今天遇到了一下问题
```
When converting this project as a library, facing Error:Execution failed for task ':app:preDebugBuild'. > Android dependency 'android.arch.lifecycle:runtime' has different version for the compile (1.0.0) and runtime (1.0.3) classpath. You should manually set the same version via DependencyResolution. #1615
```
gradle 升级 26 到27 就可以了