Video: ViewModelProviders yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
ViewModelProviders (tseem yog Maven artifact android. arch. lifecycle:extensions) yog ib chav kawm los ntawm android. arch. lifecycle pob uas muaj cov txheej txheem kev siv hluav taws xob rau ViewModelStore chav kawm & xa rov qab koj qhov khoom ntawm ViewModelProvider chav kawm thaum koj siv () txoj kev los ntawm nws.
Ua raws li qhov xav tau, ViewModelProvider Hoobkas yog dab tsi?
ViewModelProvider . Hoobkas uas tuaj yeem tsim ViewModels nkag mus thiab pab txhawb rau lub xeev tau txais kev cawmdim ntawm SavedStateHandle tau txais hauv tus tsim. Hoobkas uas tej zaum yuav tsim AndroidViewModel thiab ViewModel, uas muaj ib tug khoob constructor.
Tsis tas li ntawd, vim li cas peb thiaj xav tau ViewModel Hoobkas? Cov ViewModel chav kawm tso cai rau cov ntaub ntawv kom muaj sia nyob cov kev hloov pauv xws li kev sib hloov ntawm lub vijtsam. ViewModel yog ib qho kev pom zoo Android Architecture Cheebtsam. ViewModelProvider. Hoobkas yog ib qho interface koj siv tau los tsim ib ViewModel khoom.
Tom qab ntawd, lo lus nug yog, Viewmodelfactory yog dab tsi?
Cov ntsiab lus luv luv ntawm Android Architecture Cheebtsam ViewModel khaws cov ntaub ntawv ntsig txog UI uas tsis raug rhuav tshem ntawm kev sib hloov app. Nws ceeb toom rau cov neeg soj ntsuam thaum cov ntaub ntawv hloov pauv kom koj tuaj yeem hloov kho UI. Nws kuj yog lifecycle paub. Chav tsev yog lub tsev qiv ntawv SQLite cov khoom siv ua haujlwm zoo.
Mvvm Android yog dab tsi?
Model-View-ViewModel (ie MVVM ) yog ib qho qauv ntawm cov neeg siv khoom siv architecture, npaj los ntawm John Gossman ua lwm txoj hauv kev rau MVC thiab MVP cov qauv thaum siv cov ntaub ntawv Binding technology. Nws lub tswv yim yog cais cov ntaub ntawv kev nthuav qhia logic los ntawm kev lag luam logic los ntawm kev txav mus rau hauv cov chav kawm tshwj xeeb kom muaj qhov sib txawv.
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