Add Firebase to your Flutter app

Follow this guide to add Firebase products to a Flutter app.

Step 1: Set up your environment

Install Flutter for your specific operating system, including the installation of the following:
- Flutter SDK
- Supporting libraries
- Platform-specific software and SDKs
Install your preferred editor or IDE, such as Android Studio, IntelliJ, Xcode, or VS Code.
Open your Flutter app in your preferred editor or IDE.
- iOS development — The app must target iOS 8 or later.
- Android development — The app must target API level 16 (Jelly Bean) or later.
Note: If you don't already have a Flutter app, you can complete the Get Started: Test Drive to create a new Flutter app using your preferred editor or IDE.
Set up a device or emulator for running your app.
- Android development — Emulators must use an emulator image with Google Play.
Sign into Firebase using your Google account.

Step 2: Create a Firebase project

Before you can add Firebase to your Flutter app, you need to create a Firebase project to connect to your app. Visit Understand Firebase Projects to learn more about Firebase projects.

Create a Firebase project

In the Firebase console, click Add project, then select or enter a Project name.

If you have an existing Google Cloud Platform (GCP) project, you can select the project from the dropdown menu to add Firebase resources to that project.
(Optional) If you created a new project, you can edit the Project ID.

Firebase automatically assigns a unique ID to your Firebase project. Visit Understand Firebase Projects to learn about how Firebase uses the project ID.

After Firebase provisions resources for your Firebase project, you cannot change your project ID.
To use a specific identifier, you must edit your project ID during this setup step.
Click Continue.

(Optional) Set up Google Analytics for your project, which enables you to have an optimal experience using any of the following Firebase products:

When prompted, select to use an existing Google Analytics account or to create a new account.
If you choose to create a new account, select your Analytics reporting location, then accept the data sharing settings and Google Analytics terms for your project.

Click Create project (or Add Firebase, if you're using an existing GCP project).

Firebase automatically provisions resources for your Firebase project. When the process completes, you'll be taken to the overview page for your Firebase project in the Firebase console.

Step 3: Configure your app to use Firebase

You can configure one or more apps to connect with your Firebase project. To do this, register your app's platform-specific ID with your Firebase project. Firebase will automatically generate configuration files for your app.

For detailed instructions to configure your app, follow the platform-specific steps below for iOS and for Android.

In the top-level directory of your Flutter app, the ios and android directories hold platform-specific configuration files for iOS and Android.

Configure an iOS app

In the center of the Firebase console's project overview page, click the iOS icon to launch the setup workflow.

If you've already added an app to your Firebase project, click Add app to display the platform options.
Add your app to your Firebase project:
1. Enter your app’s bundle ID in the iOS bundle ID field.
  - Find this bundle ID by opening your app in XCode, then accessing the General tab in the top-level Runner directory. The value of the Bundle Identifier field is the iOS bundle ID (for example, com.yourcompany.yourproject).
2. (Optional) Enter other app information as prompted by the setup workflow.
3. Click Register app.
Add the Firebase iOS configuration file to your app:
1. Click Download GoogleService-Info.plist to obtain your Firebase iOS config file (GoogleService-Info.plist).
  - You can download your Firebase iOS config file again at any time.
  - Make sure the config file is not appended with additional characters, like (2).
2. Move the file into the Runner/Runner directory of your Flutter app.
Note: The Firebase config file contains unique, but non-secret identifiers for your project.
Visit Understand Firebase Projects to learn more about this config file.
Back in the Firebase console setup workflow, click Next to skip the remaining steps.
Continue to Add FlutterFire plugins.

Configure an Android app

In the center of the Firebase console's project overview page, click the Android icon to launch the setup workflow.

Note: If you've already added an app to your Firebase project (for example, an iOS app), click Add app to display the platform options.
Add your app to your Firebase project:
1. Enter your app’s application ID in the Android package name field.
  - An application ID is sometimes referred to as as a package name.
  - Find this application ID in your module (app-level) Gradle file, usually android/app/build.gradle (example application ID: com.yourcompany.yourproject).
2. (Optional) Enter other app information as prompted by the setup workflow.
  
  Note: SHA-1 information is required by Google Sign In and Firebase Dynamic Links.
3. Click Register app.
Add the Firebase Android configuration file to your app:
1. Click Download google-services.json to obtain your Firebase Android config file (google-services.json).
  - You can download your Firebase Android config file again at any time.
  - Make sure the config file is not appended with additional characters, like (2).
2. Move your config file into the android/app directory of your Flutter app.
Note: The Firebase config file contains unique, but non-secret identifiers for your project.
Visit Understand Firebase Projects to learn more about this config file.

