如何共享链接到 Firebase 的项目的 Flutter 源代码？

Question

我有一个链接到我的Firebase帐户的Flutter项目(使用< code>FlutterFire CLI)。< br >现在我已经完成了这个项目，我想卖掉源代码。< br >如何更改与此项目关联的Firebase帐户？

当使用FlutterFire CLI时，它会生成一个名为firebase_options的文件。dart包含每个平台的Firebase选项，如下所示：

static const FirebaseOptions android = FirebaseOptions(  
 apiKey: '-------',  
 appId: '------',  
 messagingSenderId: '-----',  
 projectId: '----------',  
 storageBucket: '--------',  
  );

我必须改变这些值吗？如果是，我在哪里可以找到所有这些？

import 'firebase_options.dart';


void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp(
    options: DefaultFirebaseOptions.currentPlatform,
  );

  runApp(const MyApp());
}

// File generated by FlutterFire CLI.
// ignore_for_file: lines_longer_than_80_chars, avoid_classes_with_only_static_members
import 'package:firebase_core/firebase_core.dart' show FirebaseOptions;
import 'package:flutter/foundation.dart'
    show defaultTargetPlatform, kIsWeb, TargetPlatform;

/// Default [FirebaseOptions] for use with your Firebase apps.
///
/// Example:
/// ```dart
/// import 'firebase_options.dart';
/// // ...
/// await Firebase.initializeApp(
///   options: DefaultFirebaseOptions.currentPlatform,
/// );
/// ```
class DefaultFirebaseOptions {
  static FirebaseOptions get currentPlatform {
    if (kIsWeb) {
      return web;
    }
    switch (defaultTargetPlatform) {
      case TargetPlatform.android:
        return android;
      case TargetPlatform.iOS:
        throw UnsupportedError(
          'DefaultFirebaseOptions have not been configured for ios - '
          'you can reconfigure this by running the FlutterFire CLI again.',
        );
      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.',
        );
    }
  }

  static const FirebaseOptions web = FirebaseOptions(
    apiKey: '------',
    appId: '------',
    messagingSenderId: '-----',
    projectId: '------',
    authDomain: '--------',
    storageBucket: '--------',
    measurementId: '--------',
  );

  static const FirebaseOptions android = FirebaseOptions(
    apiKey: '----',
    appId: '----',
    messagingSenderId: '--------',
    projectId: '------',
    storageBucket: '--------',
  );
}

我试图更改值（在firebase_options.dart中），这导致了此错误：

E/flutter (26545): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: [core/duplicate-app] A Firebase App named "[DEFAULT]" already exists

它抛出此错误（来自 method_channel_firebase.dart 的复制应用程序）：

// If there is a native default app and the user provided options do a soft
// check to see if options are roughly identical (so we don't unnecessarily
// throw on minor differences such as platform specific keys missing
// e.g. hot reloads/restarts).
if (defaultApp != null && _options != null) {
  if (_options.apiKey != defaultApp.options.apiKey ||
      (_options.databaseURL != null &&
          _options.databaseURL != defaultApp.options.databaseURL) ||
      (_options.storageBucket != null &&
          _options.storageBucket != defaultApp.options.storageBucket)) {
    // Options are different; throw.
    throw duplicateApp(defaultFirebaseAppName);
  }
  // Options are roughly the same; so we'll return the existing app.
}

Answer 1

您可以更改链接到该项目的firebase帐户。您看到的这个错误

E/flutter (26545): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: [core/duplicate-app] A Firebase App named "[DEFAULT]" already exists

是由原始的gradle sync操作生成一个Google-Services.json文件并在应用程序中使用它引起的。要消除这个错误，从主flutter项目切换到android文件夹并运行

./gradlew clean

该命令调用渐变包装器，然后清理项目并将其恢复到原始状态。flutter团队使用默认的空flatter_options。他们项目的飞镖文件。如果您正在向某人查看源代码，您可能需要考虑这样做。我只会打包说明，说明如何配置他们的项目，以便与他们选择的新Firebase项目一起工作。