Android Studio：Gradle 构建错误未定义存储库

Question

安卓工作室 3.3.1

4.4 级

我通过 Android > Tools > Firebase 选项添加了 Firebase 存储。但是，当我同步 gradle 时，构建失败。这是我得到的错误：

Cannot resolve external dependency com.google.gms:google-services:3.2.1 
because no repositories are defined. Required by:project :app

有谁知道如何纠正这个错误？

build.gradle（模块：APP）

apply plugin: 'com.android.application'

android {
compileSdkVersion 27
defaultConfig {
    applicationId "com.example.test"
    minSdkVersion 16
    targetSdkVersion 27
    versionCode 1
    versionName "1.0"
    testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}
compileOptions {
    targetCompatibility 1.8
    sourceCompatibility 1.8
}
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:27.1.1'
    implementation 'com.android.support.constraint:constraint-layout:1.1.0'
    implementation 'com.android.support:support-v4:27.1.1'
    implementation 'com.google.firebase:firebase-core:15.0.0'
    implementation 'com.google.firebase:firebase-storage:15.0.0'
    implementation 'com.google.firebase:firebase-auth:15.0.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.1'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
    implementation 'com.android.support:design:27.1.1'
    //implementation 'com.google.android.gms:play-services:11.0.4'
}

buildscript {
    dependencies {
        classpath 'com.google.gms:google-services:3.2.1'
    }
}

apply plugin: 'com.google.gms.google-services'

Answer 1

就我而言，我必须将以下代码添加到项目级别的 gradle 中：

allprojects {
    repositories {
        google()
        jcenter()

    }
}

Answer 2

该错误表明repositories缺少该文件，无法确定从何处google-services下载。

buildscript {
    repositories {
       jcenter()
    }
    dependencies {
        classpath 'com.google.gms:google-services:3.2.1'
    }
}

jcenter是对bintray jcenter的引用。Gradle 可以在那里找到google-services:3.2.1。