NERoomService constructor Null safety

1. netease_roomkit
2. netease_roomkit
3. NERoomService
4. NERoomService constructor

NERoomService class

1. Constructors
2. NERoomService
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. createRoom
8. getRoomContext
9. joinRoom
10. noSuchMethod
11. previewRoom
12. toString
13. Operators
14. operator ==