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"JavaME + Android in action" CCT-CEJUG Dezembro 2008
 

"JavaME + Android in action" CCT-CEJUG Dezembro 2008

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Mini-cursos de JavaME e Android no evento do CEJUG Café com Tapioca, em Dezembro de 2008. ...

Mini-cursos de JavaME e Android no evento do CEJUG Café com Tapioca, em Dezembro de 2008.
1. Introdução: overview do desenvolvimento em Java para dispositivos portáteis/móveis
2. Java ME in action: tutorial hands-on de desenvolvimento (mini-curso)
3. Android in action: tutorial hands-on de desenvolvimento (mini-curso)
Autor: Vando Batista

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    "JavaME + Android in action" CCT-CEJUG Dezembro 2008 "JavaME + Android in action" CCT-CEJUG Dezembro 2008 Presentation Transcript

    • JavaME + Android in action Java Platforms for Mobility CEJUG CCT Coffee with Tapioca, December 2008 Vando Batista Some Rights Reserved
    • Objectivity Introduce the Java development platforms for mobile devices, JavaME and Android, performing implementations activities for each one, in a lab-style practice, with some APIs Target audience: Java developers interested on Mobile Platforms
    • Agenda • Overview on Mobile Platforms • Java ME in action • Android in action • Challenge
    • After this course you will… • identify mobile platforms characteristics • understand how to implement a JavaME application • understand how to implement a Android application • have implemented, at least, one application for each platform • maybe… win a book: Free Software and Digital Inclusion (in Portuguese)
    • Applications… • Location Based Systems • m-commerce, collaboration, marketing • Mobile Social Networks • Military • Search and safety On the move apps Improve user experience
    • Users: mobile vs. desktop • India: Many more mobile than desktop Web users (4 to 1), The Economic Times, Oct 2007
    • Motivation • Evolution, popularization – Device resources – Connectivity • Business applications for mobile devices – Growing 102% per year, until 2012 - Mobile Business Applications and Services, ABI Research • New services, new opportunities
    • Mobile Ecosystem Source: SDN - java.sun.com/javame
    • Mobile, Portable Devices
    • Mobile Networks 3G, 4G...
    • Development Platforms
    • Mobile Computing “Computing that deals with connection exploration on mobile devices” Coulouris, Dellimore, Kindberg. Distributed Systems (4th edition) Mobility transparency allows the movement of resources and clients within a system without affecting the operation of users or programs. Two flavours: migration and relocation
    • quot;small is the betterquot; • Challenges – Devices – Networks – Limitations and heterogeneity • Dependencies – Power: battery autonomy – Resource: connection availability “Remember that there is no code faster than no code” Taligent‘s Guide to Designing Programs
    • Mobile Development • Software Development Kit (SDK) – Emulator, Documentation, Tools, Services, etc. • Integrated Development Environment (IDE) • IDE Plugins
    • Are you ready? Set your environments! http://www.cejug.org/display/cejug/Ambiente+para+os+mini- cursos+de+JavaME+e+Android
    • Welcome to the… JavaME Development
    • Introduction • Java Platform, Micro Edition – Java Community Process (JCP) based – Java Specification Request (JSR) • Reference Implementation (RI) • Test Compatibility Kit (TCK) • Proprietary APIs • Native Applications • Since 2000 • 80% handsets: 1.2bi phones, 1200 models, 180 carriers
    • Architecture • JVM, KVM Source: SDN - java.sun.com/javame
    • Core APIs • Configuration – CLDC, CDC, BD-J • Profile – MIDP, IM, PP, PBP, FP • Umbrella – Fragmentation: Computational, Physical, Functional – JTWI, MSA (Full, Subset)
    • Development Infrastructure • Many environments: handset dependency • For this lab: – SDK: Sun WTK 2.5.2, JME SDK 3.0 – IDE: Eclipse Ganymede (3.4) – Plugin: Mobile Tools for Java 0.9 • Unified Emulator Interface (UEI)
    • Hello JavaME World! • build, obfuscate, preverify, run, debug, and deploy • Create a project • Project structure • Create a MIDlet – javax.microedition.midlet.MIDlet • Over the Air (OTA) / installation • On Device Deployment/Debug • MIDlet.this.platformRequest(“tel:*”)
    • MIDlet Lifecycle • Application Management Software (AMS) – Java Application Manager (JAM) • notifyDestroyed() • notifyPaused() • resumeRequest()
