SampleAdapter.kt

/**
 * Represent ViewTypes which user provides
 */
sealed class ViewType {
    object ListItemHeader : ViewType()
    object ListItemContent : ViewType()
}

/**
 * Test View Holders
 */
class ContentHeader(view: View) : ViewHolder(view) {
    fun bind(){...}
}

class ContentContent(view: View) : ViewHolder(view) {
    fun bind(){...}
}


/**
 * Implementation of Adapter Class
 */
class SampleAdapter : Adapter() {
    
    /**
     * Similar to getItemViewType() of Recycler Adapter
     */
    override fun getViewType(pos: Int): ViewType {
        return when (pos) {
            0 -> ViewType.ListItemHeader
            else -> ViewType.ListItemContent
        }
    }
    
    /**
     * Similar to onBindViewHolder() of Recycler Adapter
     */
    override fun bindViewHolder(holder: ViewHolder, pos:Int) {
        when (holder) {
            is ContentHeader -> holder.bind()
            is ContentContent -> holder.bind()
        }
    }
   
    /**
     * Similar to onCreateViewHolder() of Recycler Adapter
     */
    override fun createViewHolder(viewType: ViewType): ViewHolder {
        when (viewType) {
            ViewType.ListItemContent -> TODO()
            ViewType.ListItemHeader -> TODO()
        }
    }
}