Better error handling

lib/main.dart

@@ -1,3 +1,5 @@
+import 'dart:developer' as developer;
+
 import 'package:firebase_core/firebase_core.dart';
 import 'package:firebase_crashlytics/firebase_crashlytics.dart';
 import 'package:flutter/material.dart';
@@ -10,6 +12,8 @@ import 'l10n/app_localizations.dart';
 import 'main_screen.dart';
 import 'preferences.dart';
 
+final messengerKey = GlobalKey<ScaffoldMessengerState>();
+
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
   await Firebase.initializeApp();
@@ -36,8 +40,12 @@ class _MainAppState extends State<MainApp> {
     super.initState();
     WidgetsBinding.instance.addPostFrameCallback((_) async {
       await rateMyApp.init();
-      if (mounted && rateMyApp.shouldOpenDialog) {  
+      if (mounted && rateMyApp.shouldOpenDialog) {
-        rateMyApp.showRateDialog(context);
+        try {
+          await rateMyApp.showRateDialog(context);
+        } catch (error) {
+          developer.log('Failed to show rate dialog', error: error);
+        }
       }
     });
   }
@@ -45,6 +53,7 @@ class _MainAppState extends State<MainApp> {
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
+      scaffoldMessengerKey: messengerKey,
       localizationsDelegates: AppLocalizations.localizationsDelegates,
       supportedLocales: AppLocalizations.supportedLocales,
       theme: ThemeData(

lib/main_screen.dart

@@ -1,6 +1,6 @@
-import 'dart:developer' as developer;
-
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import 'package:traccar_client/main.dart';
 import 'package:traccar_client/password_service.dart';
 import 'package:traccar_client/preferences.dart';
 import 'package:flutter_background_geolocation/flutter_background_geolocation.dart' as bg;
@@ -97,8 +97,14 @@ class _MainScreenState extends State<MainScreen> {
               onChanged: (bool value) async {
                 if (await PasswordService.authenticate(context) && mounted) {
                   if (value) {
-                    bg.BackgroundGeolocation.start();
+                    try {
-                    _checkBatteryOptimizations(context);
+                      await bg.BackgroundGeolocation.start();
+                      if (mounted) {
+                        _checkBatteryOptimizations(context);
+                      }
+                    } on PlatformException catch (error) {
+                      messengerKey.currentState?.showSnackBar(SnackBar(content: Text(error.message ?? error.code)));
+                    }
                   } else {
                     bg.BackgroundGeolocation.stop();
                   }
@@ -126,8 +132,8 @@ class _MainScreenState extends State<MainScreen> {
                   onPressed: () async {
                     try {
                       await bg.BackgroundGeolocation.getCurrentPosition(samples: 1, persist: true, extras: {'manual': true});
-                    } catch (error) {
+                    } on PlatformException catch (error) {
-                      developer.log('Failed to fetch location', error: error);
+                      messengerKey.currentState?.showSnackBar(SnackBar(content: Text(error.message ?? error.code)));
                     }
                   },
                   child: Text(AppLocalizations.of(context)!.locationButton),

lib/quick_actions.dart

@@ -21,7 +21,6 @@ class _QuickActionsInitializerState extends State<QuickActionsInitializer> {
   void initState() {
     super.initState();
     quickActions.initialize((shortcutType) async {
-      developer.log('action $shortcutType');
       switch (shortcutType) {
         case 'start':
           bg.BackgroundGeolocation.start();

lib/settings_screen.dart

@@ -3,6 +3,7 @@ import 'dart:io';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_background_geolocation/flutter_background_geolocation.dart' as bg;
+import 'package:traccar_client/main.dart';
 import 'package:traccar_client/password_service.dart';
 import 'package:traccar_client/qr_code_screen.dart';
 import 'package:wakelock_partial_android/wakelock_partial_android.dart';
@@ -35,7 +36,6 @@ class _SettingsScreenState extends State<SettingsScreen> {
         : Preferences.instance.getString(key) ?? '';
 
     final controller = TextEditingController(text: initialValue);
-    final scaffoldManager = ScaffoldMessenger.of(context);
     final errorMessage = AppLocalizations.of(context)!.invalidValue;
 
     final result = await showDialog<String>(
@@ -64,7 +64,7 @@ class _SettingsScreenState extends State<SettingsScreen> {
       if (key == Preferences.url) {
         final uri = Uri.tryParse(result);
         if (uri == null || uri.host.isEmpty || !(uri.scheme == 'http' || uri.scheme == 'https')) {
-          scaffoldManager.showSnackBar(SnackBar(content: Text(errorMessage)));
+          messengerKey.currentState?.showSnackBar(SnackBar(content: Text(errorMessage)));
           return;
         }
       }