Warning:Conflict with dependency

在Android Studio  编译的时候，报错：

Warning:Conflict with dependency 'com.android.support:support-annotations'. Resolved versions for app (26.1.0) and test app (27.1.1) differ. See http://g.co/androidstudio/app-test-app-conflict for details.

解决办法：在 build.gradle 添加

configurations.all { resolutionStrategy.force'com.android.support:support-annotations:27.1.1'}