无法访问 Cloud Firestore 后端。后端10秒内没有响应 - Flutter Android Studio

Question

我正在 Android Studio 中使用 flutter。

我在控制台中得到这个：

W/Firestore(26053): (24.2.2) [OnlineStateTracker]: Could not reach Cloud Firestore backend. Backend didn't respond within 10 seconds
W/Firestore(26053): 
W/Firestore(26053): This typically indicates that your device does not have a healthy Internet connection at the moment. The client will operate in offline mode until it is able to successfully connect to the backend.
E/flutter (26053): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: [cloud_firestore/unavailable] The service is currently unavailable. This is a most likely a transient condition and may be corrected by retrying with a backoff.
E/flutter (26053): #0      checkIfDocExists (package:crypto_app/Functions/firestorehelper.dart:29:5)
E/flutter (26053): <asynchronous suspension>
E/flutter (26053): #1      _MainPagesState._checkUsername (package:crypto_app/UI/mainpages.dart:63:21)
E/flutter (26053): <asynchronous suspension>
E/flutter (26053): 
W/Firestore(26053): (24.2.2) [WatchStream]: (a4a9ed6) Stream closed with status: Status{code=UNAVAILABLE, description=Channel shutdownNow invoked, cause=null}.

我努力了：

1. 放入<uses-permission android:name="android.permission.INTERNET" />所有 3 个 AndroidManifest.xml 文件
2. 将<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />AndroidManifest.xml 放入 main 下
3. 启用多重分包
4. 使用了不同的 wifi 连接
5. 第二天回来查看同样的问题
6. 我的最低 SDK 版本是 21
7. 将我的代码复制到一个新项目

这是我的主要功能：

W/Firestore(26053): (24.2.2) [OnlineStateTracker]: Could not reach Cloud Firestore backend. Backend didn't respond within 10 seconds
W/Firestore(26053): 
W/Firestore(26053): This typically indicates that your device does not have a healthy Internet connection at the moment. The client will operate in offline mode until it is able to successfully connect to the backend.
E/flutter (26053): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: [cloud_firestore/unavailable] The service is currently unavailable. This is a most likely a transient condition and may be corrected by retrying with a backoff.
E/flutter (26053): #0      checkIfDocExists (package:crypto_app/Functions/firestorehelper.dart:29:5)
E/flutter (26053): <asynchronous suspension>
E/flutter (26053): #1      _MainPagesState._checkUsername (package:crypto_app/UI/mainpages.dart:63:21)
E/flutter (26053): <asynchronous suspension>
E/flutter (26053): 
W/Firestore(26053): (24.2.2) [WatchStream]: (a4a9ed6) Stream closed with status: Status{code=UNAVAILABLE, description=Channel shutdownNow invoked, cause=null}.

我应该正确初始化应用程序，因为我在控制台中得到了他的信息：

I/FirebaseApp(26053): Device unlocked: initializing all Firebase APIs for app Retrospect
I/flutter (26053): Refreshing
W/DynamiteModule(26053): Local module descriptor class for com.google.android.gms.providerinstaller.dynamite not found.
I/DynamiteModule(26053): Considering local module com.google.android.gms.providerinstaller.dynamite:0 and remote module com.google.android.gms.providerinstaller.dynamite:0
W/ProviderInstaller(26053): Failed to load providerinstaller module: No acceptable module com.google.android.gms.providerinstaller.dynamite found. Local version is 0 and remote version is 0.

该问题可能是由线路引起的W/DynamiteModule(26053): Local module descriptor class for com.google.android.gms.providerinstaller.dynamite not found.，我也无法解决。

这是我的 pubspec.yaml 文件依赖项：

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp(
    name: 'Retrospect',
    options: DefaultFirebaseOptions.currentPlatform,
  );

  runApp(MyApp());
}

我相信我正在使用最新版本的 firebase_core 和 cloud_firestore。

我的 app/build.gradle 文件依赖项和插件：

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'com.google.gms.google-services'
apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation "com.android.support:multidex:1.0.3"
    implementation 'com.google.android.material:material:1.6.1'
    implementation 'com.google.android.gms:play-services-ads:21.1.0'
    implementation platform('com.google.firebase:firebase-bom:30.3.2')
    implementation 'com.google.firebase:firebase-analytics-ktx'
    implementation 'com.google.firebase:firebase-storage-ktx'
}

我的 build.gradle 文件：

buildscript {
    ext.kotlin_version = '1.6.10'
    repositories {
        google()
        mavenCentral()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:7.1.2'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath 'com.google.gms:google-services:4.3.13'
    }
}

allprojects {
    repositories {
        google()
        mavenCentral()
    }
}

google-services.json 文件位置：

这是我在 Firestore 中的规则（规则应该不是问题，因为我能够使用 python 成功读取数据。

rules_version = '2';
service cloud.firestore {
  match /databases/{database}/documents {
    match /{document=**} {
      allow read, write: if
          request.time < timestamp.date(2022, 12, 12);
    }
  }
}

最后，这是我调用的函数：

I/FirebaseApp(26053): Device unlocked: initializing all Firebase APIs for app Retrospect
I/flutter (26053): Refreshing
W/DynamiteModule(26053): Local module descriptor class for com.google.android.gms.providerinstaller.dynamite not found.
I/DynamiteModule(26053): Considering local module com.google.android.gms.providerinstaller.dynamite:0 and remote module com.google.android.gms.providerinstaller.dynamite:0
W/ProviderInstaller(26053): Failed to load providerinstaller module: No acceptable module com.google.android.gms.providerinstaller.dynamite found. Local version is 0 and remote version is 0.

导致此错误的原因是什么？（我根本无法通过flutter访问Cloud Firestore）。我没有看到我的防病毒软件 (Windows Defender) 或防火墙阻止任何内容，但如果需要，我可以提供日志。

Answer 1

感谢@Damian 提供的解决方案！

问题出在模拟器上，而不是代码本身

在此处阅读更多信息：Firebase 无法在 Android Studio 模拟器上运行

如何继续解决此问题：

• 如果您没有过度使用Firestore，您可以尝试通过云函数http调用来访问数据。