Using Ruby in Android Development

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Using Ruby for Android

Development

Rhomobile – Mobilize Your Enterprise Apps

Background

Android is a big step forward in mobile operating systems

But… Java?

Dynamic script languages are more productive And don’t have to be too slow

Four main ways to leverage Ruby…


Leveraging Ruby for Android

Scripting: automate phone tasks and testing

“From scratch” app development replace Java

Framework development Less Ruby, compiled Ruby

App integration Full Ruby via server


Ruboto

http://github.com/ruboto Ruboto-core

[sudo] gem install ruboto-core

Ruboto-core-irb

Ruboto-demos

* Ruboto slides here derived from earlier presentations by Daniel Jackoway. Apologies for missing attribution in original post.

http://github.com/ruboto


Android in Ruby

public void Activity.onCreate(Bundle bundle)

public void Activity.onPause()

public void onClick(View view)

handle_create do |bundle|handle_pause dohandle_click do |view|


How It Works

YourActivity < RubotoActivity < Activity

• RubotoActivity implements callbacks

• They tell Ruby to exec blocks, pass params along


Ruby for Scripting: IRB

• http://www.appbrain.com/app/ruboto-irb-%28ruby-on-android%29/org.ruboto.irb

• Activities only

• Can’t ship .apk

http://www.appbrain.com/app/ruboto-irb-(ruby-on-android)/org.ruboto.irb

http://www.appbrain.com/app/ruboto-irb-(ruby-on-android)/org.ruboto.irb


Ruboto-core

• Goals

• Anything you can do with Java

• Zero Java

• Zero XML

• Support plugins


Ruboto Install

• JDK

• JRuby (rvm)

• Android SDK

• Generate an emulator

• gem install ruboto-core


Ruboto App Generation

• $ ruboto gen app \

• $ --package com.adamblum.andevcon \

• $ --path andevcon \ # where app files go

• $ --name andevcon \ # Name of app

• $ --target android-8 \ # Froyo

• $ --activity MyActivity # Name of Activity


Ruboto Activity

• assets/scripts/my_activity.rb

• require 'ruboto.rb’

• ruboto_import_widgets :TextView,

• :LinearLayout, :Button

• $activity.handle_create do |bundle|

• setTitle 'This is the Title’


Ruboto Activity (continued)

• setup_content do

• linear_layout :orientation => LinearLayout::VERTICAL do

• @text_view = text_view :text => "What hath Matz wrought?"

• button :text => "M-x butterfly", :width => :wrap_content

• end

• end

• handle_click do |view|

• if view.getText == 'M-x butterfly'

• @text_view.setText "What hath Matz wrought!"

• toast 'Flipped a bit via butterfly'

• end

• end

• end


Install

• $ rake install # builds .apk, installs to emulator

• $ rake; adb -d install -r bin/*-debug.apk


Ruby for An App Framework…Rhodes

Portability Write it once and it runs on all smartphones: BlackBerry, iPhone,

Windows Mobile, Android, Symbian, Win32

Leverage Your Web Skills Build the app quickly in HTML and Ruby

Offline Use and Easy Backend Integration Work with synchronized local data when offline

Easily connect to any backend app through web services

Exploit device capabilities GPS, PIM data, camera, push/SMS, native mapping, barcode,

signature capture, …

Enterprise Security Compliant Encrypt data on the device, remote wipe of device, secure

authentication…


Rhodes Architecture

RhoSyncServer

RhoSyncServer

your app code

RhoSync client

RhoSync client

ORM (Rhom)ORM (Rhom)

Rhodes components

Rubyexecutor

Rubyexecutor

HTML templates

HTML templates

model

controllercontroller

model

HTML templates

HTML templates

controllercontroller

Backendapp

Backendapp

sourceadapter

sourceadapter

Backendapp

Backendapp

model

model

We provide:We provide:

You write:

Rhodesapp

generator

Rhodesapp

generator

Backendapp

Backendapp

Devicecapabilities

Devicecapabilities

smartphone device


Rhodes vs. Competition

Only one that supports all devices

Only one with synchronized data

Only MVC framework

First Ruby on the device

First and only hosted development service for mobile


Ruby for App Integration…RhoSync

[sudo] gem install rhosync

Write a “source adapter” Query

Create

Update

Delete

Eliminates many tasks in app integration No device integration/connection code (assumes in

database)

Removes data storage step

If its Rails backend, not even source adapter is necessary

Better user experience Data is realtime updated

No wait for data to be retrieved


RhoSync Source Adapter

rhosync app YourApp

cd YourApp

rhosync source Product

Generates …class Product <SourceAdapter

def query(params=nil)

# TODO: Query your backend data source and assign the records

# to a nested hash structure called @result. For example:

end

def create(create_hash,blob=nil)

# TODO: Create a new record in your backend data source

end

end


RhoHub

First and only “Development as a Service for mobile”

More than 10,000 developers signed up in the last year ~100 more per day

Hosted development – WRITE APPS FOR IPHONES FROM WINDOWS Web-based IDE for ease of use

Build for all smartphones online – no need to install SDKs

Hosted runtime No need to set up RhoSync server

Collaboration Work with other developers

on same project over the web


Resources

• http://github.com/ruboto

• http://docs.rhomobile.com

• http://rhomobile.com/products/rhodes

• http://rhomobile.com/products/rhosync

• http://rhohub.com

• [email protected]

http://docs.rhomobile.com/

http://docs.rhomobile.com/

http://rhomobile.com/products/rhodes

http://rhomobile.com/products/rhodes

http://rhohub.com/

Using Ruby in Android Development

Technology

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