What's new in Android 2018

This a deck that Google provide to share what is new in Android 2018.

1. What’s new in Android @L_de_V Laurence de Villers
2. What’s New In Android PI A s
3. Android App Bundle
4. Source: Partner provided data 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 APK size (MBs) Conversion rate decreases as apps get larger Play Store conversion rate (% of visitors who install) Trendline
5. xxhdpi hdpi xhdpi mdpi ldpi xxxhdpi
6. xxhdpi arm hdpi arm xhdpi arm mdpi arm ldpi arm xxxhdpi arm xxhdpi x86 hdpi x86 xhdpi x86 mdpi x86 ldpi x86 xxxhdpi x86
7. xxhdpi arm64 hdpi arm64 xhdpi arm64 mdpi arm64 ldpi arm64 xxxhdpi arm64 xxhdpi arm hdpi arm xhdpi arm mdpi arm ldpi arm xxxhdpi arm xxhdpi x86 hdpi x86 xhdpi x86 mdpi x86 ldpi x86 xxxhdpi x86 xxhdpi x86_64 hdpi x86_64 xhdpi x86_64 mdpi x86_64 ldpi x86_64 xxxhdpi x86_64
8. xxhdpi arm64 v:14 hdpi arm64 v: 16 xhdpi arm64 v:15 mdpi arm64 v:17 ldpi arm64 v:18 xxxhdpi arm64 v:13 xxhdpi arm v:20 hdpi arm v:22 xhdpi arm v:21 mdpi arm v:23 ldpi arm v:24 xxxhdpi arm v:19 xxhdpi x86 v: 8 hdpi x86 v:10 xhdpi x86 v:9 mdpi x86 v: 11 ldpi x86 v:12 xxxhdpi x86 v: 7 xxhdpi x86_64 v: 2 hdpi x86_64 v: 4 xhdpi x86_64 v:3 mdpi x86_64 v:5 ldpi x86_64 v: 6 xxxhdpi x86_64 v: 1
9. Android App Bundle Benefit from a smaller app Stop managing multiple APKs Deliver features on-demandBETA
10. Source: Partner provided data saving 11% saving 23% saving 45% saving 22% 28% saving ABA English Airbnb LinkedIn Perigee saving 49% RV AppStudios saving 64% Memrise Pluto. TV
11. Optimized APK for each device Upload an Android App Bundle Dynamic Delivery
12. /res/xxxhdpi classes.dex /res/xxhdpi config_xxxhdpi.apk base.apk config_xxxhdpi.apk /res/xhdpi /res/hdpi config_xhdpi.apk config_hdpi.apk /res/mhdpi /res/ldpi config_mhdpi.apk config_ldpi.apk /lib/x86 /lib/arm config_x86.apk config_arm.apk /res/values-en /res/values-fr config_en.apk config_fr.apk /res/values-es config_es.apk …
13. App Bundle APK
14. Android App Bundle Start today at g.co/androidappbundle
15. Android Jetpack Accelerate App Development
17. 95% supported devices
18. Refactor android.support.v4.* android.support.v7.* // etc. androidx.*
19. Jetpack Architecture
20. Jetpack Architecture Lifecycle Lifecycle Aware Components
21. Jetpack Architecture Lifecycle Lifecycle Aware Components ViewModel View data decoupled from OS lifecycle
22. Jetpack Architecture Lifecycle Lifecycle Aware Components ViewModel View data decoupled from OS lifecycle Room SQLite object mapping
23. Jetpack Architecture Lifecycle Lifecycle Aware Components ViewModel View data decoupled from OS lifecycle Room SQLite object mapping LiveData Lifecycle aware observables
24. Jetpack Architecture Lifecycle Lifecycle Aware Components ViewModel View data decoupled from OS lifecycle Paging (1.0!) Asynchronous data retrieval Room SQLite object mapping LiveData Lifecycle aware observables
25. Jetpack Architecture WorkManager Job scheduling Navigation Backstack and app flows PREVIEW
26. View Models Simplifying Android development
27. What is the hardest part of Android Development?
29. ViewModel onCleared()
30. ViewModel + LiveData onCleared() observe LiveData
31. ViewModel + LiveData onCleared() LiveData observe
32. ViewModel + LiveData onCleared() LiveData observe
33. ViewModel + LiveData onCleared() LiveData
34. ViewModel + LiveData onCleared() LiveData observe
35. ViewModel + LiveData onCleared() LiveData observe
36. ViewModel + LiveData onCleared() LiveData observe
37. ViewModel + LiveData onCleared() LiveData
38. Room A better way to do databases
39. 2016: How do you do Databases on Android?
