Fix sample errors (#8)

* Fix warnings

* Check unzipped directory doesn't already exist to avoid error

* Update apply_scheduled_updates_to_preplanned_map_area_sample.dart

* Update display_points_using_clustering_feature_reduction_sample.dart

* Update find_closest_facility_sample.dart

* Update generate_route_with_directions_sample.dart

* Update suggest_address_sample.dart

Author: jenmerritt

lib/src/sample_data.dart

@@ -28,7 +28,7 @@ Future<void> downloadSampleData(List<String> portalItemIds) async {
 
   for (final itemId in portalItemIds) {
     // create a portal item to ensure it exists and load to access properties
-    var portalItem =
+    final portalItem =
         PortalItem.withUri(Uri.parse('$portal/home/item.html?id=$itemId'));
     if (portalItem != null) {
       await portalItem.load();
@@ -42,10 +42,14 @@ Future<void> downloadSampleData(List<String> portalItemIds) async {
         // if the data is a zip we need to extract it
         // save all files to the device app directory in a directory with the item name without the zip extension
         final nameWithoutExt = itemName.replaceFirst(RegExp(r'.zip$'), '');
-        final dir = Directory.fromUri(Uri.parse('$appDirPath/$nameWithoutExt'));
-        await ZipFile.extractToDirectory(zipFile: file, destinationDir: dir);
-        // clean up the zip folder now that the data has been extracted
-        await file.delete();
+        if (!Directory.fromUri(Uri.parse('$appDirPath/$nameWithoutExt'))
+            .existsSync()) {
+          final dir =
+              Directory.fromUri(Uri.parse('$appDirPath/$nameWithoutExt'));
+          await ZipFile.extractToDirectory(zipFile: file, destinationDir: dir);
+          // clean up the zip folder now that the data has been extracted
+          await file.delete();
+        }
       }
     }
   }

lib/src/samples/apply_scheduled_updates_to_preplanned_map_area_sample.dart

@@ -108,15 +108,19 @@ class ApplyScheduledUpdatesToPreplannedMapAreaState
     try {
       await _mobileMapPackage!.load();
     } catch (err) {
-      showAlertDialog(
-        'Mobile Map Package failed to load with error: {$err}',
-        title: 'Error',
-      );
+      if (mounted) {
+        showAlertDialog(
+          'Mobile Map Package failed to load with error: {$err}',
+          title: 'Error',
+        );
+      }
       return false;
     }
 
     if (_mobileMapPackage!.maps.isEmpty) {
-      showAlertDialog('Mobile map package contains no maps.');
+      if (mounted) {
+        showAlertDialog('Mobile map package contains no maps.');
+      }
       return false;
     }
 
@@ -138,13 +142,14 @@ class ApplyScheduledUpdatesToPreplannedMapAreaState
   Future<void> checkForUpdates() async {
     if (!_isInitialized) return;
     final updatesInfo = await _offlineMapSyncTask!.checkForUpdates();
-
-    setState(() {
-      _updateStatus = updatesInfo.downloadAvailability;
-      _updateSizeKB = updatesInfo.scheduledUpdatesDownloadSize / 1024;
-      _canUpdate = updatesInfo.downloadAvailability ==
-          OfflineUpdateAvailability.available;
-    });
+    if (mounted) {
+      setState(() {
+        _updateStatus = updatesInfo.downloadAvailability;
+        _updateSizeKB = updatesInfo.scheduledUpdatesDownloadSize / 1024;
+        _canUpdate = updatesInfo.downloadAvailability ==
+            OfflineUpdateAvailability.available;
+      });
+    }
   }
 
   void syncUpdates() {
@@ -164,10 +169,12 @@ class ApplyScheduledUpdatesToPreplannedMapAreaState
       // Refresh the update status
       checkForUpdates();
     }, onError: (err) {
-      showAlertDialog(
-        'The offline map sync failed with error: {$err}.',
-        title: 'Error',
-      );
+      if (mounted) {
+        showAlertDialog(
+          'The offline map sync failed with error: {$err}.',
+          title: 'Error',
+        );
+      }
     });
   }
 

lib/src/samples/display_points_using_clustering_feature_reduction_sample.dart

@@ -70,7 +70,7 @@ class DisplayPointsUsingClusteringFeatureReductionSampleState
   void onMapViewReady() async {
     _mapViewController.arcGISMap = _map;
     await _map.load();
-    if (_map.loadStatus == LoadStatus.loaded) {
+    if (_map.loadStatus == LoadStatus.loaded && mounted) {
       setState(() => _ready = true);
     }
   }

lib/src/samples/find_closest_facility_sample.dart

@@ -119,7 +119,9 @@ class FindClosestFacilitySampleState extends State<FindClosestFacilitySample> {
     _closestFacilityParameters = await generateClosestFacilityParameters(
         facilitiesLayer, incidentsLayer);
 
-    setState(() => _isInitialized = true);
+    if (mounted) {
+      setState(() => _isInitialized = true);
+    }
   }
 
   FeatureLayer buildFeatureLayer(Uri tableUri, Uri imageUri) {
@@ -177,8 +179,9 @@ class FindClosestFacilitySampleState extends State<FindClosestFacilitySample> {
         _routeGraphicsOverlay.graphics.add(routeGraphic);
       }
     }
-
-    setState(() => _isRouteSolved = true);
+    if (mounted) {
+      setState(() => _isRouteSolved = true);
+    }
   }
 
   void resetRoutes() {

lib/src/samples/generate_route_with_directions_sample.dart

@@ -97,10 +97,11 @@ class GenerateRouteWithDirectionsSampleState
     initMap();
     initStops();
     await initRouteParameters();
-
-    setState(() {
-      _isReady = true;
-    });
+    if (mounted) {
+      setState(() {
+        _isReady = true;
+      });
+    }
   }
 
   void initMap() {
@@ -176,7 +177,9 @@ class GenerateRouteWithDirectionsSampleState
     final routeResult =
         await _routeTask.solveRoute(routeParameters: _routeParameters);
     if (routeResult.routes.isEmpty) {
-      showAlertDialog('No routes have been generated.', title: 'Info');
+      if (mounted) {
+        showAlertDialog('No routes have been generated.', title: 'Info');
+      }
       return;
     }
 
@@ -188,10 +191,12 @@ class GenerateRouteWithDirectionsSampleState
       _routeGraphicsOverlay.graphics.add(routeGraphic);
     }
 
-    setState(() {
-      _directions = route.directionManeuvers;
-      _isRouteGenerated = true;
-    });
+    if (mounted) {
+      setState(() {
+        _directions = route.directionManeuvers;
+        _isRouteGenerated = true;
+      });
+    }
   }
 
   Dialog showDirections(BuildContext context) {

lib/src/samples/suggest_address_sample.dart

@@ -172,8 +172,9 @@ class SuggestAddressSampleState extends State<SuggestAddressSample> {
 
     final suggestResults = await _suggestOperation!.value;
     _suggestOperation = null;
-
-    setState(() => _suggestResults = List.from(suggestResults));
+    if (mounted) {
+      setState(() => _suggestResults = List.from(suggestResults));
+    }
 
     if (_suggestAgain != null) {
       // start again with the latest input value