[android] ConnectivityManager getNetworkInfo(int) deprecated

Using compileSdkVersion 23, however trying to support as far back as 9.

getNetworkInfo(int) was deprecated in 23. The suggestion was to use getAllNetworks() and getNetworkInfo(Network) instead. However both of these require minimum of API 21.

Is there a class that we can use in the support package that can assist with this?

I know that a solution was proposed before, however the challenge of my minimum API requirements of 9 poses a problem.

https://www.agnosticdev.com/content/how-detect-network-connectivity-android

please follow this tutorial it should help anyone looking for answers.

note networkInfo has been deprecated hence replace it is isNetworkReacheable() with @vidha answer below passing getApplicationContext() as parameter

  public static boolean isNetworkReacheable(Context context) {
    boolean result = false;
    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 = true;
                } else if (capabilities.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR)) {
                    result = true;
                }
            }
        }
    } else {
        if (cm != null) {
            NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
            if (activeNetwork != null) {
                // connected to the internet
                if (activeNetwork.getType() == ConnectivityManager.TYPE_WIFI) {
                    result = true;
                } else if (activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE) {
                    result = true;
                }
            }
        }
    }
    return result;
}

checking network status with target sdk 29 :

 @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) {

        val capabilities =
            cm.getNetworkCapabilities(cm.activeNetwork)
        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 {

        val activeNetwork = cm.activeNetworkInfo
        if (activeNetwork != null) {
            // connected to the internet
            if (activeNetwork.type === ConnectivityManager.TYPE_WIFI) {
                result = 2
            } else if (activeNetwork.type === ConnectivityManager.TYPE_MOBILE) {
                result = 1
            } else if (activeNetwork.type === ConnectivityManager.TYPE_VPN) {
                result = 3
            }
        }
    }
    return result
}

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;
}

Many answers still use getNetworkType below 23 which is deprecated; use below code to check if the device has an internet connection.

public static boolean isNetworkConnected(Context context) {

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

    if (cm != null) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            NetworkCapabilities capabilities = cm.getNetworkCapabilities(cm.getActiveNetwork());
            return capabilities != null && (capabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI) || capabilities.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR));
        } else {
            NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
            return activeNetwork != null && activeNetwork.isConnected();
        }
    }

    return false;
}

..

And, do not forget to add this line in Manifest

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

The below code works on all APIs.(Kotlin)

However, getActiveNetworkInfo() is deprecated only in API 29 and works on all APIs , so we can use it in all Api's below 29

fun isInternetAvailable(context: Context): Boolean {
            var result = false
            val connectivityManager =
                context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                val networkCapabilities = connectivityManager.activeNetwork ?: return false
                val actNw =
                    connectivityManager.getNetworkCapabilities(networkCapabilities) ?: return false
                result = when {
                    actNw.hasTransport(NetworkCapabilities.TRANSPORT_WIFI) -> true
                    actNw.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR) -> true
                    actNw.hasTransport(NetworkCapabilities.TRANSPORT_ETHERNET) -> true
                    else -> false
                }
            } else {
                connectivityManager.run {
                    connectivityManager.activeNetworkInfo?.run {
                        result = when (type) {
                            ConnectivityManager.TYPE_WIFI -> true
                            ConnectivityManager.TYPE_MOBILE -> true
                            ConnectivityManager.TYPE_ETHERNET -> true
                            else -> false
                        }

                    }
                }
            }

            return result
        }

Since answers posted only allow you to query the active network, here's how to get NetworkInfo for any network, not only the active one (for example Wifi network) (sorry, Kotlin code ahead)

(getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager).run {
    allNetworks.find { getNetworkInfo(it).type == ConnectivityManager.TYPE_WIFI }?.let { network -> getNetworkInfo(network) }
//    getNetworkInfo(ConnectivityManager.TYPE_WIFI).isAvailable // This is the deprecated API pre-21
}

This requires API 21 or higher and the permission android.permission.ACCESS_NETWORK_STATE

NetManager that you can use to check internet connection on Android with Kotlin

If you use minSdkVersion >= 23

class NetManager @Inject constructor(var applicationContext: Context) {
    val isConnectedToInternet: Boolean?
        get() = with(
            applicationContext.getSystemService(Context.CONNECTIVITY_SERVICE)
                    as ConnectivityManager
        ) {
            isConnectedToInternet()
        }
}

fun ConnectivityManager.isConnectedToInternet() = isConnected(getNetworkCapabilities(activeNetwork))

fun isConnected(networkCapabilities: NetworkCapabilities?): Boolean {
    return when (networkCapabilities) {
        null -> false
        else -> with(networkCapabilities) { hasTransport(TRANSPORT_CELLULAR) || hasTransport(TRANSPORT_WIFI) }
    }
}

