xamarin形式的admob横幅广告未显示

Question

我过去7星期一直在研究这个问题，但是我不知道为什么广告没有显示。我见过很多人在Google上发布了同样的问题，但是似乎没人知道如何解决它……好像xamarim需要简单的东西并使它变得复杂。无论如何，尽管我应该在stackoverflow上寻求帮助

我使用的代码是默认的xamarin.forms代码，可以在以下网站上找到：click here

issue：当我运行此代码时，广告未显示。

在测试设备上，它工作正常。此代码在这里没有问题

//Test Device
var requestbuilder = new AdRequest.Builder().AddTestDevice(testDeviceID);

但是在生产设备上，广告没有显示

  //Production Device
  var requestbuilder = new AdRequest.Builder();

在日志中，您会收到以下消息：

I/Ads     ( 4131): Ad failed to load : 3
D/Mono    ( 4131): DllImport searching in: 'libmono-native.so' ('./libmono-native.so').
 D/Mono    ( 4131): Searching for 'SystemNative_CopyFile'.
 D/Mono    ( 4131): Probing 'SystemNative_CopyFile'.
 D/Mono    ( 4131): Found as 'SystemNative_CopyFile'.

---

完整代码：

AndroidManifiedt.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="2" android:versionName="2.0" package="com.wolfTech.discount_calculator" android:installLocation="auto">
<uses-sdk android:minSdkVersion="21" android:targetSdkVersion="28" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET" />

<application android:label="Discount_Calculator.Android">
    <meta-data android:name="com.google.android.gms.ads.APPLICATION_ID" 
           android:value="ca-app-pub-76543245678567~1212345354" />
    <activity android:name="com.google.android.gms.ads.AdActivity" 
          android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize" 
          android:theme="@android:style/Theme.Translucent" />
</application>

MainPage.xaml

<ContentPage ...>
    <StackLayout>
     <Controls:AdControlview Size="Standardbanner" VerticalOptions="EndAndExpand"  />
</StackLayout>
</ContentPage>

AdControlview.cs

namespace Discount_Calculator.Controls
{
    public class AdControlview : Xamarin.Forms.View
{
    public enum Sizes { Standardbanner, LargeBanner, MediumRectangle, FullBanner, Leaderboard, SmartBannerPortrait }

    public Sizes Size { get; set; }

    public AdControlview()
    {
        this.BackgroundColor = Color.Accent;
    }
}

}

AdViewRenderer.cs

   [assembly: ExportRenderer(typeof(AdControlview), typeof(AdViewRenderer))]
namespace Discount_Calculator.Droid.Helper
 {
    public class AdViewRenderer : ViewRenderer
      {
    Context context;

    string testDeviceID = "0F92232223232323230BBC9";
    string myAdUnitId = "ca-app-pub-442332323323320/92223323232321";

    public AdViewRenderer(Context _context) : base(_context)
    {
        context = _context;
    }

    protected override void OnElementChanged(ElementChangedEventArgs<View> e)
    {
        base.OnElementChanged(e);

        if (e.OldElement == null)
        {
            var adView = new AdView(Context);
           var MyAdHeight = 50;
            switch ((Element as AdControlview).Size)
            {
                case AdControlview.Sizes.Standardbanner:
                    adView.AdSize = AdSize.Banner;
                    MyAdHeight = 50;
                    break;
                case AdControlview.Sizes.LargeBanner:
                    adView.AdSize = AdSize.LargeBanner;
                    MyAdHeight = 100;
                    break;
                case AdControlview.Sizes.MediumRectangle:
                    adView.AdSize = AdSize.MediumRectangle;
                    MyAdHeight = 250;
                    break;
                case AdControlview.Sizes.FullBanner:
                    adView.AdSize = AdSize.FullBanner;
                   MyAdHeight = 60;
                    break;
                case AdControlview.Sizes.Leaderboard:
                    adView.AdSize = AdSize.Leaderboard;
                   MyAdHeight = 90;
                    break;
                case AdControlview.Sizes.SmartBannerPortrait:
                    adView.AdSize = AdSize.SmartBanner;
                    break;
                default:
                    adView.AdSize = AdSize.Banner;
                    break;
            }

            // TODO: change this id to your admob id  
            adView.AdUnitId = myAdUnitId;

            //Test Device
            //var requestbuilder = new AdRequest.Builder().AddTestDevice(testDeviceID);

            //Production Device
            var requestbuilder = new AdRequest.Builder();

            e.NewElement.HeightRequest = MyAdHeight;
            adView.LoadAd(requestbuilder.Build());
            SetNativeControl(adView);

        }//end of if
    }//end of OnElementChanged
}//end of class
}  //end of name  

这是我的项目结构：

Answer 1

由于某种原因，现在它的工作了。我什么也没做