initSmartLock.kt

lateinit var googleApiClient: GoogleApiClient
private var googleApiClientSubject = PublishSubject.create<GoogleApiClient>()

fun init() {
    googleApiClient = GoogleApiClient.Builder(context)
        .addConnectionCallbacks(object : GoogleApiClient.ConnectionCallbacks {
            override fun onConnected(connectionHint: Bundle?) {
                googleApiClientSubject.onNext(googleApiClient!!)
            }

            override fun onConnectionSuspended(cause: Int) {
                googleApiClientSubject.onError(Exception("GoogleApiClient connection suspended,: $cause"))
            }
        })
        .addApi(Auth.CREDENTIALS_API)
        .build()
}