Moved coroutine usage in the ViewModels

app/build.gradle.kts

@@ -66,15 +66,15 @@ android {
 
 dependencies {
     // Import the Compose BOM
-    implementation(platform("androidx.compose:compose-bom:2024.11.00"))
+    implementation(platform("androidx.compose:compose-bom:2024.12.01"))
     implementation("androidx.activity:activity-compose:1.9.3")
     implementation("androidx.compose.material3:material3")
     implementation("androidx.compose.ui:ui")
     implementation("androidx.compose.ui:ui-tooling")
     implementation("androidx.compose.ui:ui-tooling-preview")
     implementation("androidx.lifecycle:lifecycle-runtime-ktx:2.8.7")
     implementation("androidx.lifecycle:lifecycle-viewmodel-compose:2.8.7")
-    implementation("androidx.navigation:navigation-compose:2.8.4")
+    implementation("androidx.navigation:navigation-compose:2.8.5")
 
     //Room
     implementation("androidx.room:room-runtime:${rootProject.extra["room_version"]}")

app/src/main/java/com/example/inventory/ui/item/ItemDetailsScreen.kt

@@ -48,7 +48,6 @@ import androidx.compose.runtime.Composable
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
-import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
@@ -64,7 +63,6 @@ import com.example.inventory.data.Item
 import com.example.inventory.ui.AppViewModelProvider
 import com.example.inventory.ui.navigation.NavigationDestination
 import com.example.inventory.ui.theme.InventoryTheme
-import kotlinx.coroutines.launch
 
 object ItemDetailsDestination : NavigationDestination {
     override val route = "item_details"
@@ -82,7 +80,6 @@ fun ItemDetailsScreen(
     viewModel: ItemDetailsViewModel = viewModel(factory = AppViewModelProvider.Factory)
 ) {
     val uiState = viewModel.uiState.collectAsState()
-    val coroutineScope = rememberCoroutineScope()
     Scaffold(
         topBar = {
             InventoryTopAppBar(
@@ -113,14 +110,8 @@ fun ItemDetailsScreen(
             itemDetailsUiState = uiState.value,
             onSellItem = { viewModel.reduceQuantityByOne() },
             onDelete = {
-                // Note: If the user rotates the screen very fast, the operation may get cancelled
-                // and the item may not be deleted from the Database. This is because when config
-                // change occurs, the Activity will be recreated and the rememberCoroutineScope will
-                // be cancelled - since the scope is bound to composition.
-                coroutineScope.launch {
                     viewModel.deleteItem()
                     navigateBack()
-                }
             },
             modifier = Modifier
                 .padding(

app/src/main/java/com/example/inventory/ui/item/ItemDetailsViewModel.kt

@@ -20,6 +20,7 @@ import androidx.lifecycle.SavedStateHandle
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import com.example.inventory.data.ItemsRepository
+import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.SharingStarted
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.filterNotNull
@@ -67,8 +68,10 @@ class ItemDetailsViewModel(
     /**
      * Deletes the item from the [ItemsRepository]'s data source.
      */
-    suspend fun deleteItem() {
-        itemsRepository.deleteItem(uiState.value.itemDetails.toItem())
+     fun deleteItem() {
+        viewModelScope.launch(Dispatchers.IO) {
+            itemsRepository.deleteItem(uiState.value.itemDetails.toItem())
+        }
     }
 
     companion object {

app/src/main/java/com/example/inventory/ui/item/ItemEditScreen.kt

@@ -24,7 +24,6 @@ import androidx.compose.foundation.verticalScroll
 import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.Scaffold
 import androidx.compose.runtime.Composable
-import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalLayoutDirection
 import androidx.compose.ui.res.stringResource
@@ -35,7 +34,6 @@ import com.example.inventory.R
 import com.example.inventory.ui.AppViewModelProvider
 import com.example.inventory.ui.navigation.NavigationDestination
 import com.example.inventory.ui.theme.InventoryTheme
-import kotlinx.coroutines.launch
 
