Introduction to Android Instant Apps

Android Instant Apps are the new kid in the large town of Android-city. The promise behind it is quite simple and groundbreaking at the same time: running native Android apps instantly on your device, without installation.

In this session we will first introduce this evolution in app sharing and discovery mostly from a user perspective. Secondly, we will discover how, as a developer, you can build an Android Instant Apps and deliver this new experience frictionless to all of your users.

Transcript

1. Introduction to Android Instant Apps by Cyril Mottier
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6. Find Install Start Setup Use Installing & using a mobile app is a long and steep path
7. Reduce friction as much as possible
8. Instant apps Native apps, without installation
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12. You may only need 10% of an app’s features So why download 100%?
13. Application
14. Application Feature 1 Feature 2 Feature 3 Common
15. The build output now depends on the targeted run mode
16. installable.apk Feature 1 Feature 2 Feature 3 Common
17. instant_app.zip Feature 1 APK Feature 2 APK Feature 3 APK Base APK
18. What about the on-device behaviour?
19. Installable app
20. Feature 1 Feature 2 Feature 3 Base Installable app
21. Instant app
22. Feature 1 Base Instant app Using feature 1
23. Feature 2 Base Instant app Using feature 2
24. Feature 1 Base Instant app Using feature 1 then 2
25. Feature 1 Feature 2 Base Instant app Using feature 1 then 2
26. Feature 1 Feature 2 Feature 3 Base Instant app Using all features
27. Lollipop+
28. Android Studio 3.0+ with Instant Apps Development SDK
29. Runtime permissions introduced in Android 6.0 (API level 23)
30. App links Associate your app with your domain
31. <intent-filter android:autoVerify="true"> <category android:name="android.intent.category.BROWSABLE" /> <category android:name="android.intent.category.DEFAULT" /> <action android:name="android.intent.action.VIEW" /> <data android:scheme="http" /> <data android:scheme="https" /> <data android:host="${host}" android:path="/licenses" /> </intent-filter> android:autoVerify="true"
32. <intent-filter android:autoVerify="true"> <category android:name="android.intent.category.BROWSABLE" /> <category android:name="android.intent.category.DEFAULT" /> <action android:name="android.intent.action.VIEW" /> <data android:scheme="http" /> <data android:scheme="https" /> <data android:host="${host}" android:path="/licenses" /> </intent-filter> android:autoVerify="true"
33. <intent-filter android:autoVerify="true"> <category android:name="android.intent.category.BROWSABLE" /> <category android:name="android.intent.category.DEFAULT" /> <action android:name="android.intent.action.VIEW" /> <data android:scheme="http" /> <data android:scheme="https" /> <data android:host="${host}" android:path="/licenses" /> </intent-filter> android:autoVerify="true"
34. https://<host>/.well-known/assetlinks.json
35. https://<host>/.well-known/assetlinks.json [ { "relation": [ "delegate_permission/common.handle_all_urls" ], "target": { "namespace": "android_app", "package_name": "com.gdgnantes.devfest.android", "sha256_cert_fingerprints": [ "1A:24:9C:B5:69:5F:B5:21:CD:80:45:7A:06:20:C5:78:DB: 07:A8:CA:A0:8F:E9:47:B9:F6:A5:60:6B:78:DB:32" ] } } ]
36. https://<host>/.well-known/assetlinks.json [ { "relation": [ "delegate_permission/common.handle_all_urls" ], "target": { "namespace": "android_app", "package_name": "com.gdgnantes.devfest.android", "sha256_cert_fingerprints": [ "1A:24:9C:B5:69:5F:B5:21:CD:80:45:7A:06:20:C5:78:DB: 07:A8:CA:A0:8F:E9:47:B9:F6:A5:60:6B:78:DB:32" ] } } ] "relation": [ "delegate_permission/common.handle_all_urls" ]
