kotlinlang #touchlab-tools

in the shared code. Wondering if that is needed for avoiding any concurrency issues on native or is it because android ends up using the standard android

ViewModel

component and we are trying to create a VM for Native with almost the same functionality except android specific one. Another query I had was, if instead of doing a MVVM architecture, if I create a project structure in MVP(going a bit old school), can I put both my Model and Presenter in common code and avoid creating 2 different ViewModels that are platform specific. Considering KaMP kit uses MVVM, I am sure this debate would have come up in the past and would be very glad if you could share its outcome and avoid me some future pains 😂.

David Chavez

07/15/2020, 7:25 AM

Hey all, is there a way to specify for a cocoapod to only be linked and not have cinterop run? Context: I've run into a lib that requires this -- but they assume you use their cocoapods plugin (which I'd rather not do if it can be helped).

Peter Kucera

07/16/2020, 10:27 AM

Hey all, pls is there some alternative of Thread.current.name or Thread.stacktrace in Kotlin/Native?

Peter Kucera

07/20/2020, 2:54 PM

Hi all, quick one - How do you manage your enviroments while using KMP? Is there a way to define build variants so they are accesible even in commonMain? Thanks.

Alex Trotsenko

07/24/2020, 10:36 PM

Hi, I am trying to request KMP starter kit via https://touchlab.co/kamp-kit-touchlab/, but I am constantly getting "Subscription Error: An error occurred, please try later.". Does anyone know what might be wrong or how to fix this issue?

Peter Kucera

07/28/2020, 10:15 AM

I’m implementing FIFO Queue in Kotlin/Native, and I need to add elements to back and front of the queue. Is there some thread safe collection that allows this in Kotlin/Native? In Kotlin/JVM I would use e.g. ConcurrentLinkedDeque.

Daniele B

08/07/2020, 1:15 PM

I have a question about platform-specific libraries. For example Ktor. Let’s say, I use Ktor only in the shared project. And the shared project just has “CommonMain”. So, it doesn’t have neither “AndroidMain” nor “IosMain”. All the shared code is written in CommonMain and it’s perfectly compatible for both. There is not expect/actual implementation. In such case, do I still need to add platform-specific libraries such as “io.ktor:ktor-client-core-jvm”. And considering “AndroidMain” doesn’t exist, should I add it in “CommonMain” sourceset?

Alberto

08/10/2020, 4:28 PM

I'd like to create some interfaces in the common shared code that will be implemented in platform specifics code (Android/iOS either via expect/actual, but more likely interfaces implemented in separate packages). What would be the best way to pass in Platform specific objects, for example Context / Activity in Android, and equivalents in iOS? I'd imagine this could be a quite common scenario, didn't find an example on the Kamp Kit app (unless I've missed it).

Daniele B

08/12/2020, 11:33 AM

@russhwolf I had a look at your multiplatform-settings library and it seems very interesting. I was browsing the sample you have in Github and I can see that you defined the settings in the commonMain, but you are instantiating it in the specific-platform app code. I am actually trying to do something a bit different. I have written a ViewModel (and a DataRepository) in CommonMain, while on the platform-specific app code I only keep the UI layer (JetpackCompose in Android and SwiftUI in iOS, then I am planning to use Vue.JS for Web). So in my case the DataRepository is fully on CommonMain. I would like to find a way to connect the MultiplatformSettings to the DataRepository. So I am not looking to instantiate MultiplatformSettings in each platform-specific app code, but just on the shared code, as any data coming from there it would populate the ViewModel, which is shared among all platforms. I wonder if MultiplatformSettings would work in this way too. Clearly, as the Settings Android constructor requires the applicationContext to be passed, I need to find a way to pass the context to the DataRepository where I want to instantiate Settings. As you understand, I am very new to the whole multiplatform thing. Do you have any sample that could explain how to do that in the shared code (in case it’s a feasible thing) ?

