How to use Hilt with DatabindingComponent?

Hello,

I have switched over to Hilt for DI. Everything works like a charm. However, I have only an issue with Databinding Adapters to generate them with Hilt. I was able to use DatabindingComponent and converting my objects into classes. Can you help me have the insight to work on the same with Hilt?

Dagger way

BindingComponent

@BindingScope
@Subcomponent(modules = [BindingModule::class])
interface BindingComponent : DataBindingComponent {

    @Subcomponent.Factory
    interface Factory {
        fun create(): BindingComponent
    }

    override fun getImageBindingAdapter(): ImageBindingAdapter

    override fun getTextBindingAdapter(): TextBindingAdapter
}

BindingModule

@Module
internal object BindingModule {

    private const val DEFAULT_MEMORY_MULTIPLIER = 0.5

    @Provides
    @BindingScope
    internal fun provideImageLoader(context: Context) = ImageLoader.Builder(context).apply {
        bitmapPoolPercentage(DEFAULT_MEMORY_MULTIPLIER)
        availableMemoryPercentage(DEFAULT_MEMORY_MULTIPLIER)
        crossfade(true)
    }.build()

    @Provides
    @InternalApi
    @BindingScope
    internal fun provideImageBindingAdapter(
        imageLoader: ImageLoader
    ) = ImageBindingAdapter(imageLoader)

    @Provides
    @InternalApi
    @BindingScope
    internal fun provideTextBindingAdapter() = TextBindingAdapter()
}

@Scope
@MustBeDocumented
internal annotation class BindingScope

@Qualifier
@Retention(AnnotationRetention.BINARY)
@MustBeDocumented
private annotation class InternalApi

ImageBindingAdapter

@BindingScope
class ImageBindingAdapter @Inject constructor(private val imageLoader: ImageLoader) {

    @BindingAdapter("android:src")
    fun ImageView.bindImage(url: String?) {
        load(url, imageLoader) {
            fallback(R.drawable.ic_error)
            transformations(CircleCropTransformation())
            size(IMAGE_WIDTH_SIZE_DEFAULT, IMAGE_HEIGHT_SIZE_DEFAULT)
            build()
        }
    }

    private companion object {
        private const val IMAGE_WIDTH_SIZE_DEFAULT = 200
        private const val IMAGE_HEIGHT_SIZE_DEFAULT = 200
    }
}

Hilt Way

@Module
@InstallIn(DataBindingComponent::class)
class BindingModule {}

Error trace

/path-to-project/app/build/tmp/kapt3/stubs/debug/io/github/nuhkoca/project-name/binding/BindingModule.java:5: error: cannot find symbol
@dagger.hilt.InstallIn(value = {DataBindingComponent.class})
                                ^
symbol: class DataBindingComponenterror: [Hilt]
@InstallIn, 'value' class is invalid or missing: @dagger.hilt.InstallIn({<error>})
[Hilt] Processing did not complete. See error above for details./path-to-project/app/build/tmp/kapt3/stubs/debug/io/github/nuhkoca/project-name/binding/BindingModule.java:8: error: [ComponentProcessor:MiscError] dagger.internal.codegen.ComponentProcessor was unable to process this class because not all of its dependencies could be resolved. Check for compilation errors or a circular dependency with generated code.
public final class BindingModule {
class BindingModule {}

[nuhkoca]

@dmapr ohh I am seeing a very beneficial corresponding out there! Thank you for clarifying this point with the authors 😃 I will definitely update my repository. It is great to see how to properly work with Hilt for DataBinding! Thanks again.

[dmapr]

@nuhkoca — @bcorso pointed out the correct way of setting up the custom binding component in the https://github.com/google/dagger/issues/2603, you may want to check it out.