In my app, I am taking image and audio file from internal storage

Question

In my app, I am getting an image and audio file from internal storage. It works fine in micromax funbook tab 4.2.2 (jellybean) but when I tried to run the same apk in Nexus 7 it doesn't work.

This is my code internroot=

Environment.getExternalStorageDirectory().getPath()+"/AmritaLeveledReader/"+Frag+"/books/book/book_"+position;