My question is plain and simple. Can an app keep onto its root access permissions after the phone is turned off? Is there a way an app with root access can keep this permission and start running with this permission without asking for it again once the device is turned back on?
If so, how?
The user would have to tell the superuser app not to ask again for the dialog not to be shown, but you'll always have to request su in the shell process you create regardless.