ProgramListener constructor Null safety

1. jrpn
2. model
3. ProgramListener
4. ProgramListener constructor

ProgramListener class

1. Constructors
2. ProgramListener
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. noSuchMethod
8. onDone
9. onError
10. onErrorShown
11. onPause
12. onRS
13. onStop
14. resumeFromPause
15. toString
16. Operators
17. operator ==