The perfect function to check Android internet connectivity including bluetooth pan

Question

My application is working perfect in wifi and mobile networks, but fails to detect when connected through bluetooth tethering.

public boolean isNetworkAvailable() {
    ConnectivityManager cm = (ConnectivityManager) 
      getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo networkInfo = cm.getActiveNetworkInfo();

    if (networkInfo != null && networkInfo.isConnected()) {
        return true;
    }
    return false;
}

I tried running a few other applications . they also shows no network connectivity, But google applications works perfect and so as some other apps like whatsap. Wondering how they are doing it, and why most of the applications missing this point..

Can anyone tell me a way to check the internet connectivity in android, through all means available,including bluetooth pan and proxy,etc.

Any help will be appreciated. Thanks in advance..

Answer 1

Try connecting to an "always available" website. if any connection exist, this should return true:

protected static boolean hasInternetAccess()
{
    try
    {
        URL url = new URL("http://www.google.com");

        HttpURLConnection urlc = (HttpURLConnection) url.openConnection();
        urlc.setRequestProperty("User-Agent", "Android Application:1");
        urlc.setRequestProperty("Connection", "close");
        urlc.setConnectTimeout(1000 * 30);
        urlc.connect();

        // http://www.w3.org/Protocols/HTTP/HTRESP.html
        if (urlc.getResponseCode() == 200 || urlc.getResponseCode() > 400)
        {
            // Requested site is available
            return true;
        }
    }
    catch (Exception ex)
    {
        // Error while trying to connect
        return false;
    }
    return false;
}