Manage File and DocumentFile in a common wrapper class

This library is meant for local files only!

The new Storage Access Framework (SAF) introduced with android 5 does enforce you to be used on android 6. So when accessing local storages like internal storage and sd cards, you now have to differentiate between primary storage and secondary storage. You will be able to use the File class to access and modify files on the primary storage and you will have to get read/write permissions to access files on the secondary storage and use the DocumentFile class to access and modify files there.

Additionally, the MediaStore does still index primary and secondary storages and mix them. So you have to update it as well whenever you edit files on any storage.

This library addresses local files only, although SAF does offer access to online data as well. But this is out of the scope of this library, altough it should be extendable to support them as well. USB sticks would fit the scope of this library but are not addressed yet.

• General
• this library handles Files on the primary storage and DocumentFile on local secondary storages
• offers functions to get internal storage path and sd card path
• handle permissions for secondary storages - this library offers you the functions to gain, persist and check permissions that may be necessary for reading and modifying files
• Files
• offers wrapper class IFile that wraps a File (wrapped in StorageFile) or DocumentFile (wrapped in StorageDocument) and offers all the necessary functions to read or manipulate those wrapped files
• allows to create IFile from any path, the library will take care to create the correct IFile (depending on the location of the path you'll get a StorageFile or a StorageDocument)
• allows to copy, delete and move files, either on primary storage, secondary storage or even between them
• allows to efficiently make batch copies, batch deletes, batch moves => efficiently in the sense of that it is possible to call MediaStore updates in batch operations
• smartly selects best method for file modifications to keep as much data as possible (i.e. you can't set the lastModified date for a DocumentFile)
• MediaStore
• manages MediaStore automatically
• offers MediaStoreFileData and MediaStoreFolderData class that holds the data from the MediaStore and that can be loaded with the folders/files (if you need this data)
• updates the MediaStoreeffeciently
• Folder
• list folders on primary and secondary storage efficiently => loads folders with/-out content and with/-out MediaStore data
• load files in folder => load them with-/out MediaStoredata

• support for USB sticks
• handling of adding/removing storages
• retrieving permissions on demand instead of manually

TODO

There's a demo project that shows all the functions available with comments and everything is in one file! Read it to find out how this library works.