Display banner on Flutter

Step 1: Display AdropBannerView

class YourComponentState extends State<YourComponent> {
  
  final unitId = "";
  bool isLoaded = false;
  AdropBannerView? bannerView;

  @override
  void initState() {
    super.initState();

    bannerView = AdropBannerView(
      unitId: getUnitId(),
      listener: AdropBannerListener(
        onAdReceived: (unitId) {
          setState(() {
            isLoaded = true;
          });
        },
        onAdFailedToReceive: (unitId, error) {
          setState(() {
            isLoaded = false;
          });
        },
      ),
    );
    bannerView!.load();
  }
  
  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        TextButton(
            onPressed: () {
              bannerManager.load(unitId);
            },
            child: const Text('Reload Ad!')),
        bannerView != null && isLoaded ?
          SizedBox(
              width: screenWidth,
              height: 80,
              child: bannerView) : Container(),
      ],
    );
  }
}

Dispose AdropBannerView

AdropBannerView must be disposed of when access to it is no longer needed.

@override
void dispose() {
  super.dispose();
  bannerView?.dispose();
}