Introducing Kotlin Multiplatform in an existing project | Kotlin Dev Day Amsterdam

After discovering a new interesting technology or framework, you will probably start asking yourself how to integrate it into an existing project. That’s because, the possibility to start with a blank canvas is rare (not impossible, but rare).

This is also the case for Kotlin Multiplatform, and even though it is still in alpha, you can already start to use it in production applications.

In this talk, we will understand which part of the code can be a starting point for sharing, how to consume the shared code and how to structure an existing project to have an as smooth as possible integration.

Transcript

1. @marcoGomier
   Kotlin Dev Day
   Introducing
   
   
   Kotlin Multiplatform
   in an existing project
   Marco Gomiero
   👨💻 Senior Android Engineer @ TIER
   

   Google Developer Expert for Kotlin
   

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2. Kotlin Dev Day - @marcoGomier
   Kotlin Multiplatform
   Share as much [NO UI] code as possible on different platforms
   

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3. Kotlin Dev Day - @marcoGomier
   Common Kotlin
   Kotlin/JVM Kotlin/JS Kotlin/Native
   Java
   
   
   Android
   Browser
   
   
   NodeJS
   Android NDK
   
   
   iOS
   
   
   macOS
   
   
   watchOS
   
   
   tvOS
   
   
   Linux
   
   
   Windows
   

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4. Kotlin Dev Day - @marcoGomier
   Common Kotlin
   Kotlin/JVM Kotlin/JS Kotlin/Native
   Java
   
   
   Android
   Browser
   
   
   NodeJS
   Android NDK
   
   
   iOS
   
   
   macOS
   
   
   watchOS
   
   
   tvOS
   
   
   Linux
   
   
   Windows
   Mobile App
   

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5. Kotlin Dev Day @marcoGomier
   New Project
   

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6. Kotlin Dev Day - @marcoGomier
   New Projects: Android Studio plugin
   

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7. Kotlin Dev Day - @marcoGomier
   Kotlin Dev Day - @marcoGomier
   .
   
   
   └── kmm-project
   
   
   ├── androidApp
   
   
   ├── iosApp
   
   
   └── shared
   Same Repository
   

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8. Kotlin Dev Day - @marcoGomier
   shared
   androidApp
   Gradle Module
   Android
   

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9. Kotlin Dev Day - @marcoGomier
   //
   settings.gradle.kts
   
   
   include(":shared")
   
   
   //
   build.gradle.kts
   
   
   implementation(project(":shared"))
   Android
   

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10. Kotlin Dev Day - @marcoGomier
    shared
    androidApp iosApp
    Gradle Module Framework
    iOS
    

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11. Kotlin Dev Day - @marcoGomier
    New Projects: Android Studio plugin
    

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12. Kotlin Dev Day - @marcoGomier
    embedAndSignAppleFrameworkForXcode
    https://blog.jetbrains.com/kotlin/2021/07/multiplatform-gradle-plugin-improved-for-connecting-kmm-modules/
    Regular Framework
    

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13. Kotlin Dev Day - @marcoGomier
    CocoaPods dependency manager
    https://kotlinlang.org/docs/reference/native/cocoapods.html
    Pod
    ::
    Spec.new do |spec|
    
    
    spec.name = 'shared'
    
    
    spec.version = '1.0-SNAPSHOT'
    
    
    spec.homepage = 'Link to a Kotlin/Native module homepage'
    
    
    spec.source = { :git
    =>
    "Not Published", :tag
    =
    >
    "Cocoapods/
    #{
    spec.name}
    #{
    
    spec.authors = ''
    
    
    spec.license = ''
    
    
    spec.summary = 'Some description for a Kotlin/Native module'
    
    
    spec.static_framework = true
    
    
    spec.vendored_frameworks = "build/cocoapods/framework/shared.framework"
    
    
    spec.libraries = "c
    ++
    "
    
    
    spec.module_name = "
    # {
    spec.name}_umbrella"
    
    
    spec.pod_target_xcconfig = {
    
    
    'KOTLIN_TARGET[sdk=iphonesimulator*]'
    =>
    'ios_x64',
    
    
    'KOTLIN_TARGET[sdk=iphoneos*]'
    =>
    'ios_arm',
    
    
    'KOTLIN_TARGET[sdk=watchsimulator*]'
    =>
    'watchos_x86',
    
    
    'KOTLIN_TARGET[sdk=watchos*]'
    =>
    'watchos_arm',
    
    
    'KOTLIN_TARGET[sdk=appletvsimulator*]'
    = >
    'tvos_x64',
    
    
    'KOTLIN_TARGET[sdk=appletvos*]'
    =>
    'tvos_arm64',
    
    
    'KOTLIN_TARGET[sdk=macosx*]'
    = >
    'macos_x64'
    
