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">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:paddingLeft="16dp"
        android:paddingRight="16dp">

        <view
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            class="se.emilsjolander.stickylistheaders.StickyListHeadersListView"
            android:id="@+id/list" />
    </LinearLayout>

</ScrollView>