car_product/car_ui_portrait/apps/CarUiPortraitLauncher/res/layout/car_ui_portrait_toolbar.xml

<?xml version="1.0" encoding="utf-8" ?>
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  ~
  ~ Licensed under the Apache License, Version 2.0 (the "License");
  ~ you may not use this file except in compliance with the License.
  ~ You may obtain a copy of the License at
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  ~      http://www.apache.org/licenses/LICENSE-2.0
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<com.android.car.portraitlauncher.panel.ToolBarView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="@*android:dimen/status_bar_height"
    android:background="@color/car_under_surface"
    android:visibility="gone">

    <ImageView
        android:id="@+id/back_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/immersive_back"
        android:layout_alignParentStart="true"
        android:layout_centerVertical="true"
        android:layout_marginStart="@dimen/toolbar_back_button_start_margin"/>

    <TextClock
        android:id="@+id/clock"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:textAppearance="@style/TextAppearance.Car.Subhead.Large"
        android:textColor="@color/car_neutral_variant_100"/>

</com.android.car.portraitlauncher.panel.ToolBarView>