I’m seeing a strange issue with coroutines inside of

Flow

. I’m performing a blocking call on a coroutine thread (Using Dispatchers.IO), and because of that, even though the Collecting flow is finished, the cancellation logic (killing a process in this case), doesn’t happen for a good while after:

try {
    while (currentCoroutineContext().isActive && process.isAlive) {
        val line = bufferedProcessSource.readUtf8Line() ?: break
        emit(line)
    }
} catch (e: CancellationException) {
    throw e
} finally {
    if (process.isAlive) {
        println("C$id - Destroying Process")
        process.destroy()
    }
}

Can anybody help me understand how I can use iOS classes in Kotlin? For example, I want to get a database path in iOS, we already have it on Android using the context, but for iOS I'm not sure how. I can't import the swift class right since its compiled before hand or something, but we can use the Objective C classes? For example, this logic here:

//get an instance of the File Manager
NSFileManager *fileManager = [NSFileManager defaultManager];

   //we'll list file in the temporary directory

NSString * strPath = NSTemporaryDirectory();

//we'll need NSURL for the File Manager
NSURL *tempDirURL = [NSURL fileURLWithPath:strPath];


  //An array of NSURL object representing the path to the file
    //using the flag NSDirectoryEnumerationSkipsHiddenFiles to skip hidden files

NSArray *directoryList = [fileManager contentsOfDirectoryAtURL:tempDirURL 
                      includingPropertiesForKeys:nil 
              options:NSDirectoryEnumerationSkipsHiddenFiles error:nil];

How can that be written in Kotlin? I think I need to do import platform.Foundation.NSFileManager right? I'm not sure exactly how I can find a .db file though. Or use these classes / methods. Is there a way to see method names etc in the IDE? Right now it seems to import but its red and I can't see methods etc. Any tips would be great

When I run

./gradlew assembleXCFramework

, the resulting XCFramework is missing the

ios-arm64-simulator

slice. What am I doing wrong?

Hi friends! We have a Kotlin JVM project which currently uses MVEL as expression language. One of our long term goals is to provide native executables. Therefore we are migrating to Kotlin multiplatform, but the MVEL dependency seems to be still a blocker for us. Does anybody know of any expression language in which we could use? Any feedback is welcome. Thanks! 😉

Also, we have several cinterop .def files etc, we can use them in iosMain,however all references to the classes are Red, like they are not resolved. Any ideas on how this can be fixed? If its even possible I'm not sure. It compiles fine just auto complete/import and viewing of methods etc doesnt work

⚠️ IMPORTANT PSA FOR MULTIPLATFORM/ANDROID LIBRARY AUTHORS ⚠️ TL;DR: Publishing multiplatform libraries with Android Gradle Plugin 7.1.0-alpha13 (or higher) will require Kotlin Gradle Plugin 1.6.10 (or higher). # What happened We detected a recent incompatibility between newer pre-release Android Gradle Plugin versions and the current Kotlin Multiplatform Gradle Plugin. To be more precise: Starting from AGP version 7.1.0-alpha13, Android related Gradle configurations will set an internal attribute that will unfortunately be copied by Kotlin during the publication process of a library. This Gradle attribute will effectively tell Gradle, that the Library is only compatible with builds using the exact same AGP version. Obviously, this is not correct and not desirable. Libraries published with this attribute will therefore be almost “un-consumable” by users. ____________ # Consequences for you (the Library author) When upgrading AGP to 7.1.0-alpha13 (or higher), make sure you are using Kotlin Gradle Plugin 1.6.10 (or higher) to create proper publications. When using AGP 7.1.0-alpha12 (or lower), this does not affect you. ____________ # Consequences for you (Application Developer) None, enjoy! ____________ # Appendix We know, that issues like this are uncomfortable for users. Integrating Android into multiplatform is hard and this is not the first time we suffered from Android+Multiplatform issues. We (the Kotlin, more precise the Kotlin Multiplatform Core, Team) are aware of this and are actively working together with Google (more precise the AGP team) to find better ways of working together/integrating. Some very ambiguous plans were made recently and we started working on it already. ____________ The workaround on the Kotlin Gradle Plugin side can be tracked here: https://youtrack.jetbrains.com/issue/KT-49798 This is currently in review and is planned to be shipped in 1.6.10 Thanks folks and I hope you’ll have a more enjoyable Friday than I do 😁 K

Having at least 1 normal Multiplatform build (js+jvm+native) + 1 Multiplatform with android seems to break the build by loading a plugin 2 times, although I used the apply false method. Any ideas how I can fix it or what am I doing wrong? `settings.gradle.kts`:

pluginManagement {
    resolutionStrategy {
        eachPlugin {
            if (requested.id.namespace == "com.android") {
                useModule("com.android.tools.build:gradle:4.1.2")
            }
        }
    }
    plugins {
        id("com.android.library") apply false
        kotlin("multiplatform") version kotlin_version apply false
        kotlin("plugin.serialization") version kotlin_version apply false

subproject `build.gradle.kts`:

plugins {
    kotlin("multiplatform")
    kotlin("plugin.serialization")
    id("com.android.library")
}

kotlin {
js {browser {

        }}}

Short trace:

org.gradle.internal.exceptions.LocationAwareException: Build file '/Users/mihaivo/IdeaProjects/gaia/gaia-phone-client/build.gradle.kts' line: 26

