Check if app resumed from memory

Check if app resumed from memory

I'm wondering if there is a way to see if the application is resumed from
memory?
I need to do download a file upon startup, but I don't want to use the
onResume() because then it will be triggered when going back in stack
aswell.
Only when the app is resumed from e.g. the home screen.
Have anybody done anything similar?
Best regards / Henric