Проверка интернет соединения

class ConnectionLiveData(context: Context) :
        MutableLiveData<ConnectionLiveData.ServerConnectionType>() {

    enum class ServerConnectionType { ONLINE, OFFLINE }

    private var connectivityManager: ConnectivityManager =
            context.getSystemService(CONNECTIVITY_SERVICE) as ConnectivityManager

    private val connectivityManagerCallback: ConnectivityManager.NetworkCallback =
            object : ConnectivityManager.NetworkCallback() {
                override fun onAvailable(network: Network?) {
                    postValue(ServerConnectionType.ONLINE)
                }

                override fun onLost(network: Network?) {
                    postValue(ServerConnectionType.OFFLINE)
                }
            }

    override fun onActive() {
        super.onActive()

        updateConnection()
        val networkRequest = NetworkRequest.Builder()
                .addTransportType(TRANSPORT_CELLULAR)
                .addTransportType(TRANSPORT_WIFI)
                .build()
        connectivityManager.registerNetworkCallback(networkRequest, connectivityManagerCallback)
    }

    override fun onInactive() {
        super.onInactive()
        connectivityManager.unregisterNetworkCallback(connectivityManagerCallback)
    }

    private fun updateConnection() {
        val activeNetwork: NetworkInfo? = connectivityManager.activeNetworkInfo
        if (activeNetwork?.isConnected == true) {
            postValue(ServerConnectionType.ONLINE)
        }
    }
}