Non Conventional Android Programming (English)

Non-conventional Android Programming

Who am I? Davide Cerbo http://jesty.it http://davide.cerbo.born-to-co.de http://www.linkedin.com/in/davidecerbo [email_address]

http://www.pro-netics.it [email_address]

Once upon a time...

New Features

GPS
Compass
Camere
Hi-Res Screen
WI-FI
UMTS / HSPDA
Multi-touch

Where we going?

(market)

Too much devices

Many languages for many devices

IPhone: Objective C
Android: Java
BlackBerry: Java
Nokia/Symbian: Java e C++
Windows Mobile: .NET e C

Write once, run anywhere Do you remember?

PhoneGap HTML + JAVASCRIPT + CSS = PhoneGap.com

PhoneGap CROSS PLATFORM + API NATIVE INTERFACES + OPEN SOURCE = PhoneGap.com

What I'm able to do? ...and coming soon: camera, maps and file manager

Examples //GEO REFERENCING var getLocation = function () { var suc = function ( p ){ alert ( p . coords . latitude + " " + p . coords . longitude ); }; var fail = function (){ alert ( "Location not available!" );}; navigator . geolocation . getCurrentPosition ( suc , fail , undefined ); } //VIBRACALL navigator . notification . vibrate ( 0 ); //BEEEEEEP navigator . notification . beep ( 2 );

Examples //ACCELEROMETER var watchAccel = function () { var s = function ( a ){ document . getElementById ( 'x' ). innerHTML = roundNumber ( a . x ); document . getElementById ( 'y' ). innerHTML = roundNumber ( a . y ); document . getElementById ( 'z' ). innerHTML = roundNumber ( a . z ); }; var d = function (){}; var opt = {}; opt . frequency = 100 ; Timer = navigator . accelerometer . watchAcceleration ( s , f , opt ); } //CAMERA navigator . camera . getPicture ( dump_pic , fail , { quality : 50 }); function dump_pic ( data) { ... document . getElementById ( "test" ). src = "data:image/jpeg;base64," + data ; }

Where's the trick? PhoneGap give us a startup project for every supported device. Every project is a simple application made of a web browser that work as a fullscreen app and where javascripts object will be injected. These objects has native API counterpart inside the device. We need to copy html, css, javascript and images into a specific project folder for every device that we need to deploy on. We also need to modify the project configuration, like project's name, author and so on... For Android copy these files into: ../my-android/assets/www/

Just to explain... ...take a look at this piece of code extracted from DroidGap.java included in the Android startup project: private void bindBrowser(WebView appView) { gap = new PhoneGap( this , appView); geo = new GeoBroker(appView, this ); accel = new AccelListener( this , appView); launcher = new CameraLauncher(appView, this ); // This creates the new javascript interfaces for PhoneGap appView.addJavascriptInterface( gap , "DroidGap" ); appView.addJavascriptInterface( geo , "Geo" ); appView.addJavascriptInterface( accel , "Accel" ); appView.addJavascriptInterface( launcher , "GapCam" ); }

Why Android?

Open Source
Linux and Java based (Dalvik)
So many Devices
OS highly customized

?

Android 2.0 (Eclair) in deep

Multiple Google accounts management
Microsoft Excange Server support
Home, Menu and Back buttons become optional
New HTML5 web browser
Camera application improved (flash, digital zoom, etc...)
SMS and MMS are now searchable

MOTOROLA DROID http://droiddoes.com

What about Spring?

SpringME

Object configuration through XML
No reflection needed, auto-code generation
The final package does not contain extra libraries
Developed and maintained by Wilfred Springer, ex Tom Tom Software Architect
Apache MAVEN artifact plugin
Designed for J2ME but also suitable for GWT and Android

SpringME: how does it works?

Spring use reflection for Dependency Injection Class cl = Class.forName("Person"); Object instance = cl.newInstance(); Method meth = cl.getDeclaredMethod("setName"); method.invoke(instance, new Object[] { "Nick Hornby" }); --------------------------------------------------------- ClassPathXmlApplicationContext appContext = new ClassPathXmlApplicationContext(...); BeanFactory factory = (BeanFactory) appContext; Person frank = (Person)factory.getBean(“frank”);
SpringME produce the code through the Apache Maven plugin Person instance = new Person(); instance.setName("Wilfred Springer"); --------------------------------------------------------- BeanFactory factory = new BeanFactory(); Person frank1 = (Person)factory.getBean(“frank”); Person frank2 = factory.getFrank();