Caused by: org.gradle.api.reflect.ObjectInstantiationException: Could not create an instance of type org.jetbrains.kotlin.gradle.targets.js.subtargets.KotlinBrowserJs.
	at org.gradle.internal.instantiation.generator.DependencyInjectingInstantiator.doCreate(DependencyInjectingInstantiator.java:69)
	at org.gradle.internal.instantiation.generator.DependencyInjectingInstantiator.newInstance(DependencyInjectingInstantiator.java:55)
	at org.gradle.api.internal.model.DefaultObjectFactory.newInstance(DefaultObjectFactory.java:85)

Caused by: java.lang.IllegalStateException: The Kotlin Gradle plugin was loaded multiple times in different subprojects, which is not supported and may break the build. 
This might happen in subprojects that apply the Kotlin plugins with the Gradle 'plugins { ... }' DSL if they specify explicit versions, even if the versions are equal.
Please add the Kotlin plugin to the common parent project or the root project, then remove the versions in the subprojects.
If the parent project does not need the plugin, add 'apply false' to the plugin line.
See: <https://docs.gradle.org/current/userguide/plugins.html#sec:subprojects_plugins_dsl>
	at org.jetbrains.kotlin.gradle.targets.js.MultiplePluginDeclarationDetector.detect(MultiplePluginDeclarationDetector.kt:26)
	at org.jetbrains.kotlin.gradle.targets.js.MultiplePluginDeclarationDetector$Companion.detect(MultiplePluginDeclarationDetector.kt:52)
	at org.jetbrains.kotlin.gradle.targets.js.nodejs.NodeJsRootPlugin.apply(NodeJsRootPlugin.kt:23)

Hi guys, I updated the kmm plugin and then upgraded kotlin version to

1.6.0

and the project is not syncing anymore. I also get the same error when trying to create a new KMM project. I have tried

pod install

in

iosApp

and then sync but still the same error. I have also tried invalidate caches and restart (AS). Stack trace in the thread.

async

is not resolved from my common package but

CompletableDeferred

is. Does kmm prevent usage of

async

keyword somehow? Or is it because I’m using the native-mt version of kotlinx.coroutine?

👋 I have a shared KMM module that is fetched from a git submodule from my Android app. Each time gradle is synced, Android Studio is running the iOS tasks which actually take plenty of time and are not needed in this context. In other place, I use this KMM module to produce a XCFramework that is published using Cocoapods, there I really need the iOS tasks. Is there any way to disable the iOS building stuff in the Android app context?

If I have android project with dagger @Inject constructors on classes I want now to share via multiplatform, I'm screwed right? (talking about the inject annotation, coming from jdk)

I’m still on Xcode

12.5.1

, wondering about updating to 13, I guess it should be safe already. Did anyone face issues on updating the version?

All legacy issues aside, is there any reason to have an Android module as opposed to putting all Android code into AndroidMain in the shared module?

I’m trying to get the week of the year value based on this logic :

expect fun weekOfYear(time: String): Int

// android
actual fun weekOfYear(time: String): Int {
    val calendar: Calendar = Calendar.getInstance(TimeZone.getDefault())
    val sdf = SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZ", Locale.getDefault())
    calendar.time = sdf.parse(time)!!
    return calendar.get(Calendar.WEEK_OF_YEAR)
}

// ios
actual fun weekOfYear(time: String): Int {
    val dateFormatter = NSDateFormatter().apply {
        setDateStyle(none)
        setTimeStyle(none)
        setTimeZone(NSTimeZone.defaultTimeZone)
        setDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZ")
    }

    val date = dateFormatter.dateFromString(time)
    date ?: return 0

    val calendar = NSCalendar.currentCalendar
    val components = calendar.components(NSCalendarUnitWeekOfYear, date)
    return components.weekOfYear.toInt()
}

But it gives me different results out of the same date

"2021-01-01T22:00:00.000+0000"

This tests fails on iOS

@Test
fun `week of year should be 1`() {
    val weekOfYear = weekOfYear("2021-01-01T22:00:00.000+0000")
    assertEquals(1, weekOfYear)
}

it return

53

on iOS. Any advice on how to fix this?

