OneSignal.dart

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

//import OneSignal
import 'package:onesignal/onesignal.dart';

void main() => runApp(new MyApp());

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

class _MyAppState extends State<MyApp> {
  String _debugLabelString = "";
  String _emailAddress;
  String _externalUserId;
  bool _enableConsentButton = true;

  // CHANGE THIS parameter to true if you want to test GDPR privacy consent
  bool _requireConsent = true;

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

  // Platform messages are asynchronous, so we initialize in an async method.
  Future<void> initPlatformState() async {
    if (!mounted) return;

    OneSignal.shared.setLogLevel(OSLogLevel.verbose, OSLogLevel.none);

    OneSignal.shared.setRequiresUserPrivacyConsent(_requireConsent);

    var settings = {
      OSiOSSettings.autoPrompt: false,
      OSiOSSettings.promptBeforeOpeningPushUrl: true
    };

    OneSignal.shared.setNotificationReceivedHandler((notification) {
      this.setState(() {
        _debugLabelString =
            "Received notification: \n${notification.jsonRepresentation().replaceAll("\\n", "\n")}";
      });
    });

    OneSignal.shared
        .setNotificationOpenedHandler((OSNotificationOpenedResult result) {
      this.setState(() {
        _debugLabelString =
            "Opened notification: \n${result.notification.jsonRepresentation().replaceAll("\\n", "\n")}";
      });
    });

    OneSignal.shared
        .setSubscriptionObserver((OSSubscriptionStateChanges changes) {
      print("SUBSCRIPTION STATE CHANGED: ${changes.jsonRepresentation()}");
    });

    OneSignal.shared.setPermissionObserver((OSPermissionStateChanges changes) {
      print("PERMISSION STATE CHANGED: ${changes.jsonRepresentation()}");
    });

    OneSignal.shared.setEmailSubscriptionObserver(
        (OSEmailSubscriptionStateChanges changes) {
      print("EMAIL SUBSCRIPTION STATE CHANGED ${changes.jsonRepresentation()}");
    });

    // NOTE: Replace with your own app ID from https://www.onesignal.com
    await OneSignal.shared
        .init("YOUR APP ID", iOSSettings: settings);

    OneSignal.shared
        .setInFocusDisplayType(OSNotificationDisplayType.notification);

    bool requiresConsent = await OneSignal.shared.requiresUserPrivacyConsent();

    this.setState(() {
      _enableConsentButton = requiresConsent;
    });
  }

  void _handlePromptForPushPermission() {
    print("Prompting for Permission");
    OneSignal.shared.promptUserForPushNotificationPermission().then((accepted) {
      print("Accepted permission: $accepted");
    });
  }

  void _handleGetPermissionSubscriptionState() {
    print("Getting permissionSubscriptionState");
    OneSignal.shared.getPermissionSubscriptionState().then((status) {
      this.setState(() {
        _debugLabelString = status.jsonRepresentation();
      });
    });
  }

  void _handleSendNotification() async {
    var status = await OneSignal.shared.getPermissionSubscriptionState();

    var playerId = status.subscriptionStatus.userId;

    var imgUrlString =
        "http://cdn1-www.dogtime.com/assets/uploads/gallery/30-impossibly-cute-puppies/impossibly-cute-puppy-2.jpg";

    var notification = OSCreateNotification(
        playerIds: [playerId],
        content: "this is a test from OneSignal's Flutter SDK",
        heading: "Test Notification",
        iosAttachments: {"id1": imgUrlString},
        bigPicture: imgUrlString,
        buttons: [
          OSActionButton(text: "test1", id: "id1"),
          OSActionButton(text: "test2", id: "id2")
        ]);

    var response = await OneSignal.shared.postNotification(notification);

    this.setState(() {
      _debugLabelString = "Sent notification with response: $response";
    });
  }

  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      home: new Scaffold(
          appBar: new AppBar(
            title: const Text('Flutter and OneSignal'),
          ),
          body: Container(
            padding: EdgeInsets.all(10.0),
            child: SingleChildScrollView(
              child: new Table(
                children: [
                  new TableRow(children: [
                    new OneSignalButton("Prompt for Push Permission",
                        _handlePromptForPushPermission, !_enableConsentButton)
                  ]),
                  new TableRow(children: [
                    new OneSignalButton(
                        "Print Permission Subscription State",
                        _handleGetPermissionSubscriptionState,
                        !_enableConsentButton)
                  ]),
                  new TableRow(children: [
                    Container(
                      height: 8.0,
                    )
                  ]),
                  new TableRow(children: [
                    new OneSignalButton("Post Notification",
                        _handleSendNotification, !_enableConsentButton)
                  ]),
                  new TableRow(children: [
                    new Container(
                      child: new Text(_debugLabelString),
                      alignment: Alignment.center,
                    )
                  ]),
                ],
              ),
            ),
          )),
    );
  }
}

typedef void OnButtonPressed();

class OneSignalButton extends StatefulWidget {
  final String title;
  final OnButtonPressed onPressed;
  final bool enabled;

  OneSignalButton(this.title, this.onPressed, this.enabled);

  State<StatefulWidget> createState() => new OneSignalButtonState();
}

class OneSignalButtonState extends State<OneSignalButton> {
  @override
  Widget build(BuildContext context) {
    return Table(
      children: [
        TableRow(children: [
          RaisedButton.icon(
            color: Colors.lightBlue,
            icon: Icon(Icons.notifications),
            textColor: Colors.white,
            label: Text(widget.title),
            onPressed: widget.enabled ? widget.onPressed : null,
          )
        ]),
        TableRow(children: [
          Container(
            height: 8.0,
          )
        ]),
      ],
    );
  }
}