Kotlin goes global

Exploring Kotlin Multiplatform, what it is, and how its different

Transcript

1. KOTLIN GOES GLOBAL Exploring Kotlin Multiplatform, What It Is, And How Its Different - By Karan Dhillon, 28th Feb 2021
2. About Me, I... • live in Toronto, ON • have been doing android development for the past 4 years • currently working at Homestars Inc. but moving on to Hootsuite Inc. soon • love working with Kotlin
3. Visit The Past
4. The Good, The Bad, And The Ugly • Time saved due to code sharing. • Avoid developer frustration when it comes to IDEs, SDKs, and platform specific requirements. • Third party integration would be ‘lighter’. • Bug tracking is easier as codebase is shared. • Hybrid apps get build faster. • Faster initial speed to market. • Fast deploy of updates. • Less secure compared to native. • Distribution platforms allow more visibility to native apps. • Total dependence on the framework forces you to develop features to cater the framework’s needs.
5. The Question Remains Why Is JetBrains Jumping Into The World Of Hybrid Frameworks As Well?
6. Kotlin, a JVM based language, is very rapidly being adopted by the android community. Based on the demographic android covers, Kotlin would be an easy candidate for a hybrid framework.
7. “Kotlin Multiplatform Mobile (KMM) is an SDK for cross-platform mobile development provided by JetBrains. It uses the multiplatform capabilities of Kotlin and includes various tools and features designed to make the end-to-end experience of building mobile cross-platform applications as enjoyable and efficient as possible.”
12. //Common expect fun randomUUID(): String
13. //Common expect fun randomUUID(): String
14. //Common expect fun randomUUID(): String //Android import java.util.* actual fun randomUUID() = UUID.randomUUID().toString() //iOS import platform.Foundation.NSUUID actual fun randomUUID(): String = NSUUID().UUIDString()
15. //iOS import platform.Foundation.NSUUID actual fun randomUUID(): String = NSUUID().UUIDString() //Android import java.util.* actual fun randomUUID() = UUID.randomUUID().toString() //Common expect fun randomUUID(): String
16. commonMain directory will hold the business logic that will be shared among all the platforms shared module will hold the shared business logic. This logic can be further dissected into platform specific directories androidMain & iosMain directories will hold the business logic that will be shared among the respective platform’s feature module
17. iOSTest directory will hold the business logic that can be reached by iOS module Compose-desktop module will hold the implementation logic for desktop support
18. KMM project requirements • Android studio, version 4.2 or higher • If iOS specific-code needs to be written, then Xcode version 11.3 or higher • Compatible Kotlin compiler plugin • Kotlin Multiplatform Mobile plugin • JDK
19. Demo - SpaceX
22. commonMain directory will hold the business logic that will be shared among all the platforms shared module will hold the shared business logic. This logic can be further dissected into platform specific directories androidMain & iosMain directories will hold the business logic that will be shared among the respective platform’s feature module
23. plugins { kotlin("multiplatform") id("com.android.library") } kotlin { val coroutinesVersion = "1.3.9-native-mt" sourceSets { val commonMain by getting { dependencies { implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:$coroutinesVersion") } } } } Build.gradle.kts (shared)
24. plugins { kotlin("multiplatform") id("com.android.library") } kotlin { val coroutinesVersion = "1.3.9-native-mt" sourceSets { val commonMain by getting { dependencies { implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:$coroutinesVersion") } } } } Build.gradle.kts (shared)
25. buildscript { repositories { gradlePluginPortal() jcenter() google() mavenCentral() } dependencies { classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:1.4.10") classpath("com.android.tools.build:gradle:4.0.1") classpath("org.jetbrains.kotlin:kotlin-serialization:1.4.10") } } allprojects { repositories { google() jcenter() mavenCentral() } } Build.gradle.kts (root)
