If using an activity, one can stop the application by calling qApp->quit();. However, if using a service, this will not properly work, and crash the service instead!

I tried using QtAndroid::androidService().callMethod<void>("stopSelf"); and it does indeed stop the service, but not the Qt thread, as it seems. Because if I try to start the service again, it fails with WARNING: QApplication was not created in the main() thread and tons of "already registered" warnings, and does not start.