res/layout/action_bar_with_button.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~ Copyright (C) 2017 The Android Open Source Project
  ~
  ~ 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
  ~
  ~      http://www.apache.org/licenses/LICENSE-2.0
  ~
  ~ Unless required by applicable law or agreed to in writing, software
  ~ distributed under the License is distributed on an "AS IS" BASIS,
  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  ~ See the License for the specific language governing permissions and
  ~ limitations under the License
  -->

<RelativeLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="end|center_vertical"
        android:minHeight="@dimen/lens_header_height">

    <TextView
        android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        style="@style/CarTitle"
        android:gravity="center_vertical"
        android:layout_alignParentStart="true"
        android:maxLines="1"/>

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        android:orientation="horizontal">
        <Button
            android:id="@+id/action_button2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:background="@null"
            android:textSize="@dimen/medium_text_size"
            android:visibility="gone"
            android:layout_marginEnd="@dimen/button_margin" />

        <Button
            android:id="@+id/action_button1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:background="@null"
            android:textSize="@dimen/medium_text_size"
            android:layout_marginEnd="@dimen/stream_content_keyline_1"/>
    </LinearLayout>
</RelativeLayout>