❮
[AndroidX] Data Binding - 1
[AndroidX] Data Binding - 1
데이터와 뷰를 묶어줌.
참조
코드랩- (findByView()를 사용하는 것보다 코드 길이 짧아짐. 가독성 향상. 유지하기 쉬운 코드.)
- 데이터와 뷰가 완전히 분리된다.
- Android 시스템이 뷰를 얻기 위해서 뷰 계층을 한 번만 순회하게 된다. 이 작업은 런타임이 아니라 앱 시작 시점에 일어난다.
- 뷰들을 타입에 안전하게 얻을 수 있다.
사용
1. gradle 수정
build.gradle(Module:app) 에 들어가서android
{
...
databinding{
enabled = true
}
...
}2. layout xml 수정
이제 layout xml 로 가서 최상위 layout 태그에 커서를 올려놓고 alt + enter 를 누르면 아래 그림처럼 Convert to data binding layout이 나온다.
이 시점에서 Clean Project - Rebuild project 해주는게 좋다.
3. binding 변수 만들기.
이제 binding 객체를 만들어주어야 한다.액티비티에서
onCreate() 안에프래그먼트에서
onCreate() 안에4. findView 대체하기
이제 xml 에서 정의했던 모든 뷰들을 바로 호출 가능하다. id_view 형태로 만들었다면 idView로 호출 가능하다.apply를 이용해서 간단히 할 수 있다.
.
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