feat: add location permission, add permission related error handling

example/android/settings.gradle

 plugins {
     id "dev.flutter.flutter-plugin-loader" version "1.0.0"
     id "com.android.application" version "8.1.3" apply false
-    id "org.jetbrains.kotlin.android" version "1.7.10" apply false
+    id "org.jetbrains.kotlin.android" version "1.9.0" apply false
 }
 
 include ":app"

example/lib/main.dart

 import 'package:flutter/services.dart';
 import 'package:flutter_zsdk/flutter_zsdk.dart';
 import 'package:flutter_zsdk/src/models/flutter_zsdk_exception.dart';
+import 'package:flutter_zsdk/src/models/error_code.dart';
 import 'package:flutter_zsdk_example/models/bluetooth_printer.dart';
 
 void main() {
       inspect(e);
       showSnackBar(e.message);
 
+      if (e.code == ErrorCode.locationServiceDisabled) {
+        showDialog(
+          context: context, 
+          builder: (context) => AlertDialog(
+            title: Text('Location service disabled'),
+            content: Text(
+              'This app require location service to scan bluetooth printers, please turn on location service on your device'
+            ),
+          ),
+        );
+      }
+
     } catch (e) {
       inspect(e);
       showSnackBar('Unexpected error while discovering bluetooth printers');

example/pubspec.lock

     description: flutter
     source: sdk
     version: "0.0.0"
+  http_parser:
+    dependency: transitive
+    description:
+      name: http_parser
+      sha256: "2aa08ce0341cc9b354a498388e30986515406668dbcc4f7c950c3e715496693b"
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.0.2"
   integration_test:
     dependency: "direct dev"
     description: flutter
     source: sdk
     version: "0.0.0"
+  js:
+    dependency: transitive
+    description:
+      name: js
+      sha256: f2c445dce49627136094980615a031419f7f3eb393237e4ecd97ac15dea343f3
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.6.7"
   leak_tracker:
     dependency: transitive
     description:
       url: "https://pub.dev"
     source: hosted
     version: "3.0.0"
+  location:
+    dependency: transitive
+    description:
+      name: location
+      sha256: "6463a242973bf247e3fb1c7722919521b98026978ee3b5177202e103a39c145e"
+      url: "https://pub.dev"
+    source: hosted
+    version: "7.0.0"
+  location_platform_interface:
+    dependency: transitive
+    description:
+      name: location_platform_interface
+      sha256: "1e535ccc8b4a9612de4e4319871136b45d2b5d1fb0c2a8bf99687242bf7ca5f7"
+      url: "https://pub.dev"
+    source: hosted
+    version: "5.0.0"
+  location_web:
+    dependency: transitive
+    description:
+      name: location_web
+      sha256: e6435cfd175b0f6e94d6fdc43c104d13cec7e27b21a8cee00bd9516a3d6a4c81
+      url: "https://pub.dev"
+    source: hosted
+    version: "5.0.4"
   matcher:
     dependency: transitive
     description:
       url: "https://pub.dev"
     source: hosted
     version: "0.7.2"
+  typed_data:
+    dependency: transitive
+    description:
+      name: typed_data
+      sha256: f9049c039ebfeb4cf7a7104a675823cd72dba8297f264b6637062516699fa006
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.4.0"
   vector_math:
     dependency: transitive
     description:
     dependency: transitive
     description:
       name: web
-      sha256: "97da13628db363c635202ad97068d47c5b8aa555808e7a9411963c533b449b27"
+      sha256: "868d88a33d8a87b18ffc05f9f030ba328ffefba92d6c127917a2ba740f9cfe4a"
       url: "https://pub.dev"
     source: hosted
-    version: "0.5.1"
+    version: "1.1.1"
   webdriver:
     dependency: transitive
     description:
     source: hosted
     version: "3.0.3"
 sdks:
-  dart: ">=3.3.1 <4.0.0"
-  flutter: ">=3.18.0-18.0.pre.54"
+  dart: ">=3.5.0 <4.0.0"
+  flutter: ">=3.22.0"

lib/src/flutter_zsdk_method_channel.dart

 import 'package:flutter_zsdk/src/models/bluetooth_printer.dart';
 import 'package:flutter_zsdk/src/models/error_code.dart';
 import 'package:flutter_zsdk/src/models/flutter_zsdk_exception.dart';
+import 'package:location/location.dart' as loca;
+// import 'package:geolocator/geolocator.dart';
 import 'package:permission_handler/permission_handler.dart';
 
 import 'flutter_zsdk_platform_interface.dart';
           await FlutterBluePlus.turnOn();
         } on FlutterBluePlusException catch (e) {
           throw FlutterZsdkException(ErrorCode.turnOnBluetoothError, "Failed to turn on bluetooth: ${e.description}");
+        } catch (e) {
+          throw FlutterZsdkException(ErrorCode.turnOnBluetoothError, "Failed to turn on bluetooth");
         }
       } else {
         throw FlutterZsdkException(ErrorCode.bluetoothDisabled, "Bluetooth is not turned on on this device.");
       }
     }
 
