when will reflectionClassName will be minifed in Android Proguard

Android progurd

In my jar/aar，there is an reflectionCode like this 、、、Java Class.forName("com.mm.sdk.video.a.b") 、、、

but in develpoer Android Project,it turns out to be 、、、Java Class.forName("b") 、、、

so it crashed by "ClassNotFoundException"

when will reflectionClassName will be minifed in Android Proguard ?