1. Error:Execution failed for task ':app:preFUNDebugAndroidTestBuild'.
2. >Conflictwith dependency 'com.android.support:support-annotations' in project ':app'. Resolved versions for app (26.1.0) and test app (27.1.1)differ.
3. See https://d.android.com/r/tools/test-apk-dependency-conflicts.html for details.

在build.gradle的dependencies下添加一段话：

configurations.all {

        resolutionStrategy.force 'com.android.support:support-annotations:26.1.0'

    }