To do a relatively good android simple calculator, suitable for beginners

calculator\.classpath
..........\.project
..........\AndroidManifest.xml
..........\bin\calculator.apk
..........\...\.lasses\com\itjob\android\BuildConfig.class
..........\...\.......\...\.....\.......\MainActivity$1.class
..........\...\.......\...\.....\.......\MainActivity$2.class
..........\...\.......\...\.....\.......\MainActivity$numButtonOnClick.class
..........\...\.......\...\.....\.......\MainActivity$openButtonOnClick.class
..........\...\.......\...\.....\.......\MainActivity.class
..........\...\.......\...\.....\.......\R$attr.class
..........\...\.......\...\.....\.......\R$drawable.class
..........\...\.......\...\.....\.......\R$id.class
..........\...\.......\...\.....\.......\R$layout.class
..........\...\.......\...\.....\.......\R$string.class
..........\...\.......\...\.....\.......\R.class
..........\...\classes.dex
..........\...\jarlist.cache
..........\...\res\drawable\calc.png
..........\...\...\........-hdpi\ic_launcher.png
..........\...\...\.........ldpi\ic_launcher.png
..........\...\...\.........mdpi\ic_launcher.png
..........\...\...\.........xhdpi\ic_launcher.png
..........\...\resources.ap_
..........\gen\com\itjob\android\BuildConfig.java
..........\...\...\.....\.......\R.java
..........\proguard-project.txt
..........\project.properties
..........\res\drawable\calc.png
..........\...\........-hdpi\ic_launcher.png
..........\...\.........ldpi\ic_launcher.png
..........\...\.........mdpi\ic_launcher.png
..........\...\.........xhdpi\ic_launcher.png
..........\...\layout\main.xml
..........\...\values\strings.xml
..........\src\com\itjob\android\MainActivity.java
..........\bin\classes\com\itjob\android
..........\...\.......\...\itjob
..........\gen\com\itjob\android
..........\src\com\itjob\android
..........\bin\classes\com
..........\...\res\drawable
..........\...\...\drawable-hdpi
..........\...\...\drawable-ldpi
..........\...\...\drawable-mdpi
..........\...\...\drawable-xhdpi
..........\gen\com\itjob
..........\src\com\itjob
..........\bin\classes
..........\...\res
..........\gen\com
..........\res\drawable
..........\...\drawable-hdpi
..........\...\drawable-ldpi
..........\...\drawable-mdpi
..........\...\drawable-xhdpi
..........\...\layout
..........\...\values
..........\src\com
..........\assets
..........\bin
..........\gen
..........\res
..........\src
calculator

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