Enable Google Analytics for all Flutter platforms: Android, iOS, macOS, Web, Windows, and Linux.

The official Flutter plugin for Firebase Analytics (which uses Google Analytics behind the scenes) works with 4 platforms (Android, iOS, macOS, and Web). For Windows and Linux, there's no out-of-the-box support.

Ambilytics Flutter plugin solves this issue by enabling Google Analytics 4 (GA4) Measurement Protocol for unsupported platforms (Windows and Linux) and creating a unified interface that abstracts away interaction with 2 different analytics backends:

Google/Firebase Analytics
- You enable and configure it for any of the required platforms (Android, iOS, macOS, Web)
- Note: as of July 2023 macOS is in Beta and may be displayed as iOS platform in Firebase/Google Analytics consoles, choose proper Data Stream name for it in GA console
GA4 Measurement Protocol
- You create a separate Web stream to track events sent from Windows/Linux

By creating Firebase project, configuring Google Analytics account, importing the package (and optionally setting navigation observer) you get the capability to send standard and custom events to Google Analytics and see data in Reports.

Product analytics made easy (and ambient).

Features

Unified analytics interface for all Flutter platforms
Seamless interaction with Firebase Analytics and GA4 Measurement Protocol
Automatic app start and screen view event tracking
- app_start custom event is sent during initialization, platform parameter contains name of the platform
- When AmbilyticsObserver is configured screen_view is sent on Firebase platforms along with screen_view_cust via Measurement Protocol (either for all platforms or only Windows/Linux, configurable)
Custom event tracking
Configurable navigation observer for easy integration
- It can register showDialog() actions as navigation events
Disable analytics in one place, e.g. according to user changing preferences (a checkbox to share analytics)

Check /example folder for usage detail.

Challenges

Measurement Protocol can't be a complete replacement for the default Google Analytics backend:

Limited standard reports in GA4 for unsupported platforms
- You might need to create custom dimensions and customize standard reports
Measurement protocol doesn't support sending standard events, e.g. instead if screen_view events sent via Firebase, a custom event screen_view_cust is sent (with screen name param).
- This make standard Events report not useful for all 6 platforms. Yet the package allowed sending both events, which make it possible to create a custom report that can track screen views across all platforms.
No automatic geo, demographic, and language data collection for Measurement Protocol

Hence the philosophy of this package: complete analytics for the platforms supported by Firebase and essential events from unsupported platforms (Windows and Linux).

Configuring Ambilytics

Historically Firebase Analytics was used for app analytics on iOS/Android and Google Analytics for web. Now they are integrated. In order to proceed you'll need a Google Account. Using this account you will set-up a project in Firebase Console which will be linked to an account/property in Google Analytics. All reports will be available in Google Analytics Console.

The workflow has 2 steps:

Configuring Firebase Analytics for complete reporting on any of the 4 platforms (Android, iOS, macOS, Web)
Configuring Measurement Protocol for essential analytics on Windows and Linux

Configuring Firebase

Bellow you can find instructions for 2 scenarios:

Adding analytics from scratch
Adding it to existing Flutter app using Firebase Analytics

a) Setup from scratch

The below instructions are based on this manual: https://firebase.google.com/docs/flutter/setup?platform=ios

Prepare command-line tools

Install the Firebase CLI (https://firebase.google.com/docs/cli#setup_update_cli)
Log into Firebase using your Google account by running the following command:

firebase login

you can logout via logout command and than repeat the login command to change the account

Install the FlutterFire CLI by running the following command from any directory:

dart pub global activate flutterfire_cli

you might need to add the cli to path, e.g. export PATH="$PATH":"$HOME/.pub-cache/bin" for macOS

Configure Firebase/Google Analytics for each target platform

In terminal change directory to your Flutter project
Run Firebase core initialization script

flutterfire configure

Fix macOS networking. Edit macos\Runner\DebugProfile.entitlements and macos\Runner\Release.entitlements and add com.apple.security.network.client, e.g.:

	...
  <key>com.apple.security.network.client</key>
	<true/>
</dict>
</plist>

Modify and use the generated firebase_options.dart to initialize Ambilytics (see here)

