main.dart

void initiateFacebookLogin() async {
    var facebookLogin = FacebookLogin();
    var facebookLoginResult =
        await facebookLogin.logInWithReadPermissions(['email']);
     switch (facebookLoginResult.status) {
      case FacebookLoginStatus.error:
        print("Error");
        onLoginStatusChanged(false);
        break;
      case FacebookLoginStatus.cancelledByUser:
        print("CancelledByUser");
        onLoginStatusChanged(false);
        break;
      case FacebookLoginStatus.loggedIn:
        print("LoggedIn");
        onLoginStatusChanged(true);
        break;
    }
  }