Dagger 2 Android : Defeat the Dahaka

Presentation for Droidcon Berlin, 2017.

Github Demo : https://github.com/ragdroid/Dahaka
Medium Blogs : https://proandroiddev.com/dagger-2-android-defeat-the-dahaka-b1c542233efc

Transcript

1. “Defeat the Dahaka" Dagger 2 Android Garima Jain @ragdroid
2. Garima Jain @ragdroid
3. Garima Jain @ragdroid
4. Garima Jain @ragdroid
5. Garima Jain @ragdroid
6. Garima Jain @ragdroid
7. Garima Jain @ragdroid
8. @ragdroid @droidconDE
9. @ragdroid @droidconDE MVP Testing DataBinding Retrofit Dagger 2
10. Garima Jain @ragdroid “Defeat the Dahaka" Dagger 2 Android
11. @ragdroid @droidconDE POP QUIZ • Dagger2? • Dagger Android • Prince of Persia
12. ABOUT THE TALK
13. Theme: Prince of Persia • Prince uses Dagger • Dagger can reverse time • Dahaka, (guardian of timeline) • Dahaka comes to kill the Prince.
14. Analogy • Prince = Us • Dagger = Dagger • Dahaka (Enemy) = Generated Code, Complexity
15. Analogy • Developer uses Dagger • Developer starts backtracking the generated code • Developer is chased by the Dahaka (complexity of generated code)
16. Agenda • Brief Introduction - “Codes of Time” • Scopes - “Face of the Dahaka” • @Singleton Scopes • @Reusable Scopes • Custom Scopes • Component Dependencies - “Unleash the Beast” • Demo App • Dependent Component • Subcomponent • Intermediate Concepts - “Defeat the Dahaka” • Dagger Android - “Befriend the Beast”
17. Who? • Assumption : Basic familiarity with Dagger • Intermediate
18. INTRODUCTION “CODES OF TIME”
19. @ragdroid @droidconDE Droid of Asia
20. @ragdroid @droidconDE public UserManager() {
 this.service = new PokemonService(); 
 } Droid of Asia
21. @ragdroid @droidconDE Dependency Creation Disadvantages • Non-Testable • Non-Extendable
22. @ragdroid @droidconDE Dagger 1
23. @ragdroid @droidconDE Dagger 1 Advantages • Testable code • Modularized
24. @ragdroid @droidconDE Dagger 1 Disadvantages • Reflection • Runtime Graph Composition • God Module with @Singleton • Difficult to use proguard
25. @ragdroid @droidconDE Dagger 1 Disadvantages Dagger 2
26. @ragdroid @droidconDE Dagger 2 Advantages • No Reflection • Compile-time Graph Composition • Traceable code • Better Scope management
27. SCOPES “FACE OF THE DAHAKA”
28. Scope • Annotation from javax.inject package • How long a scoped instance lives • What happens if : • No Scope specified? • Annotation is specified?
29. @Singleton • Another annotation from javax.inject package • Scope of dependency is throughout the application • Two ways to re-use dependencies : • Annotate Provider methods • Annotate the Dependency class itself
30. @ragdroid @droidconDE @SINGLETON EXAMPLE
31. AppComponent @Component(modules = AppModule.class) @Singleton public interface AppComponent { Application application(); }
32. AppComponent @Component(modules = AppModule.class) @Singleton public interface AppComponent { Application application(); } AppComponent
33. @ragdroid @droidconDE CASE 1 DEPENDENCY W/O SCOPE
34. AppModule @Module public class AppModule { private final Application application; public AppModule(Application application) { this.application = application; } @Provides //No @Singleton annotation Application applicationProvider() { return application; } }
35. @Module public class AppModule { private final Application application; public AppModule(Application application) { this.application = application; } @Provides //No @Singleton annotation Application applicationProvider() { return application; } } AppModule
36. DaggerAppComponent @Generated public final class DaggerAppComponent implements AppComponent { private Provider<Application> applicationProvider; /** other code **/ private void initialize(final Builder builder) { this.applicationProvider = AppModule_ApplicationFactory.create(builder.appModule); } } (Generated)
37. DaggerAppComponent @Generated public final class DaggerAppComponent implements AppComponent { private Provider<Application> applicationProvider; /** other code **/ private void initialize(final Builder builder) { this.applicationProvider = AppModule_ApplicationFactory.create(builder.appModule); } } (Generated)
38. DaggerAppComponent @Generated public final class DaggerAppComponent implements AppComponent { private Provider<Application> applicationProvider; /** other code **/ private void initialize(final Builder builder) { this.applicationProvider = AppModule_ApplicationFactory.create(builder.appModule); } } (Generated)
39. @ragdroid @droidconDE CASE 2 DEPENDENCY WITH SCOPE
40. AppModule @Module public class AppModule { private final Application application; public AppModule(Application application) { this.application = application; } @Provides @Singleton Application applicationProvider() { return application; } }
41. AppModule @Module public class AppModule { private final Application application; public AppModule(Application application) { this.application = application; } @Provides @Singleton Application applicationProvider() { return application; } }
42. DaggerAppComponent @Generated public final class DaggerAppComponent implements AppComponent { private Provider<Application> applicationProvider; /** other code **/ private void initialize(final Builder builder) { this.applicationProvider = DoubleCheck.provider( AppModule_ApplicationFactory.create(builder.appModule)); } } (Generated)
43. DaggerAppComponent @Generated public final class DaggerAppComponent implements AppComponent { private Provider<Application> applicationProvider; /** other code **/ private void initialize(final Builder builder) { this.applicationProvider = DoubleCheck.provider( AppModule_ApplicationFactory.create(builder.appModule)); } } (Generated)
44. DaggerAppComponent @Generated public final class DaggerAppComponent implements AppComponent { private Provider<Application> applicationProvider; /** other code **/ private void initialize(final Builder builder) { this.applicationProvider = DoubleCheck.provider( AppModule_ApplicationFactory.create(builder.appModule)); } } (Generated)
45. DaggerAppComponent @Generated public final class DaggerAppComponent implements AppComponent { private Provider<Application> applicationProvider; /** other code **/ private void initialize(final Builder builder) { this.applicationProvider = DoubleCheck.provider( AppModule_ApplicationFactory.create(builder.appModule)); } } (Generated)
46. DoubleCheck Memoizes value using Double-Check idiom. (dagger.internal)
47. DoubleCheck Memoizes value using Double-Check idiom. public T get() {
 Object result = instance;
 if (result == UNINITIALIZED) {
 synchronized (this) {
 result = instance;
 if (result == UNINITIALIZED) {
 result = provider.get();
 
