feat(android): implement native haptics engine#3
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Android was a stub; this implements the Tickle Nitro spec on top of Vibrator/VibrationEffect. iOS remains the primary (Core Haptics) target, and Android is an approximation: - intensity -> vibration amplitude (API 26+ amplitude control; degrades to on/off timing on devices without it) - sharpness -> composition primitives on API 30+ (crisp CLICK/TICK vs dull THUD) for transient patterns and system haptics; ignored on the continuous/waveform path, which has no primitive equivalent - continuous players re-issue short, throttled amplitude ramps to mask the actuator-brake seams Android imposes when an effect is superseded - custom patterns render events + intensity curves into a sampled, run-length-encoded amplitude waveform - system haptics (impact/notification/selection) map to composition primitives with predefined/one-shot fallbacks on older devices - persists the global enable flag in SharedPreferences Declares the VIBRATE permission and documents the Android approximations in the README. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Summary
Android was a stub — this implements the Tickle Nitro spec on top of
Vibrator/VibrationEffect. iOS remains the primary Core Haptics target;Android is a documented approximation.
intensity→ vibration amplitude (API 26+; degrades to on/off timing without amplitude control)sharpness→ composition primitives on API 30+ (crisp CLICK/TICK vs dull THUD) for transientpatterns and system haptics; ignored on the continuous/waveform path
Android imposes when an effect is superseded
VIBRATEpermission; README documents the approximationsTesting
Built and manually tested on a physical Pixel 7a (Android 16): transient sharpness,
system-haptic styles, notification sequences, and continuous-intensity drags.
Notes