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:background">@drawable/button</item>
        <item name="android:layout_marginLeft">1dp</item>
    </style>

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

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

    <style name="button_small_style" parent="button_style">
        <item name="android:textSize">30dp</item>
    </style>

    <style name="display_style">
        <item name="android:textSize">25dp</item>
        <item name="android:background">#000000</item>
        <item name="android:textColor">#ffffff</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>

</resources>