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Set Firebase Notification to appear as Popup like whatsapp in Android studio

I am building an social media app in Android studio, this app uses firebase for push notifications, and notifications is working fine, that Is notifications shows on device's notification bar.
How can I change the behavior so that the notification can appear as popup when app is in foreground?
I want a persistent kind of notification, something like WhatsApp that can stay on top other apps so that users can quickly open notification on wherever they are on their phone.
On my research, the best i could get was to use this on my theme
But I do not have Theme.Holo.Dialog in my style and my aim is that the notification should appear even if app is not open.
Thank you for looking into this

You should use heads-up notifications
For this purposes you should use notification channel with high a importance: How to set importance in the notification channel.
In this answer you can find code sample, how to show notification in the channel with high importance(to show notification even if the app in the foreground):
https://stackoverflow.com/a/67953864/16210149
Hope it would be helpful.

Strange allow/deny question on Huawei 5.1 phone when showing notification

So it turns out that Huawei phones with 5.1 can't display MediaStyle notifications so while fixing that, I made a very simple notification test and I get a strange question asking Allow App Name to push messages to the notification panel.
I don't use push in any way, in fact the screenshot below is for an app that all it does is show a sample notification, nothing else.
How can I make it not show that?
This is the code:
Notification notification = new Notification.Builder(getApplicationContext())
.setSmallIcon(R.drawable.ic_launcher_background)
.setContentTitle("Track title")
.setContentText("Artist - Album")
.setOngoing(true)
.addAction(R.drawable.ic_add_black_24dp, "fwd", pi)
.addAction(R.drawable.ic_android_black_24dp, "fwd", pi)
.addAction(R.drawable.ic_archive_black_24dp, "fwd", pi)
.addAction(R.drawable.ic_arrow_back_black_24dp, "fwd", pi)
.addAction(R.drawable.ic_aspect_ratio_black_24dp, "fwd", pi)
.addAction(R.drawable.ic_fast_forward_black_24dp, "fwd", pi)
.setLargeIcon(BitmapFactory.decodeResource(getResources(), R.drawable.vectors_525058875))
.setAutoCancel(false)
.build();
notificationManager.notify(300, notification);
This is the screenshot.
What am I doing wrong? I tried taking out all the actions, that didn't help. Took out title and context, that didn't help. Took out large icon, auto cancel, ongoing, etc, didn't help.
Please note that I am not using Push in any way and this doesn't seem to be related to that. Also I a using the support compat libraries to make my notification but on this example I didn't just to make sure that wasn't the issue.

Huawei's version of the Android OS has a custom feature that tries to spot apps doing annoying numbers of notifications.
Don't focus on the word "push". It doesn't mean "push notifications" in the technical sense of coming from the internet. It just is a verb, they could have said "allow app to create notifications" or "allow app to cause notifications" it's the same meaning.
Anyway, this is an OS feature, there is nothing you can do to avoid it except make sure you aren't spammy with your notifications. Unfortunately during development and testing you will often be triggering a lot of notifications, and the OS will detect your app is spammy. Don't worry about it. As long as your app works well for normal users it shouldn't happen.

It's Huawei customized Android OS feature. Long story short, you can't disable it.
I saw it a lot when I test my app. Huawei OS thinks your notification might annoy the end user(yourself, in this case) because it happened a lot.
You don't have to concern it😀

Your use deprecated constructor. Your must specify channel. Like this:
Notification.Builder builder = new NotificationCompat.Builder(context,"MyPerfectApplication")
Otherwise you use unknown chanel, possible you try to push in system channel.

it's indeed a custom check of EMUI, which enables the user to decide whether or not to have these custom notifications being pushed into the default notification channel, before a single one of these notifications had ever been displayed, when the first push is being attempted. it generally controls the notification settings of your app on Huawei devices, from within that notification panel. system & vendor applications are permitted to push notifications by default and therefore it won't ever ask the user for a double confirmation there. this has nothing to do with excessive notifications, because it is a precondition to even have these notifications pushed, no matter the amount.

