.dart

  @override
  void initState() {
    FirebaseAdMob.instance.initialize(appId: BannerAd.testAdUnitId);
    //Change appId With Admob Id
    _bannerAd = createBannerAd()
      ..load()
      ..show();
    super.initState();
  }

  @override
  void dispose() {
    _bannerAd.dispose();
    _interstitialAd.dispose();
    super.dispose();
  }