android - How to pass the class type -

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i trying remake 1 library.i need pass class type object, , cast variable type. trying 

public class baseactivity extends fragmentactivity {     class<? extends application> appclass;      public void setappclass(class<? extends application> c) {         appclass = c;     }      protected socialprovidermanager getsocialprovidermanager() {         return ((appclass) getapplication()).getsocialprovidermanager();     } }

another class 

public class gameapplication extends application {          private socialprovidermanager socialprovidermanager;          public socialprovidemanager getsocialprovidermanager()         {             return socialprovidermanager         }         @override         public void oncreate() {             super.oncreate();             baseactivity.setappclass(this);          }     }

how make construction work. thanks.


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