Nokia Asha App Development - Part 1

App Development for Nokia Asha Devices with Java ME

Marlon Luz - INdTNokia Developer Evangelist

@marlonluz

WHAT IS THE

INdT?

mobile tecnologies and internet

for areas related to

with focus in development of

new concepts, products & solutions

CENTER OF

RESEARCH & DEVELOPMENT

nonprofit

CENTER OF

RESEARCH & DEVELOPMENT

nonprofit

Training Content

• Nokia App Store• Nokia Platforms• Introduction to Java ME Development• High Level UI components• Data storage• Publishing your App

Nokia App Store

Nokia App Store, Series40 & JavaME

120k+ apps, 15m downloads/day

Brasil: 150m downloads (total),

50m in 2012, 500k per day, 56%

in Series 40, 73% of purchases are JavaME apps

Nokia Platforms

Silverlight, XNA

Java apps PhonesSeries 40

Mobile Platforms

http://gs.statcounter.com/#mobile_os-ww-monthly-201201-201212

Mobile Platforms

http://gs.statcounter.com/#mobile_os-af-monthly-201201-201212

Mobile Platforms

http://gs.statcounter.com/#mobile_os-as-monthly-201201-201212

Nokia SDK 2.0 for Java• Emulates the device

environment• Location, contacts,

etc.• Emulates mobile

events like battery, sms, etc.

• IDE Integration

Development• IDE Installation• Overview JavaME• First Project

• Java Micro Edition (ME) is the Java for devices with limited resources

• Java ME brings a common platform for devices like:• Mobile phones• Pagers• PDAs• Set-top boxes

• Java ME defines a set of configurations, profiles e optional APIs;

• Java ME enables the developers to create applications for a large number of devices;

JavaME Overview

• Support a wide variety of products that fit within the scope of J2ME;

• Defines a Java platform for a wide variety of devices, also defines a JVM (Java Virtual Machine) and the minimum set of class libraries available:• Connected Device Configuration (CDC)• Connected Limited Device Configuration (CLDC)

Configurations

• 128 kilobytes of memory to run Java;• 32 kilobytes for memory allocation in

runtime;• No user interface;• Low power processing, battery enabled

device;• 16-32 Mhz Processor

CLDC

• Needed APIs to develop applications for a specific set of devices• MIDP• IMP• PBP• ...

Profiles

• Mobile Information Device Profile; • MIDP defines the following set of classes:• Application Lifecycle Package• User Interface Package• Persistence Package• Networking Package• Language and Utility Packages

MIDP

CLDC or KVM

CLDC Core classes

Mobile

Info

rmatio

nD

evice

Pro

file

Persiste

nt

Sto

rag

e

Netw

orkin

g

Use

rIn

terfa

ce

MID

let

APIs

• 3 versions available:

MIDP

MIDP 1.0 MIDP 2.0

Memory Requirement At least 200KB At least 256KB

High/Low-Level UI

Network API

Persistent Storage API

Game API

Secure networking

Push Registry

Signed MIDlets

• Apps Java that run on MIDP devices are known as MIDlets

• MIDlets are defined in the javax.microedition.midlet package

• Child of the abstract class javax.microedition.midlet.MIDlet

• Life cycle defined and managed by methods implemented in the MIDlet;

MIDlets

MIDlets• An application manager controls the MIDlet

running• The MIDlet behavior is controlled by a life cycle

through methods that a MIDlet has to implement

Destroyed

Paused ActivestartApp()

pauseApp()

destroyApp() destroyApp()

default constructor()

MIDlets• The platform can change the state from Active

to Paused at any time

Destroyed

Paused Active

startApp()

pauseApp()

destroyApp() destroyApp()

MIDlets• The method destroyApp() of a MIDlet is called

when the platform needs shutdown a MIDlet

Destroyed

Paused Active

startApp()

pauseApp()

destroyApp() destroyApp()

MIDlets• Let´s see how to code a MIDlet

#stopTalking#startCoding

JAD and JAR• JAD (Java Application Descriptor)

• Provides information on the content of a JAR file

• JAR (Java Archive)• Packaging various kinds of information (classes,

images, audio, data)

• Attributes JAR/JAD

Development processDevelopment Station

MyMIDlet.java

javac

MyMIDlet.class

MyMIDlet.class

MyMIDlet.jar

MyMIDlet.jad

Target Devices

preverify

jar

Download/deploy

Download/deploy

Marlon Luzext-marlon.luz@nokia.com

@marlonluz

Thanks