Add fragment_message.xml

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

+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical">
+
+    <android.support.v7.widget.RecyclerView
+        android:id="@+id/recycler_view"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:layout_above="@+id/layout_message_composer"
+        android:scrollbars="vertical" />
+
+    <include
+        android:id="@+id/layout_message_composer"
+        layout="@layout/message_composer"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_alignParentBottom="true" />
+
+</RelativeLayout>
\ No newline at end of file