Permissions for file access under 25_android

Write file: FileOutputStream fos = context. Openfileoutput ("Private.txt", Context.mode_privatr), parameter 1 file name, parameter 2 permission mode.

File permissions under the Linux system.

Position 0-Representative file
D Stands for Directory
Under normal circumstances, every application under Android is a standalone user with a separate group.
Position Current User R readable W writable x executable
Position 4~6 Current user's group R readable W writable x executable
Location 7~9 permissions of other users

----------0 000
0 000 000 000

-rw-------0 600
0 110 000 000 because 110 corresponds to a decimal that is 6, the permission is 600

-Rw-rw-rw-0 666

Modify Permissions command: chmod full name: Change mode

Permissions for file access under 25_android