Gradle Kotlin DSL support.

How should Flutter use Gradle Kotlin DSL?
I got many errors while trying to suggest Groovy to Kotlin.
I saw 33726 but didn't find a solution.

@xiao-cao-x
I am not sure, but the tool may not be supporting the Kotlin DSL yet. Can you provide flutter doctor -v, all related build.gradle files along with error log you get ?

all related build.gradle files along with error log you get ?

@xiao-cao-x Can you provide above ?

I tried to find similar / duplicate for this request, but couldn't find any, so keeping it open for further insights on this.

The Kotlin DSL is no the default, so this should receive more attention

References:

Any updates? From this issue it seems like some things are happening: #121541. But I still have issues and can't use KSP

@Daphne-CoffeeIT

@Daphne-CoffeeIT Issue #121541 is unrelated to this one.

@bartekpacia

@bartekpacia Alright. This issue was most recently mentioned there, so that's why looked for answers there as well. For my case they are related, since I want to migrate from Groovy to Kotlin.

@Daphne-CoffeeIT

@Daphne-CoffeeIT Sure! For a very simple example app that is migrated from Gradle Groovy DSL to Gradle Kotlin DSL, check out this one in Flutter repo (link). There are some redundant stuff.

I can also share buildfiles of my private app that is migrated from Groovy to Kotlin:

settings.gradle.kts

pluginManagement {
    val flutterSdkPath = run {
        val properties = java.util.Properties()
        file("local.properties").inputStream().use { properties.load(it) }
        val flutterSdkPath = properties.getProperty("flutter.sdk")
        require(flutterSdkPath != null) { "flutter.sdk not set in local.properties" }
        flutterSdkPath
    }

    includeBuild("$flutterSdkPath/packages/flutter_tools/gradle")

    repositories {
        google()
        mavenCentral()
        gradlePluginPortal()
    }
}

plugins {
    id("dev.flutter.flutter-plugin-loader")

    // Consult before bumping:
    // https://developer.android.com/studio/releases#android_gradle_plugin_and_android_studio_compatibility
    id("com.android.application") version "8.2.2" apply false

    id("org.jetbrains.kotlin.android") version "2.0.0" apply false
    id("com.google.gms.google-services") version "4.4.1" apply false
    id("com.google.firebase.crashlytics") version "2.9.9" apply false
}

include(":app")

build.gradle.kts

rootProject.layout.buildDirectory = file("../build")
subprojects {
    project.layout.buildDirectory = file(rootProject.layout.buildDirectory.map { "$it/${project.name}" })
}
subprojects {
    project.evaluationDependsOn(":app")
}

tasks.register<Delete>("clean") {
    delete(rootProject.layout.buildDirectory)
}

app/build.gradle.kts

import java.io.FileInputStream
import java.util.Properties

plugins {
    id("com.android.application")
    id("org.jetbrains.kotlin.android")
    id("dev.flutter.flutter-gradle-plugin")
    id("com.google.gms.google-services")
    id("com.google.firebase.crashlytics")
}

val keystoreProperties = Properties()
val keystorePropertiesFile = rootProject.file("keystore.properties")
if (keystorePropertiesFile.exists()) {
    keystoreProperties.load(FileInputStream(keystorePropertiesFile))
}

android {
    namespace = "pl.baftek.discoverrudy"
    compileSdk = 34

    compileOptions {
        sourceCompatibility = JavaVersion.VERSION_11
        targetCompatibility = JavaVersion.VERSION_11
    }

    kotlinOptions {
        jvmTarget = "11"
    }

    defaultConfig {
        applicationId = "pl.baftek.discoverrudy"
        minSdk = 21
        targetSdk = 34
        versionCode = flutter.versionCode()
        versionName = flutter.versionName()
    }

    signingConfigs {
        create("release") {
            storeFile = if (keystorePropertiesFile.exists()) file(keystoreProperties["storeFile"] as String) else null
            storePassword = if (keystorePropertiesFile.exists()) keystoreProperties["storePassword"] as String else null
            keyAlias = if (keystorePropertiesFile.exists()) keystoreProperties["keyAlias"] as String else null
            keyPassword = if (keystorePropertiesFile.exists()) keystoreProperties["keyPassword"] as String else null
        }
    }

    buildTypes {
        named("debug") {
            signingConfig = signingConfigs.getByName("debug")
            isShrinkResources = false
            isMinifyEnabled = false
        }

        named("release") {
            signingConfig = signingConfigs.getByName("release")
            isShrinkResources = true
            isMinifyEnabled = true

            proguardFiles(
                getDefaultProguardFile("proguard-android-optimize.txt"),
                "proguard-rules.pro"
            )

            // Add ProGuard ? and Dart mapping files
        }
    }
}

flutter {
    source = "../.."
}

Hope it helps!

@bartekpacia

@bartekpacia Thanks, but I do have the Kotlin code, that's not the issue. It's just that Flutter and most Flutter tools, for example when running flutterfire configure, don't support it yet. They look for gradle files instead of gradle.kts files. That and millions of other issues show that Flutter currently doesn't (fully) support it yet. And then I read all over the internet that it indeed doesn't, so I migrated back. If you have different information I'd love to see the source!

Ah, sorry to hear that. At this point it's up to the ecosystem to adapt to Gradle Kotlin DSL.
I don't see what else Flutter could do here (in addition to providing some guidance for plugin/package authors)

@bartekpacia

I think our tooling now checks for build.gradle.kts in addition to build.gradle.

flutterfire issues cant be resolved in this repository. If there is a more specific issue please file it but in general I think the work @bartekpacia did to support kotlin dsl solves this issue.

Will leave this comment for a bit to see if others disagree then will close this issue.

Without additional information, we are unfortunately not sure how to resolve this issue. We are therefore reluctantly going to close this bug for now.
If you find this problem please file a new issue with the same description, what happens, logs and the output of 'flutter doctor -v'. All system setups can be slightly different so it's always better to open new issues and reference the related ones.
Thanks for your contribution.

This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.

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Gradle Kotlin DSL support. #93238

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Gradle Kotlin DSL support. #93238

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darshankawar commented on Nov 9, 2021

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