    
    }
    
    
    spec.script_phases = [
    
    
    {
    
    
    :name
    = >
    'Build shared',
    
    
    :execution_position
    = >
    :before_compile,
    
    
    :shell_path
    =>
    '/bin/sh',
    
    
    :script
    => < SCRIPT
    
    
    set -ev
    
    
    REPO_ROOT="$PODS_TARGET_SRCROOT"
    
    
    "$REPO_ROOT/
    ..
    /gradlew" -p "$REPO_ROOT" :shared:syncFramework \
    
    
    -Pkotlin.native.cocoapods.target=$KOTLIN_TARGET \
    
    
    -Pkotlin.native.cocoapods.configuration=$CONFIGURATION \
    
    
    -Pkotlin.native.cocoapods.cflags="$OTHER_CFLAGS" \
    
    
    -Pkotlin.native.cocoapods.paths.headers="$HEADER_SEARCH_PATHS" \
    
    
    -Pkotlin.native.cocoapods.paths.frameworks="$FRAMEWORK_SEARCH_PATHS"
    
    
    SCRIPT
    
    
    }
    
    
    ]
    
    
    end
    

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14. Kotlin Dev Day - @marcoGomier
    iOS Project: Podfile
    pod 'shared', :path
    =>
    '
    ..
    /shared'
    

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15. Kotlin Dev Day @marcoGomier
    Existing Project
    

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16. Kotlin Dev Day - @marcoGomier
    Photo by Ashkan Forouzani on Unsplash
    
    
    🙅
    shared
    androidApp iosApp
    Gradle
    Module
    Framework
    Same Repository
    

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17. Kotlin Dev Day - @marcoGomier
    Photo by Erwan Hesry on Unsplash
    💡 Create a library!
    

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18. Kotlin Dev Day - @marcoGomier
    • Boring code to write multiple times
    
    
    • Code/feature that centralises the source of truth (i.e. a field
    is nullable or not)
    
    
    • Code/feature that can be gradually extracted
    Where to start?
    

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19. Kotlin Dev Day - @marcoGomier
    • DTOs
    
    
    • Common Models
    
    
    • Utility methods, aka `object Utils {}`
    
    
    • Analytics
    
    
    •
    . . .
    Where to start?
    

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20. Kotlin Dev Day - @marcoGomier
    Existing Projects:
    
    
    Intellij Wizard or Android Studio plugin
    

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21. Kotlin Dev Day - @marcoGomier
    Common Kotlin
    Android App iOs App
    .aar Framework
    

    Maven
    

    Cocoa Repo
    

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22. Kotlin Dev Day - @marcoGomier
    Common Kotlin
    Android App iOs App
    .aar Framework
    

    Maven
    

    Cocoa Repo
    Android App Repository
    KMP Repository
    iOs App Repository
    

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23. Kotlin Dev Day @marcoGomier
    How to publish: Android
    

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24. Kotlin Dev Day - @marcoGomier
    plugins {
    
    
    //..
    .
    
    id("maven-publish")
    
    
    }
    
    
    group = "com.prof18.hn.foundation"
    
    
    version = "1.0"
    
    
    publishing {
    
    
    repositories {
    
    
    maven{
    
    
    credentials {
    
    
    username = "username"
    
    
    password = "pwd"
    
    
    }
    
    
    url = url("https:
    //
    mymavenrepo.it")
    
    
    }
    
    
    }
    
    
    }
    
    
    Setup a Maven repository to share the artifacts: build.gradle.kts
    

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25. Kotlin Dev Day - @marcoGomier
    Publish the artifacts
    ./gradlew publish
    
    
    

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26. Kotlin Dev Day - @marcoGomier
    Publish the artifacts
    ./gradlew publish
    
    
    ./gradlew publishToMavenLocal
    
    
    

