ScrollAdapter.kt

ScrollAdapter.kt

package com.dennis.doublepull.adapter

import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.recyclerview.widget.RecyclerView

import com.dennis.doublepull.R

class ScrollAdapter : RecyclerView.Adapter<RecyclerView.ViewHolder>() {

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
        return if (viewType == TYPE_HEADER) {
            HeaderViewHolder(LayoutInflater.from(parent.context)
                    .inflate(R.layout.header, parent, false))

        } else ScrollViewHolder(LayoutInflater.from(parent.context)
                .inflate(R.layout.item, parent, false))
    }

    override fun getItemViewType(position: Int): Int {
        return if (position == 0) {
            TYPE_HEADER
        } else TYPE_NORMAL
    }

    override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
        // do nothing
    }

    override fun getItemCount(): Int {
        return DEFAULT_SIZE
    }

    private inner class ScrollViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView)

    private inner class HeaderViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView)

    companion object {

        private const val TYPE_NORMAL = 1000
        private const val TYPE_HEADER = 2000

        private const val DEFAULT_SIZE = 31
    }
}