Admob interstitial ads for Fuse

Admob.uno

using Fuse;
using Fuse.Scripting;
using Fuse.Reactive;
using Uno.UX;

[UXGlobalModule]
public class Admob : NativeModule
{
  static readonly Admob _instance;
  public Android.InterstitialAdPage ad;

  public Admob()
  {
    if (_instance != null) return;

    _instance = this;
    Resource.SetGlobalKey(_instance, "Admob");
    AddMember(new NativeFunction("displayInterstitialAd", (NativeCallback)displayInterstitialAd));
    this.ad = new Android.InterstitialAdPage();
  }

  public object displayInterstitialAd(Context c, object[] args)
  {
    this.ad.displayAd();
    return null;
  }
}

namespace Android {
  using Uno.Compiler.ExportTargetInterop;
  
  [Require("Gradle.Dependency.Compile", "com.google.gms:google-services:3.0.0")]
  [Require("Gradle.Dependency.Compile", "com.google.firebase:firebase-ads:10.0.1")]
  [ForeignInclude(Language.Java, "com.google.android.gms.ads.AdRequest")]
  [ForeignInclude(Language.Java, "com.google.android.gms.ads.InterstitialAd")]
  [ForeignInclude(Language.Java, "com.google.android.gms.ads.MobileAds")]
  [ForeignInclude(Language.Java, "com.fuse.Activity")]
  public extern(Android) class InterstitialAdPage
  {
    public Java.Object iAd;

    public InterstitialAdPage()
    {
      initialize();
      requestNewInterstitial();
    }

    [Foreign(Language.Java)]
    public void requestNewInterstitial()
    @{
      final InterstitialAd mInterstitialAd = new InterstitialAd(Activity.getRootActivity());
      mInterstitialAd.setAdUnitId("[****AdUnitID****]");

      final AdRequest adRequest = new AdRequest.Builder()
        .addTestDevice("[****TestDeviceID****]")
        .build();

      Activity.getRootActivity().runOnUiThread(new Runnable() {
        @Override
        public void run() {
          mInterstitialAd.loadAd(adRequest);
        }
      });

      @{InterstitialAdPage:Of(_this).iAd:Set(mInterstitialAd)};
    @}

    [Foreign(Language.Java)]
    public void displayAd()
    @{
      Object ad = @{InterstitialAdPage:Of(_this).iAd:Get()};
      final InterstitialAd intAd = (InterstitialAd)ad;

      Activity.getRootActivity().runOnUiThread(new Runnable() {
        @Override
        public void run() {
          if (intAd.isLoaded()) {
            intAd.show();
          }
        }
      });

      @{InterstitialAdPage:Of(_this).requestNewInterstitial():Call()};
    @}

    [Foreign(Language.Java)]
    static void initialize()
    @{
      MobileAds.initialize(Activity.getRootActivity(), "[****AppID****]");
    @}
  }

  public extern(!Android) class InterstitialAdPage
  {
    public InterstitialAdPage() {}
    public void displayAd() {}
  }
}

MyComponentScript.js

import Admob from 'Admob'

Admob.displayInterstitialAd()