Use Ruby to Write (and Test) Your Next Android App

USE RUBY TO WRITE (AND TEST) YOUR

NEXT ANDROID APP
Joel Byler
Software Craftsman
@joelbyler
June 1, 2013
Pittsburgh TechFest
La Roche College
Saturday, June 1, 13

WHO AM I?

JOEL BYLER
 Software Craftsman
 Organizer for CleRb
 Enterprise Java Developer
 Relatively new to Ruby
 ... and Android

NEW TO ANDROID AND RUBY???
 Software Craftsmanship
Reduce risk with TDD / ATDD
 <3 Ruby and want to learn more
 <3 Mobile apps, who doesn’t?
Warning: this may turn out to be a lot of code to absorb in a short
amount of time. Slides and code will be made publicly available

RUBY ON ANDROID USING RUBOTO
JRuby optimized for the Android OS
 JRuby is a JVM language
 Android uses something like the JVM
but actually Dalvik VM
=+
<<< MAGIC >>>

IRB ON YOUR ANDROID DEVICE
 Interactive Ruby Shell
 Edit and run scripts in Android
 demo...

PERFORMANCE CONSIDERATIONS
Other than initial startup to load
JRuby, the performance of the app
appears to be as good as many
native Android apps

RUBOTO CORE
 A separate app available on the
Google Play Store
 Allows Ruboto Runtime (JRuby
on Dalvik VM) to be shared
 An alternative would be to use
the --with-jruby option
Decisions, decisions...

HOW DOES THIS
MAKE YOU FEEL?
This is what your users will
see if they don’t already have
the Ruboto Core installed
Using the --with-jruby
option will add ~10mb
to the size of your app
or

CREATE A NEW PROJECT
Ruboto Application Generator
$ ruboto gen app --package com.leandog.mastermind.ruboto
--name MasterMindRuboto --target android-15
--with-jruby --path=RubotoMasterMind
This will generate application with
'What hath Matz wrought?' sample code.

RUBOTO CLASS GENERATOR
Ruboto Class Generator
$ ruboto gen class Activity --name MasterMindMainActivity
This will generate code for the activity and add it to
the project manifest.
You can also use this to generate a
BroadcastReceiver or Service class

YOUR GENERATED APP

YOUR GENERATED CODE (RUBY .RB)

YOUR GENERATED TEST (ALSO .RB)

RAKE INSTEAD OF ANT
$ rake install start
Install the project on a device or emulator and start
it running.
$ ant debug
$ adb install example.apk
$ adb shell am start -n com.foo.bar...
$ rake update_scripts
Install the project on a device or emulator and start
it running.
$ adb install example.apk
$ rake -T List other available rake tasks

ADD IN THE ATDD
$ gem install testgen
This is one of @chzy 's testing gems
$ testgen project yourapp --with-gametel
This will add everything you need to use cucumber
to test your Ruboto app

NOW FOR SOME UNIT TESTS
$ mkdir spec This is where your specs will live
Add rspec to Rakeﬁle (created by testgen)

UNIT TESTING
Use rspec to test your ruby code, just like you
normally would.
rspec
JUnit 3
rake spec

INTEGRATION TEST?
Instruments and installs app on device when running
rake test
similar to ActivityInstrumentationTestCase2

ACCEPTANCE TESTING
Feature: Input Screen
Scenario: Welcome the user
When the application launches
Then I see "Enter four numbers below and submit your guess"
Scenario: User can guess
Given I enter 4 numbers
When I press the submit button
Then I see "Nice guess!"
rake features
Cucumber
Gametel
Brazenhead
ADB gem
class MainScreen
include Gametel
text(:number1, :index => 0)
def guess (first, second, third, forth)
number1 = first.to_s
number2 = second.to_s
number3 = third.to_s
number4 = forth.to_s
end
end
Then(/Î enter 4 numbers$/) do
on(MainScreen).guess 1, 2, 3, 4
end

YOUR RUBOTO CLASS FILES
 They're just .rb ﬁles
 Allows you to make changes without a full
rebuild
 fast feedback
 Ruboto uses ruby classes that are backed by java
classes for improved performance.
 Can still reference Java resources
example:
R::string::header_text

QUICK TOUR OF THE CODE
* Time permitting

THE RUBOTO COMMUNITY IS GROWING
Some of these projects are still young or have a small
user base.
- They will probably continue to change (improve)
- Ruboto is only version 0.12
Example:
Wasn't able to add a menu to the main activity. Instead
I had to wrap it with the 'launch' activity.
The good news is that they could deﬁnitely use YOUR
HELP!
Anyone up for trying to make the debugger work?

CONCLUSION
Ruboto is a great Open Source project with a
growing community that promises to get even
better.
Yes, it does increase your app's startup time
slightly, but offers a great dynamic nature for
rapidly changing apps.
Virtually all code can be Ruby, but can also
reference Java resources if you so desire.

RESOURCES
Sample Code
https://github.com/joelbyler/Ruboto-MasterMind
Ruboto
http://ruboto.org/
ATDD Training Resource
https://leanpub.com/cucumber_and_cheese
More In-Depth Personal Training
http://www.TestAutomationBootCamp.com/

DOMO ARIGATO MR. ROBOTO!
Fun fact:
domo arigato actually means
"Thanks a lot!"
in Japanese
http://en.wikipedia.org/wiki/Domo_arigato
So....
Domo Arigato!

THAT’S A WRAP!
Joel Byler
@joelbyler

COME FLOAT WITH US!
Located on a 10,000 square foot boat on the
Cleveland waterfront, our team exemplifies
how Agile values & principles are practiced.
Come float, deliver, and learn with us, or
leverage our expertise to help you change
your company culture.
@leandog www.leandog.com

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