64 lines
1.6 KiB
Dart
64 lines
1.6 KiB
Dart
import 'dart:async';
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import 'package:connectivity_plus/connectivity_plus.dart';
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import 'package:flutter/foundation.dart' show kIsWeb;
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/// Observes network reachability and exposes online/offline transitions.
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class ConnectivityService {
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ConnectivityService({Connectivity? connectivity})
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: _connectivity = connectivity ?? Connectivity();
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final Connectivity _connectivity;
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final StreamController<bool> _onlineController =
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StreamController<bool>.broadcast();
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StreamSubscription<List<ConnectivityResult>>? _subscription;
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bool _isOnline = true;
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Stream<bool> get onlineChanges => _onlineController.stream;
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bool get isOnline => _isOnline;
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Future<void> initialize() async {
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if (kIsWeb) {
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_isOnline = true;
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_onlineController.add(true);
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return;
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}
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final List<ConnectivityResult> results = await _connectivity
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.checkConnectivity();
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_emitOnline(_resultsOnline(results));
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_subscription = _connectivity.onConnectivityChanged.listen(
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(List<ConnectivityResult> results) => _emitOnline(_resultsOnline(results)),
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);
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}
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void dispose() {
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_subscription?.cancel();
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_onlineController.close();
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}
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bool _resultsOnline(List<ConnectivityResult> results) {
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if (results.isEmpty) {
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return false;
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}
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return results.any(
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(ConnectivityResult r) =>
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r == ConnectivityResult.mobile ||
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r == ConnectivityResult.wifi ||
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r == ConnectivityResult.ethernet ||
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r == ConnectivityResult.vpn,
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);
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}
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void _emitOnline(bool online) {
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if (_isOnline == online) {
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return;
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}
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_isOnline = online;
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_onlineController.add(online);
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}
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}
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