How to disable shutdown and reboot from an app with system priviliges?

Question

I am developing a System App (i.e. an app signed with the device manufacturer's key) for non-rooted devices.

I need to prevent the user from shutting-down or rebooting the device.

If necessary and possible, disabling the power button completely would be a solution, though all I require is to be able to prevent the shut-down dialogue which appears when the power button is held-down.

Answer 1

You should be able to override the KeyEvent for this action, which is KEYCODE_POWER. See this post:

Power key event in android?

The important thing here is after you handle the KeyEvent you need to return true to let the system know that it has been handled.