Google I/O 2022 Recap: Dev Tools & Jetpack

Ken Baldauf

Senior Software Engineer @ Acorns

View Compose animations with animation preview
Track Compose recomposition counts in layout inspector
Can generate multiple Compose Previews at once with a custom defined annotation class
Improved Wear OS emulator pairing & run configurations
New Logcat V2: sports improved formatting & search
Adds support for Gradle Managed Test Devices
- Ability to define & manage virtual devices via Gradle
Debug coroutines on API 29+ with coroutine-core 1.6.0+

Live Edit allows Compose Preview to update in real time
- Experimental feature focussed on UI/UX code changes
- No current support for new or method name changes
Resizable emulators
- test multiple screen sizes with a single emulator
With API 33, you can now pair 2 emulators with virtual bluetooth
Experimentally mirror physical device in Android Studio
Integration with Google Play SDK Index
- Provides insights into over 100 widely used SDKs
View App Quality Insights from Firebase Crashlytics

A platform built in collaboration with Samsung
Unifies health data from multiple devices & apps
Devs: single API for reading/writing health & fitness data
Users: control over data access + secure on device storage
Tracks activity, measurements, nutrition, sleep & vitals
Samsung Health, Google Fit, Fitbit, MyFitnessPal, Leap Fitness & Withings are all onboard
Will support API 28+ on device with Google Play Services
androidx.health is currently available via a Jetpack Alpha

Compose 1.2 & Compose for Wear OS are both in Beta
Adds support for android:includeFontPadding=false
Downloadable font support
- Async access Google Fonts & define fallback fonts
Improves text magnifier added in Compose 1.1
Define custom lazy layouts with experimental LazyLayout
Insets move from Accompanist to Compose Foundation
Navigation Component is now integrated into Compose
Material 3: window size classes
- Opinionated breakpoints that categorize height/width
- Balance simplicity with various device form factors

Room 2.4 - Stable
- Stable support for Kotlin Symbol Processing (KSP)
  - 2x compilation speed improvement of KAPT
- Adds support for auto migrations
- Built-in support for Paging 3.0
Room 2.5 - Alpha
- Start of a full Kotlin rewrite
  - Converted room-common, room-migration & paging from room-runtime

Measure app start-up & scrolling performance
Version 1.1 has reach release candidate
- Features improvements to testing speed
- Can now be setup via Android Studio
- Capture allocation counts & output results in IDE
- Load traces in Android Studio for inspection
- Generate custom Baseline Profiles
Baseline Profiles: list of classes/methods included in APK
- Android Runtime (ART) will use list to perform Ahead-of-time (AOT) compilation
- Faster launch times if AOT methods used in startup

Paging 3.1 Stable: adds support for Rx & Guava
Tracing 1.1 Stable: enables profiling in non-debug builds
- Now API 14+; Previously only feasible on API 29+
Annotation is migrating to Kotlin & adding highly requested annotations
- Ex: @DeprecatedSince inspired by @RequiresApi
AppCompat 1.6 Alpha: backports Android 13's per-app language settings to API 14
Launched series of Modern Android Development Skills videos focussed on Jetpack's Architecture components
Over 100 projects now on GitHub

Launch of Flutter 3
- Coincides with Dart 2.17
Now fully native on Apple Silicon for development
Completes change from mobile-centric to multiplatform
- Adds stable support for macOS & Linux
  - Supports both Intel & Apple Silicon for macOS with Universal Binary
- Supports Android, iOS, Web, Windows, macOS + Linux