tachiyomi/app/src/main/res/layout/activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center">

    <include
        android:id="@+id/toolbar"
        layout="@layout/toolbar" />

    <!-- the layout which will contain (host) the drawerLayout -->
    <FrameLayout
        android:id="@+id/drawer_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@id/toolbar">

        <!-- the layout which will be the content of the activity (which will be hosted inside the drawer (NOT the list of the drawer)) -->
        <FrameLayout
            android:id="@+id/frame_container"
            android:layout_width="match_parent"
            android:layout_height="match_parent">

        </FrameLayout>
    </FrameLayout>
</RelativeLayout>