Check if a VPN connection is active in Android?

Question

I have a third party VPN app on my non-rooted Android 4.4 device, and want to write a background service to monitor the VPN connection and alert the user if the VPN connection has been broken.

Is there a way to do this? I couldn't find any way using the VPNService API.

Thanks -D

Answer 1

Here is kotlin coroutines flow solution

val isVpnActiveFlow = callbackFlow {
    val connectivityManager =
        context.getSystemService(Context.CONNECTIVITY_SERVICE) as? ConnectivityManager
    if (connectivityManager == null) {
        channel.close(IllegalStateException("connectivity manager is null"))
        return@callbackFlow
    } else {
        val callback = object : ConnectivityManager.NetworkCallback() {
            override fun onAvailable(network: Network) {
                channel.trySend(true)
            }
            override fun onLost(network: Network) {
               channel.trySend(false)
            }
        }
        connectivityManager.registerNetworkCallback(

            //I have to investigate on this builder!
            NetworkRequest.Builder()
                    .addTransportType(NetworkCapabilities.TRANSPORT_VPN)
                    .removeCapability(NetworkCapabilities.NET_CAPABILITY_NOT_VPN)
                    .build(),
            callback
        )
        awaitClose {
            connectivityManager.unregisterNetworkCallback(callback)
        }
    }
}