Daniele B

08/12/2020, 11:47 AM

I can see KampKit uses MultiplatformSettings in another different way. Settings are defined in AndroidMain and IosMain, but they are instantiated in the platform-specific app code via Koin.

romtsn

08/19/2020, 1:28 PM

hi guys, I am trying to integrate sqldelight with sqlcipher on ios - I’ve gone through your article and did everything like suggested (building a static framework with sqlcipher pod as a dependency), but now am facing a weird issue - it looks like this works from code, so I can do some operations over a database (at least the last_changed_date in the file system changes), but when I try to open the db file with the db-browser or decode via sqlcipher-cli the password does not seem to work, so I cannot access the data. Could this be due to the recent fix which is not yet released in sqliter? Or is the db encrypted with some different algorithm than the default one for sqlcipher 4.+? Here is my database config just in case:

val dbConfig = DatabaseConfiguration(
            name = "name.db",
            version = MyDb.Schema.version,
            create = { connection -> wrapConnection(connection) { MyDb.Schema.create(it) } },
            upgrade = { connection, oldVersion, newVersion ->
                wrapConnection(connection) {
                    MyDb.Schema.migrate(it, oldVersion, newVersion)
                }
            },
            basePath = customDirPath,
            key = key,
            journalMode = JournalMode.DELETE
        )

Thanks!

kpgalligan

08/24/2020, 1:38 PM

Multithreaded coroutines doesn’t always play nice with the freezing stuff. The second block…

withContext(Dispatchers.Default) {
            log.e { "Never get's executed" }
            log.e { "Never called" }
        }

references

log

, which is a field of

BreedModel

. That will cause

BreedModel

to freeze when coroutines tries to run that block on a different thread. That happens inside of coroutines “machinery”, which prior to native, didn’t really expect passing state between threads to throw exceptions.

ensureNeverFrozen()

is new and coroutines hasn’t always dealt with it properly. I’ve seen some bugs submitted about it. Also, look at other output and see if you see anything about coroutines and “machinery”. Sometimes you will see that.

Ivann Ruiz

08/27/2020, 7:17 PM

Hey, been playing around with KaMPKit since yesterday and noticed that the

androidMain

folder in the android view doesn't show. However, I can see that folder when I switch to the project view. Do you all see the same? it should be visible in the android view as well...

zsperske

08/31/2020, 1:50 AM

I was taking a look at the

iOSTest

directory and noticed there isn't a corresponding block in the build.gradle, are its dependencies inherited from

iOSMain

or am I missing something?

Daniele B

08/31/2020, 3:15 PM

Currently just testing multiplatform on Android (not iOS or Web yet). I would like to clarify the configuration of coroutines and ktor. In the KaMPKit,

androidMain

has

org.jetbrains.kotlinx:kotlinx-coroutines-android

, but in my project it seems to compile also without specifying it. However it doesn’t compile if from

androidMain

I remove

io.ktor:ktor-client-android

. Can anyone give an explanation? Is there a reason why Ktor requires the android-specific library and coroutines doesn’t?

Daniele B

08/31/2020, 3:31 PM

One other source of confusion is Kotlin serialization. Sometimes specified as

kotlin-serialization

and sometimes as

kotlinx-serialization

. I have seen it specified in different ways: 1) as

plugins{ id("kotlinx-serialization") }

in *common*’s build.gradle.kts file 2) as

plugins{ kotlin("plugin.serialization") }

in *common*’s build.gradle.kts file 3) as

kotlin{ sourceSets{ dependencies{ implementation("org.jetbrains.kotlinx:kotlinx-serialization-core) }}}

in *common*’s build.gradle.kts file 4) as

buildscript{ dependencies{ classpath("org.jetbrains.kotlin:kotlin-serialization") }}

in project-level build.gradle.kts file

Peter Kucera

09/01/2020, 12:40 PM

Hey all, what is the best way of implementing functionality similar to JVM Collections.synchronizedList only by using Kotlin/Native? Thanks! https://developer.android.com/reference/java/util/Collections#synchronizedList(java.util.List%3CT%3E)

Daniele B

09/01/2020, 2:53 PM

is the newly announced JetBrains Kotlin Multiplatform Mobile plugin going to do everything which was previously done by TouchLab Xcode plugin, or there are still reason to install the latter?

Peter Kucera

09/04/2020, 3:40 PM

Hey all, please what version of Android Studio do you use to build projects based on Kampkit? Is Kampkit working well on AS 4+?

