Ruboto – Ruby on Android

1. Ruboto – Ruby on Android

2. Introduction • Ruby on Android • Rhodies • Scripting layer for Android • Rhuboto • Goal of Ruboto • Make Jruby a first class language on Android

3. Flow of Ruboto

4. Ruby and Java • Ruboto is a framework for writing full Android apps in Ruby. • It includes support libraries and generators for creating projects, classes, tests, and more. • Ruboto expose the complete Android API • we use Java source in a Ruboto project • we add ruby source to a Java Android project

5. Advantage of Ruboto And JIT • Ruboto project IS an Android Java project. You can choose which parts of the app you want to write in Ruby, and which parts you want to write in Java. • Developing in Ruby allows you a quick development cycle and more maintainable code • Developing in Java allows for higher performance. • Right now we have the dexmaker.jar based Dalvik byte code generation which is used for generating subclasses of Java classes.

6. Include Jruby • Include the --with-jruby flag when you create your app with ruboto gen app • After generating an app you can type ruboto update jruby --force and the two jars will be included in your libs directory. You will have to have the jruby-jars gem installed in your Ruby installation. • If you would like to remove JRuby from your app, just delete libs/jruby-*.jar from your project.

7. JIT and Size • Ruboto not support JIT compilation to Dalvik byte code • Right now we have the dexmaker.jar based Dalvik byte code generation which is used for generating subclasses of Java classes. • A "Hello World" type application (apk) is less than 40KB. The application installed on the device is less than 100KB • Ruboto Core platform app installed, which adds just above 9MB of installed disk space. • Adding the dx library for JIT compilation would add up to 747KB.

8. RUBOTO-irb • This is a Developer tool for check the code on devise befor developing app • start demo-irb-server.rb file • adb forward tcp:8005 tcp:8005 • Localhost:8005 on browser

9. Prerequisites

10. Installations • java&Ant • http://www.oracle.com/technetwork/java/javase/downloads/index.html • Sudo apt-get install ant1.8 (for ubuntu) • http://ant.apache.org/bindownload.cgi • Ruby,Ruby gems and Rake • Use of jruby is optional • gem install ruboto • Gem install rake • Android sdk and plat forms • http://developer.android.com/sdk/index.html • add the sdk's tools/ and platform-tools/ directory to your $PATH • dx –version android -s create avd -f -n Android_4.1 -t android-16 --sdcard 64M emulator -avd Android_4.1 • Gems:ruboto-core & jruby-jars • gem install ruboto-core • gem install jruby-jars

11. Generate app • ruboto gen app --package com.yourdomain.whatever --path path/to/where/you/want/the/app --name NameOfApp --target android-version --min-sdk another-android-version --activity MainActivityName • --path --> Path of app folders to generate • --name --> Name of app ( custom edit) • --target --> Target android version • --min-sdk --> minimum sdk supported fotr this app • --activity --> Main activity class name • --with-jruby --> includes jruby jars in lib/

12. Simple button click app • ruboto gen app --package com.ruboto.buttonclick • You can see the default folders and files generated • edit the code on src/buttonclick_activity.rb with the code • Refer:- buttonclick.zip/src/buttonclick_activity.rb

13. Use of Sqlite Databade app • ruboto gen app --package com.ruboto.sqlite • You can see the default folders and files generated Create a new file Gemfile.apk, and add the code Refer:- sqlite.zip/Gemfile.apk Configure load path Create a new file src/config.rb, and add the code Refer:- sqlite.zip/src/config.rb Then add this line just below the top of src/sqlite_ar_activity.rb: require 'config' Configure database Create a new file src/android_logger.rb Refer:- sqlite.zip/src/android_logger.rb

14. Use of Sqlite Databade app Create a new file src/database.rb Refer:- sqlite.zip/src/database.rb Load the file at the end of src/config.rb with_large_stack{require 'database'} Create a new file src/migrate.rb MIGRATION_PATH = File.expand_path("#{SRC_DIR}/migrate") puts "Looking for migration scripts in #{MIGRATION_PATH}" migrator = ActiveRecord::Migrator.new(:up, MIGRATION_PATH) if migrator.pending_migrations.size > 0 puts "Found #{migrator.pending_migrations.size} migrations." migrator.migrate End Load the file at the end of src/config.rb with_large_stack{require 'migrate'}

15. Use of Sqlite Databade app Create a new file in src/migrate/001_create_people.rb Refer:- sqlite.zip/src/migrate/001_create_people.rb Add data and display table Create a new file src/person.rb class Person < ActiveRecord::Base validates_presence_of :name validates_uniqueness_of :name End

16. Use of Sqlite Databade app Edit src/sqlite_ar_activity.rb to Refer:- sqlite.zip/src/sqlite_ar_activity.rb

17. Spy cam App • ruboto gen app --package com.ruboto.spycam • You can see the default folders and files generated • Add a new file src/spycam_server.rb: Refer:- spycam.zip/src/spycam_server.rb Add permissions Add the following lines to you AndroidManifest.xml file, just after the uses_sdk tag: <uses-permission android:name="android.permission.CAMERA"/> <uses-permission android:name="android.permission.INTERNET"/> <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /> <uses-feature android:name="android.hardware.camera"/> <uses-feature android:name="android.hardware.camera.autofocus"/> Refer:- spycam.zip/AndroidManifest.xml

18. Spy cam App Activate the web server Edit src/spycam_activity.rb to this: Refer:- spycam.zip/src/spycam_activity.rb Take a picture Add a new file src/camera_helper.rb: Refer:- spycam.zip/src/camera_helper.rb Ater Deploy app with command from root directry Rake install The app should restart and show two lines of information: Server: WEBrick started on http://xxx.xxx.xxx.xxx:4567/ Picture: Point a web browser to the given URL. You should get a web page with a picture from the camera. Click the camera to update the picture.

19. Issues • Issues • Startup sppd • Stack limits • Appsize • Compiling Ruby • Generating Byte code

20. Limitations • Mobile hardware Limitations(Memory Stack limit) • Delvik VM (jar include) • Requesting control from java • Jruby exes components • Android resourrce framework(Losing Dynamic programing)

21. Thank you

22. Any Queries