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July 01, 2022

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Transcript

  1. Hiroyuki Mori @moridroid BottomNavigationView for humankind

  2. ↓This

  3. making a new app

  4. making a new app - multi-module project

  5. making a new app - multi-module project - Jetpack Navigation

  6. making a new app - multi-module project - Jetpack Navigation

    - BottomNavigationView

  7. making a new app - multi-module project - Jetpack Navigation

    - BottomNavigationView →

  8. making a new app - multi-module project - Jetpack Navigation

    - BottomNavigationView →

  9. No support for Multiple Backstack

  10. https://bit.ly/3wXjGLy

  11. Click

  12. None

  13. Click

  14. None

  15. Click QUIZ： When the Home menu is clicked, which screen

    is displayed? 1. Welcome 2. About
  16. None

  17. disappear go down

  18. No!

  19. Behavior Changed support multiple backstack from Fragment 1.4.0-alpha01 NavigationUI 2.4.0-alpha01

  20. Just update dependencies

  21. This isn’t nice

  22. Click

  23. Click

  24. Click

  25. None

  26. This isn’t nice

  27. This isn’t nice

  28. QUIZ： If you click the back key, which screen is

    displayed? 1. Welcome 2. About Click

  29. QUIZ： If you click the back key, which screen is

    displayed? 1. Welcome 2. About Click ？

  30. QUIZ： If you click the back key, which screen is

    displayed? 1. Welcome 2. About Click ✕
  31. None

  32. Click

  33. None

  34. How Multiple backstack works

  35. Backstack　　 SavedState　　

  36. Backstack　　 SavedState　　 Click

  37. Backstack　　 SavedState　　 menu A　 Save Backstack　　 SavedState　　 Click

  38. Backstack　　 SavedState　　 menu A　 Click

  39. Backstack　　 SavedState　　 menu B　 menu A　 Restore Save Click

  40. Backstack　　 SavedState　　 menu A　 menu B　 ← When the back

    key is pressed ← Can’t decide 　which should be restored

  41. Backstack　　 SavedState　　 menu A　 menu B　 ← New Instance Backstack　　

    SavedState　　 menu A　 menu B　

  42. Backstack　　 SavedState　　 menu A　 menu B　 menu A　 menu B　

    Click

  43. menu B　 menu A　 Backstack　　 SavedState　　 menu B　 Backstack　　 SavedState　　

  44. graph A1 B1 C1 D1 B2 B3 C2 C3 D2

    D3 C4 C5

  45. graph A1 B1 C1 D1 B2 B3 C2 C3 D2

    D3 C4 C5

  46. graph A1 B1 C1 D1 B2 B3 C2 C3 D2

    D3 C4 C5

  47. graph A1 B1 C1 D1 B2 B3 C2 C3 D2

    D3 C4 C5

  48. graph A1 B1 C1 D1 B2 B3 C2 C3 D2

    D3 C4 C5

  49. graph A1 B1 C1 D1 B2 B3 C2 C3 D2

    D3 C4 C5

  50. What the ideal Bottom Navigation should be

  51. None
  52. None

  53. C1

  54. C1 C2

  55. C1 C2 C3

  56. C1 C2 C3 D1 Click menu D

  57. C1 C2 C3 D1 D2 Click menu D

  58. C1 C2 C3 D1 D2 Click menu D Click menu

    C

  59. C1 C2 C3 D1 D2 Click menu D Click menu

    C Then, the back key will navigate… ① ② ③ ④ ⑤ ⑥ C3 C3 C2 D2 D1 C3 C2 C1 C1 D2 D1 ⑥ ⑤ ④ ③ ② ① ② ③ ① ⑤ ④

  60. How to implement Backstack management

  61. https://bit.ly/3zdDxrn

  62. First of all: Reorderable Stack

  63. class NavStack @Inject constructor(){ data class NavRecord(val screenId: Int, val

    menuId: Int) private val selectedMenu = MutableStateFlow(R.id.none) fun push(screenId: Int, menuId: Int) { ... } fun pop(): NavRecord? { ... } fun peekAt(index: Int) : NavRecord? { ... } val size: Int get() { … } fun findByMenuId(menuId: Int): List<NavRecord> { ... } fun moveToTop(menuId: Int) { ... } fun removeAll(menuId: Int) { ... } }

