kotlinlang #multiplatform

so i am trying to use multiplatform with gradle-kts and for some reason on dependencies block api and implementation seem to be special cases and they work (although only with a single string input, no splitting into group, name, version) and compile or even custom configurations do not work at all using gradle 5.5 and kotlin 1.3.40 the custom configuration is set up in a plugin in buildSrc

DefaultKotlinDependencyHandler

seems to not handle things that the nromal dependencies block ca.. or maybe its just the kts bit thats broken ?

kpgalligan

07/09/2019, 2:16 PM

I’m a little new with the JS side of multiplatform. Running tests with backtick names does not work. Is that just the way I have it configured, or do backtick names need JsName on them?

addamsson

07/09/2019, 11:08 PM

I'm looking for a library for kotlin common which has persistent data structures and I just bumped into this one: https://github.com/Kotlin/kotlinx.collections.immutable i'm wondering why is this not a multiplatform project? Do any of you have experience with this?

altavir

07/10/2019, 8:09 AM

Could you remind me how to add JavaExec task to mutliplatform? I believe it was answered several times, but I forgot again.

Marc Knaup

07/10/2019, 9:29 PM

What am I doing wrong if the JVM version attribute is used for resolving dependencies but when publishing the artifact the attribute is unexpectedly absent from the published

.module

jvm {
	attributes {
		attribute(TargetJvmVersion.TARGET_JVM_VERSION_ATTRIBUTE, 7)
	}
}

It does work in another multiplatform library which has multiple JVM targets. Update: Got it. It happens if I dare to call

subprojects { apply<MavenPublishPlugin>() }

. Is that a bug in MP or Gradle?

Alejandro Rios

07/11/2019, 1:26 AM

Hello Beautiful people, i'm new in this slack, working with Kotlin on Android and it's really cool, recently i was searching about

Kotlin Native-Multiplatform

in Medium articles and the page of raywenderlich, can you share please more resources to check?? Thanks

👋 2

Cyrille QUÉMIN

07/11/2019, 11:12 AM

Hey guys, kotlin co routine multiplatform mentioned that it is single thread (js style) on native platform. Is it exactly like JS with a delegation principal to a background thread? Or does everything solely run on the main thread ??? If so. Is there a way to "hook" it up to iOS dispatch system in order to have at least one more thread to be able to do computation in the background and updating progress on the main thread for example?

Sergioedcigreja

07/11/2019, 12:58 PM

Hello everyone, I'm trying to get a device id from both platforms however I'm having trouble with android. I can't seem to use the android sdk in the androidMain module. I've already set the sdk.dir in local.properties so I don't know if I'm missing something..

alex.hart

07/12/2019, 1:10 PM

I don’t think you can do this, because the T of MyClass is erased at compile time, isn’t it? What benefit is reification giving you in your suspend fn?

markusa

07/13/2019, 9:05 AM

Is there a way to exclude sources by pattern with the multiplatform plugin? What I did before:

sourceSets {
    main {
        kotlin {
            srcDir 'src/main/kotlin'

            if(isAndroid) {
                exclude '**/*Backtick*'
            }
        }
    }

now I have

kotlin {
    jvm()
    jvm('android')
    jvmMain {...}
    jvmTest {...}
    androidMain {
        kotlin.srcDirs += jvmMain.kotlin.srcDirs // exclude **/*Backtick*?
   }
   androidTest {
        kotlin.srcDirs += jvmTest.kotlin.srcDirs // exclude **/*Backtick*?
   }
}

markusa

07/13/2019, 9:35 AM

I'm btw. currently moving Kluent from an old manual Gradle approach (supporting all platforms aside from native) to the multiplatform plugin, to get support for native in. If you're interested in having a look or share feedback: https://github.com/MarkusAmshove/Kluent/pull/148

altavir

07/13/2019, 3:10 PM

@udalov, I've hit a wall with https://youtrack.jetbrains.com/issue/KT-28927. In a single project it could be resolved by clean build, but in separate projects, I can't find a way to fix it. Is there a workaround until 1.3.50?

spierce7

07/14/2019, 7:02 PM

Is there a multiplatform Float or Double to String writer? I need a way to chop off the

x.0

at the end when there is no decimal data.

