Diving into Android App Bundles

Have you ever been concerned about your app size being unnecessarily large? Or you feel guilty that you ship features that are not useful to over 50% of your users? Android App Bundles is here to help you deliver better apps while still making your code base nicer. I will like to talk to you about it.

Transcript

1. Diving Into Android App
   Bundles
   DROIDCON KENYA
   2019
   AUGUST 8TH-9TH, 2019
   

   View Slide

2. DROIDCON KENYA
   2019 AUGUST 8TH-9TH, 2019
   @_larikraun
   Omolara Adejuwon
   Android Engineer at Kudi Inc.
   

   View Slide

3. Storage Space
   Many phones have storage less than 1GB
   available space
   Your app + Photos +Videos + Chats + Other
   apps =
   

   View Slide

4. Time
   Large Apps
   Slower downloads
   Frustrated Users
   

   View Slide

5. Cost
   Many users live on capped data.
   The larger the app, the less willing people
   are to download
   

   View Slide

6. Key Insights
   1%
   3MB
   =
   

   View Slide

7. ANALYZING APK
   classes.dex
   classes2.dex
   assets/
   res/
   AndroidManifest.xml
   

   View Slide

8. Screen density
   xxxhdpi xxhdpi xhdpi
   hdpi mdpi ldpi
   Architecture
   arm64 x86 arm
   x86_64
   Locale
   en xh db
   ja ... ...
   

   View Slide

9. Android App Bundles
   

   View Slide

10. Replaces the traditional monolithic apk
    

    View Slide

11. Single artifact with all of your app's code and
    resources
    

    View Slide

12. Play generates the apk optimized for specific devices.
    Therefore, AABs are not installable directly.
    

    View Slide

13. 20%
    average size saving vs
    universal APK
    11%
    increase in installs due
    to size savings
    

    View Slide

14. 7.2%
    saved in App Size
    At Kudi
    

    View Slide

15. ANALYZING AAB
    base/
    dex/
    classes.dex
    classes2.dex
    assets/
    res/
    manifest/
    AndroidManifest.xml
    

    View Slide

16. Dynamic Feature
    Modules
    

    View Slide

17. View Slide

18. View Slide

19. View Slide

20. AndroidManifest.xml
    

    View Slide

21. droidconke/
    dex/
    classes.dex
    assets/
    res/
    manifest/
    AndroidManifest.xml
    base/
    dex/
    classes.dex
    classes2.dex
    assets/
    res/
    manifest/
    AndroidManifest.xml
    Base Module
    Dynamic Feature Module -
    droidconke
    

    View Slide

22. Dynamic Delivery
    

    View Slide

23. The smaller APKs are achieved by delivering only the
    resources the specific devices need.
    

    View Slide

24. It works with Split APKs as the underlying principle
    

    View Slide

25. Split APKs
    Base APK: contains all common code and resources
    Configuration APKs: contains resources based on device’s
    config i.e locale, architecture, screen density
    Dynamic Feature APKs: contains codes that can be
    downloaded at a later time. This will be discussed later in
    the presentation.
    - Introduced in Lollipop
    

    View Slide

26. Screen density
    xxxhdpi xxhdpi xhdpi hdpi
    mdpi ldpi
    Architecture
    arm64 x86 arm x86_64
    Locale
    en xh db ja
    fr ...
    

    View Slide

27. Screen density
    xxhdpi xhdpi hdpi
    mdpi ldpi
    Architecture
    arm64 x86 arm x86_64
    Locale
    en xh db ja
    fr ...
    xxxhdpi
    

    View Slide

28. Screen density
    xxhdpi xhdpi hdpi
    mdpi ldpi
    Architecture
    x86 arm x86_64
    Locale
    en xh db ja
    fr ...
    arm64
    xxxhdpi
    

    View Slide

29. Screen density
    xxhdpi xhdpi hdpi
    mdpi ldpi
    Architecture
    x86 arm x86_64
    Locale
    xh db ja
    ...
    fr
    arm64
    xxxhdpi
    

    View Slide

30. In-App Updates
    

    View Slide

31. Play Core library feature that introduces a new request flow to
    prompt active users to update your app
    

    View Slide

32. Works only with devices running Android 5.0 (API level 21) or
    higher,
    

    View Slide

33. A user experience that provides background download and
    installation with graceful state monitoring.
    This UX is appropriate when it’s acceptable for the user to use
    the app while downloading the update.
    Flexible In-App Updates
    

    View Slide

34. View Slide

35. A full screen user experience that requires the user to update
    and restart the app in order to continue using the app.
    Immediate In-App Updates
    

    View Slide

36. This UX is best for cases where an update is critical for
    continued use of the app.
    After a user accepts an immediate update, Google Play handles
    the update installation and app restart.
    Immediate In-App Updates
    

    View Slide

37. View Slide

38. View Slide

39. Is update available?
    

    View Slide

40. Start the update
    

    View Slide

41. Start the update
    

    View Slide

42. For flexible updates, you need to handle the app installation
    yourself after the download is complete.
    Flexible Vs. Immediate In-App Updates
    For immediate updates, play handles the download and
    installation for you.
    

    View Slide

43. Install the downloaded updated
    

    View Slide

44. Conditional Delivery
    

    View Slide

45. Let's you control which part of your app is served to which users
    

    View Slide

46. You can specify conditions under which a feature would be
    delivered as part of the app installation or otherwise left out.
    

    View Slide

47. Types of Conditions
    Country
    MinSdk Version
    Device Feature
    

    View Slide

48. View Slide

49. On-Demand Delivery
    

    View Slide

50. Let's you install and uninstall specific features in on-demand
    

    View Slide

51. View Slide

52. AndroidManifest.xml
    

    View Slide

53. View Slide

54. View Slide

55. View Slide

56. To be able to maximize all the cool features of Android App
    Bundles as explained so far, your app needs to be well
    modularized.
    Moyinoluwa Adeyemi just delivered a great talk on App
    Modularization: From Zero to Hero
    

    View Slide

57. Testing Android App
    Bundles
    

    View Slide

58. Unlike APKs, AABs are not installable directly because
    play generates the apk optimized for specific devices
    

    View Slide

59. Internal App Sharing
    

    View Slide

60. Internal App Sharing gives you a quick and easy way
    to share Android App Bundle and Apk Internally
    

    View Slide

61. It lets you upload app bundle or APK and share the link
    with your team.
    

    View Slide

62. No signed APK or App bundle is required for Internal app sharing.
    

    View Slide

63. No Unique Version code enforcement. So multiple APK or App
    bundles can be upload independently, to the play console.
    

    View Slide

64. You can also debug the APK or App bundles once they’re
    installed to the tester’s device by uploading Debuggable
    artifacts.
    

    View Slide

65. There are APIs available for Internal App sharing so you can
    automate some of the processes
    

    View Slide

66. View Slide

67. Image Credit: https://medium.com/mindorks/internal-app-sharing-in-android-f80c7751bf37
    

    View Slide

68. A Challenge we faced at Kudi
    

    View Slide

69. View Slide

70. View Slide

71. https://developer.android.com/studio/projects/dynamic-delivery
    https://developer.android.com/studio/command-line/bundletool
    https://events.google.com/io/schedule/?section=may-8&sid=b9eabde0-be05-
    492c-bf9e-c3f772f1db7e
    https://codelabs.developers.google.com/codelabs/your-first-dynamic-
    app/index.html
    Useful Links
    

    View Slide

72. Thank you for listening
    @_larikraun
    Omolara Adejuwon
    

    View Slide