ad.dart

@override
void onGameOver(int correctAnswers) {
  showDialog(
    context: _scaffoldKey.currentContext,
    builder: (context) {
      return AlertDialog(
        title: Text('Game over!'),
        content: Text('Score: $correctAnswers/5'),
        actions: <Widget>[
          FlatButton(
            child: Text('close'.toUpperCase()),
            onPressed: () {
              
              // TODO: Display an Interstitial Ad
              if (_isInterstitialAdReady) {
                _interstitialAd.show();
              }

              _moveToHome();
            },
          ),
        ],
      );
    },
  );
}