pusher_client/example/lib/main.dart

import 'dart:developer';

import 'package:flutter/material.dart';
import 'package:pusher_client/pusher_client.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  PusherClient pusher;
  Channel channel;

  @override
  void initState() {
    super.initState();

    String token = getToken();

    pusher = new PusherClient(
      "app-key",
      PusherOptions(
        // if local on android use 10.0.2.2
        host: 'localhost',
        encrypted: false,
        auth: PusherAuth(
          'http://example.com/broadcasting/auth',
          headers: {
            'Authorization': 'Bearer $token',
          },
        ),
      ),
      enableLogging: true,
    );

    channel = pusher.subscribe("private-orders");

    pusher.onConnectionStateChange((state) {
      log("previousState: ${state.previousState}, currentState: ${state.currentState}");
    });

    pusher.onConnectionError((error) {
      log("error: ${error.message}");
    });

    channel.bind('status-update', (event) {
      log(event.data);
    });

    channel.bind('order-filled', (event) {
      log("Order Filled Event" + event.data.toString());
    });
  }

  String getToken() => "super-secret-token";

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Example Pusher App'),
        ),
        body: Center(
            child: Column(
          children: [
            ElevatedButton(
              child: Text('Unsubscribe Private Orders'),
              onPressed: () {
                pusher.unsubscribe('private-orders');
              },
            ),
            ElevatedButton(
              child: Text('Unbind Status Update'),
              onPressed: () {
                channel.unbind('status-update');
              },
            ),
            ElevatedButton(
              child: Text('Unbind Order Filled'),
              onPressed: () {
                channel.unbind('order-filled');
              },
            ),
            ElevatedButton(
              child: Text('Bind Status Update'),
              onPressed: () {
                channel.bind('status-update', (PusherEvent event) {
                  log("Status Update Event" + event.data.toString());
                });
              },
            ),
            ElevatedButton(
              child: Text('Trigger Client Typing'),
              onPressed: () {
                channel.trigger('client-istyping', {'name': 'Bob'});
              },
            ),
          ],
        )),
      ),
    );
  }
}