如何在Xamarin Android的通知徽章上设置动画

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">

    <ImageView
        android:id="@+id/app_icon"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/app_icon" />

    <ImageView
        android:id="@+id/badge"
        android:layout_width="20dp"
        android:layout_height="20dp"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:background="@drawable/badge_background" />

</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<animation-list xmlns:android="http://schemas.android.com/apk/res/android"
    android:oneshot="false">
    <item android:drawable="@drawable/badge_frame1" android:duration="100" />
    <item android:drawable="@drawable/badge_frame2" android:duration="100" />
    <!-- Add more frames as needed -->
</animation-list>

using Android.App;
using Android.Content;
using Android.Graphics;
using Android.OS;
using Android.Widget;

public class NotificationHelper
{
    public static void ShowAnimatedBadge(Context context)
    {
        var notificationManager = (NotificationManager)context.GetSystemService(Context.NotificationService);
        var channelId = "custom_notification_channel";
        var notificationBuilder = new Notification.Builder(context, channelId)
            .SetSmallIcon(Resource.Drawable.app_icon)
            .SetContentTitle("New Messages")
            .SetContentText("You have 5 new messages");

        // Inflate custom layout
        var remoteViews = new RemoteViews(context.PackageName, Resource.Layout.custom_notification_layout);
        
        // Set animation
        var animationDrawable = (AnimationDrawable)ContextCompat.GetDrawable(context, Resource.Drawable.badge_animation);
        remoteViews.SetImageViewBitmap(Resource.Id.badge, ((BitmapDrawable)animationDrawable.GetDrawable(0)).Bitmap);
        animationDrawable.Start();

        notificationBuilder.SetCustomContentView(remoteViews);

        // Create notification channel (required for Android O and above)
        if (Build.VERSION.SdkInt >= BuildVersionCodes.O)
        {
            var channel = new NotificationChannel(channelId, "Custom Channel", NotificationImportance.Default);
            notificationManager.CreateNotificationChannel(channel);
        }

        // Show notification
        var notification = notificationBuilder.Build();
        notificationManager.Notify(1, notification);
    }
}