How to find a list of active views in an Oracle schema?

I don't really know what you mean by "active"

The dba_objects, all_views and other sys tables included the dropped views as well


I don't what you mean by this either. Dropped objects don't appear in those views ?

SQL> create view my_view as select * from dual;

View created.

SQL> select count(*) from dba_objects where object_name = 'MY_VIEW';

  COUNT(*)
----------
         1

SQL> drop view my_view;

View dropped.

SQL> select count(*) from dba_objects where object_name = 'MY_VIEW';

  COUNT(*)
----------
         0

Perhaps take a look at v$segment_statistics. Maybe that is what you are after ?