Android Question System Key Signing

[Martin Beukes]

Greetings all,

I am developing an app that will run on a specific device. I need to sign with the system key so that the app is able to shut down the device. If at any point other signatures are needed, this will be done on a per device basis.

Is this possible with b4a? How exactly?

Thanks,
Martin

 

[Peter Simpson]

What do you mean by system key, do you mean something like an NFC Tag?

If so then yes it's definitely possible as I've done it for one of my clients a couple of years ago, here is the NFC Tag tutorial from Erel.

https://www.b4x.com/android/forum/threads/nfc-reading-and-writing.64451/#content

This is only for NFC Tags and nothing else.

Shutting down the device is another matter, locking the app until the correct details are detected is aa simpl enough task to do though.

 

[Martin Beukes]

Signing with the System key makes the app seen as system and so it can directly shut down the device. This is something I seriously need to do. As far as I can find out, even a kiosk app that is device owner can do this.

 

[Peter Simpson]

Oh that...

Take a look at this kiosk code from erel.

https://www.b4x.com/android/forum/threads/device-owner-tasklock-kiosk-apps-2017.81765/

 

[Martin Beukes]

Thanks Peter, the kiosk is already all set up. I need it to be able to shutdown the tablet withoyr user interaction.

 

[DonManfred]

I guess it is not possible unless the Device is rooted.