Caused by: org.gradle.api.GradleException: Compilation error. See log for more details

e: Supertypes of the following classes cannot be resolved. Please make sure you have the required dependencies in the classpath:
class android.support.v4.app.FragmentActivity, unresolved supertypes: android.support.v4.app.ActivityCompat.RequestPermissionsRequestCodeValidator

问题如上，最终是通过把RecyleView的版本改为和appcompact一致解决的，具体为什么出现这个问题还不清楚。