JoakimForslund

07/15/2019, 7:53 AM

Wanted to be able to directly run my jvm target in my Multiplatform setup. Using the following kotlin gradle script i'm trying to launch the

Application.kt

file placed inside my package called `box`:

tasks.create("run", JavaExec::class) {
    dependsOn("jvmMainClasses", "jvmJar")
    main = "box.ApplicationKt"
    classpath = files(
        kotlin.targets["jvm"].compilations["main"].output.allOutputs.files,
        configurations["jvmRuntimeClasspath"]
    )
    args = listOf()
}

However, this results in :

Error: Could not find or load main class box.ApplicationKt

Anyone have any pointers to run a jvm target?

addamsson

07/15/2019, 1:24 PM

I'm working on some code in a

common

module (

commonMain

) and I have my tests in

commonTest

. When I run my tests with Coverage in IDEA I get

No coverage results

. How can I configure IDEA to do Coverage for

common

code?

kpgalligan

07/15/2019, 10:02 PM

Working on client leads. Have some questions for the folks out there using KMP in production (for native mobile)

Nikolai

07/16/2019, 12:46 AM

Hi, everyone I have a question about multiplatform project structure. In IDEA we have two main patterns mobile shared library and mobile android/ios. For library I understand it. We have app.framework for iOS and jar file for android. As for Mobile Android/iOS pattern I don't have clear picture. We still have framework for iOS, but how common module code applied to android? I saw in build.gradle that we use task

kotlin {
    android("android")
    ....
}

But I don't understand what exactly it doing, what means "android" as parameter, what we have as output? And as result how common module code goes to android part? P.S. Also, is where any place I can found docs to understand that closures have this plugin (kotlin-multiplatform), plugin tasks, what they do and how they works?

ribesg

07/16/2019, 8:55 AM

I’ve been publishing both

-android

and

-android-debug

variants of my kmp libs until now because I never managed to force a kmp library B to use the kmp library A’s

-android

release in its

-android-debug

build. Now I’m making another lib and I feel like I should stop publishing debug builds. Anyone encounter this problem and worked around it?

darkmoon_uk

07/16/2019, 8:55 AM

Here's an up-to-date :kotlin:*Multi-Platform Template* for all: https://github.com/chris-hatton/kotlin-multiplatform-template Using newest Multi-Platform plugin to compile for: ⚙️ Ktor-based Server :android: Android Mobile/Tablet 📺 Android TV 🍏 iOS Mobile/Tablet :java: JavaFX Desktop MVP Architecture is favoured 👌 Coroutines and Serialization are set-up ✅ Shared library exists between Server and Client to share Models 🤝 Another shared library across Clients to share Presenters 💁‍♂️ Android has a final shared library for Views between Mobile & TV I would like to add an experimental Kotlin/WASM client soon. All welcome to fork/use, and especially welcome to suggest improvements ❗🙂

👍 4

Dmitry Motyl

07/16/2019, 12:18 PM

Guys, where is the difference between

./gradlew android:build

via terminal and

build

via Android Studio? I get exception

e: java.lang.NoClassDefFoundError: javax/xml/bind/JAXBException

if I build via terminal..

alex.hart

07/16/2019, 4:58 PM

Come up with a ‘PreferenceStore’ interface, and then have an Android impl (Using SharedPreferences) and an iOS impl (using UserDefaults). Then wherever you need it, just accept it as an argument, and let dependency injection do the rest.

Michał Kalinowski

07/17/2019, 7:56 PM

such error appear

-.txt

ciriti

07/18/2019, 9:52 AM

Morning guys! Currently, I'm receiving the following error after the updating to Kotlin 1.3.40, does anyone have the same issue?

russhwolf

07/18/2019, 4:47 PM

If I understand correctly, https://youtrack.jetbrains.com/issue/KT-20427 would let you do what you want

Jan Stoltman

07/19/2019, 12:10 AM

Hey guys, is there any multiplatform logging library for Android/iOS out there? @kpgalligan has mentioned that he has a K/N version of Timber in his droidcon SF 2018 talk iirc, is it out somewhere?

altavir

07/19/2019, 7:50 AM

Do anybody have a build sample with new mpp with webpack bundle?