If you use minSdkVersion < 23

class NetManager @Inject constructor(var applicationContext: Context) {
    val isConnectedToInternet: Boolean?
        get() = with(
            applicationContext.getSystemService(Context.CONNECTIVITY_SERVICE)
                    as ConnectivityManager
        ) {
            isConnectedToInternet()
        }
}

fun ConnectivityManager.isConnectedToInternet(): Boolean = if (Build.VERSION.SDK_INT < 23) {
    isConnected(activeNetworkInfo)
} else {
    isConnected(getNetworkCapabilities(activeNetwork))
}


fun isConnected(network: NetworkInfo?): Boolean {
    return when (network) {
        null -> false
        else -> with(network) { isConnected && (type == TYPE_WIFI || type == TYPE_MOBILE) }
    }
}

fun isConnected(networkCapabilities: NetworkCapabilities?): Boolean {
    return when (networkCapabilities) {
        null -> false
        else -> with(networkCapabilities) { hasTransport(TRANSPORT_CELLULAR) || hasTransport(TRANSPORT_WIFI) }
    }
}

There is an update to this answer as of March 2020 that supports API.15 through API.29, you can find it following to the original answer

Answer February 2019

To check if you're online:

boolean isOnline() {
    // Checking internet connectivity
    ConnectivityManager connectivityMgr = (ConnectivityManager) this.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo activeNetwork = null;
    if (connectivityMgr != null) {
        activeNetwork = connectivityMgr.getActiveNetworkInfo();
    }
    return activeNetwork != null;
}

Kotlin:

fun isOnline(): Boolean {
    val connectivityMgr = getSystemService(CONNECTIVITY_SERVICE) as ConnectivityManager

    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.P) {
        return connectivityMgr.activeNetworkInfo != null

    } else {

        for (network in connectivityMgr.allNetworks) { // added in API 21 (Lollipop)
            val networkCapabilities: NetworkCapabilities? =
                connectivityMgr.getNetworkCapabilities(network)
            return (networkCapabilities!!.hasCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET) &&
                    networkCapabilities.hasCapability(NetworkCapabilities.NET_CAPABILITY_VALIDATED) &&
                    (networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)
                            || networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR)
                            || networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_ETHERNET)))
        }
    }
    return false
}

To get the type of internet connectivity before/after android M

void internetType() {
    // Checking internet connectivity
    ConnectivityManager connectivityMgr = (ConnectivityManager) this.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo activeNetwork = null;
    if (connectivityMgr != null) {
        activeNetwork = connectivityMgr.getActiveNetworkInfo();
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            NetworkCapabilities nc = connectivityMgr.getNetworkCapabilities(connectivityMgr.getActiveNetwork());
            if (nc.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR)) {
                // connected to mobile data
            } else if (nc.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)) {
                // connected to wifi
            }
        } else {
            if (activeNetwork.getType() == ConnectivityManager.TYPE_WIFI) {
                // connected to wifi
            } else if (activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE) {
                // connected to mobile data
            }
        }
    }
}

All cases requires a permission to access network state

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

Update December 2020

As NetworkInfo is deprecated and as of API 29 from now we have to use ConnectivityManager.NetworkCallback with its network state change onAvailable() & onLost() callbacks.

Usage:

• You can either use this library, or directly use the below utility class which is a part of this library.

Features

• It's LifeCycle conscious by implementing LifecycleObserver to avoid memory leakage by doing some cleanup in onDestroy() method.
• It supports from API 15 (Ice Cream Sandwich) through API 29 (Android Q)
• For APIs prior to API 21, it uses a context-based BoradcastReceiver and NetworkInfo, and uses ConnectivityManager.NetworkCallback for API 21 and above.
• When both WiFi and cellular networks are on, then the connectivity listener won't interrupt when the WiFi is disconnected while transitioning to the cellular network.
• When the cellular network is on, then the connectivity listener won't interrupt when the WiFi is connected and being the active network (as this is the preferred network).
• If you're going to use the library, then no need to include this permission android.permission.ACCESS_NETWORK_STATE; but you have to include it if you're going to use the utility class.

