Firebase push notification - Android users send notification [closed] - android

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I am a new learner on android development. So that I want to know some information related to FCM. I have looked at many sites questions and tutorial, I saw, how android users receive notification from Firebase which send by manual. The think I want is, how android user send the notification message to Firebase and Firebase continue to spread or push the notification received from the user to other users? (Any idea or tutorial or another QA related)
Thank you very much!

If you want to send user to user messages you have 2 ways
you need server side
you can use cloud firebase function and realtime database
https://firebase.google.com/docs/functions/
there you can write your server side code

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Sending notification to a specific user based on realtime database data (Android) [closed]

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I have a firebase realtime database like this:
I want to send a user notification if userState changes from 0 to 1.
the thing is userState is changed by another phone or device and the app might not be open on the phone we are trying to change its userState, so I cant use EventListener.
how can I do this? is there any tutorial I can follow?
You can send a notification using PHP files (with server side) check this link
Or you can send them from android to android (without server side) check this link

How to send notification to specific user at specific time [closed]

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I am developing an Android application with backend laravel, how to push notification to a specific user with a specific time using API?
Also, I found firebase and pusher, so which is better to implement my requirements and how to start?
If you want to implement your own approach, basically you have to create a db table which keeps subscribe id's or tokens for each user using your application. This tokens can be taken from Firebase with like this. Then, you will be able to send notification via using this tokens from your server.
You can review here for more.

How can I get the number of online users now in my app [closed]

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is there any website to get online users now in my app or any good idea?
I tried to using onStart and onDestory but do not work well Are there other ideas
Best way is to use Socket for more accurate data
This way your server-side and mobile app can maintain real-time comms, which can be used in more than just tracking who is online you can even track in which activity they users are.
if you want something with less code you can use fabric KPI which can track alot more things like content view - Search - share -Rated content - etc.
NOTE
google bought fabric and right now they are working on migrating all of fabric features to their firebase service.

Chat application in Android using Parse Server [closed]

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I have to develop an Android chat application and i have Parse Server as a backend.
I read documentations about Live Query it can do the job for real-time tasks, but this solution is only available for iOS.
Is there a way to use Live Queries for Android or should i use another solution with Parse Server such as Firebase ?
You can combine Parse Server and PubNub. When A wants to send a message to B, A save that message to Parse then you write cloud code in afterSave Triggers to publish the message to B via PubNub.

Where is the C2DM Source Code? [closed]

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Anyone know if the C2DM source code is open? If so, where is it located?
Just to be clear, I'm not interested in any client code to connect to C2DM, and I'm not interested in any server code to push notifications to C2DM. I'm actually interested in the source of the C2DM service itself (the service that's running in the cloud, which handles coordination / registration between clients and application servers).
C2DM is closed source, However if you want to build a push service consider using XMPP. Use OpenFire XMPP Server and aSmack for implementing Push Notification.
It is not open source AFAIK, just as most Google services are not open source AFAIK.

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