<SOLVED> How to use QGuiApplication::applicationStateChanged in normal application

[cszawisza]

I'm creating an application for android device, and I want to use android activities "signals" (onPause etc.). I read that I can use QGuiApplication::applicationStateChanged() signal to check my application state, but I don't know how (and if it's possible) to use this signal in 'normal' QApplication app, not QML. Or maybe if there is some other way of getting those signals in my application?