How to check whether the android device has an internet connectivity or not ??

Step 1 :  Make a Class for this purpose named "NetworkConnectivity"

class NetworkConnectivity(
    private val context : Context
) {
    private var connectivityManager: ConnectivityManager? = null
    private var networkCallback: NetworkCallback? = null

    var isConnected =   MutableStateFlow(false)
    private set

    init{
        connectivityManager = context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
    }


    fun registerNetworkCallback(){
        networkCallback = object : NetworkCallback() {
            override fun onAvailable(network: Network) {
                isConnected.update { true }
            }

            override fun onLost(network: Network) {
                isConnected.update { false }
            }
        }

        val networkRequest = NetworkRequest
            .Builder()
            .addTransportType(NetworkCapabilities.TRANSPORT_WIFI)
            .addTransportType(NetworkCapabilities.TRANSPORT_CELLULAR)
            .build()


        connectivityManager?.registerNetworkCallback(networkRequest, networkCallback!!,)
    }

    fun unRegisterNetworkCallback(){
        connectivityManager?.unregisterNetworkCallback(networkCallback!!)
        networkCallback = null
    }
}

Step 2 :-  Inside the mainViewModel which will exists for whole app lifecycle paste the below code 

class MainViewModel : ViewModel() {

    private var networkConnectivity : NetworkConnectivity? = null

    var isConnected =   MutableStateFlow(false)
        private set

    fun registerNetwork(context: Context){
        networkConnectivity = NetworkConnectivity(context)
        networkConnectivity?.registerNetworkCallback()
        isConnected = networkConnectivity?.isConnected!!
    }

    override fun onCleared() {
        networkConnectivity?.unRegisterNetworkCallback()
    }
}

Step 3 :- create the mainviewmodel instance on app create and register the network callback 

class MainActivity : ComponentActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        val mainViewModel : MainViewModel by viewModels()
        mainViewModel.registerNetwork(applicationContext)

        enableEdgeToEdge()
        setContent {
            HomeTutorNepalTheme {
                val isConnected = mainViewModel.isConnected.collectAsState()


                Scaffold {
                    Text(
                        text = isConnected.value.toString(),
                        modifier = Modifier.padding(it)
                    )

                }



            }
        }
    }

Further on we can create an instance of mainViewModel on any compose and check for the live status of our connectivity .

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