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  • This session focuses on Java concepts that you will need in order to develop Android apps. It will serve as an overview of the fundamentals of the Java programming language, and compare and contrast it with other C-like languages like C, C++, C#, and Objective C. Also covered are the best sources for templates and libraries to speed up your learning curve!
  • http://en.wikipedia.org/wiki/Comparison_of_Java_and_Android_APIhttp://en.wikipedia.org/wiki/Dalvik_virtual_machinehttp://en.wikipedia.org/wiki/Oracle_v._GoogleIn May 2012 the jury in this case found that Google did not infringe on Oracle's patents, and the trial judge ruled that the structure of the Java APIs used by Google was not copyrightable.…On the primary copyright issue of the APIs, the court ruled that "So long as the specific code used to implement a method is different, anyone is free under the Copyright Act to write his or her own code to carry out exactly the same function or specification of any methods used in the Java API. It does not matter that the declaration or method header lines are identical.
  • http://www.zdnet.com/blog/burnette/java-vs-android-apis/504Supported java.io - File and stream I/Ojava.lang (except java.lang.management) - Language and exceptionsupportjava.math - Big numbers, rounding, precisionjava.net - Network I/O, URLs, socketsjava.nio - File and channel I/Ojava.security - Authorization, certificates, public keysjava.sql - Database interfacesjava.text - Formatting, natural language, collationjava.util (including java.util.concurrent) - Lists, maps, sets, arrays, collectionsjavax.crypto - Ciphers, public keysjavax.net - Socket factories, SSLjavax.security (except javax.security.auth.kerberos, javax.security.auth.spi, and javax.security.sasl)javax.sound - Music and sound effectsjavax.sql (except javax.sql.rowset) - More database interfacesjavax.xml.parsers - XML parsingorg.w3c.dom (but not sub-packages) - DOM nodes and elementsorg.xml.sax - Simple API for XMLNot supported These packages, normally a part of the Java 2 Platform Standard Edition, are not supported by Android.java.appletjava.awtjava.beansjava.lang.management
  • http://en.wikipedia.org/wiki/Dalvik_virtual_machinehttp://www.differencebetween.com/difference-between-android-and-vs-java/http://gamedev.stackexchange.com/questions/4288/how-different-is-java-for-jre-vs-java-for-androidFor C/C++ geeks, you can use NDK (Native Development Kit) but you need some Java bootstrap code and JNI knowledge
  • http://developer.android.com/sdk/installing.htmlhttp://www.eclipse.org/downloads/
  • http://developer.android.com/sdk/installing.htmlhttp://www.eclipse.org/downloads/
  • http://developer.android.com/sdk/installing.htmlhttp://www.eclipse.org/downloads/
  • http://developer.android.com/sdk/installing.htmlhttp://www.eclipse.org/downloads/
  • http://developer.android.com/sdk/installing.htmlhttp://www.eclipse.org/downloads/
  • http://en.wikipedia.org/wiki/Dalvik_(software)http://www.herongyang.com/Android/Project-dx-Command-Converting-class-Files-into-dex-File.html
  • Developer.android.com/tools/debugging/ddms.htmlhttp://www.brighthub.com/mobile/google-android/articles/25023.aspx
  • Source http://developer.android.com/images/system-architecture.jpg
  • Beg. Android dev 2011Pg 28
  • http://www.learn-android.com/2010/01/05/android-layout-tutorial/6/http://www.learn-android.com/2010/01/05/android-layout-tutorial/3/
  • http://sourceforge.net/directory/os%3Awindows/freshness%3Arecently-updated/?q=android&sort=popular
  • http://f-droid.org/repository/browse/?fdfilter=timesheet&fdid=com.tastycactus.timesheet

Transcript

  • 1. Java Essentials for AndroidPresented byAdrian MikeliunasAdrian@Mikeliunas.comTASKMobileSolutions.com
  • 2. Java Essentials for AndroidMoDevAcademyMoDevAcademy will offer professional training acrossplatforms that include beginner, intermediate andadvanced courses.The format will be one day courses that can be takenindividually or paired for a multi-day experience. TheAcademy intended to fill a much needed void in themarket for in-depth mobile developer training. 2
  • 3. Upcoming ClassesSchedule: • January 22nd: Starting up with iOS Development • January 23rd: Expert Objective-C • January 24th: Advanced Xcode DevelopmentRegister at MoDevAcademy.com/Registration
  • 4. Online ResourcesThe references in this presentation, and many otherresources are available at:http://Gomodev.com/MoDevAcademyResources
  • 5. Java Essentials for AndroidAgenda Java Similarities Java Differences Android Programming with Java in Eclipse Resources  Google Samples  F-droid.org  SourceFourge.net 5
  • 6. Java Essentials for AndroidAndroid & Java ComparisonsSimilaritiesDifferences 6
