Droidcon it 2014 best practices to develop for different android device classifications

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Here you can experience the learnings, which the presenter got during development of the ImmobilienScout24 Android application. The presentation doesn't cover Design, UX or Fragments, but it gives an introduction and samples of using different resources, in special layouts. These folders can be used for filtering specific configurations, referencing other resources and using layout aliases. This session aims at people with knowledge of coding for Android.

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Droidcon it 2014 best practices to develop for different android device classifications

  1. 1. www.immobilienscout24.de Best Practices to develop for different Android Device Classifications Droidcon | Turin| 07.02.2014 | Hasan Hosgel
  2. 2. About me +HasanHosgel Twitter: @alosdev Github: alosdev Slideshare: hosgel CO-Organizer @ GDG Android in Berlin & community events developer @ ImmobilienScout24 Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  3. 3. About ImmobilienScout24 Germany’s largest real estate listing company. > 10 Mio. Monthly unique users > 1.5 Mio. real estates > 300 Mio. detail views > 1500 Servers ~ 7.5 Mio. App downloads > 3 Mio. Android > 50% mobile traffic Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  4. 4. Fragmentation Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  5. 5. Fragmentation > 5000 Android Devices Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  6. 6. Here comes The Nightmare Image source: Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel http://www.flickr.com/photos/boogeyman13/4553188509/
  7. 7. Here comes The Nightmare For developers Image source: Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel http://www.flickr.com/photos/boogeyman13/4553188509/
  8. 8. Let’s build the fundament Image source: Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel http://www.flickr.com/photos/hertenberger/1434191066/
  9. 9. Device Classification Images sources: https://play.google.com/store/devices Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  10. 10. Device Classification Images sources: https://play.google.com/store/devices http://www.htc.com/de/ Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  11. 11. Device Classification Images sources: http://www.sony.de/hub/google-tv Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  12. 12. Device Classification Images Sources https://developer.ford.com/ Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  13. 13. Open Automotive Alliance Starting 2014 several companies plan to bring Android platform to the cars. • Audi • GM • Google • Honda • Hyundai • Nvidia http://www.openautoalliance.net/ Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  14. 14. Wearables Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  15. 15. Glass Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  16. 16. Hard Work Ahead Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel Source: http://www.flickr.com/photos/16210667@N02/9172895225
  17. 17. Resource Folders You can use several qualifiers in the resource folders name for serving the best matching resource. Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  18. 18. Qualifiers ● Language (-en) ● Language & Region (-en-rUS) ● Smallest Width (–sw600dp) ● Screensize (-small, -normal, -large) ● Screen Orientation (-port, -land) ● Screen Pixel Densitiy (-hdpi, -xhdpi, -xxhdpi) ● Platform Version (-v11, -v13) Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  19. 19. Best Matching Resources Win 1.res/values/strings.xml 2.res/values-en-rUS/strings.xml 3.res/values-large/strings.xml 4.res/values-sw600dp/strings.xml Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  20. 20. Best Matching Resources Win 1.res/values/strings.xml 2.res/values-en-rUS/strings.xml 3.res/values-large/strings.xml 4.res/values-sw600dp/strings.xml The order of the qualifiers in the previous slides gives the ranking, if two resources have the same matching number of qualifiers. Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  21. 21. Images Resources • Use the different qualifiers for the screen pixel density (mdpi, hdpi, etc.) • If you are forced to use text on images use language and region (en, es-rUS, en-rUS, etc.) • Better approach is to use 9-patch drawables, which stretches automatically depending on the content inside. • You must provide different launcher icons for Froyo, Honeycomb and above? Use the platform version. (v4, v11, v14) Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  22. 22. Classifications for Layouts Platform version at least v13 (Honeycomb MR2) Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  23. 23. Classifications for Layouts Platform version at least v13 (Honeycomb MR2) project-folder/res/ layout/ Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  24. 24. Classifications for Layouts Platform version at least v13 (Honeycomb MR2) project-folder/res/ layout/  small phones Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  25. 25. Classifications for Layouts Platform version at least v13 (Honeycomb MR2) project-folder/res/ layout/  small phones layout-sw320dp/  other phones Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  26. 26. Classifications for Layouts Platform version at least v13 (Honeycomb MR2) project-folder/res/ layout/  small phones layout-sw320dp/  other phones layout-sw600dp/  tablets 7” Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  27. 27. Classifications for Layouts Platform version at least v13 (Honeycomb MR2) project-folder/res/ layout/  small phones layout-sw320dp/  other phones layout-sw600dp/  tablets 7” layout-sw720dp/  tablets 10” * You should also use the orientation qualifier Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  28. 28. Platform version at lower v11 project-folder/res/ layout/  phones layout-sw320dp/  other phones layout-sw600dp/  tablets 7” layout-sw720dp/  tablets 10” Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  29. 