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27. Kotlin Dev Day - @marcoGomier
    Android
    implementation(“com.prof18.hn.foundation:hn-foundation-android:2.0.0")
    
    
    

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28. Kotlin Dev Day @marcoGomier
    How to publish: iOS
    

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29. Kotlin Dev Day - @marcoGomier
    ❌ Regular Framework
    ❌ CocoaPods dependency manager
    

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30. Kotlin Dev Day - @marcoGomier
    XCFramework
    

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31. Kotlin Dev Day - @marcoGomier
    NEW
    https://developer.apple.com/videos/play/wwdc2019/416/
    NEW
    iOS mac
    OS
    watch
    OS
    tvOS
    

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32. Kotlin Dev Day - @marcoGomier
    XCFramework
    Official Support from Kotlin 1.5.30
    https://kotlinlang.org/docs/whatsnew1530.html#support-for-xcframeworks
    

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33. XCFramework prior to Kotlin 1.5.30
    https://github.com/prof18/kmp-xcframework-sample/blob/pre-kotlin-1.5.30/build.gradle.kts#L86
    register("buildReleaseXCFramework", Exec
    ::
    class.java) {
    
    
    description = "Create a Release XCFramework"
    
    
    dependsOn("link${libName}ReleaseFrameworkIosArm64")
    
    
    dependsOn("link${libName}ReleaseFrameworkIosX64")
    
    
    val arm64FrameworkPath = "$rootDir/build/bin/iosArm64/${libName}ReleaseFramework/${libName}.framework"
    
    
    val arm64DebugSymbolsPath =
    
    
    "$rootDir/build/bin/iosArm64/${libName}ReleaseFramework/${libName}.framework.dSYM"
    
    
    val x64FrameworkPath = "$rootDir/build/bin/iosX64/${libName}ReleaseFramework/${libName}.framework"
    
    
    val x64DebugSymbolsPath = "$rootDir/build/bin/iosX64/${libName}ReleaseFramework/${libName}.framework.dSYM"
    
    
    val xcFrameworkDest = File("$rootDir/
    ..
    /kmp-xcframework-dest/$libName.xcframework")
    
    
    executable = "xcodebuild"
    
    
    args(mutableListOf().apply {
    
    
    add("-create-xcframework")
    
    
    add("-output")
    
    
    add(xcFrameworkDest.path)
    
    
    //
    Real Device
    
    
    add("-framework")
    
    
    add(arm64FrameworkPath)
    
    
    add("-debug-symbols")
    
    
    add(arm64DebugSymbolsPath)
    
    
    //
    Simulator
    
    
    add("-framework")
    
    
    add(x64FrameworkPath)
    
    
    add("-debug-symbols")
    
    
    add(x64DebugSymbolsPath)
    
    
    })
    
    
    doFirst {
    
    
    xcFrameworkDest.deleteRecursively()
    
    
    }
    
    
    }
    

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34. Kotlin Dev Day - @marcoGomier
    XCFramework prior to Kotlin 1.5.30
    https:
    /
    /
    www.marcogomiero.com/posts/2021/build-xcframework-kmp/
    

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35. Kotlin Dev Day - @marcoGomier
    XCFramework: build.gradle.kts
    https://github.com/prof18/shared-hn-android-ios-backend/blob/main/hn-foundation/build.gradle.kts
    import org.jetbrains.kotlin.gradle.plugin.mpp.apple.XCFramework
    
    
    val libName = "LibraryName"
    
    
    kotlin {
    
    
    val xcFramework = XCFramework(libName)
    
    
    ios {
    
    
    binaries.framework(libName) {
    
    
    xcFramework.add(this)
    
    
    }
    
    
    }
    
    
    ...
    
    }
    

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36. Kotlin Dev Day - @marcoGomier
    XCFramework: build.gradle.kts
    https://github.com/prof18/shared-hn-android-ios-backend/blob/main/hn-foundation/build.gradle.kts
    import org.jetbrains.kotlin.gradle.plugin.mpp.apple.XCFramework
    
    
    val libName = "LibraryName"
    
    
    kotlin {
    
    
    val xcFramework = XCFramework(libName)
    
    
    ios {
    
    
    binaries.framework(libName) {
    
    
    xcFramework.add(this)
    
    
    }
    
    
    }
    
    
    ...
    