 Object currentInstance = instance; // other code
 instance = result;
 
 provider = null;
 }
 }
 }
 return (T) result;
 } (dagger.internal)
48. DoubleCheck Memoizes value using Double-Check idiom. public T get() {
 Object result = instance;
 if (result == UNINITIALIZED) {
 synchronized (this) {
 result = instance;
 if (result == UNINITIALIZED) {
 result = provider.get();
 
 Object currentInstance = instance; // other code
 instance = result;
 
 provider = null;
 }
 }
 }
 return (T) result;
 } (dagger.internal)
49. DoubleCheck Memoizes value using Double-Check idiom. public T get() {
 Object result = instance;
 if (result == UNINITIALIZED) {
 synchronized (this) {
 result = instance;
 if (result == UNINITIALIZED) {
 result = provider.get();
 
 Object currentInstance = instance; // other code
 instance = result;
 
 provider = null;
 }
 }
 }
 return (T) result;
 } (dagger.internal)
50. Take Aways • DONT “Scope All the Things!” • Scoping has overheads. • By-default no Scope. • Scope only when needed • Like for Heavy Mutable Objects
51. @ragdroid @droidconDE @REUSABLE
52. @Reusable • Limit the instantiation. • Use when Exact same instance not needed. • Not tied to any component or subcomponent. • Can Have multiple sub-components caching different instances. • Use for heavy immutable dependencies.
53. ReusableComponent 
 @Component(modules = ReusableModule.class) public interface ReusableComponent { SomeObject someObject(); }
54. ReusableComponent 
 @Component(modules = ReusableModule.class) public interface ReusableComponent { SomeObject someObject(); }
55. SomeObject @Reusable public class SomeObject { @Inject public SomeObject() { } }
56. DaggerReusableComponent @Generated public final class DaggerReusableComponent implements ReusableComponent { /** other code **/ Provider<SomeObject> someObjectProvider; private void initialize(final Builder builder) { this.someObjectProvider = SingleCheck.provider(SomeObject_Factory.create()); } } (Generated)
57. DaggerReusableComponent @Generated public final class DaggerReusableComponent implements ReusableComponent { /** other code **/ Provider<SomeObject> someObjectProvider; private void initialize(final Builder builder) { this.someObjectProvider = SingleCheck.provider(SomeObject_Factory.create()); } } (Generated)
58. DaggerReusableComponent @Generated public final class DaggerReusableComponent implements ReusableComponent { /** other code **/ Provider<SomeObject> someObjectProvider; private void initialize(final Builder builder) { this.someObjectProvider = SingleCheck.provider(SomeObject_Factory.create()); } } (Generated)
59. SingleCheck Memoizes value using simple lazy initialization and caching (dagger.internal)
60. Memoizes value using simple lazy initialization and caching public T get() {
 
 Provider<T> providerReference = provider;
 if (instance == UNINITIALIZED) {
 instance = providerReference.get();
 provider = null;
 }
 return (T) instance;
 } (dagger.internal) SingleCheck
61. Memoizes value using simple lazy initialization public T get() {
 
