Trying to make very simple logic for timer | Doesnt work

I want to make very simple logic with Clock but it doesn’t work, can someone help ?

When I click Label1 I’m enabling Timer to true with timer interval to 8000 ( 8 Seconds ) After 8 Seconds if I don’t get back, Timer should fire and show image. If I get back before 8 seconds, Image should not be showed On App Resume. This should work but it’s not and timer never fires

After using the StartActivity method the other app does have the control and not your app anymore… you can’t bring back your app anymore like this…