Capabilities

• Get the current connectivity status (online / offline).
• Continuous checking/listening to the internet connection and triggering a callback when the device goes offline or online.
• Get the type of the active internet connection (WiFi or Cellular).
• Get the type of all available networks (WiFi or Cellular). >> Only supported on API 21+
• Get the number of all available networks >> Only supported on API 21+

@RequiresApi(api = Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1)
public class ConnectionUtil implements LifecycleObserver {

    private static final String TAG = "LOG_TAG";
    private ConnectivityManager mConnectivityMgr;
    private Context mContext;
    private NetworkStateReceiver mNetworkStateReceiver;
    
    /*
     * boolean indicates if my device is connected to the internet or not
     * */
    private boolean mIsConnected = false;
    private ConnectionMonitor mConnectionMonitor;


    /**
     * Indicates there is no available network.
     */
    private static final int NO_NETWORK_AVAILABLE = -1;


    /**
     * Indicates this network uses a Cellular transport.
     */
    public static final int TRANSPORT_CELLULAR = 0;


    /**
     * Indicates this network uses a Wi-Fi transport.
     */
    public static final int TRANSPORT_WIFI = 1;


    public interface ConnectionStateListener {
        void onAvailable(boolean isAvailable);
    }


    public ConnectionUtil(Context context) {
        mContext = context;
        mConnectivityMgr = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        ((AppCompatActivity) mContext).getLifecycle().addObserver(this);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            mConnectionMonitor = new ConnectionMonitor();
            NetworkRequest networkRequest = new NetworkRequest.Builder()
                    .addTransportType(NetworkCapabilities.TRANSPORT_CELLULAR)
                    .addTransportType(NetworkCapabilities.TRANSPORT_WIFI)
                    .build();
            mConnectivityMgr.registerNetworkCallback(networkRequest, mConnectionMonitor);
        }

    }


    /**
     * Returns true if connected to the internet, and false otherwise
     *
     * <p>
     * NetworkInfo is deprecated in API 29
     * https://developer.android.com/reference/android/net/NetworkInfo
     * <p>
     * getActiveNetworkInfo() is deprecated in API 29
     * https://developer.android.com/reference/android/net/ConnectivityManager#getActiveNetworkInfo()
     * <p>
     * getNetworkInfo(int) is deprecated as of API 23
     * https://developer.android.com/reference/android/net/ConnectivityManager#getNetworkInfo(int)
     */
    public boolean isOnline() {

        mIsConnected = false;

        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.P) {
            // Checking internet connectivity
            NetworkInfo activeNetwork = null;
            if (mConnectivityMgr != null) {
                activeNetwork = mConnectivityMgr.getActiveNetworkInfo(); // Deprecated in API 29
            }
            mIsConnected = activeNetwork != null;

        } else {
            Network[] allNetworks = mConnectivityMgr.getAllNetworks(); // added in API 21 (Lollipop)

            for (Network network : allNetworks) {
                NetworkCapabilities networkCapabilities = mConnectivityMgr.getNetworkCapabilities(network);
                if (networkCapabilities != null) {
                    if (networkCapabilities.hasCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET) &&
                            networkCapabilities.hasCapability(NET_CAPABILITY_VALIDATED))
                        if (networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)
                                || networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR)
                                || networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_ETHERNET))
                            mIsConnected = true;
                }
            }

        }

        return mIsConnected;

    }


    /**
     * Returns
     * <p> <p>
     * <p><p> NO_NETWORK_AVAILABLE >>> when you're offline
     * <p><p> TRANSPORT_CELLULAR >> When Cellular is the active network
     * <p><p> TRANSPORT_WIFI >> When Wi-Fi is the Active network
     * <p>
     */
    public int getActiveNetwork() {

        NetworkInfo activeNetwork = mConnectivityMgr.getActiveNetworkInfo(); // Deprecated in API 29
        if (activeNetwork != null)

            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                NetworkCapabilities capabilities = mConnectivityMgr.getNetworkCapabilities(mConnectivityMgr.getActiveNetwork());
                if (capabilities != null)
                    if (capabilities.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR)) {
                        // connected to mobile data
                        return TRANSPORT_CELLULAR;

                    } else if (capabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)) {
                        // connected to wifi
                        return TRANSPORT_WIFI;
                    }

            } else {
                if (activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE) { // Deprecated in API 28
                    // connected to mobile data
                    return TRANSPORT_CELLULAR;

                } else if (activeNetwork.getType() == ConnectivityManager.TYPE_WIFI) { // Deprecated in API 28
                    // connected to wifi
                    return TRANSPORT_WIFI;
                }
            }
        return NO_NETWORK_AVAILABLE;
    }


    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    public int getAvailableNetworksCount() {

        int count = 0;

        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {
            Network[] allNetworks = mConnectivityMgr.getAllNetworks(); // added in API 21 (Lollipop)
            for (Network network : allNetworks) {
                NetworkCapabilities networkCapabilities = mConnectivityMgr.getNetworkCapabilities(network);
                if (networkCapabilities != null)
                    if (networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)
                            || networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR))
                        count++;
            }

        }

        return count;
    }
    

    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    public List<Integer> getAvailableNetworks() {

        List<Integer> activeNetworks = new ArrayList<>();

