Что нового в Fragment 1.4

Видео версия https://youtu.be/UWuuqbNIWpE

Крайний релиз Jetpack Fragment вышел очень интересным на фичи, что заслужил озвучить изменения в отдельном видео, а именно:
🔥 Новый менеджер состояний
🔥 Несколько back stack
🔥 FragmentStrictMode
💪 Новые проверки кода в Android Lint
🚀 Улучшение работы анимаций
🔨 Исправление багов в работе ЖЦ Fragment

Transcript

1. Fragment 1.4 Кирилл Розов, Android Broadcast, декабрь 2021 Как похорошели Fragment
2. FragmentContainer.getFragment
3. <fragment android:layout_width="match_parent" android:layout_height="match_parent" android:name="dev.androidbroadcast.fragmentdemo.FirstFragment" android:tag="first" !"
4. <androidx.fragment.app.FragmentContainerView android:layout_width="match_parent" android:layout_height="match_parent" android:name="dev.androidbroadcast.fragmentdemo.FirstFragment" android:tag="first" !"
5. val fragment = supportFragmentManager.findFragmentById(R.id.fragment_container) val homeFragment: HomeFragment = fragment as HomeFragment
6. val fragmentContainer: FragmentContainerView = … val homeFragment: HomeFragment = fragmentContainer.getFragment()
7. Новый менеджер состояний теперь единственный
8. Что изменили ! Исправили множество багов с навигацией ! Управление состоянием Fragment ! Заложена поддержка для множественного back stack ! Упрощение жизненного цикла Fragment [результатов пока не видно]
11. FragmentStrictMode
12. supportFragmentManager.strictModePolicy = FragmentStrictMode.Policy.Builder() .penaltyDeath() .penaltyListener(…) .penaltyLog() .detectFragmentReuse() .detectFragmentTagUsage() .detectRetainInstanceUsage() .detectTargetFragmentUsage() .detectWrongFragmentContainer() .detectSetUserVisibleHint() .build()
13. supportFragmentManager.strictModePolicy = FragmentStrictMode.Policy.Builder() .penaltyDeath() .penaltyListener(…) .penaltyLog() .detectFragmentReuse() .detectFragmentTagUsage() .detectRetainInstanceUsage() .detectTargetFragmentUsage() .detectWrongFragmentContainer() .detectSetUserVisibleHint() .build()
14. penaltyDeath 2021-12-11 17:08:56.170 12010-12010/dev.androidbroadcast.fragmentdemo E/FragmentStrictMode: Policy violation with PENALTY_DEATH in dev.androidbroadcast.fragmentdemo.FirstFragment androidx.fragment.app.strictmode.SetUserVisibleHintViolation: Attempting to set user visible hint to true for fragment FirstFragment{300fd8d} (9fbf6047-2ed5-4952-b7bd-4d513035c141 id=0x7f0800c5) at androidx.fragment.app.strictmode.FragmentStrictMode.onSetUserVisibleHint(FragmentStrictMode.kt:131) at androidx.fragment.app.Fragment.setUserVisibleHint(Fragment.java:1335) at dev.androidbroadcast.fragmentdemo.FirstFragment.onViewCreated(FirstFragment.kt:26) at androidx.fragment.app.Fragment.performViewCreated(Fragment.java:3019) at androidx.fragment.app.FragmentStateManager.createView(FragmentStateManager.java:551) at androidx.fragment.app.FragmentStateManager.moveToExpectedState(FragmentStateManager.java:261) at androidx.fragment.app.FragmentStore.moveToExpectedState(FragmentStore.java:113) at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1374) at androidx.fragment.app.FragmentManager.dispatchStateChange(FragmentManager.java:2841) at androidx.fragment.app.FragmentManager.dispatchViewCreated(FragmentManager.java:2777) at androidx.fragment.app.Fragment.performViewCreated(Fragment.java:3020) at androidx.fragment.app.FragmentStateManager.createView(FragmentStateManager.java:551) at androidx.fragment.app.FragmentStateManager.moveToExpectedState(FragmentStateManager.java:261) at androidx.fragment.app.FragmentStore.moveToExpectedState(FragmentStore.java:113) at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1374) at androidx.fragment.app.FragmentManager.dispatchStateChange(FragmentManager.java:2841) at androidx.fragment.app.FragmentManager.dispatchActivityCreated(FragmentManager.java:2784) at androidx.fragment.app.FragmentController.dispatchActivityCreated(FragmentController.java:262) at androidx.fragment.app.FragmentActivity.onStart(FragmentActivity.java:478) at androidx.appcompat.app.AppCompatActivity.onStart(AppCompatActivity.java:246)
