fix all build context warnings

analysis_options.yaml

@@ -26,8 +26,6 @@ linter:
   # `// ignore_for_file: name_of_lint` syntax on the line or in the file
   # producing the lint.
   rules:
-  # FIXME: HAS20230406: At least as long as https://github.com/dart-lang/linter/issues/3943 is open
-      use_build_context_synchronously: false
   # avoid_print: false  # Uncomment to disable the `avoid_print` rule
   # prefer_single_quotes: true  # Uncomment to enable the `prefer_single_quotes` rule
 

lib/actions/analyse_activities.dart

@@ -13,44 +13,55 @@ Future<void> analyseActivities({
   int index = 0;
   int percent;
 
-  ScaffoldMessenger.of(context).showSnackBar(
-    SnackBar(
-      duration: const Duration(seconds: 5),
-      content: Row(
-        children: [
-          MyIcon.finishedWhite,
-          const Text(' Calculating...'),
-        ],
+  if (context.mounted) {
+    ScaffoldMessenger.of(context).showSnackBar(
+      SnackBar(
+        duration: const Duration(seconds: 5),
+        content: Row(
+          children: [
+            MyIcon.finishedWhite,
+            const Text(' Calculating...'),
+          ],
+        ),
       ),
-    ),
-  );
+    );
+  }
 
   for (final Activity activity in activities) {
     index += 1;
     await activity.setAverages();
-    ScaffoldMessenger.of(context).removeCurrentSnackBar();
+    if (context.mounted) {
+      ScaffoldMessenger.of(context).removeCurrentSnackBar();
+    }
     percent = 100 * index ~/ activities.length;
+    if (context.mounted) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(
+          duration: const Duration(seconds: 2),
+          content: Row(children: [
+            CircularProgressIndicator(
+                value: percent / 100, color: MyColor.progress),
+            Text(' recalculating »${activity.name}«')
+          ]),
+        ),
+      );
+    }
+  }
+
+  if (context.mounted) {
+    ScaffoldMessenger.of(context).removeCurrentSnackBar();
+  }
+  if (context.mounted) {
     ScaffoldMessenger.of(context).showSnackBar(
       SnackBar(
-        duration: const Duration(seconds: 2),
-        content: Row(children: [
-          CircularProgressIndicator(value: percent / 100, color: MyColor.progress),
-          Text(' recalculating »${activity.name}«')
-        ]),
+        duration: const Duration(seconds: 5),
+        content: Row(
+          children: [
+            MyIcon.finishedWhite,
+            const Text(' Averages are now up to date.')
+          ],
+        ),
       ),
     );
   }
-
-  ScaffoldMessenger.of(context).removeCurrentSnackBar();
-  ScaffoldMessenger.of(context).showSnackBar(
-    SnackBar(
-      duration: const Duration(seconds: 5),
-      content: Row(
-        children: [
-          MyIcon.finishedWhite,
-          const Text(' Averages are now up to date.')
-        ],
-      ),
-    ),
-  );
 }

lib/actions/auto_tagging.dart

@@ -10,17 +10,19 @@ Future<void> autoTagging({
   required Athlete athlete,
 }) async {
   if (await athlete.checkForSchemas()) {
-    ScaffoldMessenger.of(context).showSnackBar(
-      SnackBar(
-        duration: const Duration(seconds: 5),
-        content: Row(
-          children: [
-            MyIcon.finishedWhite,
-            const Text('Started cleaning up...'),
-          ],
+    if (context.mounted) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(
+          duration: const Duration(seconds: 5),
+          content: Row(
+            children: [
+              MyIcon.finishedWhite,
+              const Text('Started cleaning up...'),
+            ],
+          ),
         ),
-      ),
-    );
+      );
+    }
 
     List<Activity> activities;
     activities = await athlete.activities;
@@ -28,61 +30,74 @@ Future<void> autoTagging({
     int percent;
 
     await TagGroup.deleteAllAutoTags(athlete: athlete);
-    ScaffoldMessenger.of(context).showSnackBar(
-      SnackBar(
-        duration: const Duration(seconds: 2),
-        content: Row(
-          children: [
-            MyIcon.finishedWhite,
-            const Text('All existing autotaggings have been deleted.'),
-          ],
+    if (context.mounted) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(
+          duration: const Duration(seconds: 2),
+          content: Row(
+            children: [
+              MyIcon.finishedWhite,
+              const Text('All existing autotaggings have been deleted.'),
+            ],
+          ),
         ),
-      ),
-    );
+      );
+    }
 
     for (final Activity activity in activities) {
       index += 1;
       await activity.autoTagger(athlete: athlete);
-      ScaffoldMessenger.of(context).removeCurrentSnackBar();
+      if (context.mounted) {
+        ScaffoldMessenger.of(context).removeCurrentSnackBar();
+      }
       percent = 100 * index ~/ activities.length;
 
