DevFest Pangyo 2019 ~ 최신 AndroidX 체크

DevFest Pangyo 2019 ~ 최신 AndroidX 체크

DevFest Pangyo 2019에서 발표한 자료입니다.

354271902cd8ba2762d05b251dfa0f84?s=128

pluulove (노현석)

November 15, 2019
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  1. ୭न AndroidX ୓௼ pluulove

  2. ୭न AndroidX ୓௼ Google Developer Experts for Android GDG Korea

    Android Organizer Naver Noh HyeonSeok
  3. Index • Introduction AndroidX • Android Components • AndroidX in

    Android Dev Summit
  4. What is AndroidX?

  5. Question?! 1. AndroidXܳ ٜযࠌ׮? 2. Jetpackਸ ঌҊ੓׮? 3. Support Libraryо

    ӝরդ׮? 4. Android Architecture Components? 5. ੉ٜ੄ ର੉੼ਸ ঌҊ੓׮?
  6. Jetpack ۄ੉࠳۞ܻ, بҳ, о੉٘ ١੄ Ҋಿ૕ জਸ ࣚऔѱ ѐߊਸ ਤೠ

    ѐߊ ૑ஜ
  7. Jetpack == AndroidX - androidx.* ী ੓ח ۄ੉࠳۞ܻٜ - Jetpack

    Libraries - (ҳ) Support Libraries
  8. Jetpack Component AndroidX!!

  9. AndroidX Android ౱੉ Jetpack ղীࢲ ۄ੉࠳۞ܻܳ ѐߊ, పझ౟, ಁః૚, ߡ੹

    ҙܻ, ୹दೞחؘ ࢎਊೞח য়೑ࣗझ ೐۽ં౟ੑפ׮. https://developer.android.com/jetpack/androidx
  10. What's New in Android Support Library (Google I/O ’17)

  11. https://www.youtube.com/watch?v=V6-roIeNUY0

  12. https://www.youtube.com/watch?v=V6-roIeNUY0

  13. https://www.youtube.com/watch?v=V6-roIeNUY0

  14. Updated packaging • Android java ࣗझܳ ಁః૑߹۽ ܻಂష݂ ▪ Android.<feature>.ClassName

    • Maven ▪ androidx.<feature>:<feature>-<sub-feature> ▪ ೙ਃೠ ӝמ߹ ߓನ • -v7, -v4 ಁః૑ݺ ઁѢ
  15. AndroidX Component

  16. https://developer.android.com/jetpack/androidx/versions/

  17. https://developer.android.com/jetpack/androidx/versions/

  18. https://developer.android.com/jetpack/androidx/versions/

  19. https://developer.android.com/jetpack/androidx/versions/

  20. AndroidX Component - Total 70ѐ (2019.11.15) https://developer.android.com/jetpack/androidx/versions

  21. Activity & Fragment & Navigation - Activity 1.0.0(Stable) , 1.1.0-rc02(RC)

    - Fragment 1.1.0(Stable) , 1.2.0-rc02(RC) - Navigation 2.1.0(Stable) , 2.2.0-rc02(RC)
  22. class OldFragment : Fragment() { // Crazy fun backStart() {

    requireActivity().onBackPressed() } } җѢ Fragmentীࢲ onBackPressed // Crazy fun backStart() { requireActivity().onBackPressed() } // Safe override fun onAttach(context: Context) { super.onAttach(context) backListener = context as? BackListener backListener?.onBackPressed() }
  23. class MainFragment : Fragment() { private val dispatcher by lazy

    { requireActivity().onBackPressedDispatcher } private val backPressedCallback = object : OnBackPressedCallback(true) { override fun handleOnBackPressed() { // TODO } } override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) dispatcher.addCallback(this, backPressedCallback) } } Fragmentীࢲ onBackPressed ୊ܻ Back Pressed Flag
  24. // ComponentActivity.java public class ComponentActivity { private final OnBackPressedDispatcher mOnBackPressedDispatcher

