Signal-Android/app/src/main/res/layout/conversation_item_update.xml

<?xml version="1.0" encoding="utf-8"?>
<org.thoughtcrime.securesms.conversation.ConversationUpdateItem
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/conversation_update_item"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@drawable/conversation_item_background"
    android:focusable="true"
    android:gravity="center"
    android:orientation="vertical"
    android:paddingBottom="6dp"
    android:paddingStart="28dp"
    android:paddingEnd="28dp"
    android:paddingTop="8dp">

    <org.thoughtcrime.securesms.components.emoji.EmojiTextView
        android:id="@+id/conversation_update_body"
        style="@style/Signal.Text.Preview"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:textColor="?attr/conversation_item_update_text_color"
        tools:text="Gwen Stacy set the disappearing message timer to 1 hour" />

</org.thoughtcrime.securesms.conversation.ConversationUpdateItem>