+      if (context.mounted) {
+        ScaffoldMessenger.of(context).showSnackBar(
+          SnackBar(
+            duration: const Duration(seconds: 2),
+            content: Row(
+              children: [
+                CircularProgressIndicator(
+                    value: percent / 100, color: MyColor.progress),
+                Text(' $percent% done (autotagging »${activity.name}« )'),
+              ],
+            ),
+          ),
+        );
+      }
+    }
+
+    if (context.mounted) {
+      ScaffoldMessenger.of(context).removeCurrentSnackBar();
+    }
+    if (context.mounted) {
       ScaffoldMessenger.of(context).showSnackBar(
         SnackBar(
-          duration: const Duration(seconds: 2),
+          duration: const Duration(seconds: 5),
           content: Row(
             children: [
-              CircularProgressIndicator(value: percent / 100, color: MyColor.progress),
-              Text(' $percent% done (autotagging »${activity.name}« )'),
+              MyIcon.finishedWhite,
+              const Text(' Autotaggings are now up to date.'),
             ],
           ),
         ),
       );
     }
-
-    ScaffoldMessenger.of(context).removeCurrentSnackBar();
-    ScaffoldMessenger.of(context).showSnackBar(
-      SnackBar(
-        duration: const Duration(seconds: 5),
-        content: Row(
-          children: [
-            MyIcon.finishedWhite,
-            const Text(' Autotaggings are now up to date.'),
-          ],
-        ),
-      ),
-    );
   } else {
-    ScaffoldMessenger.of(context).showSnackBar(
-      SnackBar(
-        duration: const Duration(seconds: 5),
-        content: Row(
-          children: [
-            MyIcon.finishedWhite,
-            const Text(' Please set up Power Zone Schema and '
-                'Heart Rate Zone Schema first!'),
-          ],
+    if (context.mounted) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(
+          duration: const Duration(seconds: 5),
+          content: Row(
+            children: [
+              MyIcon.finishedWhite,
+              const Text(' Please set up Power Zone Schema and '
+                  'Heart Rate Zone Schema first!'),
+            ],
+          ),
         ),
-      ),
-    );
+      );
+    }
   }
 }

lib/actions/download_activity.dart

@@ -21,16 +21,18 @@ Future<void> downloadActivity({
 
   await activity.download(athlete: athlete);
 
-  ScaffoldMessenger.of(context).removeCurrentSnackBar();
-  ScaffoldMessenger.of(context).showSnackBar(
-    SnackBar(
-      duration: const Duration(seconds: 2),
-      content: Row(
-        children: [
-          MyIcon.finishedWhite,
-          const Text(' Download finished'),
-        ],
+  if (context.mounted) {
+    ScaffoldMessenger.of(context).removeCurrentSnackBar();
+    ScaffoldMessenger.of(context).showSnackBar(
+      SnackBar(
+        duration: const Duration(seconds: 2),
+        content: Row(
+          children: [
+            MyIcon.finishedWhite,
+            const Text(' Download finished'),
+          ],
+        ),
       ),
-    ),
-  );
+    );
+  }
 }

lib/actions/download_demo_data.dart

@@ -24,17 +24,19 @@ Future<void> downloadDemoData({
       'upper_palatinate_winter_challenge_half_marathon.fit',
     ];
 
-    ScaffoldMessenger.of(context).removeCurrentSnackBar();
-    ScaffoldMessenger.of(context).showSnackBar(
-      SnackBar(
-        content: Row(
-          children: [
-            MyIcon.stravaDownloadWhite,
-            const Text(' Downloading Demo data ...'),
-          ],
+    if (context.mounted) {
+      ScaffoldMessenger.of(context).removeCurrentSnackBar();
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(
+          content: Row(
+            children: [
+              MyIcon.stravaDownloadWhite,
+              const Text(' Downloading Demo data ...'),
+            ],
+          ),
         ),
-      ),
-    );
+      );
+    }
 
     for (final String filename in fileNames) {
       final Activity activity = Activity.fromLocalDirectory(athlete: athlete);
@@ -52,37 +54,44 @@ Future<void> downloadDemoData({
             activity.excluded != true)
         .toList();
     for (final Activity activity in downloadedActivities) {
-      await parseActivity(
-        context: context,
-        activity: activity,
-        athlete: athlete,
-      );
-      ScaffoldMessenger.of(context).removeCurrentSnackBar();
-
-      ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(' Tagging »${activity.name}«')),
-      );
+      if (context.mounted) {
+        await parseActivity(
+          context: context,
+          activity: activity,
+          athlete: athlete,
+        );
+      }
+      if (context.mounted) {
+        ScaffoldMessenger.of(context).removeCurrentSnackBar();
 
