A workout keeps its cadence as a series of its own (steps a minute, every
10 s while moving). The Record sheet offers Music, Metronome or Off on
foot, remembered; Music once a kept track has a tempo. The recorder
measures the cadence over the last 30 s and plays a fitting track (its
tempo, half or double, within 6 %) through Media3's ExoPlayer, retuning
the track playing where it still fits, else crossfading over 3 s; a
plan's new step picks anew. A run starts at the cadence learnt from the
person's runs, which also gives a plan's steps their cadence.
Media3 1.10.1, pinned by Gradle's checksums (trusted on first download
from Google's Maven, 29 Oct 2026), for review:
media3-common aar 39686f54ff6baf8cbc841199afd55619533eaef2ab6cd0efc32b8a3c55dd88c3
module a81b2f0ebc256fe0e09f05d93c5259ade5bf44707748b9295343bee67575d9c2
media3-container aar a198b62c577fa434941282fbfa31eb66ff0ff308a6573edf0b5dd01f4e38445d
module e2a1c62c7e5d1013b906bc6ff5056db3e797cda4505e2d7d229524b24ca67a0e
media3-database aar 520e6f814e42a7d428db187ac073b453c0fcba0f4f5f4edd1cf33fafd2cfb740
module c380fea161e80d8074215a20e86e3dc2c2d825de964ca87aee66c8331f5ae252
media3-datasource aar e22f9f779047ce951152c793af094593e7cbb52475a82d56fa4f869fd319e700
module 9d32d2ec6a983ee9f418bcc05777aa23eee4db37bf794f44fb66a05d6f22e963
media3-decoder aar a9fb2b8fa1d54b4a8d6bda98a1c655b04d59c74b3ace7e2503e9e39830f13aee
module 388d5226366edd1facf8eec42cb5420871a46032d545286e90eaea8454789580
media3-exoplayer aar 19090f829afbbb595d67618f59c212f72b433ac01dc72b47594cf42552c8ed61
module ba0b9ef325fa114baa0f2fbdb4caf54029606924be1999f4af02bed5f079756b
media3-extractor aar 3c823279356b64f4215a8c6cb1e6bfa60c533351a651786ad6fa69ad001ef1b1
module b3eb755d7373e4fd199ff80814005f3b303693dfb8ace16b5b9482655d49d493
Not tried on a phone yet.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>
On Android, the Loop through Polar's BLE SDK 8.3.0 (from JitPack, asked
for Polar's group alone, its files pinned by SHA-256 in Gradle's
verification metadata): LoopBridge.kt over app.halkyon.train/loop, the
first-time use's figures mapped and checked in LoopSetup.kt, tested on
the JVM. PolarLoop per person remembers the band in loop.json, connects
while the app is open, sets its clock at each connection, keeps what it
tells (battery, charging, firmware), offers a changed profile and sends
it only when asked (D35: first-time use writes a new user identifier
each time), and lets the band go by a factory reset after asking. The
setup sheet finds Loops nearest first and asks only for what the
profile lacks; Polar's defaults (60, 220 less the age, a VO2max from
Polar's fitness tables) go to the band alone.
Polar's SDK is not free software (D36, correcting D32): the app's AGPL
gains a section 7 permission for linking it, LICENSE.md names it, and
its licence and bundled notices join the licence list on Android.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>