To enable Firebase services in your Android app, add the google-services plugin to your Gradle files.

In your root-level (project-level) Gradle file (android/build.gradle), add rules to include the Google Services plugin. Check that you have Google’s Maven repository, as well.

buildscript {

  repositories {
    // Check that you have the following line (if not, add it):
    google()  // Google's Maven repository
  }

  // ...
  dependencies {
    // ...

    // Add the following line:
    classpath 'com.google.gms:google-services:3.2.1'  // Google Services plugin
  }
}
allprojects {
  // ...

  repositories {
    // Check that you have following line (if not, add it):
    google()  // Google's Maven repository
    // ...
  }
}

In your module (app-level) Gradle file (usually android/app/build.gradle), add the following line to the bottom of the file.

dependencies {
  // ...
}

// ...

// Add the following line to the bottom of the file:
apply plugin: 'com.google.gms.google-services'  // Google Play services Gradle plugin

Run flutter packages get.

For more information about managing packages and plugins, refer to Using Packages.

Continue to Add FlutterFire plugins.

Step 4: Add FlutterFire plugins

Flutter uses plugins to provide access to a wide range of platform-specific services, such as Firebase APIs. Plugins include platform-specific code to access services and APIs on each platform.

Firebase is accessed through a number of different libraries, one for each Firebase product (for example: Realtime Database, Authentication, Analytics, or Storage). Flutter provides a set of Firebase plugins, which are collectively called FlutterFire.

Since Flutter is a multi-platform SDK, each FlutterFire plugin is applicable for both iOS and Android. So, if you add any FlutterFire plugin to your Flutter app, it will be used by both the iOS and Android versions of your Firebase app.

Be sure to check the FlutterFire docs for the most up-to-date list of FlutterFire plugins.

Ensure that your app is not currently running in your emulator or on your device.
From the root directory of your Flutter app, open your pubspec.yaml file.
Add the FlutterFire plugin for the Firebase Core Flutter SDK.

Note: All Flutter-Firebase apps, both iOS and Android versions, require the firebase_core plugin for Flutter.
```
dependencies:
  flutter:
    sdk: flutter
  # Add the dependency for the Firebase Core Flutter SDK
  firebase_core: ^0.4.0+1
```

Add the FlutterFire plugins for the Firebase products that you want to use in your app.

Analytics enabled

dependencies:
  flutter:
    sdk: flutter
  # Check that you have this dependency (added in the previous step)
  firebase_core: ^0.4.0+1

  # Add the dependency for the FlutterFire plugin for Google Analytics
  firebase_analytics: ^4.0.2

  # Add the dependencies for any other Firebase products you want to use in your app
  # For example, to use Firebase Authentication and Cloud Firestore
  firebase_auth: ^0.11.1+3
  firebase_firestore: ^0.12.7+1

Analytics not enabled

dependencies:
  flutter:
    sdk: flutter
  # Check that you have this dependency (added in the previous step)
  firebase_core: ^0.4.0+1

  # Add the dependencies for the Firebase products you want to use in your app
  # For example, to use Firebase Authentication and Cloud Firestore
  firebase_auth: ^0.11.1+3
  firebase_firestore: ^0.12.7+1

Run flutter packages get.

For more information about managing packages and plugins, refer to Using Packages.
If you added Analytics, run your app to send verification to Firebase that you've successfully integrated Firebase. Otherwise, you can skip the verification step.

You’re all set! Your Flutter app is registered and configured to use Firebase.

Try out an example app with Analytics

Like all packages, the firebase_analytics plugin comes with an example program.

Open a Flutter app that you've already configured to use Firebase.
Access the lib directory of the app, then delete the existing main.dart file.
From the Google Analytics example program repository, copy-paste the following two files into your app's lib directory:
- main.dart
- tabs_page.dart
Run your Flutter app.
Go to your app's Firebase project in the Firebase console, then click Analytics in the left-nav.
- Click Dashboard. If Analytics is working properly, the dashboard shows an active user in the "Users active in the last 30 minutes" panel (this might take time to populate this panel).
- Click DebugView. Enable the feature to see all the events generated by the example program.

For more information about setting up Analytics, visit the getting started guides for iOS and for Android.

Next steps

Review the list of FlutterFire plugins.
Get hands-on experience with the Firebase Flutter Codelab.
Prepare to launch your app:
- Set billing alerts.
- Review the Firebase launch checklist.