RecyclerView’s Powerful Companions
summary
Three concrete APIs: DiffUtil computes precise insert remove move/change operations (detectMoves is true by default, can be expensive for huge lists and must run without mutating the backing data), SnapHelper provides paging-like snapping (LinearSnapHelper snaps to center, requires match_parent sizing for correct behavior), and ItemTouchHelper implements drag, swipe, startDrag/startSwipe, thresholds and drop hooks while requiring the adapter to be updated; using DiffUtil across lists reduces boilerplate and works reliably.
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chapters (24)
- 0:00Intro
- 3:40Structural Changes
- 5:30Diffutil API
- 6:04Items
- 7:29Content Graph
- 8:11Calculate Diff
- 9:00Dispatch Diff
- 9:59Order of Operations
- 11:05UI Thread
- 12:49Snap Helper
- 13:46Linear Snap Helper
- 14:16Pagers Snap Helper
- 15:16Item Touch Listener
- 16:06Item Touch Helper
- 16:25Make Movement Flags
- 16:59Update Adapter
- 17:26Longpressing
- 18:14CanDrag
- 18:51Swipe
- 19:15Start Swipe
- 19:43Attach State
- 20:15Velocity
- 20:46ItemTouchHelper
- 22:29Outro
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