안드로이드 DI 어떻게 하나요?

2019년 12월 21일 GDG Android Dev Summit 2019 Extended 행사에서 발표한 자료입니다.
행사: https://festa.io/events/744
샘플코드: https://github.com/maryangmin/GDG-Dagger

Koin과 Dagger 중에 무엇이 좋나요? 그전에 DI를 왜 해야 하나요? 아니 DI는 뭔가요?
DI의 기본부터, 안드로이드에서 어떻게 적용하면 좋을지, Dagger2 중심으로 Android Dev Summit에서 나온 가이드를 소개합니다.

Transcript

1. Android Dev Summit 2019 extended Seoul উ٘۽੉٘ DI যڌѱ ೞաਃ? ੉थ޹ ߛ௼࢟۞٘
2. ߊ಴ ݾ಴ Koinҗ Dagger ઺ী ޖ঺੉ જաਃ? ৵ DIܳ ೧ঠ ೞաਃ? DIח ޥоਃ? DI੄ ӝࠄࠗఠ Androidীࢲ যڌѱ ੸ਊೞݶ જਸ૑, Android Dev Summitীࢲ աৡ о੉٘ܳ ࣗѐ೤פ׮.
3. ݾର 1. DIח ޥоਃ? 2. DIో ޖ঺੉ જաਃ? 3. Dagger рױ ࢎਊߨ 4. Improving Dagger 5. Ѿۿ
4. Android Dev Summit 2019 extended Seoul DIח ޥоਃ?
5. DI? Dependency Injection
6. Dependency - ੄ઓࢿ? Aח Bী ੄ઓ A class B class
7. ੄ઓࢿ ࢤࢿ? new۽ ࢤࢿ A class B class new
8. ੄ઓࢿ ઱ੑ? ࢤࢿػ ੄ઓࢿ ё୓ܳ ੹׳߉਺ A class new A class B class
9. class Car { private val engine: Engine }
10. class Car { private val engine: Engine } ੄ઓࢿ
11. class Car { private val engine: Engine = Engine() }
12. class Car { private val engine: Engine = Engine() } ੄ઓࢿ ࢤࢿ
13. class Car( private val engine: Engine ) ੄ઓࢿ ઱ੑ Constructor Parameter
14. Why DI? 1. ए਍ ܻಖష݂
15. class Car { // Very Long Code } ए਍ ܻಖష݂
16. class Car( private val engine: Engine, private val battery: Battery, private val handle: Handle, private val padel: Padel, private val brake: Brake, private val radiator: Radiator ) { // Short Code } ए਍ ܻಖష݂
17. class Car( private val engine: Engine, private val battery: Battery, private val handle: Handle, private val padel: Padel, private val brake: Brake, private val radiator: Radiator ) { // Short Code } ए਍ ܻಖష݂ Smaller-focused. ৉ೡਸ ա־঻׮. Loosed Coupling
18. Why DI? 1. ए਍ ܻಖష݂ 2. ੤ࢎਊࢿ
19. val eletricCar = Car(EletricEngine()) val gasolinCar = Car(GasolinEngine()) ੤ࢎਊࢿ
20. val eletricCar = Car(EletricEngine()) val gasolinCar = Car(GasolinEngine()) ੤ࢎਊࢿ Car ੤ഝਊ
21. val eletricCar = Car(EletricEngine()) val gasolinCar = Car(GasolinEngine()) ੤ࢎਊࢿ ա־য૓ ৉ೡਸ औѱ Ү୓ Loosed Coupling
22. Why DI? 1. ए਍ ܻಖష݂ 2. ੤ࢎਊࢿ 3. ए਍ పझ౟
23. class CarTest { @Test fun carTest() { Car(FakeEngine()) } @Test fun carTest_fail() { Car(FakeFailEngine()) } } ए਍ పझ౟ ੄ઓࢿ Ү୓
24. class CarTest { @Test fun carTest() { Car(FakeEngine()) } @Test fun carTest_fail() { Car(FakeFailEngine()) } } ए਍ పझ౟ ੄ઓࢿ Ү୓ Loosed Copuling
