FragmentBindingModule.kt

@Module
abstract class FragmentBindingModule {

    @Binds
    abstract fun bindFragmentFactory(factory: FragmentInjectionFactory): FragmentFactory

    @Binds
    @IntoMap
    @FragmentKey(MainFragment::class)
    abstract fun bindMainFragment(fragment: MainFragment): Fragment
}

FragmentInjectionFactory.kt

/**
 * [FragmentFactory] class that takes a map of [Fragment] classes and related
 * Dagger [Provider] instances to create new [Fragment] instances using dependency injection
 */
@ActivityScope
class FragmentInjectionFactory @Inject constructor(
        private val creators: Map<Class<out Fragment>, @JvmSuppressWildcards Provider<Fragment>>
) : FragmentFactory() {

    override fun instantiate(classLoader: ClassLoader, className: String, args: Bundle?): Fragment {
        val fragmentClass = loadFragmentClass(classLoader, className)
        val creator = creators[fragmentClass]
                ?: throw IllegalArgumentException("Unknown fragment class $fragmentClass")

        try {
            val fragment = creator.get()
            fragment.arguments = args
            return fragment
        } catch (e: Exception) {
            throw RuntimeException(e)
        }
    }
}