如何修复错误：没有方法签名：build_754ga1wplg93aizkkd14wn52w.android()

Question

Gradle 同步失败：没有方法签名：build_754ga1wplg93aizkkd14wn52w.android() 适用于参数类型：(build_754ga1wplg93aizkkd14wn52w$_run_closure2) 值：[build_754ga1wplg93aizkkd14wn52w$_run_closure2@4657e4e8]

构建等级是：

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 FileNotFoundException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
}

def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
if (flutterVersionCode == null) {
    flutterVersionCode = '2'
}

def flutterVersionName = localProperties.getProperty('flutter.versionName')
if (flutterVersionName == null) {
    flutterVersionName = '1.0.2'
}

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


android {
    defaultConfig {
        minSdkVersion(15)
        targetSdkversion(29)
        multiDexEnabled = true
    }
    compileSdkVersion 30

    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.flutter_blog"
        minSdkVersion 16
        compileSdkversion 30
        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
        }
    }
    buildToolsVersion '30.0.3'
}

flutter {
    source '../..'
}

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation platform('com.google.firebase:firebase-bom:28.1.0')
    implementation 'com.google.firebase:firebase-analytics'
    implementation("androidx.multidex:multidex:2.0.1")
    implementation 'com.google.android.material:material:1.4.0-rc01'
}

Android Studio 4.2.1 构建 #AI-202.7660.26.42.7351085，构建于 2021 年 5 月 10 日 运行时版本：11.0.8+10-b944.6842174 amd64 虚拟机：OpenJDK 64 位服务器虚拟机（不适用） 视窗 10 10.0 GC：G1年轻代，G1老年代 内存：1280M 核心数：12 注册表：external.system.auto.import.disabled=true 非捆绑插件：Dart、org.jetbrains.kotlin、io.flutter

Answer 1

当您在 :app build gradle 中写入不必要的详细信息时，通常会发生此错误。

您在android{ ... } 中添加了两个defaultconfig。您必须删除第一个 defaultConfig。

这就是你的android{ ... } 现在的样子：

android {
    defaultConfig {
        minSdkVersion(15)
        targetSdkversion(29)
        multiDexEnabled = true
    }
    compileSdkVersion 30

    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.flutter_blog"
        minSdkVersion 16
        compileSdkversion 30
        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
        }
    }
    buildToolsVersion '30.0.3'
}

相对于它的外观：

android {
    
    compileSdkVersion 30

    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.flutter_blog"
        minSdkVersion 16
        compileSdkversion 30
        multiDexEnabled true // Since you wanted to use multiDex this is where you put it
        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
        }
    }
    buildToolsVersion '30.0.3'
}

同样在dependencies{} 中将implementation("androidx.multidex:multidex:2.0.1") 更改为implementation "androidx.multidex:multidex:2.0.1" 这应该可以解决您的问题。

对于遇到此问题的其他人，请彻底检查您的 :app build gradle 是否存在不必要的缩进和错误的命名约定。