Sergioedcigreja

07/19/2019, 9:36 AM

https://files.slack.com/files-pri/T09229ZC6-FLD9BHUTB/captura_de_ecra___2019-07-19__a__s_09.11.01.png▾

Good morning guys, I'm having this error on the iOS build since I have started using SQLDelight. I think it's because of when I added the classpath to the project build.gradle file, it asked me to remove the version of kotlin-multiplatform on the plugins task in the lib build.gradle. Maybe there are conflicting libraries?

Nicholas Bilyk

07/20/2019, 2:53 PM

Saturday morning troubles! I am publishing multi-platform libraries using the maven-publish plugin. It's set up in the default way that the kotlin multiplatform plugin configures the publishing. Everything is working as expected except that when I set them as dependencies, the source isn't included in IDEA. Source jars are being created properly, but the IDEA project structure doesn't see them. Any tips?

mbonnin

07/21/2019, 12:34 PM

What's the correct plugin to use in an Android module that uses other multiplatform modules ? https://github.com/Kotlin/mpp-example/blob/master/androidApp/build.gradle#L3 has

org.jetbrains.kotlin.multiplatform

and https://github.com/chris-hatton/kotlin-multiplatform-template/blob/master/Code/Client/Android/mobile/build.gradle.kts#L17 has

kotlin-android

Title

mbonnin

07/21/2019, 12:34 PM

What's the correct plugin to use in an Android module that uses other multiplatform modules ? https://github.com/Kotlin/mpp-example/blob/master/androidApp/build.gradle#L3 has

org.jetbrains.kotlin.multiplatform

and https://github.com/chris-hatton/kotlin-multiplatform-template/blob/master/Code/Client/Android/mobile/build.gradle.kts#L17 has

kotlin-android

Asking because I have a hard time having intelliJ picking up the multiplatform dependencies in my android app module (compilation works fine)

Dominaezzz

07/21/2019, 12:52 PM

Ha, was doing this yesterday. If you need to use both, use the multiplatform one.

mbonnin

07/21/2019, 12:57 PM

Does auto-complete work for you ? Some modules I can Ctrl-click into, other just stay red forever no matter how many times I gradle sync...

Dominaezzz

07/21/2019, 12:58 PM

It does.

Try re-importing the project.

mbonnin

07/21/2019, 1:00 PM

Yes, I've done that a few times... Right now I'm trying https://github.com/chris-hatton/kotlin-multiplatform-template but still got everything red (it's actually worse as intelliJ doesn't even pick up the androidx libs...) What intelliJ are you using ? (I'm using 2019.1 community)

Dominaezzz

07/21/2019, 1:02 PM

Same but Ultimate.

Is all of the source red or just some?

mbonnin

07/21/2019, 1:03 PM

Dominaezzz

07/21/2019, 1:03 PM

Ah, off course.

Had the same issue.

Show me your gradle sync output.

It's the dependency resolution issue you're talking about.

mbonnin

07/21/2019, 1:05 PM

Is that the sync output ? https://gist.github.com/martinbonnin/98ec2315474401e864ff1abad6d99ccc

:yes: 1

That doesn't mention much...

multiplatform projects are resolved by the IDE but Ctrl-click opens the decompiled class (and not the commonMain source file I would expect)

Dominaezzz

07/21/2019, 1:11 PM

Have you added

jcentre()

to your

repositories

block?

mbonnin

07/21/2019, 1:12 PM

It happens to be there (https://github.com/chris-hatton/kotlin-multiplatform-template/blob/96b78ed2237c7052c34b3ffe00ed3b573954732c/Code/Client/Android/build.gradle.kts#L33). But this is litteraly a clean checkout from the template project so I would expect it to work out of the box

Unless @darkmoon_uk does'nt have autocomplete either ?

