DI: replace manual DI with Hilt DI

examples/llama.android/app/src/main/java/com/example/llama/revamp/MainActivity.kt

@@ -22,13 +22,12 @@ import androidx.compose.runtime.remember
 import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
+import androidx.hilt.navigation.compose.hiltViewModel
 import androidx.lifecycle.compose.LocalLifecycleOwner
-import androidx.lifecycle.viewmodel.compose.viewModel
 import androidx.navigation.compose.NavHost
 import androidx.navigation.compose.composable
 import androidx.navigation.compose.currentBackStackEntryAsState
 import androidx.navigation.compose.rememberNavController
-import com.example.llama.revamp.engine.InferenceEngine
 import com.example.llama.revamp.navigation.AppDestinations
 import com.example.llama.revamp.navigation.NavigationActions
 import com.example.llama.revamp.ui.components.AppNavigationDrawer
@@ -40,11 +39,12 @@ import com.example.llama.revamp.ui.screens.ModelsManagementScreen
 import com.example.llama.revamp.ui.screens.ModelLoadingScreen
 import com.example.llama.revamp.ui.screens.SettingsGeneralScreen
 import com.example.llama.revamp.ui.theme.LlamaTheme
-import com.example.llama.revamp.util.ViewModelFactoryProvider
 import com.example.llama.revamp.viewmodel.MainViewModel
+import dagger.hilt.android.AndroidEntryPoint
 import kotlinx.coroutines.isActive
 import kotlinx.coroutines.launch
 
+@AndroidEntryPoint
 class MainActivity : ComponentActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -62,26 +62,19 @@ class MainActivity : ComponentActivity() {
 }
 
 @Composable
-fun AppContent() {
-    val navController = rememberNavController()
-    val drawerState = rememberDrawerState(initialValue = DrawerValue.Closed)
+fun AppContent(
+    mainVewModel: MainViewModel = hiltViewModel()
+) {
     val coroutineScope = rememberCoroutineScope()
 
-    // Create inference engine
-    val inferenceEngine = remember { InferenceEngine() }
+    val navController = rememberNavController()
+    val navigationActions = remember(navController) { NavigationActions(navController) }
+    val drawerState = rememberDrawerState(initialValue = DrawerValue.Closed)
 
-    // Create factory for MainViewModel
-    val factory = remember { ViewModelFactoryProvider.getMainViewModelFactory(inferenceEngine) }
+    val engineState by mainVewModel.engineState.collectAsState()
+    // TODO-han.yin: Also use delegate for `isModelLoaded`:
+    val isModelLoaded = remember(engineState) { mainVewModel.isModelLoaded() }
 
-    // Get ViewModel instance with factory
-    val viewModel: MainViewModel = viewModel(factory = factory)
-
-    val engineState by viewModel.engineState.collectAsState()
-    val isModelLoaded = remember(engineState) { viewModel.isModelLoaded() }
-
-    val navigationActions = remember(navController) {
-        NavigationActions(navController)
-    }
 
     // Model unloading confirmation
     var showUnloadDialog by remember { mutableStateOf(false) }
@@ -123,10 +116,10 @@ fun AppContent() {
 
     // Helper function to handle back press with model unloading check
     val handleBackWithModelCheck = {
-        if (viewModel.isModelLoading()) {
+        if (mainVewModel.isModelLoading()) {
             // If model is still loading, ignore the request
             true // Mark as handled
-        } else if (viewModel.isModelLoaded()) {
+        } else if (mainVewModel.isModelLoaded()) {
             showUnloadDialog = true
             pendingNavigation = { navController.popBackStack() }
             true // Mark as handled
@@ -194,7 +187,7 @@ fun AppContent() {
             composable(AppDestinations.MODEL_SELECTION_ROUTE) {
                 ModelSelectionScreen(
                     onModelSelected = { modelInfo ->
-                        viewModel.selectModel(modelInfo)
+                        mainVewModel.selectModel(modelInfo)
                         navigationActions.navigateToModelLoading()
                     },
                     onManageModelsClicked = {
@@ -211,13 +204,13 @@ fun AppContent() {
                 ModelLoadingScreen(
                     engineState = engineState,
                     onBenchmarkSelected = {
-                        viewModel.prepareForBenchmark()
+                        mainVewModel.prepareForBenchmark()
                         navigationActions.navigateToBenchmark()
                     },
                     onConversationSelected = { systemPrompt ->
                         // Store a reference to the loading job
                         val loadingJob = coroutineScope.launch {
-                            viewModel.prepareForConversation(systemPrompt)
+                            mainVewModel.prepareForConversation(systemPrompt)
                             // Check if the job wasn't cancelled before navigating
                             if (isActive) {
                                 navigationActions.navigateToConversation()
@@ -245,7 +238,7 @@ fun AppContent() {
                         // Need to unload model before going back
                         handleBackWithModelCheck()
                     },
-                    viewModel = viewModel
+                    viewModel = mainVewModel
                 )
             }
 
