Listener,
Interface,
Handler.
They all sound similar but they must be different.
Maybe ‘delegate’ in objective-c as well.
Listener, Interface, Handler. They all sound similar but they must be different. Maybe ‘delegate’
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Listener,
Interface,
Handler.
They all sound similar but they must be different.
Maybe ‘delegate’ in objective-c as well.
Interface:
interfaceare used to provide roles. According to Design Patterns when there are certain behaviors that keeps changing must be encapsulated in aninterfaceor anabstract class.Eg:
Suppose there is this
paint class, which has a methodpaintIt().Now the method
paintIt()can be free-hand, shading etc, so its kind of behavior which keeps changing. So we need to encapsulate it in aninterfaceor anabstract class.Listener:
Listenersare the interface that listens to certain action, and they contains the call back methods, which has the logic that is to be fired when that particular action is done.Handler:
Handlersin android are used to post the data from the Non-UI thread to the UI thread.