MainActivity.kt

val request: Task<Review Info?> = reviewManager.requestReviewFlow()
request.addOnCompleteListener { task ->
    if (task.isSuccessful) {
        // We got the ReviewInfo object
        val reviewInfo = task.result
    } else {
        // There was some problem, log or handle the error code.
        @ReviewErrorCode val reviewErrorCode = (task.getException() as TaskException).errorCode
    }
}