+        ScaffoldMessenger.of(context).showSnackBar(
+          SnackBar(content: Text(' Tagging »${activity.name}«')),
+        );
+      }
       await activity.autoTagger(athlete: athlete);
     }
-    ScaffoldMessenger.of(context).removeCurrentSnackBar();
-    ScaffoldMessenger.of(context).showSnackBar(
-      SnackBar(
-        content: Row(
-          children: [
-            MyIcon.finishedWhite,
-            const Text(' Activities imported!'),
-          ],
+    if (context.mounted) {
+      ScaffoldMessenger.of(context).removeCurrentSnackBar();
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(
+          content: Row(
+            children: [
+              MyIcon.finishedWhite,
+              const Text(' Activities imported!'),
+            ],
+          ),
         ),
-      ),
-    );
+      );
+    }
   } else {
-    ScaffoldMessenger.of(context).removeCurrentSnackBar();
-    ScaffoldMessenger.of(context).showSnackBar(
-      const SnackBar(
-        content: Text(' Please set up Power Zone Schema and Heart'
-            ' Rate Zone Schema first!'),
-      ),
-    );
+    if (context.mounted) {
+      ScaffoldMessenger.of(context).removeCurrentSnackBar();
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(
+          content: Text(' Please set up Power Zone Schema and Heart'
+              ' Rate Zone Schema first!'),
+        ),
+      );
+    }
   }
 }

lib/actions/import_activities_locally.dart

@@ -23,17 +23,19 @@ Future<void> importActivitiesLocally({
   );
 
   await Activity.importFromLocalDirectory(athlete: athlete);
-  ScaffoldMessenger.of(context).showSnackBar(
-    SnackBar(
-      duration: const Duration(seconds: 1),
-      content: Row(
-        children: [
-          MyIcon.finishedWhite,
-          const Text(' Activities moved into application'),
-        ],
+  if (context.mounted) {
+    ScaffoldMessenger.of(context).showSnackBar(
+      SnackBar(
+        duration: const Duration(seconds: 1),
+        content: Row(
+          children: [
+            MyIcon.finishedWhite,
+            const Text(' Activities moved into application'),
+          ],
+        ),
       ),
-    ),
-  );
+    );
+  }
 
   activities = await athlete.activities;
   final List<Activity> downloadedActivities = activities
@@ -44,23 +46,28 @@ Future<void> importActivitiesLocally({
           activity.excluded != true)
       .toList();
   for (final Activity activity in downloadedActivities) {
-    await parseActivity(
-      context: context,
-      activity: activity,
-      athlete: athlete,
-    );
+    if (context.mounted) {
+      await parseActivity(
+        context: context,
+        activity: activity,
+        athlete: athlete,
+      );
+    }
     await activity.autoTagger(athlete: athlete);
   }
-  ScaffoldMessenger.of(context).removeCurrentSnackBar();
-  ScaffoldMessenger.of(context).showSnackBar(
-    SnackBar(
-      duration: const Duration(seconds: 5),
-      content: Row(
-        children: [
-          MyIcon.finishedWhite,
-          const Text(' Activities imported!'),
-        ],
+
+  if (context.mounted) {
+    ScaffoldMessenger.of(context).removeCurrentSnackBar();
+    ScaffoldMessenger.of(context).showSnackBar(
+      SnackBar(
+        duration: const Duration(seconds: 5),
+        content: Row(
+          children: [
+            MyIcon.finishedWhite,
+            const Text(' Activities imported!'),
+          ],
+        ),
       ),
-    ),
-  );
+    );
+  }
 }

lib/actions/parse_activity.dart

@@ -60,12 +60,14 @@ Future<void> parseActivity({
     await log.save();
     activity.nonParsable = true;
     await activity.save();
-    ScaffoldMessenger.of(context).removeCurrentSnackBar();
 
-    ScaffoldMessenger.of(context).showSnackBar(
-      const SnackBar(
-          duration: Duration(seconds: 2),
-          content: Text('Error, see log on home screen for details')),
-    );
+    if (context.mounted) {
+      ScaffoldMessenger.of(context).removeCurrentSnackBar();
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(
+            duration: Duration(seconds: 2),
+            content: Text('Error, see log on home screen for details')),
+      );
+    }
   }
 }

lib/actions/query_strava.dart

@@ -19,16 +19,18 @@ Future<void> queryStrava({
   );
 
   await athlete.queryStrava();
-  ScaffoldMessenger.of(context).removeCurrentSnackBar();
-  ScaffoldMessenger.of(context).showSnackBar(
-    SnackBar(
-      duration: const Duration(seconds: 1),
-      content: Row(
-        children: [
-          MyIcon.finishedWhite,
-          const Text('Download finished'),
-        ],
+  if (context.mounted) {
+    ScaffoldMessenger.of(context).removeCurrentSnackBar();
+    ScaffoldMessenger.of(context).showSnackBar(
+      SnackBar(
+        duration: const Duration(seconds: 1),
+        content: Row(
+          children: [
+            MyIcon.finishedWhite,
+            const Text('Download finished'),
+          ],
+        ),
       ),
-    ),
-  );
+    );
+  }
 }

lib/actions/setup_demo_athlete.dart

@@ -25,10 +25,13 @@ Future<void> setupDemoAthlete({
   weight.date = DateTime(2015);
   await weight.save();
 
