open-keychain/OpenPGP-Keychain/src/main/res/layout/view_key_certs_fragment.xml

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:bootstrapbutton="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fillViewport="true">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <view
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            class="se.emilsjolander.stickylistheaders.StickyListHeadersListView"
            android:id="@+id/list"
            android:layout_alignParentTop="true"
            android:layout_above="@+id/showUnknown"
            android:paddingRight="32dp"
            android:layout_alignParentLeft="true"
            android:layout_alignParentStart="true"
            android:paddingLeft="16dp" />

        <CheckBox
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/show_unknown_signatures"
            android:id="@+id/showUnknown"
            android:enabled="true"
            android:layout_alignParentBottom="true"
            android:layout_alignEnd="@+id/list"
            android:singleLine="false"
            android:layout_alignParentRight="true"
            android:layout_marginRight="16dp" />

    </RelativeLayout>

</ScrollView>