Youtube like BottomNavigation - Speaker Deck

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Hiroyuki Mori @moridroid BottomNavigationView for humankind

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↓This

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making a new app

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making a new app - multi-module project

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

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making a new app - multi-module project - Jetpack Navigation - BottomNavigationView

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making a new app - multi-module project - Jetpack Navigation - BottomNavigationView →

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making a new app - multi-module project - Jetpack Navigation - BottomNavigationView →

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No support for Multiple Backstack

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https://bit.ly/3wXjGLy

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Click

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Click

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Click QUIZ： When the Home menu is clicked, which screen is displayed? 1. Welcome 2. About

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No content

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disappear go down

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No!

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

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Just update dependencies

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This isn’t nice

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Click

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Click

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Click

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No content

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This isn’t nice

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This isn’t nice

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QUIZ： If you click the back key, which screen is displayed? 1. Welcome 2. About Click

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QUIZ： If you click the back key, which screen is displayed? 1. Welcome 2. About Click ？

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QUIZ： If you click the back key, which screen is displayed? 1. Welcome 2. About Click ✕

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No content

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Click

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How Multiple backstack works

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Backstack　　 SavedState　　

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Backstack　　 SavedState　　 Click

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Backstack　　 SavedState　　 menu A　 Save Backstack　　 SavedState　　 Click

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Backstack　　 SavedState　　 menu A　 Click

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Backstack　　 SavedState　　 menu B　 menu A　 Restore Save Click

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Backstack　　 SavedState　　 menu A　 menu B　 ← When the back key is pressed ← Can’t decide 　which should be restored

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

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Backstack　　 SavedState　　 menu A　 menu B　 menu A　 menu B　 Click

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menu B　 menu A　 Backstack　　 SavedState　　 menu B　 Backstack　　 SavedState　　

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graph A1 B1 C1 D1 B2 B3 C2 C3 D2 D3 C4 C5

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graph A1 B1 C1 D1 B2 B3 C2 C3 D2 D3 C4 C5

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graph A1 B1 C1 D1 B2 B3 C2 C3 D2 D3 C4 C5

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graph A1 B1 C1 D1 B2 B3 C2 C3 D2 D3 C4 C5

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graph A1 B1 C1 D1 B2 B3 C2 C3 D2 D3 C4 C5

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graph A1 B1 C1 D1 B2 B3 C2 C3 D2 D3 C4 C5

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What the ideal Bottom Navigation should be

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C1

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C1 C2

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C1 C2 C3

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C1 C2 C3 D1 Click menu D

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C1 C2 C3 D1 D2 Click menu D

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C1 C2 C3 D1 D2 Click menu D Click menu C

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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

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How to implement Backstack management

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https://bit.ly/3zdDxrn

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First of all: Reorderable Stack

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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 { ... } fun moveToTop(menuId: Int) { ... } fun removeAll(menuId: Int) { ... } }

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● Navigate ● Switch menu ● Go Back

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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) }

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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) }

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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

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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) }

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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) }

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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()) }

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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()) }

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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

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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

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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

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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

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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()) } }

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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()) } }

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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()) } }

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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()) } }

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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()) } }

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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()) } }

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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()) } }

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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()) } }

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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()) } }

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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()) } }

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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()) } }

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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()) } }

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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()) } }

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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()) } }

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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()) } }

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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()) } }

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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()) } }

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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()) } }

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in Summary: - Fragment supports Multiple Backstack - BottomNavigationView works weirdly - You can make it by yourself - I don’t want to make it

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in Summary: - Fragment supports Multiple Backstack - BottomNavigationView works weirdly - You can make it by yourself - I don’t want to make it

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in Summary: - Fragment supports Multiple Backstack - BottomNavigationView works weirdly - You can make it by yourself - I don’t want to make it

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in Summary: - Fragment supports Multiple Backstack - BottomNavigationView works weirdly - You can make it by yourself - I don’t want to make it

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in Summary: - Fragment supports Multiple Backstack - BottomNavigationView works weirdly - You can make it by yourself - I don’t want to make it

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Hiroyuki Mori @moridroid Thank you