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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 for details. Information:Gradle tasks [:app:generateDebugSources, :app:generateDebugAndroidTestSources, :app:mockableAndroidJar]
解决方案：在此行添加gradle模块的依赖项
compile 'com.android.support:support-annotations:27.1.1'如果您使用的是Android工作室3+改变compile到implementation转载于:https://blog.51cto.com/13652962/2355175