Here is a summary of the initial setup steps for adding Kotlin files to an Android project written entirely in Java.
+ apply plugin: 'kotlin-android'
+ apply plugin: 'kotlin-android-extensions'
buildscript {
}
repositories {
    + mavenCentral()
}
dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
}
android {
}
Apply the plugin.
apply plugin: 'kotlin-android-extensions'
apply plugin: 'kotlin-android'
Added maven Central to repositories
mavenCentral()
Added Kotlin jdk to the library set.
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
buildscript {
    + ext.kotlin_version = '1.3.71'
    repositories {
    }
    dependencies {
        + classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}
Add the version of Kotlin.
 ext.kotlin_version = '1.3.71'
Add the classpath to dependencies.
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
You can now build Kotlin within your Java project.
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