  64. • Navigate • Switch menu • Go Back

  65. Navigate Switch menu Go Back if (currentMenuId == nextMenuId) {

    stack.push(screenId, currentMenuId) fragmentManager.replace(currentMenuId, nextScreen.clazz, arguments) } else { stack.moveToTop(nextMenuId) stack.push(screenId, nextMenuId) fragmentManager.saveBackStack(currentMenuId.toString()) fragmentManager.restoreBackStack(nextMenuId.toString()) fragmentManager.replace(nextMenuId, nextScreen.clazz, arguments) }

  66. Navigate case 1: within the same menu if (currentMenuId ==

    nextMenuId) { stack.push(screenId, currentMenuId) fragmentManager.replace(currentMenuId, nextScreen.clazz, arguments) } else { stack.moveToTop(nextMenuId) stack.push(screenId, nextMenuId) fragmentManager.saveBackStack(currentMenuId.toString()) fragmentManager.restoreBackStack(nextMenuId.toString()) fragmentManager.replace(nextMenuId, nextScreen.clazz, arguments) }

  67. if (currentMenuId == nextMenuId) { stack.push(screenId, currentMenuId) fragmentManager.replace(currentMenuId, nextScreen.clazz, arguments)

    } else { stack.moveToTop(nextMenuId) stack.push(screenId, nextMenuId) fragmentManager.saveBackStack(currentMenuId.toString()) fragmentManager.restoreBackStack(nextMenuId.toString()) fragmentManager.replace(nextMenuId, nextScreen.clazz, arguments) } Navigate case 2: across menus

  68. Navigate case 1: within the same menu if (currentMenuId ==

    nextMenuId) { stack.push(screenId, currentMenuId) fragmentManager.replace(currentMenuId, nextScreen.clazz, arguments) } else { stack.moveToTop(nextMenuId) stack.push(screenId, nextMenuId) fragmentManager.saveBackStack(currentMenuId.toString()) fragmentManager.restoreBackStack(nextMenuId.toString()) fragmentManager.replace(nextMenuId, nextScreen.clazz, arguments) }

  69. Navigate case 1: within the same menu if (currentMenuId ==

    nextMenuId) { stack.push(screenId, currentMenuId) fragmentManager.replace(currentMenuId, nextScreen.clazz, arguments) } else { stack.moveToTop(nextMenuId) stack.push(screenId, nextMenuId) fragmentManager.saveBackStack(currentMenuId.toString()) fragmentManager.restoreBackStack(nextMenuId.toString()) fragmentManager.replace(nextMenuId, nextScreen.clazz, arguments) }

  70. Navigate case 1: within the same menu if (currentMenuId ==

    nextMenuId) { stack.push(screenId, currentMenuId) fragmentManager.replace(currentMenuId, nextScreen.clazz, arguments) } else { stack.moveToTop(nextMenuId) stack.push(screenId, nextMenuId) fragmentManager.saveBackStack(currentMenuId.toString()) fragmentManager.restoreBackStack(nextMenuId.toString()) fragmentManager.replace(nextMenuId, nextScreen.clazz, arguments) } fragmentManager.commit { setReorderingAllowed(true) replace(requireNotNull(containerId), clazz.newInstance().apply { arguments = args }) addToBackStack(menuId.toString()) }

  71. Navigate case 1: within the same menu if (currentMenuId ==

    nextMenuId) { stack.push(screenId, currentMenuId) fragmentManager.replace(currentMenuId, nextScreen.clazz, arguments) } else { stack.moveToTop(nextMenuId) stack.push(screenId, nextMenuId) fragmentManager.saveBackStack(currentMenuId.toString()) fragmentManager.restoreBackStack(nextMenuId.toString()) fragmentManager.replace(nextMenuId, nextScreen.clazz, arguments) } fragmentManager.commit { setReorderingAllowed(true) replace(requireNotNull(containerId), clazz.newInstance().apply { arguments = args }) addToBackStack(menuId.toString()) }

