Développement Android et iOS avec Kotlin Multiplatform

Google Technologies Week Guinea 2020

Transcript

1. 22 Mai 2020 | Google Technologies Week Guinea 2020 Développement Android et iOS avec Kotlin Multiplatform Charles “Chuck” Greb Développeur Mobile Co-Lead GDG Ratoma @ecgreb
6. Kotlin / Java
7. Presentation Model Storage Network View Kotlin / Java
8. Presentation Model Storage Network View Kotlin / Java
9. Presentation Model Storage Network View Kotlin / Java
10. Presentation Model Storage Network View Kotlin / Java Swift / Obj-C
11. Presentation Model Storage Network View Kotlin / Java Swift / Obj-C JS
12. Presentation Model Storage Network View Presentation Presentation Model Model Storage Storage Network Network View View Kotlin / Java Swift / Obj-C JS
13. Presentation Model Storage Network View View View Kotlin / Java Swift / Obj-C JS
14. Multiplatform Presentation Model Storage Network View View View Kotlin / Java Swift / Obj-C JS
15. Multiplatform Presentation Model Storage Network Activity HTML Document UIViewController Kotlin / Java Swift / Obj-C JS
16. Common
17. JVM Native JS Common
18. JVM Native JS Common Android Java 6 Java 8
19. JVM Native JS Common Android Java 6 Java 8 Browser Node
20. JVM Native JS Common Android Java 6 Java 8 Browser Node iOS Mac Windows Linux WebAssembly …
21. JVM Native JS Common Android Java 6 Java 8 Browser Node iOS Mac Windows Linux WebAssembly …
22. Pourquoi?
23. Avantages et inconvénients Pros and cons Cross-Platform Frameworks Kotlin Multiplatform Pros Single language (Dart, JS, C#) Rapid development Easy to learn Native languages (Kotlin / Swift) Native UI Interoperability Cons Framework UI only Access to system / OS Performance Multiple languages Project setup Learning curve
25. juillet
 2011 Jetbrains
 announces
 project
 Kotlin
26. juillet
 2011 Jetbrains
 announces
 project
 Kotlin janvier
 2015 Using project
 Kotlin for
 Android
 published
27. juillet
 2011 Jetbrains
 announces
 project
 Kotlin mai
 2017 Google
 announces
 official support
 for Kotlin janvier
 2015 Using project
 Kotlin for
 Android
 published
28. juillet
 2011 Jetbrains
 announces
 project
 Kotlin mai
 2017 Google
 announces
 official support
 for Kotlin janvier
 2015 Using project
 Kotlin for
 Android
 published octobre
 2018 Kotlin 1.3
 release with
 experimental
 multiplatform
 suppot
29. juillet
 2011 Jetbrains
 announces
 project
 Kotlin mai
 2017 Google
 announces
 official support
 for Kotlin janvier
 2015 Using project
 Kotlin for
 Android
 published octobre
 2018 Kotlin 1.3
 release with
 experimental
 multiplatform
 suppot mars
 2020 Kotlin1.3.70
 release
30. juillet
 2011 Jetbrains
 announces
 project
 Kotlin mai
 2017 Google
 announces
 official support
 for Kotlin janvier
 2015 Using project
 Kotlin for
 Android
 published octobre
 2018 Kotlin 1.3
 release with
 experimental
 multiplatform
 suppot mars
 2020 Kotlin1.3.70
 release printemps
 2020 Kotlin1.4
 release
32. Kotlin Multiplatform tl;dr • Build configuration • Code sharing • expect and actual • Using typealias • Interfaces • Multiplatform libraries • Multiplatform IDEs
33. Build configuration
34. • Apply plugins • Build targets and source sets • Android dependencies • iOS dependencies Build configuration plugins { kotlin("multiplatform") id("org.jetbrains.kotlin.native.cocoapods")
 id(“com.android.library") } shared/build.gradle.kts
35. • Apply plugins • Build targets and source sets • Android dependencies • iOS dependencies Build configuration kotlin { android() iosX64("ios") sourceSets["commonMain"].dependencies { // ... } sourceSets["androidMain"].dependencies { // ... } sourceSets["iosMain"].dependencies { // ... } cocoapodsext { framework { isStatic = false } } } shared/build.gradle.kts
36. • Apply plugins • Build targets and source sets • Android dependencies • iOS dependencies Build configuration dependencies { implementation(kotlin("stdlib-jdk7", "1.3.72")) implementation(project(":shared")) ... } app/build.gradle.kts
37. • Apply plugins • Build targets and source sets • Android dependencies • iOS dependencies Build configuration use_frameworks! platform :ios, '9.0' install! 'cocoapods', :deterministic_uuids => false target ‘my-ios-app‘ do pod 'shared', :path => '../shared/' end ios/Podfile
38. Code sharing
39. • expect and actual • Using typealias • Interfaces Code sharing expect fun currentTimeMillis(): Long src/commonMain/kotlin/Platform.kt actual fun currentTimeMillis(): Long = System.currentTimeMillis() src/androidMain/kotlin/PlatformAndroid.kt actual fun currentTimeMillis(): Long = (NSDate().timeIntervalSince1970 * 1000).toLong() src/iosMain/kotlin/PlatformiOS.kt
40. • expect and actual • Using typealias • Interfaces Code sharing expect class Date(year: Int, month: Int, day: Int) src/commonMain/kotlin/Date.kt actual typealias Date = java.util.GregorianCalendar src/androidMain/kotlin/Date.kt src/iosMain/kotlin/Date.kt actual class Date { actual constructor(year: Int, month: Int, day: Int) { val calendar = NSCalendar.currentCalendar val components = NSDateComponents() components.setDay(day.toLong()) components.setMonth(month.toLong()) components.setYear(year.toLong()) return calendar.dateFromComponents(comps)!! } }
41. • expect and actual • Using typealias • Interfaces Code sharing interface ApplicationStorage { fun putBoolean(key: String, value: Boolean) } src/commonMain/kotlin/ApplicationStorage.kt internal class AndroidStorage(context: Context) : ApplicationStorage { private val prefs = PreferenceManager .getDefaultSharedPreferences(context) override fun putBoolean(key: String, value: Boolean) { prefs.edit().putBoolean(key, value).apply() } } src/androidMain/kotlin/AndroidStorage.kt internal class IosStorage : ApplicationStorage { private val delegate: NSUserDefaults = NSUserDefaults.standardUserDefaults() override fun putBoolean(key: String, value: Boolean) { delegate.setBool(value, key) } } src/iosMain/kotlin/iOSStorage.kt
42. Multiplatform libraries kotlinx.coroutines Asynchronous or non-blocking programming https://github.com/Kotlin/kotlinx.coroutines Koin Multiplatform dependency injection https://insert-koin.io/ Ktor HTTP utility for connected apps https://ktor.io SQLDelight Typesafe DB management https://cashapp.github.io/sqldelight/ Multiplatform Settings Simple key-value data storage https://github.com/russhwolf/multiplatform-settings Stately Concurrency and state management https://github.com/touchlab/Stately Kermit Composable logging utility https://github.com/touchlab/Kermit Oolong Model-View-Update (MVU) architecture https://oolong-kt.org/ New in Koin 3.0 !
43. Multiplatform IDEs
44. Multiplatform IDEs
45. KaMP Kit https://github.com/touchlab/KaMPKit/
46. La Demo
47. 22 Mai 2020 | Google Technologies Week Guinea 2020 fin. Charles “Chuck” Greb Développeur Mobile Co-Lead GDG Ratoma @ecgreb