    = new OnBackPressedDispatcher(new Runnable() { @Override public void run() { // fallbackOnBackPressed ComponentActivity.super.onBackPressed(); } }); @Override @MainThread public void onBackPressed() { mOnBackPressedDispatcher.onBackPressed(); } } // OnBackPressedDispatcher.java public final class OnBackPressedDispatcher { @MainThread public void onBackPressed() { Iterator<OnBackPressedCallback> iterator = mOnBackPressedCallbacks.descendingIterator(); while (iterator.hasNext()) { OnBackPressedCallback callback = iterator.next(); if (callback.isEnabled()) { callback.handleOnBackPressed(); return; } } if (mFallbackOnBackPressed != null) { mFallbackOnBackPressed.run(); } } } ComponentActivity / BackPressedDispatcher ൒ܴ
  25. // ComponentActivity.java public class ComponentActivity { private final OnBackPressedDispatcher mOnBackPressedDispatcher

    = new OnBackPressedDispatcher(new Runnable() { @Override public void run() { // fallbackOnBackPressed ComponentActivity.super.onBackPressed(); } }); @Override @MainThread public void onBackPressed() { mOnBackPressedDispatcher.onBackPressed(); } } // OnBackPressedDispatcher.java public final class OnBackPressedDispatcher { @MainThread public void onBackPressed() { Iterator<OnBackPressedCallback> iterator = mOnBackPressedCallbacks.descendingIterator(); while (iterator.hasNext()) { OnBackPressedCallback callback = iterator.next(); if (callback.isEnabled()) { callback.handleOnBackPressed(); return; } } if (mFallbackOnBackPressed != null) { mFallbackOnBackPressed.run(); } } } ComponentActivity / BackPressedDispatcher ൒ܴ
  26. // ComponentActivity.java public class ComponentActivity { private final OnBackPressedDispatcher mOnBackPressedDispatcher

    = new OnBackPressedDispatcher(new Runnable() { @Override public void run() { // fallbackOnBackPressed ComponentActivity.super.onBackPressed(); } }); @Override @MainThread public void onBackPressed() { mOnBackPressedDispatcher.onBackPressed(); } } ComponentActivity / BackPressedDispatcher ൒ܴ // OnBackPressedDispatcher.java public final class OnBackPressedDispatcher { @MainThread public void onBackPressed() { Iterator<OnBackPressedCallback> iterator = mOnBackPressedCallbacks.descendingIterator(); while (iterator.hasNext()) { OnBackPressedCallback callback = iterator.next(); if (callback.isEnabled()) { callback.handleOnBackPressed(); return; } } if (mFallbackOnBackPressed != null) { mFallbackOnBackPressed.run(); } } }
  27. // ComponentActivity.java public class ComponentActivity { private final OnBackPressedDispatcher mOnBackPressedDispatcher

    = new OnBackPressedDispatcher(new Runnable() { @Override public void run() { // fallbackOnBackPressed ComponentActivity.super.onBackPressed(); } }); @Override @MainThread public void onBackPressed() { mOnBackPressedDispatcher.onBackPressed(); } } // OnBackPressedDispatcher.java public final class OnBackPressedDispatcher { @MainThread public void onBackPressed() { Iterator<OnBackPressedCallback> iterator = mOnBackPressedCallbacks.descendingIterator(); while (iterator.hasNext()) { OnBackPressedCallback callback = iterator.next(); if (callback.isEnabled()) { callback.handleOnBackPressed(); return; } } if (mFallbackOnBackPressed != null) { mFallbackOnBackPressed.run(); } } } ComponentActivity / BackPressedDispatcher ൒ܴ
  28. // ComponentActivity.java public class ComponentActivity { private final OnBackPressedDispatcher mOnBackPressedDispatcher

    = new OnBackPressedDispatcher(new Runnable() { @Override public void run() { // fallbackOnBackPressed ComponentActivity.super.onBackPressed(); } }); @Override @MainThread public void onBackPressed() { mOnBackPressedDispatcher.onBackPressed(); } } // OnBackPressedDispatcher.java public final class OnBackPressedDispatcher { @MainThread public void onBackPressed() { Iterator<OnBackPressedCallback> iterator = mOnBackPressedCallbacks.descendingIterator(); while (iterator.hasNext()) { OnBackPressedCallback callback = iterator.next(); if (callback.isEnabled()) { callback.handleOnBackPressed(); return; } } if (mFallbackOnBackPressed != null) { mFallbackOnBackPressed.run(); } } } ComponentActivity / BackPressedDispatcher ൒ܴ
  29. LiveData & ViewModel - Lifecycle 2.1.0(Stable) , 2.2.0-rc02(RC)

