title: load file from asset whit subfolders
body: <p>I have some problems while loading the file from the asset folder.
  I wrote a code to load a txt file into a textview and everything works good.
  If I try to put some order inside my txt file. I decided to put those files in subfolders in alphabetic order, because I have 800 text files. In this way my code is wrong. Is there a method to maintain the subfolders and load the file whitout specify where they are??
  Thanks a lot</p>