        Network[] allNetworks; // added in API 21 (Lollipop)
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {
            allNetworks = mConnectivityMgr.getAllNetworks();
            for (Network network : allNetworks) {
                NetworkCapabilities networkCapabilities = mConnectivityMgr.getNetworkCapabilities(network);
                if (networkCapabilities != null) {
                    if (networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI))
                        activeNetworks.add(TRANSPORT_WIFI);

                    if (networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR))
                        activeNetworks.add(TRANSPORT_CELLULAR);

                }
            }
        }

        return activeNetworks;
    }


    public void onInternetStateListener(ConnectionStateListener listener) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
            mNetworkStateReceiver = new NetworkStateReceiver(listener);
            IntentFilter intentFilter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);
            mContext.registerReceiver(mNetworkStateReceiver, intentFilter);

        } else {
            mConnectionMonitor.setOnConnectionStateListener(listener);
        }
    }


    @OnLifecycleEvent(Lifecycle.Event.ON_DESTROY)
    public void onDestroy() {
        Log.d(TAG, "onDestroy");
        ((AppCompatActivity) mContext).getLifecycle().removeObserver(this);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            if (mConnectionMonitor != null)
                mConnectivityMgr.unregisterNetworkCallback(mConnectionMonitor);
        } else {
            if (mNetworkStateReceiver != null)
                mContext.unregisterReceiver(mNetworkStateReceiver);
        }

    }


    public class NetworkStateReceiver extends BroadcastReceiver {

        ConnectionStateListener mListener;

        public NetworkStateReceiver(ConnectionStateListener listener) {
            mListener = listener;
        }

        @Override
        public void onReceive(Context context, Intent intent) {
            if (intent.getExtras() != null) {

                NetworkInfo activeNetworkInfo = mConnectivityMgr.getActiveNetworkInfo(); // deprecated in API 29

                /*
                 * activeNetworkInfo.getState() deprecated in API 28
                 * NetworkInfo.State.CONNECTED deprecated in API 29
                 * */
                if (!mIsConnected && activeNetworkInfo != null && activeNetworkInfo.getState() == NetworkInfo.State.CONNECTED) {
                    Log.d(TAG, "onReceive: " + "Connected To: " + activeNetworkInfo.getTypeName());
                    mIsConnected = true;
                    mListener.onAvailable(true);

                } else if (intent.getBooleanExtra(ConnectivityManager.EXTRA_NO_CONNECTIVITY, Boolean.FALSE)) {
                    if (!isOnline()) {
                        mListener.onAvailable(false);
                        mIsConnected = false;
                    }

                }

            }
        }
    }


    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    public class ConnectionMonitor extends ConnectivityManager.NetworkCallback {

        private ConnectionStateListener mConnectionStateListener;

        void setOnConnectionStateListener(ConnectionStateListener connectionStateListener) {
            mConnectionStateListener = connectionStateListener;
        }

        @Override
        public void onAvailable(@NonNull Network network) {

            if (mIsConnected)
                return;

            Log.d(TAG, "onAvailable: ");

            if (mConnectionStateListener != null) {
                mConnectionStateListener.onAvailable(true);
                mIsConnected = true;
            }

        }

        @Override
        public void onLost(@NonNull Network network) {

            if (getAvailableNetworksCount() == 0) {
                if (mConnectionStateListener != null)
                    mConnectionStateListener.onAvailable(false);
                mIsConnected = false;
            }

        }

    }

}

Kotlin version

class ConnectionUtil(var mContext: Context) : LifecycleObserver {

    private val TAG = "LOG_TAG"

    companion object NetworkType {

        /**
         * Indicates this network uses a Cellular transport.
         */
        const val TRANSPORT_CELLULAR = 0

        /**
         * Indicates this network uses a Wi-Fi transport.
         */
       const val TRANSPORT_WIFI = 1

    }

    private var mConnectivityMgr: ConnectivityManager? = null

    //    private var mContext: Context? = null
    private var mNetworkStateReceiver: NetworkStateReceiver? = null

    /*
     * boolean indicates if my device is connected to the internet or not
     * */
    private var mIsConnected = false
    private var mConnectionMonitor: ConnectionMonitor? = null


    /**
     * Indicates there is no available network.
     */
    private val NO_NETWORK_AVAILABLE = -1


    interface ConnectionStateListener {
        fun onAvailable(isAvailable: Boolean)
    }

    init {
        mConnectivityMgr =
            mContext.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
        (mContext as AppCompatActivity?)!!.lifecycle.addObserver(this)
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            mConnectionMonitor = ConnectionMonitor()
            val networkRequest = NetworkRequest.Builder()
                .addTransportType(NetworkCapabilities.TRANSPORT_CELLULAR)
                .addTransportType(NetworkCapabilities.TRANSPORT_WIFI)
                .build()
            mConnectivityMgr!!.registerNetworkCallback(networkRequest, mConnectionMonitor!!)
        }
    }


