The Curious Case of Android Gesture Animation
summary
Implements a stretchy, sticky square that snaps to top or bottom using ViewDragHelper with clampViewPositionVertical and settleCapturedViewAt for smooth settling; Android drag‑and‑drop is rejected because it only shows a drag shadow. Uses spring/dynamic animations (androidx.core.animation or ObjectAnimator/AnimatorSet) to restore scale, y offset and a stretch factor; Jetpack Compose version uses rememberDraggableState, draggable modifier and updateTransition and cuts the imperative touch plumbing to about five lines while preserving the bounce and fixing flicker.
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chapters (14)
- 0:00Introduction and overview
- 1:51Stretchable square setup
- 2:56Android drag and drop framework
- 5:02View drag helper implementation
- 7:12Jetpack Compose dragable basics
- 8:17Smooth settling with settle capture
- 9:19Making the square stretchable
- 10:21Stuck and unstuck states
- 12:28Flipping and dynamic animation
- 13:32Fixing flip at bottom
- 14:14Dynamic animation basics
- 15:16Spring animation for bounce
- 16:20Jetpack Compose update transition
- 18:55Comparison and summary
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