 Provider<T> providerReference = provider;
 if (instance == UNINITIALIZED) {
 instance = providerReference.get();
 provider = null;
 }
 return (T) instance;
 } (dagger.internal) SingleCheck
62. @Singleton vs @Reusable • Heavy mutable object : @Singleton • Heavy immutable object : @Reusable •
63. @ragdroid @droidconDE GOD APP MODULE
64. @ragdroid @droidconDE App Module AppComponent @Module public class AppModule { private final Application application; @Provides @Si AppModule @Singleton @Component(modules = AppModule.class) @Singleton public interface AppComponent { Application application(); }
65. @ragdroid @droidconDE Big App Module AppComponent @Module public class AppModule { private final Application application; @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton AppModule @Singleton @Component(modules = AppModule.class) @Singleton public interface AppComponent { Application application(); }
66. @ragdroid @droidconDE AppComponent @Module public class AppModule { private final Application application; @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } } AppModule @Singleton Big App Module @Component(modules = AppModule.class) @Singleton public interface AppComponent { Application application(); }
67. @ragdroid @droidconDE AppComponent @Module public class AppModule { private final Application application; @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } } AppModule @Singleton God Module God App Module @Component(modules = AppModule.class) @Singleton public interface AppComponent { Application application(); }
68. @ragdroid @droidconDE God App Module How To Improve?
69. @ragdroid @droidconDE God App Module Splitting App Module
70. @ragdroid @droidconDE AppComponent @Module public class AppModule { private final Application application; @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } } @Singleton @Component(modules = AppModule.class) @Singleton public interface AppComponent { Application application(); } Splitting App Module ApiModule AppModule
71. @ragdroid @droidconDE Splitting App Module @Module public class AppModule { private final Application application; @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } } AppModule ApiModule AppComponent @Singleton @Component(modules = AppModule.class) @Singleton public interface AppComponent { Application application(); }
72. @ragdroid @droidconDE Splitting App Module AppComponent @Module public class AppModule { private final Application application; @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } } AppModule @Singleton @Component(modules = AppModule.class) @Singleton public interface AppComponent { Application application(); } ApiModule @Component( modules = AppModule.class, ApiModule.class)
73. @ragdroid @droidconDE Splitting App Module @Module public class AppModule { private final Application application; @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } } AppModule ApiModule @Component( modules = AppModule.class, ApiModule.class) OR AppComponent
74. @ragdroid @droidconDE Splitting App Module @Module public class AppModule { private final Application application; @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } @Provides @Singleton Application applicationProvider() { return application; } } AppModule ApiModule @Component( modules = AppModule.class, ApiModule.class) @Module( includes = ApiModule.class) AppModule OR AppComponent
75. @ragdroid @droidconDE Splitting App Module
76. @ragdroid @droidconDE How to Improve? • Better Scope Management • More modularity • Custom Scopes : • @UserScope • @ActivityScope • @FragmentScope
77. @ragdroid @droidconDE Custom Scopes
78. @ragdroid @droidconDE Custom Scopes Multiple Components
79. Multiple Components 1. Dependent Components 2. Sub-Components
80. COMPONENT DEPENDENCIES
81. @ragdroid @droidconDE POKEMON APP
82. AppComponent (@Singleton) UserComponent (@UserScope) UserComponent @UserScope Login Component @ActivityScope Home Component Items Component Login Component Home Component Items Component Fragments Fragments Application
83. AppComponent (@Singleton) UserComponent (@UserScope) UserComponent @UserScope Login Component @ActivityScope Home Component Items Component Login Component Home Component Items Component Fragments Fragments Launch Application
84. AppComponent (@Singleton) UserComponent (@UserScope) UserComponent @UserScope Login Component @ActivityScope Home Component Items Component Login Component Home Component Items Component Fragments Fragments Launch pikachu Login Application
85. AppComponent (@Singleton) UserComponent (@UserScope) UserComponent @UserScope Login Component @ActivityScope Home Component Items Component Login Component Home Component Items Component Fragments Fragments Launch pikachu Login Inventory Application
86. AppComponent (@Singleton) UserComponent (@UserScope) UserComponent @UserScope Login Component @ActivityScope Home Component Items Component Login Component Home Component Items Component Fragments Fragments Launch pikachu Login Log-Out Inventory Application
87. AppComponent (@Singleton) UserComponent (@UserScope) UserComponent @UserScope Login Component @ActivityScope Home Component Items Component Login Component Home Component Items Component Fragments Fragments Launch pikachu Login Log-Out jigglypuff Inventory Application
88. AppComponent (@Singleton) UserComponent (@UserScope) UserComponent @UserScope Login Component @ActivityScope Home Component Items Component Login Component Home Component Items Component Fragments Fragments Launch pikachu Login Log-Out jigglypuff Inventory Inventory Application
89. Pokemon App
90. @ragdroid @droidconDE SUB COMPONENT VS DEPENDENT COMPONENT
91. <<interface>> AppComponent schedulerProvider @Singleton
92. AppComponentImpl • schedulerProvider() : @Singleton • userManager : @Singleton LoginComponentImpl <<interface>> AppComponent schedulerProvider Sub Component @Singleton @ActivityScope
93. UserComponentImpl • schedulerProvider • pokemon AppComponentImpl • schedulerProvider() : @Singleton • userManager : @Singleton LoginComponentImpl <<interface>> AppComponent schedulerProvider HomeComponentImpl ItemsComponentImpl Dependent Component Sub Component @Singleton @ActivityScope @UserScope @ActivityScope @ActivityScope
94. UserComponentImpl • schedulerProvider • pokemon AppComponentImpl • schedulerProvider() : @Singleton • userManager : @Singleton LoginComponentImpl <<interface>> AppComponent schedulerProvider HomeComponentImpl ItemsComponentImpl Dependent Component Sub Component @Singleton @ActivityScope @UserScope @ActivityScope @ActivityScope
95. @ragdroid @droidconDE APP COMPONENT
96. @Singleton @Component(modules = arrayOf(AppModule::class, ApiModule::class)) interface AppComponent { fun loginBuilder(): LoginComponent.Builder fun schedulerProvider(): BaseSchedulerProvider } AppComponent
97. @Singleton @Component(modules = arrayOf(AppModule::class, ApiModule::class)) interface AppComponent { fun loginBuilder(): LoginComponent.Builder fun schedulerProvider(): BaseSchedulerProvider } AppComponent
98. @Singleton @Component(modules = arrayOf(AppModule::class, ApiModule::class)) interface AppComponent { fun loginBuilder(): LoginComponent.Builder fun schedulerProvider(): BaseSchedulerProvider } AppComponent
99. @ragdroid @droidconDE DAHAKA APPLICATION
100. class DahakaApplication : Application() { override fun onCreate() { super.onCreate() appComponent = DaggerAppComponent .builder() .application(this) .build() } } DahakaApplication
101. class DahakaApplication : Application() { override fun onCreate() { super.onCreate() appComponent = DaggerAppComponent .builder() .application(this) .build() } } DahakaApplication
102. DEPENDENT COMPONENTS
103. @ragdroid @droidconDE USER COMPONENT
104. @Component(dependencies = arrayOf(AppComponent::class), modules = arrayOf(UserModule::class)) @UserScope interface UserComponent { @Component.Builder interface Builder { @BindsInstance fun pokeMon(pokemon: Pokemon): Builder … } } UserComponent
105. @Component(dependencies = arrayOf(AppComponent::class), modules = arrayOf(UserModule::class)) @UserScope interface UserComponent { @Component.Builder interface Builder { @BindsInstance fun pokeMon(pokemon: Pokemon): Builder … } } UserComponent
106. @Component(dependencies = arrayOf(AppComponent::class), modules = arrayOf(UserModule::class)) @UserScope interface UserComponent { @Component.Builder interface Builder { @BindsInstance fun pokeMon(pokemon: Pokemon): Builder … } } UserComponent
107. Binding Pokemon • Two ways of Providing / Binding Pokemon to graph 1. UserModule Constructor 2. @Component.Builder with @BindsInstance
108. 
 @Module
 public abstract class UserModule {
 
 private final Pokemon pokemon;
 
 public UserModule(Pokemon pokemon) {
 this.pokemon = pokemon;
 }
 
 @Provides
 @UserScope
 public Pokemon providePokemon() {
 return pokemon;
 }
 
 }
 UserModule Constructor
109. 
 @Module
 public abstract class UserModule {
 
 private final Pokemon pokemon;
 
 public UserModule(Pokemon pokemon) {
 this.pokemon = pokemon;
 }
 
 @Provides
 @UserScope
 public Pokemon providePokemon() {
 return pokemon;
 }
 
 }
 UserModule Constructor
110. 
 @Module
 public abstract class UserModule {
 
 private final Pokemon pokemon;
 
