open-keychain/OpenKeychain/src/main/res/layout/toolbar_standalone.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/toolbar_include"
    android:elevation="4dp"
    android:background="?attr/colorPrimary"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

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

</RelativeLayout>