Is internal storage safe from app developers accessing it?

[Android Central Question]

I read somewhere that apps with storage permissions can read SD card and unknown apps too. But somewhere it says that internal storage, the device storage cannot be accessed by app developers and it is private for the user. Also can a app permission only access what I got on default? Cause internal storage is set to default, not external.

 

[Rukbat]

1. Default storage is internal. Some apps might have settings allowing you to set them to store to the SD card, but android itself always uses internal storage.

2. All non-system storage is accessible to apps, as long as the particular folder, file, etc., has read permissions for user (the creator, which is the app that created it) and other. Some apps create folders with 'worldwide' permissions (read, write and execute for everyone), some limit them so much that you can't store anything in their folders using a different app.

"Is internal storage safe from app developers accessing it?" isn't a question that can be answered unless you can see the permissions for that folder. Some file managers can show permissions, or you can use a terminal app and use the ls -l command - rwx is read/write/execute permissions, the first group is user, the second is group, the third is other. The first letter for a folder is d for a directory, l for a link and - for a file.

 

[LJ Sal]

So you are saying for example that Kik app developer can access kik files saved on your phone that is inside kik folder but not all files on your phone? so apps who create their own folder can only access their folder?