25. Why DI? 1. ए਍ ܻಖష݂ 2. ੤ࢎਊࢿ 3. ए਍ పझ౟ Loosed Coupling !
26. Android Dev Summit 2019 extended Seoul DIో ޖ঺੉ જաਃ?
27. DI ߑߨ Manual DI Koin Dagger
28. Manual DI ѐߊ੗о ૒੽ ё୓ ࢤࢿ
29. Manual DI Activity/Fragmentীࢲ ё୓ࢤࢿ ౵ۄ޷ఠ ࠁੌ۞೒ۨ੉౟ ѐߊ੗о ૒੽ ё୓ ࢤࢿ
30. Koin Service Locator
31. Koin Service Locator Runtime ఋੑ ୓௼
32. Dagger Generated Code Compile Time ఋੑ ୓௼
33. Dagger Generated Code Compile Time ఋੑ ୓௼ ֫਷ ೟ण࠺ਊ
34. DIో ޖ঺੉ જաਃ? Manual DI Koin Dagger
35. Google੄ ࢶఖ਷…
36. Google੄ ࢶఖ਷…
37. ߛ௼࢟۞٘੄ ࢶఖ਷…
38. Let’s Dagger!
39. Android Dev Summit 2019 extended Seoul Dagger рױ ࢎਊߨ
40. Module Bind / Provide Component Dagger ҳࢿ
41. Module Bind / Provide Component Dagger ҳࢿ ੄ઓࢿ ࢤࢿ Class ੄ઓࢿ ࢤࢿ Method Module प೯
42. AndroidInjector ੉ਊೞӝ Google Guide ٮܰӝ Dagger ࢎਊߨ
43. AndroidInjector ੉ਊೞӝ @Component(modules = [ AndroidSupportInjectionModule::class, ActivityBindingModule::class ]) interface AppComponent : AndroidInjector<BaseApplication> { @Component.Builder interface Builder { fun build(): AppComponent } } AppComponent ࢶ঱
44. AndroidInjector ੉ਊೞӝ @Component(modules = [ AndroidSupportInjectionModule::class, ActivityBindingModule::class ]) interface AppComponent : AndroidInjector<BaseApplication> { @Component.Builder interface Builder { fun build(): AppComponent } }
45. AndroidInjector ੉ਊೞӝ @Module abstract class ActivityBindingModule { @ContributesAndroidInjector(modules = [MainActivityModule::class]) abstract fun mainActivity(): MainActivity } ActivitySubComponent ࢶ঱ Module োѾ
46. AndroidInjector ੉ਊೞӝ @Module abstract class MainActivityModule { @Binds abstract fun mainView(activity: MainActivity): MainView } Module ࢶ঱ ੄ઓࢿ ࢤࢿ
47. AndroidInjector ੉ਊೞӝ class BaseApplication : DaggerApplication() { fun applicationInjector(): AndroidInjector<out DaggerApplication> { return DaggerAppComponent.builder().application(this).build() } } class BaseActivity : DaggerActivity() class BaseFragment : DaggerFragment() Component ࢤࢿ DaggerApplication/Activity/Fragment ীࢲ Inject
48. Google Guide ٮܰӝ @Component interface AppComponent { fun mainActivity(module: MainActivityModule): MainActivityComponent } @Subcomponent(modules = [MainActivityModule::class]) interface MainActivityComponent { fun inject(activity: MainActivity) } AppComponent / ActivitySubComponent ࢶ঱
49. Google Guide ٮܰӝ @Module class MainActivityModule( private val activity: MainActivity ) { @Provides fun mainActivity(): MainActivity = activity @Provides fun mainView(activity: MainActivity): MainView = activity } Module ࢶ঱ ੄ઓࢿ ࢤࢿ
50. Google Guide ٮܰӝ class MainActivity { @Inject lateinit var presenter: MainPresenter fun onCreate() { DaggerAppComponent.create() .mainActivity(MainActivityModule(this)) .inject(this) } } Component ࢤࢿ Module োѾ Inject
51. AppComponent ࢶ঱ ActivitySubComponent ࢶ঱ Module ࢶ঱ ੄ઓࢿ ࢤࢿ Component ࢤࢿ Module োѾ Inject Dagger ൒ܴ
52. AndroidInjector ੉ਊೞӝ Google Guide ٮܰӝ Dagger ࢎਊߨ ୶ୌ
53. AndroidInjector ੉ਊೞӝ Google Guide ٮܰӝ Dagger ࢎਊߨ ୶ୌ ই૒਷ AndroidInjectorо উ٘۽੉٘ ҳઑী ಞೞ׮ SubComponent ҙܻо ಞೞ׮
54. Android Dev Summit 2019 extended Seoul Improving Dagger
55. Dagger support Kotlin
56. Dagger + Kotlin = ❤ @Module annotation support object class
57. @Module object DatabaseModule { @Provides @JvmStatic fun provideDB(context: Context): AppDatabase { // ... } } Dagger + Kotlin = ❤ @Module annotation support object class
58. Dagger + Kotlin = ❤ @Module annotation support object class @Module object DatabaseModule { @Provides fun provideDB(context: Context): AppDatabase { // ... } } @JvmStatic ࢏ઁ
59. Dagger + Kotlin = ❤ Support kotlin wildcards
60. Dagger + Kotlin = ❤ Support kotlin wildcards @Module class ConfigurationModule { @Provides fun provideConfigs(): List<@JvmSuppressWildcards String> { // ... } }
61. Dagger + Kotlin = ❤ Support kotlin wildcards @Module class ConfigurationModule { @Provides fun provideConfigs(): List<String> { // ... } } @JvmSuppressWildcards ࢏ઁ
