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Implement FirebaseMessaging.onMessage for foreground alerts and FirebaseMessaging.onMessageOpenedApp for taps when the app is in background or terminated. A common pitfall is forgetting to set android:launchMode="singleTop" in AndroidManifest.xml, causing duplicate screens on tap.
Create a simple UI that shows the latest notification title and body in a card. Test by sending messages with different payloads; ensure the UI updates instantly when the app is open and navigates correctly when tapped from the system tray.
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