37. https://<host>/.well-known/assetlinks.json [ { "relation": [ "delegate_permission/common.handle_all_urls" ], "target": { "namespace": "android_app", "package_name": "com.gdgnantes.devfest.android", "sha256_cert_fingerprints": [ "1A:24:9C:B5:69:5F:B5:21:CD:80:45:7A:06:20:C5:78:DB: 07:A8:CA:A0:8F:E9:47:B9:F6:A5:60:6B:78:DB:32" ] } } ] "namespace": "android_app" "target": { }
38. https://<host>/.well-known/assetlinks.json [ { "relation": [ "delegate_permission/common.handle_all_urls" ], "target": { "namespace": "android_app", "package_name": "com.gdgnantes.devfest.android", "sha256_cert_fingerprints": [ "1A:24:9C:B5:69:5F:B5:21:CD:80:45:7A:06:20:C5:78:DB: 07:A8:CA:A0:8F:E9:47:B9:F6:A5:60:6B:78:DB:32" ] } } ] "package_name": "com.gdgnantes.devfest.android" "target": { }
39. https://<host>/.well-known/assetlinks.json [ { "relation": [ "delegate_permission/common.handle_all_urls" ], "target": { "namespace": "android_app", "package_name": "com.gdgnantes.devfest.android", "sha256_cert_fingerprints": [ "1A:24:9C:B5:69:5F:B5:21:CD:80:45:7A:06:20:C5:78:DB: 07:A8:CA:A0:8F:E9:47:B9:F6:A5:60:6B:78:DB:32" ] } } ] "sha256_cert_fingerprints": [ "1A:24:9C:B5:69:5F:B5:21:CD:80:45:7A:06:20:C5:78:DB: 07:A8:CA:A0:8F:E9:47:B9:F6:A5:60:6B:78:DB:32" ] "target": { }
40. https://<host>/.well-known/assetlinks.json [ { "relation": [ "delegate_permission/common.handle_all_urls" ], "target": { "namespace": "android_app", "package_name": "com.gdgnantes.devfest.android", "sha256_cert_fingerprints": [ "1A:24:9C:B5:69:5F:B5:21:CD:80:45:7A:06:20:C5:78:DB: 07:A8:CA:A0:8F:E9:47:B9:F6:A5:60:6B:78:DB:32" ] } } ]
41. Modularise your code Break the app into features
42. Pointing out features
43. Licenses :features:licenses module Installable app :app module About :features:about module
44. What about the base APK? contains code/resources used in all modules
45. Application icon Custom font management Common styles, dimens, colors, … Base Activity/Fragment implementation Utilities etc. What about the base APK? contains code/resources used in all modules
46. Modularize action in Android Studio
47. ./settings.gradle include ':app', ':features:about', ':features:base', ':features:licenses', ':instant'
48. include ':app', ':features:about', ':features:base', ':features:licenses', ':instant' ./settings.gradle ':app'
49. include ':app', ':features:about', ':features:base', ':features:licenses', ':instant' ':features:base' ./settings.gradle
50. include ':app', ':features:about', ':features:base', ':features:licenses', ':instant' ':features:about' ./settings.gradle
51. include ':app', ':features:about', ':features:base', ':features:licenses', ':instant' ':instant' ./settings.gradle
52. apply plugin: 'com.android.feature' android { //... baseFeature true } dependencies { application project(':app') feature project(':features:about') feature project(':features:licenses') } ./features/base/build.gradle
53. apply plugin: 'com.android.feature' android { //... baseFeature true } dependencies { application project(':app') feature project(':features:about') feature project(':features:licenses') } ./features/base/build.gradle apply plugin: 'com.android.feature'
54. apply plugin: 'com.android.feature' android { //... baseFeature true } dependencies { application project(':app') feature project(':features:about') feature project(':features:licenses') } ./features/base/build.gradle baseFeature true
55. apply plugin: 'com.android.feature' android { //... baseFeature true } dependencies { application project(':app') feature project(':features:about') feature project(':features:licenses') } ./features/base/build.gradle application project(':app') feature project(':features:about') feature project(':features:licenses')
56. apply plugin: 'com.android.feature' android { //... baseFeature true } dependencies { application project(':app') feature project(':features:about') feature project(':features:licenses') } ./features/base/build.gradle
