Could not resolve all files for configuration ':app:debugCompileClasspath'.解決方案

異常以下：

Error:FAILURE: Build failed with an exception.

* What went wrong:
Could not resolve all files for configuration ':app:debugCompileClasspath'.
> Could not resolve com.google.android.gms:play-services-ads:latest.release.
Required by:
project :app
> Could not resolve com.google.android.gms:play-services-ads:12.0.1.
> Could not get resource 'https://jcenter.bintray.com/com/google/android/gms/play-services-ads/12.0.1/play-services-ads-12.0.1.pom'.
> Could not GET 'https://jcenter.bintray.com/com/google/android/gms/play-services-ads/12.0.1/play-services-ads-12.0.1.pom'.
> Read timed out

* 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 35s
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解決方案以下：
在project級別下的build.gradle文件中添加以下代碼：

buildscript {

repositories {
google()
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:3.1.1' //這裏不用和我同樣，和你項目裏面的版本同樣就行
classpath 'com.google.gms:google-services:4.0.1' //這行對谷歌服務庫進行依賴

}
}

allprojects {
repositories {
google()
jcenter()
mavenCentral ()
maven {url 'https://dl.bintray.com/jetbrains/anko'} //這是你須要加入的，這個是解決這個問題的關鍵地方，我就是添加這個maven後再也不報上面的錯誤了
maven {url "https://maven.google.com"} //谷歌廣告
}
}