-  await downloadDemoData(
-    context: context,
-    athlete: athlete,
-  );
-
-  ScaffoldMessenger.of(context).removeCurrentSnackBar();
+  if (context.mounted) {
+    await downloadDemoData(
+      context: context,
+      athlete: athlete,
+    );
+  }
+  if (context.mounted) {
+    ScaffoldMessenger.of(context).removeCurrentSnackBar();
+  }
 }

lib/actions/update_job.dart

@@ -13,20 +13,24 @@ Future<void> updateJob({
   List<Activity> activities;
 
   if (await athlete.checkForSchemas()) {
-    await queryStrava(
-      context: context,
-      athlete: athlete,
-    );
+    if (context.mounted) {
+      await queryStrava(
+        context: context,
+        athlete: athlete,
+      );
+    }
 
     activities = await athlete.activities;
     final Iterable<Activity> newActivities =
         activities.where((Activity activity) => activity.state == 'new');
     for (final Activity activity in newActivities) {
-      await downloadActivity(
-        context: context,
-        activity: activity,
-        athlete: athlete,
-      );
+      if (context.mounted) {
+        await downloadActivity(
+          context: context,
+          activity: activity,
+          athlete: athlete,
+        );
+      }
     }
 
     final Iterable<Activity> downloadedActivities = activities.where(
@@ -36,37 +40,44 @@ Future<void> updateJob({
             activity.nonParsable != true &&
             activity.excluded != true);
     for (final Activity activity in downloadedActivities) {
-      await parseActivity(
-        context: context,
-        activity: activity,
-        athlete: athlete,
-      );
+      if (context.mounted) {
+        await parseActivity(
+          context: context,
+          activity: activity,
+          athlete: athlete,
+        );
+      }
       await activity.autoTagger(athlete: athlete);
     }
-    ScaffoldMessenger.of(context).removeCurrentSnackBar();
-    ScaffoldMessenger.of(context).showSnackBar(
-      SnackBar(
-        duration: const Duration(seconds: 5),
-        content: Row(
-          children: [
-            MyIcon.finishedWhite,
-            const Text(' You are now up to date!'),
-          ],
+
+    if (context.mounted) {
+      ScaffoldMessenger.of(context).removeCurrentSnackBar();
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(
+          duration: const Duration(seconds: 5),
+          content: Row(
+            children: [
+              MyIcon.finishedWhite,
+              const Text(' You are now up to date!'),
+            ],
+          ),
         ),
-      ),
-    );
+      );
+    }
   } else {
-    ScaffoldMessenger.of(context).showSnackBar(
-      SnackBar(
-        duration: const Duration(seconds: 5),
-        content: Row(
-          children: [
-            MyIcon.finishedWhite,
-            const Text(' Please set up Power Zone Schema and '
-                'Heart Rate Zone Schema first!'),
-          ],
+    if (context.mounted) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(
+          duration: const Duration(seconds: 5),
+          content: Row(
+            children: [
+              MyIcon.finishedWhite,
+              const Text(' Please set up Power Zone Schema and '
+                  'Heart Rate Zone Schema first!'),
+            ],
+          ),
         ),
-      ),
-    );
+      );
+    }
   }
 }

lib/screens/add_heart_rate_zone_schema_screen.dart

@@ -189,7 +189,9 @@ class AddHeartRateZoneSchemaScreenState
   Future<void> saveHeartRateZoneSchema(BuildContext context) async {
     await widget.heartRateZoneSchema.save();
     await HeartRateZone.upsertAll(heartRateZones);
-    Navigator.of(context).pop();
+    if (context.mounted) {
+      Navigator.of(context).pop();
+    }
   }
 
   Future<void> getData() async {
@@ -200,7 +202,9 @@ class AddHeartRateZoneSchemaScreenState
   Future<void> deleteHeartRateZoneSchema(
       {required HeartRateZoneSchema heartRateZoneSchema}) async {
     await heartRateZoneSchema.delete();
-    Navigator.of(context).pop();
+    if (context.mounted) {
+      Navigator.of(context).pop();
+    }
   }
 