26. buildscript { repositories { gradlePluginPortal() jcenter() google() mavenCentral() } dependencies { classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:1.4.10") classpath("com.android.tools.build:gradle:4.0.1") classpath("org.jetbrains.kotlin:kotlin-serialization:1.4.10") } } allprojects { repositories { google() jcenter() mavenCentral() } } Build.gradle.kts (root)
27. plugins { kotlin("multiplatform") id("com.android.library") kotlin("plugin.serialization") } kotlin { val coroutinesVersion = "1.3.9-native-mt" val serializationVersion = "1.0.0-RC" sourceSets { val commonMain by getting { dependencies { implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:$coroutinesVersion") implementation("org.jetbrains.kotlinx:kotlinx-serialization-core:$serializationVersion") } } } } Build.gradle.kts (shared)
28. plugins { kotlin("multiplatform") id("com.android.library") kotlin("plugin.serialization") } kotlin { val coroutinesVersion = "1.3.9-native-mt" val serializationVersion = "1.0.0-RC" sourceSets { val commonMain by getting { dependencies { implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:$coroutinesVersion") implementation("org.jetbrains.kotlinx:kotlinx-serialization-core:$serializationVersion") } } } } Build.gradle.kts (shared)
29. plugins { kotlin("multiplatform") id("com.android.library") kotlin("plugin.serialization") } kotlin { val coroutinesVersion = "1.3.9-native-mt" val serializationVersion = "1.0.0-RC" sourceSets { val commonMain by getting { dependencies { implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:$coroutinesVersion") implementation("org.jetbrains.kotlinx:kotlinx-serialization-core:$serializationVersion") } } } } Build.gradle.kts (shared) kotlin { val coroutinesVersion = "1.3.9-native-mt" val serializationVersion = "1.0.0-RC" sourceSets { val commonMain by getting { dependencies { implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:$coroutinesVersion") implementation("org.jetbrains.kotlinx:kotlinx-serialization-core:$serializationVersion") } } } }
30. Build.gradle.kts (shared) kotlin { val coroutinesVersion = "1.3.9-native-mt" val serializationVersion = "1.0.0-RC" val ktorVersion = "1.4.0" sourceSets { val commonMain by getting { dependencies { implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:$coroutinesVersion") implementation("org.jetbrains.kotlinx:kotlinx-serialization-core:$serializationVersion") implementation("io.ktor:ktor-client-core:$ktorVersion") implementation("io.ktor:ktor-client-serialization:$ktorVersion") } } val androidMain by getting { dependencies { implementation("io.ktor:ktor-client-android:$ktorVersion") } } val iosMain by getting { dependencies { implementation("io.ktor:ktor-client-ios:$ktorVersion") } } } }
31. kotlin { val coroutinesVersion = "1.3.9-native-mt" val serializationVersion = "1.0.0-RC" val ktorVersion = "1.4.0" sourceSets { val commonMain by getting { dependencies { implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:$coroutinesVersion") implementation("org.jetbrains.kotlinx:kotlinx-serialization-core:$serializationVersion") implementation("io.ktor:ktor-client-core:$ktorVersion") implementation("io.ktor:ktor-client-serialization:$ktorVersion") } } val androidMain by getting { dependencies { implementation("io.ktor:ktor-client-android:$ktorVersion") } } val iosMain by getting { dependencies { implementation("io.ktor:ktor-client-ios:$ktorVersion") } } } } Build.gradle.kts (shared)
32. kotlin.code.style=official xcodeproj=./iosApp android.useAndroidX=true kotlin.mpp.enableGranularSourceSetsMetadata=true kotlin.native.enableDependencyPropagation=false sqlDelightVersion=1.4.2 gradle.properties
33. kotlin.code.style=official xcodeproj=./iosApp android.useAndroidX=true kotlin.mpp.enableGranularSourceSetsMetadata=true kotlin.native.enableDependencyPropagation=false sqlDelightVersion=1.4.2 gradle.properties
34. buildscript { repositories { gradlePluginPortal() jcenter() google() mavenCentral() } val sqlDelightVersion: String by project dependencies { classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:1.4.10") classpath("com.android.tools.build:gradle:4.0.1") classpath("org.jetbrains.kotlin:kotlin-serialization:1.4.10") classpath("com.squareup.sqldelight:gradle-plugin:$sqlDelightVersion") } } allprojects { repositories { google() jcenter() mavenCentral() } } Build.gradle.kts (root)