Android + Maven

Install the Android SDK
Setup the env variable ANDROID_SDK_15
Install Android into our maven repository , for example: mvn install:install-file -DgroupId=android -DartifactId=android -Dversion=1.5_r2 -Dpackaging=jar -Dfile=$ANDROID_SDK_15/platforms/android-1.5/android.jar
Let's create a brand new project: android create project --target 3 --name MavenAndroidExample --path ./maven-android-example --activity MavenAndroidActivity --package it.jesty.mavenandroid.example

Android + Maven

Create a pom.xml file (we'll see it in the next slide)
Let's clean up the mess: rm -r bin build.xml build.properties libs
Create the emulator: android create avd --name mavenandroidadv --target 3
Execute the emulator: emulator -avd mavenandroidadv
Create our package with: mvn install (.apk file)
Let's deploy the .apk into our device: mvn com.jayway.maven.plugins.android.generation2:maven-android-plugin:deploy

... <dependencies> <dependency> <groupId> android </groupId> <artifactId> android </artifactId> <version> 1.5_r2 </version> <scope> provided </scope> </dependency> </dependencies> <build> <sourceDirectory> src </sourceDirectory> <plugins> <plugin> <groupId> com.jayway.maven.plugins.android.generation2 </groupId> <artifactId> maven-android-plugin </artifactId> <version> 2.1.0 </version> <configuration> <sdk> <path> ${env.ANDROID_SDK_15} </path> <platform> 1.5 </platform> </sdk> <deleteConflictingFiles> True </deleteConflictingFiles> </configuration> <extensions> true </extensions> </plugin> ... Android + Maven

Android + Maven + SpringME

Modify the pom.xml adding the SpringME plugin
Create the application-context.xml into /context: <beans> <bean id="ciao" class="it.jesty....Greeting" scope="prototype"> <constructor-arg value="Ciao" /> </bean> </beans>
Create the Greeting.java class
Modify the MavenAndroidActivity.java: public void onCreate(Bundle savedInstanceState) { super .onCreate(savedInstanceState); TextView tv = new TextView( this ); tv.setText(((Greeting)new BeanFactory().getBean( "ciao" )) .to( "MavenAndroidActivity" )); //oppure: tv.setText(((Greeting)new BeanFactory().getCiao()).to(...)); }
Repeat 8 and 9 steps mvn com.jayway.maven.plugins.android.generation2:maven-android-plugin:deploy

... <resources> <resource> <directory>${basedir}/context/</directory> <filtering>true</filtering> <includes> <include>**/*.xml</include> </includes> </resource> <resource> <directory> ${basedir}/target/generated-sources/spring-me </directory> </resource> </resources> <plugins> <plugin> <groupId>me.springframework</groupId> <artifactId>spring-me-maven-plugin</artifactId> <version>1.0-SNAPSHOT</version> <executions> <execution> <goals> <goal>generate</goal> <goal>dot</goal> </goals> <phase>generate-sources</phase> </execution> </executions> <configuration> <contextFile> ${basedir}/context/application-context.xml </contextFile> <className> it.jesty.mavenandroid.example.BeanFactory </className> <dotFile>${basedir}/target/poloko-context.dot</dotFile> </configuration> </plugin> ...

Android + Maven + SpringME <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation=" http://www.springframework.org/schema /beans http://www.springframework.org/schema/beans/spring- beans-2.0.xsd" default-lazy-init="true" > <bean id="ciao" class="it.jesty...Greeting" scope="prototype" > <constructor-arg value="Ciao" /> </bean> <bean id="hello" class="it.jest...Greeting" scope="prototype" > <constructor-arg value="Hello" /> </bean> </beans>

Android + Maven + SpringME package it.jesty.mavenandroid.example; public class Greeting { private String greeting; public Greeting(String greeting){ this .greeting = greeting; } public String to(String to){ return this .greeting + ", " + to; } }

Links and resources:

Android http://www.android.com
PhoneGap http://phonegap.com
SpringME http://springframework.me http://sourceforge.net/projects/springme/
SpringME book http://www.scribd.com/doc/8611209/Spring-ME
Maven for Android http://code.google.com/p/maven-android-plugin http://code.google.com/p/masa
Android development guidelines http://developer.android.com/guide/practices/design/performance.html
Android, IPhone and IPod Touch Big Picture http://mashable.com/2009/09/15/iphone-android-apps-visualized/

Examples download: http://jesty.it/non-conventional-android-programming.zip The archive file contains: