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class BannerExampleState extends State<BannerExample> {
  BannerAd? _bannerAd;
  bool _isLoaded = false;

  // TODO: replace this test ad unit with your own ad unit.
  final adUnitId = Platform.isAndroid
    ? 'ca-app-pub-3940256099942544/6300978111'
    : 'ca-app-pub-3940256099942544/2934735716';

  /// Loads a banner ad.
  void loadAd() {
    _bannerAd = BannerAd(
      adUnitId: adUnitId,
      request: const AdRequest(),
      size: AdSize.banner,
      listener: BannerAdListener(
        // Called when an ad is successfully received.
        onAdLoaded: (ad) {
          debugPrint('$ad loaded.');
          setState(() {
            _isLoaded = true;
          });
        },
        // Called when an ad request failed.
        onAdFailedToLoad: (ad, err) {
          debugPrint('BannerAd failed to load: $error');
          // Dispose the ad here to free resources.
          ad.dispose();
        },
      ),
    )..load();
  }
}

final AdSize adSize = AdSize(300, 50);

class BannerExampleState extends State<BannerExample> {
  BannerAd? _bannerAd;
  bool _isLoaded = false;

  // TODO: replace this test ad unit with your own ad unit.
  final adUnitId = Platform.isAndroid
    ? 'ca-app-pub-3940256099942544/6300978111'
    : 'ca-app-pub-3940256099942544/2934735716';


  /// Loads a banner ad.
  void loadAd() {
    _bannerAd = BannerAd(
      adUnitId: adUnitId,
      request: const AdRequest(),
      size: AdSize.banner,
      listener: BannerAdListener(
        // Called when an ad is successfully received.
        onAdLoaded: (ad) {
          debugPrint('$ad loaded.');
          setState(() {
            _isLoaded = true;
          });
        },
        // Called when an ad request failed.
        onAdFailedToLoad: (ad, err) {
          debugPrint('BannerAd failed to load: $error');
          // Dispose the ad here to free resources.
          ad.dispose();
        },
        // Called when an ad opens an overlay that covers the screen.
        onAdOpened: (Ad ad) {},
        // Called when an ad removes an overlay that covers the screen.
        onAdClosed: (Ad ad) {},
        // Called when an impression occurs on the ad.
        onAdImpression: (Ad ad) {},
      ),
    )..load();
  }
}

...
if (_bannerAd != null) {
  Align(
    alignment: Alignment.bottomCenter,
    child: SafeArea(
      child: SizedBox(
        width: _bannerAd!.size.width.toDouble(),
        height: _bannerAd!.size.height.toDouble(),
        child: AdWidget(ad: _bannerAd!),
      ),
    ),
  )
}
...