 public UserModule(Pokemon pokemon) {
 this.pokemon = pokemon;
 }
 
 @Provides
 @UserScope
 public Pokemon providePokemon() {
 return pokemon;
 }
 
 }
 UserModule Constructor
111. @Component(dependencies = arrayOf(AppComponent::class), modules = arrayOf(UserModule::class)) @UserScope interface UserComponent { @Component.Builder interface Builder { @BindsInstance fun pokeMon(pokemon: Pokemon): Builder … } } User Component @Component.Builder
112. @Component(dependencies = arrayOf(AppComponent::class), modules = arrayOf(UserModule::class)) @UserScope interface UserComponent { @Component.Builder interface Builder { @BindsInstance fun pokeMon(pokemon: Pokemon): Builder … } } UserComponent @BindsInstance
113. @ragdroid @droidconDE USER MANAGER
114. @Singleton class UserManager @Inject constructor(private val service: PokemonService) { var userComponent: UserComponent? = null private set public fun createUserSession(pokemon: Pokemon) { userComponent = DaggerUserComponent.builder() .appComponent(DahakaApplication.app.appComponent) .pokeMon(pokemon) .build() } … } UserManager
115. @Singleton class UserManager @Inject constructor(private val service: PokemonService) { var userComponent: UserComponent? = null private set public fun createUserSession(pokemon: Pokemon) { userComponent = DaggerUserComponent.builder() .appComponent(DahakaApplication.app.appComponent) .pokeMon(pokemon) .build() } … } UserManager
116. @Singleton class UserManager @Inject constructor(private val service: PokemonService) { var userComponent: UserComponent? = null private set public fun createUserSession(pokemon: Pokemon) { userComponent = DaggerUserComponent.builder() .appComponent(DahakaApplication.app.appComponent) .pokeMon(pokemon) .build() } … } UserManager
117. @ragdroid @droidconDE DAGGER USER COMPONENT (Generated)
118. public final class DaggerUserComponent implements UserComponent { private Provider<BaseSchedulerProvider> schedulerProvider; private void initialize(final Builder builder) { this.schedulerProvider = new AppComponent_schedulerProvider(builder.appComponent); … } private static class AppComponent_schedulerProvider implements Provider<BaseSchedulerProvider> { private final AppComponent appComponent; @Override public BaseSchedulerProvider get() { return appComponent.schedulerProvider(); } … } } DaggerUserComponent (Generated)
119. public final class DaggerUserComponent implements UserComponent { private Provider<BaseSchedulerProvider> schedulerProvider; private void initialize(final Builder builder) { this.schedulerProvider = new AppComponent_schedulerProvider(builder.appComponent); … } private static class AppComponent_schedulerProvider implements Provider<BaseSchedulerProvider> { private final AppComponent appComponent; @Override public BaseSchedulerProvider get() { return appComponent.schedulerProvider(); } … } } DaggerUserComponent (Generated)
120. public final class DaggerUserComponent implements UserComponent { private Provider<BaseSchedulerProvider> schedulerProvider; private void initialize(final Builder builder) { this.schedulerProvider = new AppComponent_schedulerProvider(builder.appComponent); … } private static class AppComponent_schedulerProvider implements Provider<BaseSchedulerProvider> { private final AppComponent appComponent; @Override public BaseSchedulerProvider get() { return appComponent.schedulerProvider(); } … } } DaggerUserComponent (Generated)
121. public final class DaggerUserComponent implements UserComponent { private Provider<BaseSchedulerProvider> schedulerProvider; private void initialize(final Builder builder) { this.schedulerProvider = new AppComponent_schedulerProvider(builder.appComponent); … } private static class AppComponent_schedulerProvider implements Provider<BaseSchedulerProvider> { private final AppComponent appComponent; @Override public BaseSchedulerProvider get() { return appComponent.schedulerProvider(); } … } } DaggerUserComponent (Generated)
122. public final class DaggerUserComponent implements UserComponent { private Provider<BaseSchedulerProvider> schedulerProvider; private void initialize(final Builder builder) { this.schedulerProvider = new AppComponent_schedulerProvider(builder.appComponent); … } private static class AppComponent_schedulerProvider implements Provider<BaseSchedulerProvider> { private final AppComponent appComponent; @Override public BaseSchedulerProvider get() { return appComponent.schedulerProvider(); } … } } DaggerUserComponent (Generated)
123. public final class DaggerUserComponent implements UserComponent { private Provider<BaseSchedulerProvider> schedulerProvider; private void initialize(final Builder builder) { this.schedulerProvider = new AppComponent_schedulerProvider(builder.appComponent); … } private static class AppComponent_schedulerProvider implements Provider<BaseSchedulerProvider> { private final AppComponent appComponent; @Override public BaseSchedulerProvider get() { return appComponent.schedulerProvider(); } … } } DaggerUserComponent (Generated)
124. SUB COMPONENTS
125. @ragdroid @droidconDE LOGIN SUBCOMPONENT
126. @ActivityScope @Subcomponent(modules = arrayOf(LoginModule::class)) interface LoginComponent { @Subcomponent.Builder interface Builder { @BindsInstance fun loginActivity(loginActivity: LoginActivity): Builder } } LoginComponent
127. @ActivityScope @Subcomponent(modules = arrayOf(LoginModule::class)) interface LoginComponent { @Subcomponent.Builder interface Builder { @BindsInstance fun loginActivity(loginActivity: LoginActivity): Builder } } LoginComponent
128. @ActivityScope @Subcomponent(modules = arrayOf(LoginModule::class)) interface LoginComponent { @Subcomponent.Builder interface Builder { @BindsInstance fun loginActivity(loginActivity: LoginActivity): Builder } } LoginComponent
129. @ActivityScope @Subcomponent(modules = arrayOf(LoginModule::class)) interface LoginComponent { @Subcomponent.Builder interface Builder { @BindsInstance fun loginActivity(loginActivity: LoginActivity): Builder } } LoginComponent
130. @ActivityScope @Subcomponent(modules = arrayOf(LoginModule::class)) interface LoginComponent { @Subcomponent.Builder interface Builder { @BindsInstance fun loginActivity(loginActivity: LoginActivity): Builder } } LoginComponent
131. @ragdroid @droidconDE LOGIN ACTIVITY
132. class LoginActivity { private lateinit var loginComponent: LoginComponent override fun initDagger(appComponent: AppComponent) { loginComponent = appComponent .loginBuilder() .loginActivity(this) .build() } … } LoginActivity
