android - Flutter - 如何在 Firebase 中写入数据(实时 ddb): permission denied

Question

我想在 Firebase 中写入数据，但出现权限错误，这是我尝试过的:

void initState() {
    super.initState();
    testFirebase();
 }

 Future testFirebase() async {

    initUser();

    //Initialize Firebase
    final FirebaseApp firebaseApp = await FirebaseApp.configure( ... );

    final FirebaseDatabase database = new FirebaseDatabase(app: firebaseApp);

    database.reference().child('counter').push().set(<String, String>{
      'var': 'test'
    });
  }

  Future initUser() async {
    googleUser = await _ensureLoggedInOnStartUp();
    if (googleUser == null) {
       setState(() {
         state.isLoading = false;
       });
    } else {
       var firebaseUser = await logIntoFirebase();
    }
  }

这是我的 Firebase 规则:

google-services.json 文件添加到应用根目录:

结果:

我收到以下错误消息:

我也尝试过:

push().setValue('2')

但它不起作用，这让我发疯，我不明白......

有什么想法吗？

Answer 1

快速初步检查是您需要await initUser()。所以:

Future testFirebase() async {

    await initUser();

    //Initialize Firebase
    final FirebaseApp firebaseApp = await FirebaseApp.configure( ... );

如果没有它，我希望在身份验证完成之前开始调用数据库。

---

更新:我刚刚用这个简单的代码验证了情况确实如此:

void _signin() async {
  print("Calling __actuallySignin");
  __actuallySignin();
  print("called __actuallySignin and waited");
}
void __actuallySignin() async {
  print("Calling signIn...");
  await FirebaseAuth.instance.signInAnonymously();
  print("called signIn... and waited");
}

这打印:

flutter: Calling __actuallySignin
flutter: called __actuallySignin and waited
flutter: Calling signIn...
...
flutter: called signIn... and waited

因此 __actuallySignin 方法在登录完成之前完成。要使调用代码等待您添加 await 的结果:

await __actuallySignin();

哪些输出:

flutter: Calling __actuallySignin
flutter: Calling signIn...
flutter: called signIn... and waited
flutter: called __actuallySignin and waited