nextcloud-talk-android/app/src/main/res/layout/item_system_message.xml

<?xml version="1.0" encoding="utf-8"?><!--
  ~ Nextcloud Talk application
  ~
  ~ @author Mario Danic
  ~ Copyright (C) 2017-2018 Mario Danic <mario@lovelyhq.com>
  ~
  ~ This program is free software: you can redistribute it and/or modify
  ~ it under the terms of the GNU General Public License as published by
  ~ the Free Software Foundation, either version 3 of the License, or
  ~ at your option) any later version.
  ~
  ~ This program is distributed in the hope that it will be useful,
  ~ but WITHOUT ANY WARRANTY; without even the implied warranty of
  ~ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  ~ GNU General Public License for more details.
  ~
  ~ You should have received a copy of the GNU General Public License
  ~ along with this program.  If not, see <http://www.gnu.org/licenses/>.
  -->

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_marginStart="16dp"
    android:layout_marginTop="8dp"
    android:layout_marginEnd="16dp"
    android:layout_marginBottom="8dp">

    <com.google.android.flexbox.FlexboxLayout
        android:id="@id/bubble"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:layout_centerHorizontal="true"
        app:alignContent="stretch"
        app:alignItems="stretch"
        app:flexWrap="wrap"
        app:justifyContent="flex_end">

        <androidx.emoji.widget.EmojiTextView
            android:id="@+id/messageText"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:gravity="center_horizontal"
            android:textAlignment="center"
            tools:text="System message"
            android:textColor="@color/colorPrimary"
            android:textSize="14sp"
            app:layout_alignSelf="flex_start"
            app:layout_flexGrow="1"
            app:layout_wrapBefore="true"/>

        <TextView
            android:id="@id/messageTime"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="@color/warm_grey_four"
            android:textSize="12sp"
            tools:text="17:30"
            android:layout_marginStart="8dp"
            app:layout_alignSelf="center"
            app:layout_flexGrow="1"
            app:layout_wrapBefore="false"/>
    </com.google.android.flexbox.FlexboxLayout>
</RelativeLayout>