Flutter打包APK报错：Could not get unknown property 'android' for :firebase_core

尝试执行flutter build apk构建Android应用时失败，报错信息如下：

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring project ':firebase_core'.
> Failed to notify project evaluation listener.
   > Could not get unknown property 'android' for project ':firebase_core' of type org.gradle.api.Project.
   > Could not get unknown property 'android' for project ':firebase_core' of type org.gradle.api.Project.

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.
> Get more help at https://help.gradle.org.

BUILD FAILED in 953ms
Running Gradle task 'assembleRelease'...                         1.604ms
Gradle task assembleRelease failed with exit code 1

当前配置文件 #

settings.gradle #

include ':app'
include ':firebase_core'
project(':firebase_core').projectDir = new File(rootProject.projectDir, '../../AppData/Local/Pub/Cache/hosted/pub.dev/firebase_core-3.9.0/android')

项目级build.gradle #

buildscript {
    ext {
        compileSdkVersion = 33
        minSdkVersion = 21
        targetSdkVersion = 33
    }

    repositories {
        google()
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:8.0.2'
        classpath 'com.google.gms:google-services:4.3.15'
    }
}

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

应用级build.gradle #

android {
    compileSdkVersion 33
    defaultConfig {
        applicationId "com.gustaga.app"
        minSdkVersion 21
        targetSdkVersion 33
        versionCode 1
        versionName "1.0"
    }

    buildTypes {
        release {
            signingConfig signingConfigs.debug
            minifyEnabled true
            shrinkResources true
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

flutter {
    source = "../.."
}

dependencies {
    implementation project(':firebase_core')
    implementation 'com.google.firebase:firebase-core:21.1.1'
    implementation 'com.google.firebase:firebase-database:20.0.5'
    implementation 'androidx.core:core-ktx:1.7.0'
    implementation 'androidx.appcompat:appcompat:1.4.1'
    implementation 'com.google.android.material:material:1.5.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.1.3'
    testImplementation 'junit:junit:4.13.2'
    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
}

firebase_core的build.gradle #

buildscript {
    repositories {
        google()
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:8.0.2'
    }
}

apply plugin: 'com.android.library'

android {
    compileSdkVersion 33

    defaultConfig {
        minSdkVersion 21
        targetSdkVersion 33
    }

    lintOptions {
        disable 'InvalidPackage'
    }
}

dependencies {
    implementation 'com.google.firebase:firebase-core:21.1.1'
}

解决步骤 #

1. 修正settings.gradle：移除手动添加的:firebase_core相关行，恢复为Flutter默认配置，示例如下：

   include ':app'
   apply from: "$flutterSdkPath/packages/flutter_tools/gradle/app_plugin_loader.gradle"
   

   （注：若使用Flutter新版本，settings.gradle可能采用plugins块结构，保持默认即可）

2. 通过pub管理依赖：确保pubspec.yaml中正确声明firebase_core依赖：

   dependencies:
     flutter:
       sdk: flutter
     firebase_core: ^3.9.0
   

   执行flutter pub get拉取依赖。

3. 清理应用级build.gradle：移除dependencies中的implementation project(':firebase_core')，Flutter插件会自动处理依赖关联。

4. 移除自定义firebase_core构建配置：删除手动修改的firebase_core本地build.gradle，使用pub下载的插件自带配置即可。

5. 重新构建：执行flutter clean后，再运行flutter build apk。

内容的提问来源于stack exchange，提问作者Cristian Osorio