ConnectivityManager returns true even if there are no active networks

Question

I am trying to detect if there are any active internet connections (WIFI or MOBILE INTERNET). The code is as follows:

private boolean haveNetwork() {
        ConnectivityManager connMgr =
                (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
        boolean flag=false;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            for (Network network : connMgr.getAllNetworks()) {
                NetworkInfo networkInfo = connMgr.getNetworkInfo(network);
                if (networkInfo.getType() == ConnectivityManager.TYPE_WIFI) {
                    flag=true;
                    break;
                } else if (networkInfo.getType() == ConnectivityManager.TYPE_MOBILE) {
                    flag=true;
                    break;
                }
            }
        }
        Log.d("flag", String.valueOf(flag)); //returns true even if there's no internet connection
        return flag;
    }

As the title says, my connection status always remains to be true, even if there is no internet connection

Is it `internet connections` or `your device connected` ? which one do you want to check? — Md Kawser Habib, Mar 08 '21 at 03:58
I am trying to detect if internet is connected (through WIFI or MOBILE INTERNET). — , Mar 08 '21 at 05:01

score 0 · Answer 1 · answered Mar 10 '21 at 03:51

What you have currently will only tell you if there is either a mobile or Wi-Fi network tracked by ConnectivityManager, not whether you are connected to it or not.

Since you appear to be doing this synchronously, you want to use these two methods:

You can use this if you want to call ConnectivityManager synchronously by replacing your for loop.

Network activeNetwork = connMgr.getActiveNetwork();
if (null == activeNetwork) {
    return false;
}
NetworkCapabilities nc = connMgr.getNetworkCapabilities(activeNetwork);
return nc.hasCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET) 
    && nc.hasCapability(NetworkCapabilities.NET_CAPABILITY_VALIDATED);

score 0 · Answer 2 · edited Jul 25 '22 at 05:50

0

Use NetworkCapabilities as NetworkInfo is deprecated and check the getLinkDownstreamBandwidthKbps() is greater then 1kbps for 1g 32 kbps for at least 2g speed

edited Jul 25 '22 at 05:50

RusJaI

666
1
7
28

answered Jul 21 '22 at 18:40

user19596726

1

ConnectivityManager returns true even if there are no active networks

2 Answers2