+    // check location service
+    bool serviceEnabled = await loca.Location.instance.serviceEnabled();
+
+    if (!serviceEnabled) {
+      var serviceEnabled = await loca.Location.instance.requestService();
+      if (!serviceEnabled) {
+        throw FlutterZsdkException(ErrorCode.locationServiceDisabled, "This app require location service to scan bluetooth printers, please turn on location service first");
+      }
+    }
+    
+
     var bluetoothPermissionStatus = await Permission.bluetooth.status;
     var bluetoothConnectPermissionStatus = await Permission.bluetoothConnect.status;
     var bluetoothScanPermissionStatus = await Permission.bluetoothScan.status;
 
       if (permissionStatuses[Permission.bluetooth] == PermissionStatus.granted && permissionStatuses[Permission.bluetoothConnect] == PermissionStatus.granted && permissionStatuses[Permission.bluetoothScan] == PermissionStatus.granted && permissionStatuses[Permission.location] == PermissionStatus.granted) {
         return bluetoothDiscoveryEventChannel.receiveBroadcastStream();
+
+      } else if (permissionStatuses[Permission.bluetoothConnect] != PermissionStatus.granted && permissionStatuses[Permission.bluetoothScan] != PermissionStatus.granted) {
+        throw FlutterZsdkException(ErrorCode.nearbyDeviceAccessPermissionNotGranted, "Nearby device access permission not granted, please allow permission to discover bluetooth printers.");
+
+      } else if (permissionStatuses[Permission.bluetooth] != PermissionStatus.granted) {
+        throw FlutterZsdkException(ErrorCode.bluetoothPermissionDenied, "Bluetooth permission not granted, please allow permission to discover bluetooth printers.");
+
+      } else if (permissionStatuses[Permission.location] != PermissionStatus.granted) {
+        throw FlutterZsdkException(ErrorCode.locationPermissionDenied, "Location permission not granted, please allow permission to discover bluetooth printers.");
+
       } else {
         // throw Exception("Permissions not granted, please allow permission to discover bluetooth printers.");
         throw FlutterZsdkException(ErrorCode.permissionNotGranted, "Permissions not granted, please allow permission to discover bluetooth printers.");

lib/src/models/error_code.dart

 class ErrorCode {
   static const String permissionNotGranted = "PERMISSION_NOT_GRANTED";
+  static const String locationServiceDisabled = "LOCATION_SERVICE_DISABLED";
+
   static const String turnOnBluetoothError = "TURN_ON_BLUETOOTH_ERROR";
   static const String bluetoothIsNotSupported = "BLUETOOTH_IS_NOT_SUPPORTED";
   static const String bluetoothDisabled = "BLUETOOTH_DISABLED";
 
+  static const String bluetoothPermissionDenied = "BLUETOOTH_PERMISSION_DENIED";
+  static const String locationPermissionDenied = "LOCATION_PERMISSION_DENIED";
+  static const String nearbyDeviceAccessPermissionNotGranted = "NEARBY_DEVICE_ACCESS_PERMISSION_NOT_GRANTED";
+
   static const String discoveryError = "DISCOVERY_ERROR";
   static const String openConnectionError = "OPEN_CONNECTION_ERROR";
   static const String closeAndReopenConnectionError = "CLOSE_AND_REOPEN_CONNECTION_ERROR";

pubspec.yaml

 name: flutter_zsdk
 description: "A new Flutter plugin project."
 version: 0.0.1
-homepage:
+# homepage:
 
 environment:
   sdk: '>=3.3.1 <4.0.0'
 dependencies:
   flutter:
     sdk: flutter
-  plugin_platform_interface: ^2.0.2
-  permission_handler: ^11.3.1
+  plugin_platform_interface: 2.1.8
+  permission_handler: 11.3.1
   flutter_blue_plus: 1.34.5
+  location: 7.0.0
+  # geolocator: 9.0.2
+  # geolocator_android: 4.6.1
 
 dev_dependencies:
   flutter_test: