Question

我已将admob广告添加到我的应用中。现在我想从xaml页面发送广告单元ID。

我已经像这样实现了它。

创建自定义控件

using Xamarin.Forms;

namespace MeetupManager.Controls
{
    public class AdControlView : View
    {
    }
}

添加视图渲染器

using Android.Widget;
using Android.Gms.Ads;
using Xamarin.Forms;
using Xamarin.Forms.Platform.Android;

[assembly: ExportRenderer(typeof(MeetupManager.Controls.AdControlView), typeof(MeetupManager.Droid.PlatformSpecific.AdViewRenderer))]
namespace MeetupManager.Droid.PlatformSpecific
{
    public class AdViewRenderer : ViewRenderer<Controls.AdControlView, AdView>
    {
        string adUnitId = string.Empty;
        //Note you may want to adjust this, see further down.
        AdSize adSize = AdSize.SmartBanner;
        AdView adView;
        AdView CreateNativeAdControl()
        {
            if (adView != null)
                return adView;

            // This is a string in the Resources/values/strings.xml that I added or you can modify it here. This comes from admob and contains a / in it
            adUnitId = Forms.Context.Resources.GetString(Resource.String.banner_ad_unit_id);
            adView = new AdView(Forms.Context);
            adView.AdSize = adSize;
            adView.AdUnitId = adUnitId;

            var adParams = new LinearLayout.LayoutParams(LayoutParams.WrapContent, LayoutParams.WrapContent);

            adView.LayoutParameters = adParams;

            adView.LoadAd(new AdRequest
                            .Builder()
                            .Build());
            return adView;
        }

        protected override void OnElementChanged(ElementChangedEventArgs<Controls.AdControlView> e)
        {
            base.OnElementChanged(e);
            if(Control == null)
            {
                CreateNativeAdControl();
                SetNativeControl(adView);
            }
        }
    }
}

更新MainActivity

MobileAds.Initialize(ApplicationContext, "YOUR APP ID HERE FROM AdMob, has a ~ in it");

更新XAML

首先添加自定义xmlns名称空间：

xmlns:controls="clr-namespace:MeetupManager.Controls;assembly=MeetupManager"

然后添加自定义控件

<Grid RowSpacing="0">
      <Grid.RowDefinitions>
          <RowDefinition Height="*"/>
          <RowDefinition Height="Auto"/>
      </Grid.RowDefinitions>
      <ListView Grid.Row="0"/>
      <controls:AdView Grid.Row="1"/>
  </Grid>

这是我在Xamarin.Forms: Google AdMob Ads in Android

后面的教程

效果很好。现在我想要的是从xaml发送广告单元ID。像这样的东西。

<controls:AdView Grid.Row="1" AdUnitId="testid"/>

我应该怎么做呢？

Answer 1

您应该在自定义控件中添加一个属性，如下所示：

using Xamarin.Forms;

namespace MeetupManager.Controls
{
    public class AdControlView : View
    {
        public static readonly BindableProperty AdUnitIdProperty =
        BindableProperty.Create(propertyName: nameof(AdUnitId),
              returnType: typeof(string),
              declaringType: typeof(AdControlView ),
              defaultValue: "");


        public string AdUnitId
        {
            get { return GetValue(AdUnitIdProperty).ToString(); }
            set { SetValue(AdUnitIdProperty, value); }
        }
    }
}

并在您的视图渲染器中

using Android.Widget;
using Android.Gms.Ads;
using Xamarin.Forms;
using Xamarin.Forms.Platform.Android;

[assembly: ExportRenderer(typeof(MeetupManager.Controls.AdControlView), typeof(MeetupManager.Droid.PlatformSpecific.AdViewRenderer))]
namespace MeetupManager.Droid.PlatformSpecific
{
    public class AdViewRenderer : ViewRenderer<Controls.AdControlView, AdView>
    {
        //Note you may want to adjust this, see further down.
        AdSize adSize = AdSize.SmartBanner;
        AdView adView;
        //*********HERE'S THE CHANGE**********
        AdView CreateNativeAdControl(string adUnitId)
        {
            if (adView != null)
            return adView;            
            adView = new AdView(Forms.Context);
            adView.AdSize = adSize;
            adView.AdUnitId = adUnitId;

            var adParams = new LinearLayout.LayoutParams(LayoutParams.WrapContent, LayoutParams.WrapContent);

            adView.LayoutParameters = adParams;

            adView.LoadAd(new AdRequest
                        .Builder()
                        .Build());
            return adView;
        }

        protected override void OnElementChanged(ElementChangedEventArgs<Controls.AdControlView> e)
        {
            base.OnElementChanged(e);
            if(Control == null)
            {
                if (!String.IsNullOrEmpty(((AdControlView)Element).AdUnitId))
                {
                    string adUnitId = ((AdControlView)Element).AdUnitId;
                    CreateNativeAdControl(adUnitId);
                    SetNativeControl(adView);
                }                    
            }
        }
    }
}

在xaml中传递广告单元ID以呈现admob广告

1 个答案: