android - Open Specific Directory Using Storage Access Framework -

i'm able obtain file uri opening lollipop file picker using code below:

            intent intent = new intent();             intent.setaction(intent.action_open_document_tree);             startactivity(intent); 

the file picker opens either @ root of internal storage or last directory opened. how can make file picker show contents of specific directory? example, might want file picker show contents of download folder after launching in picture below.