original source : https://youtu.be/lMMZwkLWi7o

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CENTER_CROP을 가장 많이 사용하며 최초이미지가 크면 가운데를 기준으로 꽉찬 상태를 유지하며 줄인거나 꽉찬 상태를 유지하며 늘린다.

CENTER_INSIDE 최초이미지가 크면 가운데를 기준으로 줄이면서

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orginal source : https://youtu.be/yaeBev0uQvQ

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original source : https://youtu.be/hODuluSJZ0I

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original source : https://youtu.be/7ep4effngGc

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material design이 도입되면서 제공되는 새로운 widgets의 예를 보여주고 있다. 

 AppBarLayout 부터 TextInputLayout까지 모두 새로운 widgets에 해당한다.

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drawer layout 과 navigation view , navigation drawer 비교

https://stackoverflow.com/questions/44176576/navigation-drawer-vs-navigation-view-which-is-best-and-what-is-the-diffrence

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NavigationView를 DrawerLayout과 함께 사용한 방법을 아래서 보여주고 있다.

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AppBarLayout과 CollapsingToolbarLayout
참고) 실제 예시
https://youtu.be/wCuM_di5M9Y?t=50

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android studio 에서 blank activity template을 선택하는 경우 기본적으로 material design widgets이 어느 정도 설정되어서 시작된다.

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