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AndroidXに潜む便利なヤツら
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Takuji Nishibayashi
April 19, 2019
Technology
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AndroidXに潜む便利なヤツら
Takuji Nishibayashi
April 19, 2019
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Transcript
AndroidXʹજΉศརͦ͏ͳϠπΒ @takuji31 Mobile Act KYOTO #1
ࣗݾհ
ࣗݾհ • @takuji31 id:takuji31 • Takuji Nishibayashi • Hatena Co.,
Ltd. • App Team • ίϛοΫDAYS • δϟϯϓϧʔΩʔʂ • ΧΫϤϜ
ࣗݾհ • Android • Kotlin • Flu-er • ! h-ps:/
/blog.takuji31.jp • " h-ps:/ /nazuna.takuji31.jp • # $ h-ps:/ /photo.takuji31.jp
AndroidX
LiveData? ViewModel? AppCompat? Naviga5on
ͬͯ·͢ΑͶ
ศརͳͭ৭ʑհ͠·͢
α൛ͷͷؚ·ΕΔͷͰ ͝ར༻ܭըతʹ
ଞʹ͍͍ͷ͋ͬͨΒ ڭ͍͑ͯͩ͘͞ʂ
androidx.ac*vity androidx.fragment
ComponentActivity.viewModels{} Fragment.viewModels{} Fragment.activityViewModels{}
ViewModelΛऔಘͰ͖Δ Delegated property
viewModels ҾͰ ViewModelStoreOwnerΛ୳͢ blockΛͤΔ
valʹͰ͖Δ
Goodbye! private lateinit var
@ContentView
ComponentAc*vity ͱ Fragmentʹ secondory constructor͕Ճ
constructorͷҾʹLayoutͷIDΛ ͤΔ
Goodbye setContentView()
DataBindingbind͢ΕΑͦ͞͏
androidx.lifecycle
ViewModelͱ͔LiveDataͱ͔ೖͬͯ ΔΞϨ
ViewModel.viewModelScope
ViewModelͷCorou,neScope
Context Dispatchers.Main + Job
onCleared() ͰΩϟϯηϧ
Saved State
ViewModelը໘ճసΛੜ͖Δ
Ac#vity͕ϝϞϦʔ͔Β ഁغ͞ΕΔ࣌ࢮ͵
SavedStateHandler Ͱঢ়ଶΛ෮ݩͰ͖Δ
γϯϓϧͳ set/get/remove/contains
getLiveData()
see. h&ps:/ /developer.android.com/ topic/libraries/architecture/ viewmodel-savedstate
androidx.navigation
Naviga&onͷΞϨ
androidx.navigation.safeargs androidx.navigation.safeargs.kotlin
Naviga&onͷxmlʹఆٛͨ͠ભҠઌ ͷargsΛࣗಈੜ
KotlinίʔυੜՄೳ
Goodbye createIntent() methods!
Naviga&onͰը໘ભҠ͠ͳͯ͘ ͑Δ
·ͣͬͯΈͯʂ
Fragment.navGraphViewModels()
ࢦఆͨ͠Naviga&onͷgraphͰੜ͖ ΔFragment
NavHostFragmentͷFragment Ͱ͏ɺΈ͍ͨͳײ͡ͷ࣌ʹ͑ͦ ͏
͜Εॻ͍ͯͯࠓ࣮ͯ͠Δը໘Ͱ ͑ͦ͏ͱࢥͬͨͷͰ͏༧ఆ
h"ps:/ /developer.android.com/ jetpack/androidx