U and I
summary
Practical rules and code: use shared-element transitions and PathInterpolator and ArcMotion for curved motions, prefer drawables for window backgrounds, and use ObjectAnimator or TransitionManager to animate positions; test timings (fast = small/light, slow = far/heavy) and avoid sprinkling secondary motion. Color claim: do all color math in linear space — decode sRGB (≈2.2), do blending/averages in linear, then re-encode; this saves you from needing ~12 bits per channel (8-bit works with gamma). A small demo toolkit is slated to publish toolkit UI demos on GitHub and the examples run (screen-record stutter aside).
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