Issue with databinding using Kotlin for Android

Question

I am trying to enable data binding for my Android project using Kotlin. I have Kotlin plugin enabled, but I am not able to enable data binding I keep getting the following error

Error:(66, 0) Could not find method kapt() for arguments [com.android.databinding:compiler:2.0.0-beta6] on object of type org.gradle.api.internal.artifacts.dsl.dependencies.DefaultDependencyHandler 

I have the following dependencies for data binding in my gradle file

dependencies {  ...  kapt 'com.android.databinding:compiler:2.0.0-beta6' }   kapt {     generateStubs = true } 

Answer 1

Edit: With Kotlin 1.1 and Kapt3 it works slightly different:

in your project build.gradle:

buildscript {     ext {        ...        plugin_version = "2.3.1"        kotlin_version = "1.1.2-3"        ...    }     ...     dependencies {        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"        classpath "com.android.tools.build:gradle:$plugin_version"        ...    } } 

and in your app build.gradle:

    apply plugin: "kotlin-android"     apply plugin: "kotlin-kapt"     ...     android {       ...       dataBinding {             enabled = true         }       ...     }      dependencies {        ...        kapt "com.android.databinding:compiler:$plugin_version"        ...     } 

It's really important that the databinding compiler version and the plugin version are identical.
Also note that with kapt3, you shouldn't use the generateStubs flag anymore.

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Old Answer

Having the Android Studio plugin enabled isn't enough, you also need to adjust your gradle files a little bit (add and apply the kotlin-gradle-plugin) Here are excerpts of my gradle files with working Java and Kotlin Databinding

In your project build.gradle:

buildscript { ...  dependencies {    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.0.5"    classpath 'com.android.tools.build:gradle:2.2.3'    ...  } } 

and in your app build.gradle:

apply plugin: "kotlin-android" ... android {   ...   dataBinding {         enabled = true     }   ... } kapt {     generateStubs = true } dependencies {    ...    kapt "com.android.databinding:compiler:2.2.0"    ... } 

(I'm using a newer version of the databinding compiler here, you probably should do this as well)

Answer 2

Try to include the missing blocks in your gradle files with the help of the following reference gradle file source.

App level Build.Gradle

apply plugin: 'com.android.application' apply plugin: 'kotlin-android' apply plugin: 'kotlin-android-extensions' apply plugin: 'kotlin-kapt'  android {     compileSdkVersion 25     buildToolsVersion "25.0.3"     defaultConfig {         applicationId "com.example.adventure.abc"         minSdkVersion 16         targetSdkVersion 25         versionCode 1         versionName "1.0"         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"          vectorDrawables.useSupportLibrary = true     }     buildTypes {         release {             minifyEnabled false             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'         }     }     sourceSets {         main.java.srcDirs += 'src/main/kotlin/com/dougritter/marvelmovies'     }     dataBinding {         enabled = true     } }     kapt {     generateStubs = true }  dependencies {     //Compatibility     compile fileTree(dir: 'libs', include: ['*.jar'])     compile "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"     androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {         exclude group: 'com.android.support', module: 'support-annotations'     })     kapt 'com.android.databinding:compiler:2.3.0'      //Libraries     testCompile 'junit:junit:4.12'     compile 'com.android.support:appcompat-v7:25.3.1'     compile 'com.android.support:design:25.3.1'     compile 'com.android.support:support-vector-drawable:25.3.1'     compile 'com.android.support:support-v4:25.3.1'     compile project(':domain')     compile project(':androidutils')     compile 'com.android.support.constraint:constraint-layout:1.0.2'     compile 'com.jakewharton.timber:timber:4.5.1'   } 

Project level Build.Gradle

    // Top-level build file where you can add configuration options common to all sub-projects/modules.   buildscript {     ext.kotlin_version = '1.1.2-2'     repositories {         maven { url 'https://maven.google.com' }         jcenter()     }     dependencies {         classpath 'com.android.tools.build:gradle:3.0.0-alpha1'         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()         maven { url 'https://maven.google.com' }         mavenCentral()     } }   task clean(type: Delete) {     delete rootProject.buildDir }