔ͜ͱ͕
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PresenterͷϥΠϑαΠΫϧ͜ΕͰେৎʁ
• PresenterActivityͱಉ͡ϥΠϑαΠΫϧʹ͍ͨ͠
• Activity͕ੜ͞ΕΔͱPresenterੜ͞ΕɺActivity͕ഁغ
͞ΕΔͱಉ࣌ʹഁغ͞ΕΔ͖
• ActivityͷΠϯελϯε͕2ͭ͋Δͱ͖ɺͦΕͧΕʹ
Presenter͕͍ͯ΄͍͠
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είʔϓ
• ґଘΦϒδΣΫτͷੜଘظؒΛද͢
• SingletonɺActivityͱಉ͡ੜଘظؒɺͳͲ
• είʔϓ͝ͱʹґଘΦϒδΣΫτ͕ੜ͞Εɺ͍ճ͞ΕΔΑ
͏ͳΈ͕ඞཁ
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HogeActivity
HogePresenter
UserRepository
ApiClient UserDao
FugaActivity
FugaPresenter
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HogeActivity
HogePresenter
UserRepository
ApiClient UserDao
FugaActivity
FugaPresenter
ը໘ڞ௨Ͱ͍·Θ͍ͨ͠
֤ը໘͝ͱʹੜ͍ͨ͠
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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
val userRepo = UserRepository(apiClient, logger)
}
class HogeActivityScopeContainer {
fun resolveHogePresenter(ctx: Context): HogePresenter {…}
}
class FugaActivityScopeContainer {
fun resolveFugaPresenter(ctx: Context): FugaPresenter {…}
}
Singletonͳ
ΫϥεͷΈ
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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 {…}
}
HogeActivityͱಉ͡
είʔϓͷΫϥεΛฦ͢
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// DIΛಋೖޙͷίʔυ
class HogeActivity : AppCompatActivity() {
private val container = HogeActivityScopeContainer()
private val presenter: HogePresenter by lazy {
container.resolveHogePresenter(applicationContext)
}
override fun onCreate(savedInstanceState: Bundle?) {
// লུ
}ɹ
fun onButtonClick(view: View) {
presenter.onButtonClick()
}
}
͜ͷActivityͷ
ίϯςφΛॳظԽ
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// DIΛಋೖޙͷίʔυ
class HogeActivity : AppCompatActivity() {
private val container = HogeActivityScopeContainer()
private val presenter: HogePresenter by lazy {
container.resolveHogePresenter(applicationContext)
}
override fun onCreate(savedInstanceState: Bundle?) {
// লུ
}ɹ
fun onButtonClick(view: View) {
presenter.onButtonClick()
}
}
containerΛͬͯೖ
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͜͜·Ͱͷ·ͱΊ
• DIͱίϯϙʔωϯτؒͷґଘؔΛ֎෦ʹ͍ग़͢ύλʔϯ
• ґଘίϯϙʔωϯτΛ֎෦͔Βड͚औΔΑ͏ʹ͢Δ
• είʔϓΦϒδΣΫτͷੜଘظؒΛද͠ɺείʔϓ͝ͱʹίϯςφ
Λ࣋ͭ
• ͜͜·Ͱͷ࣮͋͘·Ͱղઆ༻ͷࡶͳͷͳͷͰҙʂ
ΑΓ࣮ફతͳ࣮ํ๏࣍Ҏ߱
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DIίϯςφ
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DIίϯςφ
• DIΛ࣮ݱ͢ΔͨΊͷϥΠϒϥϦ
• ઌఔࣗͰ࣮ͨ͠ContainerʢΑΓͬͱ͍͍ͷʣΛࣗಈ
Ͱ࡞ͬͯ͘ΕΔϥΠϒϥϦ
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AndroidͰ༗໊ͳDIίϯςφ
• Dagger2
• Koin
• Kodein
• Toothpick
• Roboguice
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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։ൃ => ݱࡏGoogle͕fork
• Annotation processorΛ༻
• ίϯύΠϧ࣌ʹґଘπϦʔʹ͕͋Δͱ͔Δ"
• ίϯετϥΫλ͕͑ΔΫϥεͷ߹ɺґଘؔͷղܾΛࣗಈੜͰ͖Δ"
• Ϗϧυ͘ͳΔ#
• υΩϡϝϯτ͕͍͠###
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ҙʂ
• Dagger2͔ͳΓଟػೳͰ͕͢ɺ࣌ؒͷ্ؔ͋ͬ͞Γ͔͠հͰ͖·
ͤΜ
• Dagger2ʹAndroidʹݶΒͳ͍௨ৗ൛ͱAndroidαϙʔτ൛
ʢdagger.androidʣ͕͋Δ
• ࠓdagger.androidͰͷActivityͷೖΛհ
• ʮ͓·͡ͳ͍ʯ͕େྔʹग़ͯ͘ΔͷͰҙ
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Dagger2ͷొਓ
• Module
• Component
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Module
• ֤ґଘΫϥεΛͲ͏ΠϯελϯεԽ͢Δ͔Λఆٛ͢ΔΫϥε
• Daggerͷ߹ίϯετϥΫλΛͬͯΠϯελϯεԽ͢Δ
ΫϥεࣗಈతʹੜͰ͖Δɻ
ίϯετϥΫλ͕͑ͳ͍ΫϥεΛͲ͏ͬͯΠϯελϯεԽ
͢Δ͔͚ͩఆٛ͢ΕΑ͍ɻ
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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 {...}
