I've recently switched from an iOS to android device and I just found that apparently the feature that I loved the most in Adobe Reader for iOS is unavailable in the Android version: Folder view in the Local menu.
I used this app mainly to read work related documents, and the folder structure is fundamental in order to navigate efficiently and reach the desired documents, but now Local has everything listed there, and distinguishing the folder hierarchy is a real pain. I've decided to change pdf viewers for the time being, but I'must sure plenty of people would love to have the option to:
1.- Change to Folder view in local
2.- Set a default folder for Folder view
I hope this helps you in developing a better app
I am sorry for the inconvenience caused, however in Android devices PDF's are listed under the local tab according to the folder hierarchy.
There is no way to set the default view folder or change the folder view.
If you have to change the PDF location you will have to use file-manager in your device to relocate the PDF files.