  72. if (currentMenuId == nextMenuId) { stack.push(screenId, currentMenuId) fragmentManager.replace(currentMenuId, nextScreen.clazz, arguments)

    } else { stack.moveToTop(nextMenuId) stack.push(screenId, nextMenuId) fragmentManager.saveBackStack(currentMenuId.toString()) fragmentManager.restoreBackStack(nextMenuId.toString()) fragmentManager.replace(nextMenuId, nextScreen.clazz, arguments) } Navigate case 2: across menus

  73. if (currentMenuId == nextMenuId) { stack.push(screenId, currentMenuId) fragmentManager.replace(currentMenuId, nextScreen.clazz, arguments)

    } else { stack.moveToTop(nextMenuId) stack.push(screenId, nextMenuId) fragmentManager.saveBackStack(currentMenuId.toString()) fragmentManager.restoreBackStack(nextMenuId.toString()) fragmentManager.replace(nextMenuId, nextScreen.clazz, arguments) } Navigate case 2: across menus

  74. if (currentMenuId == nextMenuId) { stack.push(screenId, currentMenuId) fragmentManager.replace(currentMenuId, nextScreen.clazz, arguments)

    } else { stack.moveToTop(nextMenuId) stack.push(screenId, nextMenuId) fragmentManager.saveBackStack(currentMenuId.toString()) fragmentManager.restoreBackStack(nextMenuId.toString()) fragmentManager.replace(nextMenuId, nextScreen.clazz, arguments) } Navigate case 2: across menus

  75. if (currentMenuId == nextMenuId) { stack.push(screenId, currentMenuId) fragmentManager.replace(currentMenuId, nextScreen.clazz, arguments)

    } else { stack.moveToTop(nextMenuId) stack.push(screenId, nextMenuId) fragmentManager.saveBackStack(currentMenuId.toString()) fragmentManager.restoreBackStack(nextMenuId.toString()) fragmentManager.replace(nextMenuId, nextScreen.clazz, arguments) } Navigate case 2: across menus

  76. Navigate Switch menu Go Back when { currentMenu.menuId == nextMenu.menuId

    -> { stack.removeAll(currentMenu.menuId) stack.push(startScreen.screenId, nextMenu.menuId) fragmentManager.clearBackStack(nextMenu.menuId.toString()) fragmentManager.replace(nextMenu.menuId, startScreen.clazz) } stack.findByMenuId(nextMenu.menuId).isEmpty() -> { stack.push(startScreen.screenId, nextMenu.menuId) fragmentManager.saveBackStack(currentMenu.menuId.toString()) fragmentManager.replace(nextMenu.menuId, startScreen.clazz) } else -> { stack.moveToTop(nextMenu.menuId) fragmentManager.saveBackStack(currentMenu.menuId.toString()) fragmentManager.restoreBackStack(nextMenu.menuId.toString()) } }

  77. Switch Menu case 1: re-select menu when { currentMenu.menuId ==

    nextMenu.menuId -> { stack.removeAll(currentMenu.menuId) stack.push(startScreen.screenId, nextMenu.menuId) fragmentManager.clearBackStack(nextMenu.menuId.toString()) fragmentManager.replace(nextMenu.menuId, startScreen.clazz) } stack.findByMenuId(nextMenu.menuId).isEmpty() -> { stack.push(startScreen.screenId, nextMenu.menuId) fragmentManager.saveBackStack(currentMenu.menuId.toString()) fragmentManager.replace(nextMenu.menuId, startScreen.clazz) } else -> { stack.moveToTop(nextMenu.menuId) fragmentManager.saveBackStack(currentMenu.menuId.toString()) fragmentManager.restoreBackStack(nextMenu.menuId.toString()) } }

