Develop their own Android calculator app for reference- not for commercial use

Calculator
..........\.classpath
..........\.project
..........\.settings
..........\AndroidManifest.xml
..........\assets
..........\bin
..........\...\classes
..........\...\.......\com
..........\...\.......\...\android
..........\...\.......\...\.......\calculator
..........\...\.......\...\.......\..........\Calculator.class
..........\...\.......\...\.......\..........\CalculatorDisplay$1.class
..........\...\.......\...\.......\..........\CalculatorDisplay$Scroll.class
..........\...\.......\...\.......\..........\CalculatorDisplay.class
..........\...\.......\...\.......\..........\CalculatorEditable$Factory.class
..........\...\.......\...\.......\..........\CalculatorEditable.class
..........\...\.......\...\.......\..........\ColorButton.class
..........\...\.......\...\.......\..........\EventListener.class
..........\...\.......\...\.......\..........\History.class
..........\...\.......\...\.......\..........\HistoryAdapter.class
..........\...\.......\...\.......\..........\HistoryEntry.class
..........\...\.......\...\.......\..........\Logic.class
..........\...\.......\...\.......\..........\PanelSwitcher$1.class
..........\...\.......\...\.......\..........\PanelSwitcher.class
..........\...\.......\...\.......\..........\Persist.class
..........\...\.......\...\.......\..........\R$attr.class
..........\...\.......\...\.......\..........\R$color.class
..........\...\.......\...\.......\..........\R$drawable.class
..........\...\.......\...\.......\..........\R$id.class
..........\...\.......\...\.......\..........\R$layout.class
..........\...\.......\...\.......\..........\R$string.class
..........\...\.......\...\.......\..........\R$style.class
..........\...\.......\...\.......\..........\R.class
..........\...\res
..........\gen
..........\...\com
..........\...\...\android
..........\...\...\.......\calculator
..........\...\...\.......\..........\R.java
..........\libs
..........\....\arity-2.1.2.jar
..........\proguard.cfg
..........\project.properties
..........\res
..........\...\drawable
..........\...\drawable-hdpi
..........\...\.............\advanced.png
..........\...\.............\clear_history.png
..........\...\.............\icon.png
..........\...\.............\simple.png
..........\...\drawable-mdpi
..........\...\.............\advanced.png
..........\...\.............\clear_history.png
..........\...\.............\icon.png
..........\...\.............\simple.png
..........\...\........\blue_button.xml
..........\...\........\button.xml
..........\...\layout-land
..........\...\...........\history_item.xml
..........\...\...........\main.xml
..........\...\layout-port
..........\...\...........\history_item.xml
..........\...\...........\main.xml
..........\...\values
..........\...\values-ar
..........\...\.........\strings.xml
..........\...\values-bg
..........\...\.........\strings.xml
..........\...\values-ca
..........\...\.........\strings.xml
..........\...\values-cs
..........\...\.........\strings.xml
..........\...\values-da
..........\...\.........\strings.xml
..........\...\values-de
..........\...\.........\strings.xml
..........\...\values-el
..........\...\.........\strings.xml
..........\...\values-en-rGB
..........\...\.............\strings.xml
..........\...\values-es
..........\...\values-es-rUS
..........\...\.............\strings.xml
..........\...\.........\strings.xml
..........\...\values-fa
..........\...\.........\strings.xml
..........\...\values-fi
..........\...\.........\strings.xml
..........\...\values-fr
..........\...\.........\strings.xml
..........\...\values-hr
..........\...\.........\strings.xml
..........\...\values-hu
..........\...\.........\strings.xml
..........\...\values-in
..........\...\.........\strings.xml
..........\...\values-it
..........\...\.........\strings.xml
..........\...\values-iw

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