android Instant app introduction

1. Instant App Intro

2. About Me
•https://github.com/Jintin
•Developer @ Carousell

3. Fun projects
• Swimat - https://github.com/Jintin/Swimat
• andle - https://github.com/Jintin/andle
• transai - https://github.com/Jintin/transai
• IMZh - https://github.com/Jintin/IMZh

4. Instant App

5. Why Instant App

6. Web is eating the world

7. App vs Web
• Url-base
• Find-ability
• Share-ability
• Upgradability
• Compatibility

8. Apps downloads / month

9. Google Play Evolution
?

10. Use App as Web ?

11. Instant App

12. What is Instant App ?

13. Instantly
without Installation
Use and forget

14. Usage

15. Instant App
• No need to Install
• Url-base
• Not trail version of Installation App

16. To Do or Not to Do
• Think use case first
• Role between App and Web
• Android 6.0 only (currently)
• Some Limitation

17. Developer story

18. Requirement
• App Link
• Https connection only
• Android SDK 6.0
• Runtime permission if need
• Android studio 3.0
• Size Limit 4MB per bundle
• Code Signing v2

19. App Link
• Add intent-filter to your activity to handle url
• add assetlinks.json in your website .well-
known/ folder to certificate with SSL enable

20. Intent filter
<intent-filter>
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.DEFAULT" />
<category android:name="android.intent.category.BROWSABLE" />
<data
android:scheme="http"
android:host="www.xxx.com" />
<data
android:scheme="https"
android:host=“www.xxx.com" />
</intent-filter>

21. Assetlinks.json
[{
"relation": ["delegate_permission/common.handle_all_urls"],
"target": {
"namespace": "android_app",
"package_name": “com.xxx.xxx”,
"sha256_cert_fingerprints":
[“F9:9B:EA:10:2C:44:C5:A9:4C:BD:DF:4A:E8:BC:B2:28:CC:D7:1B:9F:DD:00:
72:76:F2:E5:FD:15:37:B1:2F:5E"]
}
}]

22. Available Permission
• BILLING
• ACCESS_COARSE_LOCATION
• ACCESS_FINE_LOCATION
• ACCESS_NETWORK_STATE
• CAMERA
• INSTANT_APP_FOREGROUND_SERVICE (O only)
• INTERNET
• READ_PHONE_NUMBERS only in Android (O only)
• RECORD_AUDIO
• VIBRATE

23. Android Studio 3
• Google Maven Repository
• Gradle plugin 3.0+
• New Implementation & Api dependency
• Old Compile convert to Api

24. Implementation vs Api
// dependencies {
// compile 'com.google.dagger:dagger:2.7'
// }
dependencies {
implementation 'com.google.dagger:dagger:2.7'
}
dependencies {
api 'com.google.dagger:dagger:2.7'
}

25. Implementation vs Api

26. 4MB Limit
• Count per bundle (feature + base)
• Can has multi bundle

27. Avoid 4MB Limit
• Proguard
• Avoid Library
• Use Drawable
• Use Vector image
• Use WebP image

28. Code Sign V2
• Fast
• Safe
• Compatibility

29. Code Sign V2

30. Structure

31. App Instant
Structure
Base
Feature

32. Instant app module
• New plugin type
• Wrapper of the detail feature

33. Structure
App Instant
Base
Feature

34. Feature module
• New plugin type
• Generate lib in app build process
• Generate apk in instant app build

35. Base Feature
• Only one
• Contain common resource, lib … etc
• Defined by `baseFeature true` in build.gradle
• Bind with other feature & app (bi-direction)

36. How to…

37. First Refactoring
• Remove unused code
• Modularize
• Proguard
• Avoid Library ?!

38. • Nexus 5X, Nexus 6P, Pixel, Pixel XL,
Galaxy S7 running Android 6.0 or higher.
• Nexus 5X (Nexus 6P) image running
Android 6.0 (API level 23), x86, with
Google APIs
Setup Device

39. Setup Device (before O)

40. install instant SDK

41. The easiest way

42. Wizard

43. One click enable

44. Done ?

45. Q1: Existing project ?

46. Q2: How to solve …

47. Start from the beginning

48. App
Original

49. App
Split Code
Feature

50. App Instant
Create Instant app
Feature

51. App
Feature
Instant
Base
Create Base Feature

52. Create Multi Feature
App
Feature
Instant
Base
Feature2

53. Create Multi Feature
App
Feature
Instant
Base
Feature2 Feature3

54. Steps(single feature)
• Put code into feature module
• Add app module wrapper
• Add instant app module wrapper
• Link reference together

55. Steps(with base feature)
• Split feature into feature and base
• Move the `baseFeature true` flag to base
• Link reference together

56. Steps(with multi feature)
• Link baseFeature together
• Connect other module by URL
• Check the resource is not conflict
• Check if the zip file has multi-apk

57. Work with different
• compile ‘com.google.android.instantapps:instantapps:1.0.0’
• func App.isInstantApp(Context context)
• func showInstallPrompt(Activity activity, int
requestCode, String referrer)

58. Demo

59. Distribution

60. Play Console

61. Relevant Links
• Documentation:
g.co/InstantApps
• For technical questions:
https://stackoverflow.com/questions/tagged/android-
instant-apps
• Reporting Studio/tools bugs:
https://developer.android.com/studio/report-bugs.html

62. Q&A

63. • https://developer.android.com/topic/instant-apps
• https://medium.com/vimeo-engineering-blog/vimeo-android-instant-
apps-2f8b1e94760c
• https://play.google.com/about/other-programs/android-instant-apps/
• https://developer.android.com/topic/performance/reduce-apk-size.html
• https://jeroenmols.com/blog/2017/06/14/androidstudio3/
• https://source.android.com/security/apksigning/v2
• http://www.androidauthority.com/use-android-instant-apps-749544/
• https://developer.android.com/stories/instant-apps.html