NetworkStatusTracker_full.kt

import android.content.Context
import android.net.ConnectivityManager
import android.net.Network
import android.net.NetworkCapabilities
import android.net.NetworkRequest
import android.os.Bundle
import android.widget.TextView
import androidx.appcompat.app.AppCompatActivity
import androidx.lifecycle.ViewModel
import androidx.lifecycle.ViewModelProvider
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.FlowPreview
import kotlinx.coroutines.channels.awaitClose
import kotlinx.coroutines.flow.Flow
import kotlinx.coroutines.flow.callbackFlow
import kotlinx.coroutines.flow.distinctUntilChanged
import kotlinx.coroutines.flow.flatMapConcat
import kotlinx.coroutines.flow.map

class MainActivity : AppCompatActivity() {

    private val viewModel: NetworkStatusViewModel by lazy {
        ViewModelProvider(
            this,
            object : ViewModelProvider.Factory {
                override fun <T : ViewModel?> create(modelClass: Class<T>): T {
                    val networkStatusTracker = NetworkStatusTracker(this@MainActivity)
                    return NetworkStatusViewModel(networkStatusTracker) as T
                }
            },
        ).get(NetworkStatusViewModel::class.java)
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        viewModel.state.observe(this) { state ->
            findViewById<TextView>(R.id.textView).text = when (state) {
                MyState.Fetched -> "Fetched"
                MyState.Error -> "Error"
            }
        }
    }
}

sealed class MyState {
    object Fetched : MyState()
    object Error : MyState()
}

class NetworkStatusViewModel(
    networkStatusTracker: NetworkStatusTracker,
) : ViewModel() {

    val state =
        networkStatusTracker.networkStatus
            .map(
                onAvailable = { MyState.Fetched },
                onUnavailable = { MyState.Error },
            )
            .asLiveData(Dispatchers.IO)
}

sealed class NetworkStatus {
    object Available : NetworkStatus()
    object Unavailable : NetworkStatus()
}

class NetworkStatusTracker(context: Context) {

    private val connectivityManager =
        context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager

    val networkStatus = callbackFlow<NetworkStatus> {
        val networkStatusCallback = object : ConnectivityManager.NetworkCallback() {
            override fun onUnavailable() {
                println("onUnavailable")
                offer(NetworkStatus.Unavailable)
            }

            override fun onAvailable(network: Network) {
                println("onAvailable")
                offer(NetworkStatus.Available)
            }

            override fun onLost(network: Network) {
                println("onLost")
                offer(NetworkStatus.Unavailable)
            }
        }

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

        awaitClose {
            connectivityManager.unregisterNetworkCallback(networkStatusCallback)
        }
    }
        .distinctUntilChanged()
}

@FlowPreview
inline fun <Result> Flow<NetworkStatus>.map(
    crossinline onUnavailable: suspend () -> Result,
    crossinline onAvailable: suspend () -> Result,
): Flow<Result> = map { status ->
    when (status) {
        NetworkStatus.Unavailable -> onUnavailable()
        NetworkStatus.Available -> onAvailable()
    }
}

@FlowPreview
inline fun <Result> Flow<NetworkStatus>.flatMap(
    crossinline onUnavailable: suspend () -> Flow<Result>,
    crossinline onAvailable: suspend () -> Flow<Result>,
): Flow<Result> = flatMapConcat { status ->
    when (status) {
        NetworkStatus.Unavailable -> onUnavailable()
        NetworkStatus.Available -> onAvailable()
    }
}

@sralpert sorry for late response. I can't reproduce that, no issues when I try to implement it. best is to follow that StackOverflow link

I'll try to implement it again in a small project. If it recurs, I'll try to email to you. /steve

…

On 11/8/2022 5:17 AM, Marko Novakovic wrote: Re: marenovakovic/NetworkStatusTracker_full.kt ***@***.**** commented on this gist. -------------------------------------------------------------------------------- @sralpert <https://github.com/sralpert> sorry for late response. I can't reproduce that, no issues when I try to implement it. best is to follow that StackOverflow link — Reply to this email directly, view it on GitHub <https://gist.github.com/9466bfc1b765e06e1b3600efbc4da2f8#gistcomment-4362166> or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABNZPETSS44647C3HJLZYWTWHISDLBFKMF2HI4TJMJ2XIZLTSKBKK5TBNR2WLJDHNFZXJJDOMFWWLK3UNBZGKYLEL52HS4DFQKSXMYLMOVS2I5DSOVS2I3TBNVS3W5DIOJSWCZC7OBQXE5DJMNUXAYLOORPWCY3UNF3GS5DZVRZXKYTKMVRXIX3UPFYGLK2HNFZXIQ3PNVWWK3TUUZ2G64DJMNZZDAVEOR4XAZNEM5UXG5FFOZQWY5LFVEYTAOBXGM4DGNBUU52HE2LHM5SXFJTDOJSWC5DF>. You are receiving this email because you were mentioned. Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>.

-- Steve Alpert ***@***.***

@Drjacky sorry. Where did you put the line connectivityManager.requestNetwork(request, networkStatusCallback, 1000)? Thank you very much

@PatricioIN

...
    val request = NetworkRequest.Builder()
            .addCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET)
            .build()

        connectivityManager.registerNetworkCallback(request, callback)
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            connectivityManager.requestNetwork(request, callback, 1000) //THISSSS
        }

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

Can have checking connection in kotlin multiplatform instead of seperate android and ios?

@hafiz013 sure you can.
there are libraries like:
https://github.com/jordond/connectivity
and
https://github.com/ln-12/multiplatform-connectivity-status