133. class LoginActivity { private lateinit var loginComponent: LoginComponent override fun initDagger(appComponent: AppComponent) { loginComponent = appComponent .loginBuilder() .loginActivity(this) .build() } … } LoginActivity
134. @ragdroid @droidconDE DAGGER APP COMPONENT (Generated)
135. public final class DaggerAppComponent implements AppComponent { this.loginBuilderProvider = new Factory<LoginComponent.Builder>() { @Override public LoginComponent.Builder get() { return new LoginComponentBuilder(); } }; } private final class LoginComponentBuilder implements LoginComponent.Builder { … } private final class LoginComponentImpl implements LoginComponent { private LoginComponentImpl(LoginComponentBuilder builder) { assert builder != null; initialize(builder); } … } } DaggerAppComponent (Generated)
136. public final class DaggerAppComponent implements AppComponent { this.loginBuilderProvider = new Factory<LoginComponent.Builder>() { @Override public LoginComponent.Builder get() { return new LoginComponentBuilder(); } }; } private final class LoginComponentBuilder implements LoginComponent.Builder { … } private final class LoginComponentImpl implements LoginComponent { private LoginComponentImpl(LoginComponentBuilder builder) { assert builder != null; initialize(builder); } … } } DaggerAppComponent (Generated)
137. public final class DaggerAppComponent implements AppComponent { this.loginBuilderProvider = new Factory<LoginComponent.Builder>() { @Override public LoginComponent.Builder get() { return new LoginComponentBuilder(); } }; } private final class LoginComponentBuilder implements LoginComponent.Builder { … } private final class LoginComponentImpl implements LoginComponent { private LoginComponentImpl(LoginComponentBuilder builder) { assert builder != null; initialize(builder); } … } } DaggerAppComponent (Generated)
138. public final class DaggerAppComponent implements AppComponent { this.loginBuilderProvider = new Factory<LoginComponent.Builder>() { @Override public LoginComponent.Builder get() { return new LoginComponentBuilder(); } }; } private final class LoginComponentBuilder implements LoginComponent.Builder { … } private final class LoginComponentImpl implements LoginComponent { private LoginComponentImpl(LoginComponentBuilder builder) { assert builder != null; initialize(builder); } … } } DaggerAppComponent (Generated)
139. public final class DaggerAppComponent implements AppComponent { this.loginBuilderProvider = new Factory<LoginComponent.Builder>() { @Override public LoginComponent.Builder get() { return new LoginComponentBuilder(); } }; } private final class LoginComponentBuilder implements LoginComponent.Builder { … } private final class LoginComponentImpl implements LoginComponent { private LoginComponentImpl(LoginComponentBuilder builder) { assert builder != null; initialize(builder); } … } } DaggerAppComponent (Generated)
140. public final class DaggerAppComponent implements AppComponent { this.loginBuilderProvider = new Factory<LoginComponent.Builder>() { @Override public LoginComponent.Builder get() { return new LoginComponentBuilder(); } }; } private final class LoginComponentBuilder implements LoginComponent.Builder { … } private final class LoginComponentImpl implements LoginComponent { private LoginComponentImpl(LoginComponentBuilder builder) { assert builder != null; initialize(builder); } … } } DaggerAppComponent (Generated)
141. public final class DaggerAppComponent implements AppComponent { this.loginBuilderProvider = new Factory<LoginComponent.Builder>() { @Override public LoginComponent.Builder get() { return new LoginComponentBuilder(); } }; } private final class LoginComponentBuilder implements LoginComponent.Builder { … } private final class LoginComponentImpl implements LoginComponent { private LoginComponentImpl(LoginComponentBuilder builder) { assert builder != null; initialize(builder); } … } } DaggerAppComponent (Generated)
142. @ragdroid @droidconDE SUB COMPONENT VS DEPENDENT COMPONENT
143. <<interface>> AppComponent fun schedulerProvider() @Singleton
144. DaggerAppComponent • schedulerProvider() : @Singleton • userManager : @Singleton LoginComponentImpl <<interface>> AppComponent fun schedulerProvider() @Singleton @ActivityScope
145. DaggerAppComponent • schedulerProvider() : @Singleton • userManager : @Singleton LoginComponentImpl <<interface>> AppComponent fun schedulerProvider() Sub Component LoginComponent accesses any dependencies of DaggerAppComponent directly as inner class can access outer class members. @Singleton @ActivityScope
146. DaggerUserComponent • schedulerProvider • pokemon DaggerAppComponent • schedulerProvider() : @Singleton • userManager : @Singleton LoginComponentImpl <<interface>> AppComponent fun schedulerProvider() HomeComponentImpl ItemsComponentImpl Dependent Component UserComponent accesses any dependencies of DaggerAppComponent via an interface of AppComponent. @Singleton @ActivityScope @UserScope @ActivityScope @ActivityScope Sub Component LoginComponent accesses any dependencies of DaggerAppComponent directly as inner class can access outer class members.
147. DaggerUserComponent • schedulerProvider • pokemon DaggerAppComponent • schedulerProvider() : @Singleton • userManager : @Singleton LoginComponentImpl <<interface>> AppComponent fun schedulerProvider() HomeComponentImpl ItemsComponentImpl @Singleton @ActivityScope @UserScope @ActivityScope @ActivityScope Sub Component LoginComponent accesses any dependencies of DaggerAppComponent directly as inner class can access outer class members. Dependent Component UserComponent accesses any dependencies of DaggerAppComponent via an interface of AppComponent.
148. @ragdroid @droidconDE Custom Scope Advantages • Dependency Lifecycle Management • Modularized code
149. @ragdroid @droidconDE Some Limitations • Repetitive Injection code • Class knows about it’s Injector
150. @ragdroid @droidconDE Some Limitations Dagger 2 Android
151. INTERMEDIATE CONCEPTS “DEFEAT THE DAHAKA”
152. @ragdroid @droidconDE @BINDS
153. @Module public class AppModule { @Provides BaseSchedulerProvider providerSchedulerProvider(SchedulerProvider provider) { return provider; } } @Binds
154. @Module public class AppModule { @Provides BaseSchedulerProvider providerSchedulerProvider(SchedulerProvider provider) { return provider; } } @Binds @Module public abstract class AppModule { @Binds abstract BaseSchedulerProvider providerSchedulerProvider(SchedulerProvider provider); }
155. @ragdroid @droidconDE MULTIBINDING