  30. ViewModel ୡӝച lifecycle-viewmodel private val viewModel by lazy { ViewModelProviders.of(this).get<MainViewModel>()

    } This constructor was deprecated in API level 1.1.0. This class should not be directly instantiated
  31. ViewModel ୡӝച lifecycle-viewmodel val vm: VM = ViewModelProvider(this, factory).get(VM::class.java) val

    vm: VM = ViewModelProvider(this).get(VM::class.java) public ViewModelProvider(@NonNull ViewModelStoreOwner owner) { this(owner.getViewModelStore(), owner instanceof HasDefaultViewModelProviderFactory ? ((HasDefaultViewModelProviderFactory) owner).getDefaultViewModelProviderFactory() : NewInstanceFactory.getInstance()); }
  32. None
  33. Support Coroutines in ViewModel After lifecycle-viewmodel-ktx 2.1.0 val ViewModel.viewModelScope: CoroutineScope

    get() { val scope: CoroutineScope? = this.getTag(JOB_KEY) if (scope != null) { return scope } return setTagIfAbsent(JOB_KEY, CloseableCoroutineScope(SupervisorJob() + Dispatchers.Main.immediate)) } To be continue…
  34. AndroidX in

  35. #AndroidDevSummit

  36. #AndroidDevSummit

  37. #AndroidDevSummit

  38. #AndroidDevSummit

  39. #AndroidDevSummit @Composable fun FilteredList(contacts: List<Contact>, filterText: String = "") {

    val state = +state { filterText } VerticalScroller { Column { TextField(filterText, onValueChange = { state.value = it }) contacts.filter { it.contains(state.value) }.forEach { Row { Image(it.photo) Text(it.name) } } } } }
  40. #AndroidDevSummit • Simplify • Fix what’s broken • No more

    cheating • Material + Animations • Compatibility Jetpack Compose
  41. #AndroidDevSummit Android Studio Live preview, Apply Changes Compose Compiler Plugin

    Code generation extensions kotlinc Upstream Kotlin compiler (1.4) Compose UI Foundation Standard layouts, interactions Compose UI Core Input, Measure, Layout, Drawing Compose Runtime Tree management, Effects Compose UI Material Surface, Buttons, Tabs, Themes Compose Build time (development host) Runtime (on device)
  42. #AndroidDevSummit Compose UI Foundation Standard layouts, interactions Compose UI Core

    Input, Measure, Layout, Drawing Compose UI Material Surface, Buttons, Tabs, Themes BUTTON Gestures, accessibility, & other internals
  43. Jetpack Compose • I/O 19, Unbundled • Announced Android Studio

    4.0 Canary 1 in Android Dev Summit • Last Release 0.1.0-dev02
  44. android/compose-samples https://github.com/android/compose-samples/tree/master/JetNews

  45. android/compose-samples https://github.com/android/compose-samples/tree/master/JetNews

  46. android/compose-samples https://github.com/android/compose-samples/tree/master/JetNews

  47. Compose Sample

  48. Compose Sample https://github.com/Pluu/JetpackCompose_Sample

  49. ConstraintLayout in Compose WIP Case1 Link : https://android- review.googlesource.com/c/ platform/frameworks/support/

    +/1137175 Maybe Merge?
  50. Maybe Merge? ConstraintLayout in Compose WIP Case2 Link : https://android-

    review.googlesource.com/c/ platform/frameworks/support/ +/1147725
  51. ੉ઁ খਵ۽ 75੢ թও֎ਃ!!

  52. #AndroidDevSummit

  53. #AndroidDevSummit Using FragmentScenario @Test fun testEventFragment() { val scenario =

    launchFragmentInContainer<MyFragment>() onView(withId(R.id.refresh)).perform(click()) scenario.onFrament { fragment -> // Check that the fragment handled the click correctly. } }
  54. #AndroidDevSummit Using FragmentScenario @Test fun testEventMoveToCreatedFragment() { val scenario =

    launchFragmentInContainer<MyFragment>() scenario.moveToState(State.CREATED) } @Test fun testEventFragment() { val scenario = launchFragmentInContainer<MyFragment>() scenario.recreate() }
  55. #AndroidDevSummit Using FragmentFactory private class MyFactory() : FragmentFactory() { override

    fun instantiate( classLoader: ClassLoader, className: String ) = when (className) { MyFragment::class.java.name -> MyFragment(...) else -> super.instantiate(classLoader, className) } } override fun onCreate(savedInstanceState: Bundle?) { supportFragmentManager.fragmentFactory = MyFactory() super.onCreate(savedInstanceState) }
  56. used add/replace

