DataClassAdapter

//Adapter for RecyclerView, that displays contents of kotlin data class using reflection (or in theory just public properties of a class).

import kotlin.reflect.KClass
import kotlin.reflect.KProperty1
import kotlin.reflect.KVisibility
import kotlin.reflect.full.memberProperties


val <T : Any> KClass<T>.publicProperties: Collection<KProperty1<T, *>>
    get() = memberProperties.filter { it.visibility == KVisibility.PUBLIC }


class DataClassAdapter<T : Any>(val data: T) : RecyclerView.Adapter<DataClassAdapter.MyViewHolder>() {
    private val properties: List<KProperty1<*, *>>

    init {
        properties = data::class.publicProperties.toList()
    }


    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyViewHolder {
        val textView = LayoutInflater.from(parent.context)
                .inflate(R.layout.row, parent, false) as TextView
        return MyViewHolder(textView)
    }

    override fun getItemCount(): Int {
        return properties.size
    }

    override fun onBindViewHolder(holder: MyViewHolder, position: Int) {
        val property = properties[position]
        val value = property.getter.call(data)
        onBindViewHolder(holder, property.name, value)
    }

    fun onBindViewHolder(holder: MyViewHolder, name: String, value: Any?) {
        holder.textView.text = name + " - " + value.toString()
    }

    class MyViewHolder(val textView: TextView) : RecyclerView.ViewHolder(textView)


}