activity_integer_list.xml

<?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:orientation="vertical">

  <android.support.v7.widget.RecyclerView
      android:id="@+id/recycler"
      android:layout_width="match_parent"
      android:layout_height="0dp"
      android:layout_weight="1">

  </android.support.v7.widget.RecyclerView>

  <LinearLayout android:layout_width="match_parent"
      android:layout_height="72dp"
      android:background="#2a2a2a"
      android:gravity="center"
      android:orientation="horizontal">

    <Button android:id="@+id/addButton" android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Add"/>

    <Button android:id="@+id/removeButton" android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Remove"/>
  </LinearLayout>
</LinearLayout>