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Android: hardware step-counter bridge for step-sync mods

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love.system.syncHealthSteps() now exists on Android, matching the iOS
Health bridge merged in #452 and using the same JNI route as the SAF
picker (wrap_System.cpp -> System.cpp -> common/android.cpp ->
GameActivity over JNI):

- GameActivity.syncHealthSteps: one-shot read of the hardware
  TYPE_STEP_COUNTER sensor (cumulative since boot, counted by the OS
  whether or not any app runs). The reading is anchored in
  SharedPreferences so a walk is never credited twice; a reading below
  the anchor means the phone rebooted, which re-anchors without
  crediting. Deltas (50k clamp) merge into steps_pending.json in the
  save identity dir - the same contract as the iOS GRHealthBridge, so
  the Pokewalker mod works unchanged on both platforms.
- ACTIVITY_RECOGNITION declared in the app manifest (Android 10+
  runtime prompt on first sync; granted -> the sensor read runs
  immediately via onRequestPermissionsResult). The build script's
  permission trim leaves it alone.
- Nothing in the base game calls the new seam; without a consumer mod
  the only cost is one dormant manifest permission.
- build_android.sh: shadow-build from a space-free temp dir when the
  checkout path contains spaces - ndk-build is GNU make underneath and
  cannot cope with paths like "xCode Projects".
- mobile/ANDROID.md: step-bridge dev notes.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Myles Resnick
2026-07-30 15:58:13 -04:00
parent 97e3fb296c
commit caa65182dc
9 changed files with 282 additions and 3 deletions
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mobile/android/app/src/main/AndroidManifest.xml
+5
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@@ -8,6 +8,11 @@
the link screen shows as "(Operation not permitted)" (issue #287).
scripts/build_android.sh must not strip this again. -->
<uses-permission android:name="android.permission.INTERNET" />
<!-- Step bridge: love.system.syncHealthSteps reads the hardware step
counter, which Android 10+ gates behind this runtime permission.
Requested only on the first sync call (the Pokéwalker mod's SYNC
STEPS option); scripts/build_android.sh must not strip it. -->
<uses-permission android:name="android.permission.ACTIVITY_RECOGNITION" />
<!-- OpenGL ES 2.0 -->
<uses-feature android:glEsVersion="0x00020000" />
<!-- Touchscreen support -->