What's new in Jetpack / I/O Extended Japan 2022

Transcript

1. What's new
   in Jetpack
   

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2. Room, Navigation, and more..
   Architecture
   

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3. ● KSPサポート
   ● Auto Migrations
   ● Relational Query Methods
   ● Paging 3.0サポート(androidx.room:room-paging)
   ● Kotlinへの書き換え
   Room
   

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4. @Database(
   entities = [ /* .. */ ],
   version = 3,
   autoMigrations = [
   AutoMigration(from = 1, to = 2),
   AutoMigration(
   from = 2, to = 3,
   spec = AppDatabase.AutoMigration2to3::class
   )
   ]
   )
   abstract class AppDatabase : RoomDatabase() {
   @RenameTable(fromTableName = "user", toTableName = "users")
   class AutoMigration2to3 : AutoMigrationSpec
   }
   Auto Migrations
   

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5. @Query(
   "SELECT * FROM user " +
   "JOIN book on user.id = book.user_id"
   )
   fun getUserAndBook(): Map>
   @MapInfo(keyColumn = "userName", valueColumn = "bookName")
   @Query(
   "SELECT user.name AS userName, book.name AS bookName FROM user " +
   "JOIN book on user.id = book.user_id"
   )
   fun getUserAndBookNames(): Map>
   Relational Query Methods
   

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6. ● Rx, GuavaのサポートがStable
   ● LoadResult.Invalidの追加
   ● 新しいEvent Listener
   Paging 3
   

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7. adapter.addOnPagesUpdatedListener {
   // ...
   }
   lifecycleScope.launch {
   repeatOnLifecycle(Lifecycle.State.STARTED) {
   adapter.onPagesUpdatedFlow.collect {
   // ...
   }
   }
   }
   Event Listener
   

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8. ● Multiple Back Stacksサポート
   ● 2ペインレイアウトサポート (AbstractListDetailFragment)
   ● Kotlinへの書き換え
   Navigation
   

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9. class ListDetailFragment: AbstractListDetailFragment() {
   override fun onCreateListPaneView(/* */): View {
   return inflater.inflate(R.layout.list_pane, container, false)
   }
   override fun onListPaneViewCreated(/* */) {
   super.onListPaneViewCreated(view, savedInstanceState)
   val recyclerView = view as RecyclerView
   recyclerView.adapter = ListDetailAdapter(/* */)
   }
   override fun onCreateDetailPaneNavHostFragment(): NavHostFragment {
   return NavHostFragment.create(R.navigation.list_detail_nav_graph)
   }
   }
   AbstractListDetailFragment
   

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10. ● SharedPreferencesの代替
    ● MAD SKills: http://goo.gle/mad-skills-datastore
    DataStore
    

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11. ● Jetpackライブラリを使った設計ガイド
    ● MAD SKills: http://goo.gle/mad-skills-architecture
    Architecture
    

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12. Baseline Profiles, JankStats, and more…
    Performance
    

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13. ● Jankの追跡
    ● ユーザーの状態把握
    ● 毎Frameで結果をレポート
    JankStats
    

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14. val metricsStateHolder = PerformanceMetricsState.getForHierarchy(view)
    val jankStats = JankStats.createAndTrack(
    window = window,
    executor = Dispatchers.Default.asExecutor(),
    frameListener = { frameData ->
    if (frameData.isJank) {
    // ...
    }
    }
    )
    metricsStateHolder.state?.addState("Activity", javaClass.simpleName)
    JankStats
    

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15. ● baseline-profile.txt
    ● 初回起動時の最適化
    ● 一部Jetpackライブラリには追加済み
    Baseline Profiles
    

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16. ● 起動やスクロールのパフォーマンス計測
    ● TraceSectionMetric / AudioUnderrunMetric
    ● Baseline Profilesの生成
    Macrobenchmark
    

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17. TraceSectionMetric
    benchmarkRule.measureRepeated(
    packageName = TARGET_PACKAGE,
    metrics = listOf(
    FrameTimingMetric(),
    TraceSectionMetric("RV CreateView"),
    TraceSectionMetric("RV OnBindView"),
    ),
    // ...
    }
    trace("RV OnBindView") {
    // ...
    }
    

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18. ● debuggable falseでパフォーマンスプロファイリング可能
    ● API Level 14
    Tracing
    

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19. WindowManager, AppCompat, and more…
    User Interface
    

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20. ● WindowMetrics
    ● Foldable
    ● SlidingPaneLayoutの改善
    WindowManager
    

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21. WindowMetrics
    val currentWindowMetrics = WindowMetricsCalculator.getOrCreate()
    .computeCurrentWindowMetrics(this)
    val maximumWindowMetrics = WindowMetricsCalculator.getOrCreate()
    .computeMaximumWindowMetrics(this)
    

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22. Foldable
    lifecycleScope.launch {
    lifecycle.repeatOnLifecycle(Lifecycle.State.STARTED) {
    WindowInfoTracker.getOrCreate(activity)
    .windowLayoutInfo(activity)
    .collect { layoutInfo ->
    val foldingFeature =
    layoutInfo.displayFeatures.firstOrNull() as? FoldingFeature
    foldingFeature?.state // => FLAT, HALF_OPENED
    foldingFeature?.orientation // => VERTICAL, HORIZONTAL
    foldingFeature?.bounds // > Rect
    }
    }
    }
    

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23. ● DropHelper
    DragAndDrop
    

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24. DragAndDrop
    val options = DropHelper.Options.Builder()
    .setHighlightColor(highlightColor)
    .setHighlightCornerRadiusPx(cornerRadiusPx)
    .build()
    DropHelper.configureView(
    activity,
    targetView,
    arrayOf(ClipDescription.MIMETYPE_TEXT_PLAIN),
    options,
    ) { view, payload ->
    // ...
    }
    

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25. ● Emoji2サポート
    ● アプリごとの言語設定
    AppCompat
    

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26. val appLocale = LocaleListCompat.forLanguageTags("ja")
    AppCompatDelegate.setApplicationLocales(appLocale)
    android:name="androidx.appcompat.app.AppLocalesMetadataHolderService"
    android:enabled="false"
    android:exported="false">
    android:name="autoStoreLocales"
    android:value="true" />
    
    アプリ言語設定
    

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27. ● 1.2 Beta
    ● Nested Scrollとの相互互換
    ● Downloadable Fonts
    ● Lazy Layout
    ● and more…
    Jetpack Compose
    

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28. Thank you!
    Android, Kotlin GDE
    he / him
    @STAR_ZERO
    https://www.youtube.com/watch
    ?v=jTd82lcuHTU
    Resources
    Kenji Abe
    

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