kotlinlang #android

I have begun using coroutines together with retrofit and added the call adapter to my retrofit builder. However whenever i put the device into flight mode and try to make a request it crashes the app with an exception that seems to be internal.

Fatal Exception: java.net.UnknownHostException

and

Fatal Exception: java.net.SocketTimeoutException

anyone that has had a similar issue before?

itnoles

05/20/2019, 6:38 PM

Android 3.5 Beta 2 added warning to open up with kts.

Gautam Lad

05/23/2019, 2:08 PM

the reason i didnt try it is because the docs said:

// alternatively - Lifecycles only (no ViewModel or LiveData). Some UI
    //     AndroidX libraries use this lightweight import for Lifecycle
    implementation "androidx.lifecycle:lifecycle-runtime:$lifecycle_version"

czuckie

05/24/2019, 9:29 AM

gradle should be only executing tasks it needs to execute; the problem is when you want to have code coverage and you end up building with coverage enabled and then with coverage not enabled. I typically do compilation of instrumented classes upfront (quick verification the app compiles) and then run the tests. Then after tests have executed successfully, disable coverage and build all the product variants/flavours

Willy Njundong

05/25/2019, 3:13 PM

Can anyone point me to relevant docs?

Fredrik Larsen

05/27/2019, 10:41 AM

Hi, I'm having an issue building a release build

More than one file was found with OS independent path 'META-INF/core-ktx_release.kotlin_module'

Yes, I have a module named

core-ktx

and I'm guessing some other library has the same? I know you can exclude or pickFirst under packagingOptions, but I'm afraid that that will break something. As far as I know the

kotlin_module

is actually used by kotlin for various tasks. What is the proper solution here? I can rename the module, but this issue is bound to happen again. I find it peculiar that FQN is not used for this, but it's a bit over my head.

Willy Njundong

05/28/2019, 2:41 AM

public class MainActivity extends Activity implements SurfaceTextureListener

Loránd

05/28/2019, 9:10 AM

This might be an offtopic question but does anyone know what we are supposed to use now for implementing biometrics in our apps? The fingerprint manager is deprecated along with its permission and the androidx.biometric lib is still alpha.

👌 1

Slackbot

05/28/2019, 7:06 PM

This message was deleted.

K0NN4

05/28/2019, 11:14 PM

https://gyazo.com/068de3e8367ca5bccdd73cfbdef42833 Why

CLIENT_ID

and

REDIRECT_URI

are

Unsresolved references

Willy Njundong

05/29/2019, 6:59 AM

I can't quite understand what this syntax is:

private val surfaceTextureListener = object : TextureView.SurfaceTextureListener {

        override fun onSurfaceTextureAvailable(texture: SurfaceTexture, width: Int, height: Int) {
        //...
    }

Willy Njundong

05/29/2019, 7:27 AM

Is there any sort of difference I should be looking out for here:

if (permission != PackageManager.PERMISSION_GRANTED)

if (permission == PackageManager.PERMISSION_DENIED)

Alf_

05/29/2019, 8:39 AM

Does anyone know how to do this in Kotlin?

K0NN4

05/29/2019, 10:16 AM

I am trying to follow this tutorial: https://tolkiana.com/how-to-use-spotifys-sdk-in-kotlin/ But My code says that function

connect

Unresolved reference

: https://gyazo.com/3d631c4c65501d0ac6025ecb63cdb74c Here is "SpotifyService" class: https://gyazo.com/ae55413d281f65b56abfcd2e3823a79f

fradiati

05/29/2019, 11:01 AM

is there any good exaple to do this?

abicelis

05/29/2019, 8:22 PM

Hey community, I've been trying to update my Gradle

build

and

settings

files to KotlinDSL (Mainly following this guide: https://antonioleiva.com/kotlin-dsl-gradle/) which recommends using a buildSrc Gradle module. Everything seems to be working and gradle builds fine, however, I'm getting this warning:

WARNING: Unsupported Kotlin plugin version.
The `embedded-kotlin` and `kotlin-dsl` plugins rely on features of Kotlin `1.3.11` that might work differently than in the requested version `1.3.31`.

rajatarora2812

05/30/2019, 3:47 AM

Hi. Can someone please answer this Why kapt plugin is required for annotation processor in koltin?

