ConnectivityManager getNetworkInfo(int) deprecated

You can use:

getActiveNetworkInfo();

ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
if (activeNetwork != null) { 
    // connected to the internet
    if (activeNetwork.getType() == ConnectivityManager.TYPE_WIFI) {
        // connected to wifi
    } else if (activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE) {
        // connected to mobile data
    }
} else {
    // not connected to the internet
}

Or in a switch case

ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
if (activeNetwork != null) { 
    // connected to the internet
    switch (activeNetwork.getType()) {
        case ConnectivityManager.TYPE_WIFI:
            // connected to wifi
            break;
        case ConnectivityManager.TYPE_MOBILE:
            // connected to mobile data
            break;
        default:
            break;
    }
} else {
    // not connected to the internet
}

February 2020 Update:

The accepted answer is deprecated again in 28 (Android P), but its replacement method only works on 23 (Android M). To support older devices, I wrote a helper function in .

How to use:

int type = getConnectionType(getApplicationContext());

It returns an int, you can change it to enum in your code:

0: No Internet available (maybe on airplane mode, or in the process of joining an wi-fi).

1: Cellular (mobile data, 3G/4G/LTE whatever).

2: Wi-fi.

3: VPN

You can copy either the Kotlin or the Java version of the helper function.

Kotlin:

@IntRange(from = 0, to = 3)
fun getConnectionType(context: Context): Int {
    var result = 0 // Returns connection type. 0: none; 1: mobile data; 2: wifi
    val cm = context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager?
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        cm?.run {
            cm.getNetworkCapabilities(cm.activeNetwork)?.run {
                if (hasTransport(NetworkCapabilities.TRANSPORT_WIFI)) {
                    result = 2
                } else if (hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR)) {
                    result = 1
                } else if (hasTransport(NetworkCapabilities.TRANSPORT_VPN)){
                    result = 3
                }
            }
        }
    } else {
        cm?.run {
            cm.activeNetworkInfo?.run {
                if (type == ConnectivityManager.TYPE_WIFI) {
                    result = 2
                } else if (type == ConnectivityManager.TYPE_MOBILE) {
                    result = 1
                } else if(type == ConnectivityManager.TYPE_VPN) {
                    result = 3
                }
            }
        }
    }
    return result
}

Java:

@IntRange(from = 0, to = 3)
public static int getConnectionType(Context context) {
    int result = 0; // Returns connection type. 0: none; 1: mobile data; 2: wifi
    ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        if (cm != null) {
            NetworkCapabilities capabilities = cm.getNetworkCapabilities(cm.getActiveNetwork());
            if (capabilities != null) {
                if (capabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)) {
                    result = 2;
                } else if (capabilities.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR)) {
                    result = 1;
                } else if (capabilities.hasTransport(NetworkCapabilities.TRANSPORT_VPN)) {
                    result = 3;
                }
            }
        }
    } else {
        if (cm != null) {
            NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
            if (activeNetwork != null) {
                // connected to the internet
                if (activeNetwork.getType() == ConnectivityManager.TYPE_WIFI) {
                    result = 2;
                } else if (activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE) {
                    result = 1;
                } else if (activeNetwork.getType() == ConnectivityManager.TYPE_VPN) {
                    result = 3;
                }
            }
        }
    }
    return result;
}

As for October 2018, accepted answer is deprecated.

getType(), and types themselves, are now deprecated in API Level 28. From Javadoc:

Callers should switch to checking NetworkCapabilities#hasTransport instead with one of the NetworkCapabilities#TRANSPORT* constants

In order to use NetworkCapabilities, you need to pass a Network instance to the getNetworkCapabilities() method. To get that instance you need to call getActiveNetwork() which was added in API Level 23.

So I believe for now the right way to safely check whether you are connected to Wi-Fi or cellular network is:

public static boolean isNetworkConnected() {
    final ConnectivityManager cm = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);

    if (cm != null) {
        if (Build.VERSION.SDK_INT < 23) {
            final NetworkInfo ni = cm.getActiveNetworkInfo();

            if (ni != null) {
                return (ni.isConnected() && (ni.getType() == ConnectivityManager.TYPE_WIFI || ni.getType() == ConnectivityManager.TYPE_MOBILE));
            }
        } else {
            final Network n = cm.getActiveNetwork();

            if (n != null) {
                final NetworkCapabilities nc = cm.getNetworkCapabilities(n);

                return (nc.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR) || nc.hasTransport(NetworkCapabilities.TRANSPORT_WIFI));
            }
        } 
    }

    return false; 
}

You can also check for other types of TRANSPORT, which you can find here.

Important note: if you are connected to Wi-Fi and to a VPN, then your current state could be TRANSPORT_VPN, so you might want to also check for it.

Don't forget to add the following permission to your AndroidManifest file:

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />