protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
SetContentView(Resource.Layout.Main);
//Creates webview with interface and load ad-ready HTML
webView = FindViewById <WebView>(Resource.Id.webView);
webView.Settings.JavaScriptEnabled = true;
webView.AddJavascriptInterface(new NativeWebviewJSInterface(this), "app_interface");
webView.LoadUrl("file:///android_asset/Webview.html");
//Load NativeAd and associate to listener that comunicates with HTML
AdLoader.Builder adBuilder = new AdLoader.Builder(ApplicationContext, "ca-app-pub-3940256099942544/2247696110"); //SAMPLE AD UNIT ID
adBuilder.ForContentAd(new NativeAdContentListener(this, webView));
adBuilder.Build().LoadAd(new AdRequest.Builder().AddTestDevice(AdRequest.DeviceIdEmulator).Build());
}