You need to remove unnecessary platforms from the generated file to avoid error:

  static FirebaseOptions get currentPlatform {
  if (kIsWeb) {
    return web;
  }
  switch (defaultTargetPlatform) {
    case TargetPlatform.android:
      return android;
    case TargetPlatform.iOS:
      return ios;
    case TargetPlatform.macOS:
      return macos;
    default:
      return macos;
  }
}

Open Firebase Console (https://console.firebase.google.com/) and choose used above project. Click Analytics->Dashboard tab to the left, click Enable Google Analytics button. You will be presented with a wizard that will link Google Analytics account to Firebase project. At the last step Add the Google Analytics SDK just click Finish button as flutterfire configure command above has already taken care of that.

At this point you have Firebase/Google Analytics setup for up-to 4 platforms (Android, iOS, macOS and web). Next you need to Configure Measurement Protocol to cover Windows and Linux and Start using Ambilytics in your app and start sending events.

Notes:

Running the command will show the list of existing Firebase projects to choose one OR will suggest to create a new project.
Firebase Analytics requires native projects to be configured. I.e. various plists for macOS/iOS, google-services.json for Android etc. The above command takes care of that
You can have each platform configured individually/manually without any CLI (e.g. follow the instructions from Firebase console/Google Analytics console on configuring each native part individually) - though CLI seems easier and less error-prone
Each time a new platform is added to Flutter app you need to rerun the above command
App ID, API keys etc. will be saved to a newly created firebase_options.dart file
This step only covers Android, iOS, macOS and Web platforms
You can skip Firebase set-up and have all 6 platforms using Measurement Protocol (assuming the challenges mentioned above)

Here's an example for `flutterfire configure` output:

user@users-MacBook-Pro example % flutterfire configure
i Found 4 Firebase projects.                                                                                                                             
✔ Select a Firebase project to configure your Flutter application with · <create a new project>                                                          
✔ Enter a project id for your new Firebase project (e.g. my-cool-project) · ambilytics-example                                                           
i New Firebase project ambilytics-example created successfully.                                                                                          
✔ Which platforms should your configuration support (use arrow keys & space to select)? · ios, macos, web, android                                       
i Firebase android app com.example.example is not registered on Firebase project ambilytics-example.                                                     
i Registered a new Firebase android app on Firebase project ambilytics-example.                                                                          
i Firebase ios app com.example.example is not registered on Firebase project ambilytics-example.                                                         
i Registered a new Firebase ios app on Firebase project ambilytics-example.                                                                              
i Firebase macos app com.example.example.RunnerTests is not registered on Firebase project ambilytics-example.                                           
i Registered a new Firebase macos app on Firebase project ambilytics-example.                                                                            
i Firebase web app ambilytics_example (web) is not registered on Firebase project ambilytics-example.                                                    
i Registered a new Firebase web app on Firebase project ambilytics-example.                                                                              
? The files android/build.gradle & android/app/build.gradle will be updated to apply Firebase configuration and gradle build plugins. Do you want to cont
✔ The files android/build.gradle & android/app/build.gradle will be updated to apply Firebase configuration and gradle build plugins. Do you want to continue? · yes 

Firebase configuration file lib/firebase_options.dart generated successfully with the following Firebase apps:

Platform  Firebase App Id
web       1:777853418226:web:69da4a4f2a495cbc99cdeb
android   1:777853418226:android:d5ffad29eb40783199cdeb
ios       1:777853418226:ios:5e6533e94fef227899cdeb
macos     1:777853418226:ios:e32e65cdbc373d6599cdeb

Learn more about using this file and next steps from the documentation:
 > https://firebase.google.com/docs/flutter/setup

b) Adding to Flutter app already using Firebase Analytics

Given you have been using Firebase Analytics plugin, native platforms are already set (the above a) step is not necessary), you are using FirebaseAnalytics.logEvent() to send events and FirebaseAnalyticsObserver to plug-in to navigation events. In this case in order to switch to Ambilytics you have to:

Enable Measurement Protocol as described below
Replace all occurrences of FirebaseAnalytics.logEvent() with sendEvent() from this package and replace FirebaseAnalyticsObserver with AmbilyticsObserver. See using Ambilytics in your app

Measurement Protocol

To enable essential data sent from Windows and Linux you will have to create a new Web stream in Google Analytics to accept events sent via Measurement Protocol.

