Android - Experimental Gradle Plugin 0.2.0

1

Currently, the kotlin-android Gradle plugin does not work with the next-generation Android gradle plugin, which supports native code and better script execution times. To verify this, clone the git repository at:

git@github.com:googlesamples/android-ndk.git

Then use Android Studio to open one of the projects contained in that repository (I chose hello-jni). Compiling the project should work, but it will not after adding the following to app/build.gradle:

apply plugin: 'kotlin-android'


``
Error:(2, 0) Extension with name ‘android’ does not exist. Currently registered extension names: [ext, sources, binaries, defaultArtifacts, reporting, buildTypes, flavors, toolChains]


Where (2,0) is the location of the “apply kotlin-android” line in build.gradle. My guess is that this is because the redesigned DSL they’re moving to for the Android plugin contains several changes - the most relevant of which is that “android” has been renamed to “model.android”.


I understand that it’s very fast-moving, prerelease software, so I don’t want to make a feature request to add support for this. I am wondering, however, if any Gradle experts might be able to chime in with a workaround that can perhaps point the Kotlin plugin to the information it’s looking for from the original Android plugin.
2

If I'm not mistaken, I think that "kotlin-android-extensions" had already been deprecated in favor of anko.

And also make sure that in the Android Studio you’ve already installed the Kotlin and Kotlin Android plugin.

A typical gradle file would be like this:

buildscript {
  ext.kotlin_version = '0.13.1513'
  ext.anko_version = '0.7'
  ext.android_support_version = '23.0.1'



  repositories {

  jcenter()

  mavenCentral()

  }


  dependencies {

  classpath “org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version”

  }

}


apply plugin: ‘com.android.application’

apply plugin: ‘kotlin-android’


android {

  compileSdkVersion 23

  buildToolsVersion “23.0.1”


  defaultConfig {

  applicationId “com.example.demo”

  minSdkVersion 9

  targetSdkVersion 23

  versionCode 1

  versionName “1.0”

  }


  compileOptions {

  sourceCompatibility JavaVersion.VERSION_1_7

  targetCompatibility JavaVersion.VERSION_1_7

  }


  buildTypes {

  release {

  minifyEnabled false

  proguardFiles getDefaultProguardFile(‘proguard-android.txt’), ‘proguard-rules.pro’

  }

  }


  sourceSets {

  main.java.srcDirs += ‘src/main/kotlin’

  androidTest.java.srcDirs += ‘src/androidTest/kotlin’

  }


  packagingOptions {

  exclude ‘META-INF/LICENSE’

  exclude ‘META-INF/NOTICE’

  exclude ‘META-INF/LICENSE.txt’

  exclude ‘META-INF/NOTICE.txt’

  }

}


repositories {

  jcenter()

  mavenCentral()

}


dependencies {

  compile fileTree(include: [‘*.jar’], dir: ‘libs’)


  compile ‘com.android.support:multidex:1.0.1’


  compile “com.android.support:design:$android_support_version”

  compile “com.android.support:recyclerview-v7:$android_support_version”

  compile “com.android.support:cardview-v7:$android_support_version”

  compile “com.android.support:gridlayout-v7:$android_support_version”


  compile “org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version”


  // anko

  compile “org.jetbrains.anko:anko-sdk23:$anko_version”

  compile “org.jetbrains.anko:anko-support-v4:$anko_version”

  compile “org.jetbrains.anko:anko-appcompat-v7:$anko_version”

  compile “org.jetbrains.anko:anko-common:$anko_version”

  compile “org.jetbrains.anko:anko-design:$anko_version”

  compile “org.jetbrains.anko:anko-recyclerview-v7:$anko_version”

  compile “org.jetbrains.anko:anko-gridlayout-v7:$anko_version”

  compile “org.jetbrains.anko:anko-cardview-v7:$anko_version”

  compile “org.jetbrains.anko:anko-percent:$anko_version”


}

3

Android Extensions and Anko are two complimentary projects, none is a successor of the other.

4

My Kotlin environment works correctly, and I'm not having any trouble writing traditional Android apps using Kotlin.

The topic of my post exclusively pertains to Android Studio’s upcoming support for native C development, which depends on a newer version of the Android Gradle plugin, which as outlined in OP appears to be incompatible with the current version of Kotlin’s Gradle plugin.