android-calculatorpp/android-app/src/main/res/values/theme_material.xml

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<resources>

	<style name="CppKeyboardButton.Material.Digit" parent="CppKeyboardButton">
		<item name="android:background">@drawable/material_button_dark</item>
		<item name="android:stateListAnimator">@null</item>
	</style>

	<style name="CppKeyboardButton.Material.Operation" parent="CppKeyboardButton.Material.Digit">
		<item name="android:background">@drawable/material_blue_button</item>
	</style>

	<style name="CppKeyboardButton.Material.Control.Image" parent="CppKeyboardButton.Material.Digit">
		<item name="android:padding">6dp</item>
	</style>

	<style name="Cpp.Theme.Material" parent="Cpp.Theme">
		<item name="cpp_button_style_digit">@style/CppKeyboardButton.Material.Digit</item>
		<item name="cpp_button_style_control">@style/CppKeyboardButton.Material.Digit</item>
		<item name="cpp_button_style_control_image">@style/CppKeyboardButton.Material.Control.Image</item>
		<item name="cpp_button_style_operation">@style/CppKeyboardButton.Material.Operation</item>
	</style>

	<style name="Cpp.Theme.Dialog.Material" parent="Cpp.Theme.Dialog">
		<item name="cpp_button_style_digit">@style/CppKeyboardButton.Material.Digit</item>
		<item name="cpp_button_style_control">@style/CppKeyboardButton.Material.Digit</item>
		<item name="cpp_button_style_control_image">@style/CppKeyboardButton.Material.Control.Image</item>
		<item name="cpp_button_style_operation">@style/CppKeyboardButton.Material.Operation</item>
	</style>

</resources>