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1. ୭न AndroidX ୓௼ @pluu Full Version
2. ୭न AndroidX ୓௼ Google Developer Experts for Android GDG Korea Android Organizer Noh HyeonSeok
3. Index • Introduction AndroidX • Android Components • AndroidX in Android Dev Summit • Migration
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. Source : https://www.youtube.com/watch?v=V6-roIeNUY0
12. Source : https://www.youtube.com/watch?v=V6-roIeNUY0
13. Source : 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 (2019.11.29) - Support, UI - Benchmark, Migration … etc
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. Merged ConstraintLayout in Compose Link : http://bit.ly/2rIbAao
50. #AndroidDevSummit
51. #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. } }
52. #AndroidDevSummit Using FragmentScenario @Test fun testEventMoveToCreatedFragment() { val scenario = launchFragmentInContainer<MyFragment>() scenario.moveToState(State.CREATED) } @Test fun testEventFragment() { val scenario = launchFragmentInContainer<MyFragment>() scenario.recreate() }
53. #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) }
54. used add/replace
58. 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
59. 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" />
60. 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" />
61. // FirstFragment, SecondFragment parentFragmentManager .beginTransaction() .setCustomAnimations( R.anim.nav_enter, R.anim.nav_exit ) .replace(R.id.container, /**...*/ ) .addToBackStack(null) .commit() FrameLayout Not desired result
62. FrameLayout FragmentContainerView
63. 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)
64. #AndroidDevSummit
65. ROOM #AndroidDevSummit • RxJava/Coroutines ૑ਗ • Raw ௪ܻ ૑ਗ • AndroidX ݃੉Ӓۨ੉࣌ • Full Text Search • Views • SQLiteী ؀ೠ ୶࢚ച ҅க ઁҕ • ஹ౵ੌ ఋ੐ী Query ୓௼ • Migration੉ ए਑ • పझ౟ೞӝ ए਑ • Last 2.2.2(Stable)
66. #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!
67. Flow 101 - Kotlin coroutine primitive - Asynchronous - Cold stream • transform stream (e.g. map, filter) • consume data (e.g. collect, single, toList)
68. Flow Example fun getDogsToPet(limit: Int = -1): Flow<Dog> = flow { var i = 0 while (limit < 0 || i > limit) { emit(getRandomDog()) i++ } }
69. Flow Example https://twitter.com/FMuntenescu/status/1186484362327384064
70. Pre-packaged databases #AndroidDevSummit
71. 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
72. #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!
73. Definition Relations - One-to-One - Many-to-Many #AndroidDevSummit
74. One-to-One Example
75. One-to-Many Example
76. #AndroidDevSummit
77. #AndroidDevSummit
78. #AndroidDevSummit Coroutines
79. #AndroidDevSummit • Easy to get off main thread • Minimal boilerplate • Structured concurrency = managed jobs Coroutines ੢੼
80. #AndroidDevSummit ViewModel class MainActivityViewModel : ViewModel { init { viewModelScope.launch { // start } } }
81. #AndroidDevSummit class MyActivity : Activity { override fun onCreate(state: Bundle?) { super.onCreate(state) lifecycleScope.launch { // Run } lifecycleScope.launchWhenResumed { // Run } } } Activities & Fragments lifecycleScope.launchWhenResumed { // Run }
82. #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 } } }
83. #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
84. #AndroidDevSummit After lifecycle 2.2 Multiple values with LiveData
85. #AndroidDevSummit After lifecycle 2.2 Streams with Flow
86. emit N Values val currentWeather: LiveData<String> = dataSource.fetchWeather() LiveData → LiveData Flow → LiveData val currentWeatherFlow: LiveData<String> = liveData { dataSource.fetchWeatherFlow().collect { emit(it) } }
87. emit N Values LiveData → LiveData Flow → LiveData val currentWeather: LiveData<String> = dataSource.fetchWeather() val currentWeatherFlow: LiveData<String> = dataSource.fetchWeatherFlow().asLiveData()
88. 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() ) }
89. 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()
90. Transformation val currentWeather: LiveData<String> = dataSource.fetchWeather().map { // Run } LiveData → LiveData
91. Suspend transformation val currentWeather: LiveData<String> = dataSource.fetchWeather().switchMap { liveData { emit(heavyTransformation(it)) } } LiveData → LiveData
92. 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
93. #AndroidDevSummit
94. CameraX - 1.0.0-alpha06 (Alpha)
95. Android Dev Summit Focus +{API} HDR Capabilities Stability Extension
96. #AndroidDevSummit +{API} New Capabilities • Tap to focus • Zoom control • Device rotation info • Flash availability • And a lot more!
