kotlinlang #android

Is the Layout Inspector supposed to work in IntelliJ IDEA Ultimate 2020.2? I just got back to some Android dev, updated my app to Kotlin 1.4, wanted to check something and the Layout Inspector just stays empty, nothing works, no error.

1 reply · 2 participants

Slackbot

11/17/2020, 4:41 PM

This message was deleted.

❌ 1

🇳🇴 1

3 replies · 4 participants

Serhii K

11/17/2020, 5:07 PM

com.android.tools.build:gradle:4.1.1 // And I updated gradle

:google: 1

1 reply · 2 participants

Kshitij Patil

11/18/2020, 3:48 AM

Does anyone have working example of Paging 3 with

RemoteMediator

? Especially the cases where we decide the page based on

loadType

and

state

. Also, where can I ask more Paging 3 related questions?

:stackoverflow: 2

2 replies · 2 participants

Elnur Jeksenov

11/18/2020, 4:47 AM

Hi guys👋 My project contains three modules: 1. app 2. ui(jetpack compose) 3. sdk(kotlin multiplatform, ktor client) So I’m making requests to server in sdk(kotlin multiplatform) module. I want to upload file via multipart-form-data, but there is no support for java.io.file in kotlin multiplatform. Have you got any idea to solve this problem?

2 replies · 2 participants

Slackbot

11/18/2020, 3:41 PM

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1 reply · 2 participants

Mitch

11/19/2020, 12:32 AM

Does compose chat go in this channel?

4 replies · 3 participants

Slackbot

11/19/2020, 2:49 AM

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:stackoverflow: 2

1 reply · 2 participants

Rengu N

11/19/2020, 2:53 AM

Hello, how do we specify build variant for kotlin multiplatform. Any specific examples are there?

1 reply · 2 participants

riflockle

11/19/2020, 8:01 AM

Is the CI system working well at

github actions

now? My kotlin style test, dependencyTest, Unit Test are very slow....

1 reply · 2 participants

Tim Malseed

11/19/2020, 10:45 AM

Something that just occurred to me after 8 years of Android programming.. How is Android's colour system integer based? If a colour is represented in hex format, with an alpha channel - it's quite possible (and common) for the resultant decimal value to be Long. That colour value is then cast to integer, and overflows. How does Android's colour system work with overflowed integers? Are there any collisions? Could two different colours end up overflowing to the same value? Or is the explanation just that it's possible to map from the overflowed integer, back to the long value, because the set of possibilities is limited from 0x00000000 to 0xFFFFFFFF (there are no collisions)

:google: 3

:stackoverflow: 3

15 replies · 6 participants

kenkyee

11/19/2020, 12:46 PM

Maybe rename this channel to #android-kotlin-questions-only So it's not #android-questions-that-belong-on-stackoverflow 😂

:stackoverflow: 1

👍 4

17 replies · 8 participants

Eric Ampire [MOD]

11/19/2020, 2:22 PM

After removing

apply plugin: 'kotlin-android-extensions'

I tried to add Kotlin parcelize plugin

apply plugin: 'kotlin-parcelize'

but after adding parcelize plugin a got this error message

Plugin [id: 'kotlin-parcelize'] was not found in any of the following sources:

Can someone explain why?

3 replies · 2 participants

Ryan

11/19/2020, 3:43 PM

anyone know keyboard shortcut to show most recently visible class/file?

:google: 2

21 replies · 4 participants

Orhan Tozan

11/19/2020, 4:08 PM

Anyone else find the naming of

lifecycleScope.launchWhenStarted {}

misleading?

lifecycleScope.launch { ... }

-> launches the coroutine immediatly, gets canceled when lifecycle is destroyed. Now I would expect

lifecycleScope.launchWhenStarted { ... }

to behave the same as the above, except it being different in the timing of the coroutine launching: coroutine gets launched when the lifecycle is started, and gets canceled when lifecycle is destroyed. But what it actually does, is also suspend the coroutine after it is launched, when the lifecycle is stopped. Maybe I've misunderstood it, but if not, I think a more fitting name would be something like

lifecycleScope.runWhileStarted {...}

? Or maybe perhaps a whole new scope? (

lifecycleStartedScope

), It feels like these

launchWhen

methods try to emulate sub-coroutinescopes that could be replaced by introducing new lifecyclescopes that are different instances of CoroutineScope, an API that exists for handling the lifecycles of coroutines. Curious to hear your thoughts about this.

