Warns and notifications while using app

i trying make a system that an administrator create warn and notifications that the normal users see, this system is being make with firebase database. So when the user logs in, the app will check the firebase and if the firebase have a new warn or notification, so the new warning will appear on the screen for the user. But i don't know how get new warn and show it into the screen. Help me pls!!

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this will help, thanks!

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