62. Simple Dagger in Android
63. Module Bind / Provide Component Dagger ҳࢿ
64. Bind / Provide @Module abstract class MainActivityModule { @ActivityScope @Binds abstract fun mainView(activity: MainActivity): MainView }
65. Bind / Provide @Module abstract class MainActivityModule { @ActivityScope @Binds abstract fun mainView(activity: MainActivity): MainView } Something Specific Cannot be Simple
66. Focus on Bindings Taking the responsibility of module discovery and component definition
67. Module Discovery class MainActivity { @Inject lateinit var presenter: MainPresenter fun onCreate() { (applicationContext as BaseApplication).appComponent .mainActivity(MainActivityModule(this)) .inject(this) } } Module Discovery Inject
68. Module Discovery @EntryPoint class MainActivity { @Inject lateinit var presenter: MainPresenter } Module Discovery ࢏ઁ ੗ز Inject
69. Predefined Component @Subcomponent(modules = [MainActivityModule::class]) interface MainActivityComponent { fun inject(activity: MainActivity) } Component ࢶ঱
70. Predefined Component @Module @InstallIn(ActivityComponent::class) class MainActivityModule( private val activity: MainActivity ) { @Provides fun mainActivity(): MainActivity = activity @Provides fun mainView(activity: MainActivity): MainView = activity } @InstallInਵ۽ Component োѾ
71. Predefined Component @Module @InstallIn(AppComponent::class) class MainActivityModule( private val activity: MainActivity ) { @Provides fun mainActivity(): MainActivity = activity @Provides fun mainView(activity: MainActivity): MainView = activity }
72. Predefined Component @Module @InstallIn(ServiceComponent::class) class MainActivityModule( private val activity: MainActivity ) { @Provides fun mainActivity(): MainActivity = activity @Provides fun mainView(activity: MainActivity): MainView = activity }
73. Predefined Component @Module @InstallIn(SingletonComponent::class) class MainActivityModule( private val activity: MainActivity ) { @Provides fun mainActivity(): MainActivity = activity @Provides fun mainView(activity: MainActivity): MainView = activity } ޷ܻ ٜ݅য૓ Component ഝਊ Component ࢶ঱ ࢏ઁ
74. Predefined Components SingletonComponent ActivityComponent FragmentComponent ServiceComponent
75. Testing
76. InstrumentTest Module Discovery @RunWith(AndroidJUnit4::class) class MainActivityTest { @Inject lateinit var car: Car val mainActivity: MainActivity } যڌѱ Inject?
77. @RunWith(AndroidJUnit4::class) class MainActivityTest { @Rule val testEntryPoint = TestEntryPointRule() @Inject lateinit var car: Car } InstrumentTest Module Discovery TestEntryPointRule ੗ز Inject
78. @RunWith(AndroidJUnit4::class) class MainActivityTest { @Rule val testEntryPoint = TestEntryPointRule() @Inject lateinit var car: Car @TestModule object CarTestModule { @Provides fun provideFakeCar() = Car(FakeEngine()) } } Test only Module
79. Google Improving Dagger Dagger support Kotlin Simple Dagger in Android Testing Utility
80. Android Dev Summit 2019 extended Seoul Ѿۿ
81. ੄ઓࢿ ઱ੑ? ࢤࢿػ ੄ઓࢿ ё୓ܳ ੹׳߉਺ A class new A class B class
82. Why DI? 1. ए਍ ܻಖష݂ 2. ੤ࢎਊࢿ 3. ए਍ పझ౟ Loosed Coupling !
83. DI ߑߨ Manual DI Koin Dagger
84. Google੄ ࢶఖ਷…
85. Module Bind / Provide Component Dagger ҳࢿ ੄ઓࢿ ࢤࢿ Class ੄ઓࢿ ࢤࢿ Method Module प೯
86. AndroidInjector ੉ਊೞӝ Google Guide ٮܰӝ Dagger ࢎਊߨ ୶ୌ ই૒਷ AndroidInjectorо উ٘۽੉٘ ҳઑী ಞೞ׮ SubComponent ҙܻо ಞೞ׮
87. Google Improving Dagger Dagger support Kotlin Simple Dagger in Android Testing Utility
88. Let’s Dagger!
89. ߛ௼࢟۞٘ Applying Dagger %BHHFS
    ੸ਊ઺ੋ
    ߛ௼䣓۞٘
    উ٘۽੉٘
    ѐߊ੗
    ݽ૘
90. Reference https://developer.android.com/training/dependency-injection https://youtu.be/o-ins1nvbDg https://github.com/maryangmin/GDG-Dagger
91. Android Dev Summit 2019 extended Seoul хࢎ೤פ׮ ੉थ޹ ߛ௼࢟۞٘