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Building a SMS based application involves dealing with 3rd party service providers and mobile network operators. As you can imagine, this is time consuming and, given the cost structures in place, expensive. For quick prototypes it isn't worth the hassle. While waiting for your own short code, only hope would keep you together. However, we've seen the tremendous power and reach of SMS - especially for applications around a social theme at ThoughtWorks' Social Impact Program.EzSMS is our attempt at providing a SMS gateway that can be setup in minutes. Of course it runs on Ruby! All you need is an Android powered phone, a sim-card and data access. Thus it is very easy to prototype your apps. Gone are the days when we, Android owners, would feel alone. With Android activations outpacing births it seems that a hundred billion phones have found homes.In this talk we'll explore Ruboto and JRuby and quickly explain how to create a simple Android application. We'll explore the internals of our application and then compare Ruboto and other Ruby flavoured mobile app development frameworks. We'll also apologize to Sting for mishearing his song "Message in a bottle" .
Citation preview
EzSMS
Chandan JogHabibullah Pagarkar
Anand Agrawal
A simple SMS gateway for Androidin Ruby
Intended Take-Aways
Why SMS?
Your options for building an SMS based app
Quick introduction to Android
A taste of Ruby on Android
SMS is omnipresent
Logical choice and not a “hot new” technology
Caters to the technically un-savvy
SMS is powerful
MOTECH and mHealthSuite of services
Basic mobile phonesAntenatal and neonatal care
SMS is useful
In the cloud
Or, deal with them
DIY
Can your grandma get it up?
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We <3
We <3
Anatomy of an Android app
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Linux, but not quite
Linux kernel + Dalvik VM
No X. No GNU libraries. No JVM.
Activities
Visual components
Activities
An application consists of multipleloosely coupled Activities
Activities
An Activity is notified of change in state
through application life-cycle callbacks
Views and Layouts
Views and Widgets
Layout
Activity
Intent
Roughly analogous to a message
Intent
Use Intents to communicate
within components of an application
or between applications
Intent
Intent Filters
Explicit IntentsDesignate a target component by its
name
Implicit IntentsDo not name a target
Manifest
AndroidManifest.xml
Declaratively specify application components, services, permissions, minimum Android API version etc.
Service
BroadcastReceiver
ContentProvider
…
Open
DBAdapter.java
Whoa! It’s like, too much code, dude!
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Konnichiwa, Ruboto-san
Aims to make JRuby a first class Android citizen
Lends to easy scripting
Maps underlying Android layer
Flavour 1
ruboto-irb
Interactive environment on the phone
Flavour 2
ruboto-core
Packages Ruby scripts as an APK
Pre-reqs
JRuby
Android SDK
Ruboto
Application Generator
$ ruboto gen app --package com.yourdomain.whatever --path path/to/app --name AppName --target android-version --min-sdk another-android-version --activity MainActivityName
Class Generator
$ ruboto gen class BroadcastReceiver --name AwesomenessReceiver
Packaging Tasks
$ rake install
$ rake update_scripts
$ rake install:clean
And many more with rake -T
Poll Box
A simple feedback gathering application
http://Poll-Box.com
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How are we doing?
SMS 08800493714
code Y/N comment
ezsms Y The talk is awesome!
poll-box.com/response/102/ezsms
Talk is cheap
We’ll show youthe code
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Fork it
github.com/chandanjog/ez_sms
Good news everyone!
Use your existing Ruby knowledge
Type less ;)
Best of both worldsAndroid APIs
RubyGems
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Bad News
JRuby isn’t designed for constrained devices
Stack space limitations on the Dalvik VM
Ruboto doesn’t completely abstract away Android’s complexities
Slow JRuby start-up time
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