Check If a Vpn Connection Is Active in Android

Check if a VPN connection is active in Android?

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)
            }
        }
    }

Detect if an always-on VPN is configured on Android

In the end, it seems this isn't possible on a normal device any way that I can find. I think is possible if you're a device admin, but that requires managed enterprise devices etc.

For now, I've handled this by watching for near-instant (less than 200ms) VPN setup failures (between running startActivityForResult(vpnIntent) and receiving onActivityResult with RESULT_CANCELED) and then showing a helpful message in that case.

Full implementation is in https://github.com/httptoolkit/httptoolkit-android/commit/928fbf92a4f868042789471be0d42800a226194b in case you're trying to do the same.

Check VPN Status Connected or Not Connected

This is works for me: Tested from API 16 to 23:

 List<String> networkList = new ArrayList<>();
try {
    for (NetworkInterface networkInterface : Collections.list(NetworkInterface.getNetworkInterfaces())) {
        if (networkInterface.isUp())
            networkList.add(networkInterface.getName());
    }
} catch (Exception ex) {
    Timber.d("isVpnUsing Network List didn't received");
}

return networkList.contains("tun0");

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