kotlinlang #android

Has anyone thought about having "empty" foreground service, i.e. not owning object references nor thread and having the object live "separately", where it emits its state, where some other code just starts / stops the service accordingly, for androids background (foreground) sake?

Santhosh

10/28/2018, 3:46 PM

is there any java android slack channel?can anyone please provide?

🇳🇴 5

hyunghui

10/28/2018, 4:29 PM

Hi my android library team is considering using Kotlin for our library, now it is pure java. It is not easy to convince all team members to start using it because if we start using Kotlin, users who use our library should take care of the Kotlin version in their apps to avoid Kotlin version conflict. If there are some use cases it will be helpful. Is there any library successfully applied Kotlin?

Soundlicious

10/29/2018, 3:38 AM

Anyone working with mvrx here? i'm using it with Android Navigation Component to display a view with bottomNavigation and two fragment. i would like to share an id to those two fragments, but i can't access the activity that contain them... bit lost here with that framework 😥

joeamrhein

10/29/2018, 4:07 PM

Is there a different way of specifying the following in Kotlin 1.3? I'm getting

This annotation is not applicable to target 'undefined target' and use site target '@param'

errors now

private fun foo(map: Map<String, @param:RawRes Int>) {}

adam-mcneilly

10/29/2018, 5:46 PM

I notice sometimes when people use libraries that have annotation processing like Room, they have both

kapt "..."

and

annotationProcessor "..."

. What is the reason for needing both?

10/29/2018, 8:00 PM

allprojects {
  tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile).all {
    kotlinOptions {
      freeCompilerArgs += [
          '-progressive'
      ]
    }
  }
}

in root

build.gradle

👍 3

skennedy

10/29/2018, 8:25 PM

you shouldn’t need any special configuration for kotlin

blyn

10/29/2018, 8:49 PM

AS is yelling at me after Kotlin 1.3, i’m assuming due to the new contracts:

private fun foo(value: String?) {
        var myString: String = ""

        if (!value.isNullOrEmpty()) {
            myString = value
        }
    }

IDE complains that there’s a type mismatch between

myString

and

value

, but the compile builds no problem (and warns if i explicitly

!!

). Is there anyway around this?

tonyng93

10/30/2018, 4:36 AM

Hey guys, is

kotlin-gradle-plugin:1.2.71

not compatible with

android-studio-3.4-canary-2

normal? Anyone facing the same issue?

tigran.babajanyan

10/30/2018, 8:41 AM

Hi all, how to implement coroutines UI and bg in kotlin 1.3?

👎 2

Zaidi

10/30/2018, 9:33 AM

if there any one who can read this article and suggest me is this the best approach to implement this https://medium.com/@skydoves/how-to-manage-sharedpreferences-on-android-project-5e6d5e28fee6

yperess

10/30/2018, 1:45 PM

Is there a way to use the new Kotlin contracts along with an API check? For example, I want to turn the following:

if (Build.VERSION.SDK_INT >= 23) {
    // Long code block
} else {
    throw IllegalAccessException()
}

Into:

if (Build.VERSION.SDK_INT < 23) throw IllegalAccessException()
// Long code block

ivano

10/30/2018, 4:43 PM

Are you familiar with mockk? I added in build.gradle:

testImplementation "io.mockk:mockk:1.8.9"

the sync works smooth, with no error messages,but if I try to write `val class =mockk<ClassWhatever> `I get an unresolved reference, the library is present, I have also tried to install apart Mockito, but does not work

robinchew

10/30/2018, 4:49 PM

message has been deleted

nick

10/30/2018, 8:33 PM

Is anyone else having trouble with android data-bindings with kotlin 1.3? I’m getting the following compile error:

* What went wrong:
Could not resolve all files for configuration ':myProject:debugAnnotationProcessorClasspath'.
> Could not find org.jetbrains.kotlin:kotlin-stdlib-jre8:1.3.0.
  Searched in the following locations:
    - <https://dl.google.com/dl/android/maven2/org/jetbrains/kotlin/kotlin-stdlib-jre8/1.3.0/kotlin-stdlib-jre8-1.3.0.pom>
    - <https://dl.google.com/dl/android/maven2/org/jetbrains/kotlin/kotlin-stdlib-jre8/1.3.0/kotlin-stdlib-jre8-1.3.0.jar>
    - <https://repo.maven.apache.org/maven2/org/jetbrains/kotlin/kotlin-stdlib-jre8/1.3.0/kotlin-stdlib-jre8-1.3.0.pom>
    - <https://repo.maven.apache.org/maven2/org/jetbrains/kotlin/kotlin-stdlib-jre8/1.3.0/kotlin-stdlib-jre8-1.3.0.jar>
    - <https://maven.fabric.io/public/org/jetbrains/kotlin/kotlin-stdlib-jre8/1.3.0/kotlin-stdlib-jre8-1.3.0.pom>
    - <https://maven.fabric.io/public/org/jetbrains/kotlin/kotlin-stdlib-jre8/1.3.0/kotlin-stdlib-jre8-1.3.0.jar>
    - <https://appboy.github.io/appboy-android-sdk/sdk/org/jetbrains/kotlin/kotlin-stdlib-jre8/1.3.0/kotlin-stdlib-jre8-1.3.0.pom>
    - <https://appboy.github.io/appboy-android-sdk/sdk/org/jetbrains/kotlin/kotlin-stdlib-jre8/1.3.0/kotlin-stdlib-jre8-1.3.0.jar>
    - <https://jcenter.bintray.com/org/jetbrains/kotlin/kotlin-stdlib-jre8/1.3.0/kotlin-stdlib-jre8-1.3.0.pom>
    - <https://jcenter.bintray.com/org/jetbrains/kotlin/kotlin-stdlib-jre8/1.3.0/kotlin-stdlib-jre8-1.3.0.jar>
  Required by:
      project :myProject > com.android.databinding:compiler:3.1.4
      project :myProject > com.android.databinding:compiler:3.1.4 > com.android.databinding:compilerCommon:3.1.4