    • MIDlet Lifecycle Coding import javax.microedition.midlet.MIDlet; public class HelloWorld extends MIDlet { public HelloWorld() { System.out.println(“MIDlet constructorquot;); } protected void destroyApp(boolean arg0) { System.out.println(quot; MIDlet destroyApp()quot;); } protected void pauseApp() { System.out.println(quot; MIDlet pauseApp()quot;); } protected void startApp() { System.out.println(quot; MIDlet startApp()quot;); } }
    • Application Packaging • Profile dependent • MIDlet Suite – Java ARchive (.JAR) – Java Application Descriptor (.JAD) • Package generation
    • Application Configuration • Java Application Descriptor (.JAD), Manifest • MIDlets • Permissions • Properties: – System System.getProperty(“javax.microedition.*”) – Application MIDlet.this.getAppProperty(quot;propertyNamequot;)
    • Code Optimization • Free objects • String Vs. StringBuffer • Arrays Vs. Collection • Moderate use – Synchronized – Instance variables – Parameter number – Resources initiation – Interfaces, internal classes • JAR obfuscation, compression
    • GUI Source: IBM - ibm.com
    • GUI Coding public class HelloWorld extends MIDlet { private Display display; private Form myForm; // initialization on MIDlet constructor public startApp() { display = Display.getDisplay(this); // display.getCurrent(); display.setCurrent(myForm); } ... }
    • Keyboard Handling • Components – javax.microedition.lcdui.CommandListener – javax.microedition.lcdui.Command • Registration – setCommandListener(CommandListener l) • Notification – commandAction(Command c, Displayable d) {} • Potential deadlock: operations such as IO and networking should run on a separate thread
    • Keyboard Handling Coding public class HelloWorld extends MIDlet { Displayable d = new TextBox(“Title”, “Body”, 20,TextField.ANY); Command c = new Command(“Exit”, Command.EXIT, 0); d.addCommand(c); d.setCommandListener(new CommandListener() { public void commandAction(Command c, Displayable s) { doSomeAction(); } } ); }
    • Persistent Storage • Record Management System (RMS) – javax.microedition.rms.* • RecordStore • RecordEnumeration • RecordComparator • RecordFilter
    • Persistent Storage Coding ... RecordStore rs = null; String value = quot;Java ME in actionquot;; ... try { rs = RecordStore.openRecordStore(“RecName”, true); byte[] recData = value.getBytes(); rs.addRecord(recData, 0, recData.length); String data = new String(rs.getRecord(1)); } catch (Exception e) { ... }
    • Connectivity • Generic Connection Framework (GCF) – javax.microedition.io.* • Remote (Infrastructured) – HTTP, HTTPS – TCP, UDP – Wireless Messaging (JSR120, 205) – Push Registry (MIDP) – SIP (JSR180) • Local (Ad hoc) Source: SDN - java.sun.com/javame – JABWT (JSR 82) – Ad Hoc Networking API (JSR 259)
    • Connectivity Coding HttpConnection httpConn = null; InputStream = null; try { httpConn = (HttpConnection) Connector.open(quot;http://www.cejug.orgquot;); httpConn.setRequestMethod(HttpConnection.GET); httpConn.setRequestProperty(quot;User-Agentquot;, quot;Profile/MIDP-2.0 Configuration/CLDC 1.1quot;); is = httpConn.openInputStream(); int ch = -1; while((ch = is.read()) != -1){ ... } …
    • References • Mobile and Embedded Guide to JavaOne 2008 – http://wiki.java.net/bin/view/Mobileandembedded/JavaO ne2008 • A Survey of Java ME Today – http://developers.sun.com/mobility/getstart/articles/surv ey/ • Java ME Device Table – http://developers.sun.com/mobility/device/ • JEDI course (DFJUG) – http://jedi.wv.com.br
    • Welcome to the… Android Development
    • Open Handset Alliance Manufactures Semiconductors Carriers Content Software
    • Introduction • Software stack – Operating System • Linux Kernel (v2.6) – Middleware • Services – Applications HTC Dream (G1) • Java • Dalvik: custom virtual machine for embedded • Since 2008
    • Characteristics • Applications… – without borders – are created equal – can run in parallel – can easily embed the web • Open source – http://source.android.com • Apache 2.0 and GLP v2 license
    • Architecture
    • Basic Components • Activity – UI component (Form like) typically corresponding to one screen • Intent Receiver – Set and respond to an external event: notifications or status changes. Can wake up your app • Services – Task without UI that runs in the background • Content Provider – Allow applications to share data
    • Packages android.util android.telephony android.os android.hardware android.graphics android.text android.net.wifi android.database android.location android.content android.media android.view android.opengl android.widget android.app
