未处理的异常：PlatformException（null-error，主机平台针对非空返回值返回空值

问题描述 投票：0回答：1

我见过很多关于以下错误的问题： “[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)”但所有解决方案都不能解决我的问题问题 我已按照同上的所有说明进行操作，添加依赖项以及不添加的内容。我的 build.gradles 没问题，但当我运行时，我仍然收到错误。一个月前这对我有用，但现在我不知道这个月发生了什么。

Launching lib\main.dart on AOSP on IA Emulator in debug mode...
Running Gradle task 'assembleDebug'...
Parameter format not correct -
√  Built build\app\outputs\flutter-apk\app-debug.apk.
Installing build\app\outputs\flutter-apk\app-debug.apk...
Debug service listening on ws://127.0.0.1:50498/Z0uovONnF5A=/ws
Syncing files to device AOSP on IA Emulator...
E/flutter ( 8435): [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 ( 8435): #0      FirebaseCoreHostApi.optionsFromResource (package:firebase_core_platform_interface/src/pigeon/messages.pigeon.dart:248:7)
E/flutter ( 8435): <asynchronous suspension>
E/flutter ( 8435): #1      MethodChannelFirebase.initializeApp (package:firebase_core_platform_interface/src/method_channel/method_channel_firebase.dart:89:25)
E/flutter ( 8435): <asynchronous suspension>
E/flutter ( 8435): #2      Firebase.initializeApp (package:firebase_core/src/firebase.dart:43:31)
E/flutter ( 8435): <asynchronous suspension>
E/flutter ( 8435): #3      main (package:kp_app/main.dart:8:3)
E/flutter ( 8435): <asynchronous suspension>
E/flutter ( 8435):

这是我的 main.dart，你可以看到我已按照说明进行操作，我上个月这样做了，没问题，这个月我再试一次，问题

import 'package:easy_localization/easy_localization.dart';
import 'package:firebase_core/firebase_core.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();
  await EasyLocalization.ensureInitialized();
  SystemChrome.setSystemUIOverlayStyle(const SystemUiOverlayStyle(
      statusBarColor: Colors.transparent,
      statusBarIconBrightness: Brightness.dark));


  runApp(EasyLocalization(
    supportedLocales: const [
      Locale('en'),
      Locale('ar'),
      Locale('es'),
      Locale('fr'),
      Locale('de'),
      Locale('it'),
      Locale('pt'),
      Locale('ru'),
      Locale('zh'),
      Locale('ja'),
      Locale('hi'),
      Locale('sw')
    ],
    path: 'assets/translations',
    fallbackLocale: const Locale('en'),

    //Default language
    startLocale: const Locale('en'),
    useOnlyLangCode: true,
    child: const NewApp(),
  ));
}

class NewApp extends StatelessWidget {
  const NewApp({super.key});

  @override
  Widget build(BuildContext context) {
    return Container(
      color: Colors.blue,
      child: const Center(child: Text('My New APp')),
    );
  }
}

这是我的应用程序级别 build.gradle，如您所见，它完好无损

//plugins {
//    id "com.android.application"
//    id "kotlin-android"
//    id "dev.flutter.flutter-gradle-plugin"
//    id 'com.google.gms.google-services'
//}

def localProperties = new Properties()
def localPropertiesFile = rootProject.file('local.properties')
if (localPropertiesFile.exists()) {
    localPropertiesFile.withReader('UTF-8') { reader ->
        localProperties.load(reader)
    }
}

def flutterRoot = localProperties.getProperty('flutter.sdk')
if (flutterRoot == null) {
    throw  GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
}

def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
if (flutterVersionCode == null) {
    flutterVersionCode = '1'
}

def flutterVersionName = localProperties.getProperty('flutter.versionName')
if (flutterVersionName == null) {
    flutterVersionName = '1.0'
}

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

//apply plugin: 'dev.flutter.flutter-gradle-plugin'

android {
    namespace "com.prowebsolutions.kp_app"
    compileSdkVersion 33
    ndkVersion flutter.ndkVersion

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

    kotlinOptions {
        jvmTarget = '1.8'
    }

    sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
    }

    defaultConfig {
        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
        applicationId "com.prowebsolutions.kp_app"
        // You can update the following values to match your application needs.
        // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-gradle-build-configuration.
        minSdkVersion 28
        //noinspection OldTargetApi
        targetSdkVersion 31
//        targetSdkVersion flutter.targetSdkVersion
        multiDexEnabled true
        versionCode flutterVersionCode.toInteger()
        versionName flutterVersionName
    }

    buildTypes {
        release {
            // TODO: Add your own signing config for the release build.
            // Signing with the debug keys for now, so `flutter run --release` works.
            signingConfig signingConfigs.debug
        }
    }
}

flutter {
    source '../..'
}

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation platform('com.google.firebase:firebase-bom:32.3.1')
    implementation 'com.google.firebase:firebase-analytics'
}

