This commit introduces a new setting in the General Settings screen that allows users to enable or disable haptic feedback (vibration) when a new measurement is received and refactored BleConnector to use MeasurementFacade for saving measurements.

android_app/app/src/main/AndroidManifest.xml

@@ -6,6 +6,7 @@
     <uses-permission android:name="android.permission.BLUETOOTH_SCAN" android:usesPermissionFlags="neverForLocation" />
     <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
     <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
+    <uses-permission android:name="android.permission.VIBRATE" />
 
     <permission
         android:name="${applicationId}.READ_WRITE_DATA"

android_app/app/src/main/java/com/health/openscale/core/facade/BluetoothFacade.kt

@@ -59,7 +59,8 @@ import com.health.openscale.ui.shared.SnackbarEvent
 class BluetoothFacade @Inject constructor(
     private val application: Application,
     private val scaleFactory: ScaleFactory,
-    private val databaseRepository: DatabaseRepository,
+    private val measurementFacade: MeasurementFacade,
+    private val userFacade: UserFacade,
     private val settingsFacade: SettingsFacade,
 ) {
     private val TAG = "BluetoothFacade"
@@ -71,7 +72,7 @@ class BluetoothFacade @Inject constructor(
     private val connection = BleConnector(
         scope = scope,
         scaleFactory = scaleFactory,
-        databaseRepository = databaseRepository,
+        measurementFacade = measurementFacade,
         getCurrentScaleUser = { currentBtScaleUser.value }
     )
 
@@ -108,10 +109,7 @@ class BluetoothFacade @Inject constructor(
 
     private fun observeCurrentUser() {
         scope.launch {
-            settingsFacade.currentUserId
+            userFacade.observeSelectedUser()
-                .flatMapLatest { id ->
-                    if (id == null) flowOf(null) else databaseRepository.getUserById(id)
-                }
                 .collect { user ->
                     currentAppUser.value = user
                     currentBtScaleUser.value = user?.let { toScaleUser(it) }

android_app/app/src/main/java/com/health/openscale/core/facade/SettingsFacade.kt

@@ -60,6 +60,8 @@ object SettingsPreferenceKeys {
     val CURRENT_USER_ID = intPreferencesKey("current_user_id")
     val APP_LANGUAGE_CODE = stringPreferencesKey("app_language_code")
 
+    val HAPTIC_ON_MEASUREMENT = booleanPreferencesKey("haptic_on_measurement")
+
     // Settings for specific UI components
     val SELECTED_TYPES_TABLE = stringSetPreferencesKey("selected_types_table") // IDs of measurement types selected for the data table
 
@@ -129,6 +131,9 @@ interface SettingsFacade {
     val appLanguageCode: Flow<String?>
     suspend fun setAppLanguageCode(languageCode: String?)
 
+    val hapticOnMeasurement: Flow<Boolean>
+    suspend fun setHapticOnMeasurement(value: Boolean)
+
     val currentUserId: Flow<Int?>
     suspend fun setCurrentUserId(userId: Int?)
 
@@ -260,6 +265,19 @@ class SettingsFacadeImpl @Inject constructor(
         }
     }
 
+    override val hapticOnMeasurement: Flow<Boolean> = observeSetting(
+        SettingsPreferenceKeys.HAPTIC_ON_MEASUREMENT.name,
+        false
+    ).catch { exception ->
+        LogManager.e(TAG, "Error observing hapticOnMeasurement", exception)
+        emit(false)
+    }
+
+    override suspend fun setHapticOnMeasurement(value: Boolean) {
+        LogManager.d(TAG, "Setting hapticOnMeasurement to: $value")
+        saveSetting(SettingsPreferenceKeys.HAPTIC_ON_MEASUREMENT.name, value)
+    }
+
     override val currentUserId: Flow<Int?> = dataStore.data
         .catch { exception ->
             LogManager.e(TAG, "Error reading currentUserId from DataStore.", exception)