Hey all, any ideas why this isn’t importing? This is inside my androidMain

Hi folks, I am trying to build a KMP library for Android and iOS. I followed this tutorial https://kotlinlang.org/docs/mpp-create-lib.html But when I try to use the library in iOS project I get this error

the linked and embedded framework is missing one or more architectures required by this target: arm64

I am using M1 Mac and trying to run it with simulator so that will be an issue (since we see no issue on other architectures). The weird part is that the template task mentions arm64 architecture:

val packForXcode by tasks.creating(Sync::class) {
    group = "build"
    val mode = System.getenv("CONFIGURATION") ?: "DEBUG"
    val sdkName = System.getenv("SDK_NAME") ?: "iphonesimulator"
    val targetName = "ios" + if (sdkName.startsWith("iphoneos")) "Arm64" else "X64"
    val framework =
        kotlin.targets.getByName<KotlinNativeTarget>(targetName).binaries.getFramework(mode)
    inputs.property("mode", mode)
    dependsOn(framework.linkTask)
    val targetDir = File(buildDir, "xcode-frameworks")
    from({ framework.outputDirectory })
    into(targetDir)
}

When I try KMM project I don't have this problem (but then the library is linked, so it is a different scenario). Any ideas or experience with this?

android.util.*

and

java.util.*

in commonMain?

⚠️ CAUTION! Authors of Kotlin Multiplatform libraries with Android targets please be aware that we recently discovered a couple of issues affecting the compatibility of libraries published in setups that use the most recent versions of Kotlin, Gradle, and the Android Gradle plugin. We recommend that you continue using Kotlin 1.5.31 and AGP 7.0.X (or older), rather than upgrading either of them. Kotlin 1.5.32 and Kotlin 1.6.10 will arrive shortly with compatibility fixes. 🛠️

Is there a good project/example of using BackgroundTask to trigger a function from shared module? Our efforts end up with Uncaught Kotlin exception: kotlin.native.IncorrectDereferenceException: illegal attempt to access non-shared org.koin.core.context.GlobalContext.KoinInstanceHolder@82f9b368 from other thread. Apparently, our shared Model, which is a KoinComponent, gets frozen, when we use Model.getProgress() in the ios background task, if I understand it correctly

🕊️ Seems like announcing mocking frameworks compatible with Kotlin/Native and Kotlin Multiplatform is all the rage these days, and as such, I too wish to present a mocking framework, called Mockative, with these notable highlights and features: • Supports effortless multithreading in coroutines • No default return values • Concise, non-intrusive API • Supports both expression and matcher based stubbing • Fully type-safe • Mocking of interfaces Testing with Mockative couldn’t be simpler, as all that’s required is annotating a property with

@Mock

and assigning it to the value of a call to the

<T> mock(KClass<T>)

function:

class GitHubServiceTests {
    @Mock
    val api = mock(GitHubAPI::class)
}

Please see the README for instructions on how to get started using Mockative today. We would love to hear your feedback on the framework.

Holla fellow programmers, is it possible to build KMM library for Android target on Linux machine and then build iOS target on Mac machine? I mean split the build.

It looks like KMM Plugin v0.3.0 ( https://kotlinlang.org/docs/kmm-plugin-releases.html#release-details ) changed the shared module template a little. While updating a project, I see that

val iosMain by getting

is now replaced by

val iosMain by creating

and using

{
  dependsOn(commonMain)
  iosX64Main.dependsOn(this)
  iosArm64Main.dependsOn(this)
  //iosSimulatorArm64Main.dependsOn(this)
}

With

iosX64Main

and

iosArm64Main

being split up to its own

val

. Does this mean I should be adding the dependencies for both (basically just copy them over in both sections)? For some reason, Android studio doesnt want to resolve the correct driver (for sqldelight in my case). See screenshots in the 🧵 .

Hi! I have question about Cocoa Pods dependencies in KMM. Suppose there are two multi-platform modules “lib” and “shared” “shared” depends on “lib” Both modules require AFNetworking framework. What is the proper way to add CocoaPods dependency on AFNetworking? Should I add this fragment to both modules or just to module “lib”? pod(“AFNetworking”) { version = “~> 4.0.1” }

for those of you doing an iOS / Android project - what is your typical folder structure like? do you have iOS, Android, and Shared code in one git repo or separate repo’s for each?

How do we call functions from

commonMain

source set from the consumer of the corresponding android target AAR? Right now my project has a couple public composables defined in

commonMain

, but they're not visible to my android project. The AAR is resolved via

mavenLocal

at the moment

non-technical question. When the KMP was announced? I can find a lot of articles about KMM, but not KMP. When it was released, when it was in alpha stage?

Is it possible to use

org.jetbrains:annotations

from commonMain? I can’t seem to get it to work.. Assuming the dependency is only available for JVM, is there any way to add annotations for jvm target? 🤔

If I have an Android target, and define a const val in the common source set, will this variable be accessible to the app that consumes the AAR artifact in a non mono repo scenario? E.g a standard maven artifact ? Curious how the commonMain source set merging / package visibility works

there isn't any plain

assert()

from kotlin common stdlib for testing?

Following through this guide to migrate from old

packForXCode

task to

embedAndSignAppleFrameworkForXcode

. In step 4, setting linker flags where we have to do

$(inherited) -framework shared

how would we link more than one library here?