How to /unregister a custom view (from xml) automatically on a bus

Question

I have a custom EditText View. It extends the default one and adds the ability to show a TimePickerDialogFragment, a NumberPickerDialogFragment and similar...

All my FragmentDialogs are working with a bus system, to make the reattaching to the parent activity unneccessary...

Normally, I register all objects on creation and unregister them in the onPause of their parent activity... I use a scoped bus for that, which saves references to all registered objects and unregisters them automatically in the onPause of the activity. That work's optimal so far. All my custom classes use a constructor, which receive a reference to the scoped bus... So the class only has to register itself on the scoped bus and does not need to unregister itself anymore, the scoped bus will do that automatically.

Now registering my custom edittext is no problem, but how to automatically unregister it? I'm adding the views in XML and I don't want to have to add all of them manually to my scoped bus.

Does anyone have an idea how the unregistering could be somehow automated?

Answer 1

Since you are using Otto. You could take a look how they are finding @Subscribe methods: https://github.com/square/otto/blob/master/library/src/main/java/com/squareup/otto/AnnotatedHandlerFinder.java

From the design point of view (IMO) your view are mixing two responsibilities - some UI representation and communicating with lower system layers. The common sense rule - class is responsible for one thing only.

You can think about this from other point of view. It will be much harder to reuse such components in any project that doesn't use bus. Think about your internal design like you are going to open source your system components.