    /**
     * Returns true if connected to the internet, and false otherwise
     *
     * NetworkInfo is deprecated in API 29
     * https://developer.android.com/reference/android/net/NetworkInfo
     *
     * getActiveNetworkInfo() is deprecated in API 29
     * https://developer.android.com/reference/android/net/ConnectivityManager#getActiveNetworkInfo()
     *
     * getNetworkInfo(int) is deprecated as of API 23
     * https://developer.android.com/reference/android/net/ConnectivityManager#getNetworkInfo(int)
     */
    fun isOnline(): Boolean {
        mIsConnected = false
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.P) {
            // Checking internet connectivity
            var activeNetwork: NetworkInfo? = null
            if (mConnectivityMgr != null) {
                activeNetwork = mConnectivityMgr!!.activeNetworkInfo // Deprecated in API 29
            }
            mIsConnected = activeNetwork != null
        } else {
            val allNetworks = mConnectivityMgr!!.allNetworks // added in API 21 (Lollipop)
            for (network in allNetworks) {
                val networkCapabilities = mConnectivityMgr!!.getNetworkCapabilities(network)
                if (networkCapabilities != null) {
                    if (networkCapabilities.hasCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET) &&
                        networkCapabilities.hasCapability(NetworkCapabilities.NET_CAPABILITY_VALIDATED)
                    ) 
                        if (networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)
                            || networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR)
                            || networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_ETHERNET)
                        ) mIsConnected = true
                }
            }
        }
        return mIsConnected
    }


    /**
     * Returns:
     *
     * NO_NETWORK_AVAILABLE >>> when you're offline
     * TRANSPORT_CELLULAR >> When Cellular is the active network
     * TRANSPORT_WIFI >> When Wi-Fi is the Active network
     */
    fun getActiveNetwork(): Int {
        val activeNetwork = mConnectivityMgr!!.activeNetworkInfo // Deprecated in API 29
        if (activeNetwork != null) if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            val capabilities = mConnectivityMgr!!.getNetworkCapabilities(
                mConnectivityMgr!!.activeNetwork
            )
            if (capabilities != null) if (capabilities.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR)) {
                // connected to mobile data
                return TRANSPORT_CELLULAR
            } else if (capabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)) {
                // connected to wifi
                return TRANSPORT_WIFI
            }
        } else {
            if (activeNetwork.type == ConnectivityManager.TYPE_MOBILE) { // Deprecated in API 28
                // connected to mobile data
                return TRANSPORT_CELLULAR
            } else if (activeNetwork.type == ConnectivityManager.TYPE_WIFI) { // Deprecated in API 28
                // connected to wifi
                return TRANSPORT_WIFI
            }
        }
        return NO_NETWORK_AVAILABLE
    }


    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    fun getAvailableNetworksCount(): Int {
        var count = 0
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            val allNetworks = mConnectivityMgr!!.allNetworks // added in API 21 (Lollipop)
            for (network in allNetworks) {
                val networkCapabilities = mConnectivityMgr!!.getNetworkCapabilities(network)
                if (networkCapabilities != null) if (networkCapabilities.hasTransport(
                        NetworkCapabilities.TRANSPORT_WIFI
                    )
                    || networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR)
                ) count++
            }
        }
        return count
    }

    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    fun getAvailableNetworks(): List<Int> {
        val activeNetworks: MutableList<Int> = ArrayList()
        val allNetworks: Array<Network> // added in API 21 (Lollipop)
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            allNetworks = mConnectivityMgr!!.allNetworks
            for (network in allNetworks) {
                val networkCapabilities = mConnectivityMgr!!.getNetworkCapabilities(network)
                if (networkCapabilities != null) {
                    if (networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)) activeNetworks.add(
                        TRANSPORT_WIFI
                    )
                    if (networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR)) activeNetworks.add(
                        TRANSPORT_CELLULAR
                    )
                }
            }
        }
        return activeNetworks
    }


    fun onInternetStateListener(listener: ConnectionStateListener) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
            mNetworkStateReceiver = NetworkStateReceiver(listener)
            val intentFilter = IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION)
            mContext.registerReceiver(mNetworkStateReceiver, intentFilter)
        } else {
            mConnectionMonitor!!.setOnConnectionStateListener(listener)
        }
    }


