Apps Open image from internal

[Radu Bogdan Claudiu]

Hi boys,
I'm using VS 2015 Android Native so it's the same as Android Studio only Syntax changing cause i'm using C# and you Java.

I'm trying to show an image from internal storage to ImageView

       var itemURL = Android.Net.Uri.Parse("content://com.android.providers.media.documents/document/image:20421");
                var input = context.ContentResolver.OpenInputStream(itemURL);
                convertView.FindViewById<ImageView>(Resource.Id.Galleria_Menu_ImgLast).SetImageBitmap(BitmapFactory.DecodeStream(input));

The error is telling me that i must grant Manifest.Permission.ManageDocuments permission, that I've granted in manifest file.

before calling that function I have used

     if (ContextCompat.CheckSelfPermission(this, Manifest.Permission.ManageDocuments) != Permission.Granted)
            {
                if (ActivityCompat.ShouldShowRequestPermissionRationale(this, Manifest.Permission.ManageDocuments))
                {

                }
                else
                {
                    ActivityCompat.RequestPermissions(this, new string[] { Manifest.Permission.ManageDocuments }, 198);
                }
            }

and on requestpermissionresult that handle the result

  public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Permission[] grantResults)
        {
            base.OnRequestPermissionsResult(requestCode, permissions, grantResults);
            switch (requestCode)
            {
                case 198:
                    {
                        // If request is cancelled, the result arrays are empty.
                        if (grantResults.Length > 0 && grantResults[0] == Permission.Granted)
                        {

                            // permission was granted, yay! Do the
                            // contacts-related task you need to do.


                            FillList();
                        }
                        else
                        {

                            // permission denied, boo! Disable the
                            // functionality that depends on this permission.
                        }
                        break;
                    }

                    // other 'case' lines to check for other
                    // permissions this app might request
            }
        }

The problem is the grantResult array is populated with permission.Deny.

1) I've looked at Application permissions in settings-> application-> App Name-> permissions and is granted..#

please help me..
The URI is correct and image exists...

 

[Unforgiven]

I moved this here for better exposure.

 

[Radu Bogdan Claudiu]

One think that I want to add is :
First i SAVE content URI to database and i want to show image on later access.
the scenario is NOT:
open content then immediately show on imageview
the scenario is:
open content and save the path in my database then show image on later access.