Using Context.CONNECTIVITY_SERVICE to check for internet connection

Question

I am using this code to check for the internet connection:

private boolean checkInternetConnection() {
    ConnectivityManager cm = (ConnectivityManager)
                              getSystemService(Context.CONNECTIVITY_SERVICE);
    // test for connection
    if (cm.getActiveNetworkInfo() != null
            && cm.getActiveNetworkInfo().isAvailable()
            && cm.getActiveNetworkInfo().isConnected()) {
        return true;
    } else {
        return false;
    }
}

but even when I turn off the wifi it still returns true.

Tried both on emulator and device with same result?
What is wrong ?

I think its checking your mobile carrier network also. – Padma Kumar Jan 25 '12 at 11:48 — Padma Kumar, Jan 25 '12 at 11:48
So what should i do? Can u help? – Navdroid Jan 25 '12 at 11:51 — Navdroid, Jan 25 '12 at 11:51

score 7 · Accepted Answer · edited Jul 19 '13 at 18:12

7

This simple code works in my case:

public boolean netConnect(Context ctx)
{
    ConnectivityManager cm;
    NetworkInfo info = null;
    try
    {
        cm = (ConnectivityManager) 
              ctx.getSystemService(Context.CONNECTIVITY_SERVICE);
        info = cm.getActiveNetworkInfo();
    }
    catch (Exception e)
    {
        e.printStackTrace();
    }
    if (info != null)
    {
        return true;
    }
    else
    {
        return false;
    }
}

Also this one..

public boolean isOnline() {
    ConnectivityManager cm = (ConnectivityManager)
                              getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo netInfo = cm.getActiveNetworkInfo();
    if (netInfo != null && netInfo.isConnectedOrConnecting()) {
        return true;
    }
    return false;
}

edited Jul 19 '13 at 18:12

Mr_and_Mrs_D

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answered Jan 25 '12 at 11:50

user370305

108,599
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1

The getActiveNetworkInfo() method of ConnectivityManager returns a NetworkInfo instance representing the first connected network interface it can find or null if none if the interfaces are connected. Checking if this method returns null should be enough to tell if an internet connection is available. – user370305 Jan 25 '12 at 11:56
Does this require any special permissions like ACCESS_WIFI_STATE? – Bill Mote Feb 05 '16 at 16:23
1

getActiveNetworkInfo: "This method was deprecated in API level 29." NetworkInfo: "This class was deprecated in API level 29. Callers should instead use the ConnectivityManager.NetworkCallback API to learn about connectivity changes...". Try my answer on: https://stackoverflow.com/a/64977886/1741997 – cesargastonec Nov 24 '20 at 15:15

Vicky Kapadia · Answer 2 · 2019-06-15T05:25:27.783

You can use following:

    public boolean isNetworkAvailable(Context contextValue) {
    Context context = contextValue;
    ConnectivityManager connectivity = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

    if (connectivity != null) {
        NetworkInfo[] info = connectivity.getAllNetworkInfo();
        if (info != null) {
            for (int i = 0; i < info.length; i++) {
                if (info[i].getState() == NetworkInfo.State.CONNECTED) {
                    return true;
                }
            }
        }
    }

    return false;

}

score 1 · Answer 3 · answered Jan 25 '12 at 11:56

1

Try this....

if((connMgr.getNetworkInfo(0).getState() == NetworkInfo.State.CONNECTED) ||  (connMgr.getNetworkInfo(1).getState() == NetworkInfo.State.CONNECTED))                   
{
   return true;
}else
{
   return false;
}

answered Jan 25 '12 at 11:56

android developer

1,253
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score 1 · Answer 4 · answered Jan 25 '12 at 11:57

You can check for both WIFI and internet as follows:

private boolean haveNetworkConnection() {
boolean haveConnectedWifi = false;
boolean haveConnectedMobile = false;

ConnectivityManager cm = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);

NetworkInfo[] netInfo = cm.getAllNetworkInfo();
for (NetworkInfo ni : netInfo) {
    if (ni.getTypeName().equalsIgnoreCase("WIFI"))
        if (ni.isConnected())
            haveConnectedWifi = true;
    if (ni.getTypeName().equalsIgnoreCase("MOBILE"))
        if (ni.isConnected())
            haveConnectedMobile = true;
}
return haveConnectedWifi || haveConnectedMobile;
}

Obviously, It could easily be modified to check for individual specific connection types, e.g., if your app needs the potentially higher speeds of Wi-fi to work correctly etc.

Use networkInfo.getType() == ConnectivityManager.TYPE_WIFI instead. — Vicky Kapadia, Aug 23 '13 at 06:40
Its better to use android constants than assuming them neglecting the OS/Manufacturer — Vicky Kapadia, Aug 23 '13 at 06:41

score 0 · Answer 5 · answered Mar 21 '22 at 09:03

Here's a Kotlin implementation where you get to breakdown which transport your device is connect to the network.

Interesting part would be that you can use <ConnectivityManager> to get from system service without casting it, makes things cleaner.

And, one thing people failed to mention is that connectivityManager?.activeNetwork is only available for Android Marshmallow and above.

For device lower than that, we can resort to connectivityManager?.activeNetworkInfo and activeNetworkInfo.isConnected, even though they are deprecated.

val connectivityManager = context.getSystemService<ConnectivityManager>()
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
    val activeNetwork = connectivityManager?.activeNetwork ?: return false
    val networkCapabilities = connectivityManager.getNetworkCapabilities(activeNetwork) ?: return false

    return when {
        networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI) -> true
        networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR) -> true
        networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_VPN) -> true
        networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_ETHERNET) -> true
        networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_BLUETOOTH) -> true
        else -> false
    }
} else {
    val activeNetworkInfo = connectivityManager?.activeNetworkInfo ?: return false
    return activeNetworkInfo.isConnected
}

Using Context.CONNECTIVITY_SERVICE to check for internet connection

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