@@ -257,14 +250,14 @@ fun AppContent() {
                         handleBackWithModelCheck()
                     },
                     onRerunPressed = {
-                        viewModel.rerunBenchmark()
+                        mainVewModel.rerunBenchmark()
                     },
                     onSharePressed = {
                         // Stub for sharing functionality
                     },
                     drawerState = drawerState,
                     navigationActions = navigationActions,
-                    viewModel = viewModel
+                    viewModel = mainVewModel
                 )
             }
 
@@ -295,7 +288,7 @@ fun AppContent() {
             onConfirm = {
                 isUnloading = true
                 coroutineScope.launch {
-                    viewModel.unloadModel()
+                    mainVewModel.unloadModel()
                     isUnloading = false
                     showUnloadDialog = false
                     pendingNavigation?.invoke()

examples/llama.android/app/src/main/java/com/example/llama/revamp/ui/components/AppScaffolds.kt

@@ -8,11 +8,7 @@ import androidx.compose.runtime.Composable
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.remember
-import androidx.compose.ui.platform.LocalContext
-import androidx.lifecycle.viewmodel.compose.viewModel
-import com.example.llama.revamp.data.preferences.UserPreferences
-import com.example.llama.revamp.monitoring.PerformanceMonitor
-import com.example.llama.revamp.util.ViewModelFactoryProvider
+import androidx.hilt.navigation.compose.hiltViewModel
 import com.example.llama.revamp.viewmodel.PerformanceViewModel
 
 // DefaultAppScaffold.kt
@@ -42,6 +38,7 @@ fun DefaultAppScaffold(
 // PerformanceAppScaffold.kt
 @Composable
 fun PerformanceAppScaffold(
+    performanceViewModel: PerformanceViewModel = hiltViewModel(),
     title: String,
     onNavigateBack: (() -> Unit)? = null,
     onMenuOpen: (() -> Unit)? = null,
@@ -49,17 +46,6 @@ fun PerformanceAppScaffold(
     snackbarHostState: SnackbarHostState = remember { SnackbarHostState() },
     content: @Composable (PaddingValues) -> Unit
 ) {
-    // Create dependencies for PerformanceViewModel
-    val context = LocalContext.current
-    val performanceMonitor = remember { PerformanceMonitor(context) }
-    val userPreferences = remember { UserPreferences(context) }
-
-    // Create factory for PerformanceViewModel
-    val factory = remember { ViewModelFactoryProvider.getPerformanceViewModelFactory(performanceMonitor, userPreferences) }
-
-    // Get ViewModel instance with factory
-    val performanceViewModel: PerformanceViewModel = viewModel(factory = factory)
-
     // Collect performance metrics
     val memoryUsage by performanceViewModel.memoryUsage.collectAsState()
     val temperatureInfo by performanceViewModel.temperatureMetrics.collectAsState()

examples/llama.android/app/src/main/java/com/example/llama/revamp/ui/screens/BenchmarkScreen.kt

@@ -22,7 +22,7 @@ import androidx.compose.runtime.getValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.unit.dp
-import androidx.lifecycle.viewmodel.compose.viewModel
+import androidx.hilt.navigation.compose.hiltViewModel
 import com.example.llama.revamp.engine.InferenceEngine
 import com.example.llama.revamp.navigation.NavigationActions
 import com.example.llama.revamp.ui.components.PerformanceAppScaffold
@@ -36,7 +36,7 @@ fun BenchmarkScreen(
     onSharePressed: () -> Unit,
     drawerState: DrawerState,
     navigationActions: NavigationActions,
-    viewModel: MainViewModel = viewModel()
+    viewModel: MainViewModel = hiltViewModel()
 ) {
     val engineState by viewModel.engineState.collectAsState()
     val benchmarkResults by viewModel.benchmarkResults.collectAsState()

examples/llama.android/app/src/main/java/com/example/llama/revamp/ui/screens/ConversationScreen.kt

