Conflict with dependency 'com.android.support:support-annotations' in project ':app'.包冲突

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问题报错：

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.

问题分析：

com.android.support:support-annotations:26.1.0@jar 和 com.android.support:support-annotations:27.1.1@jar冲突

解决：

在app下的build.gradle文件中的dependences {}中添加如下代码

androidTestCompile('com.android.support:support-annotations:26.1.0') {
    force = true
}