    }
    

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37. Kotlin Dev Day - @marcoGomier
    XCFramework: build.gradle.kts
    https://github.com/prof18/shared-hn-android-ios-backend/blob/main/hn-foundation/build.gradle.kts
    import org.jetbrains.kotlin.gradle.plugin.mpp.apple.XCFramework
    
    
    val libName = "LibraryName"
    
    
    kotlin {
    
    
    val xcFramework = XCFramework(libName)
    
    
    ios {
    
    
    binaries.framework(libName) {
    
    
    xcFramework.add(this)
    
    
    }
    
    
    }
    
    
    ...
    
    }
    

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38. Kotlin Dev Day - @marcoGomier
    XCFramework: build.gradle.kts
    https://github.com/prof18/shared-hn-android-ios-backend/blob/main/hn-foundation/build.gradle.kts
    import org.jetbrains.kotlin.gradle.plugin.mpp.apple.XCFramework
    
    
    val libName = "LibraryName"
    
    
    kotlin {
    
    
    val xcFramework = XCFramework(libName)
    
    
    ios {
    
    
    binaries.framework(libName) {
    
    
    xcFramework.add(this)
    
    
    }
    
    
    }
    
    
    ...
    
    }
    

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39. Kotlin Dev Day - @marcoGomier
    assemble${libName}XCFramework
    
    
    assemble${libName}DebugXCFramework
    
    
    assemble${libName}ReleaseXCFramework
    XCFramework: Gradle tasks
    

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40. Kotlin Dev Day - @marcoGomier
    .
    
    
    ├── build
    
    
    ├── XCFrameworks
    
    
    ├── debug
    
    
    │ └── LibraryName.xcframework
    
    
    └── release
    
    
    └── LibraryName.xcframework
    
    
    XCFramework
    

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41. Kotlin Dev Day - @marcoGomier https://github.com/prof18/hn-foundation-cocoa-xcframework
    CocoaPod Repository
    https://guides.cocoapods.org/making/private-cocoapods.html
    

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42. Kotlin Dev Day - @marcoGomier
    iOs Project: Podfile
    # For develop releases:
    
    
    pod 'HNFoundation', :git
    =>
    “git@github.com:prof18/hn-foundation-cocoa-xcframework.git", :branch
    =
    >
    'develop'
    
    
    # For stable releases
    
    
    pod 'HNFoundation', :git
    =>
    “git@github.com:prof18/hn-foundation-cocoa-xcframework.git", :tag
    =>
    ‘2.0.0'
    
    
    

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43. register("publishDevFramework") {
    
    
    description = "Publish iOs framework to the Cocoa Repo"
    
    
    doFirst {
    
    
    project.exec {
    
    
    workingDir = File("$rootDir/
    ..
    /
    ..
    /hn-foundation-cocoa-xcframework")
    
    
    commandLine("git", "checkout", "develop").standardOutput
    
    
    }
    
    
    }
    
    
    dependsOn("assemble${libName}DebugXCFramework")
    
    
    doLast {
    
    
    copy {
    
    
    from("$buildDir/XCFrameworks/debug")
    
    
    into("$rootDir/
    ..
    /
    ..
    /hn-foundation-cocoa-xcframework")
    
    
    }
    
    .. ..
    
    https://github.com/prof18/shared-hn-android-ios-backend/blob/main/hn-foundation/build.gradle.kts#L110
    Publish Dev Framework Task
    

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44. Kotlin Dev Day - @marcoGomier
    
    
    workingDir = File("$rootDir/
    ..
    /
    ..
    /hn-foundation-cocoa-xcframework")
    
    
    commandLine("git", "checkout", "develop").standardOutput
    
    
    }
    
    
    }
    
    
    dependsOn("assemble${libName}DebugXCFramework")
    
    
    doLast {
    
    
    copy {
    
    
    from("$buildDir/XCFrameworks/debug")
    
    
    into("$rootDir/
    ..
    /
    ..
    /hn-foundation-cocoa-xcframework")
    
