Permissions

NFC Ring Unlock requires a lot of permissions, this is why:

SYSTEM_ALERT_WINDOW - Draw lockscreen
WRITE_EXTERNAL_STORAGE <-- for db export
READ_EXTERNAL_STORAGE <-- for db export
GET_ACCOUNTS <-- get possible email fallback options
INTERNET <-- verification
VIBRATE <-- to vibrate
MANAGE_ACCOUNTS <-- to check if user signed in correctly with gmail
USE_CREDENTIALS <-- could honestly be removed. was related to some old stuff we wanted to do but never finished.
READ_PHONE_STATE <-- check internet connection
NFC <-- for nfc
RECEIVE_BOOT_COMPLETED <-- to detect when the phone starts
CAMERA <-- To take pictures of the ring you assigned as a key