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AndroidXʹજΉศརͦ͏ͳϠπΒ @takuji31 Mobile Act KYOTO #1

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ࣗݾ঺հ

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ࣗݾ঺հ • @takuji31 id:takuji31 • Takuji Nishibayashi • Hatena Co., Ltd. • App Team • ίϛοΫDAYS • δϟϯϓϧʔΩʔʂ • ΧΫϤϜ

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ࣗݾ঺հ • Android • Kotlin • Flu-er • ! h-ps:/ /blog.takuji31.jp • " h-ps:/ /nazuna.takuji31.jp • # $ h-ps:/ /photo.takuji31.jp

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AndroidX

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LiveData? ViewModel? AppCompat? Naviga5on

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࢖ͬͯ·͢ΑͶ

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ศརͳ΍ͭ৭ʑ঺հ͠·͢

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α൛ͷ΋ͷ΋ؚ·ΕΔͷͰ ͝ར༻͸ܭըతʹ

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ଞʹ΋͍͍΋ͷ͋ͬͨΒ ڭ͍͑ͯͩ͘͞ʂ

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androidx.ac*vity androidx.fragment

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ComponentActivity.viewModels{} Fragment.viewModels{} Fragment.activityViewModels{}

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ViewModelΛऔಘͰ͖Δ Delegated property

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viewModels ͸Ҿ਺Ͱ ViewModelStoreOwnerΛ୳͢ blockΛ౉ͤΔ

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valʹͰ͖Δ

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Goodbye! private lateinit var

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@ContentView

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ComponentAc*vity ͱ Fragmentʹ secondory constructor͕௥Ճ

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constructorͷҾ਺ʹLayoutͷIDΛ ౉ͤΔ

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Goodbye setContentView()

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DataBinding͸bind͢Ε͹Αͦ͞͏

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androidx.lifecycle

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ViewModelͱ͔LiveDataͱ͔ೖͬͯ ΔΞϨ

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ViewModel.viewModelScope

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ViewModelͷCorou,neScope

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Context͸ Dispatchers.Main + Job

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onCleared() ͰΩϟϯηϧ

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Saved State

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ViewModel͸ը໘ճసΛੜ͖࢒Δ

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Ac#vity͕ϝϞϦʔ͔Β ഁغ͞ΕΔ࣌͸ࢮ͵

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SavedStateHandler Ͱঢ়ଶΛ෮ݩͰ͖Δ

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γϯϓϧͳ set/get/remove/contains

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getLiveData()

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see. h&ps:/ /developer.android.com/ topic/libraries/architecture/ viewmodel-savedstate

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androidx.navigation

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Naviga&onͷΞϨ

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androidx.navigation.safeargs androidx.navigation.safeargs.kotlin

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Naviga&onͷxmlʹఆٛͨ͠ભҠઌ ͷargsΛࣗಈੜ੒

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Kotlinίʔυੜ੒Մೳ

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Goodbye createIntent() methods!

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Naviga&onͰը໘ભҠ͠ͳͯ͘΋࢖ ͑Δ

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·ͣ͸࢖ͬͯΈͯʂ

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Fragment.navGraphViewModels()

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ࢦఆͨ͠Naviga&onͷgraphͰੜ͖ ࢒ΔFragment

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NavHostFragment಺ͷFragment಺ Ͱ࢖͏ɺΈ͍ͨͳײ͡ͷ࣌ʹ࢖͑ͦ ͏

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͜Εॻ͍ͯͯࠓ࣮૷ͯ͠Δը໘Ͱ࢖ ͑ͦ͏ͱࢥͬͨͷͰ࢖͏༧ఆ

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h"ps:/ /developer.android.com/ jetpack/androidx