 object ItemEditDestination : NavigationDestination {
     override val route = "item_edit"
@@ -52,7 +50,6 @@ fun ItemEditScreen(
     modifier: Modifier = Modifier,
     viewModel: ItemEditViewModel = viewModel(factory = AppViewModelProvider.Factory)
 ) {
-    val coroutineScope = rememberCoroutineScope()
     Scaffold(
         topBar = {
             InventoryTopAppBar(
@@ -67,14 +64,8 @@ fun ItemEditScreen(
             itemUiState = viewModel.itemUiState,
             onItemValueChange = viewModel::updateUiState,
             onSaveClick = {
-                // Note: If the user rotates the screen very fast, the operation may get cancelled
-                // and the item may not be updated in the Database. This is because when config
-                // change occurs, the Activity will be recreated and the rememberCoroutineScope will
-                // be cancelled - since the scope is bound to composition.
-                coroutineScope.launch {
                     viewModel.updateItem()
                     navigateBack()
-                }
             },
             modifier = Modifier
                 .padding(

app/src/main/java/com/example/inventory/ui/item/ItemEditViewModel.kt

@@ -23,6 +23,7 @@ import androidx.lifecycle.SavedStateHandle
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import com.example.inventory.data.ItemsRepository
+import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.filterNotNull
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.launch
@@ -55,9 +56,10 @@ class ItemEditViewModel(
     /**
      * Update the item in the [ItemsRepository]'s data source
      */
-    suspend fun updateItem() {
-        if (validateInput(itemUiState.itemDetails)) {
-            itemsRepository.updateItem(itemUiState.itemDetails.toItem())
+     fun updateItem() {
+        viewModelScope.launch(Dispatchers.IO) {
+            if (validateInput())
+                itemsRepository.updateItem(itemUiState.itemDetails.toItem())
         }
     }
 

app/src/main/java/com/example/inventory/ui/item/ItemEntryScreen.kt

@@ -33,7 +33,6 @@ import androidx.compose.material3.OutlinedTextFieldDefaults
 import androidx.compose.material3.Scaffold
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
-import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalLayoutDirection
 import androidx.compose.ui.res.dimensionResource
@@ -46,7 +45,6 @@ import com.example.inventory.R
 import com.example.inventory.ui.AppViewModelProvider
 import com.example.inventory.ui.navigation.NavigationDestination
 import com.example.inventory.ui.theme.InventoryTheme
-import kotlinx.coroutines.launch
 import java.util.Currency
 import java.util.Locale
 
@@ -63,7 +61,6 @@ fun ItemEntryScreen(
     canNavigateBack: Boolean = true,
     viewModel: ItemEntryViewModel = viewModel(factory = AppViewModelProvider.Factory)
 ) {
-    val coroutineScope = rememberCoroutineScope()
     Scaffold(
         topBar = {
             InventoryTopAppBar(
@@ -77,14 +74,8 @@ fun ItemEntryScreen(
             itemUiState = viewModel.itemUiState,
             onItemValueChange = viewModel::updateUiState,
             onSaveClick = {
-                // Note: If the user rotates the screen very fast, the operation may get cancelled
-                // and the item may not be saved in the Database. This is because when config
-                // change occurs, the Activity will be recreated and the rememberCoroutineScope will
-                // be cancelled - since the scope is bound to composition.
-                coroutineScope.launch {
                     viewModel.saveItem()
                     navigateBack()
-                }
             },
             modifier = Modifier
                 .padding(

app/src/main/java/com/example/inventory/ui/item/ItemEntryViewModel.kt

@@ -20,8 +20,11 @@ import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.setValue
 import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
 import com.example.inventory.data.Item
 import com.example.inventory.data.ItemsRepository
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
 import java.text.NumberFormat
 
 /**
@@ -47,9 +50,10 @@ class ItemEntryViewModel(private val itemsRepository: ItemsRepository) : ViewMod
     /**
      * Inserts an [Item] in the Room database
      */
-    suspend fun saveItem() {
-        if (validateInput()) {
-            itemsRepository.insertItem(itemUiState.itemDetails.toItem())
+     fun saveItem() {
+        viewModelScope.launch(Dispatchers.IO) {
+            if (validateInput())
+                itemsRepository.insertItem(itemUiState.itemDetails.toItem())
         }
     }
 

build.gradle.kts

@@ -22,12 +22,12 @@ buildscript {
 }
 
 plugins {
-    id("com.android.application") version "8.1.4" apply false
-    id("com.android.library") version "8.1.4" apply false
+    id("com.android.application") version "8.7.3" apply false
+    id("com.android.library") version "8.7.3" apply false
     id("org.jetbrains.kotlin.android") version "2.1.0" apply false
     id("org.jetbrains.kotlin.plugin.compose") version "2.1.0" apply false
 }
 
 tasks.register("clean", Delete::class) {
-    delete(rootProject.buildDir)
+    delete(rootProject.layout.buildDirectory)
 }