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Google Developer Group(GDG) DevFest Event 2012 Android talk


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This presentation is Imam Raza's tech talk on "Android" in Google Developer Group DevFest 2012 Event. In the event Mr. Imam Raza condemned recent blasphemy act of Google of not removing blasphemy video by saying "Shame on You". He also appreciated the efforts of minorities who stand with Muslim community on this issue.
He also read following Stanza from Allama Iqbal poem "Jawaab-e-Shikwa", in which Allah is answering to complains of Muslims to Him. In below stanza Allah is praising His prophet Mohammad (peace be upon him) and telling that this universe is made due His beloved prophet Mohammad (peace be upon him). In last part of stanza Allah tells Muslims that if they want to success in this world and there after then they have to make themselves loyal to Mohammad (peace be upon him).

ہو نہ یہ پھول تو بلبل کا ترنم بھی نہ ہو
چمن دہر میں کلیوں کا تبسم بھی نہ ہو

یہ نہ ساقی ہو تو پھر مے بھی نہ ہو،خم بھی نہ ہو
بزم توحید بھی دنیا میں نہ ہو، تم بھی نہ ہو

خیمہ افلاک کا استادة اسی نام سے ہے
نبض ہستی تپش امادة اسی نام سے ہے

دشت میں، دامن کہسارمیں،میدان میں ہے
بحر میں، موج کی ا غوش میں،طوفان میں ہے

چین کے شہر، مراقش کے بیابان میں ہے
اور پوشیدة مسلمان کے ایمان میں ہے

چشم اقوام یہ نظارة ابد تک دیکھے
رفعت شان رفعنالک ذکرک دیکھے

کی محمد سے وفا تو نے تو ہم تیرے ہیں
یہ جہاں چیز ہے کیا، لوح و قلم تیرے ہیں

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Google Developer Group(GDG) DevFest Event 2012 Android talk

