Now that the project has been created, it's time to add coroutines support. To do this, open the Project section and double-click in build.gradle for the project. It is located inside the Gradle Scripts section:

Inside this document, you will add a new variable to centralize the coroutines version. In a new line below ext.kotlin.version, add ext.coroutines_version, as shown here, for example:

buildscript {
  ext.kotlin_version = '1.2.50'
  ext.coroutines_version = '0.23.3'
  ...
}

Now you need to add the dependencies for coroutines. Append the dependency configuration in the build.gradle file for the Module:

First, we will add the dependency for coroutines:

dependencies {
  implementation fileTree(dir: 'libs', include: ['*.jar'])
  implementation "org.jetbrains.kotlin:kotlin-stdlib-
  jdk7:$kotlin_version"
  implementation "org.jetbrains.kotlinx:kotlinx-coroutines-
  core:$coroutines_version"
  <...>
}

Currently, coroutines are considered an experimental feature. In order to remove any warning when compiling or running apps using coroutines, it's necessary to also append this to the build.gradle file for the Module:

kotlin {
  experimental {
    coroutines "enable"
  }
}