Android - Detect if Wifi Requires Browser Login

Question

My university has an open wifi access point, however it requires you to enter your e-mail before it allows you to use the web. My problem is that the Wifi is stupid in that

Answer 1

Ping an external IP address (like google.com) to see if it responds.

    try {
        Runtime runtime = Runtime.getRuntime();
        Process proc = runtime.exec("ping -c 1 " + "google.com");
        proc.waitFor();     
        int exitCode = proc.exitValue();
        if(exitCode == 0) {
            Log.d("Ping", "Ping successful!";
        } else {
            Log.d("Ping", "Ping unsuccessful.");
        }
    } 
    catch (IOException e) {}
    catch (InterruptedException e) {}

The only downside is this would also indicate that a web login is required when there is simply no internet connectivity on the WiFi access point.

@CommonsWare I believe this is a better answer than opening a UrlConnection and checking the host, since the host doesn't always change even when displaying the redirect page. For example, I tested on a Belkin router and it leaves whatever you typed in the browser as is, but still displays its own page. urlConnection.getUrl().getHost() returns what it should because of this.