35. buildscript { repositories { gradlePluginPortal() jcenter() google() mavenCentral() } val sqlDelightVersion: String by project dependencies { classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:1.4.10") classpath("com.android.tools.build:gradle:4.0.1") classpath("org.jetbrains.kotlin:kotlin-serialization:1.4.10") classpath("com.squareup.sqldelight:gradle-plugin:$sqlDelightVersion") } } allprojects { repositories { google() jcenter() mavenCentral() } } Build.gradle.kts (root)
36. Build.gradle.kts (shared) plugins { id("com.squareup.sqldelight") } kotlin { val sqlDelightVersion: String by project sourceSets { val commonMain by getting { dependencies { implementation("com.squareup.sqldelight:runtime:$sqlDelightVersion") } } val androidMain by getting { dependencies { implementation("com.squareup.sqldelight:android-driver:$sqlDelightVersion") } } val iosMain by getting { dependencies { implementation("com.squareup.sqldelight:native-driver:$sqlDelightVersion") } } } }
37. plugins { id("com.squareup.sqldelight") } kotlin { val sqlDelightVersion: String by project sourceSets { val commonMain by getting { dependencies { implementation("com.squareup.sqldelight:runtime:$sqlDelightVersion") } } val androidMain by getting { dependencies { implementation("com.squareup.sqldelight:android-driver:$sqlDelightVersion") } } val iosMain by getting { dependencies { implementation("com.squareup.sqldelight:native-driver:$sqlDelightVersion") } } } } Build.gradle.kts (shared)
38. Entity.kt(com.kdhillon.spacex.shared.entity) @Serializable data class RocketLaunch( @SerialName("flight_number") val flightNumber: Int, @SerialName("mission_name") val missionName: String, @SerialName("launch_year") val launchYear: Int, @SerialName("launch_date_utc") val launchDateUTC: String, @SerialName("rocket") val rocket: Rocket, @SerialName("details") val details: String?, @SerialName("launch_success") val launchSuccess: Boolean?, @SerialName("links") val links: Links ) @Serializable data class Rocket( @SerialName("rocket_id") val id: String, @SerialName("rocket_name") val name: String, @SerialName("rocket_type") val type: String ) @Serializable data class Links( @SerialName("mission_patch") val missionPatchUrl: String?, @SerialName("article_link") val articleUrl: String? )
39. @Serializable data class RocketLaunch( @SerialName("flight_number") val flightNumber: Int, @SerialName("mission_name") val missionName: String, @SerialName("launch_year") val launchYear: Int, @SerialName("launch_date_utc") val launchDateUTC: String, @SerialName("rocket") val rocket: Rocket, @SerialName("details") val details: String?, @SerialName("launch_success") val launchSuccess: Boolean?, @SerialName("links") val links: Links ) @Serializable data class Rocket( @SerialName("rocket_id") val id: String, @SerialName("rocket_name") val name: String, @SerialName("rocket_type") val type: String ) @Serializable data class Links( @SerialName("mission_patch") val missionPatchUrl: String?, @SerialName("article_link") val articleUrl: String? ) Entity.kt(com.kdhillon.spacex.shared.entity)
40. Build.gradle.kts (shared) plugins { // ... } kotlin { // ... } sqldelight { database("AppDatabase") { // The packageName parameter specifies the package name for the generated Kotlin sources. packageName = "com.kdhillon.spacex.shared.cache" } }
41. plugins { // ... } kotlin { // ... } sqldelight { database("AppDatabase") { // The packageName parameter specifies the package name for the generated Kotlin sources. packageName = "com.kdhillon.spacex.shared.cache" } } Build.gradle.kts (shared)
42. First we need to create .sq file, which will contain all the SQL queries. By default, SQLDelight plugin reads .sq from the sqldelight folder. So create the package specified in the packageName parameter.
43. Inside our package, we need to create a .sq file with the name of our database (in our case, AppDatabase.sq)
44. AppDatabase.sq CREATE TABLE Launch ( flightNumber INTEGER NOT NULL, missionName TEXT NOT NULL, launchYear INTEGER AS Int NOT NULL DEFAULT 0, rocketId TEXT NOT NULL, details TEXT, launchSuccess INTEGER AS Boolean DEFAULT NULL, launchDateUTC TEXT NOT NULL, missionPatchUrl TEXT, articleUrl TEXT ); CREATE TABLE Rocket ( id TEXT NOT NULL PRIMARY KEY, name TEXT NOT NULL, type TEXT NOT NULL );
45. CREATE TABLE Launch ( flightNumber INTEGER NOT NULL, missionName TEXT NOT NULL, launchYear INTEGER AS Int NOT NULL DEFAULT 0, rocketId TEXT NOT NULL, details TEXT, launchSuccess INTEGER AS Boolean DEFAULT NULL, launchDateUTC TEXT NOT NULL, missionPatchUrl TEXT, articleUrl TEXT ); CREATE TABLE Rocket ( id TEXT NOT NULL PRIMARY KEY, name TEXT NOT NULL, type TEXT NOT NULL ); AppDatabase.sq
