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I have a flutter application Linked with backend (php/my SQL) ,I need when user add new item in specific page in app send notification to all users . so how can i do this?
The best way is to use the Firebase!
Fire base is maintained by Google, just like Flutter and they're being made to work together!
Try the https://pub.dev/packages/firebase_messaging (Firebase Messaging).
It's free in most case scenario, and you can add a lot of cool things with other firebase plugins.
See more at https://github.com/flutter/plugins/blob/master/FlutterFire.md
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This is user collection
I want get contact and show to the user only the contacts which is in firebase like Whatsapp
There is an excellent documentation for that in Firebase docs.
Check the docs
Example for your collection can be
Firestore.instance.collection("users").get()
Remember its good practice to paginate large collection, from my perspective it seems your collection is going to be large. Pagination
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I don't know how to do this when the app is closed. How do I tell the app that this specific user is calling even when the app is killed and not open.
You have to use PushKit's VoIP notifications in order to be able to receive calls using CallKit. Unfortunately, Firebase doesn't support VoIP pushes.
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I have recently made a page on itch.io, I am wondering how I would be able to prevent people from copying the files and sending it instead of paying the $20. In other words, I want to make sure that the person who tries to run the launcher / installer has purchased the game from itch.io
What you can do is the same as mojang, create yourgameaccount#gmail.com and yourgameusertag. That way you can prevent maybe. Try to do like minecraft where you require registered account to play the game.
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I don't want to have users login or anything, so how would I capture and sort their data to firebase?
Is there anyway to code and have the app recognize people by their device?
Firebase provides an anonymous login feature. You can read more about it here:
https://firebase.google.com/docs/auth/ios/anonymous-auth
Also, if you choose to include a sign in feature later, you can convert the anonymous account into a permanent account while keeping their data.
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I want Making an application that works with FireBase.The application will be like this .
User profiles will be.
You can add friends.
You can uploads max 20 seconds videos.
How can i do this ?
Thanks for your interest.
I would recommend taking a look at these links
https://firebase.google.com/docs/database/
https://firebase.google.com/docs/storage/
Firebase has very good tutorials in getting you started with their database.
Good luck :)