Method _getDnsServers

app/src/main/java/eu/faircode/email/DnsHelper.java:444–468

(Context context)

    }

    private static List<String> _getDnsServers(Context context) {
        List<String> result = new ArrayList<>();

        try {
            ConnectivityManager cm = Helper.getSystemService(context, ConnectivityManager.class);
            if (cm == null)
                return result;

            Network active = ConnectionHelper.getActiveNetwork(context);
            if (active == null)
                return result;

            LinkProperties props = cm.getLinkProperties(active);
            if (props == null)
                return result;

            List<InetAddress> dns = props.getDnsServers();
            for (int i = 0; i < dns.size(); i++)
                result.add(dns.get(i).getHostAddress());
        } catch (Throwable ex) {
            Log.e(ex);
        }

        return result;
    }

    static void clear(Context context) {
        try {