  78. Switch Menu case 2: has no records when { currentMenu.menuId

    == nextMenu.menuId -> { stack.removeAll(currentMenu.menuId) stack.push(startScreen.screenId, nextMenu.menuId) fragmentManager.clearBackStack(nextMenu.menuId.toString()) fragmentManager.replace(nextMenu.menuId, startScreen.clazz) } stack.findByMenuId(nextMenu.menuId).isEmpty() -> { stack.push(startScreen.screenId, nextMenu.menuId) fragmentManager.saveBackStack(currentMenu.menuId.toString()) fragmentManager.replace(nextMenu.menuId, startScreen.clazz) } else -> { stack.moveToTop(nextMenu.menuId) fragmentManager.saveBackStack(currentMenu.menuId.toString()) fragmentManager.restoreBackStack(nextMenu.menuId.toString()) } }

  79. Switch Menu case 3: click the same menu when {

    currentMenu.menuId == nextMenu.menuId -> { stack.removeAll(currentMenu.menuId) stack.push(startScreen.screenId, nextMenu.menuId) fragmentManager.clearBackStack(nextMenu.menuId.toString()) fragmentManager.replace(nextMenu.menuId, startScreen.clazz) } stack.findByMenuId(nextMenu.menuId).isEmpty() -> { stack.push(startScreen.screenId, nextMenu.menuId) fragmentManager.saveBackStack(currentMenu.menuId.toString()) fragmentManager.replace(nextMenu.menuId, startScreen.clazz) } else -> { stack.moveToTop(nextMenu.menuId) fragmentManager.saveBackStack(currentMenu.menuId.toString()) fragmentManager.restoreBackStack(nextMenu.menuId.toString()) } }

  80. Switch Menu case 1: re-select menu when { currentMenu.menuId ==

    nextMenu.menuId -> { stack.removeAll(currentMenu.menuId) stack.push(startScreen.screenId, nextMenu.menuId) fragmentManager.clearBackStack(nextMenu.menuId.toString()) fragmentManager.replace(nextMenu.menuId, startScreen.clazz) } stack.findByMenuId(nextMenu.menuId).isEmpty() -> { stack.push(startScreen.screenId, nextMenu.menuId) fragmentManager.saveBackStack(currentMenu.menuId.toString()) fragmentManager.replace(nextMenu.menuId, startScreen.clazz) } else -> { stack.moveToTop(nextMenu.menuId) fragmentManager.saveBackStack(currentMenu.menuId.toString()) fragmentManager.restoreBackStack(nextMenu.menuId.toString()) } }

  81. Switch Menu case 1: re-select menu when { currentMenu.menuId ==

    nextMenu.menuId -> { stack.removeAll(currentMenu.menuId) stack.push(startScreen.screenId, nextMenu.menuId) fragmentManager.clearBackStack(nextMenu.menuId.toString()) fragmentManager.replace(nextMenu.menuId, startScreen.clazz) } stack.findByMenuId(nextMenu.menuId).isEmpty() -> { stack.push(startScreen.screenId, nextMenu.menuId) fragmentManager.saveBackStack(currentMenu.menuId.toString()) fragmentManager.replace(nextMenu.menuId, startScreen.clazz) } else -> { stack.moveToTop(nextMenu.menuId) fragmentManager.saveBackStack(currentMenu.menuId.toString()) fragmentManager.restoreBackStack(nextMenu.menuId.toString()) } }

  82. Switch Menu case 1: re-select menu when { currentMenu.menuId ==

    nextMenu.menuId -> { stack.removeAll(currentMenu.menuId) stack.push(startScreen.screenId, nextMenu.menuId) fragmentManager.clearBackStack(nextMenu.menuId.toString()) fragmentManager.replace(nextMenu.menuId, startScreen.clazz) } stack.findByMenuId(nextMenu.menuId).isEmpty() -> { stack.push(startScreen.screenId, nextMenu.menuId) fragmentManager.saveBackStack(currentMenu.menuId.toString()) fragmentManager.replace(nextMenu.menuId, startScreen.clazz) } else -> { stack.moveToTop(nextMenu.menuId) fragmentManager.saveBackStack(currentMenu.menuId.toString()) fragmentManager.restoreBackStack(nextMenu.menuId.toString()) } }

