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
   

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2. FragmentContainer.getFragment
   

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3. android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:name="dev.androidbroadcast.fragmentdemo.FirstFragment"
   android:tag="first"
   !"
   

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4. android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:name="dev.androidbroadcast.fragmentdemo.FirstFragment"
   android:tag="first"
   !"
   

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5. val fragment = supportFragmentManager.findFragmentById(R.id.fragment_container)
   val homeFragment: HomeFragment = fragment as HomeFragment
   

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6. val fragmentContainer: FragmentContainerView = …
   val homeFragment: HomeFragment = fragmentContainer.getFragment()
   

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7. Новый менеджер состояний
   теперь единственный
   

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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]
   

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11. FragmentStrictMode
    

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12. supportFragmentManager.strictModePolicy =
    FragmentStrictMode.Policy.Builder()
    .penaltyDeath()
    .penaltyListener(…)
    .penaltyLog()
    .detectFragmentReuse()
    .detectFragmentTagUsage()
    .detectRetainInstanceUsage()
    .detectTargetFragmentUsage()
    .detectWrongFragmentContainer()
    .detectSetUserVisibleHint()
    .build()
    

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13. supportFragmentManager.strictModePolicy =
    FragmentStrictMode.Policy.Builder()
    .penaltyDeath()
    .penaltyListener(…)
    .penaltyLog()
    .detectFragmentReuse()
    .detectFragmentTagUsage()
    .detectRetainInstanceUsage()
    .detectTargetFragmentUsage()
    .detectWrongFragmentContainer()
    .detectSetUserVisibleHint()
    .build()
    

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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)
    

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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)
    

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16. penaltyListener
    FragmentStrictMode.Policy.Builder()
    .penaltyListener() { vialotation: Violation !"
    }
    

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17. penaltyListener
    FragmentStrictMode.Policy.Builder()
    .penaltyListener() { vialotation: Violation !"
    }
    Firebase.crashlytics.recordException(vialotation)
    

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18. supportFragmentManager.strictModePolicy =
    FragmentStrictMode.Policy.Builder()
    .penaltyDeath()
    .penaltyListener(…)
    .penaltyLog()
    .detectFragmentReuse()
    .detectFragmentTagUsage()
    .detectRetainInstanceUsage()
    .detectTargetFragmentUsage()
    .detectWrongFragmentContainer()
    .detectSetUserVisibleHint()
    .build()
    

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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)
    }
    

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20. detectFragmentTagUsage
    !" Использование тэга при добавление Fragment в XML
    android:name="dev.androidbroadcast.fragmentdemo.FirstFragment"
    android:tag="first"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    !"
    

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21. detectWrongFragmentContainer
    !" Неправильный layout-контейнер для Fragment
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:name="dev.androidbroadcast.fragmentdemo.FirstFragment"
    android:tag="first"
    !"
    

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22. detectWrongFragmentContainer
    !# Правильный layout-контейнер для Fragment
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:name="dev.androidbroadcast.fragmentdemo.FirstFragment"
    android:tag="first"
    !"
    

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23. detectSetUserVisibleHint
    !" userVisibleHint уже deprecated
    fragment.userVisibleHint = false
    

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24. detectRetainInstanceUsage
    !" retainInstance уже deprecated
    fragment.retainInstance = true
    if (fragment.retainInstance) {
    !!@
    }
    

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25. detectTargetFragmentUsage
    !" setTargetFragment уже deprecated
    firstFragment.setTargetFragment(secondFragment, FRAGMENT_REEQUEST_CODE)
    

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26. Fragment Result API
    class FirstFragment : Fragment() {
    parentFragmentManager.setFragmentResultListener(
    FRAGMENT_REQUEST_KEY,
    viewLifecycleOwner
    ) { requestKey: String, result: Bundle !"
    }
    }
    

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27. Множественный Back Stack
    

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28. Добавление Fragment в Back Stack
    Back Stack
    

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29. Добавление Fragment в Back Stack
    supportFragmentManager.commit {
    replace(
    R.id.fragment_container,
    homeFragment,
    FRAGMENT_TAG_HOME
    )
    addToBackStack(null)
    }
    Back Stack
    HomeFragment
    

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30. SavedState
    Back Stack
    

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31. !" Добавляем начальный Fragment
    supportFragmentManager.commit {
    setReorderingAllowed(true)
    replace(R.id.fragment_container)
    }
    SavedState
    Back Stack
    HomeFragment
    

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32. SavedState
    Back Stack
    HomeFragment
    

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33. supportFragmentManager.commit {
    setReorderingAllowed(true)
    replace(R.id.fragment_container)
    addToBackStack("profile")
    }
    SavedState
    Back Stack
    HomeFragment
    ProZleFragment
    EditProZleFragment
    supportFragmentManager.commit {
    setReorderingAllowed(true)
    replace(R.id.fragment_container)
    addToBackStack("profile")
    }
    

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34. SavedState
    Back Stack
    HomeFragment
    ProZleFragment
    EditProZleFragment
    

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35. SavedState
    proZle
    Back Stack
    HomeFragment
    ProZleFragment
    EditProZleFragment
    supportFragmentManager.saveBackStack("profile")
    

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36. NotiZcationsFragment
    SavedState
    proZle
    Back Stack
    HomeFragment
    ProZleFragment
    EditProZleFragment
    supportFragmentManager.saveBackStack("profile")
    supportFragmentManager.commit {
    setReorderingAllowed(true)
    replace(R.id.fragment_container)
    addToBackStack("notifications")
    }
    

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37. SavedState
    proZle
    Back Stack
    HomeFragment
    ProZleFragment
    EditProZleFragment
    NotiZcationsFragment
    

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38. SavedState
    proZle
    supportFragmentManager.saveBackStack("notifications")
    Back Stack
    HomeFragment
    ProZleFragment
    EditProZleFragment
    notiZcations
    NotiZcationsFragment
    

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39. SavedState
    supportFragmentManager.saveBackStack("notifications")
    Back Stack
    HomeFragment
    ProZleFragment
    EditProZleFragment
    notiZcations
    NotiZcationsFragment
    supportFragmentManager.restoreBackStack("profile")
    

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40. SavedState
    Back Stack
    HomeFragment
    ProZleFragment
    EditProZleFragment
    notiZcations
    NotiZcationsFragment
    

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41. SavedState
    supportFragmentManager.clearBackStack("notifications")
    Back Stack
    HomeFragment
    ProZleFragment
    EditProZleFragment
    

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43. Новые Android Lint проверки
    

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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
    

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