k-9/res/layout/actionbar_custom.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal" >

    <LinearLayout
        android:id="@+id/title_layout"
        android:layout_width="0dip"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:layout_gravity="center_vertical"
        android:orientation="vertical" >

        <TextView
            android:id="@+id/actionbar_title_first"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:ellipsize="start"
            android:singleLine="true"
            android:textAppearance="?android:attr/textAppearanceMedium" />

        <TextView
            android:id="@+id/actionbar_title_sub"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:ellipsize="end"
            android:singleLine="true"
            android:textAppearance="?android:attr/textAppearanceSmall"
            android:textColor="?android:attr/textColorSecondary" />
    </LinearLayout>

    <ProgressBar
        android:id="@+id/actionbar_progress"
        android:layout_width="32dp"
        android:layout_height="32dp"
        android:layout_gravity="center"
        style="?android:attr/indeterminateProgressStyle"
        android:visibility="gone" />

    <TextView
        android:id="@+id/actionbar_unread_count"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:paddingLeft="12dip"
        android:paddingRight="12dip"
        android:textColor="?android:attr/textColorTertiary"
        android:textSize="36sp" />

</LinearLayout>