    @OnLifecycleEvent(Lifecycle.Event.ON_DESTROY)
    fun onDestroy() {
        Log.d(TAG, "onDestroy")
        (mContext as AppCompatActivity?)!!.lifecycle.removeObserver(this)
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            if (mConnectionMonitor != null) mConnectivityMgr!!.unregisterNetworkCallback(
                mConnectionMonitor!!
            )
        } else {
            if (mNetworkStateReceiver != null) mContext.unregisterReceiver(mNetworkStateReceiver)
        }
    }


    inner class NetworkStateReceiver(var mListener: ConnectionStateListener) :
        BroadcastReceiver() {
        override fun onReceive(context: Context, intent: Intent) {
            if (intent.extras != null) {
                val activeNetworkInfo: NetworkInfo? =
                    mConnectivityMgr?.getActiveNetworkInfo() // deprecated in API 29

                /*
                 * activeNetworkInfo.getState() deprecated in API 28
                 * NetworkInfo.State.CONNECTED deprecated in API 29
                 * */if (!mIsConnected && activeNetworkInfo != null && activeNetworkInfo.state == NetworkInfo.State.CONNECTED) {
                    mIsConnected = true
                    mListener.onAvailable(true)
                } else if (intent.getBooleanExtra(
                        ConnectivityManager.EXTRA_NO_CONNECTIVITY,
                        java.lang.Boolean.FALSE
                    )
                ) {
                    if (!isOnline()) {
                        mListener.onAvailable(false)
                        mIsConnected = false
                    }
                }
            }
        }
    }

    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    inner class ConnectionMonitor : NetworkCallback() {
        private var mConnectionStateListener: ConnectionStateListener? = null
        fun setOnConnectionStateListener(connectionStateListener: ConnectionStateListener?) {
            mConnectionStateListener = connectionStateListener
        }

        override fun onAvailable(network: Network) {
            if (mIsConnected) return
            Log.d(TAG, "onAvailable: ")
            if (mConnectionStateListener != null) {
                mConnectionStateListener!!.onAvailable(true)
                mIsConnected = true
            }
        }

        override fun onLost(network: Network) {
            if (getAvailableNetworksCount() == 0) {
                mConnectionStateListener?.onAvailable(false)
                mIsConnected = false
            }
        }
    }

}

Kotlin version:

fun isInternetOn(context: Context): Boolean {
   val cm = context.getSystemService(Context.CONNECTIVITY_SERVICE) as? ConnectivityManager
   val activeNetwork = cm?.activeNetworkInfo
   return activeNetwork != null && activeNetwork.isConnected
}

Here's how I check if the current network is using cellular or not on the latest Android versions:

val isCellular: Boolean get() {
    val cm = getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
    return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        cm.getNetworkCapabilities(cm.activeNetwork).hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR)
    } else {
        cm.activeNetworkInfo?.type == ConnectivityManager.TYPE_MOBILE
    }
}

It is good to check whether your network is connected to Internet:

@Suppress("DEPRECATION")
fun isNetworkAvailable(context: Context): Boolean {
    try {
        val cm = context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
        return if (Build.VERSION.SDK_INT > 22) {
            val an = cm.activeNetwork ?: return false
            val capabilities = cm.getNetworkCapabilities(an) ?: return false
            capabilities.hasCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET)
        } else {
            val a = cm.activeNetworkInfo ?: return false
            a.isConnected && (a.type == ConnectivityManager.TYPE_WIFI || a.type == ConnectivityManager.TYPE_MOBILE)
        }
    } catch (e: Exception) {
        e.printStackTrace()
    }
    return false
}

In order to be on the safe side, i would suggest to use also method

NetworkInfo.isConnected()

The whole method could be as below:

/**
 * Checking whether network is connected
 * @param context Context to get {@link ConnectivityManager}
 * @return true if Network is connected, else false
 */
public static boolean isConnected(Context context){
    ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
    if (activeNetwork != null && activeNetwork.isConnected()) {
        int networkType = activeNetwork.getType();
        return networkType == ConnectivityManager.TYPE_WIFI || networkType == ConnectivityManager.TYPE_MOBILE;
    } else {
        return false;
    }
}

This can help someone Kotlin

fun isNetworkConnected(context: Context) : Boolean {
        val connectivityManager = context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
        val capabilities =  connectivityManager.getNetworkCapabilities(connectivityManager.activeNetwork)
        capabilities.also {
            if (it != null){
                if (it.hasTransport(NetworkCapabilities.TRANSPORT_WIFI))
                    return true
                else if (it.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR)){
                    return true
                }
            }
        }
        return false
    }

(Almost) All answers are deprecated in Android P, so here is C# solution (which is easy to follow for Java developers)

public bool IsOnline(Context context)
{
    var cm = (ConnectivityManager)context.GetSystemService(Context.ConnectivityService);

    if (cm == null) return false;

    if (Build.VERSION.SdkInt < BuildVersionCodes.M)
    {
        var ni = cm.ActiveNetworkInfo;

        if (ni == null) return false;

        return ni.IsConnected && (ni.Type == ConnectivityType.Wifi || ni.Type == ConnectivityType.Mobile);
    }

    return cm.GetNetworkCapabilities(cm.ActiveNetwork).HasTransport(Android.Net.TransportType.Wifi)
        || cm.GetNetworkCapabilities(cm.ActiveNetwork).HasTransport(Android.Net.TransportType.Cellular);
}   

