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

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".ui.EditIdentitiesActivity">

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:paddingBottom="96dp"
            android:paddingLeft="16dp"
            android:paddingRight="16dp"
            android:paddingTop="16dp">

            <CheckBox
                android:id="@+id/edit_identities_upload_checkbox"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:checked="true"
                android:text="@string/label_send_key"
                android:paddingTop="16dp"
                android:paddingBottom="16dp"/>

            <android.support.v7.widget.CardView
                android:id="@+id/edit_identities_user_ids_card"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_gravity="center"
                card_view:cardBackgroundColor="?attr/colorCardViewBackground"
                card_view:cardCornerRadius="4dp"
                card_view:cardElevation="2dp"
                card_view:cardUseCompatPadding="true">

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

                    <TextView
                        style="@style/CardViewHeader"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text="@string/section_user_ids" />

                    <org.sufficientlysecure.keychain.ui.widget.FixedListView
                        android:id="@+id/edit_identities_user_ids"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content" />

                    <View
                        android:layout_width="match_parent"
                        android:layout_height="1dip"
                        android:background="?android:attr/listDivider" />

                    <org.sufficientlysecure.keychain.ui.widget.FixedListView
                        android:id="@+id/edit_identities_user_ids_added"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content" />

                </LinearLayout>

            </android.support.v7.widget.CardView>

        </LinearLayout>

    </ScrollView>

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/edit_identities_add_user_id"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:layout_marginBottom="24dp"
        android:layout_marginRight="24dp"
        android:src="@drawable/ic_add_white_24dp" />

</RelativeLayout>