Noob question. I'm using Android Studio (android development) I've Included dependencies:

implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.4.2"

But I cannot use

async

and

launch

in a

suspend fun

suspend fun foo() {
  async {} // Unresolved reference
  launch {} // Unresolved reference
}

What am I missing here?! EDIT: nevermind, I was remembering it wronly, I need something like

coroutineScope {}

or

withContext(...)

or something like that

async and launch are extension functions on CoroutineScope - you cannot call them without it

I'm inside a

suspend fun

Are you in the same module which that is imported?

yes, it's an android app

I haven’t use that dependency, we use here:

"org.jetbrains.kotlinx:kotlinx-coroutines-core:${Versions.coroutines}"

implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation "org.jetbrains.kotlin:kotlin-reflect:$kotlin_version"
    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.4.2")
    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.4.2"
    testImplementation "org.jetbrains.kotlinx:kotlinx-coroutines-test:1.4.2"

buildscript {
    ext.kotlin_version = '1.4.21'
    repositories {
        google()
        jcenter()

    }
    dependencies {
        classpath 'com.android.tools.build:gradle:7.0.0-alpha03'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath 
    }
}

Why does it matter that you are inside suspend function?

cause the scope is that coroutine? it is supposed to create a child coroutine

oh is it some android thing then?

why would it be? this is Kotlin, as far as I know there's no "android" kotlin, there's just kotlin

Can you please point me to some resource showing this? I am a bit lost

I've no idea what you are asking about @Milan Hruban

@Daniele Segato some code sample ideally in kotlin docs, that shows usage of

async

or

launch

in suspend function, without coroutine scope

I also think it never was possible. Also here: https://kotlinlang.org/docs/composing-suspending-functions.html#structured-concurrency-with-async

I checked coroutines a while ago, studied it than had to do something else and now i'm getting back to it. I still didn't build hours of work on it

well it depends what you want to do - the docs will probably explain it better then me

I see, I was probably remembering wrongly... I always used some kind of container for that.... so now I've another question about testing, doing it in another thread.

It was possible more that 2 years ago, before 1.0 release -> https://elizarov.medium.com/structured-concurrency-722d765aa952 (it also explains why it is not allowed now)

@elizarov ye, sorry, I actually rewatched that part and realized it... My bad, unfurtunately I spent time to study coroutines and try them out a couple of months ago, than I suspended cause I needed SharedFlow and needed to finish a project. Now I'm taking it up again more seriously and I just miss-remembered that. Thanks for your answer!