Android storage access?

Question

Android

Hello, tell me, I downloaded the application from the play market. The application has the ability to download files without providing access to the drive. After clicking "upload file" no permissions are required, it immediately goes to the file manager and offers to select a file. What does it mean?

Answer 1

this is Content Provider

Answer 2

private final ActivityResultLauncher<String> mGetContent = registerForActivityResult(new ActivityResultContracts.GetContent(), this::fileSelected);

mGetContent.launch("*/*");

It is done in 2 lines of code, it remains only in fileSelected() to write what to do with the received data.
It is considered safe, since the user himself in another application explicitly indicates what can be given to the application.