👍 5

9 replies · 6 participants

Brady Aiello

11/19/2020, 5:18 PM

Haven't had this problem before, but I can't build an Android project at all, from terminal or Android Studio. It just hangs forever, and --info isn't particularly helpful. I'm using Kotlin 1.4.10, Kotlin Gradle DSL, Android Studio 4.2 Canary 16. Anyone have this problem? I'll add a couple interesting logs in a thread.

4 replies · 3 participants

Corey Lanier

11/20/2020, 2:29 AM

Hi all, I’m studying MVVM, and having a hard time grasping why a ViewModelFactory would go with a ViewModel when it is sent to a fragment. I’ve seen the ViewModel work standalone as well, so I’m just wondering what benefit using a ViewModelFactory provides. And yes, I’ve been to SO and Google, and yet I still don’t fully grasp the concept, so shoot me.

:google: 4

:stackoverflow: 4

4 replies · 2 participants

Slackbot

11/20/2020, 7:03 AM

This message was deleted.

:google: 2

:stackoverflow: 2

👍 1

1 reply · 2 participants

Alexa_Gal

11/20/2020, 7:34 PM

have anyone here worked with the google-pay lib from google (the one provided to banks/fintechs) that could help me with a tiny issue 👋

1 reply · 2 participants

Gabriel Brollo

11/20/2020, 11:50 PM

Hello, AndroidViewModel.getApplication() was accepted for boolean parameter, and i have only a runtime exception. Is that a problem with generic function? But it should extend a Application class

16 replies · 4 participants

Val Salamakha

11/21/2020, 12:08 AM

I use AS-4.2-alpha16. When I started debug mode, I received the following message: “Could not connect to remote process. Aborting debug session.” The studio works fine in the Run mode. What is going on?

3 replies · 2 participants

Rahul Mishra

11/22/2020, 12:41 AM

Hi Devs, Have we encountered this kind of issue when working with dagger-hilt in multi module project? https://stackoverflow.com/questions/64949553/multiple-activity-annotated-as-androidentrypoint-in-different-modules-with-hilt Please have a look. Would be great help. Thanks. 😃

2 replies · 2 participants

Priyank Jain

11/22/2020, 11:00 AM

Hello all. I am developing a karaoke application in which user can sing with the background music with both video and audio. It is just like one popular application on the Play store StarMaker. But the thing is I am unable to find any library which can do recording and playback with live feedback of own voice in-ear, with music and voice synchronization. StarMaker is actually doing that all of that in realtime. So can anyone tell me about any library or any source from where I can develop a karaoke application?

:google: 4

1 reply · 2 participants

Alessandro Toninelli

11/22/2020, 12:24 PM

hi, i am having problems with the latest update of android studio for mac. every time I open the Preferences or any other window android studio split the current window by creating tabs and freezing the entire ide! Others with the same problem? Solutions?

4 replies · 2 participants

Jonny

11/22/2020, 1:39 PM

Do I definitely need to get my viewmodel from a viewmodelprovider? Right now I'm doing it like this:

@Provides
    @MainScope
    fun contributeViewModel(isSignedInUseCase: IsSignedInUseCase, signOutUseCase:SignOutUseCase, toolbarViewConfig: ToolbarViewConfig): MainActivityViewModel =
        MainActivityViewModel(isSignedInUseCase, signOutUseCase, toolbarViewConfig)

and then I build it in MainActivity using my builder, and then I can access the viewmodel there.

interface MainComponent {
    fun mainViewModel(): MainActivityViewModel
    fun navController(): NavController

    @Component.Builder
    interface Builder {
        fun build(): MainComponent

        @BindsInstance
        fun activity(activity: AppCompatActivity): Builder
        fun coreComponent(coreComponent: CoreComponent): Builder
    }

}

Am I missing something? Will the viewmodel not be provided to me in the same way using this method? Here's how I use it in MainActivity:

mainComponent = DaggerMainComponent
            .builder()
            .coreComponent(coreComponent)
            .activity(this)
            .build()

        mainActivityViewModel = mainComponent.mainViewModel()

🤦‍♂️ 3

1 reply · 2 participants

Slackbot

11/22/2020, 3:23 PM

This message was deleted.