   void updateHeartRateZoneBase({int? base}) {
@@ -227,21 +231,25 @@ class AddHeartRateZoneSchemaScreenState
     }
     await HeartRateZone.upsertAll(heartRateZones);
     await getData();
-    showDialog<BuildContext>(
-      context: context,
-      builder: (_) => AlertDialog(
-        title: const Text('Heart Rate Zone Schema has been copied'),
-        content: const Text(
-            'If you only wanted to fix the date you need to delete the old heart'
-            ' rate zone schema manually.'),
-        actions: <Widget>[
-          ElevatedButton(
-            style: MyButtonStyle.raisedButtonStyle(color: MyColor.primary),
-            child: const Text('OK'),
-            onPressed: () => Navigator.of(context).pop(),
-          ),
-        ],
-      ),
-    );
+    if (context.mounted) {
+      showDialog<BuildContext>(
+        context: context,
+        builder: (_) =>
+            AlertDialog(
+              title: const Text('Heart Rate Zone Schema has been copied'),
+              content: const Text(
+                  'If you only wanted to fix the date you need to delete the old heart'
+                      ' rate zone schema manually.'),
+              actions: <Widget>[
+                ElevatedButton(
+                  style: MyButtonStyle.raisedButtonStyle(
+                      color: MyColor.primary),
+                  child: const Text('OK'),
+                  onPressed: () => Navigator.of(context).pop(),
+                ),
+              ],
+            ),
+      );
+    }
   }
 }

lib/screens/add_heart_rate_zone_screen.dart

@@ -169,11 +169,15 @@ class AddHeartRateZoneScreenState extends State<AddHeartRateZoneScreen> {
 
   Future<void> saveHeartRateZone(BuildContext context) async {
     await widget.heartRateZone!.save();
-    Navigator.of(context).pop();
+    if (context.mounted) {
+      Navigator.of(context).pop();
+    }
   }
 
   Future<void> deleteHeartRateZone(BuildContext context) async {
     await widget.heartRateZone!.delete();
-    Navigator.of(context).pop();
+    if (context.mounted) {
+      Navigator.of(context).pop();
+    }
   }
 }

lib/screens/add_power_zone_schema_screen.dart

@@ -182,7 +182,9 @@ class AddPowerZoneSchemaScreenState extends State<AddPowerZoneSchemaScreen> {
   Future<void> savePowerZoneSchema(BuildContext context) async {
     await widget.powerZoneSchema.save();
     await PowerZone.upsertAll(powerZones);
-    Navigator.of(context).pop();
+    if (context.mounted) {
+      Navigator.of(context).pop();
+    }
   }
 
   Future<void> getData() async {
@@ -193,7 +195,9 @@ class AddPowerZoneSchemaScreenState extends State<AddPowerZoneSchemaScreen> {
   Future<void> deletePowerZoneSchema(
       {required PowerZoneSchema powerZoneSchema}) async {
     await powerZoneSchema.delete();
-    Navigator.of(context).pop();
+    if (context.mounted) {
+      Navigator.of(context).pop();
+    }
   }
 
   Future<void>? updatePowerZoneBase({int? base}) {
@@ -221,21 +225,26 @@ class AddPowerZoneSchemaScreenState extends State<AddPowerZoneSchemaScreen> {
     }
     await PowerZone.upsertAll(powerZones);
     await getData();
-    showDialog<BuildContext>(
-      context: context,
-      builder: (_) => AlertDialog(
-        title: const Text('Power Zone Schema has been copied'),
-        content: const Text(
-            'If you only wanted to fix the date you need to delete the old '
-            'power zone schema manually.'),
-        actions: <Widget>[
-          ElevatedButton(
-            style: MyButtonStyle.raisedButtonStyle(color: MyColor.primary),
-            child: const Text('OK'),
-            onPressed: () => Navigator.of(context).pop(),
-          ),
-        ],
-      ),
-    );
+
+    if (context.mounted) {
+      showDialog<BuildContext>(
+        context: context,
+        builder: (_) =>
+            AlertDialog(
+              title: const Text('Power Zone Schema has been copied'),
+              content: const Text(
+                  'If you only wanted to fix the date you need to delete the old '
+                      'power zone schema manually.'),
+              actions: <Widget>[
+                ElevatedButton(
+                  style: MyButtonStyle.raisedButtonStyle(
+                      color: MyColor.primary),
+                  child: const Text('OK'),
+                  onPressed: () => Navigator.of(context).pop(),
+                ),
+              ],
+            ),
+      );
+    }
   }
 }

lib/screens/add_power_zone_screen.dart

@@ -166,11 +166,15 @@ class AddPowerZoneScreenState extends State<AddPowerZoneScreen> {
 
   Future<void> savePowerZone(BuildContext context) async {
     await widget.powerZone!.save();
-    Navigator.of(context).pop();
+    if (context.mounted) {
+      Navigator.of(context).pop();
+    }
   }
 
   Future<void> deletePowerZone(BuildContext context) async {
     await widget.powerZone!.delete();
-    Navigator.of(context).pop();
+    if (context.mounted) {
+      Navigator.of(context).pop();
+    }
   }
 }

lib/screens/add_tag_group_screen.dart

@@ -180,7 +180,9 @@ class AddTagGroupScreenState extends State<AddTagGroupScreen> {
   Future<void> saveTagGroup(BuildContext context) async {
     await widget.tagGroup!.save();
     await Tag.upsertAll(tags);
-    Navigator.of(context).pop();
+    if (context.mounted) {
+      Navigator.of(context).pop();
+    }
   }
 