  • 7. Java Essentials for AndroidAndroid <> Java Android is Google’s Operating System, combining Linux with their own version of Java, named Dalvik Dalvik uses a subset of Harmony, an Apache Software Foundation project Dalvik is open-source software. Is the name of a fishing village in Iceland http://en.wikipedia.org/wiki/Dalvik_virtual_machine 7
  • 8. Java Essentials for AndroidAndroid/Java Similarities java.io - File and stream I/O java.lang - Language & exception Android uses Java syntax support java.math - Big numbers, rounding, precision Android uses similar APIs java.net - Network I/O, URLs, sockets java.nio - File and channel I/O java.security - Authorization, certificates, Android, supports a relatively public keys java.sql - Database interfaces large subset of the Java java.text - Formatting, natural language, collation Standard Edition 5.0 library … Java files on Android are compiled into .class files and then in dalvik executables(.dex) 8
  • 9. Java Essentials for AndroidAndroid/Java Differences Unlike Java VMs, which are stack machines, the Dalvik VM uses a register-based architecture Dalvik does not align to Java SE nor Java ME class library profiles Java is a programming language, while Android is a mobile phone platform 9
  • 10. Java Essentials for AndroidAndroid/Java Differences Android does not use the Abstract Window Toolkit nor the Swing library. User Interface is built using View objects Android layout behavior is encoded in the containers using XML files, unlike Java where Layout managers can be applied to any container widget Android relies on a master AndroidManifest.xml file  There is no Main class  You need to define default activity here  THIS IS A MANUAL METHOD 10
  • 11. Java Essentials for AndroidAndroid & EclipseSetupComponentsDevelopment 11
  • 12. Java Essentials for AndroidAndroid Development Setup - 1  Your Development Computer  Install Java Development Kit (JDK)  www.oracle.com/technetwork/Java/javase/ downloads/index.html  Install Eclipse Classic version  www.eclipse.org/downloads  Requirements:  Windows, Mac, or Linux developer.android.com/sdk/requirements.html 12
  • 13. JDKwww.oracle.com/technetwork/Java/javase/downloads/index.html 13
  • 14. Eclipse www.eclipse.org/downloads 14
  • 15. Android Development Setup - 2 Downloading the SDK Starter Package  Install Android SDK http://developer.android.com/sdk/index.html 15
  • 16. Android SDK Manager 16
  • 17. Java Essentials for AndroidAndroid Development Setup – 3a ADT Plugin for Eclipse  Start Eclipse  Select Help > Install New Software....  Click Add, in the top-right corner  In the Add Repository dialog that appears,  enter "ADT Plugin" for the Name  Location: https://dl- ssl.google.com/android/eclipse/  Click OK. 17
  • 18. Java Essentials for AndroidAndroid Development Setup – 3b  ADT Plugin for Eclipse  In the Available Software dialog, select the checkbox next to Developer Tools and click Next.  In the next window, youll see a list of the tools to be downloaded. Click Next.  Read and accept the license agreements, then click Finish.  When the installation completes,  Restart Eclipse! 18
  • 19. Java Essentials for Android Android Development Setup – 3c  Select Window > Preferences...  Select Android from the left panel  You may see a dialog asking whether you want to send usage statistics to Google. If so, make your choice and click Proceed. You cannot continue with this procedure until you click Proceed.  For the SDK Location in the main panel, click Browse... & locate your downloaded SDK directory  Click Apply, then OKhttp://developer.android.com/sdk/eclipse-adt.html#installing 19
  • 20. Java Essentials for Android Android Development Tools (ADT)The Android SDK includes several tools & utilities to help you create, test, & debug your projectsADT plug-in conveniently incorporates most of these tools into the Eclipse IDE, where you can access them from the DDMS perspective 20
  • 21. Java Essentials for AndroidADT Inventory The Android Emulator Dalvik Debug Monitoring Service (DDMS) Android Asset Packaging Tool (AAPT) Android Debug Bridge (ADB) 21
  • 22. Java Essentials for AndroidADT Inventory-2 The following additional tools are alsoavailable: SQLite3 A database tool Traceview Graphical analysis tool MkSDCard dx: java bytecode to Dalvik executable activityCreator Script 22
  • 23. Java Essentials for AndroidAndroid SDK  android.jar  Documentation  Samples directory  Tools directory  usb_driver 23
  • 24. • Eclipse Navigation • Package Explorer • Code Editor • Outline View • 2 4
  • 25. • Eclipse Tools-DDMS Dalvik Debug Monitor Service • 2 5
  • 26. Java Essentials for Android Android Emulator Create an Android Virtual Device Run it! 26
  • 27. Java Essentials for Android Android Architecture Applications Application framework Libraries Android Runtime (Dalvik VM) Linux 2.6 Kernel 27
  • 28. 28
