Xamarin.Forms Google Services AdMob - xamarin.forms

Question

I'm trying to implement AdMob in my Xamarin.Forms app (Android version for now). Here is what I have done so far:
Created a custom control, AdViewControl, in my shared project:
public class AdControlView : Xamarin.Forms.View
{
}
In my page in which to show the ad, I added the custom control in xaml:
xmlns:ads="clr-namespace:MyFeelingBuddyTwo.Views"
<ads:AdControlView BackgroundColor="Red"/>
In the Android project (AndroidManifest.xml), within :
<meta-data
android:name="com.google.android.gms.ads.APPLICATION_ID"
android:value="ca-app-pub-myappid"/>
<activity android:name="com.google.android.gms.ads.AdActivity"
android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize"/>
In the Android project still, I created an AdViewRenderer:
[assembly: ExportRenderer(typeof(MyFeelingBuddyTwo.Views.AdControlView), typeof(AdViewRenderer))]
namespace MyFeelingBuddyTwo.Droid
{
class AdViewRenderer : ViewRenderer<Views.AdControlView, AdView>
{
string adUnitId = "myadunitid";
AdSize adSize = AdSize.SmartBanner;
AdView adView;
AdView CreateAdView()
{
if (adView != null)
return adView;
adView = new AdView(Forms.Context);
adView.AdSize = adSize;
adView.AdUnitId = adUnitId;
var arParams = new LinearLayout.LayoutParams(LayoutParams.WrapContent, LayoutParams.WrapContent);
adView.LayoutParameters = arParams;
adView.LoadAd(new AdRequest.Builder().Build());
return adView;
}
protected override void OnElementChanged(ElementChangedEventArgs<AdControlView> e)
{
base.OnElementChanged(e);
if(Control == null)
{
CreateAdView();
SetNativeControl(adView);
}
}
}
}
In MainActivity, intialize MobileAds just before loading the app:
MobileAds.Initialize(ApplicationContext, "ca-app-pub-appid");
When I run, I get the red background but no ads are loaded. Any ideas?

Answer 1

In the AdControlView class, I added :
public static readonly BindableProperty AdUnitIdProperty = BindableProperty.Create("AdUnitId", typeof(string), typeof(AdControlView));
public string AdUnitId
{
get { return (string)GetValue(AdUnitIdProperty); }
set { SetValue(AdUnitIdProperty, value); }
}
Now I can see "Test Ad" in the banner placeholder.