azizkayumov

override fun onCreateViewHolder(parent: ViewGroup, itemViewType: Int): MessageViewHolder {
        val messageParent = LinearLayout(parent.context)
        messageParent.orientation = LinearLayout.VERTICAL
        messageParent.setPadding(0,0,0,80)

        if (itemViewType and 1 >= 1){
            // here, you should add ImageView
            // for the sake of easiness, let me add simple textview
            val tvPhoto = TextView(parent.context)
            tvPhoto.layoutParams = LinearLayout.LayoutParams(WRAP_CONTENT,WRAP_CONTENT)

azizkayumov

    override fun getItemViewType(position: Int): Int {
        val message = list[position]
        var flags = 0

        if (message.attachment.isPhoto())
            flags = flags or 1

        if (message.attachment.isMusic())
            flags = flags or 2

azizkayumov

data class Message(val id: Long = 0L,
                   val fromId: Long = 0L,
                   val text: String = "",
                   val attachment: Attachment = Attachment())

data class Attachment(val type: Int = 0) {
    companion object {
        val TYPE_PHOTO = 1
        val TYPE_MUSIC = 2
        val TYPE_CONTACT = 3

azizkayumov

class MessageUI(val flags: Int){
    fun createMessageUI(context: Context):View{
        val verticalLayout = LinearLayout(context)
        verticalLayout.layoutParams = ViewGroup.LayoutParams(matchParent, wrapContent)
        verticalLayout.orientation = LinearLayout.VERTICAL

        if (flags and 1 >= 0){
            // add reply preview
            val tvReply = TextView(context)
            tvReply.text = "Reply"

azizkayumov

class Message(var id: Long = 0L,
              var fromId: Long = 0L, // message owner -> Account.id
              var date: Long = 0L, // sent date
              var text: String = "", // message content
              var replyId: Long = 0L, // id of replied message
              var replyMessage: Message? = null, // replied message
              var attachment: Attachment? = null
){
    companion object {
        // statuses

azizkayumov

override fun getItemViewType(position: Int): Int {
        val message = list[position]
        when(message.type){
            TEXT -> return 0
            IMAGE -> return 1
            VIDEO -> return 2
            /// and many more
        }
        return super.getItemViewType(position)
}

azizkayumov

class MessageAdapter() : RecyclerView.Adapter<MessageAdapter.MessageViewHolder>() {

    private var list: MultiSortedList<Message>

    init {
        val updateCallback = object : MultiSortedList.UpdateCallback<Message> {
            override fun sortBy(i1: Message, i2: Message): Int {
                return i2.date.compareTo(i1.date)
            }

azizkayumov

data class Message(var id: Long, var date: Long, var text: String)

azizkayumov

import android.support.v7.widget.RecyclerView

/**
 * Created by abduaziz on 6/14/18.
 *
 *   MultiSortedList is a wrapper component to ArrayList that keeps its elements in a sorted order
 *   using UpdateCallbackInterface. It is intended to be used inside recycler view adapters.
 *
 * */

azizkayumov

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent" android:layout_height="match_parent">
    <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="1" />
    <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="2" />
    <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="3" />
    <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="4" />
    <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="5" />
    <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="6" />
    <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="7" />