Flutter中Firebase初始化报PlatformException(null-error)问题求助

错误信息 #

E/flutter ( 7704): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: PlatformException(null-error, Host platform returned null value for non-null return value., null, null)
E/flutter ( 7704): #0      FirebaseCoreHostApi.optionsFromResource (package:firebase_core_platform_interface/src/pigeon/messages.pigeon.dart:248:7)
E/flutter ( 7704): <asynchronous suspension>
E/flutter ( 7704): #1      MethodChannelFirebase.initializeApp (package:firebase_core_platform_interface/src/method_channel/method_channel_firebase.dart:89:25)
E/flutter ( 7704): <asynchronous suspension>
E/flutter ( 7704): #2      Firebase.initializeApp (package:firebase_core/src/firebase.dart:43:31)
E/flutter ( 7704): <asynchronous suspension>
E/flutter ( 7704): #3      main (package:vendorapp/main.dart:6:3)
E/flutter ( 7704): <asynchronous suspension>

已配置的Gradle文件 #

app/build.gradle #

apply plugin: 'com.google.gms.google-services'
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'

project/build.gradle #

ext.kotlin_version = '1.7.10'
repositories {
google()
mavenCentral()
}

dependencies {
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
classpath 'com.google.gms:google-services:4.4.0'
classpath 'com.android.tools.build:gradle:7.3.0'
}
}

allprojects {
repositories {
google()
mavenCentral()
}

解决步骤 #

• 检查配置文件位置
  确认从Firebase控制台下载的google-services.json已正确放置在android/app目录下，文件内容需与当前项目的Firebase配置完全匹配。

• 调整插件顺序
  com.google.gms.google-services插件必须放在最后加载，修改app/build.gradle的插件部分：

  apply plugin: 'com.android.application'
  apply plugin: 'kotlin-android'
  apply plugin: 'com.google.gms.google-services'
  

• 清理缓存并重构
  执行以下命令清理项目缓存，避免旧配置干扰：

  flutter clean
  cd android && ./gradlew clean
  cd .. && flutter pub get
  flutter run
  

• 修正project/build.gradle语法错误
  原配置中多了一个闭合的}，修正后完整配置：

  ext.kotlin_version = '1.7.10'
  buildscript {
    repositories {
      google()
      mavenCentral()
    }
    dependencies {
      classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
      classpath 'com.google.gms:google-services:4.4.0'
      classpath 'com.android.tools.build:gradle:7.3.0'
    }
  }
  
  allprojects {
    repositories {
      google()
      mavenCentral()
    }
  }
  

• 手动传入初始化参数
  如果自动读取配置失败，可从Firebase控制台获取参数，手动初始化：

  import 'package:flutter/material.dart';
  import 'package:firebase_core/firebase_core.dart';
  
  void main() async {
    WidgetsFlutterBinding.ensureInitialized();
    await Firebase.initializeApp(
      options: FirebaseOptions(
        apiKey: "你的API_KEY",
        appId: "你的APP_ID",
        messagingSenderId: "你的SENDER_ID",
        projectId: "你的PROJECT_ID",
      ),
    );
    runApp(MyApp());
  }
  

• 检查依赖版本兼容性
  确保pubspec.yaml中firebase_core的版本与Gradle、Kotlin版本兼容，建议使用最新稳定版：

  dependencies:
    firebase_core: ^2.15.0
  

内容的提问来源于stack exchange，提问作者Ezz