🤦‍♂️ 1

2 replies · 3 participants

Lilly

11/23/2020, 2:43 AM

Hi, I owned a project which is from 2012 and it is really messy. It's not clear which

Activity

belongs to which screen. Is there a faster way than setting break points arbitrarily to determine this?

🤔 2

5 replies · 3 participants

dammy_abayomi

11/23/2020, 1:11 PM

Hi everyone, I’m exploring the possibility of connecting Coroutine

StateFlow

🤝

DataBinding

in a similar way as

LiveData

do. It seems there isn’t a default implementation at the moment that supports it. I found an example online which seems quite “burdensome” if one needs to implement it for a bigger project https://github.com/STAR-ZERO/sample-stateflow-databinding Do you use

StateFlow

🤝

DataBinding

? How do you connect them?

8 replies · 4 participants

Nikita Khlebushkin

11/23/2020, 1:48 PM

Hello! I updated to 1.4.20, and now all my synthetic views are highlighted red, without any code suggestion or quick documentation (it all builds ~~and work fine though~~). How do I get the code completion back?

👍 1

37 replies · 4 participants

Ben Butterworth

11/23/2020, 5:17 PM

Is there a way to wrap an iterator inside a custom iterator? I want to do some logic before returning the values from an iterator, but encapsulate it. A naive approach I tried,

myMapObject.asSequence().map {
  yield Pair(it.key, processValue(it.value))
}

but the iterator method

override fun next(): Pair<String, OutputType> {}

doesn't return sequences, but the actual value. My understanding of yield is that it needs to be inside a coroutine, so yield isn't really what im looking for? (im taking cues from the python yield keyword, which is very different)

8 replies · 2 participants

Title

Ben Butterworth

11/23/2020, 5:17 PM

Is there a way to wrap an iterator inside a custom iterator? I want to do some logic before returning the values from an iterator, but encapsulate it. A naive approach I tried,

myMapObject.asSequence().map {
  yield Pair(it.key, processValue(it.value))
}

but the iterator method

override fun next(): Pair<String, OutputType> {}

Vampire

11/23/2020, 5:33 PM

Nowhere in your approach is any iterator involved. And

yield

is not necessary here, it would allow you to produce values for an arbitrary sequence. It is a suspending function, so it has to be called from a suspending function: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.sequences/-sequence-scope/yield.html If you for example use the

sequence

function, the lambda you give it is a suspending function, so you can call

yield

in it: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.sequences/sequence.html But as you just want to map the elements of an existing sequence,

yield

is not what you are after, just omit it and you have what you want.

Ben Butterworth

11/23/2020, 5:36 PM

Sorry, i omitted the Iterator code, but this currently sits inside

override fun next(): Pair<String, ObjectType> {}

it cant return a sequence, which is why it wont work. I want it to be an iterator so clients can call each item independently. Unless this is also possible with sequences?

Vampire

11/23/2020, 5:39 PM

Sequences are the lazy Kotlin variant of iterators. Much like `Stream`s in Java. https://kotlinlang.org/docs/reference/sequences.html

Ben Butterworth

11/23/2020, 5:42 PM

Yes i know, i think asking about sequences was a redherring in my question. thats not my problem/ solution. It was just my first attempt which i discarded My main objective is to wrap an iterator with more logic, and the clients can use this iterator.

Having said that, i might as well change the clients to use a sequence, because i dont know how to encapsulate an iterator with extra logic.

Vampire

11/23/2020, 5:49 PM

There are many ways, at least one indeed involves sequences, like for example

myMapObject.asSequence().map { Pair(it.key, processValue(it.value)) }.iterator()

But if your client is using Kotlin, maybe using sequences is actually the better idea.

Ben Butterworth

11/23/2020, 5:51 PM

Ohh, thats a nice solution 😃, i was creating a nested Iterator subclass (boiler plate code)… and even that was not working. Thanks

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