res/layout/action_bar_progress_spinner_layout.xml

<?xml version="1.0" encoding="UTF-8"?>
<!--
     Copyright (C) 2011 Google Inc.
     Licensed to 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.
-->

<!-- ProgressBar must be wrapped into a container view if we want to control its
    visibility programmatically. The visibility of the container is determined by the
    visibility set on the MenuItem, not by the explicit setVisibility() calls. -->
<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:paddingRight="16dp">
    <ProgressBar
        android:id="@+id/action_bar_progress_spinner_view"
        style="?android:attr/progressBarStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="5dip"
        android:indeterminate="true" />
</FrameLayout>