android-calculatorpp/res/values/styles.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

	<style name="editTextInputStyle">
		<item name="android:layout_width">fill_parent</item>
		<item name="android:layout_height">wrap_content</item>
		<item name="android:typeface">monospace</item>
	</style>

	<style name="button_style">
		<item name="android:layout_width">match_parent</item>
		<item name="android:layout_height">match_parent</item>
		<item name="android:layout_weight">1</item>
		<item name="android:focusable">true</item>
		<item name="android:textSize">20dp</item>
		<item name="android:background">@drawable/button</item>
		<item name="android:layout_marginLeft">1dp</item>
		<item name="android:layout_marginBottom">1dp</item>
	</style>

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

	<style name="violet_digit_button_style" parent="button_style">
		<item name="android:background">@drawable/violet_button</item>
	</style>

	<style name="light_blue_digit_button_style" parent="button_style">
		<item name="android:background">@drawable/light_blue_button</item>
	</style>

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

	<style name="violet_control_button_style" parent="button_style">
		<item name="android:background">@drawable/dark_violet_button</item>
	</style>

	<style name="light_blue_control_button_style" parent="button_style">
		<item name="android:background">@drawable/dark_blue_button</item>
	</style>

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

	<style name="violet_control_image_button_style" parent="violet_control_button_style">
		<item name="android:padding">6dp</item>
	</style>

	<style name="light_blue_control_image_button_style" parent="light_blue_control_button_style">
		<item name="android:padding">6dp</item>
	</style>

	<style name="editor_style">
		<item name="android:textSize">25dp</item>
		<item name="android:background">#000000</item>
		<item name="android:textColor">@color/text_color</item>
		<item name="android:gravity">left|top</item>
		<item name="android:padding">5dp</item>
		<item name="android:layout_width">match_parent</item>
		<item name="android:layout_height">match_parent</item>
	</style>

	<style name="display_style">
		<item name="android:textSize">25dp</item>
		<item name="android:background">#000000</item>
		<item name="android:textColor">@color/text_color</item>
		<item name="android:gravity">right|center_vertical</item>
		<item name="android:padding">5dp</item>
		<item name="android:layout_width">match_parent</item>
		<item name="android:layout_height">match_parent</item>
	</style>

	<style name="about_style">
		<item name="android:textSize">15dp</item>
		<item name="android:background">#000000</item>
		<item name="android:textColor">@color/text_color</item>
		<item name="android:gravity">center</item>
		<item name="android:padding">5dp</item>
		<item name="android:layout_width">match_parent</item>
		<item name="android:layout_height">match_parent</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>
	</style>

	<style name="violet_theme">
		<item name="digitButtonStyle">@style/violet_digit_button_style</item>
		<item name="controlButtonStyle">@style/violet_control_button_style</item>
		<item name="controlImageButtonStyle">@style/violet_control_image_button_style</item>
	</style>

	<style name="light_blue_theme">
		<item name="digitButtonStyle">@style/light_blue_digit_button_style</item>
		<item name="controlButtonStyle">@style/light_blue_control_button_style</item>
		<item name="controlImageButtonStyle">@style/light_blue_control_image_button_style</item>
	</style>

</resources>