如何在Xamarin.Forms的通知图标中添加任意数字

using Android.App;
using Android.Content;
using Android.Graphics;
using Android.OS;
using Android.Support.V4.App;

namespace YourNamespace.Droid
{
    public static class NotificationHelper
    {
        public static void ShowNotification(Context context, string title, string message, int number)
        {
            var notificationManager = NotificationManagerCompat.From(context);

            var channelId = "your_channel_id"; // 自定义通知渠道ID
            var channelName = "Your Channel Name"; // 自定义通知渠道名称

            if (Build.VERSION.SdkInt >= BuildVersionCodes.O)
            {
                var importance = NotificationImportance.Default;
                var channel = new NotificationChannel(channelId, channelName, importance);
                notificationManager.CreateNotificationChannel(channel);
            }

            var intent = new Intent(context, typeof(MainActivity)); // 替换为你的主Activity
            intent.SetFlags(ActivityFlags.ClearTop | ActivityFlags.SingleTop);
            var pendingIntent = PendingIntent.GetActivity(context, 0, intent, PendingIntentFlags.UpdateCurrent);

            var builder = new NotificationCompat.Builder(context, channelId)
                .SetContentTitle(title)
                .SetContentText(message)
                .SetSmallIcon(Resource.Drawable.your_icon) // 替换为你的图标资源
                .SetLargeIcon(BitmapFactory.DecodeResource(context.Resources, Resource.Drawable.your_icon)) // 替换为你的图标资源
                .SetNumber(number)
                .SetAutoCancel(true)
                .SetContentIntent(pendingIntent);

            var notification = builder.Build();
            notificationManager.Notify(0, notification);
        }
    }
}

using Xamarin.Forms;

namespace YourNamespace
{
    public partial class MainPage : ContentPage
    {
        public MainPage()
        {
            InitializeComponent();
        }

        private void ShowNotificationButton_Clicked(object sender, EventArgs e)
        {
            var title = "Notification Title";
            var message = "Notification Message";
            var number = 42; // 替换为你想要显示的数字

            DependencyService.Get<INotificationService>().ShowNotification(title, message, number);
        }
    }
}

[assembly: UsesPermission(Android.Manifest.Permission.Vibrate)]
[assembly: UsesPermission(Android.Manifest.Permission.WakeLock)]
[assembly: Application(Icon = "@drawable/your_icon")]