Is it possible to write tasks in Kotlin in buildSrc without

Question

Is it possible to write tasks in Kotlin in buildSrc without migrating to DSL

mbonnin · Answer

Yes it should work fine

ghedeon · Answer

hm It s highlighted but it stops working after I convert it to Kotlin Ex Java ``` package com foo public class Fun public static void sayHello System out println Hello ``` Usage ``` task hello doLast com foo Fun sayHello ``` That works Once I convert `Fun` to kotlin it can t import it anymore

mbonnin · Answer

Did you configure kotlin in `buildSrc build gradle`

ghedeon · Answer

yes like this ``` plugins kotlin jvm version 1 3 31 dependencies implementation gradleApi compile kotlin stdlib jdk8 ```

gildor · Answer

You don t need Kotlin Plugin it already bundled to Gradle but you may use kotlin dsl plugin which configures gradleApi stdlib and uses bundled versions of it ```plugins id org gradle kotlin kotlin dsl version 1 2 10 ```

gildor · Answer

Check that your import is correct maybe you need something like com too FunKt or Companion depends on how your final code looks like check that this file in buildSrc src kotlin not in src groovy

kingsley · Answer

Also might be possible that you re missing ` JvmStatic` on that method so the Groovy buildscript doesn t see it as a static `Fun sayHello ` anymore

gildor · Answer

yes it depends what is final kotlin code

ghedeon · Answer

< gildor> you mean to mirgate buildSrc to kotlin dsl Or just applying the dsl plugin in `build gradle` Because the later gives me `NoClassDefFoundError org gradle kotlin dsl support KotlinDslPluginsKt`

gildor · Answer

Just apply Kotlin DSL plugin to buildSrc project

gildor · Answer

Anyway it s not requirement just simplifies configuration and provide a lot of Kotlin DSL helpers for work with Gradle API from kotlin

gildor · Answer

Looks that this version of Kotlin DSL not compatible with your gardle version unfortunately there is no easy way to consume this plugin to match Gradle you can check requires Kotlin DSL version in your Gradle distribution sources but don t remember how to do that exactly Because if you use kotlin dsl for build gradle you have convinient accessor for this plugin I created an issue about it to simplify usage of kotlin dsl plugin from Groovy code but it s not fixed as I remember

ghedeon · Answer

well didn t work as I mentioned the error Even without going dsl path let s take a simple case buildSrc src main kotlin Dependencies kt ``` object deps val multidex = androidx multidex multidex 2 0 1 ``` I expect this to be visible in any of my `build gradle` files as `implementation deps multidex` But it s not

louiscad · Answer

< ghedeon> Which Android Studio version are you using FYI 3 3 and 3 4 broke buildSrc referencing from groovy based `build gradle` scripts but it is fixed in 3 5 now in RC That bug kicked off my migration to Gradle Kotlin DSL

ghedeon · Answer

AS 3 4 2 grimacing

louiscad · Answer

Then install 3 5 RC3 aside and open the project with it no need to update AGP

ghedeon · Answer

just did it Still doesn t work but at least I ve got imports recognized by IDE So clicking on `deps foo` actually brings you to your kotlin file in buildSrc I m wondering what people that answered YES do

louiscad · Answer

They replied regarding theory but at least two of them are using Gradle Kotlin DSL and dropped dynamic syntax

mbonnin · Answer

< ghedeon> an example of using a kotlin buildSrc with build gradle files

mbonnin · Answer

The buildSrc kotlin plugin is imported from `app build gradle` there <https github com HearthSim Arcane Tracker blob bdf01d728d5eddefba68f76e5da155620f480d00 app build gradle L1>

gildor · Answer

gt I expect this to be visible in any of my `build gradle` files as `implementation deps multidex` But it s not Why do you expect that it will work Groovy is not Kotlin you have to use Java syntax something like `deps INSTANCE getMultidex ` or use JvmStatic instead

mbonnin · Answer

Or make `multidex` const

mbonnin · Answer

I have this ``` object Libs const val supportLibVersion = 28 0 0 ``` Kotlin bytecode shows ``` public final class Libs access flags 0x19 public final static Ljava lang String supportLibVersion = 28 0 0 Lorg jetbrains annotations NotNull invisible ```

gildor · Answer

yeah you right It will work with object

ghedeon · Answer

< gildor> Irrelevant Groovy recognizes that even without const

gildor · Answer

recognize Kotlin Object

ghedeon · Answer

yes

gildor · Answer

what doesn t work than in your case

ghedeon · Answer

well you won t belive me but apparently lower case name of the class

ghedeon · Answer

motherfucking flying bag of dicks 2 days `object deps` gt `object Deps`

gildor · Answer

maybe just some name conflict

gildor · Answer

What kind error did you have

ghedeon · Answer

same for Libs and libs

gildor · Answer

what abou SomethingRandom and somethingrandom

ghedeon · Answer

that `deps` does t exists

gildor · Answer

Groovy man shrugging

ghedeon · Answer

same for somethingrandom They are for real

ghedeon · Answer

if it s not ridiculous enough in my side project with kotlin dsl lower case is not a problem So it s just this weird combination of groovy and kotlin

ghedeon · Answer

was nice knowing you guys for all these years I think I give up on android wave

gildor · Answer

Not really related on Android tho grimacing

ghedeon · Answer

disagree It s an essential part of the android development They brought gradle to android in 2013 2014 5 years later terrible support in IDE constant breaking changes incompatibilities performance issues etc It s an everyday struggle

louiscad · Answer

If you use gradle the default simple way with no third party plugins it just works

louiscad · Answer

You re putting code into the build script itself Understandable Google folks didn t expect this at first Kotlin wasn t still in early early stages mostly unknown

gildor · Answer

gt It s an essential part of the android development Yeah same as huge amount of other technologies and at least Gradle can be avoided if you really know what are you doing