AAC ViewModel + AAC LiveData

세션 노트

AAC ViewModel

Info

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https://developer.android.com/topic/libraries/architecture/saving-states

Info

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https://developer.android.com/topic/libraries/architecture/viewmodel?gclid=Cj0KCQjw-_j1BRDkARIsAJcfmTHyZxwxNwarOLcTxrKqa-Iy3WP8SCnC_K5NgaQegDDBaODQ5-9GUZEaAslvEALw_wcB&gclsrc=aw.ds

Info

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https://medium.com/androiddevelopers/livedata-with-snackbar-navigation-and-other-events-the-singleliveevent-case-ac2622673150

추가 자료

🤔 What is AAC

AAC : Android Architecture Component

manage Application lifecycle

• detect component changes
• prevent memory leak
• load data on UI

LiveData

notify data changes on database to view

ViewModel

store UI states even

Room

SQLite object mapping library

• Use it to avoid boilerplate code and easily convert SQLite table data to Java objects.
• Room provides compile time checks of SQLite statements and can return RxJava, Flowable and LiveData observables.

Lifecycle

Best Practice

UI controller: activity, fragment … → should not acquire their own data → data should be on ViewModel

Use Kotlin coroutines

Usage

• Video play
• Network connection
• animation play
• GPS

View Binding

alternative to findViewById(<!—id—>)

• Null safe
• Type safe

vs data binding

→ data binding은 <layout>안에 생성된 데이터 바인딩 레이아웃만 처리한다. → @+id 만 있으면 모든 view 참조/binding 가능