    • Development Infrastructure • Recommended environment • For this lab: – SDK: AndroidSDK 1.0 • QEMU-based (system image) – IDE: Eclipse Ganymede (3.4) – Plugin: Android Development Tool 0.8, WST • Add to environment variable PATH – tools directory • A lot of XML for application, activity, intent, layout, view, variable
    • Hello Android World! • Create a project • Create an Activity – android.app.Activity • Project structure • LogCat • Deployment/Debug
    • Application Configuration • AndroidManifest.xml • Application – Activity, Intent Filter • Permissions <?xml version=quot;1.0quot; encoding=quot;utf-8quot;?> <manifest xmlns:android=quot;http://schemas.android.com/apk/res/androidquot; package=quot;org.cejug.androidquot; android:versionCode=quot;1quot; android:versionName=quot;1.0.0quot; android:screenOrientation=quot;landscapequot;> ...
    • Application Anatomy • Activity – Can reuse functionality from other components by making a request in the form of an Intent – Can be replaced at any time by a new Activity with an equivalent IntentFilter • Intent – Request to do something: move from screen to screen. Activity.startActivity(myIntent) • Intent Filter – Description of Intent types
    • Application Configuration ... <application android:icon=quot;@drawable/iconquot; android:label=quot;@string/app_namequot;> <activity android:name=quot;.HelloActivityquot; android:label=quot;@string/app_namequot;> <intent-filter> <action android:name=quot;android.intent.action.MAINquot; /> <category android:name=quot;android.intent.category.LAUNCHERquot; /> </intent-filter> </activity> <activity android:name=quot;.HelloListActivityquot; android:label=quot;ListActivityquot;> </activity> </application> </manifest>
    • • Activities are stacked • Only one is active • Only one is open
    • Application Coding public class HelloActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); TextView tv = new TextView(this); tv.setText(quot;Hello, Androidquot;); setContentView(tv); ... } } • onStart(), onResume(), onPause(), onStop(), onRestart(), onDestroy()
    • SDK Tools • Emulator • Dalvik Debug Monitoring System (ddms) • Android Debug Bridge (adb) • Android Asset Packaging Tool (aapt) • Android Interface Description Language (aidl) • sqlite3 • Traceview • mksdcard • dx, activitycreator, and others
    • Application Packaging/Deployment • APK file – .DEX • Log into a Linux server via a shell • Installation – adb install Application.apk – Uninstall • adb shell (remove file from /data/app/)
    • GUI • Define in: code or XML • res/layout • Views – Text, Edit, List – Image, Web, Map • Layouts – Frame, Linear, Relative, Table, Absolute
    • res/layout/main.xml - Views <LinearLayout xmlns:android=quot;http://schemas.android.com/apk/res/androidquot; android:orientation=quot;horizontalquot; android:layout_width=quot;fill_parentquot; android:layout_height=quot;wrap_contentquot; android:background=quot;@drawable/iconquot;>
    • res/layout/main.xml - Layouts <Button android:id=quot;@+id/callButtonquot; android:layout_width=quot;fill_parentquot; android:layout_height=quot;wrap_contentquot; android:text=quot;Show Dialerquot; /> <EditText android:id=quot;@+id/phoneNumberquot; android:layout_width=quot;fill_parentquot; android:layout_height=quot;wrap_contentquot; />
    • Event Handling Coding … final EditText phoneNumber = (EditText) findViewById(R.id.phoneNumber); Button callButton = (Button) findViewById(R.id.callButton); callButton.setOnClickListener(new Button.OnClickListener() { public void onClick(View v) { Intent CallIntent = new Intent(Intent.ACTION_CALL, Uri .parse(quot;tel:quot; + “+5585quot; + phoneNumber.getText())); CallIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); startActivity(CallIntent); } });
    • Emulator: No support for… • Placing or receiving actual phone calls • USB connections • Camera/video capture (input) • Audio input • Determining connected state • Determining battery charge level / AC state • Bluetooth
    • References • Android Documentation – http://code.google.com/android • Android A Programmers Guide (Jerome DiMarzio, Mc Graw Hill) • Professional Android Application Development (Reto Meier, Willey Publishing) • Many sites, forums, videos, screencasts, presentations…
    • Would you like to be challenged? Practice matters!
    • Challenge Requirements • Based on our lab practice • Create an application on JavaME or Android platform following the requirement – Receive a user text input through a wizard
    • Questions & Answers
    • Thank you! Vando Batista vandofb at gmail.com msn: vfbatista at hotmail.com skype: vfbatista