code optimisation for empty file view

app/src/main/java/chat/rocket/android/chatroom/ui/ChatRoomFragment.kt

@@ -265,7 +265,7 @@ class ChatRoomFragment : Fragment(), ChatRoomView, EmojiKeyboardListener, EmojiR
                 verticalScrollOffset.set(0)
             }
             presenter.loadActiveMembers(chatRoomId, chatRoomType, filterSelfOut = true)
-            toggleNoChatView(adapter.itemCount)
+            empty_chat_view.isVisible = adapter.itemCount == 0
         }
     }
 
@@ -287,18 +287,6 @@ class ChatRoomFragment : Fragment(), ChatRoomView, EmojiKeyboardListener, EmojiR
 
     }
 
-    private fun toggleNoChatView(size: Int) {
-        if (size == 0) {
-            image_chat_icon.setVisible(true)
-            text_chat_title.setVisible(true)
-            text_chat_description.setVisible(true)
-        } else {
-            image_chat_icon.setVisible(false)
-            text_chat_title.setVisible(false)
-            text_chat_description.setVisible(false)
-        }
-    }
-
     private val layoutChangeListener =
         View.OnLayoutChangeListener { _, _, _, _, bottom, _, _, _, oldBottom ->
             val y = oldBottom - bottom
@@ -412,7 +400,7 @@ class ChatRoomFragment : Fragment(), ChatRoomView, EmojiKeyboardListener, EmojiR
             adapter.prependData(message)
             recycler_view.scrollToPosition(0)
             verticalScrollOffset.set(0)
-            toggleNoChatView(adapter.itemCount)
+            empty_chat_view.isVisible = adapter.itemCount == 0
         }
     }
 

app/src/main/res/layout/fragment_chat_room.xml

@@ -30,13 +30,11 @@
         android:layout_height="100dp"
         android:src="@drawable/ic_chat_black_24dp"
         android:tint="@color/icon_grey"
-        android:visibility="gone"
         app:layout_constraintBottom_toTopOf="@id/text_chat_title"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent"
-        app:layout_constraintVertical_chainStyle="packed"
-        tools:visibility="visible" />
+        app:layout_constraintVertical_chainStyle="packed" />
 
     <TextView
         android:id="@+id/text_chat_title"
@@ -47,12 +45,10 @@
         android:textColor="@color/colorSecondaryText"
         android:textSize="20sp"
         android:textStyle="bold"
-        android:visibility="gone"
         app:layout_constraintBottom_toTopOf="@id/text_chat_description"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toBottomOf="@id/image_chat_icon"
-        tools:visibility="visible" />
+        app:layout_constraintTop_toBottomOf="@id/image_chat_icon" />
 
     <TextView
         android:id="@+id/text_chat_description"
@@ -63,11 +59,17 @@
         android:textAlignment="center"
         android:textColor="@color/colorSecondaryTextLight"
         android:textSize="16sp"
-        android:visibility="gone"
         app:layout_constraintBottom_toTopOf="@id/layout_message_composer"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toBottomOf="@id/text_chat_title"
+        app:layout_constraintTop_toBottomOf="@id/text_chat_title" />
+
+    <android.support.constraint.Group
+        android:id="@+id/empty_chat_view"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        app:constraint_referenced_ids="image_chat_icon, text_chat_title, text_chat_description"
+        android:visibility="gone"
         tools:visibility="visible" />
 
     <chat.rocket.android.widget.autocompletion.ui.SuggestionsView