  57. None
  58. None
  59. None
  60. FragmentContainerView extends FrameLayout • Fragmentਊ Container ◦ AddView => IllegalStateException

    • <fragment> / <FrameLayout>ܳ ؀୓ • Z-index ޙઁ ೧Ѿ • 3о૑ ੘সਸ ૓೯ ◦ ࢜۽਍ Fragment ੋझఢझ ࢤࢿ ◦ Fragment.onInflate(Context, AttributeSet, Bundle) ഐ୹ ◦ FragmentTransactionਸ प೯ೞৈ FragmentManagerী ୶о
  61. FragmentContainerView <androidx.fragment.app.FragmentContainerView xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:id="@+id/fragment_container_view" android:layout_width="match_parent" android:layout_height="match_parent" />

  62. FragmentContainerView <androidx.fragment.app.FragmentContainerView xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:id="@+id/fragment_container_view" android:name="com.example.MyFragment" android:tag="my_tag" android:layout_width="match_parent" android:layout_height="match_parent" />

  63. FrameLayout FragmentContainerView

  64. ViewModel ୡӝച // activity-ktx val activityVM : ActivityViewModel by viewModels()

    // fragment-ktx val fragmentViewModel : MyViewModel by viewModels() val activityViewModel : MyViewModel by activityViewModels() // navigation-ktx val navGraphViewModel: MyViewModel by navGraphViewModels(R.id.main)
  65. #AndroidDevSummit

  66. ROOM • SQLiteী ؀ೠ ୶࢚ച ҅க ઁҕ • ஹ౵ੌ ఋ੐ী

    Query ୓௼ • Migration੉ ए਑ • పझ౟ೞӝ ए਑ #AndroidDevSummit • RxJava/Coroutines ૑ਗ • Raw ௪ܻ ૑ਗ • AndroidX ݃੉Ӓۨ੉࣌ • Full Text Search • Views
  67. Room - 2.2.1(Stable) #AndroidDevSummit

  68. #AndroidDevSummit Async queres Query Type Observable Read One-Shot Read /

    Write Lifecycle RxJava Coroutines LiveData Publisher, Observable, Flowable Flowable N/A Single, Maybe, Completale suspend fun New!
  69. Flow 101 - Kotlin coroutine primitive - Asynchronous - Cold

    stream • transform stream (e.g. map, filter) • consume data (e.g. collect, single, toList)
  70. Flow Example fun getDogsToPet(limit: Int = -1): Flow<Dog> = flow

    { var i = 0 while (limit < 0 || i > limit) { emit(getRandomDog()) i++ } }
  71. Flow Example https://twitter.com/FMuntenescu/status/1186484362327384064

  72. Pre-packaged databases #AndroidDevSummit

  73. ୡӝ DB ؘ੉ఠ ࢸ஖ (җѢ) 1. Database ৌӝ 2. Schema

    Ѩૐ 3. Database File ਫ਼Ә 4. Thread زӝച 5. Content ࠂࢎ 6. Database ײӝ #AndroidDevSummit
  74. #AndroidDevSummit Room.databaseBuilder(appContext, TestDatabase.class, "Sample.db") .createFromFile(File("mypath")) .build() Room.databaseBuilder(appContext, TestDatabase.class, "Sample.db") .createFromAsset("database/myapp.db")

    .build() New! New!
  75. Definition Relations - One-to-One - Many-to-Many #AndroidDevSummit

  76. One-to-One Example

  77. One-to-Many Example

  78. #AndroidDevSummit

  79. #AndroidDevSummit

  80. #AndroidDevSummit Coroutines

  81. #AndroidDevSummit • Easy to get off main thread • Minimal

    boilerplate • Structured concurrency = managed jobs Coroutines ੢੼
  82. #AndroidDevSummit ViewModel class MainActivityViewModel : ViewModel { init { viewModelScope.launch

    { // start } } }
  83. #AndroidDevSummit class MyActivity : Activity { override fun onCreate(state: Bundle?)

