User count (that will make the user offline even if the user close the app using the home button on their phone))

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#1

18.12.2021_10.04.36_REC
18.12.2021_10.04.36_REC1003×561 97 KB

hi im making user count (that will make the user offline even if the user close the app using the home button on their phone) but i dont know how to use after activity changed

#2

Show your firebase structure

#3

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#4