Ian Arbuckle

09/05/2020, 1:38 PM

Hey guys. Any progress on the current issue with adding

ios()

target? https://github.com/touchlab/KaMPKit/issues/133

👍🏽 1

Peter Kucera

09/15/2020, 3:52 PM

Hey all, is there some way to share also resources like colors/themes using KMP shared module? Have you tried to move colors to shared? Thanks

kpgalligan

10/15/2020, 1:51 PM

buildscript {
    repositories {
        google()
        mavenCentral() //<-- This
        jcenter()
    }
    dependencies {
        classpath(Deps.android_gradle_plugin)
        classpath(Deps.SqlDelight.gradle)
        classpath(Deps.cocoapodsext)
        classpath("org.jetbrains.kotlin:kotlin-serialization:${Versions.kotlin}")

        classpath(kotlin("gradle-plugin", Versions.kotlin))
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build gradle files
    }
}

kpgalligan

10/16/2020, 7:50 PM

This is a little out of “kampkit” territory, but I guess is this on a new db? This error basically says you’re violating foreign key constraints.

Reshadf

11/13/2020, 12:36 PM

hello is it possible to keep our existing iOS and Android projects in separate repos while having the Kotlin Shared Library as a separate repo?

Peter Kucera

11/16/2020, 1:28 PM

Hi guys. I have written UseCases using Observables (for logic that emits values) and then Completables(Logic that only has to be executed and doesnt return value, e.g. InvalidateDataUseCase). Currently I am migrating this implementation from RxJava to coroutines & Kotlin/Native. My question - what is the best way to replace Completables using coroutines and write alternative to CompletableUseCases inside shared?

CamiloVega

12/17/2020, 8:39 PM

Has anyone had issues debugging on android studio? Trying to set a breakpoint on the Breed model, and the IDE says Breakpoint does not belong to any Class Debugging works on the Activity and the view model

kpgalligan

12/29/2020, 4:07 PM

Mt coroutines supports background dispatchers, including Dispatchers.Defaut. data passed between threads is frozen, just fyi

🙌 1

Paul Woitaschek

02/04/2021, 8:23 AM

The stately iso collection release 1.1.1 is missing. https://mvnrepository.com/artifact/co.touchlab/stately-iso-collections When I use 1.1.1-a1, it fails to build with:

e: Supertypes of the following classes cannot be resolved. Please make sure you have the required dependencies in the classpath:
    class co.touchlab.stately.collections.IsoMutableMap, unresolved supertypes: co.touchlab.stately.isolate.IsolateState

It seems it has no dependency on

stately-isolate

Lena Stepanova

02/10/2021, 1:45 PM

Hi, I'm wondering if there is a way to implement something like suspend fun Transacter.transactionWithContext, but that would return result. I tried something like this, but I feel stuck In Couroutine Extensions:

suspend fun <T: Any> Transacter.transactionWithContextResult(
    coroutineContext: CoroutineContext,
    noEnclosing: Boolean = false,
    body: TransactionWithReturn<T>.() -> T
): T {
    return withContext(coroutineContext) {
        this@transactionWithContextResult.transactionWithResult(noEnclosing) { body }
    }
}

Using in DatabaseHelper:

suspend fun getAllItems(): List<Item> {
    dbRef.transactionWithContextResult<List<Item>>(backgroundDispatcher) {
        dbQueries.getAllItems(::mapItemsSelecting).executeAsList()
    }
}

Title

Lena Stepanova

02/10/2021, 1:45 PM

suspend fun <T: Any> Transacter.transactionWithContextResult(
    coroutineContext: CoroutineContext,
    noEnclosing: Boolean = false,
    body: TransactionWithReturn<T>.() -> T
): T {
    return withContext(coroutineContext) {
        this@transactionWithContextResult.transactionWithResult(noEnclosing) { body }
    }
}

Using in DatabaseHelper:

suspend fun getAllItems(): List<Item> {
    dbRef.transactionWithContextResult<List<Item>>(backgroundDispatcher) {
        dbQueries.getAllItems(::mapItemsSelecting).executeAsList()
    }
}

romtsn

02/11/2021, 9:04 AM

I guess it’s a better question for #squarelibraries but what exactly does not work here? The type cannot be inferred I assume?

Lena Stepanova

02/11/2021, 9:08 AM

romtsn

02/11/2021, 9:09 AM

you have to invoke your

body

actually, so change it to either

body.invoke()

or just

body()

Lena Stepanova

02/11/2021, 9:11 AM

🤦‍♀️ Thanks! I'll give it a try later :)

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