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mvvm: move network node actions to NetworkScreenViewModel #46

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44 changes: 32 additions & 12 deletions app/src/main/java/com/greybox/projectmesh/viewModel/NetworkScreenViewModel.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -32,8 +32,10 @@ data class NetworkScreenModel(
class NetworkScreenViewModel(di:DI, savedStateHandle: SavedStateHandle): ViewModel() {
// _uiState will be updated whenever there is a change in the UI state
private val _uiState = MutableStateFlow(NetworkScreenModel())

// uiState is a read-only property that shows the current UI state
val uiState: Flow<NetworkScreenModel> = _uiState.asStateFlow()

// di is used to get the AndroidVirtualNode instance
private val node: AndroidVirtualNode by di.instance()
private val appServer: AppServer by di.instance()
Expand All @@ -54,7 +56,8 @@ class NetworkScreenViewModel(di:DI, savedStateHandle: SavedStateHandle): ViewMod

// For each disconnected node, notify DeviceStatusManager
disconnectedNodes.forEach { nodeAddress ->
val ipAddress = InetAddress.getByAddress(nodeAddress.addressToByteArray()).hostAddress
val ipAddress =
InetAddress.getByAddress(nodeAddress.addressToByteArray()).hostAddress
DeviceStatusManager.handleNetworkDisconnect(ipAddress)
Log.d("NetworkScreenViewModel", "Detected disconnection of node: $ipAddress")
}
Expand All @@ -77,11 +80,11 @@ class NetworkScreenViewModel(di:DI, savedStateHandle: SavedStateHandle): ViewMod
allNodes = allNodesWithTest,
// update the ssid of the connecting station
connectingInProgressSsid =
if (nodeState.wifiState.wifiStationState.status == WifiStationState.Status.CONNECTING) {
nodeState.wifiState.wifiStationState.config?.ssid
} else {
null
}
if (nodeState.wifiState.wifiStationState.status == WifiStationState.Status.CONNECTING) {
nodeState.wifiState.wifiStationState.config?.ssid
} else {
null
}
)
}

Expand Down Expand Up @@ -187,13 +190,30 @@ class NetworkScreenViewModel(di:DI, savedStateHandle: SavedStateHandle): ViewMod
delay(30000)
}
}
}

*/
fun getDeviceName(wifiAddress: Int) {
viewModelScope.launch {
val inetAddress = InetAddress.getByAddress(wifiAddress.addressToByteArray())
appServer.sendDeviceName(inetAddress)
}

fun onNodeSelected(ipAddress: String) {
viewModelScope.launch {
try {
val addr = InetAddress.getByName(ipAddress)
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@gemini-code-assist gemini-code-assist bot Mar 5, 2026

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high

InetAddress.getByName(ipAddress) is a blocking network call. Since viewModelScope.launch defaults to the main dispatcher, this could lead to a NetworkOnMainThreadException and cause your app to crash. You should perform this operation on a background thread using withContext(Dispatchers.IO).

You will also need to add import kotlinx.coroutines.Dispatchers and import kotlinx.coroutines.withContext at the top of the file.

Suggested change
val addr = InetAddress.getByName(ipAddress)
val addr = withContext(Dispatchers.IO) { InetAddress.getByName(ipAddress) }

appServer.requestRemoteUserInfo(addr)
appServer.pushUserInfoTo(addr)
} catch (e: Exception) {
Log.e("NetworkScreenViewModel", "Failed to request user info for $ipAddress", e)
}
}
}
}

fun getDeviceName(wifiAddress: Int) {
viewModelScope.launch {
val inetAddress = InetAddress.getByAddress(wifiAddress.addressToByteArray())
appServer.sendDeviceName(inetAddress)
}
}
}




15 changes: 3 additions & 12 deletions app/src/main/java/com/greybox/projectmesh/views/NetworkScreen.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -9,14 +9,11 @@ import androidx.compose.runtime.getValue
import androidx.compose.ui.platform.LocalSavedStateRegistryOwner
import androidx.lifecycle.viewmodel.compose.viewModel
import com.greybox.projectmesh.ViewModelFactory
import com.greybox.projectmesh.viewModel.HomeScreenViewModel
import com.greybox.projectmesh.viewModel.NetworkScreenModel
import com.greybox.projectmesh.viewModel.NetworkScreenViewModel
import org.kodein.di.compose.localDI
import com.greybox.projectmesh.extension.WifiListItem
import com.greybox.projectmesh.server.AppServer
import java.net.InetAddress
import org.kodein.di.instance


@Composable
fun NetworkScreen(
Expand All @@ -30,8 +27,7 @@ fun NetworkScreen(
) {
// declare the UI state, we can use the uiState to access the current state of the viewModel
val uiState: NetworkScreenModel by viewModel.uiState.collectAsState(initial = NetworkScreenModel())
val di = localDI()
val appServer: AppServer by di.instance()


// display all the connected station
LazyColumn{
Expand All @@ -43,12 +39,7 @@ fun NetworkScreen(
wifiAddress = eachItem.key,
wifiEntry = eachItem.value,
onClick = { ipAddress ->
//request user info when clicking
val addr = InetAddress.getByName(ipAddress)
appServer.requestRemoteUserInfo(addr)
appServer.pushUserInfoTo(addr)

//Navigate to Ping Screen
viewModel.onNodeSelected(ipAddress)
onNodeClick(ipAddress)
}
)
Expand Down