Detect Internet Connection in Android Application?

Question

I have following method, which will check for the Internet connection in the device :

public static boolean checkInternetConnection(Context context) {
    ConnectivityManager connectivityManager = 
            (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

    if (connectivityManager.getActiveNetworkInfo() != null
            && connectivityManager.getActiveNetworkInfo().isAvailable()
            && connectivityManager.getActiveNetworkInfo().isConnected()) {
        return true;
    } else {
        return false;
    }

}

But after a while I found out that this method only checks for the Network Connectivity; like the device is connected to a router and the router is ON but no internet is available, this method returns true.

So How to know that there is actual internet or not ?

Nikolay Elenkov · Answer 1 · 2012-12-17T05:48:41.797

4

So what is 'actual internet'? The ability to connect to any possible host on the Internet at any given time? A bit hard to test, no? Try connecting to a well-known server (Google, NASA, your country's top provider home page), and if it works, you probably have 'actual Internet'.

edited Dec 17 '12 at 05:48

answered Dec 17 '12 at 05:39

Nikolay Elenkov

52,576
10
84
84

I would go a bit farther and say its best to check if you can connect to a dedicated IP address, such as google's static, and not rely on DNS to do the lookups. – Richard J. Ross III Dec 17 '12 at 05:41
Yes, but if DNS is broken, the whole thing is not of much use, right? – Nikolay Elenkov Dec 17 '12 at 05:43

score 1 · Answer 2 · answered Dec 17 '12 at 05:43

1

The only way I see for you is trying to connect to a website like google and if you get result then you can be sure of it, else no internet activity.

answered Dec 17 '12 at 05:43

Nima Sa

89
6

score 0 · Answer 3 · answered Dec 17 '12 at 05:39

try this function...

public static Boolean checknetwork(Context mContext) 
    {

        NetworkInfo info = ((ConnectivityManager) mContext
                .getSystemService(Context.CONNECTIVITY_SERVICE))
                .getActiveNetworkInfo();
        if (info == null || !info.isConnected()) 
        {

            return false;
        }
        if (info.isRoaming()) 
        {
            // here is the roaming option you can change it if you want to
            // disable internet while roaming, just return false
            return true;
        }

        return true;

    }

score 0 · Answer 4 · edited May 23 '17 at 11:43

0

There are lots of questions already on this topic with answers with suggested solution. Try taking a look at some of these.

Check Network Coverage in Android before trying to send SMS

How to check internet access (INCLUDING tethering!) on Android?

How to determine the network unavailability in android

edited May 23 '17 at 11:43

Community

1
1

answered Dec 19 '12 at 10:23

Rod Burns

2,104
13
24

Detect Internet Connection in Android Application?

4 Answers4