46. AppDatabase.sq CREATE TABLE Launch ( flightNumber INTEGER NOT NULL, missionName TEXT NOT NULL, launchYear INTEGER AS Int NOT NULL DEFAULT 0, rocketId TEXT NOT NULL, details TEXT, launchSuccess INTEGER AS Boolean DEFAULT NULL, launchDateUTC TEXT NOT NULL, missionPatchUrl TEXT, articleUrl TEXT ); CREATE TABLE Rocket ( id TEXT NOT NULL PRIMARY KEY, name TEXT NOT NULL, type TEXT NOT NULL );
47. insertLaunch: INSERT INTO Launch(flightNumber, missionName, launchYear, rocketId, details, launchSuccess, launchDateUTC, missionPatchUrl, articleUrl) VALUES(?, ?, ?, ?, ?, ?, ?, ?, ?); insertRocket: INSERT INTO Rocket(id, name, type) VALUES(?, ?, ?); AppDatabase.sq
48. insertLaunch: INSERT INTO Launch(flightNumber, missionName, launchYear, rocketId, details, launchSuccess, launchDateUTC, missionPatchUrl, articleUrl) VALUES(?, ?, ?, ?, ?, ?, ?, ?, ?); insertRocket: INSERT INTO Rocket(id, name, type) VALUES(?, ?, ?); AppDatabase.sq
49. insertLaunch: INSERT INTO Launch(flightNumber, missionName, launchYear, rocketId, details, launchSuccess, launchDateUTC, missionPatchUrl, articleUrl) VALUES(?, ?, ?, ?, ?, ?, ?, ?, ?); insertRocket: INSERT INTO Rocket(id, name, type) VALUES(?, ?, ?); AppDatabase.sq
50. removeAllLaunches: DELETE FROM Launch; removeAllRockets: DELETE FROM Rocket; AppDatabase.sq
51. removeAllLaunches: DELETE FROM Launch; removeAllRockets: DELETE FROM Rocket; AppDatabase.sq
52. removeAllLaunches: DELETE FROM Launch; removeAllRockets: DELETE FROM Rocket; AppDatabase.sq
53. selectRocketById: SELECT * FROM Rocket WHERE id = ?; selectAllLaunchesInfo: SELECT Launch.*, Rocket.* FROM Launch LEFT JOIN Rocket ON Rocket.id == Launch.rocketId; AppDatabase.sq
54. selectRocketById: SELECT * FROM Rocket WHERE id = ?; selectAllLaunchesInfo: SELECT Launch.*, Rocket.* FROM Launch LEFT JOIN Rocket ON Rocket.id == Launch.rocketId; AppDatabase.sq
55. selectRocketById: SELECT * FROM Rocket WHERE id = ?; selectAllLaunchesInfo: SELECT Launch.*, Rocket.* FROM Launch LEFT JOIN Rocket ON Rocket.id == Launch.rocketId; AppDatabase.sq
56. When the project is compiled, the generated kotlin code will be stored in our packageName directory.
57. interface AppDatabase : Transacter { val appDatabaseQueries: AppDatabaseQueries companion object { val Schema: SqlDriver.Schema get() = AppDatabase::class.schema operator fun invoke(driver: SqlDriver): AppDatabase = AppDatabase::class.newInstance(driver)} } AppDatabase.kt(com.kdhillon.spacex.shared.cache)
58. interface AppDatabase : Transacter { val appDatabaseQueries: AppDatabaseQueries companion object { val Schema: SqlDriver.Schema get() = AppDatabase::class.schema operator fun invoke(driver: SqlDriver): AppDatabase = AppDatabase::class.newInstance(driver)} } AppDatabase.kt(com.kdhillon.spacex.shared.cache)
59. interface AppDatabase : Transacter { val appDatabaseQueries: AppDatabaseQueries companion object { val Schema: SqlDriver.Schema get() = AppDatabase::class.schema operator fun invoke(driver: SqlDriver): AppDatabase = AppDatabase::class.newInstance(driver)} } AppDatabase.kt(com.kdhillon.spacex.shared.cache)
60. interface AppDatabaseQueries : Transacter { fun <T : Any> selectRocketById(id: String, mapper: ( id: String, name: String, type: String ) -> T): Query<T> fun selectRocketById(id: String): Query<Rocket> fun <T : Any> selectAllLaunchesInfo(mapper: ( flightNumber: Long, missionName: String, launchYear: Int, rocketId: String, details: String?, launchSuccess: Boolean?, launchDateUTC: String, missionPatchUrl: String?, articleUrl: String?, id: String?, name: String?, type: String? ) -> T): Query<T> fun selectAllLaunchesInfo(): Query<SelectAllLaunchesInfo> ... AppDatabaseQueries.kt(com.kdhillon.spacex.shared.cache)
61. interface AppDatabaseQueries : Transacter { fun <T : Any> selectRocketById(id: String, mapper: ( id: String, name: String, type: String ) -> T): Query<T> fun selectRocketById(id: String): Query<Rocket> fun <T : Any> selectAllLaunchesInfo(mapper: ( flightNumber: Long, missionName: String, launchYear: Int, rocketId: String, details: String?, launchSuccess: Boolean?, launchDateUTC: String, missionPatchUrl: String?, articleUrl: String?, id: String?, name: String?, type: String? ) -> T): Query<T> fun selectAllLaunchesInfo(): Query<SelectAllLaunchesInfo> ... AppDatabaseQueries.kt(com.kdhillon.spacex.shared.cache)
