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MODULARIZING ANDROID APPLICATIONS Gérard Paligot Othman Barhdadi

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Othman Barhdadi Technical Leader Plus @Modis Gérard Paligot Technical Leader Android @Decathlon

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PRESENTATION Plus

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APPLICATION ANDROID MONOLITHIQUE

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APPLICATION ANDROID MONOLITHIQUE • Développement du deeplink • Maintenance difficile des applications inter-connectées • Durée de vie limitée des applications inter-connectées • Investissement à courte durée des marques Multiplication des applications

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APPLICATION ANDROID MONOLITHIQUE Application Plus

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APPLICATION ANDROID MONOLITHIQUE Application Plus avec les écrans de l’équipement du sportif

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APPLICATION ANDROID MODULAIRE

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DÉPENDANCES

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IMPLEMENTATION VS API implementation noun Garde une dépendance locale au module déclaré et ne l’expose pas dans son api à travers le graphe de dépendance. api noun Permet l’utilisation de la dépendance à travers tout le graphe de dépendance du moment qu’elle est propagée.

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OPTIMISATION ET OBFUSCATION

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apply plugin: 'com.android.application' apply plugin: 'kotlin-android' apply plugin: 'kotlin-android-extensions' apply plugin: 'kotlin-kapt' android { compileSdkVersion versions.compileSdk buildToolsVersion versions.buildTools defaultConfig { … } buildTypes { release { minifyEnabled true shrinkResources true proguardFiles file('proguard-rules.pro') } } // … }

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# No rules needed for now.

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apply plugin: 'com.android.library' apply plugin: 'kotlin-android' apply plugin: 'kotlin-android-extensions' apply plugin: 'kotlin-kapt' android { compileSdkVersion versions.compileSdk defaultConfig { // … consumerProguardFiles 'consumer-proguard-rules.pro' } }

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## Okio -dontwarn org.codehaus.mojo.animal_sniffer.* ## OkHttp -dontwarn javax.annotation.** -keepnames class okhttp3.internal.publicsuffix.PublicSuffixDatabase -dontwarn okhttp3.internal.platform.ConscryptPlatform ## Retrofit -keepattributes Signature, InnerClasses, EnclosingMethod -keepclassmembers,allowshrinking,allowobfuscation interface * { @retrofit2.http.* ; } -dontwarn kotlin.Unit -dontwarn retrofit2.-KotlinExtensions ## Kotlin -keep class kotlin.Metadata { *; } -keepclassmembers class kotlin.Metadata { public ; }

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MODULE PAR L’EXEMPLE

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CRÉATION D’UN MODULE

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class SportEquipmentApplication

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class SportEquipmentApplication : HasSupportFragmentInjector

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class SportEquipmentApplication : HasSupportFragmentInjector { @Inject lateinit var injector: DispatchingAndroidInjector fun inject(fragment: Fragment) { supportFragmentInjector().inject(fragment) } override fun supportFragmentInjector(): AndroidInjector = injector }

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class SportEquipmentApplication : HasSupportFragmentInjector { // … fun onCreate(context: Context) { initApp(context).let { this.app = it app.inject(this) } } private fun initApp(context: Context): AppComponent = DaggerAppComponent.builder() .application(context.applicationContext as Application) .context(context) .build() // … }

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package extensions import android.content.Context import androidx.fragment.app.Fragment import feature.SportEquipmentApplication private val appSingleton = SportEquipmentApplication() val Context.moduleApplication: SportEquipmentApplication get() = appSingleton val Fragment.moduleApplication: SportEquipmentApplication get() = appSingleton

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class SportEquipmentMainFragment : Fragment()

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class SportEquipmentMainFragment : Fragment() { override fun onAttach(context: Context) { super.onAttach(context) moduleApplication.onCreate(context) } }

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class SportEquipmentMainFragment : Fragment() { override fun onAttach(context: Context) { super.onAttach(context) moduleApplication.onCreate(context) } override fun onViewCreated(view: View, savedInstanceState: Bundle?) { super.onViewCreated(view, savedInstanceState) inject(context!!.moduleApplication) } override fun inject(panoplyApplication: SportEquipmentApplication) = panoplyApplication.inject(this) }

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NAVIGATION INTERNE D’UN MODULE

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interface ScreenSaverContracts

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interface ScreenSaverContracts { interface View { fun show() } interface Presenter { fun load() } interface NavigationListener { fun onScreenTouched() } }

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interface SportPageContracts { interface View { fun show() } interface Presenter { fun load() } interface NavigationListener { fun onProductSelected(id) } }

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class SportEquipmentMainFragment : Fragment(), SportPageContracts.NavigationListener, ScreenSaverContracts.NavigationListener { // … }

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class SportEquipmentMainFragment : Fragment(), SportPageContracts.NavigationListener, ScreenSaverContracts.NavigationListener { // … override fun onScreenTouched() { // navigation inside current module show(SportPageFragment(), addToBackStack = true) } }

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class SportEquipmentMainFragment : Fragment(), SportPageContracts.NavigationListener, ScreenSaverContracts.NavigationListener { // … override fun onScreenTouched() { // navigation inside current module show(SportPageFragment(), addToBackStack = true) } override fun onProductSelected(id) { // navigation outside current module } }

