feature: support filtering in Model Management screen

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

@@ -228,6 +228,8 @@ fun AppContent(
             val isMultiSelectionMode by modelsManagementViewModel.isMultiSelectionMode.collectAsState()
             val selectedModels by modelsManagementViewModel.selectedModels.collectAsState()
             val showSortMenu by modelsManagementViewModel.showSortMenu.collectAsState()
+            val activeFilters by modelsManagementViewModel.activeFilters.collectAsState()
+            val showFilterMenu by modelsManagementViewModel.showFilterMenu.collectAsState()
             val showImportModelMenu by modelsManagementViewModel.showImportModelMenu.collectAsState()
 
             // Create file launcher for importing local models
@@ -246,7 +248,12 @@ fun AppContent(
                     }
                 ),
                 filtering = BottomBarConfig.ModelsManagement.FilteringConfig(
-                    onClick = { /* TODO: implement filtering */ },
+                    isActive = activeFilters.any { it.value },
+                    filters = activeFilters,
+                    onToggleFilter = modelsManagementViewModel::toggleFilter,
+                    onClearFilters = modelsManagementViewModel::clearFilters,
+                    isMenuVisible = showFilterMenu,
+                    toggleMenu = modelsManagementViewModel::toggleFilterMenu
                 ),
                 selection = BottomBarConfig.ModelsManagement.SelectionConfig(
                     isActive = isMultiSelectionMode,

examples/llama.android/app/src/main/java/com/example/llama/revamp/ui/scaffold/BottomAppBars.kt

@@ -17,13 +17,13 @@ import androidx.compose.material.icons.filled.Check
 import androidx.compose.material.icons.filled.ClearAll
 import androidx.compose.material.icons.filled.Close
 import androidx.compose.material.icons.filled.Delete
-import androidx.compose.material.icons.filled.DeleteSweep
 import androidx.compose.material.icons.filled.FilterAlt
 import androidx.compose.material.icons.filled.FolderOpen
 import androidx.compose.material.icons.filled.PlayArrow
 import androidx.compose.material.icons.filled.Search
 import androidx.compose.material.icons.filled.SearchOff
 import androidx.compose.material.icons.filled.SelectAll
+import androidx.compose.material.icons.outlined.DeleteSweep
 import androidx.compose.material.icons.outlined.FilterAlt
 import androidx.compose.material3.BottomAppBar
 import androidx.compose.material3.Checkbox
@@ -101,7 +101,12 @@ sealed class BottomBarConfig {
         )
 
         data class FilteringConfig(
-            val onClick: () -> Unit
+            val isActive: Boolean,
+            val filters: Map<ModelFilter, Boolean>,
+            val onToggleFilter: (ModelFilter, Boolean) -> Unit,
+            val onClearFilters: () -> Unit,
+            val isMenuVisible: Boolean,
+            val toggleMenu: (Boolean) -> Unit
         )
 
         data class SelectionConfig(
@@ -271,20 +276,6 @@ fun ModelsManagementBottomBar(
         actions = {
             if (selection.isActive) {
                 /* Multi-selection mode actions */
-                IconButton(onClick = { selection.toggleAllSelection(true) }) {
-                    Icon(
-                        imageVector = Icons.Default.SelectAll,
-                        contentDescription = "Select all"
-                    )
-                }
-
-                IconButton(onClick = { selection.toggleAllSelection(false) }) {
-                    Icon(
-                        imageVector = Icons.Default.ClearAll,
-                        contentDescription = "Deselect all"
-                    )
-                }
-
                 IconButton(
                     onClick = selection.deleteSelected,
                     enabled = selection.selectedModels.isNotEmpty()
@@ -299,9 +290,30 @@ fun ModelsManagementBottomBar(
                     )
                 }
 
+                IconButton(onClick = { selection.toggleAllSelection(false) }) {
+                    Icon(
+                        imageVector = Icons.Default.ClearAll,
+                        contentDescription = "Deselect all"
+                    )
+                }
+
+                IconButton(onClick = { selection.toggleAllSelection(true) }) {
+                    Icon(
+                        imageVector = Icons.Default.SelectAll,
+                        contentDescription = "Select all"
+                    )
+                }
             } else {
                 /* Default mode actions */
 
