Flutter Future vs bool type

You need to get the bool out of Future<bool>. Use can then block or await.

with then block

_checkConnection() {
  Utiliy.checkConnection().then((connectionResult) {
    Utility.showAlert(context, connectionResult ? "OK": "internet needed");
  })
}

with await

_checkConnection() async {
 bool connectionResult = await Utiliy.checkConnection();
 Utility.showAlert(context, connectionResult ? "OK": "internet needed");
}

For more details, refer here.