android_app/app/src/main/java/com/health/openscale/core/service/BleConnector.kt

@@ -30,6 +30,7 @@ import com.health.openscale.core.data.Measurement
 import com.health.openscale.core.data.MeasurementTypeKey
 import com.health.openscale.core.data.MeasurementValue
 import com.health.openscale.core.database.DatabaseRepository
+import com.health.openscale.core.facade.MeasurementFacade
 import com.health.openscale.core.utils.LogManager
 import com.health.openscale.ui.shared.SnackbarEvent
 import kotlinx.coroutines.CoroutineScope
@@ -61,14 +62,11 @@ import java.util.concurrent.atomic.AtomicInteger
  * @param databaseRepository Repository for saving received measurements.
  * @param sharedViewModel ViewModel for showing snackbars and potentially other UI interactions.
  * @param getCurrentScaleUser Callback function to retrieve the current Bluetooth scale user.
- * @param getCurrentAppUserId Callback function to retrieve the ID of the current application user.
- * @param onUserSelectionRequired Callback to notify the UI when user interaction on the device is needed.
- * @param onSavePreferredDevice Callback to save the successfully connected device as preferred.
  */
 class BleConnector(
     private val scope: CoroutineScope,
     private val scaleFactory: ScaleFactory,
-    private val databaseRepository: DatabaseRepository,
+    private val measurementFacade: MeasurementFacade,
     private val getCurrentScaleUser: () -> ScaleUser?,
     ) : AutoCloseable {
 
@@ -373,7 +371,7 @@ class BleConnector(
 
             // Fetch measurement type IDs from the database to map keys to foreign keys.
             val typeKeyToIdMap: Map<MeasurementTypeKey, Int> =
-                databaseRepository.getAllMeasurementTypes().firstOrNull()
+                measurementFacade.getAllMeasurementTypes().firstOrNull()
                     ?.associate { it.key to it.id } ?: run {
                     LogManager.e(TAG, "Could not load MeasurementTypes from DB for $deviceName.")
                     _snackbarEvents.tryEmit(SnackbarEvent(messageResId = R.string.bluetooth_connector_measurement_types_not_loaded))
@@ -457,11 +455,9 @@ class BleConnector(
             }
 
             try {
-                val measurementId = databaseRepository.insertMeasurement(newDbMeasurement)
+                val measurementId = measurementFacade.saveMeasurement(newDbMeasurement, values)
-                val finalValues = values.map { it.copy(measurementId = measurementId.toInt()) }
-                finalValues.forEach { databaseRepository.insertMeasurementValue(it) }
 
-                LogManager.i(TAG, "Measurement from $deviceName for User $currentAppUserId saved (ID: $measurementId). Values: ${finalValues.size}")
+                LogManager.i(TAG, "Measurement from $deviceName for User $currentAppUserId saved (ID: $measurementId). Values: ${values.size}")
                 pendingSavedCount.incrementAndGet()
                 lastSavedArgs = listOf(measurementData.weight, deviceName)
                 savedBurstSignal.tryEmit(Unit)

android_app/app/src/main/java/com/health/openscale/core/usecase/MeasurementCrudUseCases.kt

@@ -18,9 +18,13 @@
 package com.health.openscale.core.usecase
 
 import android.content.Context
+import android.os.VibrationEffect
+import android.os.Vibrator
+import android.os.VibratorManager
 import com.health.openscale.core.data.Measurement
 import com.health.openscale.core.data.MeasurementValue
 import com.health.openscale.core.database.DatabaseRepository
+import com.health.openscale.core.facade.SettingsFacade
 import com.health.openscale.ui.widget.MeasurementWidget
 import dagger.hilt.android.qualifiers.ApplicationContext
 import kotlinx.coroutines.Dispatchers
@@ -41,8 +45,10 @@ import javax.inject.Singleton
 class MeasurementCrudUseCases @Inject constructor(
     @ApplicationContext private val appContext: Context,
     private val databaseRepository: DatabaseRepository,
-    private val sync: SyncUseCases
+    private val sync: SyncUseCases,
+    private val settingsFacade: SettingsFacade
 ) {
+    private var lastVibrateTime = 0L
 
     /**
      * Inserts or updates a [measurement] and reconciles its [values].
@@ -74,6 +80,8 @@ class MeasurementCrudUseCases @Inject constructor(
 
             MeasurementWidget.refreshAll(appContext)
 
