su vs system-app ( for shutdown / reboot -p )

Question

I want to shutdown one android device via code. I can do so with

su reboot -p

But now I want to do this with my app that is signed with the system key without the need for rooting the device - but strangely I get:

reboot: Operation not permitted

Anyone can point me in the right direction

Answer 1

Don't use a su command. Use Android's native methods. PowerManager has a method reboot() as documented here: Android doc

Full code example here

Hope this helps