57. apply plugin: 'com.android.feature' //... dependencies { implementation project(':features:base') } ./features/about/build.gradle
58. apply plugin: 'com.android.application' //... dependencies { implementation project(':features:base') implementation project(':features:about') implementation project(':features:licenses') } ./app/build.gradle
59. apply plugin: ‘com.android.instantapp' //... dependencies { implementation project(':features:base') implementation project(':features:about') implementation project(':features:licenses') } ./instant/build.gradle
60. apply plugin: ‘com.android.instantapp' //... dependencies { implementation project(':features:base') implementation project(':features:about') implementation project(':features:licenses') } ./instant/build.gradle apply plugin: ‘com.android.instantapp'
61. apply plugin: ‘com.android.instantapp' //... dependencies { implementation project(':features:base') implementation project(':features:about') implementation project(':features:licenses') } ./instant/build.gradle
62. where Function returning the binary size of Total download bundle binary size
63. where Function returning the binary size of Maximum download bundle binary size
64. Maximum download bundle size (i.e. that weird “ ” constant)
65. During development ∞ Maximum download bundle size (i.e. that weird “ ” constant)
66. Play Store dev tracks 10MB During development ∞ Maximum download bundle size (i.e. that weird “ ” constant)
67. 4MB Play Store production Play Store dev tracks 10MB During development ∞ Maximum download bundle size (i.e. that weird “ ” constant)
68. The smaller, the better (not specific to Android only)
69. Slim down your APK size
70. Slim down your APK size Resource shrinking
71. Slim down your APK size Code minification Resource shrinking
72. Slim down your APK size Code minification Vector graphics Resource shrinking
73. Slim down your APK size Code minification Vector graphics Resource shrinking
74. Slim down your APK size Dependencies reduction Code minification Vector graphics Resource shrinking Downloadable fonts Resources de-duplication Remote fetching Images optimisation WebP format Granular dependencies Density bucket removal Native code architecture removal Wear 2.0 APK distribution Sparse translation elimination Version collapsing
75. APK Analyser
76. APK Analyser
77. Still not enough? Configuration split to the rescue
78. android { //... generatePureSplits true splits { abi { enable true } density { enable true } language { enable true include "en", "fr" } } } ./base.build.gradle
79. Installation prompts
80. dependencies { //... implementation 'com.google.android.instantapps:instantapps:1.1.0' } ./features/base/build.gradle
81. if (InstantApps.isInstantApp(this)) { val postInstallIntent = MainActivity.newIntent() InstantApps.showInstallPrompt(this, postInstallIntent, INSTALL_PROMPT_REQUEST_CODE, "Referrer") }
82. Keep user state after app installation
83. Cookie API // Instant app with(packageManager) { if (cookie.size <= instantAppCookieMaxBytes) { updateInstantAppCookie(cookie) } }
84. // Installable app val cookie = packageManager.instantAppCookie // ... (i.e. restore user data) packageManager.clearInstantAppCookie() Cookie API
85. Instant App Data dependencies { //... implementation 'com.google.android.gms:play-services-instantapps:11.4.2' } ./features/base/build.gradle
86. Instant App Data val client = InstantApps.getInstantAppsClient(this) val fileTask = client.instantAppData fileTask .addOnCompleteListener { readData(it.result) } .addOnFailureListener { handleException(it) }
87. Instant App Data Shared Preferences getFilesDir() getDir(String, int) Databases ParcelFileDescriptor to the caller's Instant App's data
88. Instant Apps in the real world aka the pros and cons
89. VS Instant apps Progressive Web apps
90. Thank you! cyrilmottier.com @cyrilmottier