AndroidXに潜む便利なヤツら

Transcript

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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