62. interface AppDatabaseQueries : Transacter { fun <T : Any> selectRocketById(id: String, mapper: ( id: String, name: String, type: String ) -> T): Query<T> fun selectRocketById(id: String): Query<Rocket> fun <T : Any> selectAllLaunchesInfo(mapper: ( flightNumber: Long, missionName: String, launchYear: Int, rocketId: String, details: String?, launchSuccess: Boolean?, launchDateUTC: String, missionPatchUrl: String?, articleUrl: String?, id: String?, name: String?, type: String? ) -> T): Query<T> fun selectAllLaunchesInfo(): Query<SelectAllLaunchesInfo> ... AppDatabaseQueries.kt(com.kdhillon.spacex.shared.cache)
63. interface AppDatabase : Transacter { val appDatabaseQueries: AppDatabaseQueries companion object { val Schema: SqlDriver.Schema get() = AppDatabase::class.schema operator fun invoke(driver: SqlDriver): AppDatabase = AppDatabase::class.newInstance(driver)} } AppDatabase.kt(com.kdhillon.spacex.shared.cache)
64. interface AppDatabase : Transacter { val appDatabaseQueries: AppDatabaseQueries companion object { val Schema: SqlDriver.Schema get() = AppDatabase::class.schema operator fun invoke(driver: SqlDriver): AppDatabase = AppDatabase::class.newInstance(driver)} } AppDatabase.kt(com.kdhillon.spacex.shared.cache)
65. expect class DatabaseDriverFactory { fun createDriver(): SqlDriver } DatabaseDriverFactory.kt(com.kdhillon.spacex.shared.cache)
66. expect class DatabaseDriverFactory { fun createDriver(): SqlDriver } DatabaseDriverFactory.kt(com.kdhillon.spacex.shared.cache)
67. actual class DatabaseDriverFactory(private val context: Context) { actual fun createDriver(): SqlDriver { return AndroidSqliteDriver(AppDatabase.Schema, context, "test.db") } } DatabaseDriverFactory.kt(com.kdhillon.spacex.shared.cache in androidMain)
68. actual class DatabaseDriverFactory(private val context: Context) { actual fun createDriver(): SqlDriver { return AndroidSqliteDriver(AppDatabase.Schema, context, "test.db") } } DatabaseDriverFactory.kt(com.kdhillon.spacex.shared.cache in androidMain)
69. actual class DatabaseDriverFactory { actual fun createDriver(): SqlDriver { return NativeSqliteDriver(AppDatabase.Schema, "test.db") } } DatabaseDriverFactory.kt(com.kdhillon.spacex.shared.cache in iosMain)
70. actual class DatabaseDriverFactory { actual fun createDriver(): SqlDriver { return NativeSqliteDriver(AppDatabase.Schema, "test.db") } } DatabaseDriverFactory.kt(com.kdhillon.spacex.shared.cache in iosMain)
71. actual class DatabaseDriverFactory { actual fun createDriver(): SqlDriver { return NativeSqliteDriver(AppDatabase.Schema, "test.db") } } DatabaseDriverFactory.kt(com.kdhillon.spacex.shared.cache in iosMain)
72. internal class Database(databaseDriverFactory: DatabaseDriverFactory) { private val database = AppDatabase(databaseDriverFactory.createDriver()) private val dbQuery = database.appDatabaseQueries } Database.kt(com.kdhillon.spacex.shared.cache)
73. internal class Database(databaseDriverFactory: DatabaseDriverFactory) { private val database = AppDatabase(databaseDriverFactory.createDriver()) private val dbQuery = database.appDatabaseQueries } Database.kt(com.kdhillon.spacex.shared.cache)
74. internal class Database(databaseDriverFactory: DatabaseDriverFactory) { private val database = AppDatabase(databaseDriverFactory.createDriver()) private val dbQuery = database.appDatabaseQueries } Database.kt(com.kdhillon.spacex.shared.cache) expect class DatabaseDriverFactory { fun createDriver(): SqlDriver }
75. internal class Database(databaseDriverFactory: DatabaseDriverFactory) { private val database = AppDatabase(databaseDriverFactory.createDriver()) private val dbQuery = database.appDatabaseQueries } Database.kt(com.kdhillon.spacex.shared.cache)
76. internal class Database(databaseDriverFactory: DatabaseDriverFactory) { private val database = AppDatabase(databaseDriverFactory.createDriver()) private val dbQuery = database.appDatabaseQueries } Database.kt(com.kdhillon.spacex.shared.cache)
77. internal class Database(databaseDriverFactory: DatabaseDriverFactory) { private val database = AppDatabase(databaseDriverFactory.createDriver()) private val dbQuery = database.appDatabaseQueries } Database.kt(com.kdhillon.spacex.shared.cache) actual class DatabaseDriverFactory(private val context: Context) { actual fun createDriver(): SqlDriver { return AndroidSqliteDriver(AppDatabase.Schema, context, "test.db") } }
