失败：构建失败，并出现异常。
What went wrong:
A problem occurred configuring root project 'Digital'.
Could not resolve all artifacts for configuration ':classpath'.
Could not resolve com.android.tools.build:gradle:3.2.1.
Required by:
project :
Could not resolve com.android.tools.build:gradle:3.2.1.
> Could not get resource 'https://dl.google.com/dl/android/maven2/com/android/tools/build/gradle/3.2.1/gradle-3.2.1.pom'.
> Could not GET 'https://dl.google.com/dl/android/maven2/com/android/tools/build/gradle/3.2.1/gradle-3.2.1.pom'.
> sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
* 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
CONFIGURE FAILED in 11s
Cause: unable to find valid certification path to requested target