Go to Google Analytics Console (https://analytics.google.com/analytics/web/)
At the top left corner check that you're using the right property

Given that you have already setup Firebase platforms (as described above) make sure to choose the configure property in order to have data in one place for all platforms

Click Admin (gear icon at the bottom left) -> Data Stream -> Add stream button -> Web

Enter any URL and choose stream name (e.g. 'Windows-Linux')
Skip installation instructions
Copy Measurement ID
Click Measurement Protocol API secrets in the same view below. Create a new API secret and copy it.
Both values must be provided to init() method to get Measurement Protocol working (see next section)

Using Ambilytics in your app

Add firebase_core and ambilytics packages to dependencies section of pubspec.yaml:

dependencies:
dependencies:
  flutter:
    sdk: flutter  
  cupertino_icons: ^1.0.2
  firebase_core:
  ambilytics:

Import Ambilytics:

import 'package:ambilytics/ambilytics.dart' as ambilytics;

In the main function add initialization call:

void main() async {
  // This one
  await ambilytics.initAnalytics(
      measurementId: 'G-6R363DDKTZ',
      apiSecret: 'uzUv6h_iRS6hEt_sIVtTTA',
      firebaseOptions: DefaultFirebaseOptions.currentPlatform);
  runApp(const MyApp());
}

it's assumed that you have firebase_options.dart generated by flutterfire (see above) with DefaultFirebaseOptions class defined there
you've setup Measurement Protocol as described above provided correct measurementId and apiSecret

If you want to track navigation events, add navigator observer to MaterialApp, e.g.:

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      // Here
      navigatorObservers: ambilytics.isAmbilyticsInitialized
          ? [
              ambilytics.AmbilyticsObserver(
                  routeFilter: ambilytics.anyRouteFilter,
                  alwaySendScreenViewCust: true)
            ]
          : [],
      routes: {
        '/': (context) => HomeScreen(
              title: 'Home',
              analyticsError: ambilytics.initError,
            ),
        '/color/red': (context) => const ColorScreen(),
        '/color/yellow': (context) => const ColorScreen()
      },
    );
  }
}

You can send custom events via Ambilytics sendEvent function:

  void _incrementCounter() {
    setState(() {
      _counter++;
      // Here
      ambilytics.sendEvent(counterClicked, null);
    });
  }

Using Reports

The reports can be seen in both Google Analytics Console (https://analytics.google.com/analytics/web/) and Firebase Console (https://console.firebase.google.com/).

Ambilytics custom events

The package automatically sends 2 custom events:

app_launch - sent upon initialization of Ambilytics. Contains platform parameters with the name of the platform where the app is built.
screen_view_cust - sent via navigation observer upon navigation events (such as pushing a new route via Navigator API). Since Google Analytics doesn't allow sending predefined events (such as screen_view) via its' logEvent() this event is used for Windows and Linux as substitute for standard event. The events has screen_name which is set to route name (Route.settings.name)
- You can use AmbilyticsObserver.alwaySendScreenViewCust parameter to have this custom event sent along with standard screen_view with any of the Firebase platforms

Seeing custom events' params

Parameters of custom events (the above 2 and all sent via sendEvent()) by default can only be seen in Realtime view. For other reports a custom dimension must be created:

Admin (gear icon at the bottom left) -> Custom definitions -> Create custom dimensions -> type in dimension name and param -> go to reports and pick custom dimension.
- Note that you don't have to type in event name, just a description name of dimension AND exact name of parameter
Make sure you add dimensions for params of app_launch and screen_view_cust
- E.g. create app_launch_platform dimension with platform param and screen_view_cust_screen with screen_name parameter

Quote from Google docs: To see the event parameter values, you must create a custom dimension or metric for each event parameter. Once Analytics processes the custom dimension or metric, you can add it to your custom reports, audiences, explorations, and segments, and as secondary dimensions in standard reports."

Note that up to 1 day might be required to get updated data in reports outside Realtime view.

