Resolved versions for app (26.1.0) and test app (27.1.1) differ.

Error:Execution failed for task ‘:modulea:preDebugAndroidTestBuild’.

Conflict with dependency ‘com.android.support:support-annotations’ in project ‘:modulea’. 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.

最近项目报错：

Conflict with dependency 'com.android.support:support-annotations' in project ':modulea'. Resolved versions for app (26.1.0) and test app (27.1.1) differ.

解决方案：
1、在你报错的in progect :modulea的 build.gradle中。在android{}前，加一句话
如下：

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

参考：https://blog.csdn.net/qq_29881229/article/details/80589734