“Extension with name 'android' does not ex

问题:

When I try to add Kotlin to our Android project using the official Kotlin tutorial (https://kotlinlang.org/docs/tutorials/kotlin-android.html), Gradle fails launching the error Extension with name 'android' does not exist.

回答1:

Android Studio modifies your build.gradle adding apply plugin: 'kotlin-android' above apply plugin: 'com.android.application'. Just move the Kotlin line below the Android one and Gradle will run smoothly. It should look like this example:

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

回答2:

This is the correct order for above extension issue.

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