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NAVIGATION ENTRE MODULES

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interface MainComContracts

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interface MainComContracts { interface Module }

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interface MainComContracts { interface Module { fun onBackPressed(): Boolean = false fun onUserInteraction() {} fun onRefreshModule() {} } }

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class MainActivity : AppCompatActivity()

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class MainActivity : AppCompatActivity() { private lateinit var currentFragment: MainComContracts.Module }

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class MainActivity : AppCompatActivity() { private lateinit var currentFragment: MainComContracts.Module override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) if (savedInstanceState == null) { replaceFragment(SportEquipmentMainFragment()) } else { currentFragment = supportFragmentManager .findFragmentById(R.id.container) as? MainComContracts.Module ?: throw IllegalStateException("No fragment found!") } } }

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class MainActivity : AppCompatActivity() { private lateinit var currentFragment: MainComContracts.Module override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) if (savedInstanceState == null) { replaceFragment(SportEquipmentMainFragment()) } else { currentFragment = supportFragmentManager .findFragmentById(R.id.container) as? MainComContracts.Module ?: throw IllegalStateException("No fragment found!") } } private fun replaceFragment(fragment: T) where T : Fragment, T : MainComContracts.Module { supportFragmentManager.inTransaction { currentFragment = fragment replace(R.id.container, fragment) } } }

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class MainActivity : AppCompatActivity() { private lateinit var currentFragment: MainComContracts.Module }

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class MainActivity : AppCompatActivity() { private lateinit var currentFragment: MainComContracts.Module override fun onBackPressed() { if (!currentFragment.onBackPressed()) { super.onBackPressed() } } }

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class MainActivity : AppCompatActivity() { private lateinit var currentFragment: MainComContracts.Module override fun onBackPressed() { if (!currentFragment.onBackPressed()) { super.onBackPressed() } } override fun onUserInteraction() { super.onUserInteraction() currentFragment.onUserInteraction() } }

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class MainActivity : AppCompatActivity() { private lateinit var currentFragment: MainComContracts.Module override fun onBackPressed() { if (!currentFragment.onBackPressed()) { super.onBackPressed() } } override fun onUserInteraction() { super.onUserInteraction() currentFragment.onUserInteraction() } fun onTimeoutOccurred() { currentFragment.onRefreshModule() } }

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interface MainComContracts { interface Module { … } }

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interface MainComContracts { interface Data { fun getStoreId(): String fun getActualLanguageCode(): String fun getActualCountryCode(): String fun getDeviceId(): String fun getKioskModel(): String } interface Module { … } }

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interface MainComContracts { interface Toolbar interface Data { fun getStoreId(): String fun getActualLanguageCode(): String fun getActualCountryCode(): String fun getDeviceId(): String fun getKioskModel(): String } interface Module { … } }

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interface MainComContracts { interface Toolbar interface Navigation { fun onShowProduct(codeModel: String?) fun onAddProductToBasket(codeModel: String?) } interface Data { fun getStoreId(): String fun getActualLanguageCode(): String fun getActualCountryCode(): String fun getDeviceId(): String fun getKioskModel(): String } interface Module { … } }

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class SportEquipmentMainFragment : Fragment(), SportPageContracts.NavigationListener, ScreenSaverContracts.NavigationListener { // … override fun onScreenTouched() { // navigation inside current module show(SportPageFragment(), addToBackStack = true) } override fun onProductSelected(id) { // navigation outside current module } }

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class SportEquipmentMainFragment : Fragment(), SportPageContracts.NavigationListener, ScreenSaverContracts.NavigationListener { // … override fun onScreenTouched() { // navigation inside current module show(SportPageFragment(), addToBackStack = true) } override fun onProductSelected(id) { (fragment.activity as MainComContracts.Navigation).onShowProduct(id) } }

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NOS OBJECTIFS

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NOS OBJECTIFS • Team working

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NOS OBJECTIFS • Team working • Découplage de code

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NOS OBJECTIFS • Team working • Découplage de code • Contributions externes

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NOS OBJECTIFS • Team working • Découplage de code • Contributions externes • Unification des applications

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NOS OBJECTIFS • Team working • Découplage de code • Contributions externes • Unification des applications • Réutilisation de code

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NOS OBJECTIFS • Team working • Découplage de code • Contributions externes • Unification des applications • Réutilisation de code • Diversité des technologies

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DIFFICULTÉS

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DIFFICULTÉS • Diversité des technologies

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DIFFICULTÉS • Diversité des technologies • Redondance de code

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DIFFICULTÉS • Diversité des technologies • Redondance de code • Identification des dépendances

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DIFFICULTÉS • Diversité des technologies • Redondance de code • Identification des dépendances • Unification de la vision de l'approche modulaire

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LET’S THINK ABOUT THE FUTURE…

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THE NAVIGATION ARCHITECTURE COMPONENT

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APP BUNDLE

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MODULARIZING ANDROID APPLICATIONS Gérard Paligot Othman Barhdadi