78. internal class Database(databaseDriverFactory: DatabaseDriverFactory) { private val database = AppDatabase(databaseDriverFactory.createDriver()) private val dbQuery = database.appDatabaseQueries } Database.kt(com.kdhillon.spacex.shared.cache) actual class DatabaseDriverFactory(private val context: Context) { actual fun createDriver(): SqlDriver { return AndroidSqliteDriver(AppDatabase.Schema, context, "test.db") } }
79. internal class Database(databaseDriverFactory: DatabaseDriverFactory) { private val database = AppDatabase(databaseDriverFactory.createDriver()) private val dbQuery = database.appDatabaseQueries } Database.kt(com.kdhillon.spacex.shared.cache) actual class DatabaseDriverFactory(private val context: Context) { actual fun createDriver(): SqlDriver { return AndroidSqliteDriver(AppDatabase.Schema, context, "test.db") } } actual class DatabaseDriverFactory { actual fun createDriver(): SqlDriver { return NativeSqliteDriver(AppDatabase.Schema, "test.db") } }
80. internal class Database(databaseDriverFactory: DatabaseDriverFactory) { private val database = AppDatabase(databaseDriverFactory.createDriver()) private val dbQuery = database.appDatabaseQueries } Database.kt(com.kdhillon.spacex.shared.cache) actual class DatabaseDriverFactory(private val context: Context) { actual fun createDriver(): SqlDriver { return AndroidSqliteDriver(AppDatabase.Schema, context, "test.db") } } actual class DatabaseDriverFactory { actual fun createDriver(): SqlDriver { return NativeSqliteDriver(AppDatabase.Schema, "test.db") } }
81. internal class Database(databaseDriverFactory: DatabaseDriverFactory) { private val database = AppDatabase(databaseDriverFactory.createDriver()) private val dbQuery = database.appDatabaseQueries } Database.kt(com.kdhillon.spacex.shared.cache) actual class DatabaseDriverFactory(private val context: Context) { actual fun createDriver(): SqlDriver { return AndroidSqliteDriver(AppDatabase.Schema, context, "test.db") } } actual class DatabaseDriverFactory { actual fun createDriver(): SqlDriver { return NativeSqliteDriver(AppDatabase.Schema, "test.db") } }
82. internal class Database(databaseDriverFactory: DatabaseDriverFactory) { private val database = AppDatabase(databaseDriverFactory.createDriver()) private val dbQuery = database.appDatabaseQueries } Database.kt(com.kdhillon.spacex.shared.cache)
83. internal class Database(databaseDriverFactory: DatabaseDriverFactory) { private val database = AppDatabase(databaseDriverFactory.createDriver()) private val dbQuery = database.appDatabaseQueries } Database.kt(com.kdhillon.spacex.shared.cache)
84. internal class Database(databaseDriverFactory: DatabaseDriverFactory) { private val database = AppDatabase(databaseDriverFactory.createDriver()) private val dbQuery = database.appDatabaseQueries } Database.kt(com.kdhillon.spacex.shared.cache)
85. class SpaceXApi { companion object { private const val LAUNCHES_ENDPOINT = "https://api.spacexdata.com/v3/launches" } private val httpClient = HttpClient { install(JsonFeature) { val json = kotlinx.serialization.json.Json { ignoreUnknownKeys = true } serializer = KotlinxSerializer(json) } } suspend fun getAllLaunches(): List<RocketLaunch> { return httpClient.get(LAUNCHES_ENDPOINT) } } SpaceXApi.kt(com.kdhillon.spacex.shared.network)
86. class SpaceXApi { companion object { private const val LAUNCHES_ENDPOINT = "https://api.spacexdata.com/v3/launches" } private val httpClient = HttpClient { install(JsonFeature) { val json = kotlinx.serialization.json.Json { ignoreUnknownKeys = true } serializer = KotlinxSerializer(json) } } suspend fun getAllLaunches(): List<RocketLaunch> { return httpClient.get(LAUNCHES_ENDPOINT) } } SpaceXApi.kt(com.kdhillon.spacex.shared.network)
87. class SpaceXApi { companion object { private const val LAUNCHES_ENDPOINT = "https://api.spacexdata.com/v3/launches" } private val httpClient = HttpClient { install(JsonFeature) { val json = kotlinx.serialization.json.Json { ignoreUnknownKeys = true } serializer = KotlinxSerializer(json) } } suspend fun getAllLaunches(): List<RocketLaunch> { return httpClient.get(LAUNCHES_ENDPOINT) } } SpaceXApi.kt(com.kdhillon.spacex.shared.network)