    { super.onCreate(state) lifecycleScope.launch { // Run } lifecycleScope.launchWhenResumed { // Run } } } Activities & Fragments lifecycleScope.launchWhenResumed { // Run }
  84. #AndroidDevSummit ViewModel + LiveData class MainActivityViewModel : ViewModel { private

    val _result = MutableLiveData<String>() val result = LiveData<String> = _result init { viewModelScope.launch { val computationResult = doComputation() _result.value = computationResult } } }
  85. #AndroidDevSummit liveData coroutine builder class MyViewModel { val result =

    liveData { emit(doComputation()) } } After lifecycle 2.2 liveData(Dispatchers.IO) { emit(LOADING.STRING) emitSource(dataSource.fetchWeather()) } 1 2 LiveData
  86. #AndroidDevSummit After lifecycle 2.2 Multiple values with LiveData

  87. #AndroidDevSummit After lifecycle 2.2 Streams with Flow

  88. emit N Values val currentWeather: LiveData<String> = dataSource.fetchWeather() LiveData →

    LiveData Flow → LiveData val currentWeatherFlow: LiveData<String> = liveData { dataSource.fetchWeatherFlow().collect { emit(it) } }
  89. emit N Values LiveData → LiveData Flow → LiveData val

    currentWeather: LiveData<String> = dataSource.fetchWeather() val currentWeatherFlow: LiveData<String> = dataSource.fetchWeatherFlow().asLiveData()
  90. emit 1 + emit N Values val currentWeather: LiveData<String> =

    liveData { emit(LOADING_STRING) emitSource(dataSource.fetchWeather()) } LiveData → LiveData Flow → LiveData val currentWeatherFlow: LiveData<String> = liveData { emit(LOADING_STRING) emitSource( dataSource.fetchWeatherFlow().asLiveData() ) }
  91. emit 1 + emit N Values val currentWeather: LiveData<String> =

    liveData { emit(LOADING_STRING) emitSource(dataSource.fetchWeather()) } LiveData → LiveData Flow → LiveData val currentWeatherFlow: LiveData<String> = dataSource.fetchWeatherFlow() .onStart { emit(LOADING_STRING) } .asLiveData()
  92. Transformation val currentWeather: LiveData<String> = dataSource.fetchWeather().map { // Run }

    LiveData → LiveData
  93. Suspend transformation val currentWeather: LiveData<String> = dataSource.fetchWeather().switchMap { liveData {

    emit(heavyTransformation(it)) } } LiveData → LiveData
  94. Suspend transformation val currentWeather: LiveData<String> = dataSource.fetchWeather().switchMap { liveData {

    emit(heavyTransformation(it)) } } LiveData → LiveData val currentWeatherFlow: LiveData<String> = dataSource.fetchWeatherFlow() .map { heavyTransformation(it) } .asLiveData() } Flow → LiveData
  95. #AndroidDevSummit

  96. CameraX - 1.0.0-alpha06 (Alpha)

  97. Android Dev Summit Focus +{API} HDR Capabilities Stability Extension

  98. #AndroidDevSummit +{API} New Capabilities • Tap to focus • Zoom

    control • Device rotation info • Flash availability • And a lot more!
  99. #AndroidDevSummit Focus Pinch Zoom Zoom Slider

  100. #AndroidDevSummit HDR Extensions • Expanding footprint with additional manufactures •

    Two lines of code enables Extensions across all of them!
  101. #AndroidDevSummit

  102. #AndroidDevSummit // Set up use case // Step 1. Config

    val imageCapture = ImageCaptureConfig.Builder() .setTargetResolution(Size(600, 800)) .build() // Step 2. Bind CameraX.bindToLifecycle(this, imageCapture) // Step 3. Act imageCapture.takePicture(...)
  103. CameraXView <androidx.camera.view.CameraView android:id="@+id/view_camera" android:layout_width="match_parent" android:layout_height="match_parent" /> CameraX#bindToLifecycle(LifecycleOwner) CameraView#takePicture(...) CameraView#startRecording(...) CameraView#stopRecording()

