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How to control whether to display notification or not based on the screen that is being displayed in android studio?

I am making a chat application and I am using Firebase Cloud Messaging to send push notifications. Everything is working fine but I do not want to display notification if the app is already in chat screen. I am using jetpack compose for UI and have single-activity architecture.
So in my chat screen, I don't want to display the notification. However, if the user is at other screens, I want to display the notification.
How can I achieve this?

There can be two possible solutions
Declare boolean in Activity or SharedPreference and toggle value according to lifecycle event's.
Once you receive firebase notification send broadcast and listen in activity. Inside activity identify top most visible screen using navController like below and decide wheather to show notification or not.
val visibleScreenRoute = parentNavController.currentBackStackEntry?.destination?.route?.split(Constants.KEY_QUESTION_MARK)?.getOrNull(0)
Hope this will help you to solve the issue.

I have the same case as you.
First, you need to create a custom notification and control push notifications manually.
Second, you have a module which checks whether activity is displaying or not.
Finally, when you receive notification data from firebase, using above module to decide display notification or not.
Check this document for more details : Build Notification

Is there a way to control app icon shortcut badge count in a react-native android application?

Actually the thing I want to achieve is, normally the shortcut icon badge count in android got cleared once the push notification popup is acknowledged by an user from notification panel, but instead clearing the count as above it has to be cleared only after the corresponding notification is acknowledged by an user within the app(for eg: if an user received a text message then the badge count will increased to one and once the user cleared the push notification popup form notification panel then the badge will also got cleared, but instead of that badge should be cleared only after the user viewed the message).
I tried the following packages.
https://www.npmjs.com/package/react-native-app-badge
https://www.npmjs.com/package/react-native-android-badge

Looks like you can use ShortcutBadge.setCount(0); to clear the badge counter!
I dont know what you use to display a notification on the android device itself, probably react-native-push-notification.
If that's the case, they also have a function for it:
PushNotification.setApplicationIconBadgeNumber(0)
You just need to run one of these functions when the event of a dismissed notification triggers, which may or may not need some java coding for achieve it!

Show only notification with multi application when call push from server

I created two applications and installed them on a device. Both apps have the same notification id. Whenever I send a push notification from my service, two notification show up.
I want to show only one notification (instead of displaying the same notification twice). Can I do it? If so then how can I do it?

You can use a shared preferences between the two apps and write a value when some app show the notification. Then just before to show it you should check the shared preferences to know if the other application has shown the notification or not. Even you can add delay in one of the applications giving preference to the other one.

In Android how do I get the currently displayed notification for a given notification id?

My intention is to display a notification with a personalised icon. However, if a notification with the same id is already displayed and then I need to add a new notification with the same id, my program will instead prepare a "stacked" version of the notification where the icon is changed to some generic icon and the notification content shows excerpts from the last and current notifications. Similar to how Gmail does when there are multiple emails.
To implement that I need to check if there are notifications of my app, currently displayed. I do not see any API to retrieve my own notifications.
I cannot simply cache the notification details that I have displayed till now, since in that case I need to know when they will be dismissed by the user, and update my cache accordingly. I also do not see any API to listen for dismiss events.

If you observe the gmail app notification behaviour properly u will notice that even when u dismiss one notification gmail shows you the same notification again in the list when a new notification comes. It looks to me that gmail is relying on total unread/unopened messages rather than keeping a cache of notifications.
There is no direct api for ur suggested SDK version. You need to fallback to ur own implementation. However, there is a way to know if a already showed notification was dismissed - How to know when my notification is cleared via Clear button?

This is possible with android 4.3 upwards now
See http://developer.android.com/reference/android/service/notification/NotificationListenerService.html#getActiveNotifications()

Expanding a notification from the notification bar

Is it possible to make a notification expand on click? For example, by clicking on the notification it would bring up a listview with more options.
In the app I'm working on, a user has many files. Each time the app is opened a notification is issued with the number of files that have been modified. Is there any way to click on this notification so I can see a sub-list of each file?
I could do this by registering an intent with a ListActivity, but is there a cleaner way to do it?
Thanks!