   Future<void> getData() async {
@@ -190,6 +192,8 @@ class AddTagGroupScreenState extends State<AddTagGroupScreen> {
 
   Future<void> deleteTagGroup({required TagGroup tagGroup}) async {
     await tagGroup.delete();
-    Navigator.of(context).pop();
+    if (context.mounted) {
+      Navigator.of(context).pop();
+    }
   }
 }

lib/screens/add_tag_screen.dart

@@ -105,11 +105,15 @@ class AddTagScreenState extends State<AddTagScreen> {
 
   Future<void> saveTag(BuildContext context) async {
     await widget.tag!.save();
-    Navigator.of(context).pop();
+    if (context.mounted) {
+      Navigator.of(context).pop();
+    }
   }
 
   Future<void> deleteTag(BuildContext context) async {
     await widget.tag!.delete();
-    Navigator.of(context).pop();
+    if (context.mounted) {
+      Navigator.of(context).pop();
+    }
   }
 }

lib/screens/add_weight_screen.dart

@@ -66,11 +66,15 @@ class AddWeightScreen extends StatelessWidget {
 
   Future<void> saveWeight(BuildContext context) async {
     await weight!.save();
-    Navigator.of(context).pop();
+    if (context.mounted) {
+      Navigator.of(context).pop();
+    }
   }
 
   Future<void> deleteWeight(BuildContext context) async {
     await weight!.delete();
-    Navigator.of(context).pop();
+    if (context.mounted) {
+      Navigator.of(context).pop();
+    }
   }
 }

lib/screens/dashboard.dart

@@ -52,13 +52,15 @@ class DashboardState extends State<Dashboard> {
                     title: Text('${athlete.firstName} ${athlete.lastName}'),
                     onTap: () async {
                       await athlete.readCredentials();
-                      await Navigator.push(
-                        context,
-                        MaterialPageRoute<BuildContext>(
-                          builder: (BuildContext context) =>
-                              ShowAthleteScreen(athlete: athlete),
-                        ),
-                      );
+                      if (context.mounted) {
+                        await Navigator.push(
+                          context,
+                          MaterialPageRoute<BuildContext>(
+                            builder: (BuildContext context) =>
+                                ShowAthleteScreen(athlete: athlete),
+                          ),
+                        );
+                      }
                       await getData();
                     },
                   ),
@@ -107,13 +109,15 @@ class DashboardState extends State<Dashboard> {
     athletes = await Athlete.all();
     logs = await Log.one();
     if (athletes.isEmpty) {
-      await Navigator.pushReplacement(
-        context,
-        MaterialPageRoute<BuildContext>(
-          builder: (BuildContext context) =>
-              const OnboardingIntroductionScreen(),
-        ),
-      );
+      if (context.mounted) {
+        await Navigator.pushReplacement(
+          context,
+          MaterialPageRoute<BuildContext>(
+            builder: (BuildContext context) =>
+            const OnboardingIntroductionScreen(),
+          ),
+        );
+      }
     } else {
       final PackageInfo packageInfo = await PackageInfo.fromPlatform();
       version = packageInfo.version;

lib/screens/edit_event_screen.dart

@@ -74,13 +74,17 @@ class EditEventScreenState extends State<EditEventScreen> {
                           firstDate: DateTime(1969),
                           initialDate: currentValue ?? DateTime.now(),
                           lastDate: DateTime(2100));
-                      if (date != null) {
-                        final TimeOfDay? time = await showTimePicker(
-                          context: context,
-                          initialTime: TimeOfDay.fromDateTime(
-                              currentValue ?? DateTime.now()),
-                        );
-                        return DateTimeField.combine(date, time);
+                      if (context.mounted) {
+                        if (date != null) {
+                          final TimeOfDay? time = await showTimePicker(
+                            context: context,
+                            initialTime: TimeOfDay.fromDateTime(
+                                currentValue ?? DateTime.now()),
+                          );
+                          return DateTimeField.combine(date, time);
+                        } else {
+                          return currentValue;
+                        }
                       } else {
                         return currentValue;
                       }
@@ -270,7 +274,9 @@ class EditEventScreenState extends State<EditEventScreen> {
                     child: MyButton.save(
                       onPressed: () async {
                         await widget.record!.save();
-                        Navigator.of(context).pop();
+                        if (context.mounted) {
+                          Navigator.of(context).pop();
+                        }
                       },
                     ),
                   ),

lib/screens/onboarding_screens/onboarding_body_weight_screen.dart

@@ -71,11 +71,13 @@ class OnBoardingBodyWeightScreenState
   Future<void> nextButton() async {
     await widget.athlete!.save();
     debugPrint('OK');
-    Navigator.pushReplacement(
-      context,
-      MaterialPageRoute<BuildContext>(
-        builder: (BuildContext _) => const OnboardingFinishedScreen(),
-      ),
-    );
+    if (context.mounted) {
+      Navigator.pushReplacement(
+        context,
+        MaterialPageRoute<BuildContext>(
+          builder: (BuildContext _) => const OnboardingFinishedScreen(),
+        ),
+      );
+    }
   }
 }

