Based on an example of a simple factory model in the Android platform. The project is under AndroidStudio

Calculator
..........\.gitignore
..........\.gradle
..........\.......\2.8
..........\.......\...\taskArtifacts
..........\.......\...\.............\cache.properties
..........\.......\...\.............\cache.properties.lock
..........\.......\...\.............\fileHashes.bin
..........\.......\...\.............\fileSnapshots.bin
..........\.......\...\.............\outputFileStates.bin
..........\.......\...\.............\taskArtifacts.bin
..........\.idea
..........\.....\.name
..........\.....\compiler.xml
..........\.....\copyright
..........\.....\.........\profiles_settings.xml
..........\.....\encodings.xml
..........\.....\gradle.xml
..........\.....\libraries
..........\.....\.........\animated_vector_drawable_23_2_1.xml
..........\.....\.........\appcompat_v7_23_2_1.xml
..........\.....\.........\support_annotations_23_2_1.xml
..........\.....\.........\support_v4_23_2_1.xml
..........\.....\.........\support_vector_drawable_23_2_1.xml
..........\.....\misc.xml
..........\.....\modules.xml
..........\.....\runConfigurations.xml
..........\.....\vcs.xml
..........\.....\workspace.xml
..........\Calculator.iml
..........\app
..........\...\.gitignore
..........\...\app.iml
..........\...\build
..........\...\.....\generated
..........\...\.....\.........\res
..........\...\.....\.........\...\resValues
..........\...\.....\.........\...\.........\androidTest
..........\...\.....\.........\...\rs
..........\...\.....\.........\...\..\androidTest
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..........\...\.....\.........\source
..........\...\.....\.........\......\aidl
..........\...\.....\.........\......\....\androidTest
..........\...\.....\.........\......\....\...........\debug
..........\...\.....\.........\......\....\debug
..........\...\.....\.........\......\buildConfig
..........\...\.....\.........\......\...........\androidTest
..........\...\.....\.........\......\...........\...........\debug
..........\...\.....\.........\......\...........\...........\.....\com
..........\...\.....\.........\......\...........\...........\.....\...\lenarn
..........\...\.....\.........\......\...........\...........\.....\...\......\ray
..........\...\.....\.........\......\...........\...........\.....\...\......\...\calculator
..........\...\.....\.........\......\...........\...........\.....\...\......\...\..........\test
..........\...\.....\.........\......\...........\...........\.....\...\......\...\..........\....\BuildConfig.java
..........\...\.....\.........\......\...........\debug
..........\...\.....\.........\......\...........\.....\com
..........\...\.....\.........\......\...........\.....\...\lenarn
..........\...\.....\.........\......\...........\.....\...\......\ray
..........\...\.....\.........\......\...........\.....\...\......\...\calculator
..........\...\.....\.........\......\...........\.....\...\......\...\..........\BuildConfig.java
..........\...\.....\.........\......\r
..........\...\.....\.........\......\.\androidTest
..........\...\.....\.........\......\.\...........\debug
..........\...\.....\.........\......\.\debug
..........\...\.....\.........\......\.\.....\android
..........\...\.....\.........\......\.\.....\.......\support
..........\...\.....\.........\......\.\.....\.......\.......\v7
..........\...\.....\.........\......\.\.....\.......\.......\..\appcompat
..........\...\.....\.........\......\.\.....\.......\.......\..\.........\R.java
..........\...\.....\.........\......\.\.....\com
..........\...\.....\.........\......\.\.....\...\lenarn
..........\...\.....\.........\......\.\.....\...\......\ray
..........\...\.....\.........\......\.\.....\...\......\...\calculator
..........\...\.....\.........\......\.\.....\...\......\...\..........\R.java
..........\...\.....\.........\......\rs
..........\...\.....\.........\......\..\androidTest
..........\...\.....\.........\......\..\...........\debug
..........\...\.....\.........\......\..\debug
..........\...\.....\intermediates
..........\...\.....\..

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