problem_check_system/lib/data/providers/connectivity_provider.dart

// lib/data/providers/connectivity_provider.dart
import 'dart:async';
import 'package:connectivity_plus/connectivity_plus.dart';
import 'package:get/get.dart';
import 'package:flutter/material.dart';

class ConnectivityProvider extends GetxService {
  final Connectivity _connectivity = Connectivity();
  final RxBool isOnline = false.obs;
  late StreamSubscription<List<ConnectivityResult>> _connectivitySubscription;

  @override
  void onInit() {
    super.onInit();
    _initConnectivityListener();
  }

  @override
  void onClose() {
    _connectivitySubscription.cancel();
    super.onClose();
  }

  Future<void> _initConnectivityListener() async {
    _connectivitySubscription = _connectivity.onConnectivityChanged.listen((
      results,
    ) {
      final isConnected = results.any(
        (result) =>
            result == ConnectivityResult.mobile ||
            result == ConnectivityResult.wifi ||
            result == ConnectivityResult.ethernet,
      );
      isOnline.value = isConnected;
      if (isConnected) {
        Get.snackbar(
          '网络状态',
          '已连接到网络',
          colorText: Colors.white,
          backgroundColor: Colors.green,
          snackPosition: SnackPosition.TOP,
        );
      } else {
        Get.snackbar(
          '网络状态',
          '已断开网络连接',
          colorText: Colors.white,
          backgroundColor: Colors.red,
          snackPosition: SnackPosition.TOP,
        );
      }
    });

    final initialResults = await _connectivity.checkConnectivity();
    isOnline.value = initialResults.any(
      (result) =>
          result == ConnectivityResult.mobile ||
          result == ConnectivityResult.wifi ||
          result == ConnectivityResult.ethernet,
    );
  }
}