    CameraX.unbindAll()
  104. #AndroidDevSummit Beta 2019֙ 12ਘ ৘੿!! • Stable API • Higher

    code quality • Read for production
  105. #AndroidDevSummit

  106. Release - ConstraintLayout 2.0.0-beta3 - Motion Editor in Android Studio

    4.0 Canary 1
  107. None
  108. None
  109. #AndroidDevSummit

  110. What is benchmarking? - ௏٘ ࢿמ ஏ੿ - ஏ੿ػ Ѿҗ۽

    ѐࢶ ߈৔ - ੹୓ ೐۽Ӓ۔ प೯ Improving App Performance with Benchmarking (Google I/O ’19) https://www.youtube.com/watch?v=ZffMCJdA5Qc
  111. Source : https://www.youtube.com/watch?v=ZffMCJdA5Qc Benchmark @Test fun myFirstBenchmark() { val worker

    = TestListenableWorkerBuilder<MyWorker>(context).build() val COUNT = 5 // Small iteration count val start = System.nanoTime() // Measuring immediately for (i in 0..COUNT) { worker.doWork() } // Includes outliers! val elapsed = (System.nanoTime() - start) Log.d("Benchmark", "Time taken was $elapsed ns") }
  112. Source : https://www.youtube.com/watch?v=ZffMCJdA5Qc Benchmark @Test fun myFirstBenchmark() { val worker

    = TestListenableWorkerBuilder<MyWorker>(context).build() val COUNT = 5 // Small iteration count val start = System.nanoTime() // Measuring immediately for (i in 0..COUNT) { worker.doWork() } // Includes outliers! val elapsed = (System.nanoTime() - start) Log.d("Benchmark", "Time taken was $elapsed ns") }
  113. Source : https://www.youtube.com/watch?v=ZffMCJdA5Qc Benchmark @Test fun myFirstBenchmark() { val worker

    = TestListenableWorkerBuilder<MyWorker>(context).build() val COUNT = 5 // Small iteration count val start = System.nanoTime() // Measuring immediately for (i in 0..COUNT) { worker.doWork() } // Includes outliers! val elapsed = (System.nanoTime() - start) Log.d("Benchmark", "Time taken was $elapsed ns") }
  114. Source : https://www.youtube.com/watch?v=ZffMCJdA5Qc Benchmark @get:Rule val benchmarkRule = BenchmarkRule() @Test

    fun myFirstBenchmark() { val worker = TestListenableWorkerBuilder<MyWorker>(context).build() val COUNT = 5 // Small iteration count val start = System.nanoTime() // Measuring immediately for (i in 0..COUNT) { worker.doWork() } // Includes outliers! val elapsed = (System.nanoTime() - start) Log.d("Benchmark", "Time taken was $elapsed ns") }
  115. Source : https://www.youtube.com/watch?v=ZffMCJdA5Qc Benchmark @get:Rule val benchmarkRule = BenchmarkRule() @Test

    fun myFirstBenchmark() { val worker = TestListenableWorkerBuilder<MyWorker>(context).build() benchmarkRule.measureRepeated { worker.doWork() } }
  116. RecyclerView Benchmark @get:Rule val activityRule = ActivityTestRule(MainActivity::class.java) @get:Rule val benchmarkRule

    = BenchmarkRule() @UiThreadTest @Test fun simpleScroll() { val recyclerView = activityRule.activity.recyclerView benchmarkRule.measureRepeated { val heightOfLastItem = recyclerView.getLastChild().height recyclerView.scrollBy(0, heightOfLastItem) } } https://github.com/android/performance-samples/blob/master/BenchmarkSample/benchmark/ src/androidTest/java/com/example/benchmark/RecyclerViewBenchmark.kt
  117. @get:Rule val activityRule = ActivityTestRule(MainActivity::class.java) @get:Rule val benchmarkRule = BenchmarkRule()

    @UiThreadTest @Test fun simpleScroll() { val recyclerView = activityRule.activity.recyclerView benchmarkRule.measureRepeated { val heightOfLastItem = recyclerView.getLastChild().height recyclerView.scrollBy(0, heightOfLastItem) } } https://github.com/android/performance-samples/blob/master/BenchmarkSample/benchmark/ src/androidTest/java/com/example/benchmark/RecyclerViewBenchmark.kt RecyclerView Benchmark
  118. RecyclerView Benchmark @get:Rule val activityRule = ActivityTestRule(MainActivity::class.java) @get:Rule val benchmarkRule

