http://li2.me/2016/08/make-a-reusable-ui-in-android-app-development.html

toolbar_actionbar.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.AppBarLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/topActionbarLayout"
    android:layout_height="wrap_content"
    android:layout_width="match_parent"
    android:elevation="@dimen/elevation_header">

    <android.support.v7.widget.Toolbar
        android:id="@+id/topActionbar"
        android:layout_width="match_parent"
        android:layout_height="@dimen/headerBarHeight"
        app:popupTheme="@style/ThemeOverlay.AppCompat.Light">

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

            <TextView
                android:id="@+id/topActionBack"
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:layout_alignParentLeft="true"
                android:layout_centerVertical="true"
                android:gravity="center"
                android:background="?selectableItemBackground"/>

            <TextView
                android:id="@+id/topActionTitle"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_centerInParent="true"
                android:gravity="center"
                android:text="title"/>

            <Button
                android:id="@+id/topActionClose"
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:layout_alignParentRight="true"
                android:layout_centerVertical="true"
                android:background="?selectableItemBackground"
                android:text="Close"/>
                
        </RelativeLayout>
    </android.support.v7.widget.Toolbar>
</android.support.design.widget.AppBarLayout>