40. Database SQLite App Logic Content Provider
41. Database Uri App Logic Content Provider SQLite
42. Database Content Values Uri App Logic Content Provider SQLite
43. App Logic Content Provider Database Content Values Uri SQLite Not type-safe
44. App Logic Content Provider Database Content Values Uri SQLite Not type-safe Not type-safe
45. App Logic Content Provider Database Content Values Uri SQLite Not type-safe Not type-safe
46. Room Database App Logic Content Provider Content Values Uri Not type-safe Not type-safe SQLite
47. Room DAO SQLite
48. Room SQL DAO View Model SQLite Type-safe
49. Room SQL Entities DAO View Model Type-safe Type-safe SQLite
50. WorkManager Backwards compatible background work PREVIEW
51. Battery Optimizations Optimize background tasks to stay charged longer
52. Unlimited Background Services Doze App Standby Limited Broadcasts Release Wakelocks Service Limitations App Standby Buckets Background Restrictions
53. There is still a lot of work to do Sending logs Uploading images and videos Syncing data Processing data
54. Basic Work: upload a photo upload
55. // A simple Worker class UploadPhotoWorker : Worker() { override fun doWork(): WorkerResult { uploadPhoto() return WorkerResult.SUCCESS } } SUCCESS FAILURE RETRY Runs on a background thread
56. // Creating a work request and enqueuing it val request: WorkRequest = OneTimeWorkRequestBuilder<UploadPhotoWorker>().build() WorkManager.getInstance().enqueue(request) Ω
57. What if you lose connectivity? Use constraints!
58. // Creating a work request with network constraints val constraints = Constraints.Builder() .setRequiredNetworkType(NetworkType.CONNECTED) .build() val request = OneTimeWorkRequestBuilder<UploadPhotoWorker>() .setConstraints(constraints) .build() WorkManager.getInstance().enqueue(request)
59. Show Progress upload
60. Chain Work compress upload
61. Parallel Work upload
62. Complex Flows filter filter filter compress upload
63. When to use? Best-Effort Exact Timing ThreadPool Coroutines ThreadPool Coroutines
64. When to use? Best-Effort Guaranteed Execution Exact Timing Deferrable ThreadPool Coroutines ThreadPool Coroutines Foreground Service
65. WorkManager Respects users battery Works with OS Backwards compatible (API14)
66. Navigation How to get around your app PREVIEW
67. Challenges for navigation Fragment Transactions Deep Links Passing Arguments Up and Back Errorprone Boilerplate Testing
68. Home Category Item https://... Need to be created and added to back stack on deep link
69. Navigation Graph A navigation graph is a blueprint of screens and the actions that link them.
70. Navigation Define navigation graph with visual tool / XML: Make a single navigate() call and runtime library handles everything
72. Safe Args Type-safe arguments when launching a Fragment
73. HelpFragment.kt if (!arguments.containsKey("screenName")) { throw IllegalArgumentException() } val category: Int = arguments.getInt("category") val screenName: String = arguments.getString("screenName")
74. HomeFragment.kt findViewById<Button>(R.id.help_button).setOnClickListener { v -> val helpDirections = HomeFragmentDirections.help("Home") helpDirections.category = 1703 v.findNavController().navigate(helpDirections) }
75. HelpFragment.kt val args : HelpFragmentArgs = HelpFragmentArgs.fromBundle(arguments) val screenName: String = args.screenName val category: Int = args.category
76. Navigation IDE tooling for app navigation Manage deeplinks Safe argument passing
77. Jetpack Architecture Start today at d.android.com/arch
78. Integration Tests e2e Tests Unit Tests Android Test Part of Jetpack
79. @RunWith(AndroidJUnit4::class) class SimpleUnifiedTest { @Test fun viewIsVisible() { assertEquals(view.visibility, View.VISIBLE) } } Failed: Expected 0 but was 16 F
80. @RunWith(AndroidJUnit4::class) class SimpleUnifiedTest { @Test fun viewIsVisible() { assertThat(view).isVisible() } } Failed: View was not visible F NEW
81. Core Platform changes in Android Pie
82. Battery App Standby Buckets usage based access to jobs, alarms, network, messaging Background Restriction user can restrict badly-behaved apps
83. Background Inputs & Privacy
84. Kotlin Performance & Compiler ART, D8, R8 Nullability support library and libcore
85. Android KTX Part of Jetpack Concise, readable code. A suite of libraries Android KTX, Testing KTX, ...
86. Background Text Measurement Text measurement is expensive Up to 80 to 90% of the draw/measure/layout loop Pre-computed text API offloads most of the work to a worker thread PrecomputedText.create(...)
87. Baseline distance
88. val tv: TextView // Distance from top to first baseline tv.firstBaselineToTopHeight = distancePx // Distance from bottom to last baseline tv.lastBaselineToBottomHeight = distancePx NEW
89. Security Unified BiometricDialog @deprecated FingerprintManager Stronger protection for private keys StrongBox backend Build.SERIAL doesn’t work anymore
90. System UI Integrating fully with Android
91. Display Cutouts Simulate notches in developer options (skip the electrical tape) WindowInsets#getDisplayCutout() android:windowLayoutInDisplayCutoutMode • mode=”never” • mode=”default” • mode=”shortEdges” + DisplayCutout#getSafeInsets() • mode=”shortEdges” + DisplayCutout#getBounds()
92. Slices A new approach to remote content • Within an app or between apps • Structured data, flexible templates • Interactive, updatable • Backwards-compatible! • (Support Library, KitKat/API 19+)
93. Actions Deep links into your app • “shortcuts with parameters” • “a visible Intent” Define actions in actions.xml Register with App Indexing to show as on-device search results
94. Notifications People love messages …so we focused on MessagingStyle • Inline images/stickers • Participant images • Smart reply UI • RemoteInput.setChoices() And more!
95. What’s New In Android Android App Bundle https://g.co/androidappbundle Android Jetpack https://d.android.com/jetpack https://d.android.com/kotlin https://d.android.com/arch https://d.android.com/arch/navigation https://d.android.com/arch/workmanager Core Platform App Standby Buckets Background Restrictions System UI Display Cutouts Slices & Actions Notifications
96. Thank You!