10/30/2018, 8:54 PM

Also if you use Dagger with Kotlin, modularization will yield 10x performance improvements than incremental annotation processing (through granular local caching, higher hits on remote caching, compilation avoidance, stronger encapsulation, and parallelization)

👍 13

darkmoon_uk

10/30/2018, 9:06 PM

As a side note: the one development that is taking our local build time from 15 minutes down to 5 minutes (yes, really), is the V2 DataBinding compiler. See: https://www.reddit.com/r/androiddev/comments/9nru7j/data_binding_compiler_v2_in_android_studio_321/

Jakub

10/31/2018, 9:15 PM

Could you recommend me an open source project written in

Kotlin

that shows the best practices and implements authentication using

OkHttp Authenticator

Retrofit

, keeps

RefreshToken

KeyStore

and in general has well organised structure for the whole network layer?

tuan.lam

11/01/2018, 9:10 AM

Hi everyone, I have a problem, pls help to clear it. How multi coroutines work in cpu?

🙂 2

:google: 4

Jakub

11/01/2018, 5:55 PM

Sorry for the offtopic, but is there a place on the web where I can ask for the best practices for Android development?

Jakub

11/01/2018, 5:55 PM

*Not only Kotlin

igor.wojda

11/02/2018, 1:58 AM

How to enable

Data Binding

in Gradle Kotlin Script? Below config works perfectly for build.gradle (groovy), but results in

cannot access enabled: it is private in DataBingingOptions

error in build.gradle.kts (Kotlin Gradle Script)

android {
    ...
    dataBinding {
        enabled = true
    }
}

Mark

11/02/2018, 5:38 AM

Is there some sample code out there for a recyclerview adapter using

produce{}

(coroutines)

BMG

11/02/2018, 8:49 AM

I’m using Kotlin stdlib 1.3.0 and Kotlin Compiler 1.3. But still android studio IDE showing errors if I use anything above Kotlin 1.1 API like

rem()

. But gradle builds are working fine. What could be wrong here?

Shashank Gupta

11/02/2018, 9:10 AM

Hi Guys, I have a query regarding multi-threading in Kotlin. I have 3 streams and am combining them like this, A.withLatestFrom(B, C, { a, b, c -> }).subscribe { } where, A, B, C are PublishSubjects Operations perform inside subscribe { } are: - Accessing Database and fetch data - Process that data and create the list - This list is then pushed to Adapter to display the list Need: I want to run the operation in 2nd thread and finally push the list to main Thread Solutions tried: - used subscribeOn(Schedulers.computation) and observeOn(AndroidSchedulers.mainThread) - used hide() Please help!!!

Tolriq

11/02/2018, 10:03 AM

Yes but to be sure

Job() + Dispatchers.Main

create a new context and parent job? (The Android lifecycle part I master after all those years:p) and calling coroutineContext.Cancel() does cancel the parentJob and all the child + prevent new calls, and that coroutineContext.CancelChildren() only cancel running jobs for that context/job and allows queuing new ones?

Sergio Crespo Toubes

11/02/2018, 1:52 PM

@louiscad what are you using? anko for build the views?

🥁 1

Title

Sergio Crespo Toubes

11/02/2018, 1:52 PM

@louiscad what are you using? anko for build the views?

🥁 1

louiscad

11/02/2018, 2:09 PM

An alternative to anko. I'm still working on a breaking release right now (after months of work), so I'll ping you with the link after it's done (hopefully, finally today)

Sergio Crespo Toubes

11/02/2018, 3:38 PM

ok thanks you

Matt Rea

11/02/2018, 6:09 PM

there’s nothing wrong with using

findViewById

. Synthetic imports from xml just give you view caching. Not a huge benefit for most apps

➕ 1

you could also build a lazy delegate wrapper around

findViewById

pretty easily

so you could do

val view: View by viewFinder(R.id.view)

louiscad

11/02/2018, 6:11 PM

@Matt Rea I don't see the link with this specific thread, we're not talking about findViewById but Views without xml at all here

@Matt Rea Maybe you targeted the message just above the one that started this thread?

Matt Rea

11/02/2018, 6:12 PM

oooo I misunderstood what you were saying about ’moving away from xml`. Thought you were talking about moving away from synthetic imports, not xml altogether

nice! Interested to see your work when its finished

louiscad

11/02/2018, 10:57 PM

The alpha5 version of Splitties is now available on jcenter and is on the master branch on GitHub. I'm still writing the release notes, but you probably only need the updated documentation. So, to make UIs in Android, I use the View DSL split, and you can read the documentation and try it by following this link: https://github.com/LouisCAD/Splitties/blob/master/viewdsl/README.md There are not much examples at the moment (because I also have a day job), but the API and the doc is there.

:kotlin: 1

:kotlin-flag: 1

View count: 1