feat: add notification for list content updates and manage preferences in SettingsScreen

CollabTableAndroid/app/src/main/java/com/collabtable/app/data/preferences/PreferencesManager.kt

@@ -42,6 +42,9 @@ class PreferencesManager(
     private val _notifyListRemoved = MutableStateFlow(isNotifyListRemovedEnabled())
     val notifyListRemoved: StateFlow<Boolean> = _notifyListRemoved.asStateFlow()
 
+    private val _notifyListContentUpdated = MutableStateFlow(isNotifyListContentUpdatedEnabled())
+    val notifyListContentUpdated: StateFlow<Boolean> = _notifyListContentUpdated.asStateFlow()
+
     fun getServerUrl(): String = prefs.getString(KEY_SERVER_URL, DEFAULT_SERVER_URL) ?: DEFAULT_SERVER_URL
 
     fun setServerUrl(url: String) {
@@ -169,6 +172,13 @@ class PreferencesManager(
         _notifyListRemoved.value = enabled
     }
 
+    private fun isNotifyListContentUpdatedEnabled(): Boolean = prefs.getBoolean(KEY_NOTIFY_LIST_CONTENT_UPDATED, true)
+
+    fun setNotifyListContentUpdatedEnabled(enabled: Boolean) {
+        prefs.edit().putBoolean(KEY_NOTIFY_LIST_CONTENT_UPDATED, enabled).apply()
+        _notifyListContentUpdated.value = enabled
+    }
+
     // Persist per-list column widths (fieldId -> widthDp)
     // Stored as a JSON object string in SharedPreferences under key: COLUMN_WIDTHS_PREFIX + listId
     fun getColumnWidths(listId: String): Map<String, Float> {
@@ -261,6 +271,7 @@ class PreferencesManager(
         private const val KEY_NOTIFY_LIST_ADDED = "notify_list_added"
         private const val KEY_NOTIFY_LIST_EDITED = "notify_list_edited"
         private const val KEY_NOTIFY_LIST_REMOVED = "notify_list_removed"
+    private const val KEY_NOTIFY_LIST_CONTENT_UPDATED = "notify_list_content_updated"
         private const val KEY_LAST_LIST_NOTIFY_CHECK_TS = "last_list_notify_check_ts"
         private const val COLUMN_WIDTHS_PREFIX = "column_widths_" // + listId
         private const val COLUMN_ALIGN_PREFIX = "column_align_" // + listId

CollabTableAndroid/app/src/main/java/com/collabtable/app/notifications/NotificationHelper.kt

@@ -57,6 +57,12 @@ object NotificationHelper {
         name: String,
     ) = showEvent(context, listId, "remove", "List removed", "\"$name\" was deleted")
 
+    fun showListContentUpdated(
+        context: Context,
+        listId: String,
+        name: String,
+    ) = showEvent(context, listId, "content", "List updated", "\"$name\" content changed")
+
     private fun showEvent(
         context: Context,
         listId: String,
@@ -102,6 +108,7 @@ object NotificationHelper {
                 "add" -> "Added • $text"
                 "edit" -> "Edited • $text"
                 "remove" -> "Removed • $text"
+                "content" -> "Updated • $text"
                 else -> text
             }
         synchronized(recentEventLines) {

CollabTableAndroid/app/src/main/java/com/collabtable/app/ui/screens/ListDetailScreen.kt

@@ -563,8 +563,8 @@ fun ListDetailScreen(
                                 }
                             }
 
-                            // Loading overlay during initial content load
-                            if (isLoading) {
+                            // Loading overlay only while nothing is available to render yet
+                            if (isLoading && stableFields.isEmpty() && stableItems.isEmpty()) {
                                 Box(
                                     modifier = Modifier.fillMaxSize(),
                                     contentAlignment = Alignment.Center,

CollabTableAndroid/app/src/main/java/com/collabtable/app/ui/screens/ListDetailViewModel.kt

@@ -3,6 +3,8 @@ package com.collabtable.app.ui.screens
 import android.content.Context
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.ProcessLifecycleOwner
 import androidx.room.withTransaction
 import com.collabtable.app.data.database.CollabTableDatabase
 import com.collabtable.app.data.model.CollabList
@@ -120,6 +122,19 @@ class ListDetailViewModel(
         syncRepository.performSync()
     }
 
