Android のバックグラウンドGPSを組み込み

lib/utils/location_controller.dart

@@ -39,6 +39,8 @@ class LocationController extends GetxController {
   LatLng? lastValidLocation;
   DateTime lastGPSDataReceivedTime = DateTime.now();  // 最後にGPSデータを受け取った時刻
 
+  bool gpsDebugMode = false;
+  /*
   // GPSシミュレーション用のメソッドを追加
   void setSimulationMode(bool value) {
     isSimulationMode = value;
@@ -52,7 +54,7 @@ class LocationController extends GetxController {
   bool isSimulationMode = false;
 
   // GPS信号強度をシミュレートするための変数
-  final Rx<String> _simulatedSignalStrength = Rx<String>('low');
+  final Rx<String> _simulatedSignalStrength = Rx<String>('high');
 
   // GPS信号強度をシミュレートするための関数
   void setSimulatedSignalStrength(String strength) {
@@ -72,31 +74,38 @@ class LocationController extends GetxController {
     return _simulatedSignalStrength.value;
   }
 
+   */
+
   //
   // ====== Akira , GPS信号強度をシミュレート ==== ここまで
 
 
-  // GPS信号が弱い場合のフラグ. 本番では、true,high にする。
-  bool isGpsSignalWeak = true;
-  RxString latestSignalStrength = 'low'.obs;
+  // GPS信号が弱い場合のフラグ. 本番では、false,high にする。
+  bool isGpsSignalWeak = false;
+  RxString latestSignalStrength = 'high'.obs;
   //final _latestSignalStrength = 'low'.obs; // 初期値を設定
   //String get latestSignalStrength => _latestSignalStrength.value;
   Stream<String> get gpsSignalStrengthStream => latestSignalStrength.stream;
 
+  bool isRunningBackgroundGPS=false;
+  int activeEngineCount = 0;
 
   // GPS信号の強弱を判断するメソッドを追加. 10m 以内：強、30m以内：中、それ以上：弱
   //
   String getGpsSignalStrength(Position? position) {
     if (position == null) {
+      gpsDebugMode ? debugPrint("getGpsSignalStrength position is null.") : null;
       latestSignalStrength.value = "low";
       isGpsSignalWeak = true;
       return 'low';
     }
     final accuracy = position.accuracy;
-    //debugPrint("getGpsSignalStrength : ${accuracy}");
+    gpsDebugMode ? debugPrint("getGpsSignalStrength : ${accuracy}") : null;
+    /*
     if(isSimulationMode){
       return _simulatedSignalStrength.value;  // GPS信号強度シミュレーション
     }else {
+     */
       if (accuracy <= 10) {
         latestSignalStrength.value = "high";
         isGpsSignalWeak = false;
@@ -110,7 +119,7 @@ class LocationController extends GetxController {
         isGpsSignalWeak = true;
         return 'low';
       }
-    }
+   // }
   }
 
   // 現在位置を調整するメソッドを追加
@@ -130,7 +139,7 @@ class LocationController extends GetxController {
       //debugPrint("=== adjustCurrentLocation (Position:Get and return Valid location:${position} ... )===");
       lastValidLocation = LatLng(position.latitude, position.longitude);
     }
-    return lastValidLocation ?? LatLng(position.latitude, position.longitude);
+    return lastValidLocation ?? LatLng(lastValidLocation!.latitude, lastValidLocation!.longitude);
   }
 
   //===== Akira Added 2024-4-9 end
@@ -256,7 +265,7 @@ class LocationController extends GetxController {
     // 位置情報の設定を行います。z11
     // Set up the location options
     const locationOptions =
-        LocationSettings(accuracy: LocationAccuracy.high, distanceFilter: 0);
+        LocationSettings(accuracy: LocationAccuracy.medium, distanceFilter: 0);
 
     // 既存の位置情報のストリームをキャンセルします。
     await positionStream?.cancel();
@@ -265,11 +274,14 @@ class LocationController extends GetxController {
     //
     positionStream = Geolocator.getPositionStream(locationSettings: locationOptions).listen(
       (Position? position) {
+        gpsDebugMode ? debugPrint("Position = ${position}"):null;
         final signalStrength = getGpsSignalStrength(position);
         if (signalStrength == 'low') {
           isGpsSignalWeak = true;
+          gpsDebugMode ? debugPrint("LocationController.getPositionStream : isGpsSignalWeak = ${isGpsSignalWeak}"):null;
         } else {
           isGpsSignalWeak = false;
+          gpsDebugMode ? debugPrint("LocationController.getPositionStream : isGpsSignalWeak = ${isGpsSignalWeak}"):null;
         }
 
         final DestinationController destinationController = Get.find<DestinationController>();
@@ -349,9 +361,15 @@ class LocationController extends GetxController {
 
 
   void handleLocationUpdate(LocationMarkerPosition? position) async {
-    if (position != null) {
-      //debugPrint("position = ${position}");
-      /*
+    //debugPrint("locationController.handleLocationUpdate");
+    try {
+      if (position != null) {
+        double currentLat = position.latitude;
+        double currentLon = position.longitude;
+        //debugPrint("Flutter: Received GPS signal. Latitude: $currentLat, Longitude: $currentLon");
+
+        //debugPrint("position = ${position}");
+        /*
       currentPosition.value = position;
       final locationMarkerPosition = LocationMarkerPosition(
         latitude: position.latitude,
@@ -359,8 +377,13 @@ class LocationController extends GetxController {
         accuracy: position.accuracy,
       );
        */
-      lastGPSDataReceivedTime = DateTime.now();       // 最後にGPS信号を受け取った時刻
-      locationMarkerPositionStreamController.add(position);
+        lastGPSDataReceivedTime = DateTime.now(); // 最後にGPS信号を受け取った時刻
+        locationMarkerPositionStreamController.add(position);
+      }else{
+        gpsDebugMode ? debugPrint("Flutter: No GPS signal received."):null;
+      }
+    } catch( e ) {
+      debugPrint("Flutter: Error in handleLocationUpdate: $e");
     }
   }