@@ -57,6 +57,7 @@ import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.StrokeCap
 import androidx.compose.ui.platform.LocalLifecycleOwner
 import androidx.compose.ui.unit.dp
+import androidx.hilt.navigation.compose.hiltViewModel
 import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.LifecycleEventObserver
 import com.example.llama.revamp.engine.InferenceEngine
@@ -71,7 +72,7 @@ import kotlinx.coroutines.launch
 @Composable
 fun ConversationScreen(
     onBackPressed: () -> Unit,
-    viewModel: MainViewModel
+    viewModel: MainViewModel = hiltViewModel()
 ) {
     val engineState by viewModel.engineState.collectAsState()
     val messages by viewModel.messages.collectAsState()

examples/llama.android/app/src/main/java/com/example/llama/revamp/ui/screens/ModelLoadingScreen.kt

@@ -44,17 +44,14 @@ import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
-import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.semantics.Role
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
-import androidx.lifecycle.viewmodel.compose.viewModel
+import androidx.hilt.navigation.compose.hiltViewModel
 import com.example.llama.revamp.data.model.SystemPrompt
-import com.example.llama.revamp.data.repository.SystemPromptRepository
 import com.example.llama.revamp.engine.InferenceEngine
 import com.example.llama.revamp.navigation.NavigationActions
 import com.example.llama.revamp.ui.components.PerformanceAppScaffold
-import com.example.llama.revamp.util.ViewModelFactoryProvider
 import com.example.llama.revamp.viewmodel.SystemPromptViewModel
 
 enum class SystemPromptTab {
@@ -64,6 +61,7 @@ enum class SystemPromptTab {
 @OptIn(ExperimentalMaterial3Api::class, ExperimentalFoundationApi::class)
 @Composable
 fun ModelLoadingScreen(
+    viewModel: SystemPromptViewModel = hiltViewModel(),
     engineState: InferenceEngine.State,
     onBenchmarkSelected: () -> Unit,
     onConversationSelected: (String?) -> Unit,
@@ -71,12 +69,6 @@ fun ModelLoadingScreen(
     drawerState: DrawerState,
     navigationActions: NavigationActions
 ) {
-    // Set up SystemPromptViewModel
-    val context = LocalContext.current
-    val repository = remember { SystemPromptRepository(context) }
-    val factory = remember { ViewModelFactoryProvider.getSystemPromptViewModelFactory(repository) }
-    val viewModel: SystemPromptViewModel = viewModel(factory = factory)
-
     val presetPrompts by viewModel.presetPrompts.collectAsState()
     val recentPrompts by viewModel.recentPrompts.collectAsState()
 

examples/llama.android/app/src/main/java/com/example/llama/revamp/ui/screens/ModelsManagementScreen.kt

@@ -10,11 +10,7 @@ import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.items
 import androidx.compose.material.icons.Icons
-import androidx.compose.material.icons.filled.CloudDownload
 import androidx.compose.material.icons.filled.Delete
-import androidx.compose.material.icons.filled.Done
-import androidx.compose.material.icons.filled.Edit
-import androidx.compose.material.icons.filled.FileOpen
 import androidx.compose.material.icons.filled.Info
 import androidx.compose.material3.Card
 import androidx.compose.material3.CardDefaults

examples/llama.android/app/src/main/java/com/example/llama/revamp/ui/screens/SettingsGeneralScreen.kt

@@ -18,17 +18,12 @@ import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
-import androidx.compose.runtime.remember
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
-import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.unit.dp
-import androidx.lifecycle.viewmodel.compose.viewModel
-import com.example.llama.revamp.data.preferences.UserPreferences
-import com.example.llama.revamp.monitoring.PerformanceMonitor
+import androidx.hilt.navigation.compose.hiltViewModel
 import com.example.llama.revamp.navigation.NavigationActions
 import com.example.llama.revamp.ui.components.DefaultAppScaffold
-import com.example.llama.revamp.util.ViewModelFactoryProvider
 import com.example.llama.revamp.viewmodel.PerformanceViewModel
 
