Do Android homescreen widgets "know" when user returns to that
homescreen? Specifically, can a widget know (and use this knowledge)
when a user comes back to that homescreen after:
- unlocking the device
- swiping back from another homescreen
- completing a phone call
- closing an app
- closing a popup
- pressing dedicated home soft/hard button
- closing all-app list
etc

I want to update the content upon every return to homescreen.

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