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Kotlin + Binding library setup in Android Studio

Envrionment
Java 8
Android Studio 2.3.1
gradle 2.3.1
kotlin 1.1.1
DataBinding 2.0

Installing the Kotlin plugin

https://blog.jetbrains.com/kotlin/2013/08/working-with-kotlin-in-android-studio/ After installation, restart Android Studio.

Setting your project

Create src/main/kotlin folder for kotlin source code. Setup project/build.gradle, project/app/build.gradle project/build.gradle 
 
buildscript {
    ext.kotlin_version = '1.1.1'
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.3.1'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath "org.jetbrains.kotlin:kotlin-android-extensions:$kotlin_version"

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}
And you need some configurations in /app/build.gradle as well. project/app/build.gradle 
 
apply plugin: 'com.android.application'
apply plugin: 'kotlin-kapt'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'

android {
    compileSdkVersion 25
    buildToolsVersion "25.0.1"
    defaultConfig {
        applicationId "com.example.kotlin"
        minSdkVersion 15
        targetSdkVersion 25
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    dataBinding {
        enabled = true
        version = "2.0.0"
    }
    kapt {
        generateStubs = true
    }
}

dependencies {
    kapt 'com.android.databinding:compiler:2.3.0'
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:25.3.1'
    compile 'com.android.support:design:25.3.1'
    testCompile 'junit:junit:4.12'
    compile "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"

}
repositories {
    mavenCentral()
}

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