Multimodularization Scaling Android app

Breaking techniques using examples. Patterns needed to follow when you want to expose navigation or data from feature modules.

Transcript

1. Multi Modularization Rohit Singh
2. :app Monolithic Architecture
3. Motivations For Modularization
4. Separation Of Concerns
5. Initial Feature requirement
6. Initial Feature requirement Later Design changes
7. Build Time Improvement
8. ├── app ├── features │ ├── transport │ ├── food │ └── payments └── resources ├── layout ├── activity_transport.xml ├── activity_food.xml └── activity_payments.xml
9. ├── transport └── resource ├── layout ├── activity_transport.xml ├── food └── resource ├── layout ├── activity_food.xml ├── payments └── resource ├── layout ├── activity_payments.xml ├── app ├── features │ ├── transport │ ├── food │ └── payments └── resources ├── layout ├── activity_transport.xml ├── activity_food.xml └── activity_payments.xml
10. ├── transport └── resource ├── layout ├── activity_transport.xml ├── food └── resource ├── layout ├── activity_food.xml ├── payments └── resource ├── layout ├── activity_payments.xml ├── app ├── features │ ├── transport │ ├── food │ └── payments └── resources ├── layout ├── activity_transport.xml ├── activity_food.xml └── activity_payments.xml
11. ├── transport └── resource ├── layout ├── activity_transport.xml ├── food └── resource ├── layout ├── activity_food.xml ├── payments └── resource ├── layout ├── activity_payments.xml ├── app ├── features │ ├── transport │ ├── food │ └── payments └── resources ├── layout ├── activity_transport.xml ├── activity_food.xml └── activity_payments.xml
12. Scale :app
13. :app
14. For every 6 MB increase to an APK’s size, we see a decrease in the install conversion rate of 1%. - Google Play Apps & Games
15. Instant apps Dynamic Delivery
16. Experiment With New Technology
17. How do we Modularize ?
18. :app apply plugin: ‘com.android.application'
19. :app :transport :food :payments apply plugin: 'com.android.library'
20. :app :transport :food :payments apply plugin: 'com.android.library'
21. apply plugin: 'com.android.library' apply plugin: 'kotlin' apply plugin: 'java-library' :common :network :logger :utils :analytics :styles Core Module :app :transport :food :payments
22. Monolithic Architecture ├── app ├── features │ ├── transport │ ├── food │ └── payments └── resources ├── layout ├── activity_transport.xml ├── activity_food.xml └── activity_payments.xml Navigation Intent(context, PaymentActivity:class.java)
23. Modualrize Architecture Navigation ├──payments └── resource ├── layout ├── activity_payments.xml ├── transport └── resource ├── layout ├── activity_transport.xml Independent Modules Transport Module should not depend on payments module
24. Modualrize Architecture Navigation
25. Abstraction
26. app transport payments payments-bridge Interface Module Payment Interface provided by module Provides Implementation of Interfaces
27. How app would provide interface implementation to transport ?
28. We would be using Dagger as DI
29. @Module object CoreModule { @AppScope @JvmStatic @Provides fun provideCommonObject() : CommonObject = CommonObject() } Dagger Core Module
30. App Component inside app grade module @AppScope @Component( modules = [ CoreModule::class] ) interface AppComponent { fun inject(app: App) }
31. Payments exposes Interface in payments-bridge module interface PaymentsNavigationUseCase { fun navigateToPaymentMethodScreen(context: Context) } interface PaymentsDataProvider { fun provideBalanceStream() : Observable<Data> }
32. Interface Implementation exposed as Dagger Module inside payments @Module object PaymentsNavigation Module { @Provides @JvmStatic fun provideNavigationUsecase() : PaymentsNavigationUseCase = PaymentsNavigationUseCaseImpl() } @Module object PaymentsDataProviderModule { @Provides @JvmStatic fun providesPaymentsDataProvider() : PaymentsDataProvider = PaymentsDataProviderImpl() }
33. App Component inside app grade module @AppScope @Component( modules = [ CoreModule::class, PaymentsNavigation Module::class, PaymentsDataProviderModule::class] ) interface AppComponent { fun inject(app: App) }