}
class UserRepository(
private val apiClient: ApiClient,
private val userDao: UserDao
) {
fun find(id: Long): Single {...}
}
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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 {...}
}
class UserRepository(
private val apiClient: ApiClient,
private val userDao: UserDao
) {
fun find(id: Long): Single {...}
}
ࣗಈੜͰ͖Δ"
=>Moduleʹॻ͘ඞཁͳ͠
ࣗಈੜͰ͖ͳ͍#
=> 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
fun provideApiClient(): ApiClient {
return ApiClientImpl.Builder().build()
}
}
Dagger2ͷϞδϡʔϧΛҙຯ͢Δ
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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
fun provideApiClient(): ApiClient {
return ApiClientImpl.Builder().build()
}
}
͜ͷϝιουΛґଘղܾʹ͏
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@Module
class AppModule {
@Singleton
@Provides
fun provideApiClient(): ApiClient {
return ApiClientImpl.Builder().build()
}
}
ApiClientͷείʔϓ
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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 {...}
}
class UserRepository(
private val apiClient: ApiClient,
private val userDao: UserDao
) {
fun find(id: Long): Single {...}
}
ࣗಈੜͰ͖Δ"
=>Moduleʹॻ͘ඞཁͳ͠
ࣗಈੜͰ͖ͳ͍#
=> Moduleʹॻ͘ඞཁ͋Γ
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@Singleton
class UserRepository @Inject constructor(
private val apiClient: ApiClient,
private val userDao: UserDao
) {
fun find(id: Long): Single {...}
}
͜ͷίϯετϥΫλΛͬͯΠϯελϯεԽ͞ΕΔ
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@Module
abstract class ActivityModule {
@ActivityScope
@ContributesAndroidInjector
abstract fun contributeHogeActivity(): HogeActivity
}
dagger.androidΛ͏ͨΊͷಛघͳϞδϡʔϧ
@ProvidesϝιουΛ࣋ͨͳ͍
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@Module
abstract class ActivityModule {
@ActivityScope
@ContributesAndroidInjector
abstract fun contributeHogeActivity(): HogeActivity
}
HogeActivityʹೖ͢ΔͨΊͷϝιου
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Component
• ModuleΛͬͯґଘ͍ͯ͠ΔΦϒδΣΫτΛੜɾೖ͢Δ
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
@Component(modules = [
AppModule::class,
ActivityModule::class,
AndroidInjectionModule::class
])
interface AppComponent: AndroidInjector {
@Component.Builder
abstract class Builder: AndroidInjector.Builder()
}
͜ͷίϯϙʔωϯτ͕͏
Ϟδϡʔϧͷྻ
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@Singleton
@Component(modules = [
AppModule::class,
ActivityModule::class,
AndroidInjectionModule::class
])
interface AppComponent: AndroidInjector {
@Component.Builder
abstract class Builder: AndroidInjector.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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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
}
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
}
AppʹinjectorΛೖ
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class HogeActivity : AppCompatActivity() {
@Inject
lateinit var presenter: HogePresenter
override fun onCreate(savedInstanceState: Bundle?) {
// লུ
AndroidInjection.inject(this)
}
fun onButtonClick(view: View) {
presenter.onButtonClick()
}
}
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class HogeActivity : AppCompatActivity() {
@Inject
lateinit var presenter: HogePresenter