88. <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.kdhillon.spacex.androidApp"> <uses-permission android:name="android.permission.INTERNET"/> <application android:allowBackup="false" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN"/> <category android:name="android.intent.category.LAUNCHER"/> </intent-filter> </activity> </application> </manifest> AndroidManifest.xml(/Users/karandhillon/Desktop/Personal/SpaceX/androidApp/src/main/AndroidManifest.xml)
89. <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.kdhillon.spacex.androidApp"> <uses-permission android:name="android.permission.INTERNET"/> <application android:allowBackup="false" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN"/> <category android:name="android.intent.category.LAUNCHER"/> </intent-filter> </activity> </application> </manifest> AndroidManifest.xml(/Users/karandhillon/Desktop/Personal/SpaceX/androidApp/src/main/AndroidManifest.xml)
90. <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.kdhillon.spacex.androidApp"> <uses-permission android:name="android.permission.INTERNET"/> <application android:allowBackup="false" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN"/> <category android:name="android.intent.category.LAUNCHER"/> </intent-filter> </activity> </application> </manifest> AndroidManifest.xml(/Users/karandhillon/Desktop/Personal/SpaceX/androidApp/src/main/AndroidManifest.xml)
91. class SpaceXSDK(databaseDriverFactory: DatabaseDriverFactory) { private val database = Database(databaseDriverFactory) private val api = SpaceXApi() @Throws(Exception::class) suspend fun getLaunches(forceReload: Boolean): List<RocketLaunch> { val cachedLaunches = database.getAllLaunches() return if (cachedLaunches.isNotEmpty() && !forceReload) { cachedLaunches } else { api.getAllLaunches().also { database.clearDatabase() database.createLaunches(it) } } } } SpaceXSDK.kt(com.kdhillon.spacex.shared)
92. plugins { id("com.android.application") kotlin("android") } dependencies { implementation(project(":shared")) implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.3.9") implementation("androidx.core:core-ktx:1.3.1") implementation("com.google.android.material:material:1.2.0") implementation("androidx.appcompat:appcompat:1.2.0") implementation("androidx.constraintlayout:constraintlayout:2.0.0") implementation("androidx.recyclerview:recyclerview:1.1.0") implementation("androidx.swiperefreshlayout:swiperefreshlayout:1.1.0") implementation("androidx.cardview:cardview:1.0.0") } Build.gradle.kts (androidApp)
93. plugins { id("com.android.application") kotlin("android") } dependencies { implementation(project(":shared")) implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.3.9") implementation("androidx.core:core-ktx:1.3.1") implementation("com.google.android.material:material:1.2.0") implementation("androidx.appcompat:appcompat:1.2.0") implementation("androidx.constraintlayout:constraintlayout:2.0.0") implementation("androidx.recyclerview:recyclerview:1.1.0") implementation("androidx.swiperefreshlayout:swiperefreshlayout:1.1.0") implementation("androidx.cardview:cardview:1.0.0") } Build.gradle.kts (androidApp)
94. plugins { id("com.android.application") kotlin("android") } dependencies { implementation(project(":shared")) implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.3.9") implementation("androidx.core:core-ktx:1.3.1") implementation("com.google.android.material:material:1.2.0") implementation("androidx.appcompat:appcompat:1.2.0") implementation("androidx.constraintlayout:constraintlayout:2.0.0") implementation("androidx.recyclerview:recyclerview:1.1.0") implementation("androidx.swiperefreshlayout:swiperefreshlayout:1.1.0") implementation("androidx.cardview:cardview:1.0.0") } Build.gradle.kts (androidApp)
95. class MainActivity : AppCompatActivity() { private val mainScope = MainScope() private val sdk = SpaceXSDK(DatabaseDriverFactory(this)) private lateinit var launchesRecyclerView: RecyclerView private lateinit var progressBarView: FrameLayout private lateinit var swipeRefreshLayout: SwipeRefreshLayout private val launchesRvAdapter = LaunchesRvAdapter(listOf()) override fun onCreate(savedInstanceState: Bundle?) { // ... } private fun displayLaunches(needReload: Boolean) { progressBarView.isVisible = true mainScope.launch { kotlin.runCatching { sdk.getLaunches(needReload) }.onSuccess { launchesRvAdapter.launches = it launchesRvAdapter.notifyDataSetChanged() }.onFailure { Toast.makeText(this@MainActivity, it.localizedMessage, Toast.LENGTH_SHORT).show() } progressBarView.isVisible = false } } } MainActivity.kt (androidApp)
