Android UIs dibangun saka Views (UI widgets kaya tombol, teks) sing disusun dening ViewGroups/layouts (kontainer kaya LinearLayout, ConstraintLayout). Tradisional ditetepake ing XML layouts, Android modern saya-saya luwih akeh nggunakake Jetpack Compose (deklaratif). Ngerteni sistem view iku dhasar kanggo nggawe UIs.
Views lan ViewGroups
VIEW → a single UI element (TextView, Button, ImageView, EditText, etc.)
VIEWGROUP → a container that holds/arranges child views (LinearLayout, ConstraintLayout,
FrameLayout, RecyclerView, etc.) — layouts ARE ViewGroups
→ UIs are a TREE of views inside view groups (composition).
