Flutter Google Login

steps

check if all your current project dependencies support null safety by using:

```dart pub outdated --mode=null-safety```


Then, run the following command to migrate:

```dart migrate```


Add these dependencies to your `pubspec.yaml`

firebase_core: ^1.0.1
firebase_auth: ^1.0.1
google_sign_in: ^5.0.0


Then update packages:

```flutter packages get```


Go to the Firebase console 
  - create a project
  - set up for android
  - android package same as yours
  - SHA-1 got it with: 
    - java keytool (It's in "C:\Program Files\Java\jdk1.8.0_321\bin")
    - ```keytool -list -v -alias androiddebugkey -keystore %USERPROFILE%\.android\debug.keystore``` default pwd: android