Dagger @modules and @BINDS

dagger-modules-bind.md

MainActivity

client = DaggerClientComponent.create().client()
"🟢 ${client.fetchData()}"

DI

@Component(modules = [ConnectionModule::class])
interface ClientComponent{
    fun client(): Client
}

@Module
interface ConnectionModule {
    @Binds
    fun bindConnection(networkConnection: NetworkConnection): Connection
}

Classes

interface Connection {
    fun doReq(): String
}

class NetworkConnection @Inject constructor() : Connection {

    val endpoint = if (BuildConfig.DEBUG) {
        "DEBUG/endpoint"
    } else {
        "PROD/endpoint"
    }

    override fun doReq() = endpoint
}

class Client @Inject constructor(
    private val connection: Connection
) {
    fun fetchData() = connection.doReq()
}