这也是我的项目级别build.gradle完好无损

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

    dependencies {
        classpath 'com.android.tools.build:gradle:7.3.1'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath 'com.google.gms:google-services:4.4.0'
    }
}

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

rootProject.buildDir = '../build'
subprojects {
    project.buildDir = "${rootProject.buildDir}/${project.name}"
}
subprojects {
    project.evaluationDependsOn(':app')
}

tasks.register("clean", Delete) {
    delete rootProject.buildDir
}
android flutter firebase android-gradle-plugin
1个回答
0
投票

您好，Google服务版本尝试降级到4.3.15 其他解决方案是将构建脚本迁移到插件块检查下一个：

文件 -> android/settings.gradle

pluginManagement {
    repositories {
        google()
        mavenCentral()
        gradlePluginPortal()
    }
    def flutterSdkPath = {
        def properties = new Properties()
        file("local.properties").withInputStream { properties.load(it) }
        def flutterSdkPath = properties.getProperty("flutter.sdk")
        assert flutterSdkPath != null, "flutter.sdk not set in local.properties"
        return flutterSdkPath
    }
    settings.ext.flutterSdkPath = flutterSdkPath()

    includeBuild("${settings.ext.flutterSdkPath}/packages/flutter_tools/gradle")

    plugins {
        id "dev.flutter.flutter-gradle-plugin" version "1.0.0" apply false
    }
}

include ":app"

apply from: "${settings.ext.flutterSdkPath}/packages/flutter_tools/gradle/app_plugin_loader.gradle"

文件 -> android/build.gradle

plugins {
    id 'com.android.application' version '7.3.0' apply false
    id 'org.jetbrains.kotlin.android' version '1.7.10' apply false
    id 'com.google.gms.google-services' version '4.3.15' apply false
    id 'com.google.firebase.crashlytics' version '2.9.9' apply false
}

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

rootProject.buildDir = '../build'

subprojects {
    project.buildDir = "${rootProject.buildDir}/${project.name}"
    project.evaluationDependsOn(':app')
}

tasks.register("clean", Delete) {
    delete rootProject.buildDir
}

文件 -> android/app/build.gradle

plugins {
    id "com.android.application"
    id "kotlin-android"
    id "dev.flutter.flutter-gradle-plugin"
    id 'com.google.gms.google-services'    
    id 'com.google.firebase.crashlytics'
}

def localProperties = new Properties()
def localPropertiesFile = rootProject.file('local.properties')
if (localPropertiesFile.exists()) {
    localPropertiesFile.withReader('UTF-8') { reader ->
        localProperties.load(reader)
    }
}

def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
if (flutterVersionCode == null) {
    flutterVersionCode = '1'
}

def flutterVersionName = localProperties.getProperty('flutter.versionName')
if (flutterVersionName == null) {
    flutterVersionName = '1.0'
}

android {
    namespace "com.example.test_app"
    compileSdkVersion flutter.compileSdkVersion
    ndkVersion flutter.ndkVersion

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

    kotlinOptions {
        jvmTarget = '1.8'
    }

    sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
    }

    defaultConfig {
        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
        applicationId "com.example.test_app"
        // You can update the following values to match your application needs.
        // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-gradle-build-configuration.
        minSdkVersion localProperties.getProperty('flutter.minSdkVersion')
        targetSdkVersion flutter.targetSdkVersion
        versionCode flutterVersionCode.toInteger()
        versionName flutterVersionName
    }

    buildTypes {
        release {
            // TODO: Add your own signing config for the release build.
            // Signing with the debug keys for now, so `flutter run --release` works.
            signingConfig signingConfigs.debug
        }
    }
}

flutter {
    source '../..'
}

dependencies {
    implementation platform('com.google.firebase:firebase-bom:32.3.1')
    implementation 'com.google.firebase:firebase-crashlytics'
    implementation 'com.google.firebase:firebase-analytics'
}

文件 -> android/local.properties

#Add your Android SDK path    
sdk.dir=D:\\Users\\Alex\\Sdk
#Add your Flutter path SDK  
flutter.sdk=D:\\Users\\Alex\\Flutter 
flutter.minSdkVersion=24
flutter.buildMode=debug
flutter.versionName=1.0.0
flutter.versionCode=1

最后在

flutter clean
后执行
flutter pub get --no-example

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