#2832 まで解決

lib/widgets/map_widget.dart

@@ -25,7 +25,8 @@ class MapWidget extends StatefulWidget {
   State<MapWidget> createState() => _MapWidgetState();
 }
 
-class _MapWidgetState extends State<MapWidget> {
+class _MapWidgetState extends State<MapWidget> with WidgetsBindingObserver {
+//class _MapWidgetState extends State<MapWidget> {
   final IndexController indexController = Get.find<IndexController>();
   final DestinationController destinationController =
       Get.find<DestinationController>();
@@ -46,6 +47,11 @@ class _MapWidgetState extends State<MapWidget> {
     _startIdleTimer();
     mapController = MapController();
     indexController.mapController = mapController;
+
+    // added by Akira
+    WidgetsBinding.instance.addObserver(this);
+    _startIdleTimer();
+
     //_initMarkers();
 
 //    indexController.mapController = MapController(initCompleter: mapControllerCompleter);
@@ -54,22 +60,37 @@ class _MapWidgetState extends State<MapWidget> {
 
   @override
   void dispose() {
+    WidgetsBinding.instance.removeObserver(this); // added
+
     mapController?.dispose();
     _timer?.cancel();
     super.dispose();
   }
 
+  // added by Akira
+  @override
+  void didChangeAppLifecycleState(AppLifecycleState state) {
+    if (state == AppLifecycleState.resumed) {
+      _resetTimer();
+    }
+  }
+
+  // _centerMapOnUser を10秒間でコール
   void _startIdleTimer() {
     _timer = Timer(const Duration(milliseconds: (1000 * 10)), _centerMapOnUser);
   }
 
+  // タイマーをリセットして_startIdleTimer をコール
   void _resetTimer() {
     _timer?.cancel();
     _startIdleTimer();
   }
 
+  // マッぷを現在位置を中心にする。
   void _centerMapOnUser() {
-    destinationController.centerMapToCurrentLocation();
+    if (mounted) {
+      destinationController.centerMapToCurrentLocation();
+    }
   }
 
   Future<void> _initMarkers() async {
@@ -172,8 +193,7 @@ class _MapWidgetState extends State<MapWidget> {
               context: context,
               isScrollControlled: true,
               isDismissible: true,
-              builder: ((context) => BottomSheetNew(
-                  destination: des, isAlreadyCheckedIn: value.isNotEmpty)),
+              builder: ((context) => BottomSheetNew(destination: des, isAlreadyCheckedIn: value.isNotEmpty)),
             ).whenComplete(() {
               destinationController.shouldShowBottomSheet = true;
               destinationController.skipGps = false;
@@ -378,7 +398,7 @@ class _MapWidgetState extends State<MapWidget> {
           stream: locationController.locationMarkerPositionStream,
           builder: (context, snapshot) {
             if (!snapshot.hasData) {
-              print("====== Not display current marker");
+              debugPrint("====== Not display current marker");
             }
             return Container();
           },