Event Channels in Flutter

Recently I was working on a product where I needed to stream data from native (Android / IOS ) to Flutter continuously. By MethodChannel, it is not possible—the Solution Event Channel.

Event Channel: A named channel for communicating with platform plugins using event streams.

EventChannel

First, we need to create Event channel and add events to it.

Android :

IOS :

We have two methods onListen(arg: Any?, sink: EventChannel.EventSink) where the first parameter is the argument, and then eventsink by which we will stream the data from native (Android / IOS ) and onCancel(arg: Any?)

Now we will stream the current time from native (Android / IOS ) to Flutter.

Android: Created Handler for continuous call of function and eventSink.success(data) will send back data to Flutter.

Full Code of MainActivity.kt Android:

IOS: Created Timer.scheduledTimer for continuous call of function and eventSink(data) will send back data to Flutter.

Full Code of AppDelegate.swift IOS:

Flutter main.dart :

First, we will create EventChannel with the same event name on the flutter side.

main.dart

Method to receive the data continuously from native to flutter.

main.dart

Displaying data from the stream.

Full Code main.dart Flutter

Complete Code: https://github.com/geek-atif/EventChannel

If you have any questions or suggestions, please leave them in the comments.

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