The key here is Android.Net.TransportType

Something like this:

public boolean hasConnection(final Context context){
    ConnectivityManager cm = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo activeNW = cm.getActiveNetworkInfo();
    if (activeNW != null && activeNW.isConnected())
    {
        return true;
    }
    return false;
}

And in the main program body:

if(hasConnection(this)) {
    Toast.makeText(this, "Active networks OK ", Toast.LENGTH_LONG).show();
    getAccountData(token, tel);
}
else  Toast.makeText(this, "No active networks... ", Toast.LENGTH_LONG).show();

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" />

public boolean isConnectedToWifi(Context context) {
    ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    if (connectivityManager == null) {
        return false;
    }

    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) {
        Network network = connectivityManager.getActiveNetwork();
        NetworkCapabilities capabilities = connectivityManager.getNetworkCapabilities(network);
        if (capabilities == null) {
            return false;
        }
        return capabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI);
    } else {
        NetworkInfo networkInfo = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
        if (networkInfo == null) {
            return false;
        }
        return networkInfo.isConnected();
    }
}

This works for me in Kotlin. Lot of API's are deprecated in Network Manager class so below answer cover all API support.

fun isNetworkAvailable(context: Context): Boolean {
    var result = false
    (context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager).apply {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                result = isCapableNetwork(this,this.activeNetwork)
            } else {
                val networkInfos = this.allNetworks
                for (tempNetworkInfo in networkInfos) {
                    if(isCapableNetwork(this,tempNetworkInfo))
                        result =  true
                }
            }
        }

    return result
}

fun isCapableNetwork(cm: ConnectivityManager,network: Network?): Boolean{
     cm.getNetworkCapabilities(network)?.also {
        if (it.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)) {
            return true
        } else if (it.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR)) {
            return true
        }
    }
    return false
}

You will also add below

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

connectivityManager.getActiveNetwork() is not found in below android M (API 28). networkInfo.getState() is deprecated above android L.

So, final answer is:

public static boolean isConnectingToInternet(Context mContext) {
    if (mContext == null) return false;

    ConnectivityManager connectivityManager = (ConnectivityManager) mContext.getSystemService(Context.CONNECTIVITY_SERVICE);
    if (connectivityManager != null) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            final Network network = connectivityManager.getActiveNetwork();
            if (network != null) {
                final NetworkCapabilities nc = connectivityManager.getNetworkCapabilities(network);

                return (nc.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR) ||
                        nc.hasTransport(NetworkCapabilities.TRANSPORT_WIFI));
            }
        } else {
            NetworkInfo[] networkInfos = connectivityManager.getAllNetworkInfo();
            for (NetworkInfo tempNetworkInfo : networkInfos) {
                if (tempNetworkInfo.isConnected()) {
                    return true;
                }
            }
        }
    }
    return false;
}

check if Internet is available

@RequiresPermission(allOf = [
    Manifest.permission.ACCESS_NETWORK_STATE, 
    Manifest.permission.INTERNET
])
fun isInternetAvailable(context: Context): Boolean {
    val connectivityManager = context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager?
    val activeNetworkInfo = connectivityManager!!.activeNetworkInfo
    return activeNetworkInfo != null && activeNetworkInfo.isConnected
}

Updated answer (19:07:2018):

This method will help you check if the internet connection is available.

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

    if (connectivityManager != null) {
        NetworkInfo activeNetwork = connectivityManager.getActiveNetworkInfo();
        return (activeNetwork != null && activeNetwork.isConnectedOrConnecting());
    } else {
        return false;
    }
}

Old answer:

For best code reuse practice, improvising Cheese Bread answer.

public static boolean isNetworkAvailable(Context context) {
    int[] networkTypes = {ConnectivityManager.TYPE_MOBILE,
            ConnectivityManager.TYPE_WIFI};
    try {
        ConnectivityManager connectivityManager =
                (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        for (int networkType : networkTypes) {
            NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
            if (activeNetworkInfo != null &&
                    activeNetworkInfo.getType() == networkType)
                return true;
        }
    } catch (Exception e) {
        return false;
    }
    return false;
}

The code can be placed in Util class and can be used to check whether the phone is connected to Internet via Wifi or Mobile Internet from any part of your application.

