initialize static method

Implementation

static Future<void> initialize() async {
  final result = await _connectivity.checkConnectivity();
  isConnected = !result.contains(ConnectivityResult.none);
  _controller.add(isConnected);

  _connectivity.onConnectivityChanged.listen((results) {
    isConnected = !results.contains(ConnectivityResult.none);
    _controller.add(isConnected);
  });
}