Firebase_Interaction_Sample

1. Create Firebase project
2. Add firebase_auth and firebase_core
3. Add to main.dart:

   WidgetsFlutterBinding.ensureInitialized();
   await Firebase.initializeApp();

4. Get SHA-1 and SHA-256 keys

Android

6. Insert the keys in project settings in Firebase Console
7. Download google-services.json and place it to /android/app/
8. Add classpath 'com.google.gms:google-services:4.3.5' to /android/build.gradle dependencies

9a. Optional: to remove captcha

• enable the Android Device Verification API on google cloud console (left menu --> APIs&Services --> Credentials)

• add SHA-1 in the EXISTING project on that page (there're will be the one from Firebase). THERE'S NO POINT IN CREATING A NEW PROJECT

• additionally, for iOS one can use: await FirebaseAuth.instance.setSettings(appVerificationDisabledForTesting: true);

  DON'T FORGET TO REMOVE IT in release version - it won't work

9b. Optional: to enable multidex support

• add the google-services plugin as a dependency inside of the android/build.gradle file:

    buildscript {
    dependencies {
      // ... other dependencies
      classpath 'com.google.gms:google-services:4.3.3'
    }
  }
  

• execute the plugin by adding the following underneath the line apply plugin: com.android.application, within the /android/app/build.gradle file:

  apply plugin: 'com.google.gms.google-services'
  

• open the /android/app/build.gradle file. Under dependencies add the multidex module, and enable it within the defaultConfig:

   android {
          defaultConfig {
              // ...
              minSdkVersion 16
              targetSdkVersion 28
              multiDexEnabled true
          }
      }
  
      dependencies {
        implementation 'com.android.support:multidex:1.0.3'
      }
  

iOS

10. Add app to project in Firebase Console
11. Download GoogleService-Info.plist and place it in XCode to to Runner -> Runner (next to Info.plist)
12. Set the MinimumOSversion to 10.0 in ios/Flutter/AppFrameworkInfo.plist
13. In Xcode, ensure that at Runner -> Project -> Runner -> Build Settings -> Basic -> Deployment -> iOS Deployment Target is set to 10.0
14. In Xcode, ensure that at Runner -> Targets -> Runner -> Build Settings -> Basic -> Deployment -> iOS Deployment Target is set to 10.0
15. In Xcode, ensure that at Runner -> Targets -> Runner -> General -> Deployment Info ios is set to 10.0
16. In Podfile: uncomment the line platform :ios, '10.0'
17. In Podfile: ensure that it contains the following post install script:

     post_install do |installer|
      installer.pods_project.targets.each do |target|
        flutter_additional_ios_build_settings(target)
        target.build_configurations.each do |config|
          config.build_settings['IPHONEOS_DEPLOYMENT_TARGET'] = '10.0'
        end
      end
    end
    

18. Run

    flutter clean \
        && rm ios/Podfile.lock pubspec.lock \
        && rm -rf ios/Pods ios/Runner.xcworkspace
    

19. Run flutter pub get
20. From within /ios run pod install
21. Do NOT add this line to the end of the file to speed up build:

    pod 'FirebaseFirestore', :git => 'https://github.com/invertase/firestore-ios-sdk-frameworks.git', :tag => '6.26.0'
    

    it's from here