+    private fun isInForeground(): Boolean {
+        val state = ProcessLifecycleOwner.get().lifecycle.currentState
+        return state.isAtLeast(Lifecycle.State.STARTED)
+    }
+
+    private fun maybeNotifyListContentUpdated() {
+        val prefs = com.collabtable.app.data.preferences.PreferencesManager.getInstance(context)
+        if (prefs.notifyListContentUpdated.value && !isInForeground()) {
+            val name = _list.value?.name ?: "Table"
+            com.collabtable.app.notifications.NotificationHelper.showListContentUpdated(context, listId, name)
+        }
+    }
+
     fun renameList(newName: String) {
         viewModelScope.launch {
             val currentList = _list.value
@@ -184,6 +199,7 @@ class ListDetailViewModel(
             }
 
             performSync()
+            maybeNotifyListContentUpdated()
         }
     }
 
@@ -197,6 +213,7 @@ class ListDetailViewModel(
                 }
             }
             performSync()
+            maybeNotifyListContentUpdated()
         }
     }
 
@@ -224,6 +241,7 @@ class ListDetailViewModel(
                     }
                 }
                 performSync()
+                maybeNotifyListContentUpdated()
             }
         }
     }
@@ -260,6 +278,7 @@ class ListDetailViewModel(
                 }
             }
             performSync()
+            maybeNotifyListContentUpdated()
         }
     }
 
@@ -295,6 +314,7 @@ class ListDetailViewModel(
                 }
             }
             performSync()
+            maybeNotifyListContentUpdated()
         }
     }
 
@@ -332,6 +352,7 @@ class ListDetailViewModel(
                 }
             }
             performSync()
+            maybeNotifyListContentUpdated()
         }
     }
 

CollabTableAndroid/app/src/main/java/com/collabtable/app/ui/screens/SettingsScreen.kt

@@ -84,6 +84,7 @@ fun SettingsScreen(
     val notifyListAdded by preferencesManager.notifyListAdded.collectAsState()
     val notifyListEdited by preferencesManager.notifyListEdited.collectAsState()
     val notifyListRemoved by preferencesManager.notifyListRemoved.collectAsState()
+    val notifyListContentUpdated by preferencesManager.notifyListContentUpdated.collectAsState()
     val displayUrl = remember(serverUrl) { formatServerUrlForDisplay(serverUrl) }
     var showLeaveDialog by remember { mutableStateOf(false) }
     var isLeaving by remember { mutableStateOf(false) }
@@ -379,6 +380,32 @@ fun SettingsScreen(
                             },
                         )
                     }
+                    Row(
+                        modifier = Modifier.fillMaxWidth(),
+                        horizontalArrangement = Arrangement.SpaceBetween,
+                        verticalAlignment = Alignment.CenterVertically,
+                    ) {
+                        Column(modifier = Modifier.weight(1f)) {
+                            Text("List content updated")
+                            Text(
+                                text = "Notify when fields or items change (add/edit/delete)",
+                                style = MaterialTheme.typography.labelSmall,
+                                color = MaterialTheme.colorScheme.onSurfaceVariant,
+                            )
+                        }
+                        Switch(
+                            checked = notifyListContentUpdated,
+                            onCheckedChange = { checked ->
+                                if (checked) {
+                                    ensureNotificationPermission {
+                                        preferencesManager.setNotifyListContentUpdatedEnabled(true)
+                                    }
+                                } else {
+                                    preferencesManager.setNotifyListContentUpdatedEnabled(false)
+                                }
+                            },
+                        )
+                    }
                     Row(
                         modifier = Modifier.fillMaxWidth(),
                         horizontalArrangement = Arrangement.SpaceBetween,

CollabTableAndroid/app/src/main/java/com/collabtable/app/work/ListChangeNotificationWorker.kt

@@ -50,8 +50,9 @@ class ListChangeNotificationWorker(
                 }
             }
             else -> {
-                if (prefs.notifyListEdited.value) {
-                    NotificationHelper.showListEdited(applicationContext, list.id, list.name)
+                // Background diff cannot distinguish rename vs content. Treat as content update here.
+                if (prefs.notifyListContentUpdated.value) {
+                    NotificationHelper.showListContentUpdated(applicationContext, list.id, list.name)
                 }
             }
         }