Remove CustomDividerItemDecoration class inside ChatRoomsFragment file.

app/src/main/java/chat/rocket/android/chatrooms/ui/ChatRoomsFragment.kt

 package chat.rocket.android.chatrooms.ui
 
-import android.content.Context
-import android.graphics.Canvas
-import android.graphics.drawable.Drawable
 import android.os.Bundle
 import android.support.v4.app.Fragment
 import android.support.v7.widget.LinearLayoutManager
-import android.support.v7.widget.RecyclerView
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
@@ -14,6 +10,7 @@ import android.widget.Toast
 import chat.rocket.android.R
 import chat.rocket.android.chatrooms.presentation.ChatRoomsPresenter
 import chat.rocket.android.chatrooms.presentation.ChatRoomsView
+import chat.rocket.android.widget.DividerItemDecoration
 import chat.rocket.core.model.ChatRoom
 import dagger.android.support.AndroidSupportInjection
 import kotlinx.android.synthetic.main.fragment_chat_rooms.*
@@ -41,7 +38,7 @@ class ChatRoomsFragment : Fragment(), ChatRoomsView {
     override fun showChatRooms(dataSet: MutableList<ChatRoom>) {
         activity?.apply {
             recycler_view.layoutManager = LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false)
-            recycler_view.addItemDecoration(CustomDividerItemDecoration(this, 144, 32))
+            recycler_view.addItemDecoration(DividerItemDecoration(this, 144, 32))
             recycler_view.adapter = ChatRoomsAdapter(dataSet, this)
         }
     }
@@ -52,32 +49,3 @@ class ChatRoomsFragment : Fragment(), ChatRoomsView {
 
     override fun showMessage(message: String) = Toast.makeText(activity, message, Toast.LENGTH_SHORT).show()
 }
\ No newline at end of file
-
-class CustomDividerItemDecoration(context: Context, private var boundStart: Int = 0, private var boundRight: Int = 0) : RecyclerView.ItemDecoration() {
-    private val attrs = intArrayOf(android.R.attr.listDivider)
-    private var divider: Drawable
-
-    init {
-        val styledAttributes = context.obtainStyledAttributes(attrs)
-        divider = styledAttributes.getDrawable(0)
-        styledAttributes.recycle()
-    }
-
-    override fun onDraw(c: Canvas, parent: RecyclerView, state: RecyclerView.State) {
-        val left = parent.paddingLeft + boundStart
-        val right = (parent.width - parent.paddingRight) - boundRight
-
-        val childCount = parent.childCount
-        for (i in 0 until childCount) {
-            val child = parent.getChildAt(i)
-
-            val params = child.layoutParams as RecyclerView.LayoutParams
-
-            val top = child.bottom + params.bottomMargin
-            val bottom = top + divider.intrinsicHeight
-
-            divider.setBounds(left, top, right, bottom)
-            divider.draw(c)
-        }
-    }
-}
\ No newline at end of file