Find out application is connected to WIFI or cellular

Network.java

 /**
  * Get reference to the connectivity manager
  */
 ConnectivityManager connectivityManager =
                (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

 /**
  * Find out whether device is connected to wifi or cellular at the moment
  */
 public NetworkType getNetworkType() {
        boolean isConnectedToWifi;
        boolean isConnectedToCellular;

        if (connectivityManager == null) {
            Log.e(TAG, "Connectivity manager not found!");
            return NetworkType.ERROR;
        }

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            Network activeNetwork = connectivityManager.getActiveNetwork();
            if (activeNetwork == null) {
                Log.e(TAG, "Active network not found for API >= 23");
                return NetworkType.ERROR;
            } else {
                NetworkCapabilities nc = connectivityManager.getNetworkCapabilities(activeNetwork);
                if (nc == null) {
                    Log.e(TAG, "Network capabilities not found for API >= 23");
                    return NetworkType.ERROR;
                } else {
                    isConnectedToCellular = nc.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR);
                    isConnectedToWifi = nc.hasTransport(NetworkCapabilities.TRANSPORT_WIFI);
                }
            }
        } else {
            NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
            if (networkInfo != null) {
                if (networkInfo.isConnectedOrConnecting()) {
                    isConnectedToCellular =
                            networkInfo.getType() == ConnectivityManager.TYPE_MOBILE;
                    isConnectedToWifi =
                            networkInfo.getType() == ConnectivityManager.TYPE_WIFI;
                } else {
                    Log.e(TAG, "Active network not found for API < 23");
                    return NetworkType.NO_NETWORK;
                }
            } else {
                Log.e(TAG, "NetworkInfo not found for API < 23");
                return NetworkType.ERROR;
            }
        }

        if (isConnectedToCellular && isConnectedToWifi) {
            return NetworkType.WIFI;
        } else if (isConnectedToCellular) {
            return NetworkType.CELLULAR;
        } else if (isConnectedToWifi) {
            return NetworkType.WIFI;
        } else {
            return NetworkType.NO_NETWORK;
        }
 }

 /**
  * Enum which specifies the type of network
  */
 public enum NetworkType {
     WIFI,           /* wifi network */
     CELLULAR,       /* cellular network */
     NO_NETWORK,     /* no network */
     ERROR           /* error while figuring out the network type */
 }