如何检查android中连接的真实互联网？

附：这就是我们在应用程序中所做的事情..

public static Boolean isReachable(Context context) {
    //  First,check we have connectivity
    final Connectivitymanager connMgr = (Connectivitymanager) context.getSystemservice(Context.CONNECTIVITY_serviCE);
    final NetworkInfo neTinfo = connMgr.getActiveNetworkInfo();

    if (neTinfo != null && neTinfo.isConnected()) {
        //  check if google is reachable
        try {
            URL url = new URL("http://www.google.com");
            httpURLConnection urlc = (httpURLConnection) url.openConnection();
            urlc.setrequestProperty("Connection","close");
            urlc.setConnectTimeout(10 * 1000); // Ten seconds timeout in milliseconds
            urlc.connect();
            if (urlc.getResponseCode() == 200) { // success
                return true;
            } else { // Fail
                return false;
            }
        } catch (IOException E) {
            Log.e(tag,e.getmessage());
            return false;
        }
    } else {
        return false;
    }
}