Question: I have an Android project homework. I added some location and sensor information of the user to Firebase Databese via the service. What I want

I have an Android project homework.
I added some location and sensor information of the user to Firebase Databese via the service.
What I want to do is to send a notification to the user when a certain value in the databese changes.
how should I write code for this?

(Kotlin or Java please)

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