lib/screens/onboarding_screens/onboarding_create_user.dart

@@ -55,13 +55,15 @@ class OnboardingCreateUserScreenState
                           child: const Text('Create Demo User'),
                           onPressed: () async {
                             await setupDemoAthlete(context: context);
-                            await Navigator.pushReplacement(
-                              context,
-                              MaterialPageRoute<BuildContext>(
-                                builder: (BuildContext _) =>
-                                    const OnboardingFinishedScreen(),
-                              ),
-                            );
+                            if (context.mounted) {
+                              await Navigator.pushReplacement(
+                                context,
+                                MaterialPageRoute<BuildContext>(
+                                  builder: (BuildContext _) =>
+                                      const OnboardingFinishedScreen(),
+                                ),
+                              );
+                            }
                           },
                         )
                       ],
@@ -95,14 +97,16 @@ class OnboardingCreateUserScreenState
                                     StravaGetUser(athlete: athlete),
                               ),
                             );
-                            Navigator.pushReplacement(
-                              context,
-                              MaterialPageRoute<BuildContext>(
-                                builder: (BuildContext _) =>
-                                    OnBoardingStravaCredentialsScreen(
-                                        athlete: athlete),
-                              ),
-                            );
+                            if (context.mounted) {
+                              Navigator.pushReplacement(
+                                context,
+                                MaterialPageRoute<BuildContext>(
+                                  builder: (BuildContext _) =>
+                                      OnBoardingStravaCredentialsScreen(
+                                          athlete: athlete),
+                                ),
+                              );
+                            }
                           },
                         )
                       ],

lib/screens/onboarding_screens/onboarding_heart_rate_zone_schema_screen.dart

@@ -77,13 +77,16 @@ class OnBoardingHeartRateZoneSchemaScreenState
 
   Future<void> nextButton() async {
     await widget.athlete!.save();
-    Navigator.pushReplacement(
-      context,
-      MaterialPageRoute<BuildContext>(
-        builder: (BuildContext _) => OnBoardingBodyWeightScreen(
-          athlete: widget.athlete,
+    if (context.mounted) {
+      Navigator.pushReplacement(
+        context,
+        MaterialPageRoute<BuildContext>(
+          builder: (BuildContext _) =>
+              OnBoardingBodyWeightScreen(
+                athlete: widget.athlete,
+              ),
         ),
-      ),
-    );
+      );
+    }
   }
 }

lib/screens/onboarding_screens/onboarding_power_zone_schema_screen.dart

@@ -75,13 +75,16 @@ class OnBoardingPowerZoneSchemaScreenState
 
   Future<void> nextButton() async {
     await widget.athlete!.save();
-    Navigator.pushReplacement(
-      context,
-      MaterialPageRoute<BuildContext>(
-        builder: (BuildContext _) => OnBoardingHeartRateZoneSchemaScreen(
-          athlete: widget.athlete,
+    if (context.mounted) {
+      Navigator.pushReplacement(
+        context,
+        MaterialPageRoute<BuildContext>(
+          builder: (BuildContext _) =>
+              OnBoardingHeartRateZoneSchemaScreen(
+                athlete: widget.athlete,
+              ),
         ),
-      ),
-    );
+      );
+    }
   }
 }

lib/screens/show_activity_screen.dart

@@ -474,18 +474,20 @@ class ShowActivityScreenState extends State<ShowActivityScreen> {
 
     await widget.activity.autoTagger(athlete: widget.athlete);
 
-    ScaffoldMessenger.of(context).removeCurrentSnackBar();
-    ScaffoldMessenger.of(context).showSnackBar(
-      SnackBar(
-        duration: const Duration(seconds: 2),
-        content: Row(
-          children: [
-            MyIcon.finishedWhite,
-            const Text(' Autotagging finished'),
-          ],
+    if (context.mounted) {
+      ScaffoldMessenger.of(context).removeCurrentSnackBar();
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(
+          duration: const Duration(seconds: 2),
+          content: Row(
+            children: [
+              MyIcon.finishedWhite,
+              const Text(' Autotagging finished'),
+            ],
+          ),
         ),
-      ),
-    );
+      );
+    }
     setState(() {});
   }
 
@@ -503,7 +505,9 @@ class ShowActivityScreenState extends State<ShowActivityScreen> {
 
   Future<void> delete() async {
     await widget.activity.delete();
-    Navigator.of(context).pop();
+    if (context.mounted) {
+      Navigator.of(context).pop();
+    }
   }
 
   Future<void> download() async {
@@ -521,26 +525,30 @@ class ShowActivityScreenState extends State<ShowActivityScreen> {
 
     await widget.activity.download(athlete: widget.athlete);
 
