Android Question How to know when an activity is called by Android and not by another activity

Hi, Ive added fingerprint security to my app. It works ok in Activity Create.
What I want is, if the user changes from my app to another app and the gets back to ask for fingerprint again, but not if the user goes back to the activity from another activity of the app.
Ive tried in Resupe and Stops but no luck.
Thanks