video call acceptance screen with Agora flutter

Question

I'm trying to build a video calling app with Agora, I need to show acceptance screen like WhatsApp when user calling, if the app is exited i need to show calling screen when user is calling, I tried lot of thing but nothing works, I trying to do i flutter and but there is nothing much information on this,Please help me

Solution

First things first. You need to learn about some concepts before delving into your solution. Actually there isn't an out of the box solution.

You need to use a couple of things together:

• Use push notifications to "wake up" your app:
  https://pub.dev/packages/firebase_messaging
  To start your app using push notifications refers to this post:
  https://stackoverflow.com/a/48405551/4335775
  
  
• Use CallKit (IOS) or ConnectionServices (Android) to show the upcoming call screen. By the day of this answer there are only a few packages to handle these things, here is one that can handle both platforms:
  https://pub.dev/packages/flutter_callkeep

If you want a completely different thing and need to run some background process, there are bunch whole of things you should know first.
I suggest beginning here: https://flutter.dev/docs/development/packages-and-plugins/background-processes

Here is a usefull package to work with background processes that should be constantly running:
https://pub.dev/packages/background_fetch

Currently there are two packages which provides integration for agora.io:

• https://pub.dev/packages/agora_rtc_engine (for Agora Real Time Communication, vídeo call included)
• https://pub.dev/packages/agora_rtm for real-time messaging

I hope this can help you.