    
    }
    
    
    val dir = File("$rootDir/
    ..
    /
    ..
    /hn-foundation-cocoa-xcframework/$libName.podspec")
    
    
    val tempFile = File("$rootDir/
    ..
    /
    ..
    /hn-foundation-cocoa-xcframework/$libName.podspec.new")
    
    
    val reader = dir.bufferedReader()
    
    
    val writer = tempFile.bufferedWriter()
    
    
    var currentLine: String?
    
    
    while (reader.readLine().also { currLine
    ->
    currentLine = currLine }
    !=
    null) {
    
    
    if (currentLine
    ?.
    startsWith("s.version")
    ==
    true) {
    
    
    writer.write("s.version = \"${libVersionName}\"" + System.lineSeparator())
    
    
    

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45. Kotlin Dev Day - @marcoGomier
    into("$rootDir/
    ..
    /
    ..
    /hn-foundation-cocoa-xcframework")
    
    
    }
    
    
    val dir = File("$rootDir/
    ..
    /
    ..
    /hn-foundation-cocoa-xcframework/$libName.podspec")
    
    
    val tempFile = File("$rootDir/
    ..
    /
    ..
    /hn-foundation-cocoa-xcframework/$libName.podspec.new")
    
    
    val reader = dir.bufferedReader()
    
    
    val writer = tempFile.bufferedWriter()
    
    
    var currentLine: String?
    
    
    while (reader.readLine().also { currLine
    ->
    currentLine = currLine }
    !=
    null) {
    
    
    if (currentLine
    ?.
    startsWith("s.version")
    ==
    true) {
    
    
    writer.write("s.version = \"${libVersionName}\"" + System.lineSeparator())
    
    
    } else {
    
    
    writer.write(currentLine + System.lineSeparator())
    
    
    }
    
    
    }
    
    
    writer.close()
    
    
    reader.close()
    
    
    val successful = tempFile.renameTo(dir)
    
    
    if (successful) {
    
    
    project.exec {
    
    
    workingDir = File("$rootDir/
    ..
    /
    ..
    /hn-foundation-cocoa-xcframework")
    
    
    

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46. Kotlin Dev Day - @marcoGomier
    if (successful) {
    
    
    project.exec {
    
    
    workingDir = File("$rootDir/
    ..
    /
    ..
    /hn-foundation-cocoa-xcframework")
    
    
    commandLine("git", "add", ".").standardOutput
    
    
    }
    
    
    val dateFormatter = SimpleDateFormat("dd/MM/yyyy - HH:mm", Locale.getDefault())
    
    
    project.exec {
    
    
    workingDir = File("$rootDir/
    ..
    /
    ..
    /hn-foundation-cocoa-xcframework")
    
    
    commandLine(
    
    
    "git",
    
    
    "commit",
    
    
    "-m",
    
    
    "\"New dev release: ${libVersionName}-${dateFormatter.format(Date())}\""
    
    
    ).standardOutput
    
    
    }
    
    
    project.exec {
    
    
    workingDir = File("$rootDir/
    ..
    /
    ..
    /hn-foundation-cocoa-xcframework")
    
    
    commandLine("git", "push", "origin", "develop").standardOutput
    
    
    }
    
    
    }
    
    
    
    
    

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47. https://github.com/prof18/shared-hn-android-ios-backend/blob/main/hn-foundation/build.gradle.kts#L177
    Publish Release Framework Task
    register("publishFramework") {
    
    
    description = "Publish iOs framework to the Cocoa Repo"
    
    
    doFirst {
    
    
    project.exec {
    
    
    workingDir = File("$rootDir/
    ..
    /
    ..
    /hn-foundation-cocoa-xcframework")
    
    
    commandLine("git", "checkout", "main").standardOutput
    
    
    }
    
    
    }
    
    
    dependsOn("assemble${libName}ReleaseXCFramework")
    
    
    doLast {
    
    
    copy {
    
    
    from("$buildDir/XCFrameworks/release")
    
    
    into("$rootDir/
    ..
    /
    ..
    /hn-foundation-cocoa-xcframework")
    
    
    }
    
    .. ..
    
