multi-upload from share menu

Hey!

My idea was to upload multiple files/photos (e.g. from QuickPic, or some file explorer). 
Currently Seafile only shows up in the share-menu, when i just select one file. I have managed it to change the code that i can upload multiple files.

I'll hope it'll be merged with the original, and then updated the application in the play store.

Best regards!
your code does not apply the format convention. 
please format your source code in order to be merged.
format goes like below
`if (some condition) {leave one space between parenthesis and curly brace} else if (else should placed on the same line with last curly brace, don not break line here) {also should add one space between parenthesis and curly brace}`