  1. 1. Android Application Development DevFest event 2012 @Pear Continental, Karachi Presenter: Imam Raza
  2. 2.• Senior Software Architect @ Folio3.• Specialties: Enterprise Software Architecture, Mobile Software Architecture, Software Best Practices(TDD,CI ,AOP, IOC).• Master in computer science from KU• B.E (Mechanical) from NED UniversityMonday, September 19, 2011
  3. 3. Me.loveQuestions==trueMonday, September 19, 2011
  4. 4. Monday, September 19, 2011
  5. 5. Agenda• Market Statistics• The Android Work in Pakistan• Android Basics• Hello World• Main Building Blocks• Android Best Practices
  6. 6. Agenda• Market Statistics• The Android Work in Pakistan• Android Basics• Hello World• Main Building Blocks• Android Best Practices
  7. 7. SmartPhone Vs PC sales 2011Category Q4 2011 Growth Full year 2011 Growth shipments Q4’11/Q4’10 shipments 2011/2010 (millions) (millions)Smart Phones 158.5 56.6% 487.7 62.7%Total Client Pcs 120.2 16.3% 414.6 14.8%-pads 26.5 186.2% 63.2 274.2%-netbooks 6.7 -32.4% 29.4 -25.3%-notebooks 57.9 7.3% 209.6 7.5%-Desktops 29.1 -3.6% 112.4 2.3%
  8. 8. Market Share Q2 2012Smart Phone %percentage Unit sold (millions)Android 68.1% 104.8iOS 16.9% 26Black Berry 4.8% 7.4Symbian 4.4% 6.8Windows 3.5% 5.4
  9. 9. AgendaMarket StatisticsThe Android Work in PakistanAndroid BasicsHello WorldMain Building BlocksAndroid Best Practices
  10. 10. Android Apps• Myomo MyProgress• Sony Socom Android App• Bitzer• NSDroid (NetSuite CRM)• Hiplink
  11. 11. Myomo
  12. 12. Sony Socom App
  13. 13. BEAM(Bitzer Enterprise)
  14. 14. NSDroid(NetSuite CRM)
  15. 15. Hiplink
  16. 16. AgendaMarket StatisticsThe Android Work in PakistanAndroid BasicsHello WorldMain Building BlocksAndroid Best Practices
  17. 17. Android Stack
  18. 18. The Stack
  19. 19. Linux Kernel• Android runs on Linux. Linux provides: – Hardware abstraction layer – Memory management – Process management – Networking• Users never see Linux sub system• The adb shell command opens Linux shell
  20. 20. Native Libraries• Pieces borrowed from other open source projects: – Bionic, a super fast and small license-friendly libc library optimized for Android• WebKit library for fast HTML rendering• OpenGL for graphics• Media codecs offer support for major audio/video codecs• SQLite database ..Much more…
  21. 21. Question: Difference betweenJava VM and Dalvik VM?
  22. 22. Dalvik VM• Dalvik VM is Android implementation of Java VM• Dalvik is optimized for mobile devices: –  Battery consumption –  CPU capabilities• Key Dalvik differences: – Register-based versus stack-based VM – Dalvik runs .dex files – More efficient and compact implementation – Different set of Java libraries than JDK
  23. 23. Application Framework• The rich set of system services wrapped in an intuitive Java API.• This ecosystem that developers can easily tap into is what makes writing apps for Android easy.• Location, web, telephony, WiFi, Bluetooth, notifications, media, camera, just to name a few.
  24. 24. Applications
  25. 25. Applications• Dalvik Executable + Resources = APK• Must be signed (but debug key is okayfor development)• Many markets with different policies
  26. 26. Question: What is thedifference between Androidand Java?
  27. 27. Android and JavaAndroid Java=Java SE–AWT/Swing+Android API
  28. 28. Android SDK- what is in box?SDKToolsDocsPlatforms – Data – Skins – Images – SamplesAdd-ons – Google
  29. 29. AgendaMarket StatisticsThe Android Work in PakistanAndroid BasicsHello WorldMain Building BlocksAndroid Best Practices
  30. 30. Hello World-Create NewProjectUse the Eclipse tool to create a new Android project.Here are some key constructs:
  31. 31. Step-1
  32. 32. Step-2
  33. 33. Step-3
  34. 34. Step-4
  35. 35. Hello World-Anatomy of AppJava Code+XML / OtherResources+Manifest File=Android App
  36. 36. HelloWorld-Manifest File<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="" package="com.folio3" android:versionCode="1" android:versionName="1.0"> <uses-sdk android:minSdkVersion="10" /> <application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name=".HelloworldActivity" 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></manifest>
  37. 37. HelloWorld- Layout ResourceFile<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" ><TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" /></LinearLayout>
  38. 38. HelloWorld-JAVA Filepackage com.folio3;import;import android.os.Bundle;public class HelloAndroid extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); }}
  39. 39. AgendaMarket StatisticsThe Android Work in PakistanAndroid BasicsHello WorldMain Building BlocksAndroid Best Practices
  40. 40. Main Building Blocks• Activities• Intents• Services• Content Providers• Broadcast Receivers• Fragments
  41. 41. ActivitiesAn activity represents a screenor windows
  42. 42. Activity LifeCycleActivity have well-definedlifecycle. The android OSmanages your activity bychanging its state.You fill in the blanks
  43. 43. Intents• Intents represent events or actions.• They are to Android apps what hyperlinks are to websites. Sort of.• Intents can beimplicit or explicit.
  44. 44. ServicesServices are code that runs in the background. They can be started and stopped. Services doesn’t have UI.
