I'm using SignalR for push notifications on my Flutter app and that works ok. I get the message from the backend and show notification using flutter_local_notifications. The problem is that the SignalR service would shut down after some time. How can I make my app stay on in the background? and even start on reboot?
Here's my code:
import 'dart:async';
import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:isolate_test/Model/UserMessageModel.dart';
import 'package:signalr_core/signalr_core.dart';
import 'EndPointService.dart';
import 'NotificationService.dart';
class SignalRProvider {
static String appName = "NOTIFICATION";
static String? userName = "";
static String deviceName = "android_app";
static List<UserMessageModel> messages = <UserMessageModel>[];
HubConnection connection = HubConnectionBuilder()
.withUrl(
'my_url',
HttpConnectionOptions(
logging: (level, message) => print(message),
))
.withAutomaticReconnect()
.withHubProtocol(JsonHubProtocol())
.build();
Function(bool update)? onMessagesUpdateCallback;
SignalRProvider({
this.onMessagesUpdateCallback,
});
setUsername(String username) {
userName = username;
}
Future initSignalR(BuildContext context) async {
WidgetsFlutterBinding.ensureInitialized();
await NotificationService().init();
connection.on('SignalRUserReceiveMessage', (message) async {
var data = message!.first;
if (data != null) {
UserMessageModel msg = UserMessageModel.fromJson(data);
messages.add(msg);
msg.showNotification();
}
if (onMessagesUpdateCallback != null) {
onMessagesUpdateCallback!(true);
}
});
connection.on('SignalRMonitoringMessage', (message) async {
var data = message!.first;
if (data != null) {
UserMessageModel msg = UserMessageModel.fromJson(data);
messages.add(msg);
msg.showNotification();
}
if (onMessagesUpdateCallback != null) {
onMessagesUpdateCallback!(true);
}
});
connection.on("SignalRReceiveConnectedMessage", (message) async {
await connection.send(methodName: 'SignalRInit', args: [
userName,
appName,
connection.connectionId,
]);
});
connection.on("SignalRReceiveDisconnectedMessage", (message) async {
if (connection.state == HubConnectionState.disconnected) {
connection.start();
}
});
await connection.start();
}
List<UserMessageModel> getMessages() {
return messages;
}
Future deleteMessage(UserMessageModel _msg) async {
if (_msg == null) return;
var response =
await EndPointService().SetupApi("Message", "", []).httpDelete(
HeaderEnum.BasicHeaderEnum,
ResponseEnum.ResponseModelEnum,
jsonEncode(_msg),
);
}
addOrUpdateMessage(UserMessageModel _msg) {
if (_msg == null) return;
if (messages != null) {
var found =
messages.firstWhere((e) => e.user == _msg.user && e.id == _msg.id);
var index =
messages.indexWhere((e) => e.user == _msg.user && e.id == _msg.id);
if (found != null) {
messages[index] = _msg;
} else {
messages.add(_msg);
}
if (onMessagesUpdateCallback != null) {
onMessagesUpdateCallback!(true);
}
}
}
setMessagesUpdateCallback(Function(bool update) func) {
onMessagesUpdateCallback = func;
}
}
