Android studio Error:Execution failed for task ':app:preDebugAndroidTestBuild'错误的解决办法

android studio新建工程后出现如下错误

error:execution failed for task ':app:predebugandroidtestbuild'.

> conflict with dependency 'com.android.support:support-annotations' in project ':app'. resolved versions for app (26.1.0) and test app (27.1.1) differ. see 

解决办法：在 build.gradle 添加

android {
 ...
}

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

dependencies {
 ...
}