  • 29. Java Essentials for Android Android Layers Linux kernel provides drivers for the Android hardware, networking, file system access & inter-process-communication Libraries are mostly written in C or C++ Core Libraries are the core development kit including utility, i.o. etc Dalvik Virtual Machine is an optimized Java VM Application Framework is the API to developers Applications are user facing programs 29
  • 30. Java Essentials for AndroidAndroid Applications• Each application runs in its own process, gets unique identifier & runs its own instance of Dalvik VM  This way the processes are isolated & crash of one application does not bring down the whole system! 30
  • 31. Android Programming System Level – modifying the Android system code & adapting it to various hardware platforms. It also involves creating additional services & features in the android system itself. C. C++ Application level – creating software products & services which sits on top of the Android software stack & interacts with the hardware through the underlying Android platform. Java. 31
  • 32. Java Essentials for Android Application Development Basics Activity  Presents visual interface to the user  Each activity has a separate window  to draw the visual component but if required it can use more than one window also Services  runs in the background and carries out some background process while the other visual component s are running in the foreground 32
  • 33. Java Essentials for Android Application Development Basics-2 Broadcast receivers  responsible for receiving and reacting to broadcasted messages Content providers  This provides specific set of data from one application to other applications. Used in conjunction with Content resolver which provide methods for inter process communication Widgets  These are programs anchored to the home screen providing information updated fairly frequently 33
  • 34. Android ActivitiesEach Android application must designate a default activity withinthe Android manifest file
  • 35. 35
  • 36. Android Activity ClassThe Activity base class defines a series of events that governs the life cycle of an activity:onCreate() — Called when the activity is first createdonStart() — Called when the activity becomes visible to the useronResume() —when the activity starts interacting with the useronPause() —current activity is being paused & the previous activity is being resumedonStop() —when the activity is no longer visible to the useronDestroy() — Called before the activity is destroyed by the system (either manually or by the system to conserve memory)onRestart() —when the activity has been stopped & is restarting 36
  • 37. Android Activity Class (2)public void onStart() { super.onStart(); Log.d(tag, ―In the onStart() event‖); }public void onRestart() { super.onRestart(); Log.d(tag, ―In the onRestart() event‖); } 37
  • 38. Android Activities To create an activity, you create a Java class that extends the Activity base class: package com.example.Activities; import android.app.Activity; import android.os.Bundle; public class MainActivity extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); } } 38
  • 39. Android Activities-2 Your activity class would then load its UI component using the XML file defined in your res/layout folder. In this example, you would load the UI from the main.xml file: setContentView(R.layout.main); Every activity you have in your application must be declared in your AndroidManifest.xml file 39
  • 40. Android Activities (3)<?xml version=‖1.0‖ encoding=‖utf-8‖?><manifest xmlns:android=‖http://schemas.android.com/apk/res/android‖ package=‖com.example.Activities‖ android:versionCode=‖1‖ android:versionName=‖1.0‖> <application android:icon=‖@drawable/icon‖ android:label=‖@string/app_name‖> <activity android:name=”.MainActivity” android:label=‖@string/app_name‖> <intent-filter> <action android:name=‖android.intent.action.MAIN‖ /> <category android:name=‖android.intent.category.LAUNCHER‖ /> </intent-filter> </activity> </application> <uses-sdk android:minSdkVersion=‖9‖ /></manifest> 40
  • 41. Android Layouts An Android layout is a class that handles arranging the way its children appear on the screen  Anything that is a View (or inherits from View) can be a child of a layout All of the layouts inherit from ViewGroup (which inherits from View) so you can nest layouts  You could also create your own custom layout by making a class that inherits from ViewGroup 41
  • 42. The Android Layouts are: AbsoluteLayout FrameLayout LinearLayout RelativeLayout TableLayout 42
  • 43. Java Essentials for AndroidAndroid Resources Google Samples F-droid.org sourceforge.net 43
  • 44. Java Essentials for Android Example: Timesheet Timesheet is an application designed primarily for contractors and freelancers to track the time spent on different tasks. http://tastycactus.com/projects/timesheet/f-droid.org/repository/browse/?fdfilter=timesheet&fdid=com.tastycactus.timesheetplay.google.com/store/apps/details?id=com.tastycactus.timesheet 44
  • 45. Java Essentials for AndroidJava Essentials for Android Q& A 45