session-android/res/layout/conversation_item_last_seen.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:paddingTop="24dp"
    android:paddingBottom="20dp">

    <View
        android:layout_width="match_parent"
        android:layout_height="4dp"
        android:layout_marginStart="28dp"
        android:layout_marginEnd="28dp"
        android:layout_marginBottom="3dp"
        android:background="?attr/conversation_item_last_seen_line_color" />

    <TextView
        android:id="@+id/text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        style="@style/Signal.Text.Caption"
        android:textAllCaps="true"
        android:fontFamily="sans-serif-medium"
        android:textColor="?attr/conversation_item_last_seen_text_color"
        tools:text="3 unread messages" />

</LinearLayout>