Can I know the PNG file which SplashScreen use in runtime?

I want to show a page with the same image as the SplashScreen shows, for show an input text and a button.

I need that the new page has the same backgroud as SplashScreen, so i need to know in Runtime, which file of /resources that is use by SplashScreen to configure it in --background: url(’…’).

¿It is possible? If it’s not possible, is there an algorithm to caclulate the exact filename?

Thank you!