override fun onCreate(savedInstanceState: Bundle?) {
// লུ
AndroidInjection.inject(this)
}
fun onButtonClick(view: View) {
presenter.onButtonClick()
}
}
ґଘΦϒδΣΫτʹ
@InjectΛ͚͓ͯ͘
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class HogeActivity : AppCompatActivity() {
@Inject
lateinit var presenter: HogePresenter
override fun onCreate(savedInstanceState: Bundle?) {
// লུ
AndroidInjection.inject(this)
}
fun onButtonClick(view: View) {
presenter.onButtonClick()
}
}
ґଘΦϒδΣΫτΛೖ
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ͳΔ΄ͲɺΘ͔ΒΜ
• େৎ
• ଟΈΜͳ࠷ॳ͔ͬͯͳ͍
• ࠓޙDaggerΛಋೖ͢Δͱ͖ʹɺ͏Ұ͜ͷࢿྉଞͷαϯϓ
ϧΛݟͤOK
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Koin
https://insert-koin.io/
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Koin
• KotlinͰॻ͔ΕͨDIίϯςφ
• ҠৡϓϩύςΟΛ༻ͯ͠ґଘੑΛղܾ
• Annotation processorෆ༻
• ϏϧυʹѱӨڹͳ͍"
• ࣮ߦ͢Δ·ͰґଘπϦʔʹ͕ͳ͍͔͔Βͳ͍#
• constructor injectionͰ͖ΔΫϥεͰɺϞδϡʔϧʹॻ͘ඞཁ͋Γ#
• υΩϡϝϯτ͕Θ͔Γ͍͢"
• AAC ViewModelʹରԠ"
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͍ํ
1. moduleͷఆٛ
• ͜͜Dagger2ͱಉ͡
2. startKoinͰίϯςφ࡞
3. ೖઌͷΫϥεͰҠৡϓϩύςΟΛͬͯೖ͢Δ
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class App : Application() {
override fun onCreate() {
super.onCreate()
// KoinͷϞδϡʔϧͷઃఆ
val appModule = module {
single { LoggerImpl() }
factory {
ApiClientImpl.Builder().build()
}
factory {
HogeRepository(get())
}
}
// ґଘπϦʔͷ࡞
startKoin(this, listOf(appModule))
}
}
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class App : Application() {
override fun onCreate() {
super.onCreate()
// KoinͷϞδϡʔϧͷઃఆ
val appModule = module {
single { LoggerImpl() }
factory {
ApiClientImpl.Builder().build()
}
factory {
HogeRepository(get())
}
}
// ґଘπϦʔͷ࡞
startKoin(this, listOf(appModule))
}
}
Ϟδϡʔϧͷ࡞
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class App : Application() {
override fun onCreate() {
super.onCreate()
// KoinͷϞδϡʔϧͷઃఆ
val appModule = module {
single { LoggerImpl() }
factory {
ApiClientImpl.Builder().build()
}
factory {
HogeRepository(get())
}
}
// ґଘπϦʔͷ࡞
startKoin(this, listOf(appModule))
}
}
Singleton
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class App : Application() {
override fun onCreate() {
super.onCreate()
// KoinͷϞδϡʔϧͷઃఆ
val appModule = module {
single { LoggerImpl() }
factory {
ApiClientImpl.Builder().build()
}
factory {
HogeRepository(get())
}
}
// ґଘπϦʔͷ࡞
startKoin(this, listOf(appModule))
}
}
ΦϒδΣΫτΛ
ຖճ࡞͢ΔΫϥε
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class App : Application() {
override fun onCreate() {
super.onCreate()
// KoinͷϞδϡʔϧͷઃఆ
val appModule = module {
single { LoggerImpl() }
factory {
ApiClientImpl.Builder().build()
}
factory {
HogeRepository(get())
}
}
// ґଘπϦʔͷ࡞
startKoin(this, listOf(appModule))
}
}
getͰґଘղܾ
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class App : Application() {
override fun onCreate() {
super.onCreate()
// KoinͷϞδϡʔϧͷઃఆ
val appModule = module {
single { LoggerImpl() }
factory {
ApiClientImpl.Builder().build()
}
factory {
HogeRepository(get())
}
}
// ґଘπϦʔͷ࡞
startKoin(this, listOf(appModule))
}
} ίϯςφͷ࡞
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class HogeActivity : AppCompatActivity() {
val logger: Logger by inject()
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
// ...
logger.v(“Hello world!”)