    

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48. Kotlin Dev Day - @marcoGomier
    project.exec {
    
    
    workingDir = File("$rootDir/
    ..
    /
    ..
    /hn-foundation-cocoa-xcframework")
    
    
    commandLine("git", "checkout", "main").standardOutput
    
    
    }
    
    
    }
    
    
    dependsOn("assemble${libName}ReleaseXCFramework")
    
    
    doLast {
    
    
    copy {
    
    
    from("$buildDir/XCFrameworks/release")
    
    
    into("$rootDir/
    ..
    /
    ..
    /hn-foundation-cocoa-xcframework")
    
    
    }
    
    
    val dir = File("$rootDir/
    ..
    /
    ..
    /hn-foundation-cocoa-xcframework/$libName.podspec")
    
    
    val tempFile = File("$rootDir/
    ..
    /
    ..
    /hn-foundation-cocoa-xcframework/$libName.podspec.new")
    
    
    val reader = dir.bufferedReader()
    
    
    val writer = tempFile.bufferedWriter()
    
    
    var currentLine: String?
    
    
    while (reader.readLine().also { currLine
    ->
    currentLine = currLine }
    !=
    null) {
    
    
    if (currentLine
    ?.
    startsWith("s.version")
    ==
    true) {
    
    
    
    

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49. Kotlin Dev Day - @marcoGomier
    project.exec {
    
    
    workingDir = File("$rootDir/
    ..
    /
    ..
    /hn-foundation-cocoa-xcframework")
    
    
    commandLine("git", "add", ".").standardOutput
    
    
    }
    
    
    project.exec {
    
    
    workingDir = File("$rootDir/
    ..
    /
    ..
    /hn-foundation-cocoa-xcframework")
    
    
    commandLine("git", "commit", "-m", "\"New release: ${libVersionName}\"").standardOu
    
    
    }
    
    
    project.exec {
    
    
    workingDir = File("$rootDir/
    ..
    /
    ..
    /hn-foundation-cocoa-xcframework")
    
    
    commandLine("git", "tag", libVersionName).standardOutput
    
    
    }
    
    
    project.exec {
    
    
    workingDir = File("$rootDir/
    ..
    /
    ..
    /hn-foundation-cocoa-xcframework")
    
    
    commandLine("git", "push", "origin", "main", "
    --
    tags").standardOutput
    
    
    }
    
    
    }
    
    
    }
    
    
    }
    
    
    

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50. Kotlin Dev Day - @marcoGomier
    🎉
    

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51. Kotlin Dev Day @marcoGomier
    Conclusions
    

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52. Kotlin Dev Day - @marcoGomier
    Faced [and resolved] difficulties
    • How to organise the project without a monorepo
    
    
    • How to effectively distribute the iOS framework
    

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53. Kotlin Dev Day - @marcoGomier
    Start little
    

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54. Kotlin Dev Day - @marcoGomier
    Start little
    Go bigger
    then
    

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55. Kotlin Dev Day - @marcoGomier
    Start little then go bigger
    • Validate the process with “little” effort
    
    
    • Then you can go bigger and share more “features”
    

    

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56. Kotlin Dev Day - @marcoGomier https://github.com/prof18/shared-hn-android-ios-backend
    * based on a true story project
    

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57. Bibliography / Useful Links
    • https:
    //
    kotlinlang.org/lp/mobile/
    
    
    • https:
    //
    www.marcogomiero.com/posts/2020/my-2cents-cross-platform/
    
    
    • https:
    //
    giansegato.com/essays/a-technical-framework-for-early-stage-startups/
    
    
    • https:
    //
    giansegato.com/essays/the-ebb-and-the-flow-of-product-development/
    
    
    • https:
    //
    www.marcogomiero.com/posts/2021/build-xcframework-kmp/
    
    
    • https:
    //
    www.marcogomiero.com/posts/2021/kmp-xcframework-official-support/
    
    
    • https:
    //
    www.marcogomiero.com/posts/2020/kotlin-serialization-alamofire/
    
    
    • https:
    //
    www.marcogomiero.com/posts/2021/kmp-existing-project/
    
    
    • https:
    //
    developer.apple.com/videos/play/wwdc2019/416/
    
    
    • https:
    //
    guides.cocoapods.org/making/private-cocoapods.html
    
    
    

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58. @marcoGomier
    Kotlin Dev Day
    Thank you!
    
    
    > Twitter: @marcoGomier
    

    > Github: prof18
    

    > Website: marcogomiero.com
    Marco Gomiero
    👨💻 Senior Android Engineer @ TIER
    

    Google Developer Expert for Kotlin
    

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