Android Studio 无法解析 Espresso 3.0.0

Question

根据Android Espresso documentation迄今为止:

Add Espresso dependencies

To add Espresso dependencies to your project, complete the following steps:

1. Open your app’s build.gradle file. This is usually not the top-level build.gradle file but app/build.gradle.
2. Add the following lines inside dependencies:
   

androidTestCompile 'com.android.support.test.espresso:espresso-core:3.0.0'
androidTestCompile 'com.android.support.test:runner:1.0.0'

我新建了一个项目，生成的app/gradle文件是这样的:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 26
    buildToolsVersion "26.0.0"
    defaultConfig {
        applicationId "com.app.test"
        minSdkVersion 24
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:26.+'
    testCompile 'junit:junit:4.12'
}

当我将其更改为以下内容时:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 26
    buildToolsVersion "26.0.0"
    defaultConfig {
        applicationId "com.app.test"
        minSdkVersion 24
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:26.+'
    testCompile 'junit:junit:4.12'
    // App's dependencies, including test
    compile 'com.android.support:support-annotations:22.2.0'

    // Testing-only dependencies
    androidTestCompile 'com.android.support.test:runner:1.0.0'
    androidTestCompile 'com.android.support.test.espresso:espresso-core:3.0.0'
}

我收到以下错误:

Error:(29, 24) Failed to resolve: com.android.support.test:runner:1.0.0
    Install Repository and sync project
Error:(30, 24) Failed to resolve: com.android.support.test.espresso:espresso-core:3.0.0
    Install Repository and sync project

我尝试点击“安装存储库和同步项目”链接，但没有任何反应。我也试过查看 SDK 管理器，但我真的看不到任何东西。

Answer 1

由于评论的解决方案正在解决问题，我将其添加为其他人的答案:

一定要加上Google's maven链接到主 build.gradle 文件:

allprojects {
    repositories {
        jcenter()
        maven {
            url "https://maven.google.com"
        }
    }
}