session-android/res/layout/conversation_list_activity.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                xmlns:tools="http://schemas.android.com/tools"
                android:id="@id/container"
                android:orientation="vertical"
                android:layout_width="match_parent"
                android:layout_height="match_parent">

    <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_alignParentTop="true"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:minHeight="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            android:theme="?attr/actionBarStyle">

        <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent">

            <ImageView android:layout_width="36dp"
                       android:layout_height="36dp"
                       android:layout_marginLeft="8dp"
                       android:layout_marginStart="8dp"
                       android:src="@drawable/icon_transparent"
                       android:layout_alignParentLeft="true"
                       android:layout_alignParentStart="true"
                       android:layout_centerVertical="true"/>

            <TextView android:layout_width="wrap_content"
                      android:layout_height="wrap_content"
                      android:text="@string/app_name"
                      android:textColor="@color/white"
                      android:textSize="25sp"
                      android:layout_alignParentStart="true"
                      android:layout_alignParentLeft="true"
                      android:layout_centerVertical="true"
                      android:layout_toLeftOf="@+id/search_action"
                      android:layout_toStartOf="@+id/search_action"
                      android:layout_marginStart="66dp"
                      android:layout_marginLeft="66dp"/>

            <ImageView android:id="@+id/search_action"
                       android:layout_width="wrap_content"
                       android:layout_height="wrap_content"
                       android:src="@drawable/ic_search_white_24dp"
                       android:paddingRight="16dp"
                       android:paddingEnd="16dp"
                       android:layout_alignParentRight="true"
                       android:layout_alignParentEnd="true"
                       android:layout_centerVertical="true"/>

        </RelativeLayout>

    </android.support.v7.widget.Toolbar>

    <FrameLayout android:id="@+id/fragment_container"
                 android:layout_below="@id/toolbar"
                 android:layout_width="match_parent"
                 android:layout_height="match_parent"/>

    <org.thoughtcrime.securesms.components.SearchToolbar
            android:id="@+id/search_toolbar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            android:visibility="invisible"
            tools:visibility="visible"/>

</RelativeLayout>