156. MultiBinding @IntoSet @Provides String - “Hello” @Provides String - “Hi” @Provides String - “How are you?”
157. @Provides String - “Hello” @Provides String - “Hi” @Provides String - “How are you?” @IntoSet @IntoSet @IntoSet MultiBinding @IntoSet
158. @Provides Set<String> {“Hello”, “Hi”, “How are you?”} MultiBinding @IntoSet
159. MultiBinding @IntoMap <<interface>> Contract.Presenter MapPresenter JustPresenter TakePresenter
160. MultiBinding @IntoMap @Provides MapPresenter mapPresenter @Provides JustPresenter justPresenter @Provides TakePresenter takePresenter
161. MultiBinding @IntoMap @Provides MapPresenter mapPresenter @Provides JustPresenter justPresenter @Provides TakePresenter takePresenter @IntoMap @IntoMap @IntoMap
162. MultiBinding @IntoMap @Provides MapPresenter mapPresenter @Provides JustPresenter justPresenter @Provides TakePresenter takePresenter @IntoMap @IntoMap @IntoMap @ClassKey(MapPresenter.java) @ClassKey(JustPresenter.java) @ClassKey(TakePresenter.java)
163. MultiBinding @IntoMap @Provides Map<Class, Contract.Presenter> { mapPresenter, justPresenter, takePresenter }
164. DAGGER 2 ANDROID “BEFRIEND THE BEAST”
165. @ragdroid @droidconDE DAHAKA APPLICATION
166. class DahakaApplication : Application(), HasActivityInjector { @Inject internal lateinit var activityInjector: DispatchingAndroidInjector<Activity> … override fun activityInjector(): AndroidInjector<Activity> { return activityInjector } … } DahakaApplication
167. class DahakaApplication : Application(), HasActivityInjector { @Inject internal lateinit var activityInjector: DispatchingAndroidInjector<Activity> … override fun activityInjector(): AndroidInjector<Activity> { return activityInjector } … } DahakaApplication
168. class DahakaApplication : Application(), HasActivityInjector { @Inject internal lateinit var activityInjector: DispatchingAndroidInjector<Activity> … override fun activityInjector(): AndroidInjector<Activity> { return activityInjector } … } DahakaApplication
169. class DahakaApplication : Application(), HasActivityInjector { @Inject internal lateinit var activityInjector: DispatchingAndroidInjector<Activity> … override fun activityInjector(): AndroidInjector<Activity> { return activityInjector } … } DahakaApplication
170. public interface HasActivityInjector { AndroidInjector<Activity> activityInjector(); } HasActivityInjector
171. HasActivityInjector • A simple interface. • Implementing class “Has” ActivityInjector. • ActivityInjector = AndroidInjector<Activity>. public interface HasActivityInjector { AndroidInjector<Activity> activityInjector(); }
172. HasActivityInjector <<interface>> HasActivityInjector fun activityInjector() : AndroidInjector<Activity>
173. HasActivityInjector <<interface>> HasActivityInjector fun activityInjector() : AndroidInjector<Activity> DahakaApplication • activityInjector : DispatchingAndroidInjector<Activity>
174. HasActivityInjector <<interface>> HasActivityInjector fun activityInjector() : AndroidInjector<Activity> DahakaApplication • activityInjector : DispatchingAndroidInjector<Activity> <<interface>> AndroidInjector<Activity> fun inject(Activity instance)
175. HasActivityInjector <<interface>> HasActivityInjector fun activityInjector() : AndroidInjector<Activity> DahakaApplication • activityInjector : DispatchingAndroidInjector<Activity> DispatchingAndroidInjector<Activity> • inject(Activity activity) • injectorFactories : Map <<interface>> AndroidInjector<Activity> fun inject(Activity instance)
176. DispatchingAndroidInjector • Injects members for Android types : Activity, Fragment, etc • Has a Map<Class, Provider<Factory>> injectorFactories.
177. DispatchingAndroidInjector Provider<LoginActivitySubcomponent.Builder> LoginActivity.class Class<Activity> Provider<Factory<Activity>> DispatchingAndroidInject<Activity> • gets the Subcomponent.Builder from Map. • creates an instance using Builder. • calls component.inject(instance) to perform injections. • Injects members for Android types : Activity, Fragment, etc • Has a Map<Class, Provider<Factory>> injectorFactories.
178. Provider<HomeActivitySubcomponent.Builder> HomeActivity.class ItemsActivity.class Provider<ItemsActivitySubcomponent.Builder> Provider<ProfileFragmentSubcomponent.Builder> ProfileFragment.class MovesFragment.class Provider<MovesFragmentSubcomponent.Builder> Class<Fragment> Provider<Factory<Fragment>> Provider<StatsFragmentSubcomponent.Builder> StatsFragment.class DispatchingAndroidInjector Provider<LoginActivitySubcomponent.Builder> LoginActivity.class Class<Activity> Provider<Factory<Activity>> DispatchingAndroidInject<Activity> DispatchingAndroidInject<Fragment>
179. @ragdroid @droidconDE APP COMPONENT
180. @Singleton @Component(modules = arrayOf(AppModule::class, ApiModule::class, AppBindingModule::class, AndroidSupportInjectionModule::class)) interface AppComponent : AndroidInjector<DaggerApplication> { … } AppComponent
181. AppBindingModule @Singleton @Component(modules = arrayOf(AppModule::class, ApiModule::class, AppBindingModule::class, AndroidSupportInjectionModule::class)) interface AppComponent : AndroidInjector<DaggerApplication> { … } AppComponent
182. @Module abstract class AppBindingModule { @ContributesAndroidInjector(modules = arrayOf(LoginModule::class)) @ActivityScope internal abstract fun loginActivity(): LoginActivity } AppBindingModule
183. @ContributesAndroidInjector @Module abstract class AppBindingModule { @ContributesAndroidInjector(modules = arrayOf(LoginModule::class)) @ActivityScope internal abstract fun loginActivity(): LoginActivity } AppBindingModule
184. @Module abstract class AppBindingModule { @ContributesAndroidInjector(modules = arrayOf(LoginModule::class)) @ActivityScope internal abstract fun loginActivity(): LoginActivity } AppBindingModule • If your Module is stateless. • If your Subcomponent.Builder is simple and doesn’t need to bind anything extra. • @ContributesAndroidInjector will generate the SubComponent for you. • No need to create LoginActivitySubcomponent class in the above case. @ContributesAndroidInjector AppBindingModule
185. @Module abstract class AppBindingModule { @ContributesAndroidInjector(modules = arrayOf(LoginModule::class)) @ActivityScope internal abstract fun loginActivity(): LoginActivity } AppBindingModule @Module abstract class LoginModule { @Binds abstract fun provideLoginPresenter(loginPresenter: LoginPresenter): LoginContract.Presenter } LoginModule
