How to work with Internal storage?

Question

Android

I have found many examples on how to get list of files and folders on sd card. And if the phone does not support flash drives, for example LG nexus 5, then how to get to the data stored on the phone? I can get to system folders and files using this construct:

File f = new File("/");
File[] files = f.listFiles();

And I can’t figure out how to get to user files.

Answer 1

in android there is a special folder in which user folders, a flash card or usb otg are mounted, its name is "mnt".
Look at what folders are there, in my emulator there is only "sdcard" (/mnt/sdcard/)
On my tablet I have a whole bunch of folders there: aces, secure, shell ... and sdcard, sdcard2, cd-rom, usbotg. This is in theory, but to work with it:
working with files
storing data

Answer 2

If the phone does not support sd cards, this does not mean that it does not have external storage.
And what you call user data is not clear.