Android Tutorial => Configuring an existing Gradle project with Kotlin

Example

You can create a New Project in Android Studio and then add Kotlin support to it or modify your existing project. To do it, you have to:

Add dependency to a root gradle file - you have to add the dependency for kotlin-android plugin to a root build.gradle file.

buildscript {

    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.3.1'
        classpath 'org.jetbrains.kotlin:kotlin-gradle-plugin:1.1.2'
    }
}

allprojects {
    repositories {
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

Apply Kotlin Android Plugin - simply add apply plugin: 'kotlin-android' to a module build.gradle file.

Add dependency to Kotlin stdlib - add the dependency to 'org.jetbrains.kotlin:kotlin-stdlib:1.1.2' to the dependency section in a module build.gradle file.

For a new project, build.gradle file could looks like this:

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'

android {
    compileSdkVersion 25
    buildToolsVersion "25.0.2"
    defaultConfig {
        applicationId "org.example.example"
        minSdkVersion 16
        targetSdkVersion 25
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile 'org.jetbrains.kotlin:kotlin-stdlib:1.1.1'
    compile 'com.android.support.constraint:constraint-layout:1.0.2'
    compile 'com.android.support:appcompat-v7:25.3.1'

    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })

    testCompile 'junit:junit:4.12'
}

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Android Android programming with Kotlin Configuring an existing Gradle project with Kotlin

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