29. Platform version at lower v11 project-folder/res/ layout/  phones layout-v11/  tablets 10” layout-sw320dp/  other phones layout-sw600dp/  tablets 7” layout-sw720dp/  tablets 10” Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  30. 30. Platform version at lower v11 project-folder/res/ layout/  phones layout-v11/  tablets 10” layout-v13/  small phones layout-sw320dp/  other phones layout-sw600dp/  tablets 7” layout-sw720dp/  tablets 10” Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  31. 31. Hint The smallest width qualifier gets automatically platform version ”-v13” through the packager, for avoiding problems with the number of matching qualifiers. Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  32. 32. Howto Classify In Code • Read configuration from the device Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  33. 33. Howto Classify In Code • Read configuration from the device • Smarter approach is to use boolean resources Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  34. 34. project-folder/res/values/layouts.xml <resources> </resources> Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  35. 35. project-folder/res/values/layouts.xml <resources> <bool > </bool> </resources> Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  36. 36. project-folder/res/values/layouts.xml <resources> <bool name="is_phone_small"> </bool> </resources> Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  37. 37. project-folder/res/values/layouts.xml <resources> <bool name="is_phone_small">true</bool> </resources> Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  38. 38. project-folder/res/values/layouts.xml <resources> <bool name="is_phone_small">true</bool> <bool name="is_phone_other">false</bool> <bool name="is_tablet_7">false</bool> <bool name="is_tablet_10">false</bool> </resources> Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  39. 39. project-folder/res/values/layouts.xml <resources> <bool name="is_phone_small">true</bool> <bool name="is_phone_other">false</bool> <bool name="is_tablet_7">false</bool> <bool name="is_tablet_10">false</bool> </resources> Usage in code: getResources().getBoolean(R.bool.is_phone_small) Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  40. 40. Current Layout File Structure project-folder/res/ layout/main.xml layout-v11/main.xml layout-v13/main.xml layout-sw320dp/main.xml layout-sw600dp/main.xml layout-sw720dp/main.xml Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  41. 41. Current Layout File Structure project-folder/res/ layout/main.xml layout-v11/main.xml layout-v13/main.xml layout-sw320dp/main.xml layout-sw600dp/main.xml layout-sw720dp/main.xml Fixing one bug in the 10“ layout has to be done in two files. Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  42. 42. Current Layout File Structure project-folder/res/ layout/main.xml layout-v11/main.xml layout-v13/main.xml layout-sw320dp/main.xml layout-sw600dp/main.xml layout-sw720dp/main.xml Fixing one bug in the 10“ layout has to be done in two files.  error prone Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  43. 43. Resource Alias Put your layout files in the default folder. project-folder/res/ layout/main_phone_small.xml layout/main_phone_other.xml layout/main_tablet_7.xml layout/main_tablet_10.xml Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  44. 44. Resource Alias 2. Create an item with the needed classification in the previously defined values folder. project-folder/res/valuessw720dp/layouts.xml <resources> </resources> Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  45. 45. Resource Alias 2. Create an item with the needed classification in the previously defined values folder. project-folder/res/valuessw720dp/layouts.xml <resources> <item > </item> </resources> Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  46. 46. Resource Alias 2. Create an item with the needed classification in the previously defined values folder. project-folder/res/valuessw720dp/layouts.xml <resources> <item name="main" > </item> </resources> Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  47. 47. Resource Alias 2. Create an item with the needed classification in the previously defined values folder. project-folder/res/valuessw720dp/layouts.xml <resources> <item name="main" type="layout"> </item> </resources> Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  48. 48. Resource Alias 2. Create an item with the needed classification in the previously defined values folder. project-folder/res/valuessw720dp/layouts.xml <resources> <item name="main" type="layout"> @layout/main_tablet_10.xml</item> </resources> Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  49. 49. Sample Screen Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  50. 50. Sample Screen Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  51. 51. Sample Screen Use <includes> Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  52. 52. Usage Includes <LinearLayout … > … … </LinearLayout> Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  53. 53. Usage Includes <LinearLayout … > … <include … </LinearLayout> /> Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  54. 54. Usage Includes <LinearLayout … > … <include layout="@layout/footer"/> … </LinearLayout> Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  55. 55. Sample Screen Use <includes> Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  56. 56. Sample Screen Use <includes> Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  57. 57. Sample Screen Create custom view Use <includes> Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  58. 58. Custom View public class CustomView extends LinearLayout { … public CustomView(Context context, AttributeSet attrs) { … addView(createTextView(context, "label"), lp); addView(createTextView(context, "desc"), lp); if(getResources().getBoolean(R.bool.is_phone)){ setOrientation(VERTICAL); } else { setOrientation(HORIZONTAL); } } … } Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  59. 59. Usage CustomView in layout file <LinearLayout … > … … </LinearLayout> Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  60. 60. Usage CustomView in layout file <LinearLayout … > … <de.alosdev.CustomView android:layout_width="wrap_content" android:layout_height="wrap_content"/> … </LinearLayout> Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  61. 61. Sample Screen Create custom view Use <includes> Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  62. 62. Custom XML Attribute <resources> <declare-styleable > </declare-styleable> <resources> Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  63. 63. Custom XML Attribute <resources> <declare-styleable name=”CustomView"> </declare-styleable> <resources> Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  64. 64. Custom XML Attribute <resources> <declare-styleable name=”CustomView"> <attr </declare-styleable> <resources> Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel />
