Error:Execution failed for task ':app:preDebugAndroidTestBuild'.
Conflict with dependency 'com.android.support:support-annotations' in project ':app'. Resolved versions for app (27.0.2) and test app (27.1.1) differ. See d.android.com/r/tools/tes… for details.
解决方案1：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 }
解决方案2：androidTestImplementation('com.android.support.test.espresso:espresso-core:3.0.2') 编译版本改为2.2.2。 删除 androidTestImplementation 'com.android.support.test:runner:1.0.2'
最后我的配置如下
