Internet connectivity check

[chakshuharsh]

• How this app is checking whether it is connected to the internet or not?

• Is this part of code doing something?

val isOffline = networkMonitor.isOnline
       .map(Boolean::not)
       .stateIn(
           scope = coroutineScope,
           started = SharingStarted.WhileSubscribed(5_000),
           initialValue = false,
       )

[Sagar0-0]

If you see this class ConnectivityManagerNetworkMonitor:

    override val isOnline: Flow<Boolean> = callbackFlow {
        val connectivityManager = context.getSystemService<ConnectivityManager>()
        if (connectivityManager == null) {
            channel.trySend(false)
            channel.close()
            return@callbackFlow
        }

        /**
         * The callback's methods are invoked on changes to *any* network matching the [NetworkRequest],
         * not just the active network. So we can simply track the presence (or absence) of such [Network].
         */
        val callback = object : NetworkCallback() {

            private val networks = mutableSetOf<Network>()

            override fun onAvailable(network: Network) {
                networks += network
                channel.trySend(true)
            }

            override fun onLost(network: Network) {
                networks -= network
                channel.trySend(networks.isNotEmpty())
            }
        }

        val request = Builder()
            .addCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET)
            .build()
        connectivityManager.registerNetworkCallback(request, callback)

        /**
         * Sends the latest connectivity status to the underlying channel.
         */
        channel.trySend(connectivityManager.isCurrentlyConnected())

        awaitClose {
            connectivityManager.unregisterNetworkCallback(callback)
        }
    }
        .conflate()

It uses the ConnectivityManager system service to check whether the Network is there. Not that, we are exposing it as a Flow object here.

In your snippet,
We are simply converting this isOnline to isOffline using map function and then into a StateFlow using the stateIn(). Learn more about stateIn() from here