Sergioedcigreja

07/21/2019, 1:14 PM

have you modified the sdk.dir on local.properties?

mbonnin

07/21/2019, 1:14 PM

yep, I have actually created local.properties, it wouldn't compile else

Dominaezzz

07/21/2019, 1:18 PM

Compiles? So you can run the project via the IDE?

mbonnin

07/21/2019, 1:18 PM

Yep

Everything compiles fine, it's just the IDE auto-complete that's messed up

Dominaezzz

07/21/2019, 1:21 PM

I don't see the androidx dependencies.

Nvm, found them

In the gradle window, try clicking the Refresh dependencies button.

mbonnin

07/21/2019, 1:24 PM

I have a "Refresh all Gradle project, is this it ?"

Dominaezzz

07/21/2019, 1:24 PM

No, there's another one.

mbonnin

07/21/2019, 1:25 PM

Can't find it...

Dominaezzz

07/21/2019, 1:26 PM

Right-click

mbonnin

07/21/2019, 1:26 PM

Yay, thanks !

What does that do ? re-download dependencies ?

louiscad

07/21/2019, 1:27 PM

It seems there's a problem with a dependency (according to the red underline). Trying to build from command line should show the problem with dependency resolution if there's one.

Dominaezzz

07/21/2019, 1:27 PM

Hmm, I'm not completely sure but it usually forces IntelliJ to reindex stuff an the end.

mbonnin

07/21/2019, 1:28 PM

So now I have androix resolved but

client-common

is all red now (it used to link to the decompiled class file)

@louiscad building is perfectly fine, it's just the IDE features not recognizing all the dependencies

louiscad

07/21/2019, 1:33 PM

@mbonnin Are the red classes from an

android

or a

jvm

target, or from a non Kotlin multiplatform module (and if so, android or jvm?)

mbonnin

07/21/2019, 1:35 PM

I believe they are from a

commonMain

sourceSet that is included as a jvm() artifact (does that make sense ?)

FirstPresenterContract

usages for an example are all red until I build and gradle sync. Then usages are not red anymore but Ctrl-click opens the .jar and not the source file. https://github.com/chris-hatton/kotlin-multiplatform-template/blob/121ef4fa3129d506245e4f5ca9b0ceb29e02f773/Code/Client/Common/src/commonMain/kotlin/org/chrishatton/example/ui/contract/FirstPresenterContract.kt#L4-L3

Dominaezzz

07/21/2019, 1:40 PM

Hmm, it's frustrating that the project builds. Is

client-common

itself red?

mbonnin

07/21/2019, 1:42 PM

Now that I built, red has disappeared but IDE features like Ctrl-click still don't work. The IDE looks up the symbols inside the jar and isn't able to understand that they actually come from a source module

Maybe I'll just try a free trial of the ultimate edition, never know...

louiscad

07/21/2019, 1:46 PM

Android Studio has a decompiler too, but that doesn't work well for non java sources, especially when you start using features like coroutines and things that Java can't express

Android Studio uses parts of Ultimate features, plus parts of CLion, which is paid by us through Google if I understood the business model well

mbonnin

07/21/2019, 1:47 PM

The thing is I don't care about the decompiler, I just want Android Studio, intelliJ, idea, ... to recognize that these source are in my project in an included module

louiscad

07/21/2019, 1:48 PM

But that won't solve your issue. I think you should report the issue on kotl.in/issue, ideally with a reproducing project. This should just work, that's the developer UX we aim for

👍 1

mbonnin

07/21/2019, 1:49 PM

But if it works for everyone else, it's going to be though to reproduce...