This will work in Android 10 as well. It will return true if connected to the internet else return false.

private fun isOnline(): Boolean {
        val connectivityManager =
                getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
        val capabilities =
                connectivityManager.getNetworkCapabilities(connectivityManager.activeNetwork)
        if (capabilities != null) {
            when {
                capabilities.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR) -> {
                    Log.i("Internet", "NetworkCapabilities.TRANSPORT_CELLULAR")
                    return true
                }
                capabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI) -> {
                    Log.i("Internet", "NetworkCapabilities.TRANSPORT_WIFI")
                    return true
                }
                capabilities.hasTransport(NetworkCapabilities.TRANSPORT_ETHERNET) -> {
                    Log.i("Internet", "NetworkCapabilities.TRANSPORT_ETHERNET")
                    return true
                }
            }
        }
        return false
    }

As Cheese Bread suggested, use getActiveNetworkInfo()

getActiveNetworkInfo

Added in API level 1

NetworkInfo getActiveNetworkInfo ()

Returns details about the currently active default data network. When connected, this network is the default route for outgoing connections. You should always check isConnected() before initiating network traffic. This may return null when there is no default network. This method requires the caller to hold the permission ACCESS_NETWORK_STATE. Returns NetworkInfo a NetworkInfo object for the current default network or null if no default network is currently active.

Reference : Android Studio

 public final boolean isInternetOn() {

    // get Connectivity Manager object to check connection
    ConnectivityManager connec =
            (ConnectivityManager)getSystemService(getBaseContext().CONNECTIVITY_SERVICE);

    // Check for network connections
    if ( connec.getActiveNetworkInfo().getState() == android.net.NetworkInfo.State.CONNECTED ||
            connec.getActiveNetworkInfo().getState() == android.net.NetworkInfo.State.CONNECTING ) {

        // if connected with internet

        Toast.makeText(this, connec.getActiveNetworkInfo().getTypeName(), Toast.LENGTH_LONG).show();
        return true;

    } else if (
            connec.getActiveNetworkInfo().getState() == android.net.NetworkInfo.State.DISCONNECTED ||
                    connec.getActiveNetworkInfo().getState() == android.net.NetworkInfo.State.DISCONNECTED  ) {

        Toast.makeText(this, " Not Connected ", Toast.LENGTH_LONG).show();
        return false;
    }
    return false;
}

now call the method , for safe use try catch

try {
    if (isInternetOn()) { /* connected actions */ }
    else { /* not connected actions */ }
} catch (Exception e){
  Toast.makeText(this, e.getMessage(), Toast.LENGTH_SHORT).show();
}

And do not forget to add:

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

The accepted answer is deprecated in version 28 so here is the solution that I am using in my project.

Returns connection type. false: no Internet Connection; true: mobile data || wifi

public static boolean isNetworkConnected(Context context) { 
    boolean result = false; 
    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 = true;
                } else if (capabilities.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR)) {
                    result = true;
                }
            }
        }
    } else {
        if (cm != null) {
            NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
            if (activeNetwork != null) {
                // connected to the internet
                if (activeNetwork.getType() == ConnectivityManager.TYPE_WIFI) {
                    result = true;
                } else if (activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE) {
                    result = true;
                }
            }
        }
    }
    return result;
}

We may need to check internet connectivity more than once. So it will be easier for us if we write the code block in an extension method of Context. Below are my helper extensions for Context and Fragment.

Checking Internet Connection

fun Context.hasInternet(): Boolean {
    val connectivityManager = getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
    return if (Build.VERSION.SDK_INT < 23) {
        val activeNetworkInfo = connectivityManager.activeNetworkInfo
        activeNetworkInfo != null && activeNetworkInfo.isConnected
    } else {
        val nc = connectivityManager.getNetworkCapabilities(connectivityManager.activeNetwork)
        if (nc == null) {
            false
        } else {
            nc.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR) ||
                    nc.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)
        }
    }
}

Other Extensions

fun Context.hasInternet(notifyNoInternet: Boolean = true, trueFunc: (internet: Boolean) -> Unit) {
    if (hasInternet()) {
        trueFunc(true)
    } else if (notifyNoInternet) {
        Toast.makeText(this, "No Internet Connection!", Toast.LENGTH_SHORT).show()
    }
}

fun Context.hasInternet(
    trueFunc: (internet: Boolean) -> Unit,
    falseFunc: (internet: Boolean) -> Unit
) {
    if (hasInternet()) {
        trueFunc(true)
    } else {
        falseFunc(true)
    }
}

fun Fragment.hasInternet(): Boolean = context!!.hasInternet()

fun Fragment.hasInternet(notifyNoInternet: Boolean = true, trueFunc: (internet: Boolean) -> Unit) =
    context!!.hasInternet(notifyNoInternet, trueFunc)

fun Fragment.hasInternet(
    trueFunc: (internet: Boolean) -> Unit, falseFunc: (internet: Boolean) -> Unit
) = context!!.hasInternet(trueFunc, falseFunc)