DEPRECATED: This version of the app is no longer maintained, get the Pro version at https://play.google.com/store/apps/details?id=com.simplemobiletools.filemanager.pro . It is free till Nov 12 2018. If you download it till then, you will be able to use it for free forever.
Can also be used for browsing root files and SD card content. You can easily rename, copy, move, delete and share anything you wish.
The fingerprint permission is needed for locking either hidden item visibility, or the whole app.
Contains no ads or unnecessary permissions. It is fully opensource, provides customizable colors.
This app is just one piece of a bigger series of apps. You can find the rest of them at http://www.simplemobiletools.com