15. penaltyLog 2021-12-11 17:10:19.516 12163-12163/dev.androidbroadcast.fragmentdemo D/FragmentStrictMode: Policy violation in dev.androidbroadcast.fragmentdemo.FirstFragment androidx.fragment.app.strictmode.SetUserVisibleHintViolation: Attempting to set user visible hint to true for fragment FirstFragment{300fd8d} (e2010f02-eb83-416b-a7ac-05aaa3befd12 id=0x7f0800c5) at androidx.fragment.app.strictmode.FragmentStrictMode.onSetUserVisibleHint(FragmentStrictMode.kt:131) at androidx.fragment.app.Fragment.setUserVisibleHint(Fragment.java:1335) at dev.androidbroadcast.fragmentdemo.FirstFragment.onViewCreated(FirstFragment.kt:26) at androidx.fragment.app.Fragment.performViewCreated(Fragment.java:3019) at androidx.fragment.app.FragmentStateManager.createView(FragmentStateManager.java:551) at androidx.fragment.app.FragmentStateManager.moveToExpectedState(FragmentStateManager.java:261) at androidx.fragment.app.FragmentStore.moveToExpectedState(FragmentStore.java:113) at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1374) at androidx.fragment.app.FragmentManager.dispatchStateChange(FragmentManager.java:2841) at androidx.fragment.app.FragmentManager.dispatchViewCreated(FragmentManager.java:2777) at androidx.fragment.app.Fragment.performViewCreated(Fragment.java:3020) at androidx.fragment.app.FragmentStateManager.createView(FragmentStateManager.java:551) at androidx.fragment.app.FragmentStateManager.moveToExpectedState(FragmentStateManager.java:261) at androidx.fragment.app.FragmentStore.moveToExpectedState(FragmentStore.java:113) at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1374) at androidx.fragment.app.FragmentManager.dispatchStateChange(FragmentManager.java:2841) at androidx.fragment.app.FragmentManager.dispatchActivityCreated(FragmentManager.java:2784) at androidx.fragment.app.FragmentController.dispatchActivityCreated(FragmentController.java:262) at androidx.fragment.app.FragmentActivity.onStart(FragmentActivity.java:478) at androidx.appcompat.app.AppCompatActivity.onStart(AppCompatActivity.java:246)
16. penaltyListener FragmentStrictMode.Policy.Builder() .penaltyListener() { vialotation: Violation !" }
17. penaltyListener FragmentStrictMode.Policy.Builder() .penaltyListener() { vialotation: Violation !" } Firebase.crashlytics.recordException(vialotation)
18. supportFragmentManager.strictModePolicy = FragmentStrictMode.Policy.Builder() .penaltyDeath() .penaltyListener(…) .penaltyLog() .detectFragmentReuse() .detectFragmentTagUsage() .detectRetainInstanceUsage() .detectTargetFragmentUsage() .detectWrongFragmentContainer() .detectSetUserVisibleHint() .build()
19. detectFragmentReuse !" Повторное использование Fragment, который был удален из FragmentManager val firstFragment = fragmentManager.findFragmentByTag(FRAGMENT_TAG_FIRST) !7 return fragmentManager.commit { remove(firstFragment) } fragmentManager.commit { !" Добавление Fragment, удалённого ранее add(R.id.fragment_container, firstFragment, FRAGMENT_TAG_FIRST) }
20. detectFragmentTagUsage !" Использование тэга при добавление Fragment в XML <fragment android:name="dev.androidbroadcast.fragmentdemo.FirstFragment" android:tag="first" android:layout_width="match_parent" android:layout_height="match_parent" !"
