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Android Studio does not recognize Java and Kotlin classes in the same project

I made a Java project in Android Studio, and tried to put a file in Kotlin. But you can see that Android Studio doesn’t recognize Kotlin files in the same project that contains Java files. Can anyone help please?

Attached photos explaining better:

https://i.stack.imgur.com/sDNoV.png

https://i.stack.imgur.com/MwWbA.png

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2

Answers


  1. Chosen as BEST ANSWER
    0

    I discovered to fix this error. It has to put the following code in root build.gradle file:

    buildscript {
ext.kotlin_version = '1.1.60'
    repositories {
        jcenter()
        maven {
            url 'https://maven.google.com'
        }
    }

    dependencies {
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}

    Thank you very to all that tried to help.


  2. 0

    Maybe you used Annotation in that class. Add kotlin-kapt plugin in build.gradle/module ,this may fix your problem. You can read this document for more guidence.

    plugins {
    id 'com.android.application'
    id 'kotlin-android'
    id 'kotlin-kapt' 
//    id 'kotlin-android-extensions'
    id 'kotlin-parcelize' // this instead of kotlin-android-extensions
}

    Then sync your project.

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