An important part of Teller is that it hopes that you make a positive experience of the UI of the app. Making Views in your app that tell the user the state of the cache is recommended.

But it can be a pain to make these Views as it's a pretty manual process. Let's make it easier for you.

Note: This is to create custom Views that show the state of Teller like, "Updating...", "Cache 5 seconds old". Not updating your RecyclerView with cache data.

Proposal

Make an interface that looks something like this:

interface TellerView {
  cacheState(...)
  cacheEmptyState(...)
  noCache(...)
}

You create any custom View in Android, inherit that interface, then when you get a cache state update, you send that to the View:

val newCacheState = ...
TellerView.updateViews(newCacheState, listOf(customView, ...))

Teller will parse the cache state and call the appropriate interface function for you.

Pros:

• No need to extend any special class. Just inherit an interface. Very flexible.
  • Use on any View including 3rd party Views or androidx views.
    Cons:
• Must call a Teller function, TellerView.updateViews... to perform the update. I would like to have it be more automated, but Teller has to know about your view somehow. I could do something more automated like Teller traversing a ViewGroup for children Views that inherit an interface but I like how this is more flexible. You decide what Views get updated, when.