android-calculatorpp/calculatorpp/res/values/styles-default-theme.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~ Copyright (c) 2009-2011. Created by serso aka se.solovyev.
  ~ For more information, please, contact se.solovyev@gmail.com
  ~ or visit http://se.solovyev.org
  -->

<resources>
	<style name="default_digit_button_style" parent="button_style">
		<item name="android:background">@drawable/default_button</item>
	</style>

	<style name="default_control_button_style" parent="button_style"/>

	<style name="default_operation_button_style" parent="default_digit_button_style">
		<item name="android:textColor">@color/button_operator_text_color</item>
	</style>

	<style name="default_control_image_button_style" parent="default_control_button_style">
		<item name="android:padding">6dp</item>
	</style>

	<style name="default_theme">
		<item name="digitButtonStyle">@style/default_digit_button_style</item>
		<item name="controlButtonStyle">@style/default_control_button_style</item>
		<item name="controlImageButtonStyle">@style/default_control_image_button_style</item>
		<item name="operationButtonStyle">@style/default_operation_button_style</item>
	</style>
</resources>