21. detectWrongFragmentContainer !" Неправильный layout-контейнер для Fragment <FrameLayout android:layout_width="match_parent" android:layout_height="match_parent" android:name="dev.androidbroadcast.fragmentdemo.FirstFragment" android:tag="first" !"
22. detectWrongFragmentContainer !# Правильный layout-контейнер для Fragment <androidx.fragment.app.FragmentContainerView android:layout_width="match_parent" android:layout_height="match_parent" android:name="dev.androidbroadcast.fragmentdemo.FirstFragment" android:tag="first" !"
23. detectSetUserVisibleHint !" userVisibleHint уже deprecated fragment.userVisibleHint = false
24. detectRetainInstanceUsage !" retainInstance уже deprecated fragment.retainInstance = true if (fragment.retainInstance) { !!@ }
25. detectTargetFragmentUsage !" setTargetFragment уже deprecated firstFragment.setTargetFragment(secondFragment, FRAGMENT_REEQUEST_CODE)
26. Fragment Result API class FirstFragment : Fragment() { parentFragmentManager.setFragmentResultListener( FRAGMENT_REQUEST_KEY, viewLifecycleOwner ) { requestKey: String, result: Bundle !" } }
27. Множественный Back Stack
28. Добавление Fragment в Back Stack Back Stack
29. Добавление Fragment в Back Stack supportFragmentManager.commit { replace( R.id.fragment_container, homeFragment, FRAGMENT_TAG_HOME ) addToBackStack(null) } Back Stack HomeFragment
30. SavedState Back Stack
31. !" Добавляем начальный Fragment supportFragmentManager.commit { setReorderingAllowed(true) replace<HomeFragment>(R.id.fragment_container) } SavedState Back Stack HomeFragment
32. SavedState Back Stack HomeFragment
33. supportFragmentManager.commit { setReorderingAllowed(true) replace<ProfileFragment>(R.id.fragment_container) addToBackStack("profile") } SavedState Back Stack HomeFragment ProZleFragment EditProZleFragment supportFragmentManager.commit { setReorderingAllowed(true) replace<EditProfileFragment>(R.id.fragment_container) addToBackStack("profile") }
34. SavedState Back Stack HomeFragment ProZleFragment EditProZleFragment
35. SavedState proZle Back Stack HomeFragment ProZleFragment EditProZleFragment supportFragmentManager.saveBackStack("profile")
36. NotiZcationsFragment SavedState proZle Back Stack HomeFragment ProZleFragment EditProZleFragment supportFragmentManager.saveBackStack("profile") supportFragmentManager.commit { setReorderingAllowed(true) replace<NotificationsFragment>(R.id.fragment_container) addToBackStack("notifications") }
37. SavedState proZle Back Stack HomeFragment ProZleFragment EditProZleFragment NotiZcationsFragment
38. SavedState proZle supportFragmentManager.saveBackStack("notifications") Back Stack HomeFragment ProZleFragment EditProZleFragment notiZcations NotiZcationsFragment
39. SavedState supportFragmentManager.saveBackStack("notifications") Back Stack HomeFragment ProZleFragment EditProZleFragment notiZcations NotiZcationsFragment supportFragmentManager.restoreBackStack("profile")
40. SavedState Back Stack HomeFragment ProZleFragment EditProZleFragment notiZcations NotiZcationsFragment
41. SavedState supportFragmentManager.clearBackStack("notifications") Back Stack HomeFragment ProZleFragment EditProZleFragment
43. Новые Android Lint проверки
44. Новые проверки в Android Lint ! UseGetLayoutInflater Использование неправильного LayoutInflater в DialogFragment ! DialogFragmentCallbacksDetector Переопределение callback у Dialog, а не DialogFragment ! FragmentAddMenuProvider Использование неверного Lifecycle при использовании addMenuProvider ! DetachAndAttachFragmentInSameFragmentTransaction Выполнение attach и detach для одного и того же Fragment в рамках одной транзакции