    = BenchmarkRule() @UiThreadTest @Test fun simpleScroll() { val recyclerView = activityRule.activity.recyclerView benchmarkRule.measureRepeated { val heightOfLastItem = recyclerView.getLastChild().height recyclerView.scrollBy(0, heightOfLastItem) } } https://github.com/android/performance-samples/blob/master/BenchmarkSample/benchmark/ src/androidTest/java/com/example/benchmark/RecyclerViewBenchmark.kt
  119. RecyclerView Benchmark @get:Rule val activityRule = ActivityTestRule(MainActivity::class.java) @get:Rule val benchmarkRule

    = BenchmarkRule() @UiThreadTest @Test fun simpleScroll() { val recyclerView = activityRule.activity.recyclerView benchmarkRule.measureRepeated { val heightOfLastItem = recyclerView.getLastChild().height recyclerView.scrollBy(0, heightOfLastItem) } } https://github.com/android/performance-samples/blob/master/BenchmarkSample/benchmark/ src/androidTest/java/com/example/benchmark/RecyclerViewBenchmark.kt
  120. RecyclerView Benchmark @get:Rule val activityRule = ActivityTestRule(MainActivity::class.java) @get:Rule val benchmarkRule

    = BenchmarkRule() @UiThreadTest @Test fun simpleScroll() { val recyclerView = activityRule.activity.recyclerView benchmarkRule.measureRepeated { val heightOfLastItem = recyclerView.getLastChild().height recyclerView.scrollBy(0, heightOfLastItem) } } https://github.com/android/performance-samples/blob/master/BenchmarkSample/benchmark/ src/androidTest/java/com/example/benchmark/RecyclerViewBenchmark.kt
  121. RecyclerView Benchmark @get:Rule val activityRule = ActivityTestRule(MainActivity::class.java) @get:Rule val benchmarkRule

    = BenchmarkRule() @UiThreadTest @Test fun simpleScroll() { val recyclerView = activityRule.activity.recyclerView benchmarkRule.measureRepeated { val heightOfLastItem = recyclerView.getLastChild().height recyclerView.scrollBy(0, heightOfLastItem) } } https://github.com/android/performance-samples/blob/master/BenchmarkSample/benchmark/ src/androidTest/java/com/example/benchmark/RecyclerViewBenchmark.kt
  122. RecyclerView Benchmark @get:Rule val activityRule = ActivityTestRule(MainActivity::class.java) @get:Rule val benchmarkRule

    = BenchmarkRule() @UiThreadTest @Test fun simpleScroll() { val recyclerView = activityRule.activity.recyclerView benchmarkRule.measureRepeated { val heightOfLastItem = recyclerView.getLastChild().height recyclerView.scrollBy(0, heightOfLastItem) } } https://github.com/android/performance-samples/blob/master/BenchmarkSample/benchmark/ src/androidTest/java/com/example/benchmark/RecyclerViewBenchmark.kt
  123. RecyclerView Benchmark @get:Rule val activityRule = ActivityTestRule(MainActivity::class.java) @get:Rule val benchmarkRule

    = BenchmarkRule() @UiThreadTest @Test fun simpleScroll() { val recyclerView = activityRule.activity.recyclerView benchmarkRule.measureRepeated { val heightOfLastItem = recyclerView.getLastChild().height recyclerView.scrollBy(0, heightOfLastItem) } } https://github.com/android/performance-samples/blob/master/BenchmarkSample/benchmark/ src/androidTest/java/com/example/benchmark/RecyclerViewBenchmark.kt
  124. RecyclerView Benchmark Without Time runWithTimingDisabled(…)

  125. Stable Activity AppCompat Lifecycle Navigation Room Work Autofill Benchmark Biometric

    Coordinator Layout Fragment Lifecycle ViewModel-SavedState Navigation RecyclerView ViewPager2 ConstraintLayout RC Beta Alpha Ads Browser Camera Car Compose Security
  126. Watch the talks and learn more! Android Dev Summit 2019

  127. Watch the talks and learn more! Android Dev Summit 2019

    END