Android Hilt jetpack It coroutin viewlifecycle fragment view compose기초 베스트소설 sealedclass 이민진 listadapter switchMap 파친코 UITest ViewModel compose FlatMap Kotlin RxJava unittest CLEAN RecyclerView this architecture Adapter Fragment 기초 thread 책리뷰 abstract private 장편소설 interface enum Process test 리뷰 안드로이드