 /**
@@ -36,22 +31,12 @@ import com.example.llama.revamp.viewmodel.PerformanceViewModel
  */
 @Composable
 fun SettingsGeneralScreen(
+    performanceViewModel: PerformanceViewModel = hiltViewModel(),
     onBackPressed: () -> Unit,
     drawerState: DrawerState,
     navigationActions: NavigationActions,
     onMenuClicked: () -> Unit
 ) {
-    // Create dependencies for PerformanceViewModel
-    val context = LocalContext.current
-    val performanceMonitor = remember { PerformanceMonitor(context) }
-    val userPreferences = remember { UserPreferences(context) }
-
-    // Create factory for PerformanceViewModel
-    val factory = remember { ViewModelFactoryProvider.getPerformanceViewModelFactory(performanceMonitor, userPreferences) }
-
-    // Get ViewModel instance with factory
-    val performanceViewModel: PerformanceViewModel = viewModel(factory = factory)
-
     // Collect state from ViewModel
     val isMonitoringEnabled by performanceViewModel.isMonitoringEnabled.collectAsState()
     val useFahrenheit by performanceViewModel.useFahrenheitUnit.collectAsState()

examples/llama.android/app/src/main/java/com/example/llama/revamp/util/ViewModelFactoryProvider.kt

@@ -1,69 +0,0 @@
-package com.example.llama.revamp.util
-
-import androidx.lifecycle.ViewModel
-import androidx.lifecycle.ViewModelProvider
-import com.example.llama.revamp.data.preferences.UserPreferences
-import com.example.llama.revamp.data.repository.SystemPromptRepository
-import com.example.llama.revamp.engine.InferenceEngine
-import com.example.llama.revamp.monitoring.PerformanceMonitor
-import com.example.llama.revamp.viewmodel.MainViewModel
-import com.example.llama.revamp.viewmodel.PerformanceViewModel
-import com.example.llama.revamp.viewmodel.SystemPromptViewModel
-
-/**
- * Utility class to provide ViewModel factories.
- */
-object ViewModelFactoryProvider {
-
-    /**
-     * Creates a factory for PerformanceViewModel.
-     */
-    fun getPerformanceViewModelFactory(
-        performanceMonitor: PerformanceMonitor,
-        userPreferences: UserPreferences
-    ): ViewModelProvider.Factory {
-        return object : ViewModelProvider.Factory {
-            @Suppress("UNCHECKED_CAST")
-            override fun <T : ViewModel> create(modelClass: Class<T>): T {
-                if (modelClass.isAssignableFrom(PerformanceViewModel::class.java)) {
-                    return PerformanceViewModel(performanceMonitor, userPreferences) as T
-                }
-                throw IllegalArgumentException("Unknown ViewModel class: ${modelClass.name}")
-            }
-        }
-    }
-
-    /**
-     * Creates a factory for MainViewModel.
-     */
-    fun getMainViewModelFactory(
-        inferenceEngine: InferenceEngine
-    ): ViewModelProvider.Factory {
-        return object : ViewModelProvider.Factory {
-            @Suppress("UNCHECKED_CAST")
-            override fun <T : ViewModel> create(modelClass: Class<T>): T {
-                if (modelClass.isAssignableFrom(MainViewModel::class.java)) {
-                    return MainViewModel(inferenceEngine) as T
-                }
-                throw IllegalArgumentException("Unknown ViewModel class: ${modelClass.name}")
-            }
-        }
-    }
-
-    /**
-     * Creates a factory for SystemPromptViewModel.
-     */
-    fun getSystemPromptViewModelFactory(
-        repository: SystemPromptRepository
-    ): ViewModelProvider.Factory {
-        return object : ViewModelProvider.Factory {
-            @Suppress("UNCHECKED_CAST")
-            override fun <T : ViewModel> create(modelClass: Class<T>): T {
-                if (modelClass.isAssignableFrom(SystemPromptViewModel::class.java)) {
-                    return SystemPromptViewModel(repository) as T
-                }
-                throw IllegalArgumentException("Unknown ViewModel class: ${modelClass.name}")
-            }
-        }
-    }
-}