}
}
ҕৡϓϩύςΟΛͬͯೖ
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AAC ViewModelʹରԠ
• ViewModelFactoryܦ༝ͰΠϯελϯεΛੜ͢Δ
• FactoryΛܧঝ͢ΔΈ͕͋ΓɺDIͱΈ߹ΘͤΔͷ
τϦοΫ͕ඞཁ
• KoinରԠ͍ͯ͠Δʂ
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class HogeViewModel(
private val userRepository: UserRepository
) : ViewModel() {…}
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class App : Application() {
override fun onCreate() {
super.onCreate()
// KoinͷϞδϡʔϧͷઃఆ
val appModule = module {
// ...
viewModel { HogeViewModel(get()) }
}
startKoin(this, listOf(appModule))
}
}
ViewModelͷΠϯελϯεԽ
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class HogeActivity : AppCompatActivity() {
val hogeViewModel: HogeViewModel by viewModel()
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
// ...
}
fun onButtonClick(view: View) {
hogeViewModel.onButtonClick()
}
}
ViewModel༻ͷ
ҕৡϓϩύςΟΛ͏
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͜͜·Ͱͷ·ͱΊ
• DIίϯςφ = DIΛ؆୯ʹ࣮͢ΔͨΊͷϥΠϒϥϦ
• Dagger2…ଟػೳ͕͍ͩ͠ɻconstructor injectionͷ߹
ϞδϡʔϧলུՄೳɻ
• Koin…Θ͔Γ͍͢ɻAAC ViewModelʹରԠ͍ͯ͠Δɻ
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DIΛಋೖͯ͠Կ͕มΘͬͨʁ
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DIͷϝϦοτʢ࠶ܝʣ
• ίϯϙʔωϯτ͕ؒૄ݁߹ʹͳΔ͜ͱͰɺҎԼͷϝϦοτ͕͋
Δ
• ΞϓϦέʔγϣϯΛ֦ு͘͢͠ͳΔ
• ςετ͕ॻ͖͘͢ͳΔ
• ͜ΕޙͰৄ͘͠ղઆ
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୯ମςετ
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// ςετରͷΫϥεʢDIಋೖલʣ
class UserRepository {
private val apiClient: ApiClient = ApiClientImpl()
fun find(id: Long): Single =
apiClient.getUser(id)
}
ApiClientʹີ݁߹͍ͯ͠Δ
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// UserRepositoryͷςετίʔυ
class UserRepositoryTest {
@Test
fun find_isSuccess() {
val repo = UserRepository()
repo.find(1)
.test()
.awaitCount(1)
.assertValue(expected)
}
}
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// UserRepositoryͷςετίʔυ
class UserRepositoryTest {
@Test
fun find_isSuccess() {
val repo = UserRepository()
repo.find(1)
.test()
.awaitCount(1)
.assertValue(expected)
}
}
ApiClientImplͷ
ίʔυ࣮ߦ͍ͯ͠Δ
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HogeActivity
HogeViewModel
UserRepository
ApiClient
͕͜͜ςετରʹ
ͳͬͯ͠·͍ͬͯΔ
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HogeActivity
HogeViewModel
UserRepository
ApiClient
ຊʹςετ͍ͨ͠ͷ
͚ͩ͜͜
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DIΛಋೖ͍ͯ͠Δ߹
• ґଘίϯϙʔωϯτΛೖ͢Δͱ͖ʹɺςετʹ߹ͷ͍͍
ΦϒδΣΫτΛ͏͜ͱͰɺରͷΫϥεͷΈݕূՄೳ
• Mockk, MockitoͳͲͰϞοΫʹ͢Δ͜ͱ͕ଟ͍
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// ςετରͷΫϥεʢDIಋೖޙʣ
class UserRepository(
private val apiClient: ApiClient
) {
fun find(id: Long): Single =
apiClient.getUser(id)
}
ApiClientΛ
֎෦͔ΒೖՄೳ
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// UserRepositoryͷςετίʔυ
class UserRepositoryTest {
@Test
fun find_isSuccess() {
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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// UserRepositoryͷςετίʔυ
class UserRepositoryTest {
@Test
fun find_isSuccess() {
val apiClient = mockk {
every { getUser(any()) } returns Single.just(user)
}
val repo = UserRepository(apiClient)
repo.find(1)
