MultiPlatformKotlin-Feb20

About this project:

This project was written in February 2020 to match the new platforms (Xcode and Android Studio).

Xcode 11.0
Android Studio 3.6
Dependecies versions:

    ext.kotlin_version = '1.3.61'
    ext.ktorVer = '1.3.0'
    ext.coroutinesVer = '1.3.3'
    ext.kotlix_serialization = '0.14.0'

This project was planned to make android and iOS platforms to use the same business logic that was written once. As Kotlin-Multi-Platform is still experimental, the function to format numbers was written from scratch in the "common" directory instead of using the android or iOS native ways.

This project uses https://exchangeratesapi.io/ API to recieve exchange rates.

This Medium article was very helpfull trying to make the first Kotlin Multi Platform project:

https://medium.com/dev-machina/multiplatform-programming-using-kotlin-native-a-mobile-developers-quest-part-2-c903fda4f23

Kotlin Multi platform - Jetbrains - main

https://www.jetbrains.com/lp/mobilecrossplatform/

Ktor

releases:

https://github.com/ktorio/ktor/releases

Serialization

Kotlin cross-platform / multi-format reflectionless serialization:

https://github.com/Kotlin/kotlinx.serialization

Kotlinx Serialization Release Notes:

https://github.com/Kotlin/kotlinx.serialization/releases

Xcode plugin for kotlin

Known Issues

Ktor version 1.2.4 works with Kotlin version 1.3.50 and with coroutines version 1.3.0 and gradle 5.4.1 - this works with Xcode 10.3 - for Xcode 11+ use the following versions:

    ext.kotlin_version = '1.3.61'
    ext.ktorVer = '1.3.0'
    ext.coroutinesVer = '1.3.3'
    ext.kotlix_serialization = '0.14.0'

Updated versions:

    ext.kotlin_version = '1.3.71'
    ext.ktorVer = '1.3.2'
    ext.coroutinesVer = '1.3.3'
    ext.kotlix_serialization = '0.20.0'

Changing versions results in ./gradlew build failling.
Inheritance is not possible with Kotlin-Multiplatform. At this point it is a known bug that reflects on each kotlin versions - up to 1.4 : The only workaround is to put the classes in the same file with the inherited class
Upgrading kotlin version, ktor, and gradle versions requires Xcode 11
The error:

More than one file was found with OS independent path 'META-INF/ktor-http.kotlin_module'

can be fixed by adding this code to app build.gradle:

packagingOptions {
        exclude 'META-INF/DEPENDENCIES'
        exclude("META-INF/*.kotlin_module")
}

or:

packagingOptions {
        exclude 'META-INF/DEPENDENCIES'
        exclude 'META-INF/LICENSE'
        exclude 'META-INF/LICENSE.txt'
        exclude 'META-INF/license.txt'
        exclude 'META-INF/NOTICE'
        exclude 'META-INF/NOTICE.txt'
        exclude 'META-INF/notice.txt'
        exclude 'META-INF/ASL2.0'
        exclude("META-INF/*.kotlin_module")
}

Xcode script:

cd $SRCROOT/../../SharedModule/build/xcode-frameworks
./gradlew :SharedModule:packForXCode -PXCODE_CONFIGURATION=${CONFIGURATION}

alesha712/KotlinMPPUpdated