错误提示：
Error:Execution failed for task ':app:lintVitalRelease'.
> Could not resolve all artifacts for configuration ':app:debugAndroidTestRuntimeClasspath'.
> Could not resolve com.android.support.test:runner:1.0.2.
Required by:
project :app
> Could not resolve com.android.support.test:runner:1.0.2.
> Could not get resource 'https://dl.google.com/dl/android/maven2/com/android/support/test/runner/1.0.2/runner-1.0.2.pom'.
> Could not GET 'https://dl.google.com/dl/android/maven2/com/android/support/test/runner/1.0.2/runner-1.0.2.pom'.
> Connect to dl.google.com:443 [dl.google.com/127.0.0.1] failed: Connection refused: connect
> Could not resolve com.android.support.test.espresso:espresso-core:3.0.2.
Required by:
project :app
> Could not resolve com.android.support.test.espresso:espresso-core:3.0.2.
> Could not get resource 'https://dl.google.com/dl/android/maven2/com/android/support/test/espresso/espresso-core/3.0.2/espresso-core-3.0.2.pom'.
> Could not GET 'https://dl.google.com/dl/android/maven2/com/android/support/test/espresso/espresso-core/3.0.2/espresso-core-3.0.2.pom'.
> Connect to dl.google.com:443 [dl.google.com/127.0.0.1] failed: Connection refused: connect
解决方法，在Project的build.gradle里的allprojects里添加：
maven { url 'http://maven.aliyun.com/nexus/content/groups/public/' }