show method
Implementation
Future<void> show() async {
_channel.invokeMethod('show');
var result = await _eventListener.waitFor([
_CallbackName.onAdShown,
_CallbackName.onAdFailedToShow,
]);
if (result['name'] == _CallbackName.onAdFailedToShow.name) {
throw AdShowError(result['code'], result['description']);
}
}