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我正在尝试使用 xamarin 在图像视图中显示图像，但是当我按下相机中的接受按钮时，它不会返回到我的主要活动。

这是代码

protected override void OnCreate (Bundle bundle)
{
    base.OnCreate (bundle);
    SetContentView (Resource.Layout.AddPurchase);
    // Create your application here

    ConfigLayout ();
    if (IsThereAnAppToTakePictures ()) 
    {           
        CreateDirectoryForPictures ();
        Button cameraButton = FindViewById<Button> (Resource.Id.buttonTakePicture);
        _imageView = FindViewById<ImageView> (Resource.Id.imageView);
        cameraButton.Click += TakeAPicture;
    }
}

protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
{
    base.OnActivityResult(requestCode, resultCode, data);
    Intent mediaScanIntent = new Intent (Intent.ActionMediaScannerScanFile);
                var contentUri = Uri.FromFile (_file);
                mediaScanIntent.SetData (contentUri);
                SendBroadcast (mediaScanIntent);
                int height = _imageView.Height;
                int width = _imageView.Width;

                using (Bitmap bitmap = _file.Path.LoadAndResizeBitmap(width, height)) {
                    _imageView.SetImageBitmap (bitmap);
                }
}
bool IsThereAnAppToTakePictures ()
{
        Intent intent = new Intent (MediaStore.ActionImageCapture);
        IList<ResolveInfo> availableActivities = PackageManager.QueryIntentActivities (intent, PackageInfoFlags.MatchDefaultOnly);
        return availableActivities != null && availableActivities.Count > 0;
    }

void CreateDirectoryForPictures ()
    {
        _dir = new File (Environment.GetExternalStoragePublicDirectory (Environment.DirectoryPictures), "Boekhoudservice");
        if(!_dir.Exists ())
            _dir.Mkdirs();
    }

private void TakeAPicture(object sender, System.EventArgs eventArgs)
    {
        if (_imageView.Drawable != null) {
            _imageView.SetImageResource (0);
        }
        Intent intent = new Intent (MediaStore.ActionImageCapture);

        _file = new Java.IO.File(_dir, String.Format ("uitgave_{0}.jpg", System.DateTime.Now.ToString ("d")));
        intent.PutExtra (MediaStore.ExtraOutput, Uri.FromFile(_file));

        StartActivityForResult (intent, RequestCodeConstants.CameraIntent);

    }

似乎问题出在我的目录创建方法上，在检查目录是否存在时，它会返回 true，而如果我自己检查，它不会出现在我的文件资源管理器中。

这两个权限都在我的 AndroidManifest 中

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