+                // Multi-selection action
+                IconButton(onClick = { selection.toggleMode(true) }) {
+                    Icon(
+                        imageVector = Icons.Outlined.DeleteSweep,
+                        contentDescription = "Delete models"
+                    )
+                }
+
                 // Sorting action
                 IconButton(onClick = { sorting.toggleMenu(true) }) {
                     Icon(
@@ -339,20 +351,47 @@ fun ModelsManagementBottomBar(
                 }
 
                 // Filtering action
-                IconButton(
-                    onClick = filtering.onClick
-                ) {
+                IconButton(onClick = { filtering.toggleMenu(true) }) {
                     Icon(
-                        imageVector = Icons.Default.FilterAlt,
+                        imageVector =
+                            if (filtering.isActive) Icons.Default.FilterAlt
+                            else Icons.Outlined.FilterAlt,
                         contentDescription = "Filter models"
                     )
                 }
 
-                // Selection action
-                IconButton(onClick = { selection.toggleMode(true) }) {
-                    Icon(
-                        imageVector = Icons.Default.DeleteSweep,
-                        contentDescription = "Delete models"
+                // Filter dropdown menu
+                DropdownMenu(
+                    expanded = filtering.isMenuVisible,
+                    onDismissRequest = { filtering.toggleMenu(false) }
+                ) {
+                    Text(
+                        text = "Filter by",
+                        style = MaterialTheme.typography.labelMedium,
+                        modifier = Modifier.padding(horizontal = 16.dp, vertical = 8.dp)
+                    )
+
+                    filtering.filters.forEach { (filter, isEnabled) ->
+                        DropdownMenuItem(
+                            text = { Text(filter.displayName) },
+                            leadingIcon = {
+                                Checkbox(
+                                    checked = isEnabled,
+                                    onCheckedChange = null
+                                )
+                            },
+                            onClick = { filtering.onToggleFilter(filter, !isEnabled) }
+                        )
+                    }
+
+                    HorizontalDivider()
+
+                    DropdownMenuItem(
+                        text = { Text("Clear filters") },
+                        onClick = {
+                            filtering.onClearFilters()
+                            filtering.toggleMenu(false)
+                        }
                     )
                 }
             }

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

@@ -53,7 +53,7 @@ fun ModelsManagementScreen(
     viewModel: ModelsManagementViewModel,
 ) {
     // ViewModel states
-    val sortedModels by viewModel.sortedModels.collectAsState()
+    val filteredModels by viewModel.filteredModels.collectAsState()
     val managementState by viewModel.managementState.collectAsState()
 
     // Selection state from ViewModel
@@ -81,7 +81,7 @@ fun ModelsManagementScreen(
             modifier = Modifier.fillMaxSize().padding(horizontal = 16.dp),
             verticalArrangement = Arrangement.spacedBy(12.dp),
         ) {
-            items(items = sortedModels, key = { it.id }) { model ->
+            items(items = filteredModels, key = { it.id }) { model ->
                 val isSelected = if (isMultiSelectionMode) selectedModels.contains(model.id) else null
 
                 ModelCardFullExpandable(

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

@@ -63,7 +63,7 @@ class ModelSelectionViewModel @Inject constructor(
         _showSortMenu.value = visible
     }
 
-    // UI state: filters
+    // UI state: filter menu
     private val _activeFilters = MutableStateFlow<Map<ModelFilter, Boolean>>(
         ModelFilter.ALL_FILTERS.associateWith { false }
     )

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

@@ -5,8 +5,11 @@ import android.net.Uri
 import android.util.Log
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
+import com.example.llama.revamp.data.model.ModelFilter
 import com.example.llama.revamp.data.model.ModelInfo
 import com.example.llama.revamp.data.model.ModelSortOrder
+import com.example.llama.revamp.data.model.filterBy
+import com.example.llama.revamp.data.model.sortByOrder
 import com.example.llama.revamp.data.repository.InsufficientStorageException
 import com.example.llama.revamp.data.repository.ModelRepository
 import com.example.llama.revamp.util.getFileNameFromUri
@@ -17,15 +20,15 @@ import dagger.hilt.android.lifecycle.HiltViewModel
 import dagger.hilt.android.qualifiers.ApplicationContext
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.flow.MutableStateFlow
-import kotlinx.coroutines.flow.SharingStarted
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.collectLatest
 import kotlinx.coroutines.flow.combine
-import kotlinx.coroutines.flow.stateIn
 import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.launch
 import java.io.FileNotFoundException
 import javax.inject.Inject
+import kotlin.collections.set
 
