Conflict with dependency 'com.android.support:support-annotations' in project ':app'. Resolved versi

问题 ：

新建AS遇到项目

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 
https://d.android.com/r/tools/test-apk-dependency-conflicts.html for details.

解决：

在app目录下的build.gradle 文件里的android{   } 里面加上下面一句

 configurations.all {
        resolutionStrategy.force 'com.android.support:support-annotations:26.1.0'
    }

问题就没了