  65. 65. Custom XML Attribute <resources> <declare-styleable name=”CustomView"> <attr name="label" </declare-styleable> <resources> Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel />
  66. 66. Custom XML Attribute <resources> <declare-styleable name=”CustomView"> <attr name="label" format="reference|string"/> </declare-styleable> <resources> Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  67. 67. Custom XML Attribute <resources> <declare-styleable name=”CustomView"> <attr name="label" format="reference|string"/> <attr name="value" format="reference|string"/> <attr name="orientation" format="enum"> <enum name="horizontal" value="0"/> <enum name="vertical" value="1"/> </attr> </declare-styleable> <resources> Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  68. 68. Usage in layout resource 1. Add to root XML node xmlns:app="http://schemas.android.com/apk/resauto" 2. Usage in custom view <de.alosdev.CustomView android:id="@+id/customView" android:layout_width="wrap_content" android:layout_height="wrap_content" app:label="label 1" app:orientation="vertical" app:value="value 1" /> Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  69. 69. Usage in code public class CustomView extends LinearLayout { static final int[] ORIENTATION = new int[] { HORIZONTAL, VERTICAL }; public CustomView(Context context, AttributeSet attrs) { super(context, attrs); … TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CustomView); try { setOrientation(ORIENTATION[ a.getInt(R.styleable.CustomView_orientation, 0)]); } finally { a.recycle(); } } … } Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  70. 70. Custom XML Attribute Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  71. 71. Custom XML Attribute If custom view has much more business logic and need lifecycles  Create a Fragment Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  72. 72. Code Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  73. 73. Best Practices ● You have already an application Remove orientation fixation and suppressing of orientation change from manifest to avoid long bug analyzing. ● You start from the scratch Focus on main classification for faster time to market But create an overall concept for better modularization Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  74. 74. Best Practices ● If you support both orientations, save the instance state while orientation changes for more responsiveness Especially for states, that need a long computation for creation. Make the state object Parcelable for faster write & read and also to have a smaller memory footprint Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  75. 75. Developer Hints ● You can start an activity for result from a fragment, so the response can be handled in the fragment. ● If you want to register a special service on every onCreate method of an activity give the ActivityLivecycleCallbacks a try. You can register them in the onCreate method of the application. (minSDK -v14) Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  76. 76. ● If you get a BadParcelableException with the cause ClassNotFound-Exception, the source can be a NullPointerException during the read or write of the Parcelable. Exceptions are hidden during the parcel process. Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  77. 77. If you want to use “match_parent” or “wrap_content” in a dimension alias, you should use “-1dp” or “-2dp” project-folder/res/values/dimen.xml <resources> <dimen name="my_dimen>@dimen/match_parent</dimen> <dimen name="match_parent">-1dp</dimen> <dimen name="wrap_content">-2dp</dimen> </resources> project-folder/res/values-sw600dp/layout.xml <resources> <dimen name="my_dimen>300dp</dimen> </resources> Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  78. 78. Listener Hell If you have to many listeners or you think the programming model is old school like the “goto statements”. Give message/ event/ service bus a try. For Android: Otto from Square EventBus from greenrobot See also: Callbacks as our Generations' Go To Statement Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  79. 79. Custom Theme & Style Android Ui Utils Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  80. 80. ActionBar Style Generator Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  81. 81. Holo Color Generator Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  82. 82. Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel
  83. 83. Mission Accomplished ? Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel http://www.flickr.com/photos/ianaberle/5729561934/
  84. 84. Mission Accomplished Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel http://www.flickr.com/photos/ianaberle/5729561934/
  85. 85. Q&A Page 85 Droidcon IT 2014 | Develop for different device classifications | Hasan Hosgel Source: http://www.flickr.com/photos/21496790@N06/5065834411/
  86. 86. www.immobilienscout24.de Thanks for your attention! Contact: +HasanHosgel Twitter: @alosdev Github: alosdev Best Practices to develop for different Android Device Classifications https://github.com/alosdev/multidevice-nightmare-demo http://www.slideshare.net/hosgel/droidcon-it-2014-best-practices-to-develop-fordifferent-android-device-classifications

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