activity_main.xml

<android.support.design.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/coordinator"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <android.support.design.widget.AppBarLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

        </android.support.design.widget.AppBarLayout>
        <android.support.v7.widget.RecyclerView
            android:id="@+id/recyclerview_main"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:paddingBottom="50dp">

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

        <include layout="@layout/persistent_bottomsheet"/>

</android.support.design.widget.CoordinatorLayout>