Hi. I'm relatively new to Coroutines. Is it okey to use

GlobalScope.launch { }

to run an infinite while to draw on canvas (Android SurfaceView) or it is a better solution ?

no

Ok, so I must run the coroutine attached to the lifecycle of the view.

so if you use global scope, your coroutine will continue to run when the view or activity is destroyed

Ok, and stop running only when the app is destroyed, is that ?

for example, if it were activity:

lateinit var onCreateScope: CoroutineScope
fun onCreate(){
  onCreateScope = CoroutineScope(Dispatchers.Main)  
}

fun onDestroy() {
  onCreateScope.cancel()
}

I found an exemple code (https://github.com/elye/demo_android_surfaceview_vs_view/blob/7ffb8481788b2b1eadd0da58536b92db1293f229/app/src/main/java/com/elyeproj/surfaceviewexplore/SlowSurfaceView.kt#L39) and it's seems that it's for an old version of couroutines, without notion of scopes

correct

It's still a bit unatural to have to define it explicitly, but I understand the concept, thanks for the help !

just make sure you switch to the main thread for main specific code

Like it, must spend more time on Coroutines

also, realize that

Dispatchers.Default

is a thread pool, so if you launch more than one coroutine you lose thread safety (any code confined to a single coroutine is thread safe, even if it runs across multiple threads)

Ok thanks, in my case it's Ok I guess.

yes, but the

IO

dispatcher is for blocking calls that don’t do any work while they block a thread