97. #AndroidDevSummit Focus Pinch Zoom Zoom Slider
98. #AndroidDevSummit
99. #AndroidDevSummit HDR Extensions • Expanding footprint with additional manufactures • Two lines of code enables Extensions across all of them!
100. #AndroidDevSummit
101. #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(...)
102. 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()
103. #AndroidDevSummit Beta 2019֙ 12ਘ ৘੿!! • Stable API • Higher code quality • Read for production
104. #AndroidDevSummit
105. Release - ConstraintLayout 2.0.0-beta3 - 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) Source : 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 https://github.com/android/performance-samples/blob/master/BenchmarkSample/benchmark/ src/androidTest/java/com/example/benchmark/RecyclerViewBenchmark.kt
117. 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
118. @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
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 @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 Without Time runWithTimingDisabled(…)
125. RecyclerView Benchmark
126. Migration to AndroidX
127. CardView vs CardView Support (28.0.0-alpha01) AndroidX (1.0.0) 45 Removals, 44 Additions - JavaDoc : 38 lines - Package/Import : 5 lines - Empty Line : 1 lines Package name݅ ׮ܴ
128. Fragment 28.0.0-alpha01 vs 1.2.0-rc01 419 Removals, 746 Additions
129. җѢ ߡ੹җ੄ ࠺Ү ഝߊೞѱ সؘ੉౟о ੌযաח Component੄ ӝמ਷ ௼ѱ ର੉դ׮.
130. I/O '18 Announce Migration Support Library => AndroidX
131. https://developer.android.com/topic/libraries/support-library/revisions
132. Better package management ؕ஖ ௾ Library ܻ࠙ => ؊ ࡅܲ ܾܻૉ - Google Play Services - Firebase - ButterKnife - Mockito2 - SQL Delight - New libraries
133. FIRST backup backup backup backup backup backup backup backup backup backup backup backup backup backup backup backup backup backup backup backup backup backup backup backup backup backup backup backup backup backup
134. #AndroidDevSummit
135. Not Support Code generation libraries
136. Migration • Menu Bar Refactor > Migrate to AndroidX ࢶఖ • External Librariesী AndroidX ޷֢୹द Opt 1. Gradle Sync Opt 2. Invalidate Caches / Restart • 100% ߸ജ੉ উؼ ࣻ ੓ਵ޲۽ ѐੋ੸ਵ۽ ࣻز੉ উ੿੸
137. Targeting API level 28 or lower dependencies { ... implementation 'com.android.support:appcompat-v7:28.0.0' implementation 'android.arch.lifecycle:extensions:1.1.1' ... }
138. Jetifier Disable Jetifier = false / AndroidX = true
139. Targeting API level 29+ dependencies { ... implementation 'com.android.support:appcompat-v7:28.0.0' implementation 'android.arch.lifecycle:extensions:1.1.1' ... }
140. gradle.properties # AndroidX package structure to make it clearer which packages are bundled with the # Android operating system, and which are packaged with your app's APK android.useAndroidX=true # Automatically convert third-party libraries to use AndroidX android.enableJetifier=tru https://developer.android.com/studio/command-line/jetifier
141. Jetifier Disable Jetifier Enable AppCompat
142. Jetifier Disable Jetifier Enable 3rd-party Library
143. Jetifier AndroidX ಁః૑ܳ ࢎਊೡ ࣻ ੓ب۾ Support Libraryܳ ݃੉Ӓۨ੉࣌ Migration ߑߨ • Android Studio ղ੄ Bundle۽ ػ Plugin ࢎਊ • ૒੽ ݃੉Ӓۨ੉࣌ https://developer.android.com/studio/command-line/jetifier
144. Jetifier Transform-Rule https://android.googlesource.com/platform/frameworks/support/+/androidx- master-dev/jetifier/jetifier/core/src/main/resources/default.config default.config ౵ੌ ղࠗী ࢎ੹ ੿੄ ػ Migration Rule
145. Not Support - Version configuration files - Proguard files
146. Migration to AndroidX • Support Libraryח Deprecate • ঱ઃо ೧ঠೡ ੘স਷ ؊ ੉࢚ ইפ׮ • Release Android 10 (2019.09.03) • ࢲ࠺झ੄ ઱ਃ ױ݈੄ Android 10 সؘ੉౟ दӝ ୓௼
147. #AndroidDevSummit goo.gle/plaid-androidx-migration
148. 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
149. Watch the talks and learn more! Android Dev Summit 2019
150. Watch the talks and learn more! Android Dev Summit 2019 END