Introduce a view binding function that works with AndroidX ViewBindings.

[zach-klippenstein]

Initially proposed by @0legg.

Closes #984.

val HelloBinding: ViewBinding<HelloWorkflow.Rendering> =
  bindViewBinding(HelloGoodbyeLayoutBinding::inflate) { rendering, containerHints ->
    helloMessage.text = rendering.message
    helloMessage.setOnClickListener { rendering.onClick }
  }

[rjrjr]

I messed with the kdoc a bit, and suggested slightly different packaging for the anonymous binding method.

We really need to find a non-conflicting name for our own ViewBinding class, but let's address that after this lands.

[rjrjr]

Shouldn't the need for this gradle config be called out in the kdoc?

[0legg]

It definitely should

[zach-klippenstein]

It should be if we want to recommend ViewBinding as the best practice. I was thinking of this more as "if you want to use ViewBinding, we'll make it easy for you", and "if you want to use ViewBinding" implies that you know how to turn it on. But I would not be opposed to recommending ViewBinding as the default over raw views.

[zach-klippenstein]

Looks like a legit UI test failure.

[0legg]

So far it looks good to me. We definitely should rename Workflow's very own ViewBinding, because we've already had been confused multiple times internally, and who knows how tricky this terminology will be externally. I feel Android View Binding is ready for production use – it's actually slimmed down Data Binding, and Data Binding is stable for a long time.

[zach-klippenstein]

ViewBinding rename is filed as #988.

[zach-klippenstein]

Do any of the other current samples do the kind of pre-render setup that would justify LayoutRunner + Binding

@rjrjr I've already found a few.

[zach-klippenstein]

I'm going to only convert the HelloWorkflow sample in this PR, and then convert all the other samples in a follow-up so it doesn't block the 0.24.0 branch cut. See #1012.

[rjrjr]

Wow, I'm thrilled with this.