louiscad

07/21/2019, 1:56 PM

It doesn't always work well for me when I mix jvm and android targets. I reported an issue a while ago with different symptoms, but it got crowded as there was regressions then partial fixes. A fresh one with a narrow scope will always help. In my company's project, I use only

android

targets for now because of these kind of issues. I planned to try 1.3.50 EAPs on a personal project after I make a release with 1.3.40 soon, so I can see what improved and open new issues for the remaining issues I encounter. I'm also rounding the corners of a project template that bundles modules templates to generate modularized bug reproducers by reproducing the modules w/ targets and dependency graph, and generate other projects more quickly. I didn't encounter the behavior you describe, so I still strongly encourage you to report it. If you want me to help generate a reproducing project, feel free to reach me here or by DM, my modules templates + (Kotlin) script already work well, I finished

settings.gradle.kts

auto-editing last nigh.

mbonnin

07/21/2019, 1:59 PM

Ah, thanks for the jvm vs android thing, that might help. In this case, the reproducer is quite easy thanks to Chris: https://github.com/chris-hatton/kotlin-multiplatform-template

BTW, same thing with ultimate edition

https://youtrack.jetbrains.com/issue/KT-32814?project=kt

👍 4

louiscad

07/21/2019, 2:23 PM

Perfect! Voted for it

👍 1

mbonnin

07/22/2019, 10:06 PM

I ended up targetting android for all the modules and now everything's working fine. Here's the commit if you're curious: https://github.com/HearthSim/Arcane-Tracker/commit/2d652d678bdfd26e8eca779f9fd697e178c18ff6. It's a bit tedious to have to maintain all these AndroidManifest, etc...

darkmoon_uk

07/22/2019, 10:19 PM

Upvoted as this affects the template; thanks for raising the issue @mbonnin!

👍 1

louiscad

07/22/2019, 10:29 PM

Note that you can use

stdlib-jdk7

on Android. Maybe even

stdlib-jdk8

since D8 in AGP 3.4+? Can you confirm @jw Also, do you know if it automatically raises the Kotlin jvmTarget to 8, and if you need to set compileOptions for AGP for it to work properly?

07/22/2019, 10:39 PM

It has nothing to do with desugaring. It's more about types and APIs which you're already protected against by lint. Every Android dev should be using jdk8 stdlib and it's orthogonal to bytecode level (although I suspect the jdk8 one might target 8 which will force it on you)

mbonnin

07/22/2019, 10:52 PM

What do I get by using

stdlib-jdk8

instead of the plain

stdlib

07/23/2019, 12:44 AM

Not much. You won't use anything from it. 7 is where the suppressed exception support lives which you want. But you might as well use 8

👍 2

darkmoon_uk

07/23/2019, 8:51 AM

@mbonnin On the subject of my usage of the

kotlin-android

plugin instead of the

kotlin-multiplatform

plugin at the top-level; this was a considered choice. Considerations being: • Firstly, I would expect either

kotlin-android

kotlin-multiplatform

(with Android target) to ultimately work. • While there seems to be a perception that the multi-platform plugin is 'recommended'; I wasn't able to find any suggestion that the platform-specific plugins are deprecated in any way - they still have their place and are valid for use. • Creating an all-in-one multiplatform client project for the clients I wanted to support is currently problematic for the

multiplatform

plugin. Specifically: to include a JavaFX Desktop client would mean the

android

and

java

plugins both need to be instated, but they are currently mutually exclusive in the same Gradle file. • Anyway, the amount of configuration I have (or may want to expand to) would become too cluttered and disorganised in a single file. I feel that

multiplatform

driven projects are better suited to libraries and do not cater well to top-level application projects where there is a lot of extra configuration going on. • In summary: the Android client project in my template should be only ever target the Android platform - so

kotlin-android

is the best fit • Finally: My supporting library projects are

kotlin-multiplatform

- as the best fit for them

mbonnin

07/23/2019, 8:54 AM

Makes sense, thanks !

darkmoon_uk

08/12/2019, 12:41 AM

Added a follow up the issue of IntelliJ breaking when jvm/android targets are mixed, at: https://youtrack.jetbrains.com/issue/KT-32814

Looks related to (maybe even a duplicate of) https://youtrack.jetbrains.com/issue/KT-30510 ...which comment says should be fixed in AS 3.6 Canary 6.

👍 1

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