NewsListFragment.kt

package com.mobymagic.veryquicknewsaggregator

import android.support.v4.app.Fragment
import android.support.v7.widget.DividerItemDecoration
import android.support.v7.widget.LinearLayoutManager
import android.support.v7.widget.RecyclerView
import android.view.LayoutInflater
import android.view.ViewGroup
import com.google.firebase.database.DatabaseError
import com.google.firebase.database.FirebaseDatabase
import com.google.firebase.database.Query
import com.mobymagic.easyfirebaselist.EmptyStyle
import com.mobymagic.easyfirebaselist.ErrorStyle
import com.mobymagic.easyfirebaselist.ProgressStyle
import com.mobymagic.easyfirebaselist.database.FirebaseDbListFragment
import com.thefinestartist.finestwebview.FinestWebView

/**
 * A simple [Fragment] subclass.
 */
class NewsListFragment : FirebaseDbListFragment<News, NewsViewHolder>() {

    override fun getDataClass(): Class<News> {
        return News::class.java
    }

    override fun getEmptyStyle(): EmptyStyle {
        return EmptyStyle(R.drawable.ic_error_view_cloud, "No news yet in database")
    }

    override fun getErrorStyle(error: DatabaseError): ErrorStyle {
        return ErrorStyle(R.drawable.ic_error_view_cloud, "An error occurred while fetching news")
    }

    override fun getProgressStyle(): ProgressStyle {
        return ProgressStyle("Loading...")
    }

    override fun getQuery(): Query {
        return FirebaseDatabase.getInstance().reference.child("news").limitToLast(100)
    }

    override fun onBindViewHolder(viewHolder: NewsViewHolder, key: String, model: News) {
        viewHolder.bind(model)
    }

    override fun onCreateViewHolder(inflater: LayoutInflater, viewGroup: ViewGroup): NewsViewHolder {
        val view = inflater.inflate(R.layout.item_news, viewGroup, false)
        return NewsViewHolder(view)
    }

    override fun onItemClicked(viewHolder: NewsViewHolder, key: String, model: News) {
        FinestWebView.Builder(activity).show(model.link)
    }

    override fun setupRecyclerView(recyclerView: RecyclerView) {
        recyclerView.addItemDecoration(DividerItemDecoration(activity, DividerItemDecoration.VERTICAL))
        recyclerView.layoutManager = LinearLayoutManager(activity)
    }
    
}

Overload FirebaseDbListFragment issue