Android Architecture Componentͷ NavigationͰগ͠͸·ͬͨ࿩ 

ࣗݾ঺հ — ٠஑/bigbackboom — CBcloudגࣜձࣾɹ 

Navigationͱ͸ʁ — Google I/O 2018Ͱൃද͞ΕͨAndroid Architecture ComponentͷҰͭ — FragmentؒͷભҠΛϘτϜφϏͳͲͰߦ͏ͳͲෳࡶͳཁ݅ ͷͨΊʹ։ൃ͞Εͨɻ — backstackͷ؅ཧ͕೉͍͠ — fragmentࣗମͷlifecycle͕ෳࡶ — ݟͨ໨͸iOSͷstoryboardͳͲʹ͍͕ۙɺ࢖༻ൣғ͸͍ͩ 

ͳͥϘτϜφϏͰNavigationΛ࢖͏ඞཁ͕͋Δʁ — Α͘࢖ΘΕ͍ͯͨɺViewPager+BottomNavigationView͸ ׂͱ࣮૷͕ෳࡶʢ࡞Δύʔπ͕ଟ͍ʣɻ — ViewPager͸ը໘ͷΩϟογϡॲཧ͕ಈ͘ͷͰɿ — ෳ਺ը໘͕ಉ࣌ʹಡΈࠐ·Εɺىಈ͕஗͘ͳΔ — Ωϟογϡ਺ʹΑͬͯ͸ɺը໘͕ഁغ͞Εબ୒࣌ʹҰ͔ ΒಡΈࠐ·ΕΔɻ 

BottomNavigationView + NavigationΛ࣮૷ — ͜ͷrepositoryΛϕʔεʹ࢖Θ ͤͯ΋Β͍·ͨ͠ɻ — ߏ଄͸ӈͷը૾ͷΑ͏ʹͳ͍ͬͯ ·͢ɻ 

λϒຖͷঢ়ଶҡ࣋ — Կ΋͠ͳ͍ͱɺ DashboardFragmentͱ NotificationsFragment͸λϒ͕ બ୒͞ΕΔͨͼʹॳظԽ͞ΕΔ — ͦΕΛආ͚ΔͨΊʹ͸ɺ BottomNavigationViewͱ Fragmentͷੜ੒Λ஥հ͢Δɺ FragmentNavigatorΛࣗ࡞͢Δ ඞཁ͕͋Δɻ 

— ࢀߟrepositoryͰ͸ KeepStateNavigatorͱ͍͏΋ͷ Λ࡞͍ͬͯΔɻ — ·ͨɺBottomNavigationViewͱ Fragmentͷؔ܎Λఆٛͨ͠ɺ nav_graph.xmlͰ KeepStateNavigatorΛ࢖༻ͯ͠ ͍Δ 

ͰɾɾɾԿʹ͸·ͬͨͷʁ — Activity͔ΒFragmentʹ஋Λ౉͢͜ͱ͕Ͱ͖ͳ͍ɾɾɾ — ௨ৗͰ͋Ε͹,ԼهͷΑ͏ʹ͢Ε͹஋Λϑϥάϝϯτʹ౉ͤ Δɻ val bundle = Bundle().apply { putString("NOTIFICATION_KEY", "bigbacbkboom is here") } NavController.navigate(item.itemId, bundle) 

͕͔ͩ͠͠ɾɾɾ 

null ͩͱɾɾɾ 

ద౰ʹ౰ͨΓΛ͚ͭΔ 

KeepStateNavigator಺෦ͰσόοΨͰࢭΊͯΈΔ — Έ͚ͬͽΐΜ 

KeepStateNavigator.kt ίʔυΛमਖ਼ ҎԼͷߦΛҰͭ௥Ճ͢Δ͚ͩɻ var fragment = manager.findFragmentByTag(tag) fragment?.arguments = args if (fragment == null) { val className = destination.className fragment = manager.fragmentFactory.instantiate(context.classLoader, className) transaction.add(containerId, fragment, tag) } else { transaction.attach(fragment) } 

मਖ਼಺༰͸ʁ — fragmentΛੜ੒͢Δͱ͖ʹɺBundleΛ౉ͯ͋͛͠ΔॲཧΛ ॻ͚͹͍͍ͱ͍͏ࢸۃ୯७ͳ΋ͷͰ͢ɻ — ͨͩɺਓͷίʔυΛૉ௚ʹίϐʔͯͨ͠ͷͰɺ΍͸Γ͜Ε ʹؾ͕ͭ͘ͷʹۤ࿑͠·ͨ͠ɻ 

݁࿦ — Navigation͸ViewPage+BottomNavigationViewrΑΓ΋ ύʔπ਺͕গͳָ͘ɻ — ͲΜͳ͜ͱ΋ಉ͡Ͱ͕͢ɺ΍͸ΓͲΜͳ͜ͱ΋ͪΌΜͱཧ ղ͠ͳ͍ͱ௧͍໨ΛݟΔɻ 

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