如何使用媒体插件在Xamarin.Forms中实现摄像头覆盖的依赖服务？

public interface ICameraService
{
    Task<byte[]> TakePhoto();
}

[assembly: Dependency(typeof(CameraService))]
namespace YourNamespace.Droid
{
    public class CameraService : ICameraService
    {
        public async Task<byte[]> TakePhoto()
        {
            // 使用媒体插件访问摄像头并拍照
            var photo = await CrossMedia.Current.TakePhotoAsync(new StoreCameraMediaOptions());

            // 将照片转换为字节数组
            byte[] photoBytes = null;
            using (var memoryStream = new MemoryStream())
            {
                photo.GetStream().CopyTo(memoryStream);
                photoBytes = memoryStream.ToArray();
            }

            // 返回照片的字节数组
            return photoBytes;
        }
    }
}

private async Task TakePhoto()
{
    var cameraService = DependencyService.Get<ICameraService>();
    var photoBytes = await cameraService.TakePhoto();

    // 处理照片字节数组，例如显示在界面上或上传到服务器
}