+            maybeVibrateOnMeasurement()
+
             newId
         } else {
             // Update path
@@ -127,4 +135,25 @@ class MeasurementCrudUseCases @Inject constructor(
     suspend fun recalculateDerivedValuesForMeasurement(measurementId: Int) {
         databaseRepository.recalculateDerivedValuesForMeasurement(measurementId)
     }
+
+    private suspend fun maybeVibrateOnMeasurement() {
+        val enabled = runCatching { settingsFacade.hapticOnMeasurement.first() }.getOrDefault(false)
+        if (!enabled) return
+
+        val now = System.currentTimeMillis()
+        if (now - lastVibrateTime < 1500) {
+            return
+        }
+        lastVibrateTime = now
+
+        val vm = appContext.getSystemService(VibratorManager::class.java)
+        val vibrator: Vibrator = vm.defaultVibrator
+        if (!vibrator.hasVibrator()) return
+
+        val effect = VibrationEffect.createOneShot(
+            500L,
+            255
+        )
+        vibrator.vibrate(effect)
+    }
 }

android_app/app/src/main/java/com/health/openscale/ui/screen/settings/GeneralSettingsScreen.kt

@@ -44,6 +44,7 @@ import androidx.compose.material.icons.filled.Description
 import androidx.compose.material.icons.filled.Info
 import androidx.compose.material.icons.filled.Language
 import androidx.compose.material.icons.filled.Notifications
+import androidx.compose.material.icons.filled.Vibration
 import androidx.compose.material.icons.filled.Warning
 import androidx.compose.material3.AlertDialog
 import androidx.compose.material3.Card
@@ -110,6 +111,7 @@ fun GeneralSettingsScreen(
 
     val currentLanguageCode by sharedViewModel.appLanguageCode.collectAsState(initial = null)
     var expandedLanguageMenu by remember { mutableStateOf(false) }
+    val hapticsEnabled by sharedViewModel.hapticOnMeasurement.collectAsState(initial = false)
 
     val selectedLanguage: SupportedLanguage = remember(currentLanguageCode, supportedLanguagesEnumEntries) {
         val systemDefault = SupportedLanguage.getDefault().code
@@ -332,6 +334,34 @@ fun GeneralSettingsScreen(
             }
         }
 
+        // ---- Haptic section ----
+        SettingsSectionTitle(text = stringResource(R.string.settings_feedback_title))
+
+        SettingsGroup(
+            leadingIcon = {
+                Icon(
+                    imageVector = Icons.Filled.Vibration,
+                    contentDescription = null,
+                    tint = MaterialTheme.colorScheme.onSurfaceVariant
+                )
+            },
+            title = stringResource(R.string.settings_haptics_label),
+            checked = hapticsEnabled,
+            onCheckedChange = { enabled ->
+                scope.launch {
+                    sharedViewModel.setHapticOnMeasurement(enabled)
+                    sharedViewModel.showSnackbar(
+                        if (enabled)
+                            context.getString(R.string.settings_haptics_enabled_snackbar)
+                        else
+                            context.getString(R.string.settings_haptics_disabled_snackbar)
+                    )
+                }
+            },
+            content = {
+            }
+        )
+
         // --- Reminder ---
         SettingsSectionTitle(text = stringResource(R.string.settings_reminder_title))
 
@@ -625,12 +655,11 @@ fun SettingsGroup(
         }
 
         if (checked) {
-            Spacer(Modifier.height(8.dp))
             content()
         }
 
         if (persistentContent != null) {
-            if (!checked) Spacer(Modifier.height(8.dp))
+            if (!checked)
             persistentContent()
         }
     }

android_app/app/src/main/res/values-de/strings.xml

@@ -334,6 +334,11 @@
     <string name="sunday_short">So</string>
     <string name="all">Alle</string>
 
+    <string name="settings_feedback_title">Feedback</string>
+    <string name="settings_haptics_label">Vibration bei neuem Messwert</string>
+    <string name="settings_haptics_enabled_snackbar">Vibration bei Messwerten aktiviert</string>
+    <string name="settings_haptics_disabled_snackbar">Vibration bei Messwerten deaktiviert</string>
+
     <!-- Diagramm Einstellungen -->
     <string name="setting_show_chart_points">Datenpunkte anzeigen</string>
     <string name="setting_smoothing_algorithm">Glättungsalgorithmus</string>

android_app/app/src/main/res/values/strings.xml

@@ -336,6 +336,11 @@
     <string name="sunday_short">Sun</string>
     <string name="all">All</string>
 
+    <string name="settings_feedback_title">Feedback</string>
+    <string name="settings_haptics_label">Vibration on new measurement</string>
+    <string name="settings_haptics_enabled_snackbar">Vibration on measurements enabled</string>
+    <string name="settings_haptics_disabled_snackbar">Vibration on measurements disabled</string>
+
     <!-- Chart Settings Screen -->
     <string name="setting_show_chart_points">Show data points</string>
     <string name="setting_smoothing_algorithm">Smoothing Algorithm</string>