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

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

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

    <FrameLayout
        android:id="@+id/content_frame"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <fragment
            android:id="@+id/multi_certify_key_fragment"
            android:name="org.sufficientlysecure.keychain.ui.CertifyKeyFragment"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />
    </FrameLayout>

</LinearLayout>