How can i get all files in a specific folder in android?

I've tried with a listfile:

1. load Filelist: PublicStorageDirectory( "Android object", "Pictures")
--> output is empty.

2. load Directory List: PublicStorageDirectory( "Android object", "Pictures")
--> output is one line with just: "Pictures"

i want to create a list with all images within a folder. but it seems i'm doing something wrong here.
(btw permission write external storage is set)

FOR EVERYONE WHO'S RUNNING INTO THE SAME PROBLEM, HERE'S THE SOLUTION, USE:

PublicStorageDirectory( "Android object", "Pictures")+"\"