  45. 45. Service LifeCycle• Service also has a lifecycle, but it’s much simpler than activity’s.• An activity typically starts and stops a service to do some work for it in the background, such as play music, check for new tweets, etc.
  46. 46. Content Provider• Content Providers sharecontent with applicationsacross applicationboundaries.• Examples of built-inContent Providers are: – Contacts, – MediaStore, – Settings and more.
  47. 47. Broadcast ReceiversAn Intent-based publish-subscribe mechanism. Great for listening system events such as SMS messages.
  48. 48. FragmentsA Fragment represents a behavior or a portion ofuser interface in an Activity.
  49. 49. Fragments• Fragments were introduced in Android 3.0 (API level 11), primarily to support more dynamic and flexible UI designs on large screens, such as tablets.• Fragments are lot like an activity but it must exists within the activity.• DialogFragment makes it easy to show a Dialog that is managed as part of the Activity lifecycle.• ListFragment makes it easy to show a list of data.Monday, September 19, 2011
  50. 50. Monday, September 19, 2011
  51. 51. AgendaMarket StatisticsThe Android Work in PakistanAndroid BasicsHello WorldMain Building BlocksAndroid Best Practices
  52. 52. Best Practices• Use RoboGuice(DI based framework)• Learn Activity Life Cycle• Avoid getting activities thick• Design views for multiple size/orientation.• Use Fragments to better manage sub-portion of Activity.• Practice Good MVC.• Use Source Code Analyzer Tools (findbugs, checkstyle,PMD and CPD). Integrate these tools with CI Tools like Teamcity.Monday, September 19, 2011
  53. 53. RoboGuice• It’s based on dependency injection pattern just like Spring Framework in enterprise apps• It takes the guesswork out of development. e.g checking null for getIntent().getExtras(). Casting findViewById().• Make your writing unit test case easy• It reduces your lines of code and hence the number of bugs see next slide for code.Monday, September 19, 2011
  54. 54. class AndroidWay extends Activity { TextView name; ImageView thumbnail; LocationManager loc; Drawable icon; String myName; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); name = (TextView) findViewById(; thumbnail = (ImageView) findViewById(; loc = (LocationManager) getSystemService(Activity.LOCATION_SERVICE); icon = getResources().getDrawable(R.drawable.icon); myName = getString(R.string.app_name); name.setText( "Hello, " + myName ); } }Monday, September 19, 2011
  55. 55. class RoboWay extends RoboActivity { @InjectView( TextView name; @InjectView( ImageView thumbnail; @InjectResource(R.drawable.icon) Drawable icon; @InjectResource(R.string.app_name) String myName; @Inject LocationManager loc; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); name.setText( "Hello, " + myName ); } }Monday, September 19, 2011
  56. 56. Compatibility• Ability to install and run app on device.• Huge variety of devices so developer need to make sure about the Hardware/Software feature his application needed to run.Monday, September 19, 2011
  57. 57. Compatibility• Specify uses-feature node for every API you use• Mark essential features as required.• Mark optional features as not required.<uses-featureAndroid:name=“android.hardware.gps”Android:required=“true”/>Monday, September 19, 2011
  58. 58. Compatibility• Check for API existence in code.PackageManager pm = getPackageManager();Boolean hasCompass= pm.hasSystemFeature(PackageManager.FEATURE_SENSOR_COMPASS);If(hasCompass){//enable things are needed}Monday, September 19, 2011
  59. 59. CompatibilityUse dp and sp instead of px:<Button android:layout_width=“wrap_content” Android:layout_height=“wrap_content” Android:layout_marginTop=“20dp”/><TextView android:layout_width=“match_parent” Android:layout_height=“wrap_content” Android:textsize=“20sp”/>Monday, September 19, 2011
  60. 60. CompatibilityMonday, September 19, 2011
  61. 61. Compatibility-Test for differentdevice/screen size Monday, September 19, 2011
  62. 62. Compatibility-Test for differentdevice/screen size Monday, September 19, 2011
  63. 63. Advance Task Killer App is among 50 millions or more install apps Why?Monday, September 19, 2011
  64. 64. Performance• Avoid creating objects. (e.g use StringBuffer) .• Prefer static over virtual.• Use static final for constants.• Avoid internal getter/Setter (with Proguard you don’t need it.)• Use Enhanced For Loop Syntax e.g: for (Foo a : mArray) { sum += a.mSplat; }• Use native methods.• Avoid using Float and enums
  65. 65. ResponsivenessMonday, September 19, 2011
  66. 66. Responsiveness• “Application Not Responding” • Respond to user within 5 seconds • Broadcast Receiver must complete within 10 seconds• Use Threads and AsyncTasks within ServicesMonday, September 19, 2011
  67. 67. Source Code Analyzer Tools• FindBugs• PMD• CheckStyle• CPD : Shows code duplication• You can integrate them with CI Server like Teamcity to get consolidated reports of code quality of your team. We have been using it on our company and its really helped us in monitoring quality of code.Monday, September 19, 2011
  68. 68. Monday, September 19, 2011
  69. 69. Questions