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Monitor network connectivity in android using callbackFlow.
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| interface NetworkMonitor { | |
| val isOnline: Flow<Boolean> | |
| } | |
| class NetworkMonitorImpl @Inject constructor( | |
| @ApplicationContext private val context: Context, | |
| @Dispatcher(IO) private val ioDispatcher: CoroutineDispatcher, | |
| ) : NetworkMonitor { | |
| override val isOnline: Flow<Boolean> | |
| get() = callbackFlow { | |
| val connectivityManager = context.getSystemService<ConnectivityManager>() | |
| if (connectivityManager == null) { | |
| channel.trySend(false) | |
| channel.close() | |
| return@callbackFlow | |
| } | |
| 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) | |
| channel.trySend(connectivityManager.isCurrentlyConnected()) | |
| awaitClose { | |
| connectivityManager.unregisterNetworkCallback(callback) | |
| } | |
| }.flowOn(ioDispatcher).conflate() | |
| @Suppress("DEPRECATION") | |
| private fun ConnectivityManager.isCurrentlyConnected() = when { | |
| VERSION.SDK_INT >= VERSION_CODES.M -> | |
| activeNetwork | |
| ?.let(::getNetworkCapabilities) | |
| ?.hasCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET) | |
| else -> activeNetworkInfo?.isConnected | |
| } ?: false | |
| } |
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