Error:Execution failed for task

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.

解决方法：
在app gradle 中添加如下

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

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