  83. Switch Menu case 2: has no records when { currentMenu.menuId

    == nextMenu.menuId -> { stack.removeAll(currentMenu.menuId) stack.push(startScreen.screenId, nextMenu.menuId) fragmentManager.clearBackStack(nextMenu.menuId.toString()) fragmentManager.replace(nextMenu.menuId, startScreen.clazz) } stack.findByMenuId(nextMenu.menuId).isEmpty() -> { stack.push(startScreen.screenId, nextMenu.menuId) fragmentManager.saveBackStack(currentMenu.menuId.toString()) fragmentManager.replace(nextMenu.menuId, startScreen.clazz) } else -> { stack.moveToTop(nextMenu.menuId) fragmentManager.saveBackStack(currentMenu.menuId.toString()) fragmentManager.restoreBackStack(nextMenu.menuId.toString()) } }

  84. Switch Menu case 2: has no records when { currentMenu.menuId

    == nextMenu.menuId -> { stack.removeAll(currentMenu.menuId) stack.push(startScreen.screenId, nextMenu.menuId) fragmentManager.clearBackStack(nextMenu.menuId.toString()) fragmentManager.replace(nextMenu.menuId, startScreen.clazz) } stack.findByMenuId(nextMenu.menuId).isEmpty() -> { stack.push(startScreen.screenId, nextMenu.menuId) fragmentManager.saveBackStack(currentMenu.menuId.toString()) fragmentManager.replace(nextMenu.menuId, startScreen.clazz) } else -> { stack.moveToTop(nextMenu.menuId) fragmentManager.saveBackStack(currentMenu.menuId.toString()) fragmentManager.restoreBackStack(nextMenu.menuId.toString()) } }

  85. Switch Menu case 2: has no records when { currentMenu.menuId

    == nextMenu.menuId -> { stack.removeAll(currentMenu.menuId) stack.push(startScreen.screenId, nextMenu.menuId) fragmentManager.clearBackStack(nextMenu.menuId.toString()) fragmentManager.replace(nextMenu.menuId, startScreen.clazz) } stack.findByMenuId(nextMenu.menuId).isEmpty() -> { stack.push(startScreen.screenId, nextMenu.menuId) fragmentManager.saveBackStack(currentMenu.menuId.toString()) fragmentManager.replace(nextMenu.menuId, startScreen.clazz) } else -> { stack.moveToTop(nextMenu.menuId) fragmentManager.saveBackStack(currentMenu.menuId.toString()) fragmentManager.restoreBackStack(nextMenu.menuId.toString()) } }

  86. Switch Menu case 3: click the same menu when {

    currentMenu.menuId == nextMenu.menuId -> { stack.removeAll(currentMenu.menuId) stack.push(startScreen.screenId, nextMenu.menuId) fragmentManager.clearBackStack(nextMenu.menuId.toString()) fragmentManager.replace(nextMenu.menuId, startScreen.clazz) } stack.findByMenuId(nextMenu.menuId).isEmpty() -> { stack.push(startScreen.screenId, nextMenu.menuId) fragmentManager.saveBackStack(currentMenu.menuId.toString()) fragmentManager.replace(nextMenu.menuId, startScreen.clazz) } else -> { stack.moveToTop(nextMenu.menuId) fragmentManager.saveBackStack(currentMenu.menuId.toString()) fragmentManager.restoreBackStack(nextMenu.menuId.toString()) } }

  87. Switch Menu case 3: click the same menu when {

    currentMenu.menuId == nextMenu.menuId -> { stack.removeAll(currentMenu.menuId) stack.push(startScreen.screenId, nextMenu.menuId) fragmentManager.clearBackStack(nextMenu.menuId.toString()) fragmentManager.replace(nextMenu.menuId, startScreen.clazz) } stack.findByMenuId(nextMenu.menuId).isEmpty() -> { stack.push(startScreen.screenId, nextMenu.menuId) fragmentManager.saveBackStack(currentMenu.menuId.toString()) fragmentManager.replace(nextMenu.menuId, startScreen.clazz) } else -> { stack.moveToTop(nextMenu.menuId) fragmentManager.saveBackStack(currentMenu.menuId.toString()) fragmentManager.restoreBackStack(nextMenu.menuId.toString()) } }

