According to learn to play the tutorial is their code, a complete calculator can perform simple math,

CalculatorDemo\.classpath
..............\.project
..............\.settings\org.eclipse.jdt.core.prefs
..............\AndroidManifest.xml
..............\bin\AndroidManifest.xml
..............\...\CalculatorDemo.apk
..............\...\classes\com\example\calculatordemo\BuildConfig.class
..............\...\.......\...\.......\..............\MainActivity.class
..............\...\.......\...\.......\..............\R$attr.class
..............\...\.......\...\.......\..............\R$color.class
..............\...\.......\...\.......\..............\R$dimen.class
..............\...\.......\...\.......\..............\R$drawable.class
..............\...\.......\...\.......\..............\R$id.class
..............\...\.......\...\.......\..............\R$layout.class
..............\...\.......\...\.......\..............\R$menu.class
..............\...\.......\...\.......\..............\R$string.class
..............\...\.......\...\.......\..............\R$style.class
..............\...\.......\...\.......\..............\R.class
..............\...\classes.dex
..............\...\dexedLibs\android-support-v4-a1e06f555f21ca4c2dea978508d4a11c.jar
..............\...\jarlist.cache
..............\...\res\crunch\drawable-hdpi\ic_launcher.png
..............\...\...\......\.........mdpi\ic_launcher.png
..............\...\...\......\.........xhdpi\ic_launcher.png
..............\...\...\......\..........xhdpi\ic_launcher.png
..............\...\resources.ap_
..............\gen\com\example\calculatordemo\BuildConfig.java
..............\...\...\.......\..............\R.java
..............\ic_launcher-web.png
..............\libs\android-support-v4.jar
..............\proguard-project.txt
..............\project.properties
..............\res\drawable\ashend_bg.xml
..............\...\........\grap_bg.xml
..............\...\........\orange_bg.xml
..............\...\........\orange_selector.xml
..............\...\........\white_bg.xml
..............\...\........\white_selector.xml
..............\...\........-hdpi\ic_launcher.png
..............\...\.........mdpi\ic_launcher.png
..............\...\.........xhdpi\ic_launcher.png
..............\...\..........xhdpi\ic_launcher.png
..............\...\layout\activity_main.xml
..............\...\......\fragment_main.xml
..............\...\menu\main.xml
..............\...\values\color.xml
..............\...\......\dimens.xml
..............\...\......\strings.xml
..............\...\......\styles.xml
..............\...\......-v11\styles.xml
..............\...\.........4\styles.xml
..............\...\.......w820dp\dimens.xml
..............\src\com\example\calculatordemo\MainActivity.java
..............\bin\classes\com\example\calculatordemo
..............\...\.......\...\example
..............\...\res\crunch\drawable-hdpi
..............\...\...\......\drawable-mdpi
..............\...\...\......\drawable-xhdpi
..............\...\...\......\drawable-xxhdpi
..............\gen\com\example\calculatordemo
..............\src\com\example\calculatordemo
..............\bin\classes\com
..............\...\res\crunch
..............\gen\com\example
..............\src\com\example
..............\bin\classes
..............\...\dexedLibs
..............\...\res
..............\gen\com
..............\res\drawable
..............\...\drawable-hdpi
..............\...\drawable-ldpi
..............\...\drawable-mdpi
..............\...\drawable-xhdpi
..............\...\drawable-xxhdpi
..............\...\layout
..............\...\menu
..............\...\values
..............\...\values-v11
..............\...\values-v14
..............\...\values-w820dp
..............\src\com
..............\.settings
..............\assets
..............\bin
..............\gen
..............\libs
..............\res
..............\src
CalculatorDemo

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