是否可以在flutter中的应用程序中配置firebase数据库连接设置？如果可以的话我该怎么办？

Question

是否可以在flutter应用程序中配置firebase数据库连接设置？如果可以的话我该怎么办？

void main() async{
WidgetsFlutterBinding.ensureInitialized();
final settingsController = Get.put(SettingsController());
await  settingsController.loadSettings();`
await Firebase.initializeApp(
options: settingsController.firebaseOptions,
);
runApp(const MyApp());
}


class SettingsController extends GetxController {
var apiKey = ''.obs;
var projectId = ''.obs;
var messagingSenderId = ''.obs;
var appId = ''.obs;

@override
void onInit() {
super.onInit();
loadSettings();
}

Future <void> loadSettings() async {
final prefs = await SharedPreferences.getInstance();
apiKey.value = prefs.getString('apiKey') ?? '';
projectId.value = prefs.getString('projectId') ?? '';
messagingSenderId.value = prefs.getString('messagingSenderId') ?? '';
appId.value = prefs.getString('appId') ?? '';
}

Future <void> saveSettings() async {
final prefs = await SharedPreferences.getInstance();
await prefs.setString('apiKey', apiKey.value);
await prefs.setString('projectId', projectId.value);
await prefs.setString('messagingSenderId', messagingSenderId.value);
await prefs.setString('appId', appId.value);

}

FirebaseOptions get firebaseOptions => FirebaseOptions(
apiKey: apiKey.value,
projectId: projectId.value,
messagingSenderId: messagingSenderId.value,
appId: appId.value,
);
}

尝试执行此操作时我通常会收到此错误 [错误：flutter/runtime/dart_vm_initializer.cc(41)] 未处理的异常：[core/duplicate-app] 名为“[DEFAULT]”的 Firebase 应用程序已存在

实际上，我的目标是获取用户的信息并在 Firebase 选项中禁用识别。由于我没有任何信息，所以我问你，如果不起作用，我将继续使用 SQLite 进行我的项目。

Answer 1

        class DefaultFirebaseOptions {
      
    
        static FirebaseOptions get currentPlatform {
        if (kIsWeb) {
          throw UnsupportedError(
            'DefaultFirebaseOptions have not been configured for web - '
                'you can reconfigure this by running the FlutterFire CLI again.',
          );
        }
        switch (defaultTargetPlatform) {
          case TargetPlatform.android:
            return android;
          case TargetPlatform.iOS:
            return ios;
          case TargetPlatform.macOS:
            throw UnsupportedError(
              'DefaultFirebaseOptions have not been configured for macos - '
                  'you can reconfigure this by running the FlutterFire CLI again.',
            );
          case TargetPlatform.windows:
            throw UnsupportedError(
              'DefaultFirebaseOptions have not been configured for windows - '
                  'you can reconfigure this by running the FlutterFire CLI again.',
            );
          case TargetPlatform.linux:
            throw UnsupportedError(
              'DefaultFirebaseOptions have not been configured for linux - '
                  'you can reconfigure this by running the FlutterFire CLI again.',
            );
          default:
            throw UnsupportedError(
              'DefaultFirebaseOptions are not supported for this platform.',
            );
        }
      }
    //----------try with intial value Of firebase Configuration
--------      
static const FirebaseOptions android = FirebaseOptions(
        apiKey: '',
        appId: '',
        messagingSenderId: '',
        projectId: '',
        storageBucket: '',
      );
    
      static const FirebaseOptions ios = FirebaseOptions(
        apiKey: '',
        appId: '',
        messagingSenderId: '',
        projectId: '',
        storageBucket: '',
        iosBundleId: '',
      );
    }

在主.dart

  WidgetsFlutterBinding.ensureInitialized();
  // Sets the preferred orientation to portrait mode
  await Firebase.initializeApp(
    options: DefaultFirebaseOptions.currentPlatform,
  );

我做了很多次，效果很好