<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/gray_bg"
    android:orientation="vertical">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/simple_recyclerview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="center_horizontal" />

</LinearLayout>