  88. Switch Menu case 3: click the same menu when {

    currentMenu.menuId == nextMenu.menuId -> { stack.removeAll(currentMenu.menuId) stack.push(startScreen.screenId, nextMenu.menuId) fragmentManager.clearBackStack(nextMenu.menuId.toString()) fragmentManager.replace(nextMenu.menuId, startScreen.clazz) } stack.findByMenuId(nextMenu.menuId).isEmpty() -> { stack.push(startScreen.screenId, nextMenu.menuId) fragmentManager.saveBackStack(currentMenu.menuId.toString()) fragmentManager.replace(nextMenu.menuId, startScreen.clazz) } else -> { stack.moveToTop(nextMenu.menuId) fragmentManager.saveBackStack(currentMenu.menuId.toString()) fragmentManager.restoreBackStack(nextMenu.menuId.toString()) } }

  89. Navigate Switch menu Go Back when { destRecord == null

    && currentMenuId == graph.startMenuId -> { activity.finish() } destRecord == null -> { stack.push(startScreen.screenId, graph.startMenuId) fragmentManager.replace(graph.startMenuId, startScreen.clazz) } destRecord.menuId == currentMenuId -> { stack.pop() fragmentManager.popBackStack() } else -> { stack.pop() fragmentManager.popBackStack() fragmentManager.restoreBackStack(destRecord.menuId.toString()) } }

  90. Go Back case 1: can’t back at default menu when

    { destRecord == null && currentMenuId == graph.startMenuId -> { activity.finish() } destRecord == null -> { stack.push(startScreen.screenId, graph.startMenuId) fragmentManager.replace(graph.startMenuId, startScreen.clazz) } destRecord.menuId == currentMenuId -> { stack.pop() fragmentManager.popBackStack() } else -> { stack.pop() fragmentManager.popBackStack() fragmentManager.restoreBackStack(destRecord.menuId.toString()) } }

  91. Go Back case 2: can’t back at not default menu

    when { destRecord == null && currentMenuId == graph.startMenuId -> { activity.finish() } destRecord == null -> { stack.push(startScreen.screenId, graph.startMenuId) fragmentManager.replace(graph.startMenuId, startScreen.clazz) } destRecord.menuId == currentMenuId -> { stack.pop() fragmentManager.popBackStack() } else -> { stack.pop() fragmentManager.popBackStack() fragmentManager.restoreBackStack(destRecord.menuId.toString()) } }

  92. Go Back case 3: navigate back inside the same menu

    when { destRecord == null && currentMenuId == graph.startMenuId -> { activity.finish() } destRecord == null -> { stack.push(startScreen.screenId, graph.startMenuId) fragmentManager.replace(graph.startMenuId, startScreen.clazz) } destRecord.menuId == currentMenuId -> { stack.pop() fragmentManager.popBackStack() } else -> { stack.pop() fragmentManager.popBackStack() fragmentManager.restoreBackStack(destRecord.menuId.toString()) } }

  93. Go Back case 4: navigate back across menus when {

    destRecord == null && currentMenuId == graph.startMenuId -> { activity.finish() } destRecord == null -> { stack.push(startScreen.screenId, graph.startMenuId) fragmentManager.replace(graph.startMenuId, startScreen.clazz) } destRecord.menuId == currentMenuId -> { stack.pop() fragmentManager.popBackStack() } else -> { stack.pop() fragmentManager.popBackStack() fragmentManager.restoreBackStack(destRecord.menuId.toString()) } }

  94. in Summary: - Fragment supports Multiple Backstack - BottomNavigationView works

    weirdly - You can make it by yourself - I don’t want to make it

  95. in Summary: - Fragment supports Multiple Backstack - BottomNavigationView works

    weirdly - You can make it by yourself - I don’t want to make it

  96. in Summary: - Fragment supports Multiple Backstack - BottomNavigationView works

    weirdly - You can make it by yourself - I don’t want to make it

  97. in Summary: - Fragment supports Multiple Backstack - BottomNavigationView works

    weirdly - You can make it by yourself - I don’t want to make it

  98. in Summary: - Fragment supports Multiple Backstack - BottomNavigationView works

    weirdly - You can make it by yourself - I don’t want to make it

  99. Hiroyuki Mori @moridroid Thank you