close method
Implementation
@override
void close() async {
  if (Hive.isBoxOpen(_boxName)) {
    Box<String> box = await Hive.box(_boxName);
    var v = await box.close();
    return v;
    //return await Hive.box(_boxName).close();
  }
}@override
void close() async {
  if (Hive.isBoxOpen(_boxName)) {
    Box<String> box = await Hive.box(_boxName);
    var v = await box.close();
    return v;
    //return await Hive.box(_boxName).close();
  }
}