correctErrorTypes causes DataBindingComponent compile errors

Not sure whether this is Hilt, Kapt or both, but I was migrating a project from Dagger Android to Hilt and followed the guide by @nuhkoca in https://github.com/google/dagger/issues/2030. However my project refused to compile the generated custom data binding component implementation. I found that a Github repo was created based on @nuhkoca’s gist and was able to narrow it down to this option. I’ve forked the project to demonstrate the problem to https://github.com/dmapr/HiltDataBindingSample, look in app/build.gradle

[bcorso]

Thanks! The override issue does indeed look like #665. So just to wrap things up, the main takeaways are:

1. Use correctErrorTypes = true
2. Extend an entry point with DataBindingComponent instead of extending the @DefineComponent type directly (Example: https://github.com/google/dagger/issues/2603#issuecomment-840740622).
3. There’s an issue of needing to override the methods in DataBindingComponent, but this is covered by #665.

If that all sounds correct, then I think we can close this issue now since there’s nothing for us to do outside of #665.

[bcorso]

So I guess now for the real question — what’s the best way to handle DataBindingComponent with Hilt? Just use a plain Dagger component as before the migration?

Rather than having the @DefineComponent extend DataBindingComponent you can have your entry point extend it, which is effectively the same thing.

@EntryPoint
@InstallIn(CustomBindingComponent::class)
interface CustomBindingEntryPoint: DataBindingComponent {
   override fun getImageBindingAdapter(): ImageBindingAdapter
}

(Note: technically, you shouldn’t need the override since Dagger should see the method defined in DataBindingComponent. However, it’s likely related with DataBindingComponent not being generated yet. I’ll have to look further to see if there’s anything we can do about it on our side).

Then, to set the data binding component you can use EntryPoints:

DataBindingUtil.setDefaultComponent(
    EntryPoints.get(bindingComponentProvider.get().build(), CustomBindingEntryPoint::class.java))

Or if you really want you can just cast:

DataBindingUtil.setDefaultComponent(bindingComponentProvider.get().build() as DataBindingComponent)