conversations-classic/res/layout/contact_key.xml

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

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_toLeftOf="@+id/button_remove"
        android:orientation="vertical"
        android:padding="8dp" >

        <TextView
            android:id="@+id/key"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="@color/primarytext"
            android:textSize="?attr/TextSizeHeadline"
            android:typeface="monospace" />

        <TextView
            android:id="@+id/key_type"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="@color/secondarytext" />
    </LinearLayout>

    <ImageButton
        android:id="@+id/button_remove"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_centerVertical="true"
        android:padding="8dp"
        android:background="?android:selectableItemBackground"
        android:src="@drawable/ic_action_remove"
        android:visibility="invisible"/>

</RelativeLayout>