 @HiltViewModel
 class ModelsManagementViewModel @Inject constructor(
@@ -33,16 +36,9 @@ class ModelsManagementViewModel @Inject constructor(
     private val modelRepository: ModelRepository
 ) : ViewModel() {
 
-    // Data: available models
-    private val _availableModels: StateFlow<List<ModelInfo>> = modelRepository.getModels()
-        .stateIn(
-            scope = viewModelScope,
-            started = SharingStarted.WhileSubscribed(SUBSCRIPTION_TIMEOUT_MS),
-            initialValue = emptyList()
-        )
-
-    private val _sortedModels = MutableStateFlow<List<ModelInfo>>(emptyList())
-    val sortedModels: StateFlow<List<ModelInfo>> = _sortedModels.asStateFlow()
+    // Data: models
+    private val _filteredModels = MutableStateFlow<List<ModelInfo>>(emptyList())
+    val filteredModels: StateFlow<List<ModelInfo>> = _filteredModels.asStateFlow()
 
     // UI state: multi-selection mode
     private val _isMultiSelectionMode = MutableStateFlow(false)
@@ -61,7 +57,7 @@ class ModelsManagementViewModel @Inject constructor(
 
     fun toggleModelSelectionById(modelId: String) {
         val current = _selectedModels.value.toMutableMap()
-        val model = _sortedModels.value.find { it.id == modelId }
+        val model = _filteredModels.value.find { it.id == modelId }
 
         if (model != null) {
             if (current.containsKey(modelId)) {
@@ -75,7 +71,7 @@ class ModelsManagementViewModel @Inject constructor(
 
     fun toggleAllSelection(selectAll: Boolean) {
         if (selectAll) {
-            _selectedModels.value = _sortedModels.value.associateBy { it.id }
+            _selectedModels.value = _filteredModels.value.associateBy { it.id }
         } else {
             _selectedModels.value = emptyMap()
         }
@@ -96,6 +92,33 @@ class ModelsManagementViewModel @Inject constructor(
         _showSortMenu.value = show
     }
 
+    // UI state: filters
+    private val _activeFilters = MutableStateFlow<Map<ModelFilter, Boolean>>(
+        ModelFilter.ALL_FILTERS.associateWith { false }
+    )
+    val activeFilters: StateFlow<Map<ModelFilter, Boolean>> = _activeFilters.asStateFlow()
+
+    fun toggleFilter(filter: ModelFilter, enabled: Boolean) {
+        _activeFilters.update { current ->
+            current.toMutableMap().apply {
+                this[filter] = enabled
+            }
+        }
+    }
+
+    fun clearFilters() {
+        _activeFilters.update { current ->
+            current.mapValues { false }
+        }
+    }
+
+    private val _showFilterMenu = MutableStateFlow(false)
+    val showFilterMenu: StateFlow<Boolean> = _showFilterMenu.asStateFlow()
+
+    fun toggleFilterMenu(visible: Boolean) {
+        _showFilterMenu.value = visible
+    }
+
     // UI state: import menu
     private val _showImportModelMenu = MutableStateFlow(false)
     val showImportModelMenu: StateFlow<Boolean> = _showImportModelMenu.asStateFlow()
@@ -106,18 +129,16 @@ class ModelsManagementViewModel @Inject constructor(
 
     init {
         viewModelScope.launch {
-            combine(_availableModels, _sortOrder, ::sortModels)
-                .collect { _sortedModels.value = it }
+            combine(
+                modelRepository.getModels(),
+                _activeFilters,
+                _sortOrder,
+            ) { models, filters, sortOrder ->
+                models.filterBy(filters).sortByOrder(sortOrder)
+            }.collectLatest {
+                _filteredModels.value = it
             }
         }
-
-    private fun sortModels(models: List<ModelInfo>, order: ModelSortOrder) =
-        when (order) {
-            ModelSortOrder.NAME_ASC -> models.sortedBy { it.name }
-            ModelSortOrder.NAME_DESC -> models.sortedByDescending { it.name }
-            ModelSortOrder.SIZE_ASC -> models.sortedBy { it.sizeInBytes }
-            ModelSortOrder.SIZE_DESC -> models.sortedByDescending { it.sizeInBytes }
-            ModelSortOrder.LAST_USED -> models.sortedByDescending { it.dateLastUsed ?: 0 }
     }
 
     // Internal state