show the appropriate messages at opening a thread

app/src/main/kotlin/com/simplemobiletools/smsmessenger/adapters/ThreadAdapter.kt

@@ -0,0 +1,73 @@
+package com.simplemobiletools.smsmessenger.adapters
+
+import android.view.Menu
+import android.view.View
+import android.view.ViewGroup
+import com.simplemobiletools.commons.adapters.MyRecyclerViewAdapter
+import com.simplemobiletools.commons.views.FastScroller
+import com.simplemobiletools.commons.views.MyRecyclerView
+import com.simplemobiletools.smsmessenger.R
+import com.simplemobiletools.smsmessenger.activities.SimpleActivity
+import com.simplemobiletools.smsmessenger.models.Message
+import kotlinx.android.synthetic.main.item_thread_message.view.*
+
+class ThreadAdapter(
+    activity: SimpleActivity, var messages: ArrayList<Message>,
+    recyclerView: MyRecyclerView,
+    fastScroller: FastScroller,
+    itemClick: (Any) -> Unit
+) : MyRecyclerViewAdapter(activity, recyclerView, fastScroller, itemClick) {
+
+    init {
+        setupDragListener(true)
+    }
+
+    override fun getActionMenuId() = R.menu.cab_messages
+
+    override fun prepareActionMode(menu: Menu) {}
+
+    override fun actionItemPressed(id: Int) {
+        if (selectedKeys.isEmpty()) {
+            return
+        }
+
+        when (id) {
+            R.id.cab_select_all -> selectAll()
+        }
+    }
+
+    override fun getSelectableItemCount() = messages.size
+
+    override fun getIsItemSelectable(position: Int) = true
+
+    override fun getItemSelectionKey(position: Int) = messages.getOrNull(position)?.id
+
+    override fun getItemKeyPosition(key: Int) = messages.indexOfFirst { it.id == key }
+
+    override fun onActionModeCreated() {}
+
+    override fun onActionModeDestroyed() {}
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int) = createViewHolder(R.layout.item_thread_message, parent)
+
+    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
+        val message = messages[position]
+        holder.bindView(message, true, true) { itemView, layoutPosition ->
+            setupView(itemView, message)
+        }
+        bindViewHolder(holder)
+    }
+
+    override fun getItemCount() = messages.size
+
+    private fun getItemWithKey(key: Int): Message? = messages.firstOrNull { it.id == key }
+
+    private fun getSelectedItems() = messages.filter { selectedKeys.contains(it.id) } as ArrayList<Message>
+
+    private fun setupView(view: View, message: Message) {
+        view.apply {
+            thread_message_body.text = message.body
+            thread_message_body.setTextColor(textColor)
+        }
+    }
+}