186. @Module(subcomponents = LoginActivitySubcomponent.class) public abstract class AppBindingModule_LoginActivity { @Binds @IntoMap @ActivityKey(LoginActivity.class) abstract AndroidInjector.Factory<? extends Activity> bindAndroidInjectorFactory( LoginActivitySubcomponent.Builder builder); @Subcomponent(modules = LoginModule.class) @ActivityScope public interface LoginActivitySubcomponent extends AndroidInjector<LoginActivity> { @Subcomponent.Builder abstract class Builder extends AndroidInjector.Builder<LoginActivity> {} } } LoginBindingModule(Generated)
187. @Module(subcomponents = LoginActivitySubcomponent.class) public abstract class AppBindingModule_LoginActivity { @Binds @IntoMap @ActivityKey(LoginActivity.class) abstract AndroidInjector.Factory<? extends Activity> bindAndroidInjectorFactory( LoginActivitySubcomponent.Builder builder); @Subcomponent(modules = LoginModule.class) @ActivityScope public interface LoginActivitySubcomponent extends AndroidInjector<LoginActivity> { @Subcomponent.Builder abstract class Builder extends AndroidInjector.Builder<LoginActivity> {} } } LoginBindingModule(Generated)
188. @Module(subcomponents = LoginActivitySubcomponent.class) public abstract class AppBindingModule_LoginActivity { @Binds @IntoMap @ActivityKey(LoginActivity.class) abstract AndroidInjector.Factory<? extends Activity> bindAndroidInjectorFactory( LoginActivitySubcomponent.Builder builder); @Subcomponent(modules = LoginModule.class) @ActivityScope public interface LoginActivitySubcomponent extends AndroidInjector<LoginActivity> { @Subcomponent.Builder abstract class Builder extends AndroidInjector.Builder<LoginActivity> {} } } LoginBindingModule(Generated)
189. @Module(subcomponents = LoginActivitySubcomponent.class) public abstract class AppBindingModule_LoginActivity { @Binds @IntoMap @ActivityKey(LoginActivity.class) abstract AndroidInjector.Factory<? extends Activity> bindAndroidInjectorFactory( LoginActivitySubcomponent.Builder builder); @Subcomponent(modules = LoginModule.class) @ActivityScope public interface LoginActivitySubcomponent extends AndroidInjector<LoginActivity> { @Subcomponent.Builder abstract class Builder extends AndroidInjector.Builder<LoginActivity> {} } } LoginBindingModule(Generated)
190. @Module(subcomponents = LoginActivitySubcomponent.class) public abstract class AppBindingModule_LoginActivity { @Binds @IntoMap @ActivityKey(LoginActivity.class) abstract AndroidInjector.Factory<? extends Activity> bindAndroidInjectorFactory( LoginActivitySubcomponent.Builder builder); @Subcomponent(modules = LoginModule.class) @ActivityScope public interface LoginActivitySubcomponent extends AndroidInjector<LoginActivity> { @Subcomponent.Builder abstract class Builder extends AndroidInjector.Builder<LoginActivity> {} } } LoginBindingModule(Generated)
191. AndroidSupportInjectionModule AppBindingModule @Singleton @Component(modules = arrayOf(AppModule::class, ApiModule::class, AppBindingModule::class, AndroidSupportInjectionModule::class)) interface AppComponent : AndroidInjector<DaggerApplication> { … } AppComponent
192. @Beta @Module(includes = AndroidInjectionModule.class) public abstract class AndroidSupportInjectionModule { @Multibinds abstract Map<Class<? extends Fragment>, AndroidInjector.Factory<? extends Fragment>> supportFragmentInjectorFactories(); private AndroidSupportInjectionModule() {} } @Beta @Module public abstract class AndroidInjectionModule { @Multibinds abstract Map<Class<? extends Activity>, AndroidInjector.Factory<? extends Activity>> activityInjectorFactories(); @Multibinds abstract Map<Class<? extends Fragment>, AndroidInjector.Factory<? extends Fragment>> fragmentInjectorFactories(); … } AndroidSupportInjectionModule (dagger.android)
193. @Beta @Module(includes = AndroidInjectionModule.class) public abstract class AndroidSupportInjectionModule { @Multibinds abstract Map<Class<? extends Fragment>, AndroidInjector.Factory<? extends Fragment>> supportFragmentInjectorFactories(); private AndroidSupportInjectionModule() {} } @Beta @Module public abstract class AndroidInjectionModule { @Multibinds abstract Map<Class<? extends Activity>, AndroidInjector.Factory<? extends Activity>> activityInjectorFactories(); @Multibinds abstract Map<Class<? extends Fragment>, AndroidInjector.Factory<? extends Fragment>> fragmentInjectorFactories(); … } AndroidSupportInjectionModule (dagger.android)
194. @Beta @Module(includes = AndroidInjectionModule.class) public abstract class AndroidSupportInjectionModule { @Multibinds abstract Map<Class<? extends Fragment>, AndroidInjector.Factory<? extends Fragment>> supportFragmentInjectorFactories(); private AndroidSupportInjectionModule() {} } @Beta @Module public abstract class AndroidInjectionModule { @Multibinds abstract Map<Class<? extends Activity>, AndroidInjector.Factory<? extends Activity>> activityInjectorFactories(); @Multibinds abstract Map<Class<? extends Fragment>, AndroidInjector.Factory<? extends Fragment>> fragmentInjectorFactories(); … } AndroidSupportInjectionModule (dagger.android)
195. @Beta @Module(includes = AndroidInjectionModule.class) public abstract class AndroidSupportInjectionModule { @Multibinds abstract Map<Class<? extends Fragment>, AndroidInjector.Factory<? extends Fragment>> supportFragmentInjectorFactories(); private AndroidSupportInjectionModule() {} } @Beta @Module public abstract class AndroidInjectionModule { @Multibinds abstract Map<Class<? extends Activity>, AndroidInjector.Factory<? extends Activity>> activityInjectorFactories(); @Multibinds abstract Map<Class<? extends Fragment>, AndroidInjector.Factory<? extends Fragment>> fragmentInjectorFactories(); … } AndroidSupportInjectionModule (dagger.android)
196. @Beta @Module(includes = AndroidInjectionModule.class) public abstract class AndroidSupportInjectionModule { @Multibinds abstract Map<Class<? extends Fragment>, AndroidInjector.Factory<? extends Fragment>> supportFragmentInjectorFactories(); private AndroidSupportInjectionModule() {} } @Beta @Module public abstract class AndroidInjectionModule { @Multibinds abstract Map<Class<? extends Activity>, AndroidInjector.Factory<? extends Activity>> activityInjectorFactories(); @Multibinds abstract Map<Class<? extends Fragment>, AndroidInjector.Factory<? extends Fragment>> fragmentInjectorFactories(); … } AndroidSupportInjectionModule (dagger.android)
197. @ragdroid @droidconDE LOGIN ACTIVITY
198. public class LoginActivity { @Inject LoginContract.Presenter presenter; @Override protected void onCreate(Bundle savedInstanceState) { AndroidInjection.inject(this); } } LoginActivity