34. Transport Component @Component( dependencies = [TransportActivityComponentParent::class] ) interface TransportActivityComponent { fun inject(activity: TransportActivity) } interface TransportComponentParent { fun paymentsNavigationUseCase(): PaymentsNavigationUseCase fun commonObject(): CommonObject }
35. Transport Component @Component( dependencies = [TransportActivityComponentParent::class] ) interface TransportActivityComponent { fun inject(activity: TransportActivity) } interface TransportComponentParent { fun featureOneNavigationUseCase(): PaymentsNavigationUseCase fun commonObject(): CommonObject }
36. @AppScope @Component( modules = [ CoreModule::class, PaymentsNavigationModule::class, PaymentsDataProviderModule::class] ) interface AppComponent : TransportComponentParent { fun inject(app: App) } App Component inside app grade module
37. Since we are using dependencies we need to get implementation from App Component
38. interface ParentHost { fun <T> extractParent(): T }
39. inline fun <reified T : Any> Context.parent(): T? { var ctx = this while (ctx !is Application) { ctx = ctx.applicationContext } if(ctx is ParentHost){ return ctx.extractParent<T>() } return null } Extension Function
40. Application Class class DemoApp : Application(), ParentHost { override fun <T> extractParent(): T { return component as T } lateinit var component: AppComponent override fun onCreate() { super.onCreate() component = DaggerAppComponent.create() component.inject(this) } }
41. In Transport Activity DaggerTransportActivityComponent .factory() .create() .transportComponentParent(parent()) .build() .inject(this)
42. Summary 1. Split Payments into 2 modules: “Payment interface” & “Payment implementation” 2. Include payment interface module inside transport module 3. Transport module relies on payment interface and its implementation is provided by app.
43. Other Approach
44. Deeplink val intent = Intent(ACTION_VIEW, Uri.parse(“demo://payments")) startActivity(intent) <activity android:name=".PaymentsActivity" android:label="@string/title_payments"> <intent-filter> <data android:host="demo" android:scheme="payments"/> </intent-filter> </activity> Manifest
45. Navigation Component
46. Profiling & Measuring
47. Build Scan •./gradlew <my-tasks> —scan •Accept license •Build information is sent to Gradle’s server •You can delete it after
48. Build Scan
49. Build Scan
50. Build Scan
51. Build Profile •./gradlew <my-tasks> —profile •Generates a html report in build folder
52. Build Profile
53. Faster Compilation
54. Module A Module B api implementation
55. Module A Module B Module C app Module D Module E Module F api implementation
56. Module A Module B Module C app Module D Module E Module F api implementation
57. Module A Module B Module C app Module D Module E Module F api implementation
58. Build Process For Library Dependencies Preparation Merging Resources & Processing Manifest Compiling Postprocessing Packaging & publishing
59. Build Process For Library Dependencies Preparation Merging Resources & Processing Manifest Compiling Postprocessing Packaging & publishing
60. Create Pure Java Or Kotlin Library
61. :libjava:assemble of the base java plugin https://medium.com/google-developer-experts/19-tips-for-gradle-in-android-projects-2019-edition-11af704eb06e
62. :lib1:assembleDebug of the android library https://medium.com/google-developer-experts/19-tips-for-gradle-in-android-projects-2019-edition-11af704eb06e
63. Export your modules to aar or jar files if stable
64. gradle.properties
65. Enabling Gradle Daemon org.gradle.daemon=true
66. Parallel Builds org.gradle.parallel=true kotlin.parallel.tasks.in.project=true
67. Caching org.gradle.cache=true
68. Kapt Caching kapt.incremental.apt = true Kotlin version >= 1.3.3.0 kapt.use.worker.api=true kapt.include.compile.classpath=false
69. Enable Incremental Compilation kotlin.incremental=true kotlin.incremental.usePreciseJavaTracking=true //For kotlin+java
70. Memory Allocation For Gradle Daemon org.gradle.jvmargs=-Xmx<value>m
71. Memory Allocation For Gradle Daemon
72. PreDex Libraries dexOptions { preDexLibraries true }
73. Thank You Rohit Singh @rohitsingh77 https://github.com/rohitsingh14101992/modular