.test()
.awaitCount(1)
.assertValue(user)
}
}
ApiClientͷϞοΫΛ࡞
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// UserRepositoryͷςετίʔυ
class UserRepositoryTest {
@Test
fun find_isSuccess() {
val apiClient = mockk {
every { getUser(any()) } returns Single.just(user)
}
val repo = UserRepository(apiClient)
repo.find(1)
.test()
.awaitCount(1)
.assertValue(user)
}
}
ϞοΫΛೖͯ͠
ςετ࣮ߦ
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݁߹ςετ
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݁߹ςετ
• ???ʮͲ͏ͤ݁߹ͨ͠ঢ়ଶͰςετ͢Δ͔ΒDIͰίϯϙʔωϯ
τؒΛૄ݁߹ʹͯ͠ҙຯͳ͍Μ͡Όͳ͍Μͷʁʯ
• ͦΜͳ͜ͱͳ͍
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ྫ: EspressoͰUIςετΛॻ͘
• APIΫϥΠΞϯτͷԠ͕ຖճҧ͏ͷͰਏ͍
• Ϩεϙϯε͕࣌ؒʹΑͬͯҧ͏
• Ԡ࣌ؒ
• Α͘API͕յΕΔʢ։ൃڥͳͲʣ
• DIΛಋೖ͍ͯ͠Δͱɺ؆୯ʹAPIΫϥΠΞϯτΛςετ༻ͷϞοΫʹࠩ͠ସ͑
Δ͜ͱ͕Ͱ͖Δ
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DIίϯςφͷϞδϡʔϧΛςετ༻ʹ
ࠩ͠ସ͑Δ
1. ςετ༻ͷApplicationΛ࡞͠ɺ෦Ͱςετ༻Ϟδϡʔϧ
ΛͬͯґଘπϦʔΛ࡞Δ
2. Instrumented test࣮ߦ࣌ʹىಈ͢ΔApplicationΫϥεΛɺ
1Ͱ࡞ͬͨΫϥεʹࠩ͠ସ͑Δ
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open class App : Application() {
private val appModule = module {
single { LoggerImpl() }
factory { UserRepository(get()) }
viewModel { MainViewModel(get(), get()) }
}
// APIΫϥΠΞϯτ༻Ϟδϡʔϧ
protected open val apiModule = module {
factory { ApiClientImpl() }
}
override fun onCreate() {
super.onCreate()
// ґଘπϦʔΛߏங
startKoin(this, listOf(appModule, apiModule))
}
}
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open class App : Application() {
private val appModule = module {
single { LoggerImpl() }
factory { UserRepository(get()) }
viewModel { MainViewModel(get(), get()) }
}
// APIΫϥΠΞϯτ༻Ϟδϡʔϧ
protected open val apiModule = module {
factory { ApiClientImpl() }
}
override fun onCreate() {
super.onCreate()
// ґଘπϦʔΛߏங
startKoin(this, listOf(appModule, apiModule))
}
}
ςετ༻ͷAppΫϥεΛ
ܧঝͯ͠࡞ΕΔΑ͏ʹ͢Δ
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open class App : Application() {
private val appModule = module {
single { LoggerImpl() }
factory { UserRepository(get()) }
viewModel { MainViewModel(get(), get()) }
}
// APIΫϥΠΞϯτ༻Ϟδϡʔϧ
protected open val apiModule = module {
factory { ApiClientImpl() }
}
override fun onCreate() {
super.onCreate()
// ґଘπϦʔΛߏங
startKoin(this, listOf(appModule, apiModule))
}
}
͜͜ΦʔόʔϥΠυ
Ͱ͖ΔΑ͏ʹ͢Δ
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class TestApp : App() {
override val apiModule = module {
factory {
val user = User(123, “kobakei”)
val apiClient = mockk {
every { getUser(any()) } returns Single.just(user)
}
apiClient
}
}
}
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class TestApp : App() {
override val apiModule = module {
factory {
val user = User(123, “kobakei”)
val apiClient = mockk {
every { getUser(any()) } returns Single.just(user)
}
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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ຊͷ·ͱΊ
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·ͱΊ
• DI = ίϯϙʔωϯτؒͷґଘؔΛ֎෦ʹ͍ग़͢σβΠϯύ
λʔϯ
• DIΛಋೖ͢Δ͜ͱͰɺίϯϙʔωϯτ͕ૄ݁߹ʹͳΓɺίϯ
ϙʔωϯτΛࠩ͠ସ͑ͨΓɺςετ͕ॻ͖͘͢ͳΔ
• Dagger2KoinͳͲDIίϯςφΛར༻͠Α͏
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Thanks!!!