Kotlin unresolved reference in IntelliJ

Question

I started off with the tutorial for learning Kotlin in IntelliJ.When I tried running the example i.e

fun main(args: Array) {
 prin         


        

Answer 1

My problem was solved by adding kotlin as follow

presentation.gradle (app.gradle)

apply plugin: 'com.android.application'

apply plugin: 'kotlin-android' // here

apply plugin: 'kotlin-android-extensions' // and here

android {
    ...
}

dependencies {
    ...
}

domain.gradle (pure kotlin)

My error was throw here, because Android Studio create my domain module as pure Java Module and applied plugin as java, and I used it in the my presentation module that is a Android/Kotlin Module

The Android Studio finds and import the path of package but the incompatibillity don't allow the build.

Just remove apply plugin: 'java' and swith to kotlin as follow

apply plugin: 'kotlin' // here is

dependencies {
    ...
}

...

data.gradle

apply plugin: 'com.android.library'

apply plugin: 'kotlin-android' // here

apply plugin: 'kotlin-android-extensions' // and here 

android {
    ...
}

dependencies {
    ..
}

I think that it will be helpfull

Answer 2

I tried everything: clean build folders, run gradle clean build, execute AS invalidate cache(x2), reinstall Kotlin plugin, restarting pc.

But in the end after doing all this it still didn't work, but doing also removal from project build.gradle of this line: apply plugin: 'kotlin-android-extensions', gradle sync and then re-adding worked

Answer 3

Invalidating caches and updating the Kotlin plugin in Android Studio did the trick for me.

Answer 4

Another thing I would like to add is that you need to select View -> Tool Windows -> Gradle before you can run the project using the Gradle.

If using the Gradle the project builds and runs normally but using the IntelliJ it doesn't, then this can solve the matter.

Answer 5

Check and install Android Studio Updates. This fix the problem.

Answer 6

For me, it was due to the project missing Gradle Libraries in its project structure.

Just add in build.gradle: apply plugin: 'idea'

And then run: $ gradle idea

After that gradle rebuilds dependencies libraries and the references are recognized!