Before using FlutterFire on Android, you must first connect to your Firebase project with your Android application.
Generating a Firebase project configuration file
On the Firebase Console, add a new Android app or select an existing Android app for your Firebase project.
The "Android package name" must match your local project's package name that was created when you started the
Flutter project. The current package name can be found in your module (app-level) Gradle file,
defaultConfig section (example package name:
When creating a new Android app "debug signing certificate SHA-1" is optional, however, it is required for Dynamic Links & Phone Authentication. To generate a certificate run
cd android && ./gradlew signingReportand copy the SHA1 from the
debugkey. This generates two variant keys. You can copy the 'SHA1' that belongs to the
debugAndroidTestvariant key option.
Once your Android app has been registered, download the configuration file from the Firebase Console (the file is called
google-services.json). Add this file into the
android/app directory within your Flutter project.
Installing your Firebase configuration file
To allow Firebase to use the configuration on Android, the 'google-services' plugin must be applied on the project. This requires
modification to two files in the
First, add the 'google-services' plugin as a dependency inside of the
Lastly, execute the plugin by adding the following underneath the line
apply plugin: 'com.android.application', within
Building for Android
Due to the large number of classes in some of the Firebase SDKs (specifically Firestore), it may bump you over the 64k method limit on the Android
build system and you may get an error stating
Error while merging dex archives: The number of method references in a .dex file cannot exceed 64K.
If you do get this error, we suggest enabling Multidex for Android.
If your app only targets Android 21 or higher (
minSdkVersion) then multidex is already enabled by default and you do not need the multidex support library.
However, if your
minSdkVersion is set to 20 or lower, then you must use the multidex support library and make the following modifications to your app project:
/android/app/build.gradle file. Under
dependencies add the multidex module, and enable it within
Visit the official Android documentation to learn more.
Once complete follow the instructions on Initializing FlutterFire.