Setup app bar in XML Layout.

app_bar_sample.xml

<android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppTheme.AppBarOverlay">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="@android:color/background_light"
            app:popupTheme="@style/AppTheme.PopupOverlay"
            app:title="TED Talks"
            app:titleTextColor="@color/colorPrimary" />
</android.support.design.widget.AppBarLayout>