-    ScaffoldMessenger.of(context).removeCurrentSnackBar();
-    ScaffoldMessenger.of(context).showSnackBar(
-      SnackBar(
-        duration: const Duration(seconds: 1),
-        content: Row(
-          children: [
-            MyIcon.finishedWhite,
-            const Text(' Download finished'),
-          ],
+    if (context.mounted) {
+      ScaffoldMessenger.of(context).removeCurrentSnackBar();
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(
+          duration: const Duration(seconds: 1),
+          content: Row(
+            children: [
+              MyIcon.finishedWhite,
+              const Text(' Download finished'),
+            ],
+          ),
         ),
-      ),
-    );
+      );
+    }
 
     await parse();
-    ScaffoldMessenger.of(context).showSnackBar(
-      SnackBar(
-        duration: const Duration(seconds: 2),
-        content: Text('Analysis finished for »${widget.activity.name}«'),
-      ),
-    );
+    if (context.mounted) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(
+          duration: const Duration(seconds: 2),
+          content: Text('Analysis finished for »${widget.activity.name}«'),
+        ),
+      );
+    }
   }
 
   Future<void> parse() async {

lib/screens/show_athlete_screen.dart

@@ -332,12 +332,15 @@ class ShowAthleteScreenState extends State<ShowAthleteScreen> {
 
   Future<void> goToEditAthleteScreen({required Athlete athlete}) async {
     await athlete.readCredentials();
-    await Navigator.push(
-      context,
-      MaterialPageRoute<BuildContext>(
-        builder: (BuildContext context) => EditAthleteScreen(athlete: athlete),
-      ),
-    );
+    if (context.mounted) {
+      await Navigator.push(
+        context,
+        MaterialPageRoute<BuildContext>(
+          builder: (BuildContext context) =>
+              EditAthleteScreen(athlete: athlete),
+        ),
+      );
+    }
   }
 
   Future<void> goToEditActivityScreen({required Athlete athlete}) async {

lib/screens/show_interval_screen.dart

@@ -177,7 +177,9 @@ class ShowIntervalScreen extends StatelessWidget {
         onPressed: () async {
           await interval.delete();
           activity!.cachedIntervals = <encrateia.Interval>[];
-          Navigator.of(context).pop();
+          if (context.mounted) {
+            Navigator.of(context).pop();
+          }
         },
       ),
     ];
@@ -215,8 +217,7 @@ class ShowIntervalScreen extends StatelessWidget {
   }) {
     return ElevatedButton.icon(
       style: MyButtonStyle.raisedButtonStyle(
-          color: color,
-          textColor: MyColor.textColor(backgroundColor: color)),
+          color: color, textColor: MyColor.textColor(backgroundColor: color)),
       icon: icon,
       label: Expanded(
         child: Text(title),

lib/screens/strava_get_user.dart

@@ -64,7 +64,9 @@ class StravaGetUserState extends State<StravaGetUser> {
       setState(() {});
     }
     if (widget.athlete.state == 'fromStrava') {
-      Navigator.of(context).pop();
+      if (context.mounted) {
+        Navigator.of(context).pop();
+      }
     }
   }
 }

lib/widgets/activities_list_widget.dart

@@ -113,17 +113,19 @@ class ActivitiesListWidgetState extends State<ActivitiesListWidget> {
     );
 
     await activity.download(athlete: widget.athlete);
-    ScaffoldMessenger.of(context).showSnackBar(
-      SnackBar(
-        duration: const Duration(seconds: 3),
-        content: Row(
-          children: [
-            MyIcon.finishedWhite,
-            const Text(' Download finished'),
-          ],
+    if (context.mounted) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(
+          duration: const Duration(seconds: 3),
+          content: Row(
+            children: [
+              MyIcon.finishedWhite,
+              const Text(' Download finished'),
+            ],
+          ),
         ),
-      ),
-    );
+      );
+    }
 
     setState(() {});
   }

lib/widgets/activity_widgets/edit_activity_widget.dart

@@ -60,13 +60,17 @@ class EditActivityWidgetState extends State<EditActivityWidget> {
                         firstDate: DateTime(1969),
                         initialDate: currentValue ?? DateTime.now(),
                         lastDate: DateTime(2100));
-                    if (date != null) {
-                      final TimeOfDay? time = await showTimePicker(
-                        context: context,
-                        initialTime: TimeOfDay.fromDateTime(
-                            currentValue ?? DateTime.now()),
-                      );
-                      return DateTimeField.combine(date, time);
+                    if (context.mounted) {
+                      if (date != null) {
+                        final TimeOfDay? time = await showTimePicker(
+                          context: context,
+                          initialTime: TimeOfDay.fromDateTime(
+                              currentValue ?? DateTime.now()),
+                        );
+                        return DateTimeField.combine(date, time);
+                      } else {
+                        return currentValue;
+                      }
                     } else {
                       return currentValue;
                     }
@@ -194,7 +198,9 @@ class EditActivityWidgetState extends State<EditActivityWidget> {