After that you should be able to see custom events and their params in reports, e.g. pick Engagement -> Events and click + sign in the Event name column and choose Custom -> [Dimension you created]

Known issues/Troubleshooting

1. Can't build macOS/iOS project with 'Error run pod install' or alike

In terminal go to macOS or iOS folder, remove Podfile.lock and run pod repo update

2. Android build fails (:app:mapReleaseSourceSetPaths)

If you get error

Execution failed for task ':app:mapReleaseSourceSetPaths'.
> Error while evaluating property 'extraGeneratedResDir' of task ':app:mapReleaseSourceSetPaths'

Go to android/build.gradle and update com.google.gms:google-services version, e.g.:

    dependencies {
        classpath 'com.android.tools.build:gradle:7.3.0'
        // START: FlutterFire Configuration
        classpath 'com.google.gms:google-services:4.3.15'
        // END: FlutterFire Configuration
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }

3. Android build fails (minSdkVersion mismatch)

Go to android/app/build.gradle and change minSdkVersion version from flutter.minSdkVersion to 19.

4. No data in Google Analytics reports

All reports outside Realtime can take up to a day to be in sync

5. No data in Realtime reports (on Android, iOS)

For mobile platforms (Android, iOS) Firebase Analytics uploads/processes data in batches, i.e. it takes some time to collect and than send and display it (presumably for battery saving). As a result you get jagged events (i.e. some come right away, some take time).

5. No data in reports from macOS clients

Check the above manual for Fix macOS and update DebugProfile.entitlements and Release.entitlements

6. `A Firebase App named "[DEFAULT]" already exists` error

Likely reason for that is that you already used FirebaseAnalytics with configured native projects and started using FirebaseOptions. You can try deleting android/app/src/google-services.json, ios/Runner/GoogleService-Info.plist and macos/Runner/GoogleService-Info.plist files and rerun flutterfire configure

7. Error initialising Firebase on a Linux or Windows environment

You may see this error: Unhandled Exception: Unsupported operation: DefaultFirebaseOptions are not supported for this platform.

This occurs when you build with the firebaseOptions in the config when building to Linux or Windows. You could conditionally add this config option if you do need to build to different environments if required.

However, Firebase config is not necessary, so perhaps if you want to use the Measurement Protocol exclusively or you are only building to a Linux and Windows environment, you can leave out the firebaseOptions config entirely...

ambilytics.initAnalytics(
    measurementId: 'G-6R363DDKTZ',
    apiSecret: 'uzUv6h_iRS6hEt_sIVtTTA',
);

Features

Challenges

Configuring Ambilytics

Configuring Firebase

a) Setup from scratch

Prepare command-line tools

Configure Firebase/Google Analytics for each target platform

b) Adding to Flutter app already using Firebase Analytics

Measurement Protocol

Using Ambilytics in your app

Using Reports

Ambilytics custom events

Seeing custom events' params

Known issues/Troubleshooting

1. Can't build macOS/iOS project with 'Error run pod install' or alike

2. Android build fails (:app:mapReleaseSourceSetPaths)

3. Android build fails (minSdkVersion mismatch)

4. No data in Google Analytics reports

5. No data in Realtime reports (on Android, iOS)

5. No data in reports from macOS clients

6. `A Firebase App named "[DEFAULT]" already exists` error

7. Error initialising Firebase on a Linux or Windows environment

Libraries

ambilytics package

Features

Challenges

Configuring Ambilytics

Configuring Firebase

a) Setup from scratch

Prepare command-line tools

Configure Firebase/Google Analytics for each target platform

b) Adding to Flutter app already using Firebase Analytics

Measurement Protocol

Using Ambilytics in your app

Using Reports

Ambilytics custom events

Seeing custom events' params

Known issues/Troubleshooting

1. Can't build macOS/iOS project with 'Error run pod install' or alike

2. Android build fails (:app:mapReleaseSourceSetPaths)

3. Android build fails (minSdkVersion mismatch)

4. No data in Google Analytics reports

5. No data in Realtime reports (on Android, iOS)

5. No data in reports from macOS clients

6. A Firebase App named "[DEFAULT]" already exists error

7. Error initialising Firebase on a Linux or Windows environment

Libraries

ambilytics package

6. `A Firebase App named "[DEFAULT]" already exists` error