199. AndroidInjection.inject(LoginActivity) LoginActivity public class LoginActivity { @Inject LoginContract.Presenter presenter; @Override protected void onCreate(Bundle savedInstanceState) { AndroidInjection.inject(this); } }
200. AndroidInjection.inject(LoginActivity) AndroidInjection.inje
201. AndroidInjection.inject(LoginActivity) AndroidInjection.inje AndroidInjection
202. AndroidInjection.inject(LoginActivity) AndroidInjection.inje AndroidInjection DaggerAppComponent
203. AndroidInjection.inject(LoginActivity) AndroidInjection.inje AndroidInjection DaggerAppComponent AppBindingModule_LoginActivity DispatchingAndroidInjector
204. AndroidInjection.inject(LoginActivity) AndroidInjection.inje AndroidInjection DaggerAppComponent AppBindingModule_LoginActivity DispatchingAndroidInjector
205. AndroidInjection.inject(LoginActivity) AndroidInjection.inje AndroidInjection DaggerAppComponent AppBindingModule_LoginActivity DispatchingAndroidInjector ApiModule_ProvideRetrofitFactory AppModule_ProviderSchedulerProviderFactory ApiModule_ProvidePokemonServiceFactory ApiModule_ProvideRetrofitFactory AppModule_ProviderSchedulerProviderFactory ApiModule_ProvidePokemonServiceFactory
206. @ragdroid @droidconDE BEFRIEND THE BEAST “You can not change your fate, No droid can.”
207. AndroidInjection.inject(LoginActivity)
208. AndroidInjection.inject(LoginActivity) activity .getApplication() LoginActivity
209. AndroidInjection.inject(LoginActivity) activity .getApplication() LoginActivity application .activityInjector() DahakaApplication : HasActivityInjector
210. AndroidInjection.inject(LoginActivity) activity .getApplication() LoginActivity application .activityInjector() DahakaApplication : HasActivityInjector activityInjector .inject(activity) DispatchingAndroidInjector : AndroidInjector
211. AndroidInjection.inject(LoginActivity) activity .getApplication() LoginActivity application .activityInjector() DahakaApplication : HasActivityInjector activityInjector .inject(activity) DispatchingAndroidInjector : AndroidInjector
212. DispatchingAndroidInjector.inject(LoginActivity) injectorFactories .get(LoginActivity.class) DispatchingAndroidInjector : AndroidInjector
213. DispatchingAndroidInjector : AndroidInjector Factory<LoginActivity> : LoginSubcomponent.Builder injectorFactories .get(LoginActivity.class) DispatchingAndroidInjector.inject(LoginActivity) builder .build()
214. DispatchingAndroidInjector : AndroidInjector Factory<LoginActivity> : LoginSubcomponent.Builder component .inject(activity) LoginSubcomponent injectorFactories .get(LoginActivity.class) DispatchingAndroidInjector.inject(LoginActivity) builder .build()
215. DispatchingAndroidInjector : AndroidInjector builder .build() Factory<LoginActivity> : LoginSubcomponent.Builder component .inject(activity) LoginSubcomponent DispatchingAndroidInjector.inject(LoginActivity) injectorFactories .get(LoginActivity.class)
216. • DaggerApplication • DaggerActivity • DaggerBroadcastReceiver • DaggerContentProvider • DaggerFragment • DaggerIntentService • DaggerService Dagger Boilerplate classes
217. @ragdroid @droidconDE TESTING WITH DAGGER 2 ANDROID
218. public class LoginActivity { @Inject LoginContract.Presenter presenter; @Override protected void onCreate(Bundle savedInstanceState) { AndroidInjection.inject(this); } } LoginActivity
219. public class LoginActivity { @Inject LoginContract.Presenter presenter; @Override protected void onCreate(Bundle savedInstanceState) { AndroidInjection.inject(this); } } LoginActivity
220. @Module public class TestLoginModule { @Mock LoginPresenter loginPresenter; public TestLoginModule() { MockitoAnnotations.initMocks(this); } @Provides @ActivityScope public LoginContract.Presenter provideLoginPresenter() { return loginPresenter; } } TestLoginModule
221. @Module public class TestLoginModule { @Mock LoginPresenter loginPresenter; public TestLoginModule() { MockitoAnnotations.initMocks(this); } @Provides @ActivityScope public LoginContract.Presenter provideLoginPresenter() { return loginPresenter; } } TestLoginModule
222. @Module public class TestLoginModule { @Mock LoginPresenter loginPresenter; public TestLoginModule() { MockitoAnnotations.initMocks(this); } @Provides @ActivityScope public LoginContract.Presenter provideLoginPresenter() { return loginPresenter; } } TestLoginModule
223. Demo Code • Dahaka Demo : https://github.com/ragdroid/Dahaka • Branches : • dagger-android : Pokemon app using dagger-android (With Tests, Fragments) • dagger-android-dependent-comp : dagger-android with Dependent Component • dagger-android-dependent-comp-kotlin : In Kotlin • subcomponent : UserComponent as subcomponent • dependent-component : UserComponent as dependent component • dependent-component-kotlin : In Kotlin
224. @ragdroid @droidconDE Dagger 2 Android = Dahaka • D • A • H • A • K • A Dagger Android HasActivityInjector AndroidInjection Keys AndroidInjector
225. @ragdroid @droidconDE Dagger 2 Android “You can not change your fate, No droid can” Let’s befriend the beast instead.
226. Acknowledgements • Dagger Recipies : Miroslaw Stanek (@froger_mcs) https://about.me/froger_mcs • todo-mvp-dagger : Mike Nakhimovich (@friendlyMikhail ) https://github.com/googlesamples/android-architecture/tree/todo-mvp-dagger • Android Dialogs : Mike Nakhimovich https://www.youtube.com/watch?v=KwRXQ6nT7jQ • Proof Reading : Ritesh Gupta (@_riteshhh) • Migrate to Kotlin : Ravindra Kumar (@ravidsrk)
227. What Next? • Dagger Documentation : https://google.github.io/dagger// • todo-mvp-dagger : Mike Nakhimovich (@friendlyMikhail ) https://github.com/googlesamples/android-architecture/tree/todo-mvp-dagger • Android Dialogs : Mike Nakhimovich https://www.youtube.com/watch?v=KwRXQ6nT7jQ • Dagger Example https://github.com/ragdroid/Dahaka • Testing article https://android.jlelse.eu/testing-your-app-with-dagger-2-c91cdc0860fb • Dagger and the Dahaka Series : https://medium.com/@ragdroid
228. Other References • Theme : Prince of Persia https://en.wikipedia.org/wiki/Prince_of_Persia • Dahaka https://files.gamebanana.com/img/ico/sprays/dahaka.png • Dagger https://in.pinterest.com/pin/397442735844321339/ • Android http://www.pngmart.com/files/4/Android-PNG-Image.png
229. @ragdroid @droidconDE CUT SCENES
230. Dagger 2 Android “Defeat the Dahaka" Garima Jain @ragdroid
231. Dagger 2 Android “Defeat the Dahaka" Garima Jain @ragdroid
232. FUELED http://fueled.com/garima garima@fueled.com VIELEN DANK THANK YOU
233. FUELED http://fueled.com/garima garima@fueled.com Q & A DISCUSSION @ragdroid