Update theme documentation a bit.

      <ol>

        <li><a href="#ApplyAStyle">Apply a style to a View</a></li>

        <li><a href="#ApplyATheme">Apply a theme to an Activity or application</a></li>

        <li><a href="#SelectATheme">Select a theme based on platform version</a></li>

      </ol>

    </li>

    <li><a href="#PlatformStyles">Using Platform Styles and Themes</a></li>

</pre>

<p>If you like a theme, but want to tweak it, just add the theme as the <code>parent</code>

of your custom theme. For example, you can modify the traditional dialog theme to use your own

background image like this:</p>

of your custom theme. For example, you can modify the traditional light theme to use your own

color like this:</p>

<pre>

<style name="CustomDialogTheme" parent="@android:style/Theme.Dialog">

    <item name="android:windowBackground">@drawable/custom_dialog_background</item>

<color name="custom_theme_color">#b0b0ff</color>

<style name="CustomTheme" parent="android:Theme.Light">

    <item name="android:windowBackground">@color/custom_theme_color</item>

    <item name="android:colorBackground">@color/custom_theme_color</item>

</style>

</pre>

<p>Now use {@code CustomDialogTheme} instead of {@code Theme.Dialog} inside the Android

<p>(Note that the color needs to supplied as a separate resource here because

the <code>android:windowBackground</code> attribute only supports a reference to

another resource; unlike <code>android:colorBackground</code>, it can not be given

a color literal.)</p>

<p>Now use {@code CustomTheme} instead of {@code Theme.Light} inside the Android

Manifest:</p>

<pre>

<activity android:theme="@style/CustomDialogTheme">

<activity android:theme="@style/CustomTheme">

</pre>

<h3 id="SelectATheme">Select a theme based on platform version</h3>

<p>Newer versions of Android have additional themes available to applications,

and you may want to use these while running on those platforms while still being

compatible with older versions.  You can accomplish this through a custom theme

that uses resource selection to switch between different parent themes.</p>

<p>For example, here is the declaration for a custom theme which is simply

the standard platforms default light theme.  It would go in an XML file under

<code>res/values</code> (typically <code>res/values/styles.xml</code>):

<pre>

<style name="LightThemeSelector" parent="android:Theme.Light">

</style>

</pre>

<p>To have this theme use the newer "holo" theme when the application is running

on {@link android.os.Build.VERSION_CODES#HONEYCOMB}, you can place another

declaration for it in a file in <code>res/values-11</code>:</p>

<pre>

<style name="LightThemeSelector" parent="android:Theme.Holo.Light">

</style>

</pre>

<p>Now use this theme like you would any other, and your application will

automatically switch to the holo theme if running on

{@link android.os.Build.VERSION_CODES#HONEYCOMB} or later.</p>

<p>A list of the standard attributes that you can use in themes can be

found at {@link android.R.styleable#Theme R.styleable.Theme}.</p>

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