96. class MainActivity : AppCompatActivity() { private val mainScope = MainScope() private val sdk = SpaceXSDK(DatabaseDriverFactory(this)) private lateinit var launchesRecyclerView: RecyclerView private lateinit var progressBarView: FrameLayout private lateinit var swipeRefreshLayout: SwipeRefreshLayout private val launchesRvAdapter = LaunchesRvAdapter(listOf()) override fun onCreate(savedInstanceState: Bundle?) { // ... } private fun displayLaunches(needReload: Boolean) { progressBarView.isVisible = true mainScope.launch { kotlin.runCatching { sdk.getLaunches(needReload) }.onSuccess { launchesRvAdapter.launches = it launchesRvAdapter.notifyDataSetChanged() }.onFailure { Toast.makeText(this@MainActivity, it.localizedMessage, Toast.LENGTH_SHORT).show() } progressBarView.isVisible = false } } } MainActivity.kt (androidApp)
97. class MainActivity : AppCompatActivity() { private val mainScope = MainScope() private val sdk = SpaceXSDK(DatabaseDriverFactory(this)) private lateinit var launchesRecyclerView: RecyclerView private lateinit var progressBarView: FrameLayout private lateinit var swipeRefreshLayout: SwipeRefreshLayout private val launchesRvAdapter = LaunchesRvAdapter(listOf()) override fun onCreate(savedInstanceState: Bundle?) { // ... } private fun displayLaunches(needReload: Boolean) { progressBarView.isVisible = true mainScope.launch { kotlin.runCatching { sdk.getLaunches(needReload) }.onSuccess { launchesRvAdapter.launches = it launchesRvAdapter.notifyDataSetChanged() }.onFailure { Toast.makeText(this@MainActivity, it.localizedMessage, Toast.LENGTH_SHORT).show() } progressBarView.isVisible = false } } } MainActivity.kt (androidApp)
98. class MainActivity : AppCompatActivity() { private val mainScope = MainScope() private val sdk = SpaceXSDK(DatabaseDriverFactory(this)) private lateinit var launchesRecyclerView: RecyclerView private lateinit var progressBarView: FrameLayout private lateinit var swipeRefreshLayout: SwipeRefreshLayout private val launchesRvAdapter = LaunchesRvAdapter(listOf()) override fun onCreate(savedInstanceState: Bundle?) { // ... } private fun displayLaunches(needReload: Boolean) { progressBarView.isVisible = true mainScope.launch { kotlin.runCatching { sdk.getLaunches(needReload) }.onSuccess { launchesRvAdapter.launches = it launchesRvAdapter.notifyDataSetChanged() }.onFailure { Toast.makeText(this@MainActivity, it.localizedMessage, Toast.LENGTH_SHORT).show() } progressBarView.isVisible = false } } } MainActivity.kt (androidApp)
99. class MainActivity : AppCompatActivity() { private val mainScope = MainScope() private val sdk = SpaceXSDK(DatabaseDriverFactory(this)) private lateinit var launchesRecyclerView: RecyclerView private lateinit var progressBarView: FrameLayout private lateinit var swipeRefreshLayout: SwipeRefreshLayout private val launchesRvAdapter = LaunchesRvAdapter(listOf()) override fun onCreate(savedInstanceState: Bundle?) { // ... } private fun displayLaunches(needReload: Boolean) { progressBarView.isVisible = true mainScope.launch { kotlin.runCatching { sdk.getLaunches(needReload) }.onSuccess { launchesRvAdapter.launches = it launchesRvAdapter.notifyDataSetChanged() }.onFailure { Toast.makeText(this@MainActivity, it.localizedMessage, Toast.LENGTH_SHORT).show() } progressBarView.isVisible = false } } } MainActivity.kt (androidApp)
101. Fantasy Premier League A Kotlin Multiplatform project using jetpack compose for android & desktop and swiftUI
102. Challenges Ahead With KMM • KMM is still in alpha, and the public API’s are expected to be changed frequently given its scale. • Deploying a KMM project in production therefore should be prohibited. • A lot of edge-cases might be encountered when working in KMM, such as how to manage sensitive information.
103. Is KMM The 🔑 To Hybrid?
104. Resources Slide Deck https://speakerdeck.com/karandhillon/kotlin-goes-global Fantasy Premier League https://github.com/karanDhillon/FantasyPremierLeague Kotlin Multiplatform Hands-On: Networking and Data Storage http://kotl.in/try-kmm
105. Reach out to me @ @karandhillon95 https://kdhillon.com