Android ActionBar MenuItem LowerCase

Solution for native ActionBar implementation:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <style name="MyTheme" parent="android:Theme.Holo">
        <item name="android:actionMenuTextAppearance">@style/MyMenuTextAppearance</item>
    </style>
    <style name="MyMenuTextAppearance" parent="android:TextAppearance.Holo.Widget.ActionBar.Menu">
        <item name="android:textAllCaps">false</item>
    </style>
</resources>

If you are using ActionBarSherlock there are two different approaches:

1) Create boolean resource abs__config_actionMenuItemAllCaps and set it to false:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <bool name="abs__config_actionMenuItemAllCaps">false</bool>
</resources>

2) Or create theme with overriden actionMenuTextAppearance and use it in AndroidManifest.xml:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <style name="MyTheme" parent="Theme.Sherlock">
        <item name="actionMenuTextAppearance">@style/MyMenuTextAppearance</item>
        <item name="android:actionMenuTextAppearance">@style/MyMenuTextAppearance</item>
    </style>
    <style name="MyMenuTextAppearance" parent="TextAppearance.Sherlock.Widget.ActionBar.Menu">
        <item name="android:textAllCaps">false</item>
    </style>
</resources>

PLEASE NOTE: there is bug in ActionBarSherlock that forces MenuItem to be upper case on pre-ICS (https://github.com/JakeWharton/ActionBarSherlock/issues/969). I’ve submitted patch but it is not merged at the moment. For now you can use my fork: https://github.com/alexander-mironov/ActionBarSherlock/tree/dev, I will update this answer when my code is merged in the main repository.

UPDATE: my fix has been merged into main ActionBarSherlock repository.