Ive Vasiljevic

05/30/2019, 11:09 AM

Can anyone explain what is by activityViewModels(), by fragmentViewModels(), by existingViewModels() and so on used for. I get the idea that by activityVideModels() is used for shared viewModels between mutliple fragments that need to use data from the same viewModel, but how does it work..Do I actually need to extend activity with that viewModel or what? Do I need to specifiy viewModel factory or not?

Ive Vasiljevic

05/30/2019, 1:06 PM

In Android Kotlin is it better to use Enums or StringDef, IntDef annotations

oday

05/30/2019, 7:22 PM

simpleUML, PlantUML, none seem to be budging

Tuan Kiet

05/31/2019, 7:46 AM

and what are those

kotlin_module

for?

prateek aggarwal

05/31/2019, 2:22 PM

Hello everyone , we are using sqlBrite and I was trying to add colum for particular table but I am facing some weird issue related to kotlin code gen. We are using "org.jetbrains.kotlin:kotlin-stdlib:1.3.31"

That_Issue___.txt

gabrielfv

05/31/2019, 6:10 PM

For some reason

run<MyActivity> { ... }

can be read as calling the fragment version

Allan Wang

06/04/2019, 12:37 AM

Does anyone have a multi module project with a kotlin gradle plugin? I have an existing plugin (https://github.com/AllanWang/KAU/tree/dev/buildSrc) and I’d like to convert it to use kotlin, but I seem to be missing some dependencies. Looking at other examples online (https://www.klg71.de/post/kotlin_gradle_plugin/), it seems like adding the kotlin plugin should fix it, but I’m getting more errors which makes me believe my root build gradle is wrong

Sean Massie

06/04/2019, 3:56 AM

Hey everyone, I've been working with Kotlin in back end services for a while now and absolutely love it. I've been interesting in the android side of things and was wondering. What are the best resources (Books, courses) which focus more on learning android and less teaching Kotlin basics.

ghosalmartin

06/04/2019, 12:59 PM

not strictly Kotlin only but is there any issue with not recycling TypedArrays if it can be helped, will they be gc down the line either way?

Vague

06/04/2019, 1:57 PM

Should I use DataBinding in a RecyclerView? Or is it an overkill?

Title

Vague

06/04/2019, 1:57 PM

Should I use DataBinding in a RecyclerView? Or is it an overkill?

escodro

06/04/2019, 1:58 PM

In the component or in the items? In the RecyclerView itself, it may be not necessary. But in the items is a good call to avoid ViewHolders.

You can use a more generic solution for all Adapters with Data Binding. https://github.com/igorescodro/alkaa/blob/master/app/src/main/java/com/escodro/alkaa/common/databinding/BindingHolder.kt

Vague

06/04/2019, 2:05 PM

Using it in place of findViewById...

escodro

06/04/2019, 2:07 PM

You can simply use Kotlin Synthetic access for it. Or wait for the new View Binding. 😊

➕ 1

Vague

06/04/2019, 2:11 PM

Meh, yeah... Kotlin Synthetic in comparison to DataBinding, any performance difference or tradeoffs?

escodro

06/04/2019, 2:13 PM

That was shown in Google IO. The "???" Is the new View Binding.

Vague

06/04/2019, 2:17 PM

I'm guessing it's not stable yet?

escodro

06/04/2019, 2:24 PM

No, it is not. I would go with Synthetic if you only need the

findViewById

. Data Binding seems like a overkill.

Vague

06/04/2019, 2:28 PM

Okay... Thanks

😊 1

rook

06/04/2019, 4:15 PM

My information might be out-of-date, but one consideration you might make is that synthetics in `ViewHolder`s have to be re-evaluated every time it is reused. This can affect performance

👍 1

ghedeon

06/04/2019, 4:31 PM

isn't it what

LayoutContainer

for? Iirc it will be cached.

rook

06/04/2019, 7:16 PM

You’re correct. I wasn’t aware of

LayoutContainer

until you mentioned it. Relevant docs: https://kotlinlang.org/docs/tutorials/android-plugin.html#layoutcontainer-support

Sergio C.

06/04/2019, 10:43 PM

What's the objective of layout container?

View count: 5