The Contacts, Reborn library provides Kotlin coroutine extensions for all API functions to handle permissions and executing work in background threads

Contacts-async-permissions-coroutines.kt

launch {
    val contacts = Contacts(context)
        .queryWithPermission()
        ...
        .findWithContext()
        
    val deferredResult = Contacts(context)
        .insertWithPermission()
        ...
        .commitAsync()
    val result = deferredResult.await()
}