Kotlin + Anko + ButterKnife: helper for async adapter for ListView

ListAdapter.kt

package com.github.kotlin.lib

import android.content.Context
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.ArrayAdapter
import butterknife.ButterKnife


abstract class ListAdapter<T>(ctx: Context, private val itemView: Int, items: ArrayList<T>) : ArrayAdapter<T>(ctx, 0, items) {

    override fun getView(position: Int, convertView: View?, parent: ViewGroup?): View {
        val item:T = getItem(position)
        val view: View = convertView ?: (LayoutInflater.from(context))!!.inflate(itemView, parent, false)
        ButterKnife.bind(this, view)
        fulfillView(view, item)
        return view
    }

    abstract fun fulfillView(view: View, item: T)
}

Wherever you need adapter for list (in the example below, the Topic is data object representing an item), you can make it easier, with ButterKnife bindings included:

class ItemsListAdapter(ctx: Context, items: ArrayList<Topic>) : ListAdapter<Topic>(ctx, R.layout.category_item, items) {
    @BindView(R.id.title)
    lateinit var title: TextView

    override fun fulfillView(view: View, item: Topic) {
        title.text = item.title
    }
}