For Android

To Register your Flutter App to Firebase, you need to follow the following steps:

1. Sign into Firebase using your Google account.

2. Create a Firebase project by clicking on Add project in the Firebase console and then entering a Project Name(e.g. flutterstarter).

3. To add an Android app, click the icon to launch the setup workflow. Enter com.flutterstarter.app in Android package name field.

4. Click Download google-services.json to obtain your Firebase Android config file(google-services.json).

5. Move your config file into the android/app directory of your Flutter app.

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

   1. In your root-level (project-level) Gradle file(app/android/build.gradle):

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

   2. In your module (app-level) Gradle file (usually app/android/app/build.gradle), apply the Google Services Gradle plugin.

     // Add the following line:
     apply plugin: 'com.google.gms.google-services'  // Google Services plugin
   
     android {
       // ...
     }
   
     // ...
   

7. Add Flutter plugins in pubspec.yaml file.

dependencies:
  flutter:
    sdk: flutter
  //Add plugins here
  cloud_firestore: ^0.12.9
  firebase_core: ^0.4.0+8

8. Run flutter packages get and you are good to go.