Silent notifications in foreground services

I have multiple apps that kind of work together to do the same job and they all belong to the same developer. Each app runs a long-running service in the background and keeps processing user's input. The problem is that those services cannot run in the background for a long time because Android system will kill them. So I want to use foreground services instead of background ones to prevent the system from killing them. However, I don't want to annoy the users with multiple different notifications in the notification drawer.
I found out that creating a notification without assigning a channel in Android O, will let the system start the foreground service without showing a notification. Something like the following:
Notification.Builder builder = new Notification.Builder(context);
builder.setContentTitle(......);
builder.setTicker(......);
builder.setContentText(......);
builder.setSmallIcon(......);
builder.setLargeIcon(......);
Notification notification = builder.build();
startForeground(111, notification);
So I was thinking of showing a notification by creating a notification with a channel from one app and create a notification without a channel for the other apps as I described earlier. In that case, the user will see one notification for all my apps.
That solution works well for me. But I am wondering if it is an unintended use of the notification in the foreground services. I am afraid that Google will suspend my apps for doing that!!
Do you guys know if it is okay to implement that solution?
Or is there any way to stack the notifications together in a group even though they are different apps?
My goal is just to make the notification less annoying to the user.
Also, I am aware of JobScheduler & JobIntentService solutions. But they don't do the job in my case because I want to keep the service running. Not like do one job and stop the service...

You can create notification channel with IMPORTANCE_LOW (https://developer.android.com/training/notify-user/channels#importance).
There shouldn't be sound.
Or you can also use setOnlyAlertOnce() (https://developer.android.com/training/notify-user/build-notification#Updating) and the sound will be only once.

Android Wear: Programmatically stop my app's notifications from appearing on watch

From reading about wearable-notifications documentation, it doesn't seem possible to programmatically stop my app's notifications from appearing on the connected wearable device. I can add an my app to 'muted' apps' list using the Android Wear app on the handheld; however, I would like to do this using code. Please let me know if you've figured this out.
Additionally, is it possible to show a completely different notification on the phone and on the wearable, instead of just having a different set of notification actions on the wearable?
Thank you for your responses!

Using setLocalOnly(true), it is possible to display the notification only on phone. This, in effect, programmatically mutes your app - your app's notifications do not appear on the connected devices.
To create completely different notifications for phone and wearable, we can write a companion wearable app that displays the custom notification. The phone notification is then stopped from appearing on wearable using setLocalOnly(). I haven't tried the 'stacking' mentioned by Maciej Ciemięga yet.
(Added this as an answer for the benefit of those who might miss the comments on the accepted answer.)

First question:
I'm afraid muting apps from code is not possible.
Second question:
It is possible to show different notifications on phone and watch.
You can do it by implementing a wearable application and show local (setLocalOnly()) notifications separately on watch and phone (+ sync them with the phone using DataApi).
Alternatively you can make use of group feature of Android Wear framework. It's basically created to post many (grouped) notifications on wearable device and one summary notification on phone. But using this mechanism you can also post one (summary) notification on your phone and second notification only on wear.
final NotificationManagerCompat notificationManager = NotificationManagerCompat.from(this);
// This notification will be shown only on phone
final NotificationCompat.Builder phoneNotificationBuilder = new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.ic_launcher)
.setContentTitle("Title phone")
.setContentText("Text phone")
.setGroup("GROUP")
.setGroupSummary(true);
// This notification will be shown only on watch
final NotificationCompat.Builder wearableNotificationBuilder = new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.ic_launcher)
.setContentTitle("Title wearable")
.setContentText("Text wearable")
.setGroup("GROUP")
.setGroupSummary(false);
notificationManager.notify(0, phoneNotificationBuilder.build());
notificationManager.notify(1, wearableNotificationBuilder.build());
This way you can create "stack" with one notification only (+ summary notification of course). The stack with one notification will appear only on watch and the summary notification will appear only on phone - so this is what you want to achieve:)
Please read more about grouping (stacking) notifications here:
https://developer.android.com/training/wearables/notifications/stacks.html

Android notification like Skype Application

I'm writing an application for my Android phone. The application has a background service. I want to display that service in the notification area like Skype application does.
If I use NotificationManager and Notification (the way android samples do), the result is different.
See this image
My notification is the one called "Service".
The Skype service has an icon just above the notification area. Skype has also "normal notifications". These "normal notifications" appear below my notification.
I want my service to be above the notification area like Skype application is. Does anyone know how to do that?
Thanks in advance.

Take a look at
http://developer.android.com/reference/android/app/Notification.html#FLAG_ONGOING_EVENT
Also look at
Android: How to create an "Ongoing" notification?
and
http://developer.android.com/guide/topics/ui/notifiers/notifications.html