DevFest Pangyo 2019 ~ 최신 AndroidX 체크

DevFest Pangyo 2019에서 발표한 자료입니다.

Transcript

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()); }
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
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
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