因smart_auth包依赖导致Flutter应用构建失败求助

运行Flutter应用时无法完成assembleDebug阶段，终端报错核心信息如下：

Launching lib\main.dart on sdk gphone64 x86 64 in debug mode...

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring project ':smart_auth'.
> Could not resolve all files for configuration ':smart_auth:classpath'.
   > Could not download gradle-4.1.3.jar (com.android.tools.build:gradle:4.1.3)
      > Could not get resource 'https://dl.google.com/dl/android/maven2/com/android/tools/build/gradle/4.1.3/gradle-4.1.3.jar'.
         > Could not GET 'https://dl.google.com/dl/android/maven2/com/android/tools/build/gradle/4.1.3/gradle-4.1.3.jar'.
            > Connect to dl.google.com:443 [dl.google.com/172.217.170.174] failed: Connection timed out: connect

   /* Many similar could not GET links */

   > Could not get unknown property 'android' for project ':smart_auth' of type org.gradle.api.Project.
   > Could not get unknown property 'android' for project ':smart_auth' of type org.gradle.api.Project.

近期新增pinput: ^2.2.31包后触发该问题，smart_auth是其依赖项。当前环境：Flutter 3.7.7、Dart 2.19.4，flutter doctor检测无异常。

相关配置文件 #

android\build.gradle #

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"
    }
}

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

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

task clean(type: Delete) {
    delete rootProject.buildDir
}

android\app\build.gradle #

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 new 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"

android {
    compileSdkVersion flutter.compileSdkVersion
  

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

    kotlinOptions {
        jvmTarget = '1.8'
    }

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

    defaultConfig {
        applicationId "com.example"
        minSdkVersion 18
        targetSdkVersion flutter.targetSdkVersion
        versionCode flutterVersionCode.toInteger()
        versionName flutterVersionName
    }

    buildTypes {
        release {
            signingConfig signingConfigs.debug
        }
    }
}

flutter {
    source '../..'
}

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
}

android\gradle\wrapper\gradle-wrapper.properties #

distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-7.4-all.zip

android\gradle.properties #

org.gradle.jvmargs=-Xmx1536M
android.useAndroidX=true
android.enableJetifier=true

pubspec.yaml #

version: 1.0.0+1

environment:
  sdk: '>=2.18.6 <3.0.0'

dependencies:
  flutter:
    sdk: flutter
  cupertino_icons: ^1.0.2
  get: ^4.6.1
  google_fonts: ^4.0.3
  flutter_screenutil: ^5.1.1
  flutter_dotenv: ^5.0.2
  get_storage: ^2.0.3
  persistent_bottom_nav_bar: ^5.0.2
  jiffy: ^6.1.0
  permission_handler: ^10.2.0
  mockito: ^5.1.0
  loader_overlay: ^2.0.6
  intl: ^0.18.0
  fluttertoast: ^8.2.1
  material_design_icons_flutter: ^6.0.7096
  url_launcher: ^6.1.10
  freezed_annotation: ^2.2.0
  json_annotation: ^4.8.0
  flutter_secure_storage: 7.0.1
  http: ^0.13.5
  flutter_svg: ^2.0.4
  cached_network_image: ^3.2.3
  internet_connection_checker: ^1.0.0+1
  simple_animations: ^5.0.0+3
  pinput: ^2.2.31

dev_dependencies:
  flutter_test:
    sdk: flutter
  flutter_lints: ^2.0.0
  build_runner: ^2.1.10
  freezed: ^2.3.2
  json_serializable: ^6.6.1
  flutter_launcher_icons: ^0.12.0

解决方案 #

1. 修复网络连接问题 #

• 确认网络可正常访问dl.google.com，若身处受限环境，切换稳定网络或配置Gradle代理
• 执行flutter clean清除构建缓存，再运行flutter pub get重新拉取依赖
• 手动下载gradle-4.1.3.jar，放入本地Gradle仓库对应路径：~/.gradle/caches/modules-2/files-2.1/com.android.tools.build/gradle/4.1.3/

2. 统一子项目Gradle配置 #

修改android/build.gradle，合并重复的subprojects块并添加统一配置，强制smart_auth使用项目兼容的Gradle和Android参数：

rootProject.buildDir = '../build'
subprojects {
    project.buildDir = "${rootProject.buildDir}/${project.name}"
    project.evaluationDependsOn(':app')
    
    // 统一Kotlin版本和Android配置
    project.ext {
        set('kotlin_version', '1.6.10')
    }
    
    afterEvaluate { project ->
        if (project.hasProperty('android')) {
            android {
                compileSdkVersion flutter.compileSdkVersion
                defaultConfig {
                    minSdkVersion 18
                }
            }
        }
    }
}

3. 升级pinput依赖 #

尝试将pinput升级到最新稳定版，新版本可能修复了smart_auth的依赖兼容问题：
修改pubspec.yaml中pinput版本为最新版（如^3.0.0），执行flutter pub upgrade pinput

4. 确认Gradle wrapper完整性 #

检查本地是否已下载gradle-7.4-all.zip，若未下载，手动下载后放入~/.gradle/wrapper/dists/gradle-7.4-all/目录

5. 强制指定兼容的smart_auth版本 #

若上述方法无效，直接在pubspec.yaml中指定与项目Gradle兼容的smart_auth版本：

dependencies:
  pinput: ^2.2.31
    exclude:
      dependency: smart_auth
  smart_auth: ^0.7.0 # 选择兼容Gradle 7.1.2的版本

内容的提问来源于stack exchange，提问作者Derrick Mwangi