ReactiveX, Android 기본, Android Camera 관련 기본 문서 링크 모음

ReactiveX
개요 : http://reactivex.io/intro.html (영문)
Observable : http://reactivex.io/documentation/ko/observable.html
Operators : http://reactivex.io/documentation/ko/operators.html
Single : http://reactivex.io/documentation/ko/single.html
Subject : http://reactivex.io/documentation/ko/subject.html
Scheduler : http://reactivex.io/documentation/ko/scheduler.html

Android 기본
앱 아키텍처 가이드 : https://developer.android.com/jetpack/docs/guide
수명주기 인식 구성요소로 수명 주기 처리 : https://developer.android.com/topic/libraries/architecture/lifecycle
LiveData 개요 : https://developer.android.com/topic/libraries/architecture/livedata
ViewModel 개요 : https://developer.android.com/topic/libraries/architecture/viewmodel

Android Camera 관련 문서
사진 촬영 : https://developer.android.com/training/camera/photobasics
동영상 녹화 : https://developer.android.com/training/camera/videobasics
카메라 제어 : https://developer.android.com/training/camera/cameradirect
카메라 API : https://developer.android.com/guide/topics/media/camera