Check the connectivity status in Android

ConnectivityChangeReceiver.kt

class ConnectivityChangeReceiver (val listener : ConnectivityEventsListener?) : BroadcastReceiver() {
    interface ConnectivityEventsListener {
        fun onConnected() {}
        fun onConnecting() {}
        fun onDisconnected() {}
        fun onDisconnecting() {}
        fun onSuspended() {}
        fun onUnknown() {}
    }

    override fun onReceive(context: Context, intent: Intent) {
        val netInfo: NetworkInfo? = (context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager).activeNetworkInfo
        when (netInfo?.state) {
            NetworkInfo.State.CONNECTED -> listener?.onConnected()
            NetworkInfo.State.CONNECTING -> listener?.onConnecting()
            NetworkInfo.State.DISCONNECTED -> listener?.onDisconnected()
            NetworkInfo.State.DISCONNECTING -> listener?.onDisconnecting()
            NetworkInfo.State.SUSPENDED -> listener?.onSuspended()
            NetworkInfo.State.UNKNOWN -> listener?.onUnknown()
        }
    }

    fun register(context: Context) : ConnectivityChangeReceiver{
        val intentFilter = IntentFilter()
        intentFilter.addAction(ConnectivityManager.CONNECTIVITY_ACTION)
        context.registerReceiver(this, intentFilter)
        return this
    }

    fun unregister(context: Context) : ConnectivityChangeReceiver {
        context.unregisterReceiver(this)
        return this
    }
}