我怎样才能在不去xamarin表单上的画廊的情况下拍摄实时照片？

<uses-permission android:name="android.permission.CAMERA" />

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

[assembly: Dependency(typeof(CameraService))]
namespace YourNamespace.Droid
{
    public class CameraService : ICameraService
    {
        public async Task<byte[]> TakePhotoAsync()
        {
            // 创建一个Camera实例
            var camera = Android.Hardware.Camera.Open();

            // 设置相机参数
            var parameters = camera.GetParameters();
            parameters.PictureFormat = ImageFormatType.Jpeg;
            camera.SetParameters(parameters);

            // 拍照
            camera.StartPreview();
            await Task.Delay(1000); // 等待相机准备
            camera.TakePicture(null, null, new PictureCallback());

            // 等待照片被拍摄
            await Task.Delay(2000);

            // 获取照片数据
            byte[] photoData = PictureCallback.PhotoData;

            // 释放相机资源
            camera.StopPreview();
            camera.Release();

            return photoData;
        }
    }

    public class PictureCallback : Java.Lang.Object, Android.Hardware.Camera.IPictureCallback
    {
        public static byte[] PhotoData { get; private set; }

        public void OnPictureTaken(byte[] data, Android.Hardware.Camera camera)
        {
            PhotoData = data;
        }
    }
}

private async void TakePhotoButton_Clicked(object sender, EventArgs e)
